WO2014117727A1 - 一种媒体转移的方法、装置及系统 - Google Patents

一种媒体转移的方法、装置及系统 Download PDF

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Publication number
WO2014117727A1
WO2014117727A1 PCT/CN2014/071646 CN2014071646W WO2014117727A1 WO 2014117727 A1 WO2014117727 A1 WO 2014117727A1 CN 2014071646 W CN2014071646 W CN 2014071646W WO 2014117727 A1 WO2014117727 A1 WO 2014117727A1
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WO
WIPO (PCT)
Prior art keywords
media
transfer
description information
information
address
Prior art date
Application number
PCT/CN2014/071646
Other languages
English (en)
French (fr)
Inventor
张亚军
朱萸
何智勤
Original Assignee
华为终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Publication of WO2014117727A1 publication Critical patent/WO2014117727A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/756—Media network packet handling adapting media to device capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2385—Channel allocation; Bandwidth allocation

Definitions

  • the present invention claims the priority of the Chinese Patent Application No. 201310042705.5, filed on Feb. 4, 2013, the entire disclosure of which is hereby incorporated by reference.
  • TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for media transfer.
  • IP Internet Protocol
  • IETF Internet Engineering Task Force
  • SIP Session Initiation Protocol
  • media sessions based on the SIP protocol can implement call forwarding services.
  • the SIP UA (User Agent) initiates a registration message to the registration server.
  • the message is modified after passing the ALG (Application Layer Gateway), and the WAN (Wide Area Network) IP address is added.
  • the registration message establishes an address mapping relationship.
  • the Refer to field in the Refer request message carries the URL of the transfer recipient ( Uniform / Universal Resource Locator, Uniform Resource Locator).
  • the calling party After receiving the Refer Request message initiated by the called party, the calling party re-initiates a SIP request according to the URL of the Refer to field to establish a new session, thereby implementing the call transfer service.
  • Embodiments of the present invention provide a method, apparatus, and system for media transfer to improve network efficiency.
  • the embodiment of the present invention provides a media transfer method, including: acquiring media description information of a local device; the media description information is used to indicate The communication related information of the device, including: an Internet Protocol IP address, a port number, and a codec capability information of the device, where the local device includes: a media transfer device and at least one first device; the at least one The media description information of the device is matched with the obtained media description information of the remote device, and the transfer receiving device is determined from the at least one first device according to the matching result; the media description information and the device of the media transfer device are Transmitting the media description information of the transfer receiving device to the gateway, so that the gateway updates the address mapping used for communication with the remote device according to the media description information of the media transfer device and the media description information of the transfer receiving device a table, so that the gateway sends the remote device Media information is forwarded to the receiving transfer device.
  • the method further includes: sending media description information of the remote device to the transfer receiving device, so that the transfer receiving device is configured according to the remote end
  • the media description information of the device determines the port number of the receiving port of the remote device, so as to detect whether the received media information is the media information sent by the remote device according to the port number of the receiving port of the remote device.
  • the media description information further includes: a transport protocol and/or a media format.
  • the method before the obtaining the media description information of the local device , the method further includes: receiving the media transfer device to send a service transfer request message, the service transfer request message carries information of a service requested by the media transfer device to transfer; detecting a local network, determining the local device, and acquiring service description information of the local device; The information is the information of the service supported by the device; the service description information is matched with the information of the service that the media transfer device transfers; the obtaining the media description information of the local device includes: acquiring the service description information and the The media transfer device performs the media description information of the local device that matches the information of the transferred service.
  • the obtaining the media description information of the local device includes: acquiring the media description information of the local device by acquiring the media capability message.
  • the sending the media description information of the remote device to the transfer receiving device includes: sending, by using a session setup message, media description information of the remote device to The transfer receiving device.
  • the media description information of the media transfer device and the media description information of the transfer receiving device are sent to the gateway in a sixth possible implementation manner.
  • the method includes: transmitting media description information of the media transfer device and media description information of the transfer receiving device to the gateway by using a session transfer message.
  • the embodiment of the present invention provides a media transfer method, including: receiving media description information of a media transfer device sent by a control point, and media description information of a transfer receiving device; the media description information is used to indicate a device
  • the communication-related information includes: an Internet Protocol IP address, a port number, and a codec capability information of the device; and is updated according to the media description information of the media transfer device and the media description information of the transfer receiving device for communicating with the remote device Address mapping table; receiving media information sent by the remote device; according to the updated address mapping table for communicating with the remote device, the received The media information sent by the remote device is sent to the transfer receiving device.
  • the updating according to the media description information of the media transfer device and the media description information of the transfer receiving device, an address mapping table used for communicating with the remote device
  • the mapping between the IP address of the media transfer device and the port number of the receiving port and the IP address and port number of the public network stored in the address mapping table according to the media description information of the media transfer device Deleting an entry; establishing, according to the media description information of the transfer receiving device, a mapping relationship between the IP address of the transfer receiving device and the port number of the receiving port and the public network IP address and port number, and storing the mapping to the address mapping In the table.
  • the media description information of the media transfer device and the media description information of the transfer receiving device that are sent by the receiving control point include Transmitting, by the session transfer message, the media description information of the media transfer device sent by the control point and the media description information of the transfer receiving device.
  • the media information includes: a data packet header and a data packet body;
  • the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number;
  • the source IP address is an IP address of the remote device; and
  • the source port number is a receiving of the remote device.
  • the sending the media information sent by the remote device to the transfer receiving device comprises: searching for the updated communication with the remote device according to the destination IP address and the destination port number of the data packet header of the media information An address mapping table, determining an IP address of the transfer receiving device and a port number of the receiving port; and the media according to the IP address of the transfer receiving device and the port number of the receiving port Transferring the information transmitted to the receiving apparatus.
  • the media information is sent to the transfer receiving according to the IP address and port number of the transfer receiving device Before the device, the method further includes: modifying a destination IP address and a destination port number of the data packet header of the media information to an IP address of the transfer receiving device and a port number of the receiving port; and the IP address according to the transfer receiving device And receiving The port number of the port, the sending the media information to the transfer receiving device includes: modifying the destination IP address and destination of the data packet header according to the IP address of the transfer receiving device and the port number of the receiving port The media information of the port number is sent to the transfer receiving device.
  • an embodiment of the present invention provides a method for media transfer, including: sending media description information to a control point, so that the control point, after receiving the media description information, The media description information of the obtained remote device is matched, and if the media description information matches the obtained media description information of the remote device, the media description information is sent to the gateway, so that the The gateway updates an address mapping table used for communication with the remote device according to the media description information and media description information of the media transfer device sent by the control point, so that the gateway sends the media information sent by the remote device Forwarding to the transfer receiving device; the media description information is used to indicate communication related information of the device, including: an Internet Protocol IP address, a port number, and codec capability information of the device; Media information of the end device.
  • the method before the receiving the media information that is forwarded by the gateway from the remote device, the method further includes: receiving a media description of the remote device sent by the control point Determining, according to the media description information of the remote device, a port number of the receiving port of the remote device, to detect whether the received media information is the remote device according to the port number of the receiving port of the remote device Media information sent.
  • the receiving the media description information of the remote device sent by the control point includes: receiving, by using a session setup message, the control point sending Media description information of the remote device.
  • the media information includes: a data packet header and a data packet body;
  • the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number;
  • the source IP address is an IP address of the remote device; and the source port number is the remote device a port number of the receiving port;
  • the destination IP address is an IP address of the transfer receiving device;
  • the destination port number is a port number of the receiving port of the transfer receiving device; and the receiving the gateway forwards the
  • the method further includes: detecting a source port number in the data packet header of the media information and a receiving port of the remote device determined according to media description information of the remote device Whether the port number is the same; if the source port number in the data packet header is different from the port number of the receiving port of the remote device, the media information is discarded; if the data packet is detected
  • the sending the media description information to the control point includes: sending a media capability response message to the control point, where the media capability response message carries the media description information.
  • an embodiment of the present invention provides a method for media transfer, including: receiving a media capability message sent by a control point; and sending media description information to a control point, so that the transfer receiving device is determined at the control point. Transmitting the media description information and the media description information of the transfer receiving device to the gateway, so that the gateway updates the remote description and the remote device according to the media description information and the media description information of the transfer receiving device.
  • An address mapping table of the device communication so that the gateway forwards the media information sent by the remote device to the transfer receiving device; the media description information is used to indicate communication related information of the device, including: an Internet protocol of the device IP address, port number, and codec capability information.
  • the method before the sending the media description information to the control point, the method further includes: sending a service transfer request message to the control point, where the service transfer request message carries the media The information of the service that the transfer device requests to transfer.
  • an embodiment of the present invention provides a control point, including: an acquiring unit, configured to acquire media description information of a local device, where the media description information is used to indicate communication related information of the device, including: a protocol IP address, a port number, and a codec capability information, where the local device includes: a media transfer device and at least one first device; and a processing unit, configured to acquire the at least one first device of the acquiring unit
  • the media description information is matched with the obtained media description information of the remote device, and the transfer receiving device is determined from the at least one first device according to the matching result;
  • a unit configured to send media description information of the media transfer device and media description information of the transfer receiving device to a gateway, so that the gateway is configured according to media description information of the media transfer device and the transfer receiving device
  • the media description information updates an address mapping table for communicating with the remote device, such that the gateway forwards media information sent by the remote device to the transfer receiving device.
  • the transceiver unit is further configured to send media description information of the remote device to the transfer receiving device determined by the processing unit, so that the Determining, by the transfer receiving device, the port number of the receiving port of the remote device according to the media description information of the remote device, so as to detect whether the received media information is sent by the remote device according to the port number of the receiving port of the remote device Media information.
  • the method further includes: the transceiver unit is further configured to receive a service transfer request message sent by the media transfer device
  • the service transfer request message carries the information of the service that the media transfer device requests to transfer;
  • the detecting unit is configured to detect the local network, and determine the local device;
  • the acquiring unit is further configured to acquire the detection unit to determine
  • the service description information is that the service description information of the service supported by the device matches the information of the service that the media transfer device performs the transfer;
  • the obtaining unit is specifically configured according to the And matching result of the unit matching, obtaining media description information of the local device that matches the service description information with the information of the service that the media transfer device performs the transfer.
  • the acquiring unit is specifically obtained by acquiring a media capability message. Media description information of the local device.
  • the transceiver unit sends the media description information of the remote device to the transfer receiving device by using a session establishment message.
  • the transceiver unit specifically, by using a session transfer message, the media description information of the media transfer device and the media description information of the transfer receiving device Send to the gateway.
  • an embodiment of the present invention provides a gateway, including: a transceiver unit, configured to receive media description information of a media transfer device sent by a control point, and media description information of a transfer receiving device; the media description information is used to indicate The communication related information of the device, including: an Internet Protocol IP address, a port number, and a codec capability information of the device; an update unit, configured to: according to the media description information of the media transfer device received by the transceiver unit, and the transfer receiving The media description information of the device is updated with an address mapping table for communicating with the remote device; the transceiver unit is further configured to receive media information sent by the remote device, and the transceiver unit is further configured to be updated according to the update unit. An address mapping table for communicating with the remote device, and sending the received media information sent by the remote device to the transfer receiving device.
  • the updating unit is specifically configured to: store, according to the media description information of the media transfer device received by the transceiver unit, the The entry of the mapping between the IP address of the media transfer device and the port number of the receiving port and the IP address and the port number of the public network is deleted; and the media description information of the transfer receiving device received by the transceiver unit is used to establish the The mapping between the IP address of the receiving device and the port number of the receiving port and the public network IP address and port number is stored in the address mapping table.
  • the transceiver unit receives, by using a session transfer message, media description information and a transfer of the media transfer device sent by the control point. Receive media description information of the device.
  • the media information includes: a data packet header and
  • the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number;
  • the source IP address is an IP address of the remote device; and the source port number is the far a port number of the receiving port of the end device;
  • the destination IP address is an IP address of the public network;
  • the destination port number is a port number of the public network;
  • the transceiver unit includes: a searching subunit, configured to receive the Searching for the update unit by the destination IP address and the destination port number of the data packet header of the media information
  • the address mapping table for communicating with the remote device, determining the transfer receiving device
  • the updating unit is further configured to: use a destination IP address and a destination port of the data packet header of the media information The number is updated to the IP address of the transfer receiving device and the port number of the receiving port; the transceiver subunit is specifically configured to: according to the IP address of the transfer receiving device and the port number of the receiving port determined by the searching subunit, The updated media information of the update unit is sent to the transfer receiving device.
  • an embodiment of the present invention provides a transfer receiving device, including: a transceiver unit, configured to send media description information to a control point, so that the control point, after receiving the media description information, The media description information is matched with the obtained media description information of the remote device, and if the media description information matches the obtained media description information of the remote device, the media description information is sent to the gateway.
  • the gateway updates an address mapping table for communicating with the remote device according to the media description information and media description information of the media transfer device sent by the control point, so that the gateway will use the remote device
  • the sent media information is forwarded to the transfer receiving device;
  • the media description information is used to indicate communication related information of the device, including: an Internet Protocol IP address, a port number, and a codec capability information of the device;
  • receiving media information from the remote device forwarded by the gateway is
  • the transceiver unit is further configured to receive media description information of the remote device that is sent by the control point
  • the transfer receiving device further includes: a processing unit, configured to: Determining, according to the media description information of the remote device that is received by the transceiver unit, a port number of the receiving port of the remote device, to detect whether the received media information is based on a port number of the receiving port of the remote device The media information sent by the remote device.
  • the transceiver unit receives the media description information of the remote device sent by the control point by using a session establishment message.
  • the media information includes: a data packet header and a data packet body;
  • the data packet header includes: a source IP address, a source port number, a destination IP address, and The destination port number;
  • the source IP address is the IP address of the remote device;
  • the source port number is the port number of the receiving port of the remote device;
  • the destination IP address is the IP address of the transfer receiving device;
  • the destination port number is a port number of the receiving port of the transfer receiving device;
  • the processing unit is further configured to detect a source port number and a base port in the data packet header of the media information received by the transceiver unit Whether the port number of the receiving port of the remote device determined by the media description information of the remote device is the same; detecting the source port number in the data packet header and the port of the receiving port of the remote device If the number is not the same, the media information is discarded; when it is detected that the source port number in the data packet header is the same as the port
  • the transceiver unit sends the media description information to the control point by sending a media capability response message to the control point, where the media capability response message carries the media description information.
  • the eighth aspect of the present invention provides a media transfer device, including: a transceiver unit, configured to receive a media capability message sent by a control point, where the transceiver unit is further configured to send media description information to the control point, And sending, to the control point, the media description information and the media description information of the transfer receiving device to the gateway, so that the gateway performs the transfer according to the media description information and the transfer
  • the media description information of the receiving device updates an address mapping table used for communication with the remote device, so that the gateway forwards the media information sent by the remote device to the transfer receiving device; the media description information is used to indicate the device Communication related information, including: Internet Protocol IP address, port number and codec capability information of the device.
  • the transceiver unit is further configured to: before sending the media description information to the control point, send a service transfer request message to the control point, where the service transfer request message carries The media transfer device requests information of the transferred service.
  • the embodiment of the present invention provides a system for media transfer, including: The physical transfer device, the transfer receiving device, the control point, the gateway; wherein, the control point is a control point provided by the foregoing embodiment; the gateway is a gateway provided by the foregoing embodiment; A transfer receiving device provided by an embodiment.
  • the embodiment of the invention provides a method, a device and a system for media transfer.
  • the control point matches the obtained media description information of the local device with the obtained media description information of the remote device by acquiring the media description information of the local device. And determining the transfer receiving device according to the matching result.
  • the media description information of the transfer receiving device and the media description information of the media transfer device are sent to the gateway, so that the gateway updates the address mapping table according to the media description information of the transfer receiving device and the media description information of the media transfer device.
  • the gateway can determine the transfer receiving device that should receive the media information sent by the remote device according to the updated address mapping table, and send the media information to the transfer receiving device.
  • the communication between the remote device and the media transfer device is transferred to the remote device.
  • the communication with the transfer device is changed, the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • FIG. 1 is a schematic diagram of a method for media transfer according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of another method for media transfer according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of another method for media transfer according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of another method for media transfer according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of another method for media transfer according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a method for communication between devices after media transfer according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a control point according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of another control point according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a gateway according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of the transceiver unit shown in FIG. 11;
  • FIG. 13 is a schematic structural diagram of a transfer receiving device according to an embodiment of the present invention
  • FIG. 14 is a schematic structural diagram of a media transfer device according to an embodiment of the present invention
  • FIG. 16 is a schematic structural diagram of another gateway according to an embodiment of the present invention
  • FIG. 17 is a schematic structural diagram of another transfer receiving device according to an embodiment of the present invention
  • FIG. 18 is a schematic structural diagram of another media transfer device according to an embodiment of the present invention.
  • FIG. 19 is a schematic structural diagram of a system for media transfer according to an embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of them. Example. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • An embodiment of the present invention provides a method for media transfer. As shown in FIG. 1 , the method includes: 101. Obtain media description information of a local device.
  • the media description information is used to indicate communication related information of the device, and may include: an IP address of the device, an address, a port number, and a codec capability information.
  • the local device includes: a media transfer device and at least one first device. It should be noted that the local device refers to the device managed by the control point.
  • the media transfer device refers to a device in the local device that needs to perform media transfer.
  • the first device refers to a device other than the media transfer device in the local device.
  • the media description information may further include: a transmission protocol and/or a media format.
  • media description information may also include other information, which is not limited by the present invention.
  • the port number in the media description information is the port number used by the device to receive media information sent by other devices.
  • the obtaining the media description information of the local device includes: obtaining media description information of the media transfer device and media description information of the at least one first device.
  • control point may send a message for obtaining the media description information to the local device, receive the media description information returned by the local device, and obtain the media description information of the local device.
  • control point can be obtained by acquiring media capabilities.
  • the control point can obtain the media description information of the local device through the POST (Notification) method of HTTP (hypertext transport protocol).
  • POST Notification
  • HTTP hypertext transport protocol
  • the control point receives the HTTP response message containing the media description information returned by the local device.
  • the specific signaling of the HTTP response message is as follows:
  • control points can be integrated in the local device. If the control point is integrated in a local device, the control point stores the media description information of the local device that integrates the control point, so the control point acquires the local device. When the media describes the information, you can get the media description information of other local devices that do not have this control point integrated.
  • the control point may be integrated in the media transfer device. Since the control point has already learned the media description information of the media transfer device, the control point acquires the media description information of the first device.
  • the control point may also not be integrated in any device, but a separate device, at which point the control point obtains media description information for all devices in the local device.
  • the media description information of the obtained at least one first device is matched with the obtained media description information of the remote device, and the transfer receiving device is determined from the at least one first device according to the matching result.
  • the remote device is a network side device that communicates with the media transfer device.
  • the transfer receiving device refers to a device that performs media transfer with the media transfer device in the local device.
  • the control point when the media transfer device communicates with the remote device, the control point has obtained the media description information of the remote device.
  • the control point after obtaining the media description information of the local device, the control point, according to the media description information of the remote device that is obtained in advance, the media description information of the at least one first device in the local device and the pre-acquired remote device The media description information is matched, and the transfer receiving device is determined according to the matching result.
  • the control point transmits the transmission protocol, the media format, the codec capability information of the media description information of the at least one first device in the local device, and the transmission protocol, the media format, and the codec capability information of the media description information of the pre-stored remote device.
  • Matching if the transmission protocol, media format, codec capability information of the media description information of a first device of the local device matches the transmission protocol, media format, codec capability information of the media description information of the pre-stored remote device And determining the first device as a transfer receiving device.
  • the first device is determined as the transfer receiving device.
  • control point If the media description information of the first device does not match the media description information of the remote device, the control point generates a media transfer failure message, which can be fed back to the user by the media transfer device.
  • the media transfer device and the at least two first devices are acquired by the control point, if at least two first local devices are included in the at least two first devices, the at least two are One of the first local devices is determined to be a transfer receiving device.
  • the first local device refers to a first device whose media description information matches the media description information of the remote device.
  • the control point determines a first local device of the at least two first local devices as a method for transferring the receiving device, and the control point may feed back the at least two first local devices to the user, and after the user selects, The first local device selected by the user is determined to be a transfer receiving device. It is also possible that the control point arbitrarily selects a first local device as the transfer receiving device.
  • control point determines a method for determining the first local device of the at least two first local devices as the method for transferring the receiving device, and may be other methods, which are not limited by the present invention.
  • control point may generate, according to the matching result, the at least one first local device to generate a selection list for transferring the current media transfer service to the local device. Select a local device as the transfer receiving device in the selection list.
  • the media description information of the media transfer device and the media description information of the transfer receiving device are sent to the gateway, so that the gateway according to the media description information of the media transfer device and the media description of the transfer receiving device
  • the information updates an address mapping table for communication with the remote device such that the gateway forwards media information sent by the remote device to the transfer receiving device.
  • control point may send the media description information of the media transfer device and the media description information of the transfer receiving device to the gateway by using a session transfer message (SessionTransfer).
  • SessionTransfer a session transfer message
  • the media transfer device is a mobile phone and the transfer receiving device is a TV (TV)
  • the media transfer service to which the phone is to be transferred is a video session
  • the remote media description information may be voice or video.
  • the control point sends the media description information of the phone and the media description information of the TV to the gateway through the session transfer message (SessionTransfer), and uses the HTTP POST method, and the specific signaling is as follows:
  • the embodiment of the present invention provides a method for media transfer.
  • the control point obtains the media description information of the local device and the acquired information by acquiring the media description information of the local device.
  • the media description information of the remote device is matched, and the transfer receiving device is determined according to the matching result.
  • the gateway may determine, according to the updated address mapping table, the transfer receiving device that should receive the media information sent by the remote device, and send the media information to the transfer receiving device.
  • the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • An embodiment of the present invention provides a method for media transfer, as shown in FIG. 2, including:
  • the media description information is used to indicate communication related information of the device, and includes: an Internet Protocol IP address, a port number, and codec capability information of the local device.
  • the transfer receiving device is a device in the local device that performs media transfer with the media transfer device.
  • the media transfer device refers to a device to perform media transfer.
  • the remote device is a network side device that communicates with the media transfer device.
  • the media description information further includes: a media format and/or a transport protocol.
  • the gateway may receive the media description information of the media transfer device sent by the control point and the media description information of the transfer receiving device by using a session transfer message (Se s s i onTrans fer ).
  • the gateway may use, according to the media description information of the media transfer device, the IP address of the media transfer device and the port number of the receiving port stored in the address mapping table and the IP address and port number of the public network.
  • the entry of the mapping relationship is deleted.
  • the internal network IP address of the gateway on the intranet side is 192. 168. 1. 1
  • public The public IP address on the common network side is 10.11.20.240.
  • the IP address of the local device on the intranet side of the gateway is obtained through DHCP (Dynamic Host Configuration Protocol).
  • the media description device is a phone, and the media description information of the transfer receiving device for the TV phone includes: the IP address of the phone is 192.168.1.2, and the port description of the receiving port of the phone is 5060.
  • the media description information of the TV includes: 192.168.1.3, the port number of the TV receiving port is 5060
  • the gateway establishes a mapping relationship between the IP address of the phone and the port number of the receiving port and the public network IP address and port number, and is stored as an entry in the address mapping table.
  • the mapping table As shown in Table 1 below.
  • the gateway receives the media description information of the phone and the TV sent by the control point, and the gateway searches the address mapping table according to the IP address of the phone in the media description information of the phone and the port number of the receiving port, and the IP address of the address mapping table and the phone
  • the address and the port number of the receiving port are matched, and the IP address of the TV and the port number of the receiving port and the public network IP address and port are established according to the IP address in the media description information of the TV and the port number of the receiving port.
  • the mapping relationship between the number and the mapping between the IP address of the newly established TV and the port number of the receiving port and the public network IP address and port number is stored in the address mapping table as an entry in the address mapping table, as shown in the following table. 2 is shown.
  • the gateway receives the media information sent by the remote device.
  • the media information includes: a data packet header and a data packet body.
  • the data packet header of the media information sent by the media transfer device includes: a source IP address, a source port number, a destination IP address, and a destination port number.
  • the source IP address in the data packet header of the media information sent by the remote device is the IP address of the remote device
  • the source port number is the port number of the receiving port of the remote device
  • the destination IP address is the IP address of the gateway.
  • the destination port number is the port number of the gateway.
  • the public IP address of the public network side of the gateway is 1 0. 11. 20. 240 and the port number is 1234.
  • the IP address of the remote device is 173. 194. 64. 147 , the port number of the receiving port of the remote device is 6060, in the data packet header in the media information sent by the remote device received by the gateway.
  • the source IP address is 173. 194. 64. 147, the source port number is 6060, the destination IP address is 10.1 1. 20. 240, and the destination port number is 1234.
  • the gateway parses the data packet header in the media information, and searches for the updated device and the remote device according to the destination IP address and the destination port number in the data packet header.
  • the address mapping table of the communication thereby obtaining the IP address and port number of the transfer receiving device.
  • the received media information sent by the remote device is sent to the media transfer device according to the obtained IP address and port number of the transfer receiving device.
  • the gateway receives the media information sent by the remote device, and parses out the source IP address in the data packet header of the media information is 173. 194. 64. 147 , the source port number is 6060, and the destination IP address is 10. 1 1. 20. 240, the destination port number is 1234, the destination IP address is 1 0. 11. 20. 240, the destination port number is 1234 to find the address mapping table, refer to Table 2, and find the IP address as 10. 11. 20. 240, the port number is 1234, the corresponding transfer receiving device's IP address is 192. 168. 1. 3, the port number is 5060, then the gateway according to the searched IP address is 192. 168. 3, The port number is 5060, and the media information is sent to the transfer receiving device.
  • the embodiment of the invention provides a method for media transfer.
  • the gateway receives the media description information of the transfer receiving device and the media description information of the media transfer device, and updates the address according to the media description information of the transfer receiving device and the media description information of the media transfer device. Mapping table.
  • the gateway may determine, according to the updated address mapping table, the transfer of the media information that should be received by the remote device.
  • the communication between the remote device and the media transfer device is transferred to the communication between the remote device and the transfer receiving device, the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • An embodiment of the present invention provides a method for media transfer, as shown in FIG. 3, including:
  • the control point sends media description information to the control point, so that after receiving the media description information, the control point matches the media description information with the obtained media description information of the remote device, where the media is If the description information matches the media description information of the obtained remote device, the media description information is sent to the gateway, so that the gateway sends the media transfer device according to the media description information and the control point.
  • the media description information updates an address mapping table for communicating with the remote device, so that the gateway forwards the media information sent by the remote device to the transfer receiving device.
  • the media description information is used to indicate communication related information of the device, and includes: an Internet Protocol IP address, a port number, and codec capability information of the local device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the transfer receiving device may send a media capability response message to the control point, where the media capability response message carries the media description information. That is, after receiving the Get Media Capability message (Ge tMed i aCapab ilities ) sent by the control point, the transfer receiving device adds the media description information of the transfer receiving device to the acquired media capability response message, and obtains the media capability response. The message is sent to the control point.
  • the Get Media Capability message (Ge tMed i aCapab ilities ) sent by the control point
  • the transfer receiving device adds the media description information of the transfer receiving device to the acquired media capability response message, and obtains the media capability response. The message is sent to the control point.
  • the gateway updates the address mapping table used for communication with the remote device
  • the gateway receives the media information sent by the remote device
  • the gateway searches for the updated address mapping table to obtain the transfer receiving device.
  • the IP address and the port number are sent to the transfer receiving device according to the IP address and the port number of the transfer receiving device, and the transfer receiving device receives the media information sent by the remote device forwarded by the gateway.
  • a media transfer method is provided in the embodiment of the present invention, the transfer receiving device sends the media description information to the control point, so that the control point, after receiving the media description information, the media description information and the acquired remote device Media description information to match If the media description information matches the obtained media description information of the remote device, the media description information is sent to the gateway, so that the gateway sends the media according to the media description information and the control point.
  • the media description information of the transfer device updates an address mapping table for communication with the remote device, so that the gateway forwards the media information sent by the remote device to the transfer receiving device.
  • the transfer receiving device receives the media information sent by the remote device through the gateway, so that when the communication between the remote device and the media transfer device is transferred to the communication between the remote device and the transfer receiving device, there is no need to change the relationship established with the remote device on the network side. Communication links improve network efficiency. Moreover, the media information sent by the remote device is not changed when being transmitted on the network side, thereby further improving the network effect.
  • the embodiment of the present invention provides a media transfer method. As shown in FIG. 4, the method includes:
  • the media description information is used to indicate communication related information of the device, including: an Internet Protocol IP address, a port number, and codec capability information of the device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the media transfer device may send a get media capability response message to the control point.
  • the acquiring media capability response message carries media description information. That is, after receiving the media capability message (Ge tMed i aCapab ilities ) sent by the control point, the media transfer device adds the media description information of the media transfer device to the acquired media capability response message, and obtains the media capability response. The message is sent to the control point.
  • control point is integrated in the media transfer device
  • the user sends a service transfer request to the control point through the media transfer device; so that the control point performs the service transfer.
  • a media transfer method is provided by the media transfer device according to an embodiment of the present invention. And sending the information to the control point, so that the media description information and the media description information of the transfer receiving device are sent to the gateway in the case that the control point determines the transfer receiving device, so that the gateway is configured according to the The media description information and the media description information of the transfer receiving device update an address mapping table for communicating with the remote device, such that the gateway forwards the media information sent by the remote device to the transfer receiving device.
  • the communication between the remote device and the media transfer device is transferred to the communication between the remote device and the transfer receiving device, the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • An embodiment of the present invention provides a method for media transfer. As shown in FIG. 5, the method includes: 501. A media transfer device communicates with a remote device.
  • the media transfer device first sends the media information to be sent to the remote device to the gateway, and then the gateway sends the media information to the remote device.
  • the media information includes: a data packet header and a data packet body.
  • the data packet header of the media information sent by the media transfer device includes: a source IP address, a source port number, a destination IP address, and a destination port number.
  • the source IP address in the data packet header of the media information sent by the media transfer device is the IP address of the media transfer device
  • the source port number is the port number of the media transfer device used to receive the media information sent by the remote device, that is, The port number of the receiving port of the media transfer device
  • the destination IP address is the IP address of the remote device
  • the destination port number is the port number of the receiving port of the remote device.
  • the gateway receives the media information sent by the media transfer device, searches for the address mapping table according to the source IP address and the source port number of the data in the media information, and finds the source IP address and the source port number in the address mapping table. According to this entry, the source IP address and source port number of the data packet header are changed from the IP address of the media transfer device and the port number of the media transfer device to the IP address of the public network and the port of the public network. No. The destination IP address and destination port number are unchanged.
  • the data packet header of the media information includes: the source IP address is the public network IP address, the source port number is the public network port number, the destination IP address is the IP address of the remote device, and the destination port number is the receiving of the remote device. The port number of the port, which sends this media information to the remote device.
  • the media transfer device is phone, phone and remote device CP (Central Processor, Central Processing Unit) Perform video communication.
  • the media information sent between the phone and the CP is a video data message.
  • the intranet IP address of the gateway is 192.168.1.1
  • the public IP address of the public network is 10.11.20.240.
  • the IP address of the local device on the inner network side of the gateway is obtained through DHCP.
  • the IP address of the phone is 192.168.1.2, and the port number used to receive the media information sent by the remote device is 5060.
  • the IP address of the remote device CP is 173.194.64.147, and the port number of the receiving port of the remote device CP is 6060.
  • the phone sends a video data message to the gateway.
  • the source IP address of the 4 ⁇ header in the video data is 192.168.1.2
  • the source port number is 5060
  • the destination IP address is 173.194.64.147
  • the destination port number is 6060.
  • the gateway After receiving the video data packet sent by the phone, the gateway searches the address mapping table according to the source IP address 192.168.1.2 and the source port number 5060 in the packet header of the video data packet, and finds the source IP address in the address mapping table.
  • the source port number 5060 matches the entry, and obtains the IP address of the public network corresponding to the source IP address 192.168.1.2, source port number 5060, and the port number of the public network.
  • the IP address of the public network corresponding to the source IP address 192.168.1.2 is 10.11.20.240
  • the public network port number corresponding to the source port number 5060 is 1234.
  • the gateway will video data. Change the source IP address and source port number in the packet header of the packet to the IP address of the public network and the port number of the public network. That is, the source IP address in the header of the video data packet is changed from 192.168.1.2 to 10.11.20.240, and the source port number is changed from 5060 to 1234.
  • the 4 data header of the video data packet includes The source IP address is 10.11.20.240, the source port number is 1234, the destination IP address is 173.194.64.147, and the destination port number is 6060.
  • the gateway sends this video data packet to the remote device.
  • the remote device sends the media information to the media transfer device
  • the remote device first sends the media information to be sent to the media transfer device to the gateway, and then the gateway sends the media information to the media transfer device.
  • the source IP address in the data packet header of the media information sent by the remote device is the IP address of the remote device
  • the source port number is the port number of the receiving port of the remote device
  • the destination IP address is the media transfer device.
  • the destination port number is the port number of the public network to which the media transfer device belongs.
  • the gateway receives the media information sent by the remote device, according to the datagram in the media information.
  • the destination IP address and the destination port number of the header find the address mapping table, and find the entry matching the destination IP address and the destination port number in the address mapping table. According to this entry, the data packet is optional.
  • the destination IP address and destination port number of the header are changed from the IP address of the public network and the port number of the public network to the IP address of the media transfer device and the port number of the receiving port of the media transfer device, and the source IP address and the source port number are unchanged.
  • the data packet header of the media information includes: the destination IP address is the media transfer device IP address, the destination port number is the port number of the receiving port of the media transfer device, the source IP address is the IP address of the remote device, and the source port number is The port number of the receiving port of the remote device.
  • the media information is sent to the media transfer device according to the IP address of the media transfer device and the port number of the receiving port of the media transfer device.
  • the port number of the receiving port of the media transfer device stored in the address mapping table of the gateway is the port number used by the media transfer device to receive the media information sent by the remote device.
  • the remote device first sends a video data message to the gateway.
  • the source IP address of the ⁇ header is 173. 194. 64. 147, the source port number is 6060, the destination IP address is 10. 11. 20. 240, and the destination port number is 1234.
  • the gateway After receiving the video data packet sent by the remote device CP, the gateway searches for the address mapping table according to the destination IP address in the header of the video data packet, 10.4.2.240, the destination port number 1234, and finds the address.
  • the corresponding port number is 5060.
  • the gateway modifies the destination IP address and the destination port number in the header of the video data to the phase-shifted IP address found in the address mapping table, and the corresponding port number. That is, the destination IP address in the header of the video data packet is changed from 10. 11. 20. 24 4 ⁇ to 192. 168. 1. 2 , and the destination port number is changed from 1234 4 ⁇ to 5060.
  • the source IP address of the packet header of the video data packet is 173. 194. 64. 147 , the source port number is 6060, the destination IP address is 192. 168. 1. 2 , and the destination port number is 5060.
  • the IP address found in the gateway address mapping table is 192. 168. 1. 2 , and the corresponding port number is 5060. This video data packet is sent to the media transfer device.
  • the media transfer device sends a service transfer request message to the control point, where the control point receives the service transfer request message sent by the media transfer device.
  • the service transfer request message carries information of a service that the media transfer device requests to perform the transfer.
  • the service transfer request message further carries the identification information of the media transfer device.
  • the user when the user decides to perform media transfer of the service of the media transfer device, the user sends a service transfer request message to the control point through the media transfer device, and the control point receives the service transfer request message sent by the media transfer device.
  • the control point may carry the transferred service information according to the service information of the media transfer device, and determine the media transfer device in the local device managed by the control point, and perform the media transfer.
  • the business in which the device is running determines the business that needs to be transferred.
  • the user may send a service transfer request message to the control point by using other methods.
  • the user may directly send the service transfer request message through the controller of the control point, which is not limited by the present invention.
  • the control point detects the local network, determines the local device, and obtains service description information of the local device.
  • the service description information is information of a service supported by the device.
  • the service description information includes: video information, voice information, and the like.
  • the control point detects the local network, and when determining the local device, the URL (Uniform / Universal Resource Locator) of all devices in the local device may be obtained.
  • the control point can obtain the UPnP (Universal Plug and Play) description of all devices in the local device according to the obtained URL.
  • the description of the UPnP is divided into the description of the device and the service description supported by the device. Therefore, when the control point obtains the description of the UPnP, the control point can obtain the description of all the devices in the local device, that is, the type of the device, the identifier, and the like. You can obtain the service descriptions supported by all devices in the local device, that is, obtain the service description information of the device.
  • the local device includes: a media transfer device and at least one first device.
  • the control point can obtain the URL of the local device through the HTTP protocol.
  • the specific signaling is as follows:
  • the control point can obtain the device description of the local device and the service of the device through signaling. Specifically, the control point obtains the specific signaling of the device description of the local device, as follows:
  • control point may obtain the device description of the TV by using the following signaling:
  • the specific signaling used by the control point to obtain the service description information of the local device is as follows:
  • control points can be integrated in the local device. If the control point is integrated in a local device, the control point stores the media description information of the local device that integrates the control point. Therefore, when the control point obtains the media description information of the local device, the control point can obtain the control without integrating the control. Media description information for other local devices.
  • the control point can be integrated in the media transfer device. Since the control point has learned the media description information of the media transfer device, the control point obtains media description information of other local devices other than the media transfer device.
  • the control point may not be integrated in any device, but a separate device.
  • the control point obtains media description information of all the client devices in the local network, including: media description information of the media transfer device and media of the transfer receiving device Description.
  • media description information of the media transfer device and media of the transfer receiving device Description.
  • the gateway can be integrated in the local device.
  • the transfer receiving device is a TV
  • the gateway can be integrated in the TV, and at this time, the gateway can be a set top box.
  • the gateway may not be integrated in any one device, but is a separate device. Only one case where the control point is a separate device is shown in FIG. 5, which is not limited by the present invention.
  • the control point matches the service description information with the service that the media transfer device transfers.
  • control point needs to detect whether the service description information of the obtained first device supports the service to be transferred by the media transfer device according to the service to be transferred by the media transfer device.
  • the media transfer device is a phone and the service to be transferred is a video service
  • the device needs to be transferred to support the video service.
  • the control point detects the local network and discovers that there is a TV device and a printer device in the local network.
  • the control point obtains the service description information of the TV device and the service description information of the printer device. Where the service description information of the TV device includes the video service information, the TV device supports the video service. If the service description information of the printer device does not include the video service information, the printer device does not support the video service.
  • the control point Since the service that the phone needs to perform media transfer is a video service, the control point detects the service description information of the TV device according to the video service that the phone needs to perform media transfer. Check whether the service description information of the TV device matches the video service that the phone needs to perform media transfer. That is, the control point checks whether the video service is included in the service description information of the TV device. Similarly, the control point is based on the video service that the phone needs to perform media transfer, the service description information of the printer, and whether the service description information of the printer matches the video service that the phone needs to perform media transfer.
  • the control point detects that the service description information of the TV device matches the video service that the phone needs to perform media transfer, the following steps are continued. Since the service description information of the printer does not include: video service information, the control point detects that the service description information of the printer device does not match the video service that the phone needs to perform media transfer, and does not continue the following steps.
  • the transfer failure message may be sent to the media transfer device.
  • the control point obtains the media description information of the local device.
  • the control point can detect, in step 504, which service description information of the local device matches the service that the media transfer device performs the transfer, and obtain the service description information to match the service that the media transfer device performs the transfer.
  • Media description information for the local device For a process for the control point to specifically obtain the media description information of the local device that matches the service description information and the service that the media transfer device performs the transfer, refer to step 1 01, and details are not described herein again. Further, when the local device returns the media description information to the control point, refer to steps 301, 401, and 402, and details are not described herein again.
  • step 1 02 Same as step 1 02, and will not be described here.
  • the control point sends the media description information of the remote device to the transfer receiving device, so that the transfer receiving device determines the port number of the receiving port of the remote device according to the media description information of the remote device, so as to The port number of the receiving port of the remote device detects whether the received media information is the media information sent by the remote device.
  • the transfer receiving device receives the media description information of the remote device.
  • the control point sends the media description information of the remote device to the transfer receiving device. Because the media description information of the remote device includes the port number information, the transfer receiving device can determine the port number of the receiving port of the remote device according to the media description information of the remote device, so that the receiving device is transferred according to the remote device. The port number of the receiving port, which detects the media information received through the gateway. Whether it is the media information sent by the remote device.
  • control point may send the media description information of the remote device to the transfer receiving device by using a session setup message (SessionSetup).
  • SessionSetup a session setup message
  • the media transfer device is a mobile phone and the transfer receiving device is a TV (TV)
  • the media transfer service to be transferred is a video session
  • the media description information of the remote end may be a voice. Or video related information.
  • the control point sends the media description information of the remote device to the TV through a session establishment message (SessionSetup), and the specific signaling is as follows:
  • the transfer receiving device receives the media description information of the remote device sent by the control point through a session establishment message (SessionSetup). That is, the transfer receiving device receives the media description information of the remote device sent by the control point by receiving a session setup message (SessetSetup).
  • the control point sends the media description information of the media transfer device and the media description information of the transfer receiving device to the gateway, where the gateway receives the media description information of the media transfer device and the media description information of the transfer receiving device.
  • step 103 the process of sending the media description information of the media transfer device and the media description information of the transfer receiving device to the gateway may be referred to in step 103, and details are not described herein again.
  • step 201 the process of receiving the media description information of the media transfer device and transferring the media description information of the receiving device.
  • step 507 may be performed first, and then step 508 may be performed.
  • Step 508 may be performed first.
  • step 507 and step 508 may also be performed simultaneously. In FIG. 5, only one case is shown.
  • the transfer receiving device determines, according to the media description information of the remote device that is sent by the control device, a port number of the receiving port of the remote device, so as to detect the received media information according to the port number of the receiving port of the remote device. Whether it is the media information sent by the remote device.
  • the transfer receiving device determines the port number in the media description information as the port number of the receiving port of the remote device.
  • step 510 The same as step 202, and details are not described herein again.
  • step 509 and step 510 are not limited, and step 509 may be performed first, then step 510 may be performed, or step 510 may be performed first, and then step 509 may be performed. Step 509 and step 510 are performed at the same time, and only one case is shown in FIG.
  • the gateway receives the media information sent by the remote device.
  • the media information includes: a data packet header and a data packet body; the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number.
  • the source IP address in the data packet header in the media information sent by the remote device is an IP address of the remote device.
  • the source port number is the port number of the receiving port of the remote device.
  • the destination IP address is the IP address of the public network.
  • the destination port number is the port number of the public network.
  • the media transfer device is a phone and the transfer receiving device is a TV.
  • the phone communicates with the remote device CP (Cen ra l Proce ss or , central processing unit). Now the phone needs to transfer the video service, and the control point selects the TV as the transfer receiving device, that is, the phone transfers the video service to TV, the TV communicates with the remote device CP by the TV.
  • the media information sent between the CP and the phone is a video data message.
  • the internal network IP address of the gateway on the intranet side is 192. 168. 1. 1
  • the public IP address on the public network side is 10. 11. 20. 240.
  • IP address of the local device on the intranet side of the gateway Obtained via DHCP.
  • the media transfer device is a phone
  • the transfer receiving device is a TV.
  • the media description information of the phone includes: The IP address of the phone is 192.168.1.2, and the port number of the receiving port of the phone is 5060.
  • the media description information of the TV includes: The IP address of the TV is 192.168.1.3, and the port number of the receiving port of the TV is 5060.
  • the IP address of the remote device CP is 173.1194.64.147, and the port number of the receiving port of the remote device is 6060.
  • the remote device CP sends the video data packet to the gateway.
  • the gateway detects the destination IP address of the packet header of the video data packet as 10.11.20.240.
  • the gateway searches for the address mapping table according to the destination IP address of the video data packet with the destination IP address of 10.11.20.240 and the destination port number of 1234.
  • the IP address is 10.11.20.240, and the port is found in the address mapping table.
  • the number is the matching entry of 1234. According to this entry, the IP address corresponding to the destination IP address 10.11.20.240 and the destination port number 1234 is 192.168.1.3, and the corresponding port number is 5060.
  • the gateway modifies the destination IP address and destination port number in the packet header of the video data packet to the corresponding IP address and port number found in the address mapping table. That is, the destination IP address in the header of the video data packet is changed from 10.11.20.244 to 192.168.1.3, and the destination port number is changed from 1234 to 5060.
  • the header of the video data packet includes The source IP address is 173.194.64.147, the source port number is 6060, the destination IP address is 192.168.1.3, and the destination port number is 5060.
  • the gateway sends the video data message to the TV according to the IP address and port number of the TV found in the address mapping table.
  • the gateway modifies the destination IP address and the destination port number in the video data packet to the IP address and port number of the TV, the updated video data packet is sent to the transfer receiving device, that is, the gateway will update.
  • the subsequent video data message is sent to the TV.
  • the TV If the transfer receiving device is transferred, that is, the TV needs to send a video data packet to the remote device, as shown in FIG. 8, the TV first sends a video data message to the gateway.
  • the source IP address of the 4 ⁇ header in the video data packet is 192.168.1.3, the source port number is 5060, the destination IP address is 173.194.64.147, and the destination port number is 6060.
  • the gateway After receiving the video data packet sent by the TV, the gateway searches the address mapping table according to the source IP address 192.168.1.3 and the source port number 5060 in the packet header of the video data packet, and finds the source IP address in the address mapping table.
  • the source port number 5060 matches the entry, and obtains the IP address of the public network corresponding to the source IP address 192.168.1.3, source port number 5060.
  • the gateway modifies the source IP address and source port number in the 4 ⁇ header of the video data to the IP address of the public network and the port number of the public network. That is, the source IP address in the header of the video data packet is changed from 192.168.1.3 to 10. 11. 20. 240, and the source port number is changed from 5060 to 1234.
  • the source IP address of the 4 ⁇ ⁇ header includes 10. 11. 20. 240 , the source port number is 1234, the destination IP address is 173. 194. 64. 147 , and the destination port number is 6060.
  • the gateway sends the updated video data packet to the remote device.
  • the gateway sends the received media information sent by the remote device to the transfer receiving device, where the transfer receiving device receives the media information sent by the remote device forwarded by the gateway.
  • the media information includes: a data packet header and a data packet body; the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number.
  • the source IP address is an IP address of the remote device; the source port number is a port number of the receiving port of the remote device.
  • the destination IP address is an IP address of the transfer receiving device; the destination port number is a port number of the receiving port of the transfer receiving device.
  • step 204 For details, refer to step 204 and step 302, and details are not described herein again.
  • the source port number in the data packet header of the transfer receiving device detecting the media information is the same as the port number of the receiving port of the remote device determined according to the media description information of the remote device. .
  • the transfer receiving device parses the data packet header of the media information. And comparing the source port number in the data packet header of the media information with the port number of the receiving port of the remote device determined according to the media description information of the remote device.
  • the transfer receiving device discards the media information if it detects that the source port number in the data packet header is different from the port number of the receiving port of the remote device. If it is detected that the source port number in the data packet header is the same as the port number of the receiving port of the remote device, the media information is processed.
  • the embodiment of the present invention provides a method for media transfer.
  • the control point matches the obtained media description information of the local device with the stored media description information of the remote device by obtaining the media description information of the local device, and determines according to the matching result.
  • Transfer the receiving device Sending media description information of the remote device to the transfer receiving device.
  • Send a transfer to the gateway The media description information of the device and the media description information of the media transfer device are received, so that the gateway updates the address mapping table according to the media description information of the transfer receiving device and the media description information of the media transfer device. In this way, when receiving the media information sent by the remote device, the gateway may determine, according to the updated address mapping table, the transfer receiving device that should receive the media information sent by the remote device, and send the media information to the transfer receiving device.
  • the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • An embodiment of the present invention provides a control point, as shown in FIG. 9, including:
  • the obtaining unit 801 is configured to obtain media description information of the local device.
  • the media description information is used to indicate communication related information of the device, and includes: an Internet Protocol IP address, a port number, and codec capability information of the local device.
  • the local device includes: a media transfer device and at least one first device.
  • the local device refers to the device managed by the control point.
  • the media transfer device refers to a device in the local device that needs to perform media transfer.
  • the first device refers to a device other than the media transfer device in the local device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the acquiring unit 801 is specifically configured to obtain media description information of the media transfer device and media description information of the at least one first device.
  • the acquiring unit 801 is specifically configured to obtain media description information of the local device by acquiring a media capability message (Ge tMed i aCapab i l i t i e s ).
  • the processing unit 802 is configured to match the media description information of the at least one first device acquired by the acquiring unit 801 with the media description information of the obtained remote device, according to the matching result, from the at least one first device The transfer receiving device is determined.
  • the transceiver unit 803 is configured to send media description information of the media transfer device and media description information of the transfer receiving device to a gateway, so that the gateway according to the media description information of the media transfer device and the The media description information of the transfer receiving device updates an address mapping table for communication with the remote device, so that the gateway forwards the media information sent by the remote device to the transfer receiving device.
  • the transceiver unit 803 is specifically configured to transfer a message by using a session. (SessionTransfer) Sending the media description information of the media transfer device and the media description information of the transfer receiving device to the gateway.
  • SessionTransfer Sending the media description information of the media transfer device and the media description information of the transfer receiving device to the gateway.
  • the transceiver unit 803 is further configured to send the media description information of the remote device to the transfer receiving device determined by the processing unit 802, so that the transfer receiving device is configured according to the remote device.
  • the media description information determines the port number of the receiving port of the remote device, so as to detect whether the received media information is the media information sent by the remote device according to the port number of the receiving port of the remote device.
  • the transceiver unit 803 is specifically configured to send media description information of the remote device to the transfer receiving device by using a session setup message (SessetSetup).
  • the control point as shown in FIG. 10, further includes: a detecting unit 804.
  • the transceiver unit 803 is further configured to receive a service transfer request message sent by the media transfer device.
  • the service transfer request message carries information of a service that the media transfer device requests to transfer.
  • the detecting unit 804 is configured to detect a local network, and determine the local device.
  • the obtaining unit 801 is further configured to acquire service description information of the local device determined by the detecting unit 804.
  • the service description information is information of a service supported by the device.
  • the processing unit 802 is further configured to match the service description information of the local device acquired by the obtaining unit 801 with the service that the media transfer device performs transfer.
  • the obtaining unit 801 acquires, according to the matching result matched by the processing unit 802, the media description information of the local device that matches the service description information with the service that the media transfer device performs the transfer.
  • the embodiment of the present invention provides a control point, and the control point matches the obtained media description information of the local device with the stored media description information of the remote device by acquiring the media description information of the local device, and determines the transfer according to the matching result.
  • Receiving device Transmitting the media description information of the transfer receiving device and the media description information of the media transfer device to the gateway, so that the gateway updates the address mapping table according to the media description information of the transfer receiving device and the media description information of the media transfer device. In this way, the gateway is sent to the remote device.
  • the media information is determined according to the updated address mapping table, and the transfer receiving device that should receive the media information sent by the remote device is determined, and the media information is sent to the transfer receiving device.
  • the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • An embodiment of the present invention provides a gateway, as shown in FIG. 11, including:
  • the transceiver unit 1001 is configured to receive media description information of the media transfer device sent by the control point and media description information of the transfer receiving device.
  • the media description information is used to indicate communication related information of the device, and includes: an Internet Protocol IP address, a port number, and codec capability information of the local device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the transceiver unit 1001 receives the media description information of the media transfer device sent by the control point and the media description information of the transfer receiving device by using a session transfer message (Ses s i onTrans fe r ).
  • the updating unit 1002 is configured to update an address mapping table used for communication with the remote device according to the media description information of the media transfer device and the media description information of the transfer receiving device received by the transceiver unit 1001.
  • the updating unit 1002 is specifically configured to: according to the media description information of the media transfer device received by the transceiver unit 1001, the IP address and the receiving port of the media transfer device stored in the address mapping table. The entry of the mapping between the port number and the IP address and port number of the public network is deleted. Establishing a mapping relationship between the IP address of the transfer receiving device and the port number of the receiving port and the public network IP address and the port number according to the media description information of the transfer receiving device received by the transceiver unit 1001, and storing the mapping relationship between the IP address and the port number of the public network Said in the address mapping table.
  • the transceiver unit 1001 is further configured to receive media information sent by the remote device.
  • the media information includes: a data packet header and a data packet body; the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number.
  • the source IP address is the IP address of the remote device; the source port number is the port number of the receiving port of the remote device; the destination IP address is the IP address of the public network; The port number of the network.
  • the transceiver unit 1001 is further configured to send the received media information sent by the remote device to the transfer receiving device according to an address mapping table used by the update unit 1002 to communicate with a remote device.
  • the transceiver unit 1001 includes:
  • the searching subunit 1 0011 is configured to search, according to the received destination IP address and destination port number of the data packet header of the media information, an address mapping updated by the updating unit 1002 for communicating with the remote device. Table, determine the IP address of the transfer receiving device and the port number of the receiving port.
  • the transceiver unit 1 0012 is further configured to send the media information to the transfer receiving device according to the IP address of the transfer receiving device and the port number of the receiving port determined by the searching subunit 1 0011.
  • the updating unit 1002 is further configured to update the destination IP address and the destination port number of the data packet header of the media information to an IP address of the transfer receiving device and a port number of the receiving port.
  • the transceiver unit 1 QQ 1 2 specifically determines the IP address of the transfer receiving device and the port number of the receiving port according to the searching subunit 10011, and sends the updated media information of the updating unit 1002 to the location. Transfer the receiving device.
  • the embodiment of the present invention provides a gateway, where the gateway receives the media description information of the transfer receiving device and the media description information of the media transfer device, and updates the address mapping table according to the media description information of the transfer receiving device and the media description information of the media transfer device.
  • the gateway can determine the transfer receiving device that should receive the media information sent by the remote device according to the updated address mapping table, and send the media information to the transfer receiving device.
  • the communication between the remote device and the media transfer device is transferred to the communication between the remote device and the transfer receiving device, the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • the embodiment of the present invention provides a transfer receiving device, as shown in FIG. 13 , including: a transceiver unit 1201, configured to send media description information to a control point, so that the control point after receiving the media description information Matching the media description information with the obtained media description information of the remote device, and if the media description information matches the obtained media description information of the remote device, the media description is performed.
  • Information Sending to the gateway so that the gateway updates an address mapping table for communicating with the remote device according to the media description information and media description information of the media transfer device sent by the control point, so that the gateway will The media information sent by the remote device is forwarded to the transfer receiving device.
  • the media description information is used to indicate communication related information of the device, and includes: an Internet Protocol IP address, a port number, and codec capability information of the local device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the transceiver unit 1201 specifically sends the media description information to the control point by sending a get media capability response message to the control point.
  • the media capability response message carries the media description information.
  • the transceiver unit 1201 is further configured to receive media information from the remote device forwarded by the gateway.
  • the media information includes: a data packet header and a data packet body; the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number.
  • the source IP address is an IP address of the remote device; the source port number is a port number of the receiving port of the remote device; the destination IP address is an IP address of the transfer receiving device; the destination port number is The port number of the receiving port of the transfer receiving device.
  • transceiver unit 1201 is further configured to receive media description information of the remote device sent by the control point.
  • the transceiver unit 1201 receives the media description information of the remote device sent by the control point by using a session establishment message (Sess on).
  • the transfer receiving device as shown in FIG. 13, further includes:
  • the processing unit 1202 is configured to determine, according to the media description information of the remote device that is received by the transceiver unit 1201, a port number of the receiving port of the remote device, so as to be detected according to a port number of the receiving port of the remote device. Whether the received media information is the media information sent by the remote device.
  • the processing unit 1203 is further configured to detect a source port number in the data packet header of the media information received by the transceiver unit 1201 and determined according to media description information of the remote device. Whether the port number of the receiving port of the remote device is the same. Detecting a source port number in the data packet header and the remote device If the port numbers of the receiving ports are different, the media information is discarded. The media information is processed when it is detected that the source port number in the data packet header is the same as the port number of the receiving port of the remote device.
  • the embodiment of the present invention provides a transfer receiving device, where the transfer receiving device sends the media description information to the control point, so that the control point, after receiving the media description information, the media description information and the acquired remote device The media description information is matched, and if the media description information matches the obtained media description information of the remote device, the media description information is sent to the gateway, so that the gateway according to the media description information And the media description information of the media transfer device sent by the control point updates an address mapping table used for communication with the remote device, so that the gateway forwards the media information sent by the remote device to the transfer receiving device .
  • the transfer receiving device receives the media information sent by the remote device through the gateway, so that when the communication between the remote device and the media transfer device is transferred to the communication between the remote device and the transfer receiving device, there is no need to change the relationship established with the remote device on the network side.
  • Communication links improve network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • the embodiment of the present invention provides a media transfer device.
  • the method includes: a transceiver unit 1 301, configured to receive a media capability message sent by a control point, and the transceiver unit 1301 is further configured to send to a control point.
  • Media description information such that, in the case that the control point determines the transfer receiving device, the media description information and the media description information of the transfer receiving device are sent to the gateway, so that the gateway describes according to the media
  • the information and the media description information of the transfer receiving device update an address mapping table for communicating with the remote device, so that the gateway forwards the media information sent by the remote device to the transfer receiving device.
  • the media description information is used to indicate communication related information of the device, including: an Internet Protocol IP address, a port number, and codec capability information of the device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the transceiver unit 1301 sends a media acquisition response message to the control point to send media description information to the control point.
  • the media capability response message carries the media description information.
  • the transceiver unit 1301 is further configured to send a service transfer request message to the control point.
  • a media transfer device sends media description information to a control point, so that the media description information and the transfer reception are performed when the control point determines the transfer receiving device.
  • the media description information of the device is sent to the gateway, so that the gateway updates the address mapping table used for communication with the remote device according to the media description information and the media description information of the transfer receiving device, so that the gateway will The media information sent by the remote device is forwarded to the transfer receiving device.
  • the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • An embodiment of the present invention provides a control point, as shown in FIG. 15, including: a processor 1501, configured to acquire media description information of a local device.
  • the media description information is used to indicate communication related information of the device, and includes: an Internet Protocol IP address, a port number, and codec capability information of the local device.
  • the local device includes: a media transfer device and at least one first device.
  • the local device refers to the device managed by the control point.
  • the media transfer device refers to a device in the local device that needs to perform media transfer.
  • the first device refers to a device other than the media transfer device in the local device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the processor 1501 is specifically configured to obtain media description information of the media transfer device and media description information of the at least one first device.
  • the processor 1501 is specifically configured to obtain media description information of the local device by acquiring a media capability message (Ge tMed i aCapab i l i t i e s ).
  • the processor 1501 is further configured to: match the obtained media description information of the at least one first device with the media description information of the obtained remote device, and determine, according to the matching result, the at least one first device. Transfer the receiving device.
  • the transceiver 1502 is configured to send media description information of the media transfer device and media description information of the transfer receiving device to a gateway, so that the gateway according to the media description information of the media transfer device and the The media description information of the transfer receiving device updates an address mapping table for communication with the remote device, so that the gateway forwards the media information sent by the remote device to the transfer receiving device.
  • the transceiver 1502 is specifically configured to send the media description information of the media transfer device and the media description information of the transfer receiving device to the gateway by using a session transfer message (SessionTransfer).
  • the transceiver 1502 is further configured to send the media description information of the remote device to the transfer receiving device, so that the transfer receiving device determines the remote device according to the media description information of the remote device.
  • the port number of the receiving port is used to detect whether the received media information is the media information sent by the remote device according to the port number of the receiving port of the remote device.
  • the transceiver 1502 is specifically configured to send media description information of the remote device to the transfer receiving device by using a session setup message (SessetSetup).
  • the transceiver 1502 is further configured to receive a service transfer request message sent by the media transfer device.
  • the service transfer request message carries information of a service that the media transfer device requests to transfer.
  • the processor 1501 is further configured to detect a local network, determine the local device, and obtain service description information of the local device.
  • the service description information is information of a service supported by the device.
  • the processor 1501 is further configured to match the obtained service description information of the local device with a service that is transferred by the media transfer device.
  • the processor 1501 obtains the media description information of the local device, and specifically: acquiring, according to the matching result, the media description information of the local device that matches the service description information and the service that the media transfer device performs the transfer.
  • the embodiment of the present invention provides a control point, and the control point matches the obtained media description information of the local device with the stored media description information of the remote device by acquiring the media description information of the local device, and determines the transfer according to the matching result.
  • Receiving device Transmitting the media description information of the transfer receiving device and the media description information of the media transfer device to the gateway, so that the gateway updates the address mapping table according to the media description information of the transfer receiving device and the media description information of the media transfer device.
  • the gateway may determine, according to the updated address mapping table, the transfer receiving device that should receive the media information sent by the remote device, and send the media information to the transfer receiving device.
  • the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • An embodiment of the present invention provides a gateway, as shown in FIG. 16, including:
  • the transceiver 1601 is configured to receive media description information of the media transfer device sent by the control point and media description information of the transfer receiving device.
  • the media description information is used to indicate communication related information of the device, and includes: an Internet Protocol IP address, a port number, and codec capability information of the local device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the transceiver 1601 is specifically configured to receive media description information of the media transfer device sent by the control point and media description information of the transfer receiving device by using a session transfer message (Ses s i onTrans fe r ).
  • the processor 1602 is configured to update an address mapping table used for communication with the remote device according to the media description information of the media transfer device and the media description information of the transfer receiving device received by the transceiver 1601.
  • the processor 1602 is specifically configured to: according to the media description information of the media transfer device received by the transceiver 1601, the IP address and the receiving port of the media transfer device stored in the address mapping table. The entry of the mapping between the port number and the IP address and port number of the public network is deleted. Establishing a mapping relationship between the IP address of the transfer receiving device and the port number of the receiving port and the public network IP address and the port number according to the media description information of the transfer receiving device received by the transceiver 1601, and storing the mapping relationship between the IP address and the port number of the public network Said in the address mapping table.
  • the transceiver 1601 is further configured to receive media information sent by the remote device.
  • the media information includes: a data packet header and a data packet body; the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number.
  • the source IP address is the IP address of the remote device; the source port number is the port number of the receiving port of the remote device; the destination IP address is the IP address of the public network; The port number of the network.
  • the transceiver 1601 is further configured to send the received media information sent by the remote device according to an address mapping table that is updated by the processor 1602 for communicating with a remote device. Send to the transfer receiving device.
  • the transceiver 1601 is specifically configured to: search, according to the destination IP address and the destination port number of the data packet header of the received media information, the updated by the processor 1602 for using the remote device.
  • the address mapping table of the communication determines the IP address of the transfer receiving device and the port number of the receiving port. And transmitting the media information to the transfer receiving device according to the IP address of the transfer receiving device and the port number of the receiving port.
  • the processor 1602 is further configured to update the destination IP address and the destination port number of the data packet header of the media information to an IP address of the transfer receiving device and a port number of the receiving port.
  • the transceiver 1601 sends the media information updated by the processor 1602 to the transfer receiving device according to the IP address of the transfer receiving device and the port number of the receiving port.
  • the embodiment of the present invention provides a gateway, where the gateway receives the media description information of the transfer receiving device and the media description information of the media transfer device, and updates the address mapping table according to the media description information of the transfer receiving device and the media description information of the media transfer device.
  • the gateway can determine the transfer receiving device that should receive the media information sent by the remote device according to the updated address mapping table, and send the media information to the transfer receiving device.
  • the communication between the remote device and the media transfer device is transferred to the communication between the remote device and the transfer receiving device, the communication link established with the remote device on the network side does not need to be changed, thereby improving network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • the embodiment of the present invention provides a transfer receiving device, as shown in FIG. 17, including: a transceiver 1701, configured to send media description information to a control point, so that after the control point receives the media description information, Matching the media description information with the media description information of the obtained remote device, and if the media description information matches the obtained media description information of the remote device, the media description information is used.
  • Sending to the gateway so that the gateway updates an address mapping table for communicating with the remote device according to the media description information and media description information of the media transfer device sent by the control point, so that the gateway will The media information sent by the remote device is forwarded to the transfer receiving device.
  • the media description information is used to indicate communication related information of the device, including: The Internet Protocol IP address, port number, and codec capability information of the local device. Further, the media description information further includes: a transmission protocol and/or a media format. Specifically, the transceiver 1701 sends the media description information to the control point by sending a get media capability response message to the control point.
  • the media capability response message carries the media description information.
  • the transceiver 1701 is further configured to receive media information from the remote device forwarded by the gateway.
  • the media information includes: a data packet header and a data packet body; the data packet header includes: a source IP address, a source port number, a destination IP address, and a destination port number.
  • the source IP address is an IP address of the remote device; the source port number is a port number of the receiving port of the remote device; the destination IP address is an IP address of the transfer receiving device; the destination port number is The port number of the receiving port of the transfer receiving device.
  • the transceiver 1701 is further configured to receive media description information of the remote device sent by the control point.
  • the transceiver 1701 receives the media description information of the remote device sent by the control point by using a session establishment message (Se s s i onSe tup ).
  • the processor 1702 is configured to determine, according to the media description information of the remote device that is received by the transceiver 1701, a port number of the receiving port of the remote device, to detect the port number according to the receiving port of the remote device. Whether the received media information is the media information sent by the remote device.
  • the processor 1702 is further configured to detect a source port number in the data packet header of the media information received by the transceiver 1701 and determined according to media description information of the remote device. Whether the port number of the receiving port of the remote device is the same. The processor 1702 discards the media information if it is detected that the source port number in the data packet header is different from the port number of the receiving port of the remote device. The processor 15021702 processes the media information if it is detected that the source port number in the data packet header is the same as the port number of the receiving port of the remote device.
  • the embodiment of the present invention provides a transfer receiving device, where the transfer receiving device sends the media description information to the control point, so that the control point, after receiving the media description information, the media description information and the acquired remote device The media description information is matched, and if the media description information matches the obtained media description information of the remote device, Sending the media description information to the gateway, so that the gateway updates the address mapping table used for communication with the remote device according to the media description information and the media description information of the media transfer device sent by the control point, So that the gateway forwards the media information sent by the remote device to the transfer receiving device.
  • the transfer receiving device receives the media information sent by the remote device through the gateway, so that when the communication between the remote device and the media transfer device is transferred to the communication between the remote device and the transfer receiving device, there is no need to change the relationship established with the remote device on the network side.
  • Communication links improve network efficiency.
  • the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • the embodiment of the present invention improves a media transfer device.
  • the method includes: a transceiver 1801, configured to receive a media capability message sent by a control point.
  • the transceiver 1801 is further configured to send media description information to the control point, so that, when the control point determines the transfer receiving device, the media description information and the media description information of the transfer receiving device are used.
  • Sending to the gateway so that the gateway updates the address mapping table used for communication with the remote device according to the media description information and the media description information of the transfer receiving device, so that the gateway sends the media sent by the remote device Information is forwarded to the transfer receiving device.
  • the media description information is used to indicate communication related information of the device, including: an Internet Protocol IP address, a port number, and codec capability information of the device.
  • the media description information further includes: a transmission protocol and/or a media format.
  • the transceiver 1801 sends a media acquisition capability response message to the control point to send the media description information to the control point.
  • the media capability response message carries the media description information.
  • the transceiver 1801 is further configured to send a service transfer request message to the control point.
  • a media transfer device sends media description information to a control point, so that the media description information and the transfer reception are performed when the control point determines the transfer receiving device.
  • the media description information of the device is sent to the gateway, so that the gateway updates the address mapping table used for communication with the remote device according to the media description information and the media description information of the transfer receiving device, so that the gateway will
  • the media information sent by the remote device is forwarded to the transfer receiving device. Realizing the communication between the remote device and the media transfer device to the remote device and the transfer receiving device When communicating, there is no need to change the communication link established with the remote device on the network side, which improves network efficiency. Moreover, the media information sent by the remote device is not changed when transmitted on the network side, thereby further improving network efficiency.
  • the embodiment of the present invention provides a system for media transfer.
  • the system includes: a media transfer device 1901, a transfer receiving device 1902, a control point 1903, a gateway 1904, and a remote device 1905.
  • the control point 1903 is a control point described in the above embodiment.
  • the transfer receiving device 1902 is a transfer receiving device described in the above embodiment.
  • the gateway 1904 is a gateway provided by the foregoing embodiment.
  • the media transfer device 1901 is a media transfer device as described in the above embodiments. Or,
  • the control point 1903 is another control point described in the above embodiment.
  • the transfer receiving device 1902 is another transfer receiving device described in the above embodiment.
  • the gateway 1904 is another gateway provided by the foregoing embodiment.
  • the media transfer device 1901 is another media transfer device as described in the above embodiments.
  • control point 1903 is integrated in the media transfer device 1901.
  • control point 1903 is integrated in the transfer receiving device 1902.
  • the gateway 1904 is integrated in the transfer receiving device 1902.
  • the gateway is a set top box
  • the transfer receiving device 1902 is a television device.
  • the embodiment of the present invention provides a method, a device, and a system for media transfer.
  • the control point matches the media description information of the obtained local device with the media description information of the stored remote device by acquiring the media description information of the local device.
  • the transfer receiving device is determined based on the matching result. Sending the media description information of the remote device to the transfer receiving device, so that the transfer receiving device receives the media description information of the remote device, and determines the port number of the receiving port of the remote device according to the media description information, so as to be based on the remote end.
  • the port number of the receiving port of the device sends media information to the remote device.
  • the gateway Transmitting the media description information of the transfer receiving device and the media description information of the media transfer device to the gateway, so that the gateway updates the address mapping table according to the media description information of the transfer receiving device and the media description information of the media transfer device.
  • the gateway may determine, according to the updated address mapping table, the transfer receiving device that should receive the media information sent by the remote device, and send the media information to the transfer receiving device.

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  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

本发明实施例提供了一种媒体转移的方法、装置及系统，涉及通信领域，用于提高网络效率。所述方法，包括：获取本地设备的媒体描述信息；其中，本地设备包括：媒体转移设备和至少一个第一设备；将获取的至少一个第一设备的媒体描述信息与已获取的远端设备的媒体描述信息进行匹配，根据匹配结果从所述至少一个第一设备中确定出转移接收设备；将媒体转移设备的媒体描述信息及转移接收设备的媒体描述信息发送至网关，以使得所述网关根据所述媒体转移设备的媒体描述信息及所述转移接收设备的媒体描述信息更新用于与所述远端设备通信的地址映射表，以便所述网关将所述远端设备发送的媒体信息转发至所述转移接收设备。本发明适用于媒体转移业务的场景。

Description

一种媒体转移的方法、 装置及系统 本申请要求于 2013年 2月 4日提交中国专利局、申请号为 201310042705.5 中国专利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域 本发明涉及通信领域， 尤其涉及一种媒体转移的方法、 装置及系 统。 背景技术 随着数字通信的发展，人们的沟通方式不再局限于传统的语音电 话。 越来越多的终端产品支持视频通话， 语音和视频同步传输， 拉近 了人们的沟通^巨离。 为了实现基于 IP ( Internet Protocol, 互联网 十办议 ) 的语音业务, IETF ( Internet Engineering Task Force , 互 联网工程任务组） 组织制定了 SIP ( Session Initiation Protocol , 会话发起协议）协议。 目前， 基于 SIP协议的媒体会话， 可以实现呼 叫转移的业务。
基于 SIP协议的呼叫转移方案的具体内容为：
SIP UA ( User Agent, 用户代理） 向注册服务器发起注册消息， 该消息在经过 ALG ( Application Layer Gateway, 应用层网关） 后 被修改， 增加了 WAN ( Wide Area Network, 广域网） 侧 IP地址， 服 务器根据注册消息建立地址映射关系。
当被叫方发起呼叫转移时， 被叫方需保持住当前会话， 并向主叫 方发起一个 Refer (参考）请求消息， Refer请求消息中 Refer to (参 考值） 字段携带转移接收方的 URL ( Uniform / Universal Resource Locator, 统一资源定位符） 。
主叫方接收到被叫方发起的 Refer请求消息后， 才艮据 Refer to 字段的 URL重新发起一个 SIP请求， 建立一个新的会话， 从而实现呼 叫转移业务。
在实现上述基于 S I P协议的呼叫转移的过程中，发明人发现现有 技术中至少存在如下问题： 基于 S IP协议的呼叫转移过程， 必须经过 ALG , 经过 ALG后的 S IP报文头域将被修改， 降低了网络效率。 进一 步的， 在实现呼叫转移时， 需要依赖 WAN 侧的服务器重新建立一个 S IP会话， 也降低了网络效率。 发明内容 本发明的实施例提供一种媒体转移的方法、装置及系统， 用以提 高网络效率。
为达到上述目的， 本发明的实施例采用如下技术方案： 第一方面， 本发明实施例提供了一种媒体转移的方法， 包括： 获 取本地设备的媒体描述信息；所述媒体描述信息用于指示设备的通信 相关的信息， 包括： 设备的互联网协议 IP地址、 端口号及编解码能 力信息； 其中， 所述本地设备包括： 媒体转移设备和至少一个第一设 备；将获取的所述至少一个第一设备的媒体描述信息与已获取的远端 设备的媒体描述信息进行匹配，根据匹配结果从所述至少一个第一设 备中确定出转移接收设备；将所述媒体转移设备的媒体描述信息及所 述转移接收设备的媒体描述信息发送至网关，以使得所述网关根据所 述媒体转移设备的媒体描述信息及所述转移接收设备的媒体描述信 息更新用于与所述远端设备通信的地址映射表，以便所述网关将所述 远端设备发送的媒体信息转发至所述转移接收设备。
在第一方面的第一种可能的实现方式中， 所述方法还包括： 将所 述远端设备的媒体描述信息发送至所述转移接收设备，以使得所述转 移接收设备根据所述远端设备的媒体描述信息确定所述远端设备的 接收端口的端口号，以便根据所述远端设备的接收端口的端口号检测 接收的媒体信息是否是所述远端设备发送的媒体信息。
结合第一方面或第一方面的第一种可能的实现方式，在第二种可 能的实现方式中， 所述媒体描述信息还包括： 传输协议和 /或媒体格 式。
结合第一方面或第一方面的第一种可能的实现方式或第一方面 的第二种可能的实现方式， 在第三种可能的实现方式中， 在所述获取 本地设备的媒体描述信息之前， 还包括： 接收所述媒体转移设备发送 的业务转移请求消息，所述业务转移请求消息携带所述媒体转移设备 请求进行转移的业务的信息； 检测本地网络， 确定所述本地设备， 获 取所述本地设备的服务描述信息；所述服务描述信息是设备支持的业 务的信息；将所述服务描述信息与所述媒体转移设备进行转移的业务 的信息进行匹配； 所述获取本地设备的媒体描述信息包括： 获取所述 服务描述信息与所述媒体转移设备进行转移的业务的信息相匹配的 本地设备的媒体描述信息。
结合第一方面或第一方面的第一种可能的实现方式或第一方面 的第二种可能的实现方式或第一方面的第三种可能的实现方式，在第 四种可能的实现方式中， 所述获取本地设备的媒体描述信息包括： 通 过获取媒体能力消息获取本地设备的媒体描述信息。
结合第一方面或第一方面的第一种可能的实现方式或第一方面 的第二种可能的实现方式或第一方面的第三种可能的实现方式或第 一方面的第四种可能的实现方式， 在第五种可能的实现方式中， 所述 将所述远端设备的媒体描述信息发送至所述转移接收设备包括：通过 会话建立消息将所述远端设备的媒体描述信息发送至所述转移接收 设备。
结合第一方面或第一方面的第一种可能的实现方式或第一方面 的第二种可能的实现方式，或第一方面的第三种可能的实现方式或第 一方面的第四种可能的实现方式，或第一方面的第五种可能的实现方 式， 在第六种可能的实现方式中， 所述将媒体转移设备的媒体描述信 息及所述转移接收设备的媒体描述信息发送至网关包括：通过会话转 移消息将媒体转移设备的媒体描述信息及所述转移接收设备的媒体 描述信息发送至网关。
第二方面， 本发明实施例提供了一种媒体转移的方法， 包括： 接 收控制点发送的媒体转移设备的媒体描述信息及转移接收设备的媒 体描述信息； 所述媒体描述信息用于指示设备的通信相关的信息， 包 括： 设备的互联网协议 IP地址、 端口号及编解码能力信息； 根据所 述媒体转移设备的媒体描述信息及所述转移接收设备的媒体描述信 息更新用于与远端设备通信的地址映射表；接收远端设备发送的媒体 信息； 根据更新的用于与远端设备通信的地址映射表， 将接收的所述 远端设备发送的媒体信息发送至所述转移接收设备。
在第二方面的第一种可能的实现方式中，所述根据所述媒体转移 设备的媒体描述信息及所述转移接收设备的媒体描述信息更新用于 与所述远端设备通信的地址映射表包括：根据所述媒体转移设备的媒 体描述信息， 将所述地址映射表中存储的所述媒体转移设备的 IP地 址及接收端口的端口号与公网的 IP地址及端口号间的映射关系的表 项删除； 根据所述转移接收设备的媒体描述信息， 建立所述转移接收 设备的 IP地址及接收端口的端口号与公网 IP地址及端口号间的映射 关系， 并存储至所述地址映射表中。
结合第二方面或第二方面的第一种可能的实现方式，在第二种可 能的实现方式中，所述接收控制点发送的媒体转移设备的媒体描述信 息及转移接收设备的媒体描述信息包括：通过会话转移消息接收控制 点发送的媒体转移设备的媒体描述信息及转移接收设备的媒体描述 信息。
结合第二方面或第二方面的第一种可能的实现方式或第二种可 能的实现方式， 在第三种可能的实现方式中， 所述媒体信息包括： 数 据报文头及数据报文体； 所述数据报文头包括： 源 IP地址、 源端口 号、 目的 IP地址及目的端口号； 所述源 IP地址为所述远端设备的 IP 地址； 源端口号为所述远端设备的接收端口的端口号； 所述目的 IP地址为公网的 IP地址； 所述目的端口号为公网的端口号； 所述才艮 据更新的用于与远端设备通信的地址映射表，将接收的所述远端设备 发送的媒体信息发送至转移接收设备包括：根据所述媒体信息的所述 数据报文头的目的 IP地址及目的端口号查找更新的所述用于与远端 设备通信的地址映射表， 确定转移接收设备的 IP地址及接收端口的 端口号； 根据所述转移接收设备的 I P地址及接收端口的端口号， 将 所述媒体信息发送至所述转移接收设备。
结合第二方面的第三种可能的实现方式，在第四种可能的实现方 式中， 在所述根据所述转移接收设备的 IP地址及端口号， 将所述媒 体信息发送至所述转移接收设备之前， 还包括： 将所述媒体信息的数 据报文头的目的 IP地址及目的端口号修改为转移接收设备的 IP地址 及接收端口的端口号； 所述根据所述转移接收设备的 IP地址及接收 端口的端口号， 将所述媒体信息发送至所述转移接收设备包括： 根据 所述转移接收设备的 IP地址及接收端口的端口号， 将所述修改了数 据报文头的目的 IP地址及目的端口号的媒体信息发送至所述转移接 收设备。
第三方面， 本发明实施例提供了一种媒体转移的方法， 包括： 向 控制点发送媒体描述信息，以使得所述控制点在接收到所述媒体描述 信息后，将所述媒体描述信息与已获取的远端设备的媒体描述信息进 行匹配，在所述媒体描述信息与已获取的远端设备的媒体描述信息相 匹配的情况下， 则将所述媒体描述信息发送至网关， 以便所述网关根 据所述媒体描述信息及所述控制点发送的媒体转移设备的媒体描述 信息更新用于与所述远端设备通信的地址映射表，以便所述网关将所 述远端设备发送的媒体信息转发至所述转移接收设备；所述媒体描述 信息用于指示设备的通信相关的信息， 包括： 设备的互联网协议 I P 地址、 端口号及编解码能力信息； 接收所述网关转发的来自所述远端 设备的媒体信息。
在第三方面的第一种可能的实现方式中，在所述接收所述网关转 发的来自所述远端设备的媒体信息之前， 还包括： 接收所述控制点发 送的远端设备的媒体描述信息；根据所述远端设备的媒体描述信息确 定所述远端设备的接收端口的端口号，以便根据所述远端设备的接收 端口的端口号检测接收的媒体信息是否是所述远端设备发送的媒体 信息。
结合第三方面的第一种可能的实现方式，在第二种可能的实现方 式中， 接收所述控制点发送的远端设备的媒体描述信息包括： 通过会 话建立消息接收所述控制点发送的远端设备的媒体描述信息。
结合第三方面的第一种可能的实现方式或第三方面的第二种可 能的实现方式， 在第三种可能的实现方式中， 所述媒体信息包括： 数 据报文头及数据报文体； 所述数据报文头包括： 源 IP地址、 源端口 号、 目的 IP地址及目的端口号； 所述源 IP地址为所述远端设备的 IP 地址； 所述源端口号为所述远端设备的接收端口的端口号； 所述 目的 IP地址为转移接收设备的 IP地址；所述目的端口号为所述转移 接收设备的接收端口的端口号；在所述接收所述网关转发的来自所述 远端设备的媒体信息之后， 还包括： 检测所述媒体信息的所述数据报 文头中的源端口号与根据所述远端设备的媒体描述信息所确定的所 述远端设备的接收端口的端口号是否相同；若检测出所述数据报文头 中的源端口号与所述远端设备的接收端口的端口号不相同，则丟弃所 述媒体信息；若检测出所述数据报文头中的源端口号与所述远端设备 的接收端口的端口号相同， 则处理所述媒体信息。
结合第三方面或第三方面的第一种可能的实现方式或第三方面 的第二可能的实现方式或第三方面的第三可能的实现方式，在第四种 可能的实现方式中， 所述向控制点发送媒体描述信息包括： 向控制点 发送获取媒体能力响应消息，所述获取媒体能力响应消息中携带有所 述媒体描述信息。
第四方面， 本发明实施例提供了一种媒体转移的方法， 包括： 接 收控制点发送的获取媒体能力消息； 向控制点发送媒体描述信息， 以 使得在所述控制点在确定出转移接收设备的情况下，将所述媒体描述 信息及所述转移接收设备的媒体描述信息发送至网关，以便所述网关 根据所述媒体描述信息及所述转移接收设备的媒体描述信息更新用 于与远端设备通信的地址映射表，以便所述网关将所述远端设备发送 的媒体信息转发至所述转移接收设备；所述媒体描述信息用于指示设 备的通信相关的信息， 包括： 设备的互联网协议 IP地址、 端口号及 编解码能力信息。
在第四方面的第一种可能的实现方式中，在所述向控制点发送媒 体描述信息之前， 还包括： 向所述控制点发送业务转移请求消息， 所 述业务转移请求消息携带所述媒体转移设备请求进行转移的业务的 信息。
第五方面， 本发明实施例提供了一种控制点， 包括： 获取单元， 用于获取本地设备的媒体描述信息；所述媒体描述信息用于指示设备 的通信相关的信息， 包括： 设备的互联网协议 IP地址、 端口号及编 解码能力信息； 其中， 所述本地设备包括： 媒体转移设备和至少一个 第一设备； 处理单元， 用于将所述获取单元获取的所述至少一个第一 设备的媒体描述信息与已获取的远端设备的媒体描述信息进行匹配， 根据匹配结果从所述至少一个第一设备中确定出转移接收设备；收发 单元，用于将所述媒体转移设备的媒体描述信息及所述转移接收设备 的媒体描述信息发送至网关，以使得所述网关根据所述媒体转移设备 的媒体描述信息及所述转移接收设备的媒体描述信息更新用于与所 述远端设备通信的地址映射表，以便所述网关将所述远端设备发送的 媒体信息转发至所述转移接收设备。
在第五方面的第一种可能的实现方式中， 所述收发单元， 还用于 将所述远端设备的媒体描述信息发送至所述处理单元确定的所述转 移接收设备，以使得所述转移接收设备根据所述远端设备的媒体描述 信息确定远端设备的接收端口的端口号，以便根据所述远端设备的接 收端口的端口号检测接收的媒体信息是否是所述远端设备发送的媒 体信息。
结合第五方面或第五方面的第一种可能的实现方式，在第二种可 能的实现方式中， 还包括： 所述收发单元， 还用于接收所述媒体转移 设备发送的业务转移请求消息，所述业务转移请求消息携带所述媒体 转移设备请求进行转移的业务的信息；检测单元，用于检测本地网络， 确定所述本地设备； 所述获取单元， 还用于获取所述检测单元确定的 所述本地设备的服务描述信息；所述服务描述信息是设备支持的业务 的所述服务描述信息与所述媒体转移设备进行转移的业务的信息进 行匹配； 所述获取单元具体根据所述处理单元匹配的匹配结果， 获取 所述服务描述信息与所述媒体转移设备进行转移的业务的信息相匹 配的本地设备的媒体描述信息。
结合第五方面或第五方面的第一种可能的实现方式或第五方面 的第二种可能的实现方式， 在第三种可能的实现方式中， 所述获取单 元具体通过获取媒体能力消息获取本地设备的媒体描述信息。
结合第五方面或第五方面的第一种可能的实现方式或第五方面 的第二种可能的实现方式或第五方面的第三种可能的实现方式，在第 四种可能的实现方式中，所述收发单元具体通过会话建立消息将所述 远端设备的媒体描述信息发送至所述转移接收设备。
结合第五方面或第五方面的第一种可能的实现方式或第五方面 的第二种可能的实现方式或第五方面的第三种可能的实现方式或第 五方面的第四种可能的实现方式， 在第四种可能的实现方式中， 所述 收发单元具体通过会话转移消息将所述媒体转移设备的媒体描述信 息及所述转移接收设备的媒体描述信息发送至网关。
第六方面， 本发明实施例提供了一种网关， 包括： 收发单元， 用 于接收控制点发送的媒体转移设备的媒体描述信息及转移接收设备 的媒体描述信息； 所述媒体描述信息用于指示设备的通信相关的信 息， 包括： 设备的互联网协议 IP地址、 端口号及编解码能力信息； 更新单元，用于根据所述收发单元接收的所述媒体转移设备的媒体描 述信息及所述转移接收设备的媒体描述信息更新用于与远端设备通 信的地址映射表； 所述收发单元， 还用于接收远端设备发送的媒体信 息； 所述收发单元， 还用于根据所述更新单元更新的用于与远端设备 通信的地址映射表，将接收的所述远端设备发送的媒体信息发送至所 述转移接收设备。
在第六方面的第一种可能的实现方式中， 所述更新单元具体用 于， 根据所述收发单元接收的所述媒体转移设备的媒体描述信息， 将 所述地址映射表中存储的所述媒体转移设备的 IP地址及接收端口的 端口号与公网的 IP地址及端口号间的映射关系的表项删除； 根据所 述收发单元接收的所述转移接收设备的媒体描述信息，建立所述转移 接收设备的 IP地址及接收端口的端口号与公网 IP地址及端口号间的 映射关系， 并存储至所述地址映射表中。
结合第六方面或第六方面的第一种可能的实现方式，在第二种可 能的实现方式中，所述收发单元具体通过会话转移消息接收控制点发 送的媒体转移设备的媒体描述信息及转移接收设备的媒体描述信息。
结合第六方面或第六方面的第一种可能的实现方式或第六方面 的第二种可能的实现方式， 在第三种可能的实现方式中， 所述媒体信 息包括： 数据报文头及数据报文体； 所述数据报文头包括： 源 IP地 址、 源端口号、 目的 IP地址及目的端口号； 所述源 IP地址为所述远 端设备的 IP地址； 源端口号为所述远端设备的接收端口的端口号； 所述目的 IP地址为公网的 IP地址；所述目的端口号为公网的端口号； 所述收发单元包括： 查找子单元， 用于根据接收的所述媒体信息的所 述数据报文头的目的 IP地址及目的端口号查找所述更新单元更新的 所述用于与所述远端设备通信的地址映射表， 确定转移接收设备的
IP 地址及接收端口的端口号； 收发子单元， 用于根据所述查找子单 元确定的所述转移接收设备的 IP地址及接收端口的端口号， 将所述 媒体信息发送至所述转移接收设备。
结合第六方面的第三种可能的实现方式，在第四种可能的实现方 式中， 所述更新单元， 还用于将所述媒体信息的所述数据报文头的目 的 IP地址及目的端口号更新为转移接收设备的 IP地址及接收端口的 端口号； 所述收发子单元具体用于， 根据所述查找子单元确定的所述 转移接收设备的 IP地址及接收端口的端口号， 将所述更新单元更新 后的媒体信息发送至所述转移接收设备。
第七方面， 本发明实施例提供了一种转移接收设备， 包括： 收发 单元， 用于向控制点发送媒体描述信息， 以使得所述控制点在接收到 所述媒体描述信息后，将所述媒体描述信息与已获取的远端设备的媒 体描述信息进行匹配，在所述媒体描述信息与已获取的远端设备的媒 体描述信息相匹配的情况下， 则将所述媒体描述信息发送至网关， 以 便所述网关根据所述媒体描述信息及所述控制点发送的媒体转移设 备的媒体描述信息更新用于与所述远端设备通信的地址映射表，以便 所述网关将所述远端设备发送的媒体信息转发至所述转移接收设备； 所述媒体描述信息用于指示设备的通信相关的信息， 包括： 设备的互 联网协议 IP地址、 端口号及编解码能力信息； 所述收发单元， 还用 于接收网关转发的来自所述远端设备的媒体信息。
在第七方面的第一种可能的实现方式中， 所述收发单元， 还用于 接收所述控制点发送的远端设备的媒体描述信息；所述转移接收设备 还包括： 处理单元， 用于根据所述收发单元接收的所述远端设备的媒 体描述信息确定所述远端设备的接收端口的端口号，以便根据所述远 端设备的接收端口的端口号检测接收的媒体信息是否是所述远端设 备发送的媒体信息。
结合第七方面的第一种可能的实现方式，在第二种可能的实现方 式中，所述收发单元具体通过会话建立消息接收所述控制点发送的远 端设备的媒体描述信息。
结合第七方面的第一种可能的实现方式或第七方面的第二种可 能的实现方式， 在第三种可能的实现方式中， 所述媒体信息包括： 数 据报文头及数据报文体； 所述数据报文头包括： 源 IP地址、 源端口 号、 目的 IP地址及目的端口号； 所述源 IP地址为所述远端设备的 IP 地址； 源端口号为所述远端设备的接收端口的端口号； 所述目的 IP地址为转移接收设备的 IP地址； 所述目的端口号为所述转移接收 设备的接收端口的端口号； 所述处理单元， 还用于检测所述收发单元 接收的所述媒体信息的所述数据报文头中的源端口号与根据所述远 端设备的媒体描述信息所确定的所述远端设备的接收端口的端口号 是否相同；在检测出所述数据报文头中的源端口号与所述远端设备的 接收端口的端口号不相同的情况下， 丟弃所述媒体信息； 在检测出所 述数据报文头中的源端口号与所述远端设备的接收端口的端口号相 同的情况下， 处理所述媒体信息。
结合第七方面或第七方面的第一种可能的实现方式或第七方面 的第二种可能的实现方式或第七方面的第三种可能的实现方式，在第 四种可能的实现方式中，所述收发单元具体通过向控制点发送获取媒 体能力响应消息来向所述控制点发送媒体描述信息，所述获取媒体能 力响应消息中携带有所述媒体描述信息。
第八方面， 本发明实施例提供了一种媒体转移设备， 包括： 收发 单元， 用于接收控制点发送的获取媒体能力消息； 所述收发单元， 还 用于向控制点发送媒体描述信息，以使得在所述控制点在确定出转移 接收设备的情况下，将所述媒体描述信息及所述转移接收设备的媒体 描述信息发送至网关，以便所述网关根据所述媒体描述信息及所述转 移接收设备的媒体描述信息更新用于与远端设备通信的地址映射表， 以便所述网关将所述远端设备发送的媒体信息转发至所述转移接收 设备； 所述媒体描述信息用于指示设备的通信相关的信息， 包括： 设 备的互联网协议 IP地址、 端口号及编解码能力信息。
在第八方面的第一种可能的实现方式中， 所述收发单元， 还用于 在向控制点发送媒体描述信息之前，向所述控制点发送业务转移请求 消息，所述业务转移请求消息携带所述媒体转移设备请求进行转移的 业务的信息。
第九方面， 本发明实施例提供了一种媒体转移的系统， 包括： 媒 体转移设备， 转移接收设备， 控制点， 网关； 其中， 所述控制点为上 述实施例提供的一种控制点； 所述网关为上述实施例提供的一种网 关； 所述转移接收设备为上述实施例提供的一种转移接收设备。
本发明实施例提供了一种媒体转移的方法、装置及系统， 控制点 通过获取本地设备的媒体描述信息，将获取的本地设备的媒体描述信 息与已获取的远端设备的媒体描述信息进行匹配，根据匹配结果确定 出转移接收设备。向网关发送转移接收设备的媒体描述信息及媒体转 移设备的媒体描述信息，以使得网关根据转移接收设备的媒体描述信 息及媒体转移设备的媒体描述信息更新地址映射表。 这样， 网关接收 到远端设备发送的媒体信息时，根据更新的地址映射表可以确定出应 接收远端设备发送的媒体信息的转移接收设备，并将媒体信息发送至 转移接收设备。实现远端设备与媒体转移设备的通信转移至远端设备 与转移接收设备的通信时，无需更改与网络侧远端设备间建立的通信 链接， 提高了网络效率。 并且， 远端设备发送的媒体信息， 在网络侧 传输时， 没有被更改， 从而进一步提高了网络效率。 附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案，下面 将对实施例或现有技术描述中所需要使用的附图作筒单地介绍，显而 易见地， 下面描述中的附图仅仅是本发明的一些实施例， 对于本领域 普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些 附图获得其他的附图。
图 1为本发明实施例提供的一种媒体转移的方法示意图； 图 2为本发明实施例提供的另一种媒体转移的方法示意图； 图 3为本发明实施例提供的另一种媒体转移的方法示意图； 图 4为本发明实施例提供的另一种媒体转移的方法示意图； 图 5为本发明实施例提供的另一种媒体转移的方法示意图； 图 6 为本发明实施例提供的一种媒体转移之前的设备间通信的 方法示意图；
图 7为本发明实施例提供的另一种媒体转移的方法示意图； 图 8 为本发明实施例提供的一种媒体转移之后的设备间通信的 方法示意图；
图 9为本发明实施例提供的一种控制点的结构示意图；
图 10为本发明实施例提供的另一种控制点的结构示意图； 图 11为本发明实施例提供的一种网关的结构示意图；
图 12为图 11所示的收发单元的结构示意图；
图 1 3为本发明实施例提供的一种转移接收设备的结构示意图； 图 14为本发明实施例提供的一种媒体转移设备的结构示意图； 图 15为本发明实施例提供的另一种控制点的结构示意图； 图 16为本发明实施例提供的另一种网关的结构示意图； 图 17 为本发明实施例提供的另一种转移接收设备的结构示意 图；
图 18 为本发明实施例提供的另一种媒体转移设备的结构示意 图；
图 19 为本发明实施例提供的一种媒体转移的系统的结构示意 图。 具体实肺式 下面将结合本发明实施例中的附图，对本发明实施例中的技术方 案进行清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部 分实施例， 而不是全部的实施例。 基于本发明中的实施例， 本领域普 通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
本发明实施例提供了一种媒体转移的方法， 如图 1所示， 包括： 101、 获取本地设备的媒体描述信息。
其中， 所述媒体描述信息用于指示设备的通信相关的信息， 可以 包括： 设备的 IP ( Int erne t Pro t oco l , 互联网十办议） 地址、 端口号 及编解码能力信息。 所述本地设备包括： 媒体转移设备和至少一个第 一设备。 需要说明的是， 本地设备是指控制点管理的设备。 所述媒体转移 设备是指本地设备中，要进行媒体转移的设备。 第一设备是指本地设 备中， 除媒体转移设备之外的设备。
进一步的， 所述媒体描述信息还可以包括： 传输协议和 /或媒体 格式。
需要说明的是，媒体描述信息还可包括其他信息， 本发明对此不 做限制。
需要说明的是，媒体描述信息中的端口号是设备用于接收其他设 备发送的媒体信息的端口号。
其中， 获取本地设备的媒体描述信息包括： 获取媒体转移设备的 媒体描述信息及至少一个第一设备的媒体描述信息。
具体的， 控制点 （Control Point ) 可以向本地设备发送获取媒 体描述信息的消息， 接收本地设备返回的媒体描述信息， 获取本地设 备各自的媒体描述信息。
可 选 的 ， 控 制 点 可 以 通 过 获 取 媒 体 能 力 消 息
( GetMediaCapabilities ) 获取本地设备的媒体描述信息。
控制点可以通过 HTTP ( hypertext transport protocol , 超文 本传送协议） 的 POST (通知） 方法获取本地设备的媒体描述信息， 具体信令如下：
控制点-〉本地设备：
P0ST/_urn: upnp-org: serviceld: Med iaManagement _cont rol HTTP/1.1
S0APACTI0N: "urn: schemas-upnporg:
service: Med iaManagement: l#GetMediaCapabi 1 i t i e s "
CONTENT-TYPE: text/xml ； char set="utf -8 "
HOST: 192.168.1.21: 10021
Content-Length: [bytes in body]
<?xml vers ion=" 1.0" encoding="utf-8 "？ >
<s: Enve lope
s: encodingSty le="ht tp: II schema s. xml soap, org/soap/encoding/" xmlns: s = "ht tp: II schema s. xml soap, org/ soap/ envelope/ " > <s: Body>
<u: GetMediaCapabilities
xmlns: u="urn: schema s-upnp-org: service: MediaManagement: 1 "
>
<TSMediaCapabilityInfoX/TSMediaCapabilityInfo>
</u: GetMediaCapabilities >
</s: Body>
</ s: Enve lope>。
控制点接收到本地设备返回的包含媒体描述信息的 HTTP响应消 息， HTTP响应消息的具体信令如下：
本地设备-〉控制点：
HTTP/1.1 200 0K
EXT:
CONTENT-TYPE: text/xml ； char set="utf -8 "
SERVER: Windows NT/5.0, UPnP/1.0, Intel CLR SDK/1.0
Content-Length: [bytes in body]
<?xml vers ion=" 1.0" encoding="utf-8 "？ >
<s: Enve lope
s: encodingSty le="ht tp: II schema s. xml soap, org/soap/encoding/" xmlns: s = "ht tp: II schema s. xml soap. org/ soap/ envelope/ " > <s: Body>
<u: GetMediaCapabi lit iesResponse
xmlns: u="urn: schemas-upnporg:
service: MediaManagement: 1 " >
<Suppor tedMediaCapabi 1 i ty Inf O>&1 t ; ?xml ver s ion=" 1.0" encoding="utf_8"?&gt;
&lt;mms:mediaCapabilityInfo
xs i: schemaLocat ion="urn: schema s-upnp-org: phone: mms ht tp: I /www. upnp. org/ schema s/ phone/mms-vl. xsd"
xmlns: xs i = "ht tp: II www. w3. org/ 2001/XMLSchema-ins tance " xmlns: cams = "urn: schema s-upnp-org: phone: mms"&gt;
&lt; mediaCapability f ormat = " SDP" &gt; v=0
o=- 0 0 IN IP4 192.168.1.21
s=- c=IN IP4 192.168.1.21
t = 0 0
m=audio 11021 RTP/AVP 0
c=IN IP4 192.168.1.21
a=rtpmap: 0 PCMU/8000
a=pt ime: 20
m=video 12021 RTP/AVP 96
c=IN IP4 192.168.1.21
b=AS: 2500
a=rtpmap: 96 MP4V-ES/90000
a=fmtp: 96 prof i le-leve 1 id=
4; config=000001b004000001b50900000100000001200086c40fa2 8a021e0a21
a=f ramerate: 30
&lt; /mediaCapability&gt; & lt; /mms:mediaCapabilityInfo&gt
</Suppor tedMed iaCapabi 1 i ty Inf o>
</u: Ge t Med iaCapabi lit iesResponse>
</s: Body>
</ s: Enve lope>。
需要说明的是， 在本发明所有实施例中，控制点可以集成在本地 设备中。 若控制点集成在某个本地设备中， 此时， 控制点中存储了集 成此控制点的本地设备的媒体描述信息，所以控制点在获取本地设备 的媒体描述信息时，可以获取没有集成此控制点的其他本地设备的媒 体描述信息。 例如， 控制点可以集成在媒体转移设备中， 由于控制点 已经获知了媒体转移设备的媒体描述信息，则控制点获取第一设备的 媒体描述信息。 控制点也可以不集成在任何一个设备中， 而是单独的 设备， 此时控制点获取本地设备中所有设备的媒体描述信息。
1 02、 将获取的所述至少一个第一设备的媒体描述信息与已获取 的远端设备的媒体描述信息进行匹配，根据匹配结果从所述至少一个 第一设备中确定出转移接收设备。
其中， 所述远端设备是与媒体转移设备进行通信的网络侧设备。 所述转移接收设备是指在本地设备中，要与媒体转移设备进行媒体转 移的设备。
需要说明的是， 在媒体转移设备与远端设备进行通信时，控制点 已获取了远端设备的媒体描述信息。
具体的， 控制点在获取了本地设备的媒体描述信息后， 根据预先 获取的远端设备的媒体描述信息，将本地设备中的至少一个第一设备 的媒体描述信息与预先获取的远端设备的媒体描述信息进行匹配，根 据匹配结果确定出转移接收设备。
例如，控制点将本地设备中的至少一个第一设备的媒体描述信息 的传输协议、媒体格式、 编解码能力信息与预存的远端设备的媒体描 述信息的传输协议、 媒体格式、 编解码能力信息进行匹配， 若本地设 备的某个第一设备的媒体描述信息的传输协议、媒体格式、 编解码能 力信息与预存的远端设备的媒体描述信息的传输协议、媒体格式、 编 解码能力信息相匹配， 则将此第一设备确定为转移接收设备。
在控制点只获取了媒体转移设备和一个第一设备的情况下，若此 第一设备的媒体描述信息与远端设备的媒体描述信息相匹配，则将此 第一设备确定为转移接收设备。
若此第一设备的媒体描述信息与远端设备的媒体描述信息不匹 配， 则控制点生成媒体转移失败消息， 可以通过媒体转移设备反馈至 用户。
在控制点获取了媒体转移设备和至少两个第一设备的情况下，若 所述至少两个第一设备中有至少两个第一本地设备 ,则将所述至少两 个第一本地设备中的一个第一本地设备确定为转移接收设备。
需要说明的是，所述第一本地设备是指媒体描述信息与远端设备 的媒体描述信息相匹配的第一设备。
其中，控制点将至少两个第一本地设备中的一个第一本地设备确 定为转移接收设备的方法，可以是控制点将至少两个第一本地设备反 馈至用户， 由用户进行选择后， 将用户选择的第一本地设备确定为转 移接收设备。也可以是控制点任意选择一个第一本地设备作为转移接 收设备。
需要说明的是，控制点将至少两个第一本地设备中的一个第一本 地设确定为转移接收设备的方法， 还可是其他方法， 本发明对此不做 限制。
可选的， 控制点根据匹配结果， 可以将至少一个第一本地设备生 成将当前媒体转移业务转移到本地设备的选择列表。在选择列表中选 择一个本地设备作为转移接收设备。
103、 将所述媒体转移设备的媒体描述信息及所述转移接收设备 的媒体描述信息发送至网关，以使得所述网关根据所述媒体转移设备 的媒体描述信息及所述转移接收设备的媒体描述信息更新用于与所 述远端设备通信的地址映射表，以便所述网关将所述远端设备发送的 媒体信息转发至所述转移接收设备。
具体的， 控制点可以通过会话转移消息 （ SessionTransfer ) 将 所述媒体转移设备的媒体描述信息及所述转移接收设备的媒体描述 信息发送至网关。
示例性的， 若媒体转移设备为 phone (手机） ， 转移接收设备为 TV ( Television, 电视） ， phone要进行转移的媒体转移业务为视频 会话，则远端的媒体描述信息可以是与语音或视频相关的信息。此时， 控制点将 phone的媒体描述信息及 TV的媒体描述信息通过会话转移 消息 （SessionTransfer ) , 利用 HTTP的 POST方法发送至网关， 具 体信令如下：
控制点-〉网关：
POST / _urn: upnp-or g: serviceld: Ca 1 IManagement _cont ro 1 HTTP/1.1 S0APACTI0N:
"urn: schema s-upnp-org: service: Ca 1 IManagement: l#SessionTransf erM
CONTENT-TYPE: text/xml ； char set="utf -8 "
HOST: 192.168.1.1: 10001
Content-Length: [bytes in body]
<?xml vers ion=" 1.0" encoding="utf-8 "？ >
<s: Enve lope
s: encodingSty le="ht tp: II schema s. xml soap, org/soap/encoding/" xmlns: s = "ht tp: II schema s. xml soap, org/ soap/ envelope/ " > <s: Body>
<u: SessionTransfer xmlns: u="urn: schema s-upnp-org: service: Cal IManagement: 1 " >
<TelCPNameX/TelCPName>
<SecretKeyX/SecretKey>
<MediaCapabilityInfo— Transfer >& 11 ; ? xm 1 version="l.0" encoding="utf_8"?&gt;
&lt; cams:mediaCapabilityInfo
xs i: schemaLocat ion="urn: schema s-upnp-org: phone: cams ht tp: I /www. upnp. org/ schema s/ phone/ cams -vl. xsd"
xmlns: xs i = "ht tp: II www. w3. org/ 2001/XMLSchema-ins tance " xmlns: cams = "urn: schema s-upnp-org: phone: cams"&gt;
&lt; mediaCapability f ormat = " SDP" &gt; v=0
o=- 0 0 IN IP4 192.168.1.2
s=- c=IN IP4 192.168.1.2
t = 0 0
m=audio 11021 RTP/AVP 0
c=IN IP4 192.168.1.2 a=rtpmap: 0 PCMU/8000
a=pt ime: 20
&lt; /mediaCapabi 1 i ty&gt;
&11; / cams: mediaCapabi 1 i tylnf o&gt ; </MediaCapabilityInfo_ Transfer>
<MediaCapabilityInfo— Transfered>& 11 ; ? xm 1 version="l.0" encoding="utf_8"?&gt;
&lt; cams:mediaCapabilityInfo
xs i: schemaLocat ion="urn: schema s-upnp-org: phone: cams ht tp: I /www. upnp. org/ schema s/ phone/ cams -vl. xsd"
xmlns: xs i = "ht tp: II www. w3. org/ 2001/XMLSchema-ins tance " xmlns: cams = "urn: schema s-upnp-org: phone: cams"&gt;
&lt; mediaCapability f ormat = " SDP" &gt; v=0
o=- 0 0 IN IP4 192.168.1.3
s=- c=IN IP4 192.168.1.3
t = 0 0
m=audio 11021 RTP/AVP 0
c=IN IP4 192.168.1.3
a=rtpmap: 0 PCMU/8000
a=pt ime: 20
&lt; /mediaCapabi 1 i ty&gt;
&11; / cams: mediaCapabi 1 i tylnf o&gt; </MediaCapabilityInfo_ Transfered>
</u: Sess ionTransf er >
</s: Body>
</ s: Enve lope>。
本发明实施例提供了一种媒体转移的方法，控制点通过获取本地 设备的媒体描述信息，将获取的本地设备的媒体描述信息与已获取的 远端设备的媒体描述信息进行匹配，根据匹配结果确定出转移接收设 备。向网关发送转移接收设备的媒体描述信息及媒体转移设备的媒体 描述信息，以使得网关根据转移接收设备的媒体描述信息及媒体转移 设备的媒体描述信息更新地址映射表。 这样， 使得网关在接收到远端 设备发送的媒体信息时，根据更新的地址映射表可以确定出应接收远 端设备发送的媒体信息的转移接收设备，并将媒体信息发送至转移接 收设备。实现远端设备与媒体转移设备的通信转移至远端设备与转移 接收设备的通信时， 无需更改与网络侧远端设备间建立的通信链接， 提高了网络效率。并且，远端设备发送的媒体信息，在网络侧传输时， 没有被更改， 从而进一步提高了网络效率。
本发明实施例提供了一种媒体转移的方法， 如图 2所示， 包括：
201、 接收控制点发送的媒体转移设备的媒体描述信息及转移接 收设备的媒体描述信息。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 所述本地设备的互联网协议 IP地址、 端口号及编解码能力信息。
所述转移接收设备是在本地设备中，要与媒体转移设备进行媒体 转移的设备。 所述媒体转移设备是指要进行媒体转移的设备。 所述远 端设备是与媒体转移设备进行通信的网络侧设备。
进一步的， 所述媒体描述信息还包括： 媒体格式和 /或传输协议。 具体的， 网关可以通过会话转移消息 （ Se s s i onTrans fer ) 接收 控制点发送的媒体转移设备的媒体描述信息及所述转移接收设备的 媒体描述信息。
202、 根据所述媒体转移设备的媒体描述信息及所述转移接收设 备的媒体描述信息更新用于与远端设备通信的地址映射表。
具体的， 网关可以根据所述媒体转移设备的媒体描述信息， 将所 述地址映射表中存储的所述媒体转移设备的 IP地址及接收端口的端 口号与公网的 IP地址及端口号间的映射关系的表项删除。 根据所述 转移接收设备的媒体描述信息， 建立所述转移接收设备的 IP地址及 接收端口的端口号与公网 IP地址及端口号间的映射关系， 并存储至 所述地址映射表中。
如上例所述， 网关的内网侧的内网 I P地址是 192. 168. 1. 1 , 公 共网侧的公共 IP地址是 10.11.20.240。网关内网侧的本地设备的 IP 地址通过 DHCP ( Dynamic Host Configuration Protocol , 动态主机 设置协议）获取。 其中，媒体转移设备为 phone, 转移接收设备为 TV phone的媒体描述信息包括： phone的 IP地址为 192.168.1.2, phone 的接收端口的端口号为 5060 TV的媒体描述信息包括： TV的 IP地 址为 192.168.1.3, TV的接收端口的端口号为 5060
网关根据 phone的 IP地址及接收端口的端口号， 建立的 phone 的 IP地址及接收端口的端口号与公网 IP地址及端口号间的映射关 系， 作为地址映射表的一个表项， 存储在地址映射表中。 如下表 1 所示。
表 1 (地址映射表）
Figure imgf000023_0001
网关接收到控制点发送的 phone及 TV的媒体描述信息， 则网关 根据 phone的媒体描述信息中 phone的 IP地址及接收端口的端口号， 查找地址映射表， 并将地址映射表中与 phone的 IP地址及接收端口 的端口号相匹配的一项删除，并根据 TV的媒体描述信息中的 IP地址 及接收端口的端口号，建立 TV的 IP地址及接收端口的端口号与公网 IP地址及端口号间的映射关系， 并将新建立的 TV的 IP地址及接收 端口的端口号与公网 IP地址及端口号间的映射关系作为地址映射表 的一个表项存储至地址映射表中， 如下表 2所示。
表 2 (地址映射表）
Figure imgf000023_0002
203、 接收远端设备发送的媒体信息。 具体的， 网关接收远端设备发送的媒体信息。 其中， 媒体信息中 包括： 数据报文头和数据报文体。媒体转移设备发送的媒体信息的数 据报文头包括： 源 IP地址， 源端口号， 目的 IP地址， 目的端口号。
其中， 远端设备发送的媒体信息的数据报文头中的源 IP地址为 远端设备的 IP地址， 源端口号为远端设备的接收端口的端口号， 目 的 IP地址为网关的 IP地址， 目的端口号为网关的端口号。
如上例所述， 网关的公共网侧的公共 IP地址是 1 0. 11. 20. 240 , 端口号是 1234。 ^叚设远端设备的 IP地址为 173. 194. 64. 147 , 远端设 备的接收端口的端口号为 6060 , 则在网关接收的远端设备发送的媒 体信息中的数据报文头中的源 IP地址为 173. 194. 64. 147 , 源端口号 为 6060 , 目的 IP地址为 10. 1 1. 20. 240 , 目的端口号为 1234。
204、 根据更新的用于与远端设备通信的地址映射表， 将接收的 所述远端设备发送的媒体信息发送至所述转移接收设备。
具体的， 网关接收到远端设备发送的媒体信息后， 解析出媒体信 息中的数据报文头， 根据数据报文头中的目的 IP地址及目的端口号 查找更新后的用于与远端设备通信的地址映射表，从而获取到转移接 收设备的 IP地址及端口号。根据获取的转移接收设备的 IP地址及端 口号， 将接收到的远端设备发送的媒体信息发送至媒体转移设备。
如上例所述， 网关接收到远端设备发送的媒体信息， 解析出媒体 信息中的数据报文头中的源 IP地址为 173. 194. 64. 147 , 源端口号为 6060 , 目的 IP地址为 10. 1 1. 20. 240 , 目的端口号为 1234 , 才艮据目的 IP地址为 1 0. 11. 20. 240 , 目的端口号为 1234查找地址映射表， 参考 表 2 , 查找到 IP地址为 10. 11. 20. 240 , 端口号为 1234 , 对应的转移 接收设备的 IP地址为 192. 168. 1. 3 , 端口号为 5060 , 则网关根据查 找的到 IP地址为 192. 168. 1. 3 , 端口号为 5060 , 将媒体信息发送至 转移接收设备。
本发明实施例提供了一种媒体转移的方法，网关接收转移接收设 备的媒体描述信息及媒体转移设备的媒体描述信息，并根据转移接收 设备的媒体描述信息及媒体转移设备的媒体描述信息更新地址映射 表。 这样， 使得网关在接收到远端设备发送的媒体信息时， 根据更新 的地址映射表可以确定出应接收远端设备发送的媒体信息的转移接 收设备， 并将媒体信息发送至转移接收设备。 实现远端设备与媒体转 移设备的通信转移至远端设备与转移接收设备的通信时，无需更改与 网络侧远端设备间建立的通信链接， 提高了网络效率。 并且， 远端设 备发送的媒体信息， 在网络侧传输时， 没有被更改， 从而进一步提高 了网络效率。
本发明实施例提供了一种媒体转移的方法， 如图 3所示， 包括：
301、 向控制点发送媒体描述信息， 以使得所述控制点在接收到 所述媒体描述信息后，将所述媒体描述信息与已获取的远端设备的媒 体描述信息进行匹配，在所述媒体描述信息与已获取的远端设备的媒 体描述信息相匹配的情况下， 则将所述媒体描述信息发送至网关， 以 便所述网关根据所述媒体描述信息及所述控制点发送的媒体转移设 备的媒体描述信息更新用于与所述远端设备通信的地址映射表，以便 所述网关将所述远端设备发送的媒体信息转发至所述转移接收设备。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 所述本地设备的互联网协议 IP地址、 端口号及编解码能力信息。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 转移接收设备可以向控制点发送获取媒体能力响应消 息， 所述获取媒体能力响应消息中携带有媒体描述信息。 也就是说， 转移接收设备在接收到控制点发送的获取媒体能力 消 息 ( Ge tMed i aCapab i l i t i e s )后， 将转移接收设备的媒体描述信息添加 至获取媒体能力响应消息中，并将获取媒体能力响应消息发送至控制 点。
302、 接收所述网关转发的来自所述远端设备的媒体信息。
具体的， 在网关更新完用于与所述远端设备通信的地址映射表 后， 在网关接收到远端设备发送的媒体信息后， 网关查找更新后的地 址映射表， 获取到转移接收设备的 I P地址及端口号， 根据转移接收 设备的 IP地址及端口号将远端设备发送的媒体信息发送至转移接收 设备， 转移接收设备接收网关转发的远端设备发送的媒体信息。
本发明实施例一种媒体转移的方法，转移接收设备向控制点发送 媒体描述信息， 使得所述控制点在接收到所述媒体描述信息后， 将所 述媒体描述信息与已获取的远端设备的媒体描述信息进行匹配，在所 述媒体描述信息与已获取的远端设备的媒体描述信息相匹配的情况 下， 则将所述媒体描述信息发送至网关， 以便所述网关根据所述媒体 描述信息及所述控制点发送的媒体转移设备的媒体描述信息更新用 于与所述远端设备通信的地址映射表，以便所述网关将所述远端设备 发送的媒体信息转发至所述转移接收设备。 这样， 转移接收设备通过 网关接收远端设备发送的媒体信息，实现远端设备与媒体转移设备的 通信转移至远端设备与转移接收设备的通信时，无需更改与网络侧远 端设备间建立的通信链接， 提高了网络效率。 并且， 远端设备发送的 媒体信息， 在网络侧传输时， 没有被更改， 从而进一步提高了网络效 本发明实施例提供了一种媒体转移的方法， 如图 4所示， 包括：
401、 接收控制点发送的获取媒体能力消息。
402、 向控制点发送媒体描述信息， 以使得在所述控制点在确定 出转移接收设备的情况下，将所述媒体描述信息及所述转移接收设备 的媒体描述信息发送至网关，以便所述网关根据所述媒体描述信息及 所述转移接收设备的媒体描述信息更新用于与远端设备通信的地址 映射表，以便所述网关将所述远端设备发送的媒体信息转发至所述转 移接收设备。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 设备的互联网协议 IP地址、 端口号及编解码能力信息。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 媒体转移设备可以向控制点发送获取媒体能力响应消 息。 所述获取媒体能力响应消息中携带有媒体描述信息。 也就是说， 媒体转移设备在接收到控制点发送的获取媒体能力 消 息 ( Ge tMed i aCapab i l i t i e s )后， 将媒体转移设备的媒体描述信息添加 至获取媒体能力响应消息中，并将获取媒体能力响应消息发送至控制 点。
进一步的， 在控制点集成在媒体转移设备的情况下， 用户通过媒 体转移设备向控制点发送业务转移请求;肖 , ,以使得控制点进行业务 转移。
本发明实施例一种媒体转移的方法，媒体转移设备将媒体描述信 息发送至控制点，以使得在所述控制点在确定出转移接收设备的情况 下，将所述媒体描述信息及所述转移接收设备的媒体描述信息发送至 网关，以便所述网关根据所述媒体描述信息及所述转移接收设备的媒 体描述信息更新用于与远端设备通信的地址映射表， 这样， 以便所述 网关将所述远端设备发送的媒体信息转发至所述转移接收设备。实现 远端设备与媒体转移设备的通信转移至远端设备与转移接收设备的 通信时， 无需更改与网络侧远端设备间建立的通信链接， 提高了网络 效率。 并且， 远端设备发送的媒体信息， 在网络侧传输时， 没有被更 改， 从而进一步提高了网络效率。
本发明实施例提供了一种媒体转移的方法， 如图 5所示， 包括： 501、 媒体转移设备与远端设备进行通信。
具体的， 若由媒体转移设备向远端设备发送媒体信息， 则媒体转 移设备先将要发送至远端设备的媒体信息发送至网关，再由网关将媒 体信息发送至远端设备。 其中， 媒体信息中包括： 数据报文头和数据 报文体。 媒体转移设备发送的媒体信息的数据报文头包括： 源 IP地 址， 源端口号， 目的 IP地址， 目的端口号。
其中， 媒体转移设备发送的媒体信息的数据报文头中的源 IP地 址为媒体转移设备的 IP地址， 源端口号为媒体转移设备的用于接收 远端设备发送的媒体信息的端口号，即为媒体转移设备的接收端口的 端口号， 目的 IP地址为远端设备的 I P地址， 目的端口号为远端设备 的接收端口的端口号。
网关接收到媒体转移设备发送的媒体信息，根据媒体信息中的数 据 4艮文头的源 IP地址及源端口号， 查找地址映射表， 在地址映射表 中查找到与源 IP地址及源端口号相匹配的表项， 根据此表项， 将数 据报文头的源 IP地址及源端口号由媒体转移设备的 IP地址及媒体转 移设备的端口号更改为公网的 IP地址及公网的端口号，目的 IP地址 及目的端口号不变。 此时， 媒体信息的数据报文头包括： 源 IP地址 为公网 IP地址， 源端口号为公网端口号， 目的 IP地址为远端设备的 IP 地址， 目的端口号为远端设备的接收端口的端口号， 将此媒体信 息发送至远端设备。
示例性的， 媒体转移设备为 phone , phone 与远端设备 CP ( Central Processor , 中央处理机） 进行视频通信。 phone 与 CP 间发送的媒体信息为视频数据报文。
若网关的内网侧的内网 IP地址是 192.168.1.1, 公共网侧的公 共 IP地址是 10.11.20.240。 网关内网侧的本地设备的 IP地址通过 DHCP获取。 其中， phone的 IP地址为 192.168.1.2, 用于接收远端 设备发送的媒体信息的端口号为 5060。 远端设备 CP 的 IP 地址为 173.194.64.147, 远端设备 CP的接收端口的端口号为 6060。
如图 6所示， phone向网关发送视频数据报文。 其中， 视频数据 艮文中的 4艮文头的源 IP地址为 192.168.1.2, 源端口号为 5060, 目 的 IP地址为 173.194.64.147,目的端口号为 6060。网关接收到 phone 发送的视频数据报文后， 根据视频数据报文的报文头中的源 IP地址 192.168.1.2, 源端口号 5060, 查找地址映射表， 查找到地址映射表 中与源 IP地址 192.168.1.2, 源端口号 5060相匹配的表项， 获取到 与源 IP地址 192.168.1.2, 源端口号 5060相对应的公网的 IP地址 与公网的端口号。 支如， 查找到的与源 IP地址 192.168.1.2对应的 公网的 IP地址为 10.11.20.240, 查找到的与源端口号 5060相对应 的公网端口号为 1234, 此时， 网关将视频数据报文的报文头中的源 IP地址及源端口号修改为公网的 IP地址， 公网的端口号。 即为， 将 视频数据报文的报文头中的源 IP 地址由 192.168.1.2 修改为 10.11.20.240, 将源端口号由 5060修改为 1234, 此时， 视频数据报 文的 4艮文头包括的源 IP地址为 10.11.20.240, 源端口号为 1234, 目 的 IP地址为 173.194.64.147, 目的端口号为 6060。 网关将此视频数 据报文发送至远端设备。
若由远端设备向媒体转移设备发送媒体信息，则远端设备先将要 发送至媒体转移设备的媒体信息发送至网关，再由网关将媒体信息发 送至媒体转移设备。
其中， 远端转移设备发送的媒体信息的数据报文头中的源 IP地 址为远端设备的 IP地址，源端口号为远端设备的接收端口的端口号， 目的 IP地址为媒体转移设备所属的公网的 IP地址， 目的端口号为媒 体转移设备的所属的公网的端口号。
网关接收到远端设备发送的媒体信息，根据媒体信息中的数据报 文头的目的 IP地址及目的端口号， 查找地址映射表， 在地址映射表 中查找到与目的 IP地址及目的端口号相匹配的表项， 根据此表项， 可选的，将数据报文头的目的 IP地址及目的端口号由公网的 IP地址 及公网的端口号更改为媒体转移设备的 IP地址及媒体转移设备的接 收端口的端口号， 源 IP地址及源端口号不变。 此时， 媒体信息的数 据报文头包括： 目的 IP地址为媒体转移设备 IP地址， 目的端口号为 媒体转移设备的接收端口的端口号，源 IP地址为远端设备的 IP地址， 源端口号为远端设备的接收端口的端口号。 根据媒体转移设备的 I P 地址及媒体转移设备的接收端口的端口号，将此媒体信息发送至媒体 转移设备。
需要说明的是，网关的地址映射表中存储的媒体转移设备的接收 端口的端口号为媒体转移设备用来接收远端设备发送的媒体信息的 端口号。
如上例所示， 参考图 6所示， 远端设备先向网关发送视频数据报 文。 其中， 4艮文中的 ·^艮文头的源 IP地址为 173. 194. 64. 147 , 源端口 号为 6060 , 目的 IP地址为 10. 11. 20. 240 , 目的端口号为 1234。 网 关接收到远端设备 CP发送的视频数据报文后， 根据视频数据报文的 艮文头中的目的 IP地址 10. 11. 20. 240 , 目的端口号 1234 , 查找地址 映射表， 查找到地址映射表中与目的 IP地址 10. 11. 20. 240 , 目的端 口号 1234相匹配的表项， 获取到与目的 IP地址 10. 11. 20. 240 , 目 的端口号 1234相对应的 IP地址为 192. 168. 1. 2 , 相对应的端口号为 5060。 此时， 可选的， 网关将视频数据 ^艮文的 4艮文头中的目的 IP地 址及目的端口号修改为在地址映射表中查找到的相移的 IP地址， 相 对应的端口号。 即为， 将视频数据报文的报文头中的目的 IP地址由 10. 11. 20. 24 4爹改为 192. 168. 1. 2 , 将目的端口号由 1234 4爹改为 5060 , 此时， 视频数据报文的报文头包括的源 IP 地址为 173. 194. 64. 147 , 源端口号为 6060 , 目的 IP地址为 192. 168. 1. 2 , 目 的端口号为 5060。 网关地址映射表中查找到的 IP 地址为 192. 168. 1. 2 , 相对应的端口号为 5060 , 将此视频数据报文发送至媒 体转移设备。
502、 媒体转移设备向所述控制点发送业务转移请求消息， 控制 点接收所述媒体转移设备发送的业务转移请求消息。 其中，所述业务转移请求消息携带所述媒体转移设备请求进行转 移的业务的信息。
进一步的，业务转移请求消息中还携带有媒体转移设备的标识信 息。
具体的， 当用户决定将媒体转移设备的业务进行媒体转移时， 用 户通过媒体转移设备向控制点发送业务转移请求消息，控制点接收媒 体转移设备发送的业务转移请求消息。
控制点接收到业务转移请求消息后，可以根据业务转移请求消息 中携带有媒体转移设备的标识信息，进行转移的业务信息确定出控制 点管理的本地设备中确定出媒体转移设备，并在媒体转移设备正在运 行的业务中确定出需要进行转移的业务。
需要说明的是，用户也可通过其他方法向控制点发送业务转移请 求消息， 例如用户可直接通过控制点的控制器发送业务转移请求消 息， 本发明对此不做限制。
503、 控制点检测本地网络， 确定所述本地设备， 获取所述本地 设备的服务描述信息。
其中， 所述服务描述信息是设备支持的业务的信息。 例如， 服务 描述信息包括： 视频信息， 语音信息等。
具体的， 控制点检测本地网络， 确定本地设备时， 可以获取所述 本地设备中所有设备的 URL ( Uniform / Universal Resource Locator, 统一资源定位符） 。 控制点根据获取的 URL可以获取本地 设备中所有设备的 UPnP ( Universal Plug and Play, 通用即插即用） 描述。 由于 UPnP描述分为设备描述和设备支持的服务描述， 所以， 控制点在获取 UPnP描述时， 可以获取本地设备中所有设备的描述， 即为获取设备的类型， 标识符等信息。 并可以获取本地设备中所有设 备支持的服务描述， 即为获取设备的服务描述信息。
其中， 本地设备包括： 媒体转移设备和至少一个第一设备。
控制点可以通过 HTTP协议获本地取设备的 URL, 具体信令如下：
NOTIFY * HTTP/1.1
HOST: 239.255.255.250: 1900CACHE-CONTROL: max-age = seconds until advertisement expires
LOCATION: URL for UPnP description for root device
NT: search target
NTS: s sdp: alive
USN: advertisement UUID。
控制点可以通过信令获取本地设备的设备描述和设备的服务 4， 具体的， 控制点获取本地设备的设备描述的具体信令， 如下：
<?xml version="l.0"?>
<root xmlns = "urn: schema s-upnp-org: device-1-0"
conf igld=" conf igurat ion number " >
<specVer s ion>
<ma jor>l</ ma jor>
<minor >K/minor>
</ specVer s ion>
<device>
<deviceType>urn: schema s-upnp-org: device: deviceType: v</ d eviceType>
<f riendly¾me>本地设备名 </f riendlyName>
<manuf acturer>Huawe i </ manuf acturer>
<manuf acturerURL>ht tp: //www. huawei. com < /manuf acturerURL
Figure imgf000031_0001
tit le</modelDescr ipt ion>
<mode lName>mode 1 name < /mode 1 ame >
<mode 1 Number >mode 1 numbe r< /mode 1 Number >
<modelURL>URL to model s i te</modelURL>
<serialNumber>0123456789</serialNumber>
<UDN>uuid: UUID</UDN> <UPC>Universal Product Code</UPC>
</ device>
</root>。
示例性的， 若所述本地设备为 TV, 则控制点可以通过如下信令, 获取 TV的设备描述:
<?xml version="l.0"?>
<root xmlns = "urn: schema s-upnp-org: device-1-0"
conf igld=" conf igurat ion number " >
<specVer s ion>
<ma jor>l</ ma jor>
<minor >K/minor>
</ specVer s ion>
<device>
<deviceType>urn: schema s-upnp-org: device: deviceType: v</ d eviceType>
<f r iendlyName>TV</ f r iendlyName>
<manuf acturer>Huawe i </ manuf acturer>
<manuf acturerURL>ht tp: //www. huawei. com < /manuf acturerURL
Figure imgf000032_0001
user- f r iendly tit le</modelDescr ipt ion>
<mode lName>mode 1 name < /mode 1 ame >
<mode 1 umbe r>mode 1 numbe r< /mode 1 umbe r>
<modelURL>URL to model s i te</modelURL>
<serialNumber>0123456789</serialNumber>
<UDN>uuid: UUID</UDN>
<UPC>Universal Product Code</UPC> </ device>
控制点获取本地设备的服务描述信息所使用的具体信令， 如下：
<?xml version="l.0"?>
<scpd
xmlns="urn: schemas-upnp-or g: service-1-0"
xmlns: dt l = "urn: domain—name: more-datatypes "
<！― Declarations for other namespaces added by UPnP Forum working committee (if any) go
here ― >
xmlns: dt2="urn: domain—name: vendor-datatypes "
<！― Declarations for other namespaces added by UPnP vendor (if any) go here ― >
conf igld=" conf igurat ion number " >
<specVer s ion>
<ma jor>l</ ma jor>
</ specVer s ion>
<act ionLis t>
<act ion>
<name>GetMediaCapabilities</ name>
<argumentList>
<argument>
<name>argument ame Inl</name>
<direction>in</ direct ion>
<re relatedStateVa r iable>
</argument > < / s c pd >。
需要说明的是， 在本发明所有实施例中，控制点可以集成在本地 设备中。 若控制点集成在某个本地设备中， 此时， 控制点中存储了集 成此控制点的本地设备的媒体描述信息，所以控制点在获取本地设备 的媒体描述信息时，可以获取没有集成此控制点的其他本地设备的媒 体描述信息。 例如， 控制点可以集成在媒体转移设备中， 由于控制点 已经获知了媒体转移设备的媒体描述信息，则控制点获取除此媒体转 移设备的其他本地设备的媒体描述信息。控制点也可以不集成在任何 一个设备中， 而是单独的设备， 此时控制点获取本地网络中所有用户 端设备的媒体描述信息， 包括： 媒体转移设备的媒体描述信息及转移 接收设备的媒体描述信息。在图 5中只表示出控制点为单独的设备的 一种情况， 本发明对此不做限制。
需要说明的是， 在本发明所有实施例中， 网关可以集成在本地设 备中。 例如， 转移接收设备为 TV , 则网关可以集成在 TV中， 此时， 网关可以是机顶盒。 网关也可以不集成在任何一个设备中， 而是单独 的设备， 在图 5中只表示出控制点为单独的设备的一种情况， 本发明 对此不做限制。
5 04、 控制点将所述服务描述信息与所述媒体转移设备进行转移 的业务进行匹配。
具体的， 控制点需根据媒体转移设备要进行转移的业务，检测获 取的第一设备的服务描述信息是否支持媒体转移设备要进行转移的 业务。
示例性的， 若媒体转移设备为 phone , 需进行转移的业务为视频 业务， 则此时需要转移设备支持视频业务。 控制点检测本地网络， 发 现本地网络中有一个 TV设备， 打印机设备。 控制点获取了 TV设备的 服务描述信息， 及打印机设备的服务描述信息。 其中， TV 设备的服 务描述信息中包括视频业务信息， 则说明 TV设备支持视频业务。 打 印机设备的服务描述信息中没有包括视频业务信息，则说明打印机设 备不支持视频业务。
由于 phone需进行媒体转移的业务是视频业务，所以控制点根据 phone需进行媒体转移的视频业务， 检测 TV设备的服务描述信息， 查看所述 TV设备的服务描述信息是否与 phone需进行媒体转移的视 频业务相匹配。 即为， 控制点查看 TV设备的服务描述信息中是否包 括视频业务。同样的，控制点根据 phone需进行媒体转移的视频业务， 打印机的服务描述信息， 查看打印机的服务描述信息是否与 phone 需进行媒体转移的视频业务相匹配。
由于 TV设备的服务描述信息包括视频业务信息， 控制点检测到 TV设备的服务描述信息与 phone需进行媒体转移的视频业务相匹配 , 则继续下面步骤。由于打印机的服务描述信息不包括：视频业务信息， 控制点检测到打印机设备的服务描述信息与 phone 需进行媒体转移 的视频业务不匹配， 则不继续下面步骤。
需要说明的是，若控制点检测到本地所有设备均与媒体转移设备 要进行转移的业务不匹配， 则可向媒体转移设备发送转移失败消息。
5 05、 控制点获取本地设备的媒体描述信息。
具体的，控制点在步骤 5 04能够检测出哪些本地设备的服务描述 信息与媒体转移设备进行转移的业务相匹配，则获取所述服务描述信 息与所述媒体转移设备进行转移的业务相相匹配的本地设备的媒体 描述信息。控制点具体获取所述服务描述信息与所述媒体转移设备进 行转移的业务相匹配的本地设备的媒体描述信息的过程，可参考步骤 1 01 , 在此不再赘述。 进一步的， 本地设备向控制点返回媒体描述信 息时， 可参考步骤 301、 401及 402 , 在此不再赘述。
5 06、 与步骤 1 02相同， 在此不再赘述。
5 07、所述控制点发送远端设备的媒体描述信息至转移接收设备， 以使得所述转移接收设备根据所述远端设备的媒体描述信息确定远 端设备的接收端口的端口号，以便根据所述远端设备的接收端口的端 口号检测接收的媒体信息是否是所述远端设备发送的媒体信息。转移 接收设备接收远端设备的媒体描述信息。
具体的， 控制点在确定出转移接收设备后， 将远端设备的媒体描 述信息发送至转移接收设备。由于远端设备的媒体描述信息中包含有 端口号信息， 所以， 转移接收设备可以根据远端设备的媒体描述信息 确定出远端设备的接收端口的端口号，以便转移接收设备根据远端设 备的接收端口的端口号， 对通过网关接收的媒体信息进行检测， 以确 定是否是所述远端设备发送的媒体信息。
可选的， 控制点可以通过会话建立消息（ SessionSetup )将所述 远端设备的媒体描述信息发送至所述转移接收设备。
示例性的， 若媒体转移设备为 phone (手机） ， 转移接收设备为 TV ( Television, 电视） ， phone要进行转移的媒体转移业务为视频 会话， 则此时远端的媒体描述信息可以是与语音或视频相关的信息。 控制 点将远端设备的媒体描述信息通过会话建立 消 息 ( SessionSetup ) 发送至 TV, 具体信令如下：
控制点-〉 TV:
POST /_urn: upnp-org: serviceld: Ca 1 IManagement _cont ro 1
HTTP/1.1
S0APACTI0N:
"urn: schemas -upnp-org: service: Ca 1 IManagement: 1# SessionSetup
II CONTENT-TYPE: text/xml ； char set = "utf -8 "
HOST: 192.168.1.1: 10001
Content-Length: [bytes in body]
<?xml vers ion=" 1.0" encoding="utf-8 "？ >
<s: Enve lope
s: encodingSty le="ht tp: II schemas. xml soap, org/soap/encoding/" xmlns: s = "ht tp: II schemas. xml soap. org/ soap/ envelope/ " > <s: Body>
<u: SessionSetup xmlns: u="urn: schemas -upnp-org: service: Cal IManagement: 1 " > <TelCPNameX/TelCPName>
<SecretKeyX/SecretKey>
<MediaCapabilityInfo— Remote>&lt; ?xml ver s ion= 1.0 " encoding="utf_8"?&gt;
&lt; cams:mediaCapabilityInfo
xs i: schemaLocat ion="urn: schemas -upnp-org: phone: cams ht tp: I /www. upnp. org/ schema s/ phone/ cams -vl. xsd"
xmlns: xs i = "ht tp: II www. w3. org/ 2001/XMLSchema-ins tance " xmlns: cams = "urn: schema s-upnp-org: phone: cams"&gt;
&lt; mediaCapability f ormat = " SDP" &gt; v=0
o=- 0 0 IN IP4 173.194.64.147
s=- c=IN IP4 173.194.64.147
t = 0 0
m=audio 11020 RTP/AVP 0
c=IN IP4 173.194.64.147
a=rtpmap: 0 PCMU/8000
a=pt ime: 20
&lt; /mediaCapabi 1 i ty&gt;
&11; / cams: mediaCapabi 1 i tylnf o&gt ; </MediaCapabilityInfo_ Remote>
</u: Sess ionTransf er >
</s: Body>
</ s: Enve lope>。
转移接收设备通过会话建立消息（ SessionSetup )接收所述控制 点发送的远端设备的媒体描述信息。 即为， 转移接收设备通过接收会 话建立消息（ SessionSetup )进而接收所述控制点发送的远端设备的 媒体描述信息。
508、 所述控制点发送媒体转移设备的媒体描述信息及转移接收 设备的媒体描述信息至网关，网关接收媒体转移设备的媒体描述信息 及转移接收设备的媒体描述信息。
具体的，所述控制点发送媒体转移设备的媒体描述信息及转移接 收设备的媒体描述信息至网关的过程， 可参考步骤 103, 在此不再赘 述。网关接收媒体转移设备的媒体描述信息及转移接收设备的媒体描 述信息的过程， 可参考步骤 201, 在此不再赘述。 需要说明的是，本发明实施例对步骤 507与 508间的顺序不做限 制。 可以先执行步骤 507 , 再执行步骤 508 , 也可先执行步骤 508 , 在执行步骤 507 , 还可以同时执行步骤 507与步骤 508 , 在图 5中， 只表示出一种情况。
509、 转移接收设备根据控制点发送的所述远端设备的媒体描述 信息确定所述远端设备的接收端口的端口号，以便根据所述远端设备 的接收端口的端口号检测接收的媒体信息是否是远端设备发送的媒 体信息。
具体的，转移接收设备接收到控制点发送的远端设备的媒体描述 信息后， 转移接收设备将媒体描述信息中的端口号， 确定为远端设备 的接收端口的端口号。
510、 与步骤 202相同， 在此不再赘述。
需要说明的是，本发明实施例对步骤 509与步骤 510间的顺序不 做限制， 也可以是先执行步骤 509 , 再执行步骤 510 , 也可先执行步 骤 510 , 再执行步骤 509 , 还可以， 同时执行步骤 509与步骤 510 , 在图 5中只表示出一种情况。
511、 网关接收远端设备发送的媒体信息。
其中， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据 报文头包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号。
进一步的，远端设备发送的媒体信息中的数据报文头中的所述源 IP地址为所述远端设备的 IP地址。 源端口号为所述远端设备的接收 端口的端口号。 所述目的 IP地址为公网的 IP地址； 所述目的端口号 为公网的端口号， 具体可参考步骤 203。
示例性的， 如图 7所示， 媒体转移设备为 phone , 转移接收设备 为 TV。 phone与远端设备 CP ( Cent ra l Proce s s or , 中央处理机） 进行视频通信， 现在 phone要进行视频业务的转移， 控制点将 TV选 为转移接收设备， 即为， phone将视频业务转移至 TV , 由 TV与远端 设备 CP进行视频通信。 此时， CP与 phone间发送的媒体信息为视频 数据报文。
殳如， 网关的内网侧的内网 IP地址是 192. 168. 1. 1 , 公共网侧 的公共 IP地址是 10. 11. 20. 240。 网关内网侧的本地设备的 IP地址 通过 DHCP获取。 其中， 媒体转移设备为 phone, 转移接收设备为 TV。 phone的媒体描述信息包括： phone的 IP地址为 192.168.1.2, phone 的接收端口的端口号为 5060。 TV的媒体描述信息包括： TV的 IP地 址为 192.168.1.3, TV的接收端口的端口号为 5060。 远端设备 CP的 IP地址为 173.194.64.147, 远端设备的接收端口的端口号为 6060。
如图 8所示， 远端设备 CP将视频数据报文发送至网关， 网关接 收到视频数据报文后， 检测到视频数据报文的报文头的目的 IP地址 为 10.11.20.240, 目的端口号为 1234, 则网关根据视频数据报文的 艮文头的目的 IP地址为 10.11.20.240, 目的端口号为 1234, 查找地 址映射表， 在地址映射表中查找到与 IP地址为 10.11.20.240, 端口 号为 1234 相匹配的表项， 根据此表项获取到与 目 的 IP 地址 10.11.20.240, 目的端口号 1234相对应的 IP地址为 192.168.1.3, 对应的端口号为 5060。 此时， 可选的， 网关将视频数据报文的报文 头中的目的 IP地址及目的端口号修改为在地址映射表中查找到的对 应的 IP地址， 及端口号。 即为， 将视频数据报文的报文头中的目的 IP地址由 10.11.20.244爹改为 192.168.1.3, 将目的端口号由 1234 修改为 5060, 此时， 视频数据报文的报文头包括的源 IP 地址为 173.194.64.147, 源端口号为 6060, 目的 IP地址为 192.168.1.3, 目的端口号为 5060。
网关根据在地址映射表中查找到的 TV的 IP地址及端口号，将视 频数据报文发送至 TV。 可选的， 网关若将视频数据报文中的目的 IP 地址及目的端口号修改为 TV的 IP地址及端口号，则将更新后的视频 数据报文发送至转移接收设备，即为网关将更新后的视频数据报文发 送至 TV。
若转移转移接收设备， 即为 TV需向远端设备发送视频数据包， 参考图 8所示， TV先向网关发送视频数据报文。 其中， 视频数据报 文中的 4艮文头的源 IP地址为 192.168.1.3, 源端口号为 5060, 目的 IP地址为 173.194.64.147, 目的端口号为 6060。 网关接收到 TV发 送的视频数据报文后， 根据视频数据报文的报文头中的源 IP 地址 192.168.1.3, 源端口号 5060, 查找地址映射表， 查找到地址映射表 中与源 IP地址 192.168.1.3, 源端口号 5060相匹配的表项， 获取到 与源 IP地址 192.168.1.3, 源端口号 5060相对应的公网的 IP地址 与公网的端口号。 此时， 网关将视频数据 ^艮文的 4艮文头中的源 IP地 址及源端口号修改为公网的 IP地址， 公网的端口号。 即为， 将视频 数据报文的报文头中 的源 IP 地址由 192. 168. 1. 3 修改为 10. 11. 20. 240 , 将源端口号由 5060修改为 1234 , 此时， 视频数据 4艮 文的 4艮文头包括的源 IP地址为 10. 11. 20. 240 , 源端口号为 1234 , 目 的 IP地址为 173. 194. 64. 147 , 目的端口号为 6060。 网关将此更新后 的视频数据报文发送至远端设备。
512、 网关将接收的所述远端设备发送的媒体信息发送至所述转 移接收设备， 转移接收设备接收网关转发的远端设备发送的媒体信 息。
其中， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据 报文头包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号。 所 述源 IP地址为所述远端设备的 IP地址；源端口号为所述远端设备的 接收端口的端口号。 所述目的 IP地址为转移接收设备的 IP地址； 所 述目的端口号为所述转移接收设备的接收端口的端口号。
具体的， 可参考步骤 204及步骤 302 , 在此不再赘述。
51 3、 转移接收设备检测所述媒体信息的所述数据报文头中的源 端口号与根据所述远端设备的媒体描述信息所确定的所述远端设备 的接收端口的端口号是否相同。
具体的， 转移接收设备接收到网关转发的媒体信息后， 解析出媒 体信息的数据报文头。 将媒体信息的数据报文头中的源端口号， 与根 据所述远端设备的媒体描述信息所确定的所述远端设备的接收端口 的端口号进行比对。
转移接收设备若检测出所述数据报文头中的源端口号与远端设 备的接收端口的端口号不相同， 则丟弃所述媒体信息。 若检测出所述 数据报文头中的源端口号与远端设备的接收端口的端口号相同，则处 理所述媒体信息。
本发明实施例提供了一种媒体转移的方法，控制点通过获取本地 设备的媒体描述信息，将获取的本地设备的媒体描述信息与存储的远 端设备的媒体描述信息进行匹配， 根据匹配结果确定出转移接收设 备。 向转移接收设备发送远端设备的媒体描述信息。 向网关发送转移 接收设备的媒体描述信息及媒体转移设备的媒体描述信息，以使得网 关根据转移接收设备的媒体描述信息及媒体转移设备的媒体描述信 息更新地址映射表。 这样， 使得网关在接收到远端设备发送的媒体信 息时，根据更新的地址映射表可以确定出应接收远端设备发送的媒体 信息的转移接收设备， 并将媒体信息发送至转移接收设备。 实现远端 设备与媒体转移设备的通信转移至远端设备与转移接收设备的通信 时，无需更改与网络侧远端设备间建立的通信链接，提高了网络效率。 并且， 远端设备发送的媒体信息， 在网络侧传输时， 没有被更改， 从 而进一步提高了网络效率。
本发明实施例提供了一种控制点， 如图 9所示， 包括：
获取单元 801 , 用于获取本地设备的媒体描述信息。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 所述本地设备的互联网协议 IP地址、 端口号及编解码能力信息。 所 述本地设备包括： 媒体转移设备和至少一个第一设备。
需要说明的是， 本地设备是指控制点管理的设备。 所述媒体转移 设备是指本地设备中，要进行媒体转移的设备。 第一设备是指本地设 备中， 除媒体转移设备之外的设备。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 所述获取单元 801具体用于， 获取媒体转移设备的媒体 描述信息及至少一个第一设备的媒体描述信息。
进一步的， 所述获取单元 801具体用于， 通过获取媒体能力消息 ( Ge tMed i aCapab i l i t i e s ) 获取本地设备的媒体描述信息。
处理单元 802 , 用于将所述获取单元 801获取的所述至少一个第 一设备的媒体描述信息与已获取的远端设备的媒体描述信息进行匹 配， 根据匹配结果从所述至少一个第一设备中确定出转移接收设备。
所述收发单元 803 , 用于将所述媒体转移设备的媒体描述信息及 所述转移接收设备的媒体描述信息发送至网关，以使得所述网关根据 所述媒体转移设备的媒体描述信息及所述转移接收设备的媒体描述 信息更新用于与所述远端设备通信的地址映射表，以便所述网关将所 述远端设备发送的媒体信息转发至所述转移接收设备。
具体的， 所述收发单元 803 具体用于， 通过会话转移消息 ( SessionTransfer ) 将所述媒体转移设备的媒体描述信息及所述转 移接收设备的媒体描述信息发送至网关。
进一步的， 所述收发单元 803, 还用于将所述远端设备的媒体描 述信息发送至所述处理单元 802确定的所述转移接收设备，以使得所 述转移接收设备根据所述远端设备的媒体描述信息确定远端设备的 接收端口的端口号，以便根据所述远端设备的接收端口的端口号检测 接收的媒体信息是否是所述远端设备发送的媒体信息。
具体的， 所述收发单元 803 具体用于， 通过会话建立消息 ( SessionSetup )将所述远端设备的媒体描述信息发送至所述转移接 收设备。
上述控制点， 如图 10所示， 还包括： 检测单元 804。
所述收发单元 803, 还用于接收所述媒体转移设备发送的业务转 移请求消息。
其中，所述业务转移请求消息携带所述媒体转移设备请求进行转 移的业务的信息。
所述检测单元 804, 用于检测本地网络， 确定所述本地设备。 所述获取单元 801, 还用于获取所述检测单元 804确定的所述本 地设备的服务描述信息。
其中， 所述服务描述信息是设备支持的业务的信息。
所述处理单元 802, 还用于将所述获取单元 801获取的所述本地 设备的服务描述信息与所述媒体转移设备进行转移的业务进行匹配。
此时，所述获取单元 801具体根据所述处理单元 802匹配的匹配 结果，获取所述服务描述信息与所述媒体转移设备进行转移的业务相 匹配的本地设备的媒体描述信息。
本发明实施例提供了一种控制点，控制点通过获取本地设备的媒 体描述信息，将获取的本地设备的媒体描述信息与存储的远端设备的 媒体描述信息进行匹配， 根据匹配结果确定出转移接收设备。 向网关 发送转移接收设备的媒体描述信息及媒体转移设备的媒体描述信息， 以使得网关根据转移接收设备的媒体描述信息及媒体转移设备的媒 体描述信息更新地址映射表。 这样， 使得网关在接收到远端设备发送 的媒体信息时 ,根据更新的地址映射表可以确定出应接收远端设备发 送的媒体信息的转移接收设备， 并将媒体信息发送至转移接收设备。 实现远端设备与媒体转移设备的通信转移至远端设备与转移接收设 备的通信时， 无需更改与网络侧远端设备间建立的通信链接， 提高了 网络效率。 并且， 远端设备发送的媒体信息， 在网络侧传输时， 没有 被更改， 从而进一步提高了网络效率。
本发明实施例提供了一种网关， 如图 11所示， 包括：
收发单元 1001 , 用于接收控制点发送的媒体转移设备的媒体描 述信息及转移接收设备的媒体描述信息。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 所述本地设备的互联网协议 IP地址、 端口号及编解码能力信息。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的 ， 所述收发单元 1001 具体通过会话转移消息 ( Se s s i onTrans fe r ) 接收控制点发送的媒体转移设备的媒体描述信 息及转移接收设备的媒体描述信息。
更新单元 1002 , 用于根据所述收发单元 1001接收的所述媒体转 移设备的媒体描述信息及所述转移接收设备的媒体描述信息更新用 于与远端设备通信的地址映射表。
具体的， 所述更新单元 1002具体用于， 根据所述收发单元 1001 接收的所述媒体转移设备的媒体描述信息，将所述地址映射表中存储 的所述媒体转移设备的 IP地址及接收端口的端口号与公网的 IP地址 及端口号间的映射关系的表项删除。 根据所述收发单元 1001接收的 所述转移接收设备的媒体描述信息， 建立所述转移接收设备的 IP地 址及接收端口的端口号与公网 IP地址及端口号间的映射关系， 并存 储至所述地址映射表中。
所述收发单元 1001 , 还用于接收远端设备发送的媒体信息。 其中， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据 报文头包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号。 所 述源 IP地址为所述远端设备的 IP地址；源端口号为所述远端设备的 接收端口的端口号； 所述目的 IP地址为公网的 IP地址； 所述目的端 口号为公网的端口号。 所述收发单元 1001 , 还用于根据所述更新单元 1002更新的用于 与远端设备通信的地址映射表，将接收的所述远端设备发送的媒体信 息发送至所述转移接收设备。
具体的， 所述收发单元 1001 , 如图 12所示， 包括：
查找子单元 1 0011 , 用于根据接收的所述媒体信息的所述数据报 文头的目的 IP地址及目的端口号查找所述更新单元 1002更新的用于 与所述远端设备通信的地址映射表， 确定转移接收设备的 IP地址及 接收端口的端口号。
所述收发子单元 1 0012 , 还用于根据所述查找子单元 1 0011确定 的所述转移接收设备的 IP地址及接收端口的端口号， 将所述媒体信 息发送至所述转移接收设备。
可选的， 所述更新单元 1002 , 还用于将所述媒体信息的所述数 据报文头的目的 IP地址及目的端口号更新为转移接收设备的 IP地址 及接收端口的端口号。
此时， 所述收发子单元 1 Q Q 1 2 具体根据所述查找子单元 10011 确定所述转移接收设备的 IP地址及接收端口的端口号， 将所述更新 单元 1002更新后的媒体信息发送至所述转移接收设备。
本发明实施例提供了一种网关，网关接收转移接收设备的媒体描 述信息及媒体转移设备的媒体描述信息，并根据转移接收设备的媒体 描述信息及媒体转移设备的媒体描述信息更新地址映射表。 这样， 使 得网关在接收到远端设备发送的媒体信息时，根据更新的地址映射表 可以确定出应接收远端设备发送的媒体信息的转移接收设备，并将媒 体信息发送至转移接收设备。实现远端设备与媒体转移设备的通信转 移至远端设备与转移接收设备的通信时，无需更改与网络侧远端设备 间建立的通信链接， 提高了网络效率。 并且， 远端设备发送的媒体信 息， 在网络侧传输时， 没有被更改， 从而进一步提高了网络效率。
本发明实施例提供了一种转移接收设备， 如图 1 3所示， 包括： 收发单元 1201 , 用于向控制点发送媒体描述信息， 以使得所述 控制点在接收到所述媒体描述信息后，将所述媒体描述信息与已获取 的远端设备的媒体描述信息进行匹配，在所述媒体描述信息与已获取 的远端设备的媒体描述信息相匹配的情况下，则将所述媒体描述信息 发送至网关，以便所述网关根据所述媒体描述信息及所述控制点发送 的媒体转移设备的媒体描述信息更新用于与所述远端设备通信的地 址映射表，以便所述网关将所述远端设备发送的媒体信息转发至所述 转移接收设备。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 所述本地设备的互联网协议 IP地址、 端口号及编解码能力信息。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 所述收发单元 1201具体通过向控制点发送获取媒体能 力响应消息来向所述控制点发送媒体描述信息。
其中， 所述获取媒体能力响应消息中携带有所述媒体描述信息。 所述收发单元 1201 , 还用于接收网关转发的来自所述远端设备 的媒体信息。
其中， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据 报文头包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号。 所 述源 IP地址为所述远端设备的 IP地址；源端口号为所述远端设备的 接收端口的端口号； 所述目的 IP地址为转移接收设备的 IP地址； 所 述目的端口号为所述转移接收设备的接收端口的端口号。
进一步的， 所述收发单元 1201 , 还用于接收所述控制点发送的 远端设备的媒体描述信息。
具体的 ， 所述收发单元 1201 具体通过会话建立消息 ( Se s s i onSe tup )接收所述控制点发送的远端设备的媒体描述信息。
所述转移接收设备， 参考图 13所示， 还包括：
处理单元 1202 , 用于根据所述收发单元 1201接收的所述远端设 备的媒体描述信息确定所述远端设备的接收端口的端口号，以便根据 所述远端设备的接收端口的端口号检测接收的媒体信息是否是所述 远端设备发送的媒体信息。
进一步的， 所述处理单元 1203 , 还用于检测所述收发单元 1201 接收的所述媒体信息的所述数据报文头中的源端口号与根据所述远 端设备的媒体描述信息所确定的所述远端设备的接收端口的端口号 是否相同。在检测出所述数据报文头中的源端口号与所述远端设备的 接收端口的端口号不相同的情况下， 丟弃所述媒体信息。 在检测出所 述数据报文头中的源端口号与所述远端设备的接收端口的端口号相 同的情况下， 处理所述媒体信息。
本发明实施例一种转移接收设备，转移接收设备向控制点发送媒 体描述信息， 使得所述控制点在接收到所述媒体描述信息后， 将所述 媒体描述信息与已获取的远端设备的媒体描述信息进行匹配，在所述 媒体描述信息与已获取的远端设备的媒体描述信息相匹配的情况下， 则将所述媒体描述信息发送至网关，以便所述网关根据所述媒体描述 信息及所述控制点发送的媒体转移设备的媒体描述信息更新用于与 所述远端设备通信的地址映射表，以便所述网关将所述远端设备发送 的媒体信息转发至所述转移接收设备。 这样， 转移接收设备通过网关 接收远端设备发送的媒体信息，实现远端设备与媒体转移设备的通信 转移至远端设备与转移接收设备的通信时，无需更改与网络侧远端设 备间建立的通信链接， 提高了网络效率。 并且， 远端设备发送的媒体 信息， 在网络侧传输时， 没有被更改， 从而进一步提高了网络效率。
本发明实施例提供了一种媒体转移设备， 如图 14所示， 包括： 收发单元 1 301 , 用于接收控制点发送的获取媒体能力消息 所述收发单元 1 301 , 还用于向控制点发送媒体描述信息， 以使 得在所述控制点在确定出转移接收设备的情况下，将所述媒体描述信 息及所述转移接收设备的媒体描述信息发送至网关，以便所述网关根 据所述媒体描述信息及所述转移接收设备的媒体描述信息更新用于 与远端设备通信的地址映射表，以便所述网关将所述远端设备发送的 媒体信息转发至所述转移接收设备。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 设备的互联网协议 IP地址、 端口号及编解码能力信息。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 所述收发单元 1301具体向控制点发送获取媒体能力响 应消息来向所述控制点发送媒体描述信息。
其中， 所述获取媒体能力响应消息中携带有媒体描述信息。
进一步的， 所述收发单元 1301 , 还用于向所述控制点发送业务 转移请求消息。 本发明实施例一种媒体转移设备，媒体转移设备将媒体描述信息 发送至控制点， 以使得在所述控制点在确定出转移接收设备的情况 下，将所述媒体描述信息及所述转移接收设备的媒体描述信息发送至 网关，以便所述网关根据所述媒体描述信息及所述转移接收设备的媒 体描述信息更新用于与远端设备通信的地址映射表， 这样， 以便所述 网关将所述远端设备发送的媒体信息转发至所述转移接收设备。实现 远端设备与媒体转移设备的通信转移至远端设备与转移接收设备的 通信时， 无需更改与网络侧远端设备间建立的通信链接， 提高了网络 效率。 并且， 远端设备发送的媒体信息， 在网络侧传输时， 没有被更 改， 从而进一步提高了网络效率。
本发明实施例提供了一种控制点， 如图 15所示， 包括： 处理器 1501 , 用于获取本地设备的媒体描述信息。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 所述本地设备的互联网协议 IP地址、 端口号及编解码能力信息。 所 述本地设备包括： 媒体转移设备和至少一个第一设备。
需要说明的是， 本地设备是指控制点管理的设备。 所述媒体转移 设备是指本地设备中，要进行媒体转移的设备。 第一设备是指本地设 备中， 除媒体转移设备之外的设备。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 所述处理器 1501具体用于， 获取媒体转移设备的媒体 描述信息及至少一个第一设备的媒体描述信息。
进一步的， 所述处理器 1501具体用于， 通过获取媒体能力消息 ( Ge tMed i aCapab i l i t i e s ) 获取本地设备的媒体描述信息。
所述处理器 1501 , 还用于将获取的所述至少一个第一设备的媒 体描述信息与已获取的远端设备的媒体描述信息进行匹配，根据匹配 结果从所述至少一个第一设备中确定出转移接收设备。
所述收发器 1502 , 用于将所述媒体转移设备的媒体描述信息及 所述转移接收设备的媒体描述信息发送至网关，以使得所述网关根据 所述媒体转移设备的媒体描述信息及所述转移接收设备的媒体描述 信息更新用于与所述远端设备通信的地址映射表，以便所述网关将所 述远端设备发送的媒体信息转发至所述转移接收设备。 具体的， 所述收发器 1502 具体用于， 通过会话转移消息 ( SessionTransfer ) 将所述媒体转移设备的媒体描述信息及所述转 移接收设备的媒体描述信息发送至网关。
进一步的， 收发器 1502, 还用于将所述远端设备的媒体描述信 息发送至所述转移接收设备，以使得所述转移接收设备根据所述远端 设备的媒体描述信息确定远端设备的接收端口的端口号，以便根据所 述远端设备的接收端口的端口号检测接收的媒体信息是否是所述远 端设备发送的媒体信息。
具体的， 所述收发器 1502 具体用于， 通过会话建立消息 ( SessionSetup )将所述远端设备的媒体描述信息发送至所述转移接 收设备。
上述收发器 1502, 还用于接收所述媒体转移设备发送的业务转 移请求消息。
其中，所述业务转移请求消息携带所述媒体转移设备请求进行转 移的业务的信息。
上述处理器 1501, 还用于检测本地网络， 确定所述本地设备； 并获取所述本地设备的服务描述信息。
其中， 所述服务描述信息是设备支持的业务的信息。
所述处理器 1501, 还用于将获取的所述本地设备的服务描述信 息与所述媒体转移设备进行转移的业务进行匹配。
此时， 所述处理器 1501获取本地设备的媒体描述信息， 具体为： 根据匹配结果，获取所述服务描述信息与所述媒体转移设备进行转移 的业务相匹配的本地设备的媒体描述信息。
本发明实施例提供了一种控制点，控制点通过获取本地设备的媒 体描述信息，将获取的本地设备的媒体描述信息与存储的远端设备的 媒体描述信息进行匹配， 根据匹配结果确定出转移接收设备。 向网关 发送转移接收设备的媒体描述信息及媒体转移设备的媒体描述信息， 以使得网关根据转移接收设备的媒体描述信息及媒体转移设备的媒 体描述信息更新地址映射表。 这样， 使得网关在接收到远端设备发送 的媒体信息时，根据更新的地址映射表可以确定出应接收远端设备发 送的媒体信息的转移接收设备， 并将媒体信息发送至转移接收设备。 实现远端设备与媒体转移设备的通信转移至远端设备与转移接收设 备的通信时， 无需更改与网络侧远端设备间建立的通信链接， 提高了 网络效率。 并且， 远端设备发送的媒体信息， 在网络侧传输时， 没有 被更改， 从而进一步提高了网络效率。
本发明实施例提供了一种网关， 如图 16所示， 包括：
收发器 1601 , 用于接收控制点发送的媒体转移设备的媒体描述 信息及所述转移接收设备的媒体描述信息。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 所述本地设备的互联网协议 IP地址、 端口号及编解码能力信息。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 所述收发器 1601 具体用于， 通过会话转移消息 ( Se s s i onTrans fe r ) 接收控制点发送的媒体转移设备的媒体描述信 息及所述转移接收设备的媒体描述信息。
处理器 1602 , 用于根据所述收发器 1601接收的所述媒体转移设 备的媒体描述信息及所述转移接收设备的媒体描述信息更新用于与 远端设备通信的地址映射表。
具体的， 所述处理器 1602具体用于， 根据所述收发器 1601接收 的所述媒体转移设备的媒体描述信息，将所述地址映射表中存储的所 述媒体转移设备的 IP地址及接收端口的端口号与公网的 IP地址及端 口号间的映射关系的表项删除。 根据所述收发器 1601接收的所述转 移接收设备的媒体描述信息， 建立所述转移接收设备的 IP地址及接 收端口的端口号与公网 IP地址及端口号间的映射关系， 并存储至所 述地址映射表中。
所述收发器 1601 , 还用于接收远端设备发送的媒体信息。
其中， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据 报文头包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号。 所 述源 IP地址为所述远端设备的 IP地址；源端口号为所述远端设备的 接收端口的端口号； 所述目的 IP地址为公网的 IP地址； 所述目的端 口号为公网的端口号。
所述收发器 1601 , 还用于根据所述处理器 1602更新的用于与远 端设备通信的地址映射表，将接收的所述远端设备发送的媒体信息发 送至所述转移接收设备。
具体的， 所述收发器 1601具体用于， 根据接收的所述媒体信息 的所述数据报文头的目的 IP地址及目的端口号查找所述处理器 1602 更新的用于与所述远端设备通信的地址映射表，确定转移接收设备的 IP地址及接收端口的端口号。 并根据所述转移接收设备的 IP地址及 接收端口的端口号， 将所述媒体信息发送至所述转移接收设备。
可选的， 所述处理器 1602 , 还用于将所述媒体信息的所述数据 报文头的目的 IP地址及目的端口号更新为转移接收设备的 IP地址及 接收端口的端口号。
此时， 所述收发器 1601 , 具体根据所述转移接收设备的 IP地址 及接收端口的端口号， 将所述处理器 1602更新后的媒体信息发送至 所述转移接收设备。
本发明实施例提供了一种网关，网关接收转移接收设备的媒体描 述信息及媒体转移设备的媒体描述信息，并根据转移接收设备的媒体 描述信息及媒体转移设备的媒体描述信息更新地址映射表。 这样， 使 得网关在接收到远端设备发送的媒体信息时，根据更新的地址映射表 可以确定出应接收远端设备发送的媒体信息的转移接收设备，并将媒 体信息发送至转移接收设备。实现远端设备与媒体转移设备的通信转 移至远端设备与转移接收设备的通信时，无需更改与网络侧远端设备 间建立的通信链接， 提高了网络效率。 并且， 远端设备发送的媒体信 息， 在网络侧传输时， 没有被更改， 从而进一步提高了网络效率。
本发明实施例提供了一种转移接收设备， 如图 17所示， 包括： 收发器 1701 , 用于向控制点发送媒体描述信息， 以使得所述控 制点在接收到所述媒体描述信息后，将所述媒体描述信息与已获取的 远端设备的媒体描述信息进行匹配，在所述媒体描述信息与已获取的 远端设备的媒体描述信息相匹配的情况下，则将所述媒体描述信息发 送至网关，以便所述网关根据所述媒体描述信息及所述控制点发送的 媒体转移设备的媒体描述信息更新用于与所述远端设备通信的地址 映射表，以便所述网关将所述远端设备发送的媒体信息转发至所述转 移接收设备。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 所述本地设备的互联网协议 IP地址、 端口号及编解码能力信息。 进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 所述收发器 1701具体通过向控制点发送获取媒体能力 响应消息来向所述控制点发送媒体描述信息。
其中， 所述获取媒体能力响应消息中携带有所述媒体描述信息。 所述收发器 1701 , 还用于接收网关转发的来自所述远端设备的 媒体信息。
其中， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据 报文头包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号。 所 述源 IP地址为所述远端设备的 IP地址；源端口号为所述远端设备的 接收端口的端口号； 所述目的 IP地址为转移接收设备的 IP地址； 所 述目的端口号为所述转移接收设备的接收端口的端口号。
进一步的， 所述收发器 1701 , 还用于接收所述控制点发送的远 端设备的媒体描述信息。
具体的 ， 所述收发器 1701 具体通过会话建立 消 息 ( Se s s i onSe tup )接收所述控制点发送的远端设备的媒体描述信息。
处理器 1702 , 用于根据所述收发器 1701接收的所述远端设备的 媒体描述信息确定所述远端设备的接收端口的端口号，以便根据所述 远端设备的接收端口的端口号检测接收的媒体信息是否是所述远端 设备发送的媒体信息。
进一步的， 所述处理器 1702 , 还用于检测所述收发器 1701接收 的所述媒体信息的所述数据报文头中的源端口号与根据所述远端设 备的媒体描述信息所确定的所述远端设备的接收端口的端口号是否 相同。在检测到所述数据报文头中的源端口号与所述远端设备的接收 端口的端口号不相同的情况下，所述处理器 1702丟弃所述媒体信息。 在检测到所述数据报文头中的源端口号与所述远端设备的接收端口 的端口号相同的情况下， 所述处理器 15021702处理所述媒体信息。
本发明实施例一种转移接收设备，转移接收设备向控制点发送媒 体描述信息， 使得所述控制点在接收到所述媒体描述信息后， 将所述 媒体描述信息与已获取的远端设备的媒体描述信息进行匹配，在所述 媒体描述信息与已获取的远端设备的媒体描述信息相匹配的情况下， 则将所述媒体描述信息发送至网关，以便所述网关根据所述媒体描述 信息及所述控制点发送的媒体转移设备的媒体描述信息更新用于与 所述远端设备通信的地址映射表，以便所述网关将所述远端设备发送 的媒体信息转发至所述转移接收设备。 这样， 转移接收设备通过网关 接收远端设备发送的媒体信息，实现远端设备与媒体转移设备的通信 转移至远端设备与转移接收设备的通信时，无需更改与网络侧远端设 备间建立的通信链接， 提高了网络效率。 并且， 远端设备发送的媒体 信息， 在网络侧传输时， 没有被更改， 从而进一步提高了网络效率。
本发明实施例提高了一种媒体转移设备， 如图 18所示， 包括： 收发器 1801 , 用于接收控制点发送的获取媒体能力消息。
所述收发器 1801 , 还用于向控制点发送媒体描述信息， 以使得 在所述控制点在确定出转移接收设备的情况下，将所述媒体描述信息 及所述转移接收设备的媒体描述信息发送至网关，以便所述网关根据 所述媒体描述信息及所述转移接收设备的媒体描述信息更新用于与 远端设备通信的地址映射表，以便所述网关将所述远端设备发送的媒 体信息转发至所述转移接收设备。
其中，所述媒体描述信息用于指示设备的通信相关的信息，包括： 设备的互联网协议 IP地址、 端口号及编解码能力信息。
进一步的， 所述媒体描述信息还包括： 传输协议和 /或媒体格式。 具体的， 所述收发器 1801具体向控制点发送获取媒体能力响应 消息来向所述控制点发送媒体描述信息。
其中， 所述获取媒体能力响应消息中携带有媒体描述信息。
进一步的， 所述收发器 1801 , 还用于向所述控制点发送业务转 移请求消息。
本发明实施例一种媒体转移设备，媒体转移设备将媒体描述信息 发送至控制点， 以使得在所述控制点在确定出转移接收设备的情况 下，将所述媒体描述信息及所述转移接收设备的媒体描述信息发送至 网关，以便所述网关根据所述媒体描述信息及所述转移接收设备的媒 体描述信息更新用于与远端设备通信的地址映射表， 这样， 以便所述 网关将所述远端设备发送的媒体信息转发至所述转移接收设备。实现 远端设备与媒体转移设备的通信转移至远端设备与转移接收设备的 通信时， 无需更改与网络侧远端设备间建立的通信链接， 提高了网络 效率。 并且， 远端设备发送的媒体信息， 在网络侧传输时， 没有被更 改， 从而进一步提高了网络效率。
本发明实施例提供了一种媒体转移的系统， 如图 19所示， 包括： 媒体转移设备 1901, 转移接收设备 1902, 控制点 1903, 网关 1904, 远端设备 1905。
所述控制点 1903为上述实施例所述的一种控制点。 所述转移接 收设备 1902为上述实施例所述的一种转移接收设备。 所述网关 1904 为上述实施例提供的一种网关。 媒体转移设备 1901为上述实施例所 述的一种媒体转移设备。 或者，
所述控制点 1903为上述实施例所述的另一种控制点。 所述转移 接收设备 1902为上述实施例所述的另一种转移接收设备。 所述网关 1904为上述实施例提供的另一种网关。 媒体转移设备 1901为上述实 施例所述的另一种媒体转移设备。
进一步的， 所述控制点 1903集成在所述媒体转移设备 1901 中。 或者， 所述控制点 1903集成在所述转移接收设备 1902中。
所述网关 1904集成在所述转移接收设备 1902中。
可选的， 网关为机顶盒， 转移接收设备 1902为电视设备。
本发明实施例提供了一种媒体转移的方法、装置及系统， 控制点 通过获取本地设备的媒体描述信息，将获取的本地设备的媒体描述信 息与存储的远端设备的媒体描述信息进行匹配，根据匹配结果确定出 转移接收设备。 向转移接收设备发送远端设备的媒体描述信息， 使得 转移接收设备接收到远端设备的媒体描述信息后，根据此媒体描述信 息确定远端设备的接收端口的端口号，以便根据所述远端设备的接收 端口的端口号向远端设备发送媒体信息。向网关发送转移接收设备的 媒体描述信息及媒体转移设备的媒体描述信息，以使得网关根据转移 接收设备的媒体描述信息及媒体转移设备的媒体描述信息更新地址 映射表。 这样， 使得网关在接收到远端设备发送的媒体信息时， 根据 更新的地址映射表可以确定出应接收远端设备发送的媒体信息的转 移接收设备， 并将媒体信息发送至转移接收设备。 实现远端设备与媒 体转移设备的通信转移至远端设备与转移接收设备的通信时，无需更 改与网络侧远端设备间建立的通信链接， 提高了网络效率。 并且， 远 端设备发送的媒体信息， 在网络侧传输时， 没有被更改， 从而进一步 提高了网络效率。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并 不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范 围内， 可轻易想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应以所述权利要求的保护范围为准。

Claims

权利要求
1、 一种媒体转移的方法， 其特征在于， 包括：
获取本地设备的媒体描述信息；所述媒体描述信息用于指示设备 的通信相关的信息， 包括： 设备的互联网协议 IP地址、 端口号及编 解码能力信息； 其中， 所述本地设备包括： 媒体转移设备和至少一个 第一设备；
将获取的所述至少一个第一设备的媒体描述信息与已获取的远 端设备的媒体描述信息进行匹配 ,根据匹配结果从所述至少一个第一 设备中确定出转移接收设备；
将所述媒体转移设备的媒体描述信息及所述转移接收设备的媒 体描述信息发送至网关，以使得所述网关根据所述媒体转移设备的媒 体描述信息及所述转移接收设备的媒体描述信息更新用于与所述远 端设备通信的地址映射表，以便所述网关将所述远端设备发送的媒体 信息转发至所述转移接收设备。
2、 根据权利要求 1所述的方法， 其特征在于， 所述方法还包括： 将所述远端设备的媒体描述信息发送至所述转移接收设备，以使 得所述转移接收设备根据所述远端设备的媒体描述信息确定所述远 端设备的接收端口的端口号，以便根据所述远端设备的接收端口的端 口号检测接收的媒体信息是否是所述远端设备发送的媒体信息。
3、 根据权利要求 1或 2所述的方法， 其特征在于， 所述媒体描 述信息还包括： 传输协议和 /或媒体格式。
4、 根据权利要求 1-3任一项所述的方法， 其特征在于， 在所述 获取本地设备的媒体描述信息之前， 还包括：
接收所述媒体转移设备发送的业务转移请求消息，所述业务转移 请求消息携带所述媒体转移设备请求进行转移的业务的信息；
检测本地网络， 确定所述本地设备， 获取所述本地设备的服务描 述信息； 所述服务描述信息是设备支持的业务的信息；
将所述服务描述信息与所述媒体转移设备进行转移的业务的信 息进行匹配；
所述获取本地设备的媒体描述信息包括：
获取所述服务描述信息与所述媒体转移设备进行转移的业务的 信息相匹配的本地设备的媒体描述信息。
5、 根据权利要求 1-4任一项所述的方法， 其特征在于， 所述获 取本地设备的媒体描述信息包括：
通过获取媒体能力消息获取本地设备的媒体描述信息。
6、 根据权利要求 1-5任一项所述的方法， 其特征在于， 所述将 所述远端设备的媒体描述信息发送至所述转移接收设备包括：
通过会话建立消息将所述远端设备的媒体描述信息发送至所述 转移接收设备。
7、 根据权利要求 1-6任一项所述的方法， 其特征在于， 所述将 媒体转移设备的媒体描述信息及所述转移接收设备的媒体描述信息 发送至网关包括：
通过会话转移消息将媒体转移设备的媒体描述信息及所述转移 接收设备的媒体描述信息发送至网关。
8、 一种媒体转移的方法， 其特征在于， 包括：
接收控制点发送的媒体转移设备的媒体描述信息及转移接收设 备的媒体描述信息；所述媒体描述信息用于指示设备的通信相关的信 息， 包括： 设备的互联网协议 IP地址、 端口号及编解码能力信息； 根据所述媒体转移设备的媒体描述信息及所述转移接收设备的 媒体描述信息更新用于与远端设备通信的地址映射表；
接收远端设备发送的媒体信息；
根据更新的用于与远端设备通信的地址映射表，将接收的所述远 端设备发送的媒体信息发送至所述转移接收设备。
9、 根据权利要求 8所述的方法， 其特征在于， 所述根据所述媒 体转移设备的媒体描述信息及所述转移接收设备的媒体描述信息更 新用于与所述远端设备通信的地址映射表包括：
根据所述媒体转移设备的媒体描述信息，将所述地址映射表中存 储的所述媒体转移设备的 IP地址及接收端口的端口号与公网的 IP地 址及端口号间的映射关系的表项删除；
根据所述转移接收设备的媒体描述信息，建立所述转移接收设备 的 IP 地址及接收端口的端口号与公网 IP 地址及端口号间的映射关 系， 并存储至所述地址映射表中。
10、 根据权利要求 8或 9所述的方法， 其特征在于， 所述接收控 制点发送的媒体转移设备的媒体描述信息及转移接收设备的媒体描 述信息包括：
通过会话转移;肖 , ¾接收控制点发送的媒体转移设备的媒体描述 信息及转移接收设备的媒体描述信息。
1 1、 根据权利要求 8- 10任一项所述的方法， 其特征在于， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据报文头 包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号； 所述源 IP 地址为所述远端设备的 IP地址； 源端口号为所述远端设备的接收端 口的端口号； 所述目的 IP地址为公网的 IP地址； 所述目的端口号为 公网的端口号；
所述根据更新的用于与远端设备通信的地址映射表，将接收的所 述远端设备发送的媒体信息发送至转移接收设备包括：
根据所述媒体信息的所述数据报文头的目的 IP地址及目的端口 号查找更新的所述用于与远端设备通信的地址映射表，确定转移接收 设备的 IP地址及接收端口的端口号；
根据所述转移接收设备的 IP地址及接收端口的端口号， 将所述 媒体信息发送至所述转移接收设备。
12、 根据权利要求 1 1所述的方法， 其特征在于， 在所述根据所 述转移接收设备的 IP地址及端口号， 将所述媒体信息发送至所述转 移接收设备之前， 还包括：
将所述媒体信息的数据报文头的目的 IP地址及目的端口号修改 为转移接收设备的 IP地址及接收端口的端口号；
所述根据所述转移接收设备的 IP地址及接收端口的端口号， 将 所述媒体信息发送至所述转移接收设备包括：
根据所述转移接收设备的 IP地址及接收端口的端口号， 将所述 修改了数据报文头的目的 IP地址及目的端口号的媒体信息发送至所 述转移接收设备。
13、 一种媒体转移的方法， 其特征在于， 包括：
向控制点发送媒体描述信息，以使得所述控制点在接收到所述媒 体描述信息后，将所述媒体描述信息与已获取的远端设备的媒体描述 信息进行匹配，在所述媒体描述信息与已获取的远端设备的媒体描述 信息相匹配的情况下， 则将所述媒体描述信息发送至网关， 以便所述 网关根据所述媒体描述信息及所述控制点发送的媒体转移设备的媒 体描述信息更新用于与所述远端设备通信的地址映射表，以便所述网 关将所述远端设备发送的媒体信息转发至所述转移接收设备；所述媒 体描述信息用于指示设备的通信相关的信息， 包括： 设备的互联网协 议 IP地址、 端口号及编解码能力信息；
接收所述网关转发的来自所述远端设备的媒体信息。
14、 根据权利要求 13所述的方法， 其特征在于， 在所述接收所 述网关转发的来自所述远端设备的媒体信息之前， 还包括：
接收所述控制点发送的远端设备的媒体描述信息；
根据所述远端设备的媒体描述信息确定所述远端设备的接收端 口的端口号，以便根据所述远端设备的接收端口的端口号检测接收的 媒体信息是否是所述远端设备发送的媒体信息。
15、 根据权利要求 14所述的方法， 其特征在于， 接收所述控制 点发送的远端设备的媒体描述信息包括：
通过会话建立消息接收所述控制点发送的远端设备的媒体描述 信息。
16、 根据权利要求 14或 15所述的方法， 其特征在于，
所述媒体信息包括： 数据报文头及数据报文体； 所述数据报文头 包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号； 所述源 IP 地址为所述远端设备的 IP地址； 所述源端口号为所述远端设备的接 收端口的端口号； 所述目的 IP地址为转移接收设备的 IP地址； 所述 目的端口号为所述转移接收设备的接收端口的端口号；
在所述接收所述网关转发的来自所述远端设备的媒体信息之后， 还包括：
检测所述媒体信息的所述数据报文头中的源端口号与根据所述 远端设备的媒体描述信息所确定的所述远端设备的接收端口的端口 号是否相同；
若检测出所述数据报文头中的源端口号与所述远端设备的接收 端口的端口号不相同， 则丟弃所述媒体信息；
若检测出所述数据报文头中的源端口号与所述远端设备的接收 端口的端口号相同， 则处理所述媒体信息。
17、 根据权利要求 13-16任一项所述的方法， 其特征在于， 所述 向控制点发送媒体描述信息包括： 向控制点发送获取媒体能力响应消息，所述获取媒体能力响应消 息中携带有所述媒体描述信息。
18、 一种媒体转移的方法， 其特征在于， 包括：
接收控制点发送的获取媒体能力消息；
向控制点发送媒体描述信息，以使得在所述控制点在确定出转移 接收设备的情况下，将所述媒体描述信息及所述转移接收设备的媒体 描述信息发送至网关，以便所述网关根据所述媒体描述信息及所述转 移接收设备的媒体描述信息更新用于与远端设备通信的地址映射表， 以便所述网关将所述远端设备发送的媒体信息转发至所述转移接收 设备； 所述媒体描述信息用于指示设备的通信相关的信息， 包括： 设 备的互联网协议 IP地址、 端口号及编解码能力信息。
19、 根据权利要求 18所述的方法， 其特征在于， 在所述向控制 点发送媒体描述信息之前， 还包括：
向所述控制点发送业务转移请求消息，所述业务转移请求消息携 带所述媒体转移设备请求进行转移的业务的信息。
20、 一种控制点， 其特征在于， 包括：
获取单元， 用于获取本地设备的媒体描述信息； 所述媒体描述信 息用于指示设备的通信相关的信息， 包括： 设备的互联网协议 IP地 址、 端口号及编解码能力信息； 其中， 所述本地设备包括： 媒体转移 设备和至少一个第一设备；
处理单元，用于将所述获取单元获取的所述至少一个第一设备的 媒体描述信息与已获取的远端设备的媒体描述信息进行匹配，根据匹 配结果从所述至少一个第一设备中确定出转移接收设备；
收发单元，用于将所述媒体转移设备的媒体描述信息及所述转移 接收设备的媒体描述信息发送至网关，以使得所述网关根据所述媒体 转移设备的媒体描述信息及所述转移接收设备的媒体描述信息更新 用于与所述远端设备通信的地址映射表，以便所述网关将所述远端设 备发送的媒体信息转发至所述转移接收设备。
21、 根据权利要求 20所述的控制点， 其特征在于，
所述收发单元，还用于将所述远端设备的媒体描述信息发送至所 述处理单元确定的所述转移接收设备，以使得所述转移接收设备根据 所述远端设备的媒体描述信息确定远端设备的接收端口的端口号，以 便根据所述远端设备的接收端口的端口号检测接收的媒体信息是否 是所述远端设备发送的媒体信息。
22、根据权利要求 20或 21所述的控制点，其特征在于，还包括： 所述收发单元，还用于接收所述媒体转移设备发送的业务转移请 求消息，所述业务转移请求消息携带所述媒体转移设备请求进行转移 的业务的信息；
检测单元， 用于检测本地网络， 确定所述本地设备；
所述获取单元，还用于获取所述检测单元确定的所述本地设备的 服务描述信息； 所述服务描述信息是设备支持的业务的信息； 述服务描述信息与所述媒体转移设备进行转移的业务的信息进行匹 配；
所述获取单元具体根据所述处理单元匹配的匹配结果，获取所述 服务描述信息与所述媒体转移设备进行转移的业务的信息相匹配的 本地设备的媒体描述信息。
23、 根据权利要求 20-22任一项所述的控制点， 其特征在于， 所述获取单元具体通过获取媒体能力消息获取本地设备的媒体 描述信息。
24、 根据权利要求 20-23任一项所述的控制点， 其特征在于， 所述收发单元具体通过会话建立消息将所述远端设备的媒体描 述信息发送至所述转移接收设备。
25、 根据权利要求 20-24任一项所述的控制点， 其特征在于， 所述收发单元具体通过会话转移消息将所述媒体转移设备的媒 体描述信息及所述转移接收设备的媒体描述信息发送至网关。
26、 一种网关， 其特征在于， 包括：
收发单元，用于接收控制点发送的媒体转移设备的媒体描述信息 及转移接收设备的媒体描述信息；所述媒体描述信息用于指示设备的 通信相关的信息， 包括： 设备的互联网协议 IP地址、 端口号及编解 码能力信息；
更新单元，用于根据所述收发单元接收的所述媒体转移设备的媒 体描述信息及所述转移接收设备的媒体描述信息更新用于与远端设 备通信的地址映射表； 所述收发单元， 还用于接收远端设备发送的媒体信息；
所述收发单元，还用于根据所述更新单元更新的用于与远端设备 通信的地址映射表，将接收的所述远端设备发送的媒体信息发送至所 述转移接收设备。
27、 根据权利要求 26所述的网关， 其特征在于，
所述更新单元具体用于，根据所述收发单元接收的所述媒体转移 设备的媒体描述信息，将所述地址映射表中存储的所述媒体转移设备 的 IP地址及接收端口的端口号与公网的 IP地址及端口号间的映射关 系的表项删除；
根据所述收发单元接收的所述转移接收设备的媒体描述信息，建 立所述转移接收设备的 IP地址及接收端口的端口号与公网 IP地址及 端口号间的映射关系， 并存储至所述地址映射表中。
28、 根据权利要求 26或 27所述的网关， 其特征在于，
所述收发单元具体通过会话转移消息接收控制点发送的媒体转 移设备的媒体描述信息及转移接收设备的媒体描述信息。
29、 根据权利要求 26-28任一项所述的网关， 其特征在于， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据报文头 包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号； 所述源 IP 地址为所述远端设备的 IP地址； 源端口号为所述远端设备的接收端 口的端口号； 所述目的 IP地址为公网的 IP地址； 所述目的端口号为 公网的端口号；
所述收发单元包括：
查找子单元，用于根据接收的所述媒体信息的所述数据报文头的 目的 IP地址及目的端口号查找所述更新单元更新的所述用于与所述 远端设备通信的地址映射表， 确定转移接收设备的 IP地址及接收端 口的端口号；
收发子单元，用于根据所述查找子单元确定的所述转移接收设备 的 IP地址及接收端口的端口号， 将所述媒体信息发送至所述转移接 收设备。
30、 根据权利要求 29所述的网关， 其特征在于，
所述更新单元，还用于将所述媒体信息的所述数据报文头的目的 IP地址及目的端口号更新为转移接收设备的 IP地址及接收端口的端 口号；
所述收发子单元具体用于，根据所述查找子单元确定的所述转移 接收设备的 IP地址及接收端口的端口号， 将所述更新单元更新后的 媒体信息发送至所述转移接收设备。
31、 一种转移接收设备， 其特征在于， 包括： 收发单元， 用于向控制点发送媒体描述信息， 以使得所述控制点 在接收到所述媒体描述信息后，将所述媒体描述信息与已获取的远端 设备的媒体描述信息进行匹配，在所述媒体描述信息与已获取的远端 设备的媒体描述信息相匹配的情况下，则将所述媒体描述信息发送至 网关，以便所述网关根据所述媒体描述信息及所述控制点发送的媒体 转移设备的媒体描述信息更新用于与所述远端设备通信的地址映射 表，以便所述网关将所述远端设备发送的媒体信息转发至所述转移接 收设备； 所述媒体描述信息用于指示设备的通信相关的信息， 包括： 设备的互联网协议 IP地址、 端口号及编解码能力信息； 所述收发单元，还用于接收网关转发的来自所述远端设备的媒体 信息。
32、 根据权利要求 31所述的设备， 其特征在于， 所述收发单元，还用于接收所述控制点发送的远端设备的媒体描 述信息；
所述转移接收设备还包括：
处理单元，用于根据所述收发单元接收的所述远端设备的媒体描 述信息确定所述远端设备的接收端口的端口号，以便根据所述远端设 备的接收端口的端口号检测接收的媒体信息是否是所述远端设备发 送的媒体信息。
33、 根据权利要求 32所述的设备， 其特征在于， 所述收发单元具体通过会话建立消息接收所述控制点发送的远 端设备的媒体描述信息。
34、 根据权利要求 32或 33所述的设备， 其特征在于， 所述媒体信息包括： 数据报文头及数据报文体； 所述数据报文头 包括： 源 IP地址、 源端口号、 目的 IP地址及目的端口号； 所述源 IP 地址为所述远端设备的 IP地址； 源端口号为所述远端设备的接收端 口的端口号； 所述目的 IP地址为转移接收设备的 IP地址； 所述目的 端口号为所述转移接收设备的接收端口的端口号；
所述处理单元，还用于检测所述收发单元接收的所述媒体信息的 所述数据报文头中的源端口号与根据所述远端设备的媒体描述信息 所确定的所述远端设备的接收端口的端口号是否相同；在检测出所述 数据报文头中的源端口号与所述远端设备的接收端口的端口号不相 同的情况下， 丟弃所述媒体信息； 在检测出所述数据报文头中的源端 口号与所述远端设备的接收端口的端口号相同的情况下，处理所述媒 体信息。
35、 根据权利要求 31 -34任一项所述的设备， 其特征在于， 所述收发单元具体通过向控制点发送获取媒体能力响应消息来 向所述控制点发送媒体描述信息，所述获取媒体能力响应消息中携带 有所述媒体描述信息。
36、 一种媒体转移设备， 其特征在于， 包括： 收发单元， 用于接收控制点发送的获取媒体能力消息；
所述收发单元，还用于向控制点发送媒体描述信息， 以使得在所 述控制点在确定出转移接收设备的情况下，将所述媒体描述信息及所 述转移接收设备的媒体描述信息发送至网关，以便所述网关根据所述 媒体描述信息及所述转移接收设备的媒体描述信息更新用于与远端 设备通信的地址映射表，以便所述网关将所述远端设备发送的媒体信 息转发至所述转移接收设备；所述媒体描述信息用于指示设备的通信 相关的信息， 包括： 设备的互联网协议 IP地址、 端口号及编解码能 力信息。
37、 根据权利要求 36所述的设备， 其特征在于， 所述收发单元，还用于在向控制点发送媒体描述信息之前， 向所 述控制点发送业务转移请求消息，所述业务转移请求； i肖息携带所述媒 体转移设备请求进行转移的业务的信息。
38、 一种媒体转移的系统， 其特征在于， 包括： 媒体转移设备， 转移接收设备， 控制点， 网关；
所述控制点为权利要求 20-25任一项所述的控制点；
所述网关为权利要求 26 - 30任一项所述的网关；
所述转移接收设备为权利要求 31 -35 任一项所述的转移接收设 备；
所述媒体转移设备为权利要求 36或 37所述的媒体转移设备。
39、 根据权利要求 38所述的系统， 其特征在于， 所述控制点集 成在所述媒体转移设备中。
40、 根据权利要求 38所述的系统， 其特征在于， 所述控制点集 成在所述转移接收设备中。
41、 根据权利要求 38-40任一项所述的系统， 其特征在于， 所述 网关集成在所述转移接收设备中。
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