WO2008025271A1 - Procédé, système et dispositif pour établir l'intercommunication d'un système de communication multimédia - Google Patents

Procédé, système et dispositif pour établir l'intercommunication d'un système de communication multimédia Download PDF

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Publication number
WO2008025271A1
WO2008025271A1 PCT/CN2007/070388 CN2007070388W WO2008025271A1 WO 2008025271 A1 WO2008025271 A1 WO 2008025271A1 CN 2007070388 W CN2007070388 W CN 2007070388W WO 2008025271 A1 WO2008025271 A1 WO 2008025271A1
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Prior art keywords
logical channel
media
processing device
control device
information
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PCT/CN2007/070388
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English (en)
Chinese (zh)
Inventor
Shiyong Tan
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Huawei Technologies Co., Ltd.
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Publication of WO2008025271A1 publication Critical patent/WO2008025271A1/fr

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    • 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
    • H04L65/10—Architectures or entities

Definitions

  • the present invention relates to a multimedia communication system interworking technology, and more particularly to a method, system and device for implementing intercommunication of a multimedia communication system, at least one side of which is used in an interoperable multimedia system.
  • the H.245 protocol controls the media stream. Background of the invention
  • a multimedia communication system is a network system that provides multimedia sessions, such as audio and video communications.
  • multimedia communication systems such as: H.324 networks using H.324, H.245, H.223, etc.; H.323 protocol, H.225.0 protocol, H.245 protocol, real-time transport protocol/ H.323 network such as Real Time Transmission Control Protocol (RTP/RTCP); IP Multimedia Subsystem (IMS) using Session Initiation Protocol (SIP), Session Description Protocol (SDP), RTP/RTCP, etc.
  • RTP/RTCP Real Time Transmission Control Protocol
  • IMS IP Multimedia Subsystem
  • At least one side of the interoperable multimedia system is a multimedia interworking scenario that uses the H.245 protocol to control media streams, such as H.324 and SIP network interworking, H.323 and SIP network interworking, H.324 and H. 323 network interoperability, etc.
  • the side cylinder in the multimedia interworking that uses the H.245 protocol to control the media stream is called the H.245 side.
  • the interworking between different multimedia communication systems requires the interworking of signaling and media streams, which is generally accomplished by the media control device and the media processing device under the separate architecture.
  • the media control device completes the call control, implements the interworking of the signaling, and instructs the media processing device to operate the media resource.
  • the media processing device provides the media resource, and operates the media resource according to the instruction of the media control device to implement interworking of the media stream.
  • the media control device and the media processing device interact through a media control protocol such as the H.248 protocol.
  • the H.245 protocol can be terminated on the media control device, that is, all received and sent H.245 messages are processed by the media control device or terminated on the media processing device. This document is directed to the H.245 protocol. The end of the media processing device.
  • the media control device and the media processing device are a general term in this paper, including but not limited to the Media Gateway Controller (MGC) and the Media Gateway (MGW) in the Next Generation Network (NGN), and the Wideband Code Division Multiple Access ( WCDMA) Mobile Switching Center Server (MSC Server) and Media Gateway (MGW) in the network, Media Gateway Control Function (MGCF) entity in the IMS network, and IP Multimedia-Media Gateway (IM-MGW), media resources in the IMS network Function Control (MRFC) Entity and Media Resource Function Processing (MRFP) entities, etc.
  • MCP Media Gateway Controller
  • MGW Media Gateway
  • NTN Next Generation Network
  • WCDMA Wideband Code Division Multiple Access
  • MSC Server Mobile Switching Center Server
  • MGW Media Gateway
  • MGCF Media Gateway Control Function
  • IM-MGW IP Multimedia-Media Gateway
  • MRFC IMS network Function Control
  • MRFP Media Resource Function Processing
  • FIG. 1 is a schematic diagram of a network structure in which H.324 and SIP network interworking are taken as an example in the prior art.
  • a broken line indicates signaling
  • a solid line indicates a media stream
  • a left side of a one-dot chain line is referred to as an H.245 side.
  • CS circuit domain
  • SIP side including SIP terminal and SIP communication network
  • SIP communication network can be fixed network supporting SIP multimedia call, or IMS The internet.
  • the method for realizing the interworking between the H.324 network and the SIP network is as follows: First, the H.245 side call setup is completed, the H.245 side is established, and the SIP side call setup is established. Decoding, SIP side bearer establishment, modifying SIP side media stream attributes. During the SIP side call setup process, the codec type of the SIP side is determined by the control plane signaling negotiation, and the media control device instructs the media processing device to establish the bearer on the SIP side; and on the H.245 side, the codec type cannot pass the control plane. After the H.245 side bearer is established, the media processing device and the H.324 terminal can be negotiated through the in-band H.245 signaling.
  • the H.245 negotiation process between the media processing device and the H.324 terminal is as follows: First, the capability set exchange and the master-slave decision are made, and the capability of the interworking peer is obtained through the capability set exchange, including multiplexing capability, receiving and sending various codes. Ability to decode type media, etc., in order to select the appropriate codec, multiplexing parameters, etc. when opening the logical channel; determine the interworking one through the master-slave decision process The master is the master (Master), and the other end is the slave (Slave). In this case, when the conflict occurs during the call, the selection of the master shall prevail; after that, the logical channel and the multiplex table transmission process, the logical channel and the media stream are completed.
  • the process of opening the logical channel determines the codec type and the direction of the media stream finally selected on the H.245 side, and the multiplexing table transmission process is to process the local media stream and H.245 signaling to generate H.223 multiplexing.
  • the rules of the flow inform the peer so that the peer can demultiplex the received H.223 multiplexed stream into independent media streams and H.245 signaling.
  • H.245 negotiation process refer to the related protocol, which will not be described in detail here.
  • the media processing device After the media processing device ends the process of opening the logical channel, the information of the open logical channel must be reported to the media control device.
  • the media processing device carries the opened logical channel number and the codec type in the report result information, and the media control device instructs the media processing device to modify the H.245 side logical channel and the SIP side media stream according to the information reported by the media processing device.
  • the mapping relationship that is, the audio logical channel corresponds to the audio stream on the SIP side, and the video logical channel corresponds to the video logical channel on the SIP side.
  • the logical channel defined in the H.245 protocol can be one-way or two-way.
  • the communication can use a pair of unidirectional logical channel communication or a bidirectional logical channel communication.
  • a unidirectional logical channel has only one forward logical channel number as an identifier.
  • a bidirectional logical channel is represented by a forward logical channel number and a reverse logical channel number. Whether it is a unidirectional logical channel or a bidirectional logical channel, the logical channel numbers of the receive and transmit directions are completely independent and may be the same or different.
  • the media control device can only treat the two directions as the same.
  • the logical channel opened between the H.324 terminal and the media processing device is: H.324 terminal->media processing device direction, logical channel number 1, using H.261 codec; media processing device->H.324 terminal direction , logical channel number 2, using H.263 codec, if the media processing device reports the logical channel number 1 and H.261 codec, then the media control device will indicate the media
  • the device will associate the media stream received from the SIP side with the logical channel 1 of the media processing device -> H.324 terminal direction, but in fact the media processing device -> H.324 terminal direction only has logical channel 2, resulting in H The .324 terminal is unable to receive the media stream.
  • the media processing device reports the logical channel number 2 and the H.263 codec
  • the SIP terminal cannot receive the media stream.
  • the media processing device reports the logical channel number 1 and H.261 codec, logical channel number 2, and H.263 codec
  • the media control device cannot recognize that logical channel 1 and logical channel 2 are a pair of unidirectional channels, therefore, the media The control device can only instruct the media processing device to associate the media stream received from the SIP side with the latest logical channel of the media processing device->H.324 terminal direction according to the newly received logical channel number and codec type.
  • the media control device cannot correctly instruct the media processing device to modify the H.245 side logical channel.
  • the mapping relationship with the media stream on the other side causes the call to fail, resulting in the failure of the multimedia system to communicate.
  • the media processing device reports the result of closing the logical channel process to the media control device during the interworking of the multimedia communication system, and does not carry any information about the logical channel when reporting, the media control device only Can be considered as all logical channels are closed and instruct the media processing device to close all logical channels.
  • the audio logical channel or the video logical channel needs to be turned off separately, and even the logical channel in one direction can be closed, for example, only the video logical channel in the sending direction is turned off.
  • the method of closing the logical channel in the existing interworking process cannot implement the closing of the designated logical channel during the multimedia call. Summary of the invention
  • an object of the embodiments of the present invention is to provide a method for implementing interworking of a multimedia communication system, which can use the H.245 protocol pair on at least one side of the interworking multimedia system. Under the interoperability scenario of media stream control, the successful implementation of interoperability is guaranteed.
  • Another object of the embodiments of the present invention is to provide a system for implementing interworking of a multimedia communication system, which can ensure the success of interworking in an interworking scenario in which at least one side of the interworking multimedia system controls the media stream by using the H.245 protocol. achieve.
  • a further object of the embodiments of the present invention is to provide a media processing device device and a media control device device, which can be used in an interworking scenario in which at least one side of the interworking multimedia system controls the media stream by using the H.245 protocol. Ensure the successful implementation of interoperability.
  • the method includes:
  • the media processing device and the terminal on the H.245 side complete the H.245 negotiation, and report the open logical channel information including the logical channel direction information to the media control device;
  • the media control device identifies, according to the received information of the open logical channel, the direction of the opened logical channel as receiving or transmitting, and instructs the media processing device to modify the mapping relationship between the logical channel on the H.245 side and the media stream on the other side. , to achieve interoperability.
  • a system for implementing intercommunication of a multimedia communication system in an interworking scenario of the H.245 side that controls the media stream on at least one side using at least one side, the system includes at least: a media control device and a media processing device. among them,
  • the media processing device is configured to implement H.245 negotiation with the terminal on the H.245 side, and report the open logical channel information including the logical channel direction information to the media control device;
  • the media control device is configured to: according to the received open logical channel information, identify the direction of the opened logical channel as receiving or sending, and instruct the media processing device to modify the mapping between the H.245 side logical channel and the other side of the media stream Relationship, achieve interoperability.
  • a media processing device including a negotiation module, a reporting module, and an execution module, configured to implement H.245 negotiation with a terminal on the H.245 side, where the reporting module is configured to report The logical channel information is opened by the logic channel direction information.
  • the execution module is configured to modify the mapping relationship between the H.245 side logical channel and the other side of the media stream according to the received indication to implement interworking.
  • a media control device includes a receiving and identifying module and an indicating module, wherein the receiving and identifying module is configured to: according to the received open logical channel information, identify that the opened logical channel direction is received or sent; and the indicating module is configured to send and modify The mapping between the logical channel on the H.245 side and the media stream on the other side to achieve interworking.
  • the media processing device and the terminal on the H.245 side complete the H.245 negotiation.
  • the media control device reports the open logical channel information including the logical channel direction information, and the media control device identifies, according to the received open logical channel information, the direction of the opened logical channel as receiving or transmitting, and instructs the media processing device to modify H.
  • the mapping between the .245 side logical channel and the other side of the media stream enables interworking.
  • the media control device recognizes that the opened logical channel is used for receiving or transmitting, because the logical channel direction information is included.
  • the mapping indicates that the media processing device modifies the mapping relationship between the H.245 side logical channel and the other side of the media stream, thereby ensuring successful implementation of the interworking.
  • FIG. 1 is a schematic diagram of a network structure of a H.324 and SIP network interworking in the prior art
  • FIG. 2 is a flowchart of an embodiment of interworking between a H.324 and a SIP network according to the present invention
  • FIG. 3 is an interworking between the H.324 and the SIP network of the present invention.
  • FIG. 5 is a schematic diagram of reopening a logical channel in an embodiment of interworking between H.324 and a SIP network according to the present invention
  • FIG. 6 is a schematic diagram showing the structure of a media processing device and a media control device. Mode for carrying out the invention
  • the implementation of the embodiment of the present invention is as follows: In an interworking scenario in which the media stream is controlled by using the H.245 protocol on at least one side, the media processing device and the terminal on the H.245 side complete the H.245 negotiation, and report to the media control device.
  • the logical channel information includes the logical channel direction information, and the media control device identifies, according to the received open logical channel information, the direction of the opened logical channel as receiving or transmitting, and instructs the media processing device to modify the H.245 side logical channel and the interworking.
  • the mapping between the media streams on the other side enables interworking.
  • the call flow is different, and the invention in the embodiment of the present invention has nothing to do with the specific application scenario.
  • at least one side of the interworking multimedia system uses the H.245 protocol to control the media stream, can.
  • the following is an example of interworking between the H.324 and the SIP network, and specifically describes the implementation of the method in the embodiment of the present invention.
  • Step 200 The H.324 terminal performs an H.245 negotiation process with the media processing device.
  • Step 201 The media processing device reports the logical channel information to the media control device. This information includes logical channel number, codec type, and logical channel direction.
  • the logical channel direction identifies whether the corresponding logical channel is received or transmitted.
  • the media processing device reporting the open logical channel information to the media control device can be implemented by extending a media control protocol packet such as an H.248 packet.
  • the H.248 protocol is a protocol defined by the ITU-T specifically for media resource control under a separate architecture.
  • the basic principle of the H.248 protocol is: abstracting various resources on the media processing device into terminals, and the terminals are further divided into physical terminals and temporary terminals. Physical terminals represent some physical entities with semi-permanent existence, such as time division multiplexing (TDM) time slots; temporary terminals represent common resources released after temporary application, such as RTP flows.
  • TDM time division multiplexing
  • RTP flows temporary application
  • the call connection is actually an operation on the terminal and the context, which is completed by command requests and responses between the media control device and the media processing device, and the commands include addition, modification, deletion, notification, etc.; the command parameters are called descriptions. Characters, classified as Property, Signal, Event, Statistic, and business-related parameters are logically aggregated into a Package.
  • the H.248 protocol extends the functionality of the protocol through the package, adding new functions to the protocol, and generally does not need to modify the protocol ontology, but only needs to define a new package.
  • a package can be viewed as a package of independent features. When the media processing device claims to support the package, it is equivalent to the media processing device supporting this feature.
  • the media control device can use the attributes, events, signals, statistics defined in the package. , to operate the media resources on the media processing device to implement corresponding business logic.
  • an H.245 Channel Opened event is added to the existing H.248 packet for reporting H.245 open logical channel information, and the H.245 channel open event includes at least three.
  • Parameters Logical channel number, direction, logical channel direction and codec type, as follows:
  • Event Name such as H.245 Channel Opened
  • Event ID Event ID (EventID): such as h245ChO (0x0003);
  • Parameter ID Used to identify the parameter as a logical channel number, such as lcn (0x0003)
  • Type indicates the data type of the logical channel number, which can be an integer ( Integer );
  • the range is from 1 to 65535;
  • ParameterlD Used to identify the parameter as a direction, such as dir (0x0004);
  • Type ( Type ) Enumeration type ;
  • ParameterlD Used to identify the parameter as a codec type, such as en (0x0005); Description: used to indicate the type of codec used by the media stream in the logical channel; Type: byte string ( Octet String );
  • Step 202 The media control device identifies, according to the information reported by the media processing device, that the opened logical channel direction is receiving or transmitting.
  • the media control device identifies the open logical channel as receiving or transmitting according to the value of the direction parameter in the received H.245 channel open event.
  • Step 203 Instruct the media processing device to modify the mapping relationship between the logical channel of the H.245 side and the media stream of the SIP side, that is, the audio logical channel corresponds to the audio stream on the SIP side, and the video logical channel corresponds to the video logical channel on the SIP side.
  • the two parties enter the multimedia call phase to achieve interoperability.
  • the open logical channel information reported by the media processing device to the media control device includes a logical channel direction, so that the media control device can perform logic according to the logical channel direction information.
  • the channel numbers are different, the logical channels corresponding to different logical channel numbers are respectively identified for receiving and transmitting, and the sending and receiving are a pair of unidirectional media streams; in the codec type different, the logic corresponding to the codec type is identified.
  • the channel is different from the type of codec used for receiving and transmitting.
  • the transmitting and receiving are a pair of unidirectional media streams, and the sending and receiving adopt different encoding and decoding modes. In this way, the media control device can correctly instruct the media processing device to modify the mapping relationship between the logical channel and the media stream on the other side according to the identified information, thereby successfully implementing interworking.
  • the media control device recognizes the opened logical channel for receiving or sending, because the logical channel direction information is included, The media processing device is correctly instructed to modify the mapping relationship between the H.245 side logical channel and the other side of the media stream, thereby ensuring successful implementation of the interworking.
  • the media processing device completes the process of closing the logical channel with the H.324 terminal according to the existing protocol.
  • the method for reporting the closed logical channel to the media control device is different from the existing one.
  • the media processing device carries the logical channel number and the logical channel direction in the closed logical channel information and reports the information to the media control.
  • the device so that the media control device can control the media processing device to control the media stream of the other side corresponding to the specified logical channel according to the logical channel number and the logical channel direction carried in the closed logical channel information, for example, only receiving, or Send only, or deactivate, etc.
  • the embodiment of the present invention extends the H.245 Channel Closed event in the existing H.248 packet, so that the H.245 channel close event can report the H.245 closed logical channel information.
  • the H.245 channel shutdown event includes at least two parameters: a logical channel number and a direction, that is, a logical channel direction, which are described as follows:
  • Event Name H.245 Channel Closed
  • EventID such as h245ChC (0x0002)
  • ParameterlD such as lcn (0x0003)
  • ParameterlD such as dir (0x0004)
  • H.245 channel shutdown event is defined in the existing protocol, but the H.245 channel shutdown event in the existing protocol can only report the shutdown information, and the H.245 channel shutdown event does not carry the logical channel number and The direction is the two parameters of the logical channel direction.
  • the H.324 terminal user needs to open the specified media stream logical channel
  • the media processing device completes the process of opening the logical channel with the H.324 terminal
  • the information about the open logical channel carrying the logical channel number and the codec type is reported to the media control device. It is easy to see that the media control device cannot correctly instruct the media processing device to modify the H.245 side logical channel and the other side.
  • the mapping relationship between the media streams causes the call to fail, which leads to the failure of the multimedia system to communicate.
  • the media processing device reports the information of the open logical channel that includes the logical channel direction information to the media control device, and the media control device may instruct the media processing according to the received open logical channel information.
  • the device controls the media stream on the other side corresponding to the specified logical channel, for example, only receiving, or only transmitting, or receiving and transmitting at the same time.
  • the terminal on the side that controls the media stream using the H.245 protocol in the interworking multimedia system is the H.324 terminal, the other is the SIP communication network, the terminal is the SIP terminal, the media processing device is the MGW, and the media control device For the MGC;
  • the H.324 side transceiver direction uses different video codec types.
  • FIG. 3 is a schematic diagram of opening a logical channel in an embodiment of H.324 and SIP network interworking in the present invention.
  • the MGW opens the logical channel 2, and the transmission direction of the logical channel 2
  • the codec H.263 is used; the receive direction of the logical channel 2 is codec H.261; the video stream of the SIP terminal is codec H.263.
  • the MGW opens the logical channel process, according to the existing method, regardless of the 4th logical channel number 2, codec H.263, or the logical channel number 2, codec H.261 on the MGW, the video in one direction will be blocked.
  • the information of the open logical channel reported by the MGW to the MGC includes: logical channel number 2, codec H.263, and sending direction; logical channel number 2, codec H.261, receiving direction, MGC receiving
  • the MGW is instructed to perform a one-way video codec conversion, and the H.261 video stream received from the H.324 terminal is converted into The H.263 video stream is sent to the SIP terminal, and in another direction, the MGW is instructed to transparently transmit the received H.263 video stream from the SIP terminal to the H.324 terminal.
  • the method in the embodiment of the present invention guarantees two The video communication in the direction can be performed normally.
  • FIG. 4 is a schematic diagram of closing a logical channel in an embodiment of H.324 and SIP network interworking according to the present invention.
  • a H.324 terminal user turns off the video in the sending direction (for In terms of MGW, it is the receiving direction of logical channel 2).
  • the H.324 terminal initiates the process of closing the logical channel, and closes the H.324 terminal to the video logical channel 2 in the direction of the MGW.
  • the MGW After the process of closing the logical channel is completed, the MGW only reports the information to be closed to the MGC as the closed logical channel according to the existing method. Without carrying any information about the logical channel, the media control device can only treat all logical channels as closed and instruct the media processing device to turn off all logical channels.
  • the closed logical channel information reported by the MGW to the MGC carries the logical channel number, that is, the logical channel 2, and the direction information indicating the receiving direction of the logical channel 2 is closed, so that the MGC closes the logical channel.
  • the receiving direction of 2 and instructs the MGW to change the media stream on the SIP side to one-way, that is, only the media stream is allowed to be sent from the SIP terminal to the MGW, as shown in FIG.
  • FIG. 5 is a schematic diagram of reopening a logical channel in an embodiment of H.324 and SIP network interworking according to the present invention.
  • a H.324 terminal user needs to open a video in a sending direction. (For the MGW, it is the receiving direction) to send a video stream to the SIP terminal.
  • the H.324 terminal initiates the process of opening the channel, and opens the video logical channel of the H.324 terminal to the MGW direction.
  • the ⁇ sets the logical channel number to 3, and the codec type is still the codec H.261, as shown in FIG.
  • the logical channel number and the codec type of the logical channel in the direction in which the video stream is sent and received are different. According to the existing method, the MGW cannot indicate this to the MGC.
  • the MGW reports the logical channel carrying the logical channel number, that is, the logical channel 3, the codec type, that is, the codec H.261, and the logical channel direction, that is, the receiving direction, to the MGC.
  • MGC will play according to the received logical channel
  • the open message opens logical channel 3, and the logical channel 3 is a receiving channel adopting H.261 codec, and instructs the MGW to restore (replace) the media stream on the SIP side into two-way.
  • the media processing device can flexibly realize the opening and closing of the logical channel information of the H.245 side media stream to the MGC in various situations in the interworking process, so that the MGC can perform correct follow-up. Processing.
  • the present invention further provides a system for implementing intercommunication of a multimedia communication system, and the H.245 side interworking scenario in which at least one side controls the media stream by using the H.245 protocol, the system At least include: media control devices and media processing devices. among them,
  • the media processing device is configured to implement H.245 negotiation with the terminal on the H.245 side, and report the open logical channel information including the logical channel direction information to the media control device;
  • the media control device is configured to: according to the received open logical channel information, identify the direction of the opened logical channel as receiving or sending, and instruct the media processing device to modify the mapping between the H.245 side logical channel and the other side of the media stream Relationship, achieve interoperability.
  • the media processing device is: a media gateway MGW, or an IP multimedia-media gateway IM-MGW, or a media resource function processing MRFP entity, etc.;
  • the media control device is: a media gateway controller MGC, or a mobile switching center server MSC Server , or the media gateway control function MGCF entity, or the media resource function controls the MRFC entity, and the like.
  • the media processing device is further configured to close the designated logical channel, and report the logical channel number and logical channel direction of the specified logical channel to the media control device.
  • the media control device is further configured to: according to the received closed logical channel information, instruct the media processing device to control the media stream of the other side corresponding to the designated logical channel.
  • the media processing device is further used to play Opening a designated logical channel, and reporting the information of the designated logical channel to the media control device; the media control device is further configured to: according to the received open logical channel information, instruct the media processing device to correspond to the designated logical channel The media stream on the other side is controlled.
  • FIG. 6 is a schematic structural diagram of a media processing device and a media control device, as shown in FIG. 6:
  • the media processing device includes a negotiation module, a reporting module, and an execution module, which are used to implement H.245 negotiation with the terminal on the H.245 side, where
  • the reporting module is configured to report the open logical channel information including the logical channel direction information
  • the execution module is configured to modify the mapping relationship between the H.245 side logical channel and the other side of the media stream according to the received indication, Interoperability.
  • the reporting module is further configured to report a logical channel number and a logical channel direction of the specified logical channel; the executing module is further configured to: according to the received indication, the media stream of the other side corresponding to the specified logical channel Take control.
  • the reporting module is further configured to report the information of the specified open logical channel; the executing module is further configured to control, according to the received indication, the media stream of the other side corresponding to the designated logical channel.
  • the media control device includes a receiving identification module and an indication module, where
  • a receiving and identifying module configured to identify, according to the received information of the open logical channel, an open logical channel direction to receive or send; and an indication module, configured to send and modify between the H.245 side logical channel and the other side of the media stream Mapping relationships to achieve interoperability instructions.
  • the receiving and identifying module is further configured to receive the closed logical channel information, and the indicating module is further configured to send an indication for controlling the media stream of the other side corresponding to the designated logical channel.
  • the receiving and identifying module is further configured to receive the information of the open logical channel; the indicating module is further configured to send an indication for controlling the media stream of the other side corresponding to the designated logical channel.

Abstract

L'invention concerne un procédé, un système et un dispositif pour établir l'intercommunication d'un système de communication multimédia. Dans le cas de l'intercommunication d'au moins un côté utilisant un protocole H.245 pour commander un flux multimédia, l'invention comprend les étapes suivantes : des informations ouvertes de canal logique avec des informations de direction de canal logique sont signalées à un contrôleur multimédia par un processeur multimédia après que le processeur multimédia ne s'accorde pour H.245 avec des terminaux du côté H.245, un canal logique ouvert est reconnu soit comme récepteur, soit comme émetteur sur la base des informations ouvertes de canal logique par le contrôleur multimédia, puis, une relation de corrélation entre le canal logique du côté H.245 et le flux multimédia de l'autre côté en intercommunication est modifiée par le processeur multimédia avec une indication du contrôleur multimédia, de ce fait, l'intercommunication sera établie. Selon la présente invention, en raison des informations de direction de canal logique incluses, le canal logique ouvert est reconnu soit comme récepteur, soit comme émetteur par le contrôleur multimédia, et la relation de corrélation entre le canal logique du côté H.245 et le flux multimédia de l'autre côté en intercommunication est modifiée correctement par le processeur multimédia avec une indication du contrôleur multimédia, de ce fait l'intercommunication sera établie avec succès.
PCT/CN2007/070388 2006-08-21 2007-07-31 Procédé, système et dispositif pour établir l'intercommunication d'un système de communication multimédia WO2008025271A1 (fr)

Applications Claiming Priority (2)

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CN 200610111282 CN100493023C (zh) 2006-08-21 2006-08-21 一种实现多媒体通信系统互通的方法
CN200610111282.8 2006-08-21

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CN1360780A (zh) * 1999-07-12 2002-07-24 艾利森电话股份有限公司 用于在多媒体网络节点之间交换信息的方法和系统
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