WO2014032436A1 - 一种实现呼叫转移的方法、设备和系统 - Google Patents

一种实现呼叫转移的方法、设备和系统 Download PDF

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Publication number
WO2014032436A1
WO2014032436A1 PCT/CN2013/074632 CN2013074632W WO2014032436A1 WO 2014032436 A1 WO2014032436 A1 WO 2014032436A1 CN 2013074632 W CN2013074632 W CN 2013074632W WO 2014032436 A1 WO2014032436 A1 WO 2014032436A1
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WIPO (PCT)
Prior art keywords
communication device
media
transmission information
call
message
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Application number
PCT/CN2013/074632
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English (en)
French (fr)
Inventor
应益峰
周日明
Original Assignee
华为技术有限公司
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Publication of WO2014032436A1 publication Critical patent/WO2014032436A1/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
    • H04L65/1066—Session management
    • H04L65/1096—Supplementary features, e.g. call forwarding or call holding
    • 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
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • 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
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • 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
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1093—In-session procedures by adding participants; by removing participants
    • 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
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]

Definitions

  • Embodiments of the present invention relate to the field of network communications and, more particularly, to a method, apparatus, and system for implementing call forwarding. Background technique
  • the calling terminal is generally notified to the new terminal by the call control network by sending a call transfer message to the calling terminal.
  • the calling terminal initiates a call, thereby establishing a new call between the calling terminal and the newly called terminal, and releasing the call between the calling terminal and the original called terminal.
  • the call forwarding cannot be implemented through the above scheme; in addition, in the call forwarding scheme, the call control network needs to route the new call if the new call is made. If the number of the terminal is an internal number, the routing data of the internal number needs to be configured in the call control network, thereby exposing the internal number and causing a security risk.
  • Embodiments of the present invention provide a method, device, and system for implementing call forwarding, which are used to solve Calling the terminal does not support the problem of call forwarding when call forwarding is not supported, and avoids the security risk caused by exposing the internal number of the newly called terminal when the newly called terminal is an internal terminal.
  • a method for implementing call forwarding comprising:
  • the call transfer control device intercepts a call transfer message sent by the second communication device that has established the first media channel with the first communication device to the first communication device, the call transfer request including an identifier of the third communication device to indicate establishment a second media channel between the first communication device and the third communication device;
  • the call transfer control device performs media negotiation using the media transmission information of the first communication device with the third communication device identified by the identifier of the third communication device in the call transfer message, and acquires the third obtained in the media negotiation
  • the media transmission information of the communication device is transmitted to the first communication device, thereby establishing a second media channel between the first communication device and the third communication device.
  • the media transmission information by using the first communication device is in media negotiation with the third communication device identified by the identifier of the third communication device in the call forwarding message, Specifically, the call request including the media transmission information of the first communication device is sent to the third communication device, and the call response of the media transmission information including the third communication device sent by the third communication device is received.
  • the media transmission information of the third communications device that is obtained in the media negotiation is sent to the first communications device, specifically, to the first The communication device transmits a call request including media transmission information of the third communication device.
  • the sending, by the first communications device, a call request that includes media transmission information of the third communications device specifically, The first communication device sends a re-invitation RE_INVITE message, where the SDP information in the RE_INVITE message includes media transmission information of the third communication device.
  • the receiving before receiving the call transfer message sent by the second communication device that has established the first media channel with the first communication device, further includes
  • the call transfer request further includes media transmission information of the first communication device
  • the media negotiation is performed with the third communication device by using the media transmission information of the first communication device acquired from the call transfer request.
  • the call forwarding control device determines that the call forwarding message needs to be intercepted based on the identity of the third communication device included in the call forwarding message.
  • a call forwarding control device for implementing call forwarding, the call forwarding control device comprising:
  • An intercepting unit configured to intercept a call transfer message sent by the second communications device that establishes the first media channel with the first communications device to the first communications device, where the call forwarding request includes an identifier of the third communications device to indicate establishment a second media channel between the first communication device and the third communication device;
  • the first media negotiation unit is configured to utilize the media communication information of the first communication device and the third communication in the call transfer message intercepted by the intercepting unit
  • the third communication device identified by the identifier of the device performs media negotiation, and obtains media transmission information of the third communication device in the media negotiation;
  • a second media negotiation unit configured to send the media transmission information of the third communication device acquired by the first media negotiation unit to the first communication device.
  • the first media negotiation unit is configured to: send an invite INVITE message to the third communications device, where the SDP information in the INVITE message includes the first communications
  • the media of the device transmits information, and receives a temporary response or a final response sent by the third communication device, where the temporary response or the final response SDP information includes media transmission information of the third communication device.
  • the second media negotiation unit is specifically used And sending a re-invitation RE_INVITE message to the first communications device, where the SDP information in the RE_INVITE message includes media transmission information of the third communications device.
  • the call forwarding control device further includes
  • a media transmission information acquiring unit configured to receive and forward a message for establishing the first media channel, and acquire a first communication device from a message that includes the media transmission information of the first communication device that is sent by the first communications device that is received by the first communications device Media transfer information and send it to the recording unit;
  • a recording unit configured to record media transmission information of the first communication device acquired by the media transmission information acquiring unit;
  • the first media negotiation unit is specifically configured to perform media negotiation with the third communication device by using the media transmission information of the first communication device recorded by the recording unit.
  • the call transfer request further includes media transmission information of the first communication device
  • the first media negotiation unit is specifically configured to perform media negotiation with the third communication device by using the media transmission information of the first communication device acquired from the call transfer request.
  • the intercepting unit is further configured to determine, according to an identifier of the third communications device included in the call forwarding message, that the call forwarding message needs to be intercepted.
  • a system for implementing call forwarding comprising: a call forwarding control device, a second communication device and a third communication device that establish a first media channel with the first communication device,
  • the call forwarding control device is specifically the first to fifth aspects of the second aspect or the second aspect a call forwarding control device as described in a possible implementation manner;
  • the second communication device is configured to send a call transfer message to the first communication device, where the call transfer message is intercepted by the call transfer control device;
  • the third communication device is configured to perform media negotiation with the call forwarding control device, wherein the call transfer control device performs media negotiation with the third communication device by using media transmission information of the first communication device.
  • the call forwarding control device intercepts the call transfer message that the first communication device sends to the second communication device to transfer the call to the third communication device (the call forwarding target device) and controls to complete the first communication device and the first Media negotiation of the third communication device to establish a media channel between the first communication device and the third communication device, so that call forwarding can be implemented if the first communication device does not support call forwarding, and
  • the internal number of the call forwarding target device is shielded from the outside to avoid the security breach caused by exposing the internal number.
  • FIG. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • Embodiment 1 of the present invention is a schematic flow chart of a method provided by Embodiment 1 of the present invention.
  • FIG. 3 is a schematic flow chart of a method according to Embodiment A of Embodiment 1 of the present invention
  • 4 is a schematic flow chart of a method according to Embodiment B of Embodiment 1 of the present invention
  • FIG. 5 is a schematic structural diagram of a call forwarding control device according to Embodiment 2 of the present invention
  • FIG. 7 is a schematic structural diagram of another call forwarding control device according to Embodiment 3 of the present invention
  • the communication system includes a call control network 110, a call forwarding control device 120, a first communication device 130 connected to a call control network, and is connected by a call transfer control device. To the second communication device 140 and the third communication device 150 of the call control network.
  • the call control network is used for routing and forwarding call related messages, specifically IMS (IP)
  • the call forwarding control device 120 is configured to: after intercepting a call transfer message sent by the second communication device 140 that establishes the first media channel with the first communication device 130 to the first communication device 130, the call transfer message Used to instruct the transfer of the call to the third communication device 150 (ie, the call transfer target device) to perform media negotiation with the third communication device 150 using the media transmission information of the first communication device 130, and to acquire in the process of the media negotiation Media transmission information of the third communication device 150 and the A communication device 1 30 performs media negotiation to establish a second media channel between the first communication device 130 and the third communication device 150, thereby implementing a call forwarding function.
  • the call transfer message Used to instruct the transfer of the call to the third communication device 150 (ie, the call transfer target device) to perform media negotiation with the third communication device 150 using the media transmission information of the first communication device 130, and to acquire in the process of the media negotiation Media transmission information of the third communication device 150 and the A communication device 1 30 performs media negotiation to establish a second media channel between the first communication device 130 and
  • the second communication device 140 and the third communication device 150 are connected to the call control network by the call forwarding control device 120.
  • the second communication device 140 or the third communication device 150 may be an internal device of the enterprise, and correspondingly, the corresponding number may be an internal number of the enterprise.
  • the second communication device 140 or the third communication device 150 may be a communication terminal, or may be a conference server for connecting the first communication device 130 to the conference system.
  • the function of the call transfer control device 120 may be specifically implemented on the service access gateway.
  • FIG. 2 is a schematic flowchart of a method for implementing call forwarding according to Embodiment 1 of the present invention.
  • the call control network is omitted, and the call control network is located between the first communication device and the call transfer control device, and is used in Embodiment 1 Routing and forwarding messages between the first communication device and the call forwarding control device.
  • Step 210 Establish a first media channel between the first communication device and the second communication device, and communicate through the first media channel.
  • Step 220 The call transfer control device receives and intercepts a call transfer message sent by the second communication device to the first communication device, where the call transfer message includes an identifier of the third communication device, such as a number of the third communication device, which may be external. a number or an internal number) to indicate that the call is transferred to the third communication device, ie, to establish a second media channel between the first communication device and the third communication device; specifically, the call transfer control device and the second communication device Between SIP ( ses s ion The initiating protocol is performed by the initiating protocol, and the call forwarding message is specifically an SI ⁇ Refer message, and the value of the Refer-to header field of the Refer message is an identifier of the third communication device, and is used to indicate that the call is to be transferred. To the third communication device.
  • the call transfer message includes an identifier of the third communication device, such as a number of the third communication device, which may be external. a number or an internal number) to indicate that the call is transferred to the third communication device, i
  • the call transfer message is sent by the second communications device to the first communications device, and includes an identifier of the first communications device (such as the number of the first communications device).
  • the call forwarding control device The call forwarding message is forwarded to the first communication device.
  • the call forwarding control device does not forward the call transfer message to the first communication device, but intercepts the call transfer message and executes Steps 230-260.
  • the call forwarding control device may first determine whether the call forwarding message needs to be intercepted, and intercept the call forwarding message when the determination is yes. Specifically, it may be determined whether the call forwarding message needs to be intercepted according to the identifier of the third communication device included in the call transfer message, for example, determining whether the number of the third communication device included in the call transfer request belongs to the call transfer control device. The internal number of the internal device, if it is judged to be YES, intercepts the call transfer message.
  • Steps 230-240 The call transfer control device performs media negotiation by using the media transmission information of the first communication device and the third communication device identified by the identifier of the third communication device in the call transfer message, in the media negotiation process, The media transmission information of the first communication device is sent to the third communication device, and the media transmission information of the third communication device sent by the third communication device is received.
  • the media transmission information of the first communication device may include an IP address, a port number, a supported media transmission protocol, a media type, and a media format of the first communication device; the media transmission information of the third communication device may include a third communication The device's IP address, port number, supported media transport protocol, media type, and media format.
  • the call that includes the media transmission information of the first communication device is sent to the third communication device.
  • the request is received, and the call response of the third communication device, including the media transmission information of the third communication device, is received, and the call response may be a final response or a temporary response.
  • the call forwarding control device may perform media negotiation with the third communication device through the SIP protocol.
  • the call request is specifically a SIP INVITE message, and specifically, the session description protocol (SDP, ses s des des i i ion protocol) information in the SIP INVITE message includes media transmission information of the first communication device;
  • the final response may be specifically a 200 0K message, and the temporary response may be a lxx message, such as a 183 message, a 180 message, etc.
  • the third communication device is included by the SDP information in the 200 OK message or the lxx message.
  • Media transfer information is specifically a SIP INVITE message, and specifically, the session description protocol (SDP, ses s des des i i ion protocol) information in the SIP INVITE message includes media transmission information of the first communication device;
  • the final response may be specifically a 200 0K message, and the temporary response may be a lxx message, such as a 183 message, a 180 message, etc.
  • Steps 250-260 the call forwarding control device transmits the media transmission information of the third communication device acquired in the media negotiation process in steps 230-240 to the first communication device.
  • the media transmission information of the third communication device is sent to the first communication device, where the media negotiation is performed.
  • the media transmission information of the first communication device sent by the first communication device is also received in the process.
  • the call request including the media transmission information of the third communication device is sent to the first communication device, and the call response of the media transmission information including the first communication device sent by the first communication device is received.
  • the call request may be a SIP re-invitation RE-INVITE message, where the SDP information in the RE-INVITE message includes media transmission information of the third communication device, and is used to establish the first media channel.
  • the media transmission information of the second communication device sent by the communication device is updated to the media transmission information of the third communication device in the RE-INVITE message.
  • the call response may specifically be a temporary response (such as a SIP 1XX message) or a final response (such as SIP). 200 OK message), the media transmission information of the first communication device is included in the SDP information in the temporary response or the final response.
  • a temporary response such as a SIP 1XX message
  • a final response such as SIP. 200 OK message
  • the media negotiation is completed between the first communication device and the third communication device, that is, the first communication device acquires the media transmission information of the third communication device,
  • the third communication device acquires the media transmission information of the first communication device, thereby establishing a second media channel between the first communication device and the third communication device.
  • Step 270 The first communication device and the third communication device communicate through the second media channel.
  • the method further includes the step 280, the call forwarding control device sending a call end message to the second communication device, to indicate that the second communication device terminates Communication between the first communication devices.
  • call forwarding can be implemented in a case where the calling terminal does not support call forwarding, and the internal number of the third communication device can be externally shielded if the third communication device is an internal device, thereby avoiding The security risks caused by the exposure of internal numbers.
  • the call forwarding control device receives and forwards a message for implementing media negotiation between the first communication device and the third communication device, where The media negotiation is used to establish the first media channel, and obtain media transmission information of the first communication device from the received message of the first communication device that is sent by the first communication device, and record the acquired information.
  • Media transfer information of a communication device the call transfer control device performs media negotiation with the third communication device using the recorded media transmission information of the first communication device in steps 230-240.
  • the call forwarding control device intercepts the call transfer request sent by the second communication device to the first communication device according to a normal procedure and controls the device that implements the call forwarding function without requesting call forwarding (ie, the second in this embodiment) Communication equipment) make any changes.
  • the call transfer message of step 220 includes media transmission information of the first communication device, and in steps 230-240, the call transfer control device utilizes the The media transmission information of the first communication device acquired in the call transfer message is negotiated with the third communication device.
  • Embodiment 1 of the present invention two preferred embodiments of Embodiment 1 of the present invention are respectively described below with reference to FIG. 3 and FIG. 4 by taking the S IP protocol as an example.
  • the first communication device is the calling device
  • the second communication device is the first called device
  • the third communication device is the second called device.
  • the first communication device is the first called device
  • the second communication device is the calling device.
  • Embodiment A as shown in Figure 3:
  • Steps 210A-1 to 210A-2 The calling device sends an INVITE message to the first called device through the call forwarding control device, where the INVITE message includes the SDP information of the calling device (SDP1), and the SDP1 includes the media transmission of the calling device.
  • the media transmission information of the calling device may include an IP address of the calling device, a port number, a supported media transmission protocol, a media type, and a media format.
  • the call forwarding control device records the SDP1 after receiving the INVITE message including the SDP1.
  • the first called device returns a 200 OK response to the calling device through the call forwarding control device, where the 200 OK response includes SDP information (SDP2) of the first called device, and the SDP2 includes the first
  • SDP2 includes SDP information
  • the media transmission information of the called device may include an IP address, a port number, a supported media transmission protocol, a media type, and a media of the first called device. Format.
  • the media negotiation process of the foregoing step 21 OA-1 to 21 OA-4 establishes a first media channel between the calling device and the first called device, that is, between the calling device and the first called device. Conversation.
  • Step 210A-5 The calling device and the first called device communicate through the first media channel.
  • Step 220A The call forwarding control device intercepts the Refer message sent by the first called device to the calling device, where the refer message includes the calling device identifier and the identifier of the second called device, and is used to indicate that the calling device transfers the call. To the second called device, indicating to establish a second media channel between the calling device and the second called device.
  • Steps 230A-240A The call forwarding control device performs media negotiation with the second called device by using the recorded SDP1, specifically, sends an INVITE message including SDP1 to the second called device, and receives the second returned by the called device.
  • Step 25 The OA-26 OA call forwarding control device sends the SDP 3 to the calling device through the RE_INVITE message and receives the 200 OK response including the SDP1 sent by the calling device.
  • the RE-INVITE message is used to update the media transmission information of the second communication device included in the SDP 2 included in the 200 0K of step 210 A-4 to the third communication device included in the SDP 3 included in the RE-INVITE message.
  • the media transmits information.
  • the media negotiation is completed between the calling device and the second called device, that is, the calling device acquires the media transmission information of the second called device, and the second The called device obtains the media transmission information of the calling device, thereby establishing the calling device and the first The second media channel between the two called devices establishes a session between the calling device and the second called device.
  • Step 27 OA The calling device and the second called device communicate through the second media channel.
  • Step 280 A The call transfer control device sends a BYE message to the first called device to indicate that the first called device ends the session with the calling device, including terminating communication with the calling device and releasing the first A resource for a media channel.
  • the call forwarding control device intercepts a call transfer request sent by the first called device to the calling device according to a normal procedure and controls a call forwarding function, without requiring a device for requesting call forwarding (ie, The first called device in the embodiment) makes any changes.
  • Embodiment B as shown in Figure 4:
  • Steps 210B-1 to 210B-5 are similar to 210A-1 to 210A-5 and are not mentioned, except that the call forwarding control device may not record the SDP1 after receiving the INVITE message including SDP1.
  • Step 220B The first called device sends a Refer message to the calling device, where the refer message includes a calling device identifier and an identifier of the second called device, and is used to instruct the calling device to transfer the call to the second called device. That is, the second media channel between the calling device and the second called device is instructed to be established.
  • the refer message further includes an SDP1.
  • the message body of the Refer message may include the SDP1.
  • the SDP1 may be extended in the message body to indicate that the SDP information is the SDP information of the calling device.
  • Steps 230B-240B The call forwarding control device performs media negotiation with the second called device by using the SDP1 obtained from the Refer message, specifically, sends an INVITE message including the SDP1 to the second called device, and receives the second called device.
  • the returned 200 VK response includes SDP3, the SDP3 includes media transmission information of the second called device, and the media transmission information of the second called device may include the second called device. IP address, port number, supported media transport protocol, media type, and media format.
  • Steps 250B-280B are similar to 250A-280A and are not further described.
  • the call forwarding is implemented by the exemplary embodiment B of the embodiment 1 of the present invention, and the call forwarding control device does not need to record the SDP information of the calling device.
  • Embodiment B of Embodiment 1 of the present invention by the call transfer message including the media transmission information of the calling device, it is possible to prevent the call forwarding control device from recording the media of all the communication devices that have established the call for the subsequent call transfer that may occur. transmit information.
  • Embodiment 2 of the present invention proposes a call forwarding control apparatus 500.
  • the call forwarding control device 500 includes an intercepting unit 510, a first media negotiating unit 520, and a second media negotiating unit 530.
  • the intercepting unit 510 is configured to intercept a call transfer message sent by the second communications device that has established the first media channel with the first communications device to the first communications device, where the call forwarding message includes an identifier of the third communications device (such as the number of the third communication device, specifically an external number or an internal number) for indicating establishment of a second media channel between the first communication device and the third communication device; preferably, the intercepting unit further And determining to intercept the call forwarding message according to an identifier of the third communication device included in the call transfer message.
  • the call forwarding message includes an identifier of the third communications device (such as the number of the third communication device, specifically an external number or an internal number) for indicating establishment of a second media channel between the first communication device and the third communication device; preferably, the intercepting unit further And determining to intercept the call forwarding message according to an identifier of the third communication device included in the call transfer message.
  • the call forwarding message may be specifically a SIP packet, and the value of the Ref e r-10 header field of the Re f e r message is an identifier of the third communication device, and is used to indicate that the call is transferred to the third communication device.
  • the first media negotiation unit 520 is configured to perform media negotiation by using the media transmission information of the first communication device and the third communication device identified by the identifier of the third communication device in the call transfer message intercepted by the intercepting unit, and Obtaining media transmission information of the third communication device in the media negotiation; specifically, sending, to the third communication device, a call including media transmission information of the first communication device Receiving a request, and receiving a call response of the third communication device that includes the media transmission information of the third communication device, and acquiring the media transmission information of the third communication device in the call response, and sending the media transmission information to the second media negotiation unit 530.
  • the method may be specifically configured to send an invitation INVITE message to the third communications device, where the SDP information in the INVITE message includes media transmission information of the first communications device, and receives a temporary response sent by the third communications device. (such as a SIP 1XX message) or a final response (such as a SIP 200 OK message), the media transmission information of the third communication device is included in the SDP information of the temporary response or the final response.
  • a temporary response sent by the third communications device.
  • a final response such as a SIP 200 OK message
  • the second media negotiation unit 530 is configured to send the media transmission information of the third communication device acquired by the first media negotiation unit to the first communication device, specifically, to transmit information in the media using the third communication device.
  • the first communication device sends the media transmission information of the third communication device to the first communication device, and is configured to receive the media transmission information of the first communication device sent by the first communication device during the media negotiation process.
  • the method may be configured to: send a call request including media transmission information of the third communication device to the first communication device, and receive a call response that includes the media transmission information of the first communication device that is sent by the first communication device.
  • the method may be specifically configured to: send a SIP re-invitation RE-1 NV I TE message to the first communications device, where the SDP information in the RE-1 NV I TE message includes media transmission information of the third communications device, Updating media transmission information of the second communication device sent to the first communication device when the first media channel is to be established as media transmission information of the third communication device in the RE-INVITE message; the second media negotiation
  • the unit may be further configured to receive a temporary response (such as a SIP lxx message) or a final response (such as a SIP 200 OK message) sent by the first communications device, where the SDP information of the temporary response or the final response includes the first communications device.
  • the media transmits information.
  • the call transfer message further includes media transmission information of the first communication device, where the A media negotiation unit is specifically configured to perform media negotiation with the third communication device by using the media transmission information of the first communication device acquired from the call transfer message.
  • the call forwarding control device 500 further includes a media transmission information acquisition unit 540 and a recording unit 550.
  • the media transmission information acquiring unit 540 is configured to receive and forward a message for implementing media negotiation between the first communications device and the third communications device, where the media negotiation is used to establish the first media channel, and Receiving, by the received first communication device, the media transmission information including the first communication device, the media transmission information of the first communication device is sent to the recording unit 550;
  • the recording unit 550 is configured to record media transmission information of the first communication device received from the media transmission information acquiring unit 540.
  • the first media negotiation unit is specifically configured to perform media negotiation with the third communication device by using the media transmission information of the first communication device recorded by the recording unit.
  • an embodiment of the present invention provides a call forwarding control device 800, including: a processor (proces sor) 810, a communication interface (Communi cads Interface) 820, a memory 830, and a bus 840.
  • the processor 810, the communication interface 820, and the memory 830 complete communication with each other via the bus 840.
  • the communication interface 820 is configured to communicate with the network element, for example, by communicating with the first communication device through the call control network, and communicating with the second communication device and the third communication device.
  • the processor 810 is configured to execute the program 831.
  • program 831 can include program code, the program code including computer operating instructions.
  • a processor 810 a computer program for performing memory storage, specifically a central office
  • the processor (CPU, cent ra l proces s ing uni t ) is the core unit of the computer.
  • the memory 830 is configured to store the program 831.
  • the memory 830 may include a high speed RAM memory, and may also include a non-volatile memory, such as at least one disk storage crying port.
  • the program 831 may specifically include:
  • the intercepting unit 831-1 is configured to intercept a call transfer message sent by the second communications device that has established the first media channel with the first communications device to the first communications device, where the call forwarding message includes an identifier of the third communications device (such as the number of the third communication device, specifically an external number or an internal number) for indicating establishment of a second media channel between the first communication device and the third communication device; preferably, the intercepting unit further And determining to intercept the call forwarding message according to an identifier of the third communication device included in the call transfer message.
  • the call forwarding message may be specifically a S IP Refer message, and the value of the Refer-to header field of the Refer message is an identifier of the third communication device, and is used to indicate that the call is transferred to the third communication device.
  • the first media negotiating unit 831-2 is configured to perform media negotiation by using the media transmission information of the first communication device and the third communication device identified by the identifier of the third communication device in the call transfer message intercepted by the intercepting unit, and Obtaining the media transmission information of the third communication device in the media negotiation; specifically, the method may be configured to send a call request including media transmission information of the first communication device to the third communication device, and receive the third communication device The call response of the media transmission information of the third communication device is obtained, and the media transmission information of the third communication device in the call response is obtained and sent to the second media negotiation unit 831-3.
  • the method may be specifically configured to send an invitation INVITE message to the third communications device, where the SDP information in the INVITE message includes media transmission information of the first communications device, and receives a temporary response sent by the third communications device. (such as SIP 1XX message) or final response (For example, a SIP 200 OK message), the media transmission information of the third communication device is included in the SDP information of the temporary response or the final response.
  • a temporary response sent by the third communications device.
  • SIP 1XX message such as SIP 1XX message
  • final response For example, a SIP 200 OK message
  • the second media negotiation unit 831-3 is configured to send the media transmission information of the third communication device acquired by the first media negotiation unit to the first communication device, specifically, to transmit the information in the media using the third communication device.
  • the first communication device sends the media transmission information of the third communication device to the first communication device, and is configured to receive the media transmission information of the first communication device sent by the first communication device during the media negotiation process.
  • the method may be configured to: send a call request including media transmission information of the third communication device to the first communication device, and receive a call response that is sent by the first communication device and includes media transmission information of the first communication device.
  • the method may be further configured to: send a SIP re-invitation RE-INVITE message to the first communications device, where the SDP information in the RE-INVITE message includes media transmission information of the third communications device, where the The media transmission information of the second communication device sent to the first communication device when updating the media channel is the media transmission information of the third communication device in the RE-INVITE message; the second media negotiation unit may also be configured to receive The temporary response (such as a SIP lxx message) or the final response (such as a SIP 200 OK message) sent by the first communications device includes the media transmission information of the first communications device in the SDP information of the temporary response or the final response.
  • the temporary response such as a SIP lxx message
  • the final response such as a SIP 200 OK message
  • the call transfer message includes media transmission information of the first communication device
  • the first media negotiation unit 831-2 is specifically configured to use the information obtained from the call transfer message according to the instruction of the call transfer message processing unit.
  • the media transmission information of the first communication device is in media negotiation with the third communication device.
  • the call forwarding control device 800 further includes a media transmission information acquiring unit 831-4 and a recording unit 831-5.
  • the media transmission information obtaining unit 831-4 is configured to receive and forward to implement the first communication device. And a media negotiation message with the third communication device, where the media negotiation is used to establish the first media channel, and sent from the received first communication device to the message including the media transmission information of the first communication device. Obtaining media transmission information of the first communication device and transmitting the information to the recording unit 831-5;
  • the recording unit 831-5 is configured to record media transmission information of the first communication device received from the media transmission information acquiring unit 831-4.
  • the first media negotiation unit is specifically configured to perform media negotiation with the third communication device by using the media transmission information of the first communication device recorded by the recording unit.
  • each unit in the program 831 refers to the corresponding unit in Embodiment 2 of the present invention, which will not be described herein.
  • Embodiment 4 of the present invention proposes a system for implementing call forwarding.
  • the system for implementing call forwarding includes a call forwarding control device 91 0, a second communication device 920 that establishes a first media channel with the first communication device, and a third communication device 930.
  • the call forwarding control device may be the call forwarding control device provided by Embodiment 2 or 3 of the present invention; the second communication device is configured to send a call transfer message to the first communication device, where the call transfer message is Intercepted by the call forwarding control device; the third communication device is configured to perform media negotiation with the call transfer control device, where the call transfer control device utilizes media transmission information of the first communication device and the third communication The device conducts media negotiation.
  • the system for implementing call forwarding may implement call forwarding in a case where the first communication device does not support call forwarding, and may shield the third communication device from the outside when the third communication device is an internal device. Internal numbers thus avoid the security of exposing internal numbers.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the components displayed by the unit may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as a standalone product It can be stored on a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM, Random Acces s Memory), a magnetic disk or an optical disk, and the like, which can store program codes. Medium.

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Abstract

本发明实施例公开了一种实现呼叫转移的方法、设备和系统。该方法包括：呼叫转移控制设备截获第二通信设备向第一通信设备发送的要将呼叫转移给第三通信设备（呼叫转移目标设备）的呼叫转移消息，并控制完成第一通信设备和第三通信设备的媒体协商以建立第一通信设备和第三通信设备之间的媒体通道，从而可以在第一通信设备不支持呼叫转移的情况下实现呼叫转移，并且，可以在呼叫转移目标设备为内部设备的情况下向外部屏蔽呼叫转移目标设备的内部号码从而避免将内部号码暴露出来导致的安全隐患。

Description

一种实现呼叫转移的方法、 设备和系统 本申请要求于 2012年 9月 3日提交中国专利局、 申请号为 201210321555. 7、 发明名称为 "一种实现呼叫转移的方法、设备和系统" 的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
本发明实施例涉及网络通信领域， 并且更具体地， 涉及一种实现呼叫转移 的方法、 设备和系统。 背景技术
在当前的电话呼叫过程中，当原被叫终端要将主叫终端的呼叫转移到另一 个被叫终端时，一般通过向主叫终端发送呼叫转移消息指示主叫终端通过呼叫 控制网络向新被叫终端发起呼叫，从而在主叫终端与新被叫终端之间建立一路 新呼叫 , 并释放主叫终端与原被叫终端之间的呼叫。
如果主叫终端不支持呼叫转移， 即无法解析并处理呼叫转移消息， 则无法 通过上述方案实现呼叫转移； 另外， 在该呼叫转移方案中， 呼叫控制网络需要 为新呼叫进行路由，如果新被叫终端的号码是一个内部号码， 则需要在呼叫控 制网络中配置内部号码的路由数据， 从而将内部号码暴露出来而导致安全隐 患。
发明内容
本发明实施例提供一种实现呼叫转移的方法、设备和系统， 用于解决当主 叫终端不支持呼叫转移时无法实现呼叫转移的问题，并且在新被叫终端为内部 终端时避免将新被叫终端的内部号码暴露出来而导致的安全隐患。
第一方面， 提供了一种实现呼叫转移的方法， 所述方法包括：
呼叫转移控制设备截获与第一通信设备建立了第一媒体通道的第二通信 设备向所述第一通信设备发送的呼叫转移消息 ,所述呼叫转移请求包括第三通 信设备的标识以指示建立所述第一通信设备与第三通信设备之间的第二媒体 通道；
呼叫转移控制设备利用第一通信设备的媒体传输信息与所述呼叫转移消 息中的第三通信设备的标识所标识的第三通信设备进行媒体协商，并将在所述 媒体协商中获取的第三通信设备的媒体传输信息发送给第一通信设备，从而建 立第一通信设备与第三通信设备之间的第二媒体通道。
在第一方面的第一种可能的实现方式中，所述利用第一通信设备的媒体传 输信息与所述呼叫转移消息中的第三通信设备的标识所标识的第三通信设备 进行媒体协商， 具体为， 向所述第三通信设备发送包括第一通信设备的媒体传 输信息的呼叫请求，并接收所述第三通信设备发送的包括第三通信设备的媒体 传输信息的呼叫响应。
结合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 述向所述第三通信设备发送包括第一通信设备的媒体传输信息的呼叫请求，并 接收所述第三通信设备发送的包括第三通信设备的媒体传输信息的呼叫响应， 具体为， 向所述第三通信设备发送邀请 INVITE消息， 所述 INVITE消息中的会话 描述协议 SDP信息中包括第一通信设备的媒体传输信息， 并接收所述第三通信 设备发送的临时响应或最终响应，所述临时响应或最终响应的 SDP信息中包括 第三通信设备的媒体传输信息。
在第一方面的第三种可能的实现方式中，所述将在所述媒体协商中获取的 所述第三通信设备的媒体传输信息发送给第一通信设备， 具体为， 向所述第一 通信设备发送包括所述第三通信设备的媒体传输信息的呼叫请求。
结合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 述向所述第一通信设备发送包括第三通信设备的媒体传输信息的呼叫请求，具 体为， 向所述第一通信设备发送重邀请 RE_ INVITE消息， 所述 RE_INVITE消息中 的 SDP信息中包括第三通信设备的媒体传输信息。
结合第一方面或第一方面的第一种至第四种任一可能的实现方式，在第五 种可能的实现方式中，
所述接收已经与第一通信设备建立了第一媒体通道的第二通信设备发送 的呼叫转移消息之前， 还包括，
呼叫转移控制设备接收并转发用于建立所述第一媒体通道的消息 ,并从接 收的第一通信设备发送的包括第一通信设备的媒体传输信息的消息中获取第 一通信设备的媒体传输信息并记录；
所述利用第一通信设备的媒体传输信息与第三通信设备进行媒体协商，具 体为，利用所述记录的第一通信设备的媒体传输信息与第三通信设备进行媒体 协商。
结合第一方面或第一方面的第一种至第四种任一可能的实现方式，在第六 种可能的实现方式中，
所述呼叫转移请求还包括所述第一通信设备的媒体传输信息；
所述利用第一通信设备的媒体传输信息与第三通信设备进行媒体协商，具 体为 ,利用从所述呼叫转移请求中获取的第一通信设备的媒体传输信息与第三 通信设备进行媒体协商。
在第一方面的第七种可能的实现方式中，所述截获与第一通信设备建立了 第一媒体通道的第二通信设备向所述第一通信设备发送的呼叫转移消息之前， 还包括，呼叫转移控制设备根据呼叫转移消息中包括的第三通信设备的标识确 定需要截获所述呼叫转移消息。
第二方面，提供了一种实现呼叫转移的呼叫转移控制设备， 所述呼叫转移 控制设备包括：
截获单元，用于截获与第一通信设备建立了第一媒体通道的第二通信设备 向所述第一通信设备发送的呼叫转移消息，所述呼叫转移请求包括第三通信设 备的标识以指示建立所述第一通信设备与第三通信设备之间的第二媒体通道； 第一媒体协商单元，用于利用第一通信设备的媒体传输信息与截获单元所 截获的呼叫转移消息中的第三通信设备的标识所标识的第三通信设备进行媒 体协商， 并在所述媒体协商中获取第三通信设备的媒体传输信息；
第二媒体协商单元，用于将第一媒体协商单元获取的第三通信设备的媒体 传输信息发送给第一通信设备。
在第二方面的第一种可能的实现方式中， 所述第一媒体协商单元具体用 于： 向所述第三通信设备发送邀请 INVITE消息， 所述 INVITE消息中的 SDP信息 中包括第一通信设备的媒体传输信息，并接收所述第三通信设备发送的临时响 应或最终响应，所述临时响应或最终响应的 SDP信息中包括第三通信设备的媒 体传输信息。
在第二方面的第二种可能的实现方式中， 所述第二媒体协商单元具体用 于： 向所述第一通信设备发送重邀请 RE_ INVITE消息， 所述 RE_INVITE消息中的 SDP信息中包括第三通信设备的媒体传输信息。
结合第二方面或第二方面的第一种或第二种可能的实现方式 ，在第三种 可能的实现方式中， 所述呼叫转移控制设备还包括，
媒体传输信息获取单元，用于接收并转发用于建立所述第一媒体通道的消 息，并从接收的第一通信设备发送的包括第一通信设备的媒体传输信息的消息 中获取第一通信设备的媒体传输信息并发送给记录单元；
记录单元，用于记录媒体传输信息获取单元获取的第一通信设备的媒体传 输信息；
所述第一媒体协商单元，具体用于利用记录单元记录的第一通信设备的媒 体传输信息与第三通信设备进行媒体协商。
结合第二方面或第二方面的第一种或第二种可能的实现方式 ，在第四种 可能的实现方式中，
所述呼叫转移请求还包括所述第一通信设备的媒体传输信息；
所述第一媒体协商单元，具体用于利用从所述呼叫转移请求中获取的第一 通信设备的媒体传输信息与第三通信设备进行媒体协商。
在第二方面的第五种可能的实现方式中， 所述截获单元，还用于根据呼叫 转移消息中包括的第三通信设备的标识确定需要截获所述呼叫转移消息。
第三方面， 提供了一种实现呼叫转移的系统， 所述系统包括： 呼叫转移控 制设备、 与第一通信设备建立了第一媒体通道的第二通信设备和第三通信设 备，
所述呼叫转移控制设备，具体为如第二方面或第二方面的第一至第五种任 一可能的实现方式所述的呼叫转移控制设备；
所述第二通信设备， 用于向第一通信设备发送呼叫转移消息， 所述呼叫转 移消息被所述呼叫转移控制设备所截获；
所述第三通信设备， 用于与呼叫转移控制设备进行媒体协商， 其中， 所述 呼叫转移控制设备是利用第一通信设备的媒体传输信息与所述第三通信设备 进行媒体协商。
本发明实施例中，呼叫转移控制设备截获第一通信设备向第二通信设备发 送的要将呼叫转移给第三通信设备 (呼叫转移目标设备 )的呼叫转移消息并控 制完成第一通信设备和第三通信设备的媒体协商以建立第一通信设备和第三 通信设备之间的媒体通道，从而可以在第一通信设备不支持呼叫转移的情况下 实现呼叫转移， 并且， 可以在呼叫转移目标设备为内部设备的情况下向外部屏 蔽呼叫转移目标设备的内部号码从而避免将内部号码暴露出来导致的安全隐 、
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例或现有技术 描述中所需要使用的附图作简单地介绍，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是本发明实施例的系统架构示意图；
图 2是本发明实施例 1提供的方法流程示意图；
图 3是本发明实施例 1提供的实施方式 A的方法流程示意图； 图 4是本发明实施例 1提供的实施方式 B的方法流程示意图；
图 5-图 6是本发明实施例 2提供的呼叫转移控制设备的结构示意图； 图 7是本发明实施例 3提供的另一种呼叫转移控制设备的结构示意图； 图 8是本发明实施例 4提供的实现呼叫转移的系统的结构示意图。 具体实施方式
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作出创造性劳 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。
图 1为本发明实施例所涉及的一种通信系统架构示意图， 该通信系统包括 呼叫控制网络 110、呼叫转移控制设备 120、连接到呼叫控制网络的第一通信设 备 130、通过呼叫转移控制设备连接到呼叫控制网络的第二通信设备 140和第三 通信设备 150。
呼叫控制网络用于对呼叫相关消息进行路由转发， 具体可以是 IMS ( IP
Mul t imedia Subsys tem, IP多媒体系统 )网络、 NGN ( Next Genera t ion Ne twork, 下一代网络） 。
所述呼叫转移控制设备 120,用于在截获与第一通信设备 130建立了第一媒 体通道的第二通信设备 140向所述第一通信设备 130发送的呼叫转移消息后 ,所 述呼叫转移消息用于指示将呼叫转移给第三通信设备 150 (即呼叫转移目标设 备）利用第一通信设备 130的媒体传输信息与第三通信设备 150进行媒体协商， 并利用在所述媒体协商的过程中获取的第三通信设备 150的媒体传输信息与第 一通信设备 1 30进行媒体协商， 从而建立第一通信设备 1 30与第三通信设备 150 之间的第二媒体通道， 从而实现呼叫转移功能。
所述第二通信设备 140和所述第三通信设备 150， 通过呼叫转移控制设备 120连接到呼叫控制网络上。具体地， 所述第二通信设备 140或所述第三通信设 备 150可以是企业内部设备， 相应地， 所对应的号码可以是企业内部号码。 另 夕卜， 所述第二通信设备 140或第三通信设备 150可以是通信终端，也可以是用于 将第一通信设备 1 30接入会议系统的会议服务器。
在一种具体的网络部署中，如果第二通信设备 140和第三通信设备 150通过 业务接入网关连接到呼叫控制网络， 所述呼叫转移控制设备 120的功能具体可 以在业务接入网关上实现。
图 2是本发明实施例 1提供的一种实现呼叫转移的方法流程示意图。
需要说明的是， 在图 2所示的方法流程示意图及其流程描述中， 省略了呼 叫控制网络， 该呼叫控制网络位于第一通信设备和呼叫转移控制设备之间，在 实施例 1中用于对第一通信设备和呼叫转移控制设备之间的消息进行路由转 发。
步骤 210: 第一通信设备和第二通信设备之间建立第一媒体通道并通过第 一媒体通道通信；
步骤 220: 呼叫转移控制设备接收并截获第二通信设备向第一通信设备发 送的呼叫转移消息， 所述呼叫转移消息包括第三通信设备的标识（如第三通信 设备的号码， 具体可以是外部号码或内部号码）以指示将呼叫转移到第三通信 设备， 即指示建立所述第一通信设备与第三通信设备之间的第二媒体通道； 具体地， 呼叫转移控制设备与第二通信设备之间可以通过 S I P ( ses s ion ini t ia t ion protocol ,会话发起协议）进行交互，所述呼叫转移消息具体为 S I Ρ Refer消息， Refer消息的 Refer-to头域的值为第三通信设备的标识， 用于指示 将呼叫转移至第三通信设备。
需要说明的是， 所述呼叫转移消息是第二通信设备向第一通信设备发送 的， 包括第一通信设备的标识（如第一通信设备的号码）， 按照常规流程， 呼 叫转移控制设备将该呼叫转移消息转发给第一通信设备即可，在本发明实施例 1提供的技术方案中， 呼叫转移控制设备并不向第一通信设备转发该呼叫转移 消息， 而是截获该呼叫转移消息并执行步骤 230-260。
优选地， 呼叫转移控制设备还可以先判断是否需要截获所述呼叫转移消 息， 并在判断为是时截获所述呼叫转移消息。具体可以是根据呼叫转移消息中 包括的第三通信设备的标识判断是否需要截获所述呼叫转移消息，如， 判断呼 叫转移请求中包括的第三通信设备的号码是否为归属于该呼叫转移控制设备 的内部设备的内部号码， 如果判断为是则截获所述呼叫转移消息。
步骤 230-240: 呼叫转移控制设备利用第一通信设备的媒体传输信息与所 述呼叫转移消息中的第三通信设备的标识所标识的第三通信设备进行媒体协 商，在媒体协商过程中，将第一通信设备的媒体传输信息发送给第三通信设备， 并接收第三通信设备发送的第三通信设备的媒体传输信息。
所述第一通信设备的媒体传输信息可以包括第一通信设备的 IP地址、端口 号、 支持的媒体传输协议、媒体类型及媒体格式； 所述第三通信设备的媒体传 输信息可以包括第三通信设备的 IP地址、 端口号、 支持的媒体传输协议、媒体 类型及媒体格式。
具体可以是，向第三通信设备发送包括第一通信设备的媒体传输信息的呼 叫请求，并接收所述第三通信设备发送的包括第三通信设备的媒体传输信息的 呼叫响应， 所述呼叫响应具体可以是最终响应， 也可以是临时响应。
具体地 , 呼叫转移控制设备可以与第三通信设备之间通过 S I P协议进行媒 体协商。 所述呼叫请求具体为 SIP INVITE消息， 具体地， 通过所述 SIP INVITE 消息中的会话描述协议（SDP, ses s ion descr ipt ion protocol )信息包括所 述第一通信设备的媒体传输信息； 所述最终响应具体可以为 200 0K消息， 所述 临时响应具体可以为 lxx消息， 如 183消息、 180消息等， 具体地， 通过所述 200 0K消息或 lxx消息中的 SDP信息包括所述第三通信设备的媒体传输信息。
步骤 250- 260： 在步骤 250中呼叫转移控制设备将在步骤 230- 240中的媒体 协商过程中获取的第三通信设备的媒体传输信息发送给第一通信设备。
具体地， 在步骤 250-260的利用第三通信设备的媒体传输信息与第一通信 设备进行媒体协商的过程中，将第三通信设备的媒体传输信息发送给第一通信 设备，在该媒体协商过程中还接收了第一通信设备发送的第一通信设备的媒体 传输信息。
具体可以是，向第一通信设备发送包括第三通信设备的媒体传输信息的呼 叫请求，并接收所述第一通信设备发送的包括第一通信设备的媒体传输信息的 呼叫响应。
所述呼叫请求， 具体可以是 SIP重邀请 RE-INVITE消息， 所述 RE-INVITE消 息中的 SDP信息中包括第三通信设备的媒体传输信息， 用于将建立所述第一媒 体通道时向第一通信设备发送的第二通信设备的媒体传输信息更新为所述 RE-INVITE消息中的第三通信设备的媒体传输信息。
所述呼叫响应具体可以是临时响应 （如 SIP 1XX消息）或最终响应 （如 SIP 200 OK消息） ， 所述临时响应或最终响应中的 SDP信息中包括第一通信设备的 媒体传输信息。
通过步骤 2 30-250 , 在呼叫转移控制设备的控制下， 第一通信设备和第三 通信设备之间完成了媒体协商， 即， 第一通信设备获取了第三通信设备的媒体 传输信息， 第三通信设备获取了第一通信设备的媒体传输信息，从而建立了第 一通信设备与第三通信设备之间的第二媒体通道。
步骤 270： 第一通信设备和第三通信设备通过第二媒体通道通信； 可选地， 还包括步骤 280 , 呼叫转移控制设备向第二通信设备发送呼叫结 束消息， 以指示第二通信设备终止与第一通信设备之间的通信。
通过本发明实施例 1 , 可以在主叫终端不支持呼叫转移的情况下实现呼叫 转移， 并且， 可以在第三通信设备为内部设备的情况下向外部屏蔽第三通信设 备的内部号码从而避免将内部号码暴露出来导致的安全隐患。
作为本发明实施例 1的一种优选的实施方式，在步骤 21 0中， 所述呼叫转移 控制设备接收并转发用于实现第一通信设备与第三通信设备之间的媒体协商 的消息， 所述媒体协商用于建立所述第一媒体通道， 并从接收的第一通信设备 发送的包括第一通信设备的媒体传输信息的消息中获取第一通信设备的媒体 传输信息， 并记录获取的第一通信设备的媒体传输信息， 呼叫转移控制设备在 步骤 230-240中利用所述记录的第一通信设备的媒体传输信息与第三通信设备 进行媒体协商。
在该实施方式中 ,呼叫转移控制设备截获第二通信设备按照常规流程发送 给第一通信设备的呼叫转移请求并控制实现呼叫转移功能，无需请求呼叫转移 的设备 (即本实施方式中的第二通信设备）做任何改动。 作为本发明实施例 1的另一种优选的实施方式，在步骤 220的呼叫转移消息 中包括第一通信设备的媒体传输信息， 在步骤 230-240中， 所述呼叫转移控制 设备利用从所述呼叫转移消息中获取的第一通信设备的媒体传输信息与第三 通信设备进行媒体协商。
在该实施方式中， 通过呼叫转移消息包括第一通信设备的媒体传输信息， 可以避免由呼叫转移控制设备为了后续可能发生的呼叫转移而记录所有已经 建立了呼叫的通信设备的媒体传输信息。
为了更清楚地描述本发明实施例 1的方案， 下面以 S IP协议为例结合图 3和 图 4分别介绍本发明实施例 1的两种优选实施方式。
在如下两种具体的示例实施方式中，假定第一通信设备为主叫设备、第二 通信设备为第一被叫设备、 第三通信设备为第二被叫设备， 在实际应用中， 也 可以是第一通信设备为第一被叫设备、 第二通信设备为主叫设备。
实施方式 A, 如图 3所示：
步骤 210A-1至 210A-2 ： 主叫设备通过呼叫转移控制设备向第一被叫设备 发送 INVITE消息， INVITE消息中包括主叫设备的 SDP信息 （SDP1 ) , SDP1中包 括主叫设备的媒体传输信息，所述主叫设备的媒体传输信息可以包括主叫设备 的 IP地址、 端口号、 支持的媒体传输协议、 媒体类型及媒体格式。
所述呼叫转移控制设备在接收到包含 SDP1的 INVITE消息后记录所述 SDP1。 步骤 210A-3至 210A-4 ： 第一被叫设备通过呼叫转移控制设备向主叫设备 返回 200 0K响应， 200 0K响应中包括第一被叫设备的 SDP信息 （ SDP2 ) , SDP2 中包括第一被叫设备的媒体传输信息，所述第一被叫设备的媒体传输信息可以 包括第一被叫设备的 IP地址、 端口号、 支持的媒体传输协议、媒体类型及媒体 格式。
通过前述步骤 21 OA-1至 21 OA-4的媒体协商过程建立了主叫设备和第一被 叫设备之间的第一媒体通道， 即建立了主叫设备和第一被叫设备之间的会话。
步骤 210A-5 : 主叫设备和第一被叫设备通过第一媒体通道通信。
步骤 220A ：呼叫转移控制设备截获第一被叫设备向主叫设备发送的 Refer 消息， 所述 refer消息中包括主叫设备标识和第二被叫设备的标识， 用于指示 主叫设备将呼叫转移到第二被叫设备，即指示建立主叫设备和第二被叫设备之 间的第二媒体通道。
步骤 230A -240A ： 呼叫转移控制设备利用记录的 SDP1与第二被叫设备进 行媒体协商， 具体地， 向第二被叫设备发送包括 SDP1的 INVITE消息， 并接收第 二被叫设备返回的包括第二被叫设备的 SDP信息 （SDP3 ) 的 200 0K响应， SDP3 中包括第二被叫设备的媒体传输信息，所述第二被叫设备的媒体传输信息可以 包括第二被叫设备的 IP地址、 端口号、 支持的媒体传输协议、媒体类型及媒体 格式。
步骤 25 OA-26 OA 呼叫转移控制设备通过 RE_ INVITE消息将 SDP 3发送给主叫 设备并接收主叫设备发送的包括 SDP1的 200 0K响应。
RE- INVITE消息用于将步骤 210 A-4的 200 0K中包括的 SDP 2所包括的第二通 信设备的媒体传输信息更新为该 RE-INVITE消息中包括的 SDP3所包括的第三通 信设备的媒体传输信息。
通过步骤 230A至 250A,在呼叫转移控制设备的控制下， 主叫设备和第二被 叫设备之间完成了媒体协商， 即， 主叫设备获取了第二被叫设备的媒体传输信 息， 第二被叫设备获取了主叫设备的媒体传输信息，从而建立了主叫设备和第 二被叫设备之间的第二媒体通道，即建立了主叫设备和第二被叫设备之间的会 话。
步骤 27 OA： 主叫设备和第二被叫设备通过第二媒体通道通信。
步骤 280 A： 呼叫转移控制设备向第一被叫设备发送 BYE消息， 以指示第一 被叫设备结束与主叫设备之间的会话，包括终止与主叫设备之间的通信以及释 放用于第一媒体通道的资源。
在本发明实施例 1的实施方式 A中，呼叫转移控制设备截获第一被叫设备按 照常规流程发送给主叫设备的呼叫转移请求并控制实现呼叫转移功能，无需请 求呼叫转移的设备（即本实施方式中的第一被叫设备）做任何改动。
实施方式 B , 如图 4所示：
步骤 210B-1至 210B-5与 210A-1至 210A-5类似， 不再赞述， 不同点在于， 所 述呼叫转移控制设备在接收到包含 SDP1的 INVITE消息后可以不记录所述 SDP1。
步骤 220B: 第一被叫设备向主叫设备发送 Refer消息， 所述 refer消息中包 括主叫设备标识和第二被叫设备的标识，用于指示主叫设备将呼叫转移到第二 被叫设备， 即指示建立主叫设备和第二被叫设备之间的第二媒体通道。
所述 refer消息还包括 SDP1 , 具体地， 可以通过 Refer消息的消息体包括所 述 SDP1 , 优选地， 还可以在消息体中扩展一个标识表明该 SDP信息是该主叫设 备的 SDP信息。
步骤 230B-240B:呼叫转移控制设备利用从 Refer消息中获取的 SDP1与第二 被叫设备进行媒体协商，具体地，向第二被叫设备发送包括 SDP1的 INVITE消息， 并接收第二被叫设备返回的包括 SDP3的 200 0K响应， SDP3中包括第二被叫设备 的媒体传输信息，所述第二被叫设备的媒体传输信息可以包括第二被叫设备的 IP地址、 端口号、 支持的媒体传输协议、 媒体类型及媒体格式。
步骤 250B-280B与 250A-280A类似， 不再赞述。
通过本发明实施例 1的示例实施方式 B实现呼叫转移，呼叫转移控制设备无 需记录主叫设备的 SDP信息。
在本发明实施例 1的实施方式 B中，通过呼叫转移消息包括主叫设备的媒体 传输信息，可以避免由呼叫转移控制设备为了后续可能发生的呼叫转移记录所 有已经建立了呼叫的通信设备的媒体传输信息。
根据本发明实施例 1 , 本发明实施例 2提出了一种呼叫转移控制设备 500。 如图 5所示， 所述呼叫转移控制设备 500包括截获单元 510、 第一媒体协商 单元 520和第二媒体协商单元 530。
所述截获单元 510， 用于截获与第一通信设备建立了第一媒体通道的第二 通信设备向所述第一通信设备发送的呼叫转移消息，所述呼叫转移消息包括第 三通信设备的标识（如第三通信设备的号码，具体可以是外部号码或内部号码） 用于指示建立所述第一通信设备与第三通信设备之间的第二媒体通道； 优选 地， 所述截获单元，还用于根据呼叫转移消息中包括的第三通信设备的标识确 定需要截获所述呼叫转移消息。
所述呼叫转移消息具体可以为 S I P Re f e r消息， Re f e r消息的 Re f e r- 10头域 的值为第三通信设备的标识， 用于指示将呼叫转移至第三通信设备。
所述第一媒体协商单元 520 , 用于利用第一通信设备的媒体传输信息与截 获单元所截获的呼叫转移消息中的第三通信设备的标识所标识的第三通信设 备进行媒体协商， 并在所述媒体协商中获取第三通信设备的媒体传输信息； 具 体可以用于向所述第三通信设备发送包括第一通信设备的媒体传输信息的呼 叫请求，并接收所述第三通信设备发送的包括第三通信设备的媒体传输信息的 呼叫响应，并获取所述呼叫响应中的第三通信设备的媒体传输信息发送给第二 媒体协商单元 530。 进一步地， 具体可以用于向所述第三通信设备发送邀请 INVITE消息， 所述 INVITE消息中的 SDP信息中包括第一通信设备的媒体传输信 息， 并接收所述第三通信设备发送的临时响应 （如 SIP 1XX消息）或最终响应 (如 SIP 200 OK消息） ,所述临时响应或最终响应的 SDP信息中包括第三通信设 备的媒体传输信息。
所述第二媒体协商单元 530, 用于将第一媒体协商单元获取的第三通信设 备的媒体传输信息发送给第一通信设备， 具体地， 用于在利用第三通信设备的 媒体传输信息与第一通信设备进行媒体协商的过程中，将第三通信设备的媒体 传输信息发送给第一通信设备，并用于在该媒体协商过程中接收第一通信设备 发送的第一通信设备的媒体传输信息。 具体可以用于， 向第一通信设备发送包 括第三通信设备的媒体传输信息的呼叫请求，并接收所述第一通信设备发送的 包括第一通信设备的媒体传输信息的呼叫响应。 进一步地， 具体可以用于， 向 第一通信设备发送 S I P重邀请 RE- 1 NV I TE消息，所述 RE- 1 NV I TE消息中的 SDP信息 中包括第三通信设备的媒体传输信息，用于将建立所述第一媒体通道时向第一 通信设备发送的第二通信设备的媒体传输信息更新为所述 RE-INVITE消息中的 第三通信设备的媒体传输信息；所述第二媒体协商单元还可以用于接收所述第 一通信设备发送的临时响应 （如 SIP lxx消息）或最终响应 （如 SIP 200 OK消 息） ， 所述临时响应或最终响应的 SDP信息中包括第一通信设备的媒体传输信 息。
优选地， 所述呼叫转移消息还包括第一通信设备的媒体传输信息， 所述第 一媒体协商单元，具体用于利用从所述呼叫转移消息中获取的第一通信设备的 媒体传输信息与第三通信设备进行媒体协商。
优选地，如图 6所示， 所述呼叫转移控制设备 500还包括媒体传输信息获取 单元 540和记录单元 550。
所述媒体传输信息获取单元 540 , 用于接收并转发用于实现第一通信设备 与第三通信设备之间的媒体协商的消息，所述媒体协商用于建立所述第一媒体 通道，并从接收的第一通信设备发送的包括第一通信设备的媒体传输信息的消 息中获取第一通信设备的媒体传输信息并发送给记录单元 550；
所述记录单元 550 ,用于记录接收自媒体传输信息获取单元 540的第一通信 设备的媒体传输信息。
所述第一媒体协商单元，具体用于利用记录单元记录的第一通信设备的媒 体传输信息与第三通信设备进行媒体协商。
本发明实施例 2中描述的功能单元可以用来实施上述实施例 1所述的方法。 如图 7所示， 本发明实施例提供了一种呼叫转移控制设备 800 , 包括： 处理器 (proces sor) 810 , 通信接口 (Communi ca t ions Interface) 820 , 存 储器（memory) 830 , 总线 840。
处理器 810 , 通信接口 820 , 存储器 830通过总线 840完成相互间的通信。 通信接口 820 , 用于与网元通信， 如， 通过呼叫控制网络与第一通信设备 通信， 与第二通信设备、 第三通信设备通信。
处理器 810 , 用于执行程序 831。
具体地，程序 831可以包括程序代码， 所述程序代码包括计算机操作指令。 处理器 810 , 用于执行存储器存储的计算机程序， 具体可以是一个中央处 理器（CPU, cent ra l proces s ing uni t ) , 是计算机核心单元。
存储器 830, 用于存放程序 831。 存储器 830可能包含高速 RAM存储器， 也可 能还包括非易失性存储器（non- vola t i le memory ) , 例如至少一个磁盘存储 哭口 ο
程序 831具体可以包括：
截获单元 831-1， 用于截获与第一通信设备建立了第一媒体通道的第二通 信设备向所述第一通信设备发送的呼叫转移消息，所述呼叫转移消息包括第三 通信设备的标识 （如第三通信设备的号码， 具体可以是外部号码或内部号码） 用于指示建立所述第一通信设备与第三通信设备之间的第二媒体通道； 优选 地， 所述截获单元，还用于根据呼叫转移消息中包括的第三通信设备的标识确 定需要截获所述呼叫转移消息。 所述呼叫转移消息具体可以为 S IP Refer消息， Refer消息的 Refer-to头域的值为第三通信设备的标识， 用于指示将呼叫转移 至第三通信设备。
第一媒体协商单元 831-2 , 用于利用第一通信设备的媒体传输信息与截获 单元所截获的呼叫转移消息中的第三通信设备的标识所标识的第三通信设备 进行媒体协商， 并在所述媒体协商中获取第三通信设备的媒体传输信息； 具体 可以用于向所述第三通信设备发送包括第一通信设备的媒体传输信息的呼叫 请求，并接收所述第三通信设备发送的包括第三通信设备的媒体传输信息的呼 叫响应，并获取所述呼叫响应中的第三通信设备的媒体传输信息发送给第二媒 体协商单元 831-3。 进一步地， 具体可以用于向所述第三通信设备发送邀请 INVITE消息， 所述 INVITE消息中的 SDP信息中包括第一通信设备的媒体传输信 息， 并接收所述第三通信设备发送的临时响应 （如 SIP 1XX消息）或最终响应 (如 SIP 200 OK消息） ,所述临时响应或最终响应的 SDP信息中包括第三通信设 备的媒体传输信息。
第二媒体协商单元 831-3 , 用于将第一媒体协商单元获取的第三通信设备 的媒体传输信息发送给第一通信设备， 具体地， 用于在利用第三通信设备的媒 体传输信息与第一通信设备进行媒体协商的过程中，将第三通信设备的媒体传 输信息发送给第一通信设备，并用于在该媒体协商过程中接收第一通信设备发 送的第一通信设备的媒体传输信息。具体可以用于， 向第一通信设备发送包括 第三通信设备的媒体传输信息的呼叫请求，并接收所述第一通信设备发送的包 括第一通信设备的媒体传输信息的呼叫响应。 进一步地， 具体可以用于， 向第 一通信设备发送 S I P重邀请 RE- INVITE消息，所述 RE- INVITE消息中的 SDP信息中 包括第三通信设备的媒体传输信息，用于将建立所述第一媒体通道时向第一通 信设备发送的第二通信设备的媒体传输信息更新为所述 RE- INVITE消息中的第 三通信设备的媒体传输信息；所述第二媒体协商单元还可以用于接收所述第一 通信设备发送的临时响应（如 SIP lxx消息 )或最终响应（如 SIP 200 OK消息）， 所述临时响应或最终响应的 SDP信息中包括第一通信设备的媒体传输信息。
优选地， 所述呼叫转移消息包括第一通信设备的媒体传输信息， 所述第一 媒体协商单元 831-2 , 具体用于根据呼叫转移消息处理单元的指示利用从所述 呼叫转移消息中获取的第一通信设备的媒体传输信息与第三通信设备进行媒 体协商。
优选地， 所述呼叫转移控制设备 800还包括媒体传输信息获取单元 831-4 和记录单元 831-5。
所述媒体传输信息获取单元 831-4 , 用于接收并转发用于实现第一通信设 备与第三通信设备之间的媒体协商的消息，所述媒体协商用于建立所述第一媒 体通道，并从接收的第一通信设备发送的包括第一通信设备的媒体传输信息的 消息中获取第一通信设备的媒体传输信息并发送给记录单元 831 -5 ;
所述记录单元 831 -5 ,用于记录接收自媒体传输信息获取单元 831 -4的第一 通信设备的媒体传输信息。
所述第一媒体协商单元，具体用于利用记录单元记录的第一通信设备的媒 体传输信息与第三通信设备进行媒体协商。
程序 831中各单元的具体实现参见本发明实施例 2中的相应单元，在此不赘 述。
根据本发明实施例 1至 3 ,本发明实施例 4提出了一种实现呼叫转移的系统。 如图 8所示， 所述实现呼叫转移的系统包括呼叫转移控制设备 91 0、 与第一 通信设备建立了第一媒体通道的第二通信设备 920、 第三通信设备 930。
所述呼叫转移控制设备，可以是本发明实施例 2或 3提供的呼叫转移控制设 备； 所述第二通信设备， 用于向第一通信设备发送呼叫转移消息， 所述呼叫转 移消息被所述呼叫转移控制设备所截获； 所述第三通信设备， 用于与所述呼叫 转移控制设备进行媒体协商， 其中， 所述呼叫转移控制设备利用第一通信设备 的媒体传输信息与所述第三通信设备进行媒体协商。
本实施例提供的实现呼叫转移的系统，可以在第一通信设备不支持呼叫转 移的情况下实现呼叫转移， 并且， 可以在第三通信设备为内部设备的情况下向 外部屏蔽第三通信设备的内部号码从而避免将内部号码暴露出来导致的安全 。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示 例的单元及算法步骤， 能够以电子硬件、或者计算机软件和电子硬件的结合来 实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用 和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现 所描述的功能， 但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到， 为描述的方便和简洁， 上述描述 的系统、装置和单元的具体工作过程 ,可以参考前述方法实施例中的对应过程 , 在此不再赘述。
在本申请所提供的几个实施例中， 应该理解到， 所揭露的系统、 装置和方 法， 可以通过其它的方式实现。 例如， 以上所描述的装置实施例仅仅是示意性 的， 例如， 所述单元的划分， 仅仅为一种逻辑功能划分， 实际实现时可以有另 外的划分方式， 例如多个单元或组件可以结合或者可以集成到另一个系统， 或 一些特征可以忽略， 或不执行。 另一点， 所显示或讨论的相互之间的耦合或直 接耦合或通信连接可以是通过一些接口， 装置或单元的间接耦合或通信连接， 可以是电性， 机械或其它的形式。 单元显示的部件可以是或者也可以不是物理单元， 即可以位于一个地方， 或者 也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部 单元来实现本实施例方案的目的。
另外， 在本发明各个实施例中的各功能单元可以集成在一个处理单元中， 也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元 中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用 时， 可以存储在一个计算机可读取存储介质中。 基于这样的理解， 本发明的技 术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以 以软件产品的形式体现出来， 该计算机软件产品存储在一个存储介质中， 包括 若干指令用以使得一台计算机设备（可以是个人计算机， 服务器， 或者网络设 备等）执行本发明各个实施例所述方法的全部或部分步骤。 而前述的存储介质 包括： U盘、 移动硬盘、 只读存储器（ROM, Read-On ly Memory ) 、 随机存取存 储器（RAM, Random Acces s Memory ) 、 磁碟或者光盘等各种可以存储程序代 码的介质。
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 所述以权利要求的保护范围为准。

Claims

权 利 要 求
1. 一种实现呼叫转移的方法， 其特征在于， 所述方法包括：
呼叫转移控制设备截获与第一通信设备建立了第一媒体通道的第二通信设 备向所述第一通信设备发送的呼叫转移消息，所述呼叫转移请求包括第三通信 设备的标识以指示建立所述第一通信设备与第三通信设备之间的第二媒体通 道；
呼叫转移控制设备利用第一通信设备的媒体传输信息与所述呼叫转移消息 中的第三通信设备的标识所标识的第三通信设备进行媒体协商，并将在所述媒 体协商中获取的第三通信设备的媒体传输信息发送给第一通信设备，从而建立 第一通信设备与第三通信设备之间的第二媒体通道。
2.如权利要求 1所述的方法， 其特征在于，
所述利用第一通信设备的媒体传输信息与所述呼叫转移消息中的第三通信 设备的标识所标识的第三通信设备进行媒体协商， 具体为，
向所述第三通信设备发送包括第一通信设备的媒体传输信息的呼叫请求， 并接收所述第三通信设备发送的包括第三通信设备的媒体传输信息的呼叫响 应。
3.如权利要求 2所述的方法， 其特征在于，
所述向所述第三通信设备发送包括第一通信设备的媒体传输信息的呼叫请 求，并接收所述第三通信设备发送的包括第三通信设备的媒体传输信息的呼叫 响应， 具体为，
向所述第三通信设备发送邀请 INVITE消息， 所述 INVITE消息中的会话描 述协议 SDP信息中包括第一通信设备的媒体传输信息，并接收所述第三通信设 备发送的临时响应或最终响应，所述临时响应或最终响应的 SDP信息中包括第 三通信设备的媒体传输信息。
4.如权利要求 1所述的方法， 其特征在于，
所述将在所述媒体协商中获取的所述第三通信设备的媒体传输信息发送给 第一通信设备， 具体为，
向所述第一通信设备发送包括所述第三通信设备的媒体传输信息的呼叫请 求。
5. 如权利要求 4所述的方法， 其特征在于，
所述向所述第一通信设备发送包括第三通信设备的媒体传输信息的呼叫请 求， 具体为，
向所述第一通信设备发送重邀请 RE- INVITE消息， 所述 RE- INVITE消息中 的 SDP信息中包括第三通信设备的媒体传输信息。
6. 如权利要求 1-5任一所述的方法， 其特征在于，
所述接收已经与第一通信设备建立了第一媒体通道的第二通信设备发送的 呼叫转移消息之前， 还包括，
呼叫转移控制设备接收并转发用于建立所述第一媒体通道的消息， 并从接 收的第一通信设备发送的包括第一通信设备的媒体传输信息的消息中获取第 一通信设备的媒体传输信息并记录；
所述利用第一通信设备的媒体传输信息与第三通信设备进行媒体协商， 具 体为，利用所述记录的第一通信设备的媒体传输信息与第三通信设备进行媒体 协商。
7. 如权利要求 1-5任一所述的方法， 其特征在于， 所述呼叫转移请求还包括所述第一通信设备的媒体传输信息；
所述利用第一通信设备的媒体传输信息与第三通信设备进行媒体协商， 具 体为 ,利用从所述呼叫转移请求中获取的第一通信设备的媒体传输信息与第三 通信设备进行媒体协商。
8.如权利要求 1所述的方法， 其特征在于，
所述截获与第一通信设备建立了第一媒体通道的第二通信设备向所述第一 通信设备发送的呼叫转移消息之前， 还包括，
呼叫转移控制设备根据呼叫转移消息中包括的第三通信设备的标识确定需 要截获所述呼叫转移消息。
9. 一种实现呼叫转移的呼叫转移控制设备， 其特征在于， 所述呼叫转移控 制设备包括：
截获单元， 用于截获与第一通信设备建立了第一媒体通道的第二通信设备 向所述第一通信设备发送的呼叫转移消息，所述呼叫转移请求包括第三通信设 备的标识以指示建立所述第一通信设备与第三通信设备之间的第二媒体通道； 第一媒体协商单元， 用于利用第一通信设备的媒体传输信息与截获单元所 截获的呼叫转移消息中的第三通信设备的标识所标识的第三通信设备进行媒 体协商， 并在所述媒体协商中获取第三通信设备的媒体传输信息；
第二媒体协商单元， 用于将第一媒体协商单元获取的第三通信设备的媒体 传输信息发送给第一通信设备。
10. 如权利要求 9所述的呼叫转移控制设备， 其特征在于，
所述第一媒体协商单元具体用于： 向所述第三通信设备发送邀请 INVITE 消息， 所述 INVITE消息中的 SDP信息中包括第一通信设备的媒体传输信息， 并接收所述第三通信设备发送的临时响应或最终响应 ,所述临时响应或最终响 应的 SDP信息中包括第三通信设备的媒体传输信息。
11. 如权利要求 9所述的呼叫转移控制设备， 其特征在于，
所述第二媒体协商单元具体用于： 向所述第一通信设备发送重邀请 RE-INVITE消息， 所述 RE-INVITE消息中的 SDP信息中包括第三通信设备的媒 体传输信息。
12. 如权利要求 9-11任一所述的呼叫转移控制设备， 其特征在于， 所述呼 叫转移控制设备还包括，
媒体传输信息获取单元， 用于接收并转发用于建立所述第一媒体通道的消 息，并从接收的第一通信设备发送的包括第一通信设备的媒体传输信息的消息 中获取第一通信设备的媒体传输信息并发送给记录单元；
记录单元， 用于记录媒体传输信息获取单元获取的第一通信设备的媒体传 输信息；
所述第一媒体协商单元， 具体用于利用记录单元记录的第一通信设备的媒 体传输信息与第三通信设备进行媒体协商。
13. 如权利要求 9-11任一所述的呼叫转移控制设备， 其特征在于， 所述呼叫转移请求还包括所述第一通信设备的媒体传输信息；
所述第一媒体协商单元， 具体用于利用从所述呼叫转移请求中获取的第一 通信设备的媒体传输信息与第三通信设备进行媒体协商。
14. 如权利要求 9所述的呼叫转移控制设备， 其特征在于，
所述截获单元， 还用于根据呼叫转移消息中包括的第三通信设备的标识确 定需要截获所述呼叫转移消息。
15. 一种实现呼叫转移的系统， 其特征在于， 所述系统包括： 呼叫转移控 制设备、 与第一通信设备建立了第一媒体通道的第二通信设备和第三通信设 备，
所述呼叫转移控制设备，具体为如权利要求 9-14任一所述的呼叫转移控制 设备；
所述第二通信设备， 用于向第一通信设备发送呼叫转移消息， 所述呼叫转 移消息被所述呼叫转移控制设备所截获；
所述第三通信设备， 用于与呼叫转移控制设备进行媒体协商， 其中， 所述 呼叫转移控制设备是利用第一通信设备的媒体传输信息与所述第三通信设备 进行媒体协商。
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