WO2008003233A1 - Procédé et dispositif d'interconnexion d'appels multimedia entre le domaine cs et le domaine ims - Google Patents

Procédé et dispositif d'interconnexion d'appels multimedia entre le domaine cs et le domaine ims Download PDF

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Publication number
WO2008003233A1
WO2008003233A1 PCT/CN2007/001993 CN2007001993W WO2008003233A1 WO 2008003233 A1 WO2008003233 A1 WO 2008003233A1 CN 2007001993 W CN2007001993 W CN 2007001993W WO 2008003233 A1 WO2008003233 A1 WO 2008003233A1
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WIPO (PCT)
Prior art keywords
domain
ims
media stream
call
media
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PCT/CN2007/001993
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English (en)
Chinese (zh)
Inventor
Geng Wang
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008003233A1 publication Critical patent/WO2008003233A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for implementing multimedia call interworking between a CS domain and an IMS domain. Background technique
  • CS DOMAIN Multimedia call service is an important service in the third generation mobile communication system, and it is one of the landmark services of the third generation mobile communication. This kind of business enables users to see the image of the other party while making a voice call, which is a business with important practical application value.
  • the WCDMA third-generation mobile communication began with the R4 version and defined a system architecture to complete various services, including video telephony services.
  • the basic network elements included in this system architecture are: user equipment UE, WCDMA system base station NODE B, WCDMA system base station controller RNC, MGW and MSG SERVER.
  • a basic networking relationship of the system architecture is shown in Figure 1.
  • UE The terminal device used by the user, often referred to as a mobile phone.
  • NODE B Mainly responsible for wireless signal transmission and reception.
  • RNC Mainly responsible for the management of the wireless access network.
  • MGW Mainly responsible for the management of various bearer resources and the actual operation of the connection network.
  • MSG SERVER It is the core of the system. It is mainly responsible for the logical control of various services, uniformly scheduling various network resources, and generating call records.
  • a interface air interface signaling channel.
  • c interface Media gateway control signaling channel.
  • d interface BICC/ISUP/SIP signaling channel.
  • the WCDMA third-generation mobile communication system provides a service called Multimedia call, which can complete the voice call function and the data communication function. Into the video phone function.
  • H.245 Multimedia Communication Control Protocol The H.245 protocol defined by ITU-T defines how to establish a multi-body flow channel through a series of negotiation within a single service data channel.
  • the terminal capability negotiation process is defined ( After the process is performed, both parties can know the media types supported by the other party, such as voice, video, etc., master-slave discrimination (determination of master-slave relationship), and multiplexing control information interaction (in order to support multiple transmissions in one service channel simultaneously) Media stream), open and close media stream channels, and more.
  • the H.245 signaling message mainly includes two categories:
  • the first is a signaling message prepared for establishing a media stream channel, including a terminal capability transmission message (TSS) and a response message, a master-slave discrimination message (MSD) and a response message, a multiplex table transmission message (MUXTBS D), and a response.
  • TSS terminal capability transmission message
  • MSD master-slave discrimination message
  • MUXTBS D multiplex table transmission message
  • the second is to open and close the signaling message of the media stream channel, including opening the media stream channel message.
  • OLC media stream channel message
  • CLC media stream channel message
  • the OLC message can establish a forward or a pair of bidirectional media stream channels at a time. If the other party opens the media stream channel command response (OLC ACK) message, the two parties successfully establish a media stream channel, and if the received media stream is opened, The channel command reject response message (OLC REJECT) or timeout did not receive a response, indicating that the media stream channel failed to be established. Closing the media stream channel also requires receiving a successful response message, indicating that the shutdown was successful.
  • H.223 low bit rate multimedia communication multiplexing protocol The H.223 protocol developed by ITU-T enables communication parties to simultaneously transmit multiple voice, video and data media streams using a single service data channel. It needs to be combined with H.245. Collaborative operation.
  • FIG. 2 it is a structural hierarchy diagram of H.223.
  • the application layer that is, the service object of H.223) is a module that provides and receives various voice, video or data (for example: a microphone of a mobile terminal, The display or camera), the lowest layer, the physical layer is a service data channel.
  • H.223 supports the use of a single physical channel to deliver multiplexed media streams.
  • Solution 1 The establishment of multimedia call in the circuit domain of WCDMA third-generation mobile communication system
  • the first phase is to complete the connection of the call in the manner of data service and establish the bearer service channel between the users.
  • the second phase after the response, the user establishes the inband mode in the bearer service channel through the terminal.
  • the signaling interaction of the media stream determines the voice, video, and/or data media streams to be established, which establishes the multimedia call.
  • the operation of establishing the media stream in the second phase is completely carried out in the band, and the related signaling does not pass through the MSC SERVER. Therefore, the MSC SERVER does not know the establishment of the media stream channel completely, and does not know which of the voice, video or data the user specifically performs.
  • Media type communication Media type communication.
  • Solution 2 The implementation method of another multimedia call in the circuit domain of the WCDMA third generation mobile communication system can also change the process of media stream negotiation from in-band to out-of-band.
  • Another method is to add a cell for media stream negotiation in the air interface signaling and the relay signaling, initiating the call: The message carries information such as the type, number of pieces, codec, and multiplexing control parameters of the media stream to be established by the calling party. Let the network or the called party return the received media stream information and the selected codec and the like in the ringing message or the call progress message, and establish a media stream when the call is answered, and realize the function of the multimedia call.
  • IMS is a new IP-based architecture proposed by WCDMAR5. It is based on SIP and provides a new session management mechanism.
  • the IMS system provides multiple opportunities for media negotiation in a session, one can be determined during the session establishment process, but the user may wish to modify the established media during the call (for example, only the voice stream is established during the session establishment process, Later I wanted to make a video call and I needed to increase the video media stream).
  • the IMS supports a media renegotiation process that enables IMS domain users to add, modify, or delete media streams for established sessions.
  • Summary of the invention The embodiment of the invention provides a method and a device for implementing a multimedia call intercommunication between a CS domain and an IMS domain, so as to implement intercommunication of multimedia calls between the CS domain and the IMS domain.
  • the method of the embodiment of the present invention includes the following steps: the bearer mode of the CS domain is reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain to implement interworking of the bearer mode; The transmission mode completes the interworking between the CS domain and the IMS domain media stream.
  • An IMS terminal includes: a reservation unit, configured to retain a bearer mode of a CS domain in a process of interworking between a CS domain and an IMS domain media stream; and a converting unit, configured to convert the bearer of the IMS domain into a CS The bearer mode of the domain to implement interworking of bearer modes.
  • An IP multimedia media gateway functional entity includes: a retaining unit, configured to retain a CS domain bearer mode in a process of interworking between a CS domain and an IMS domain media stream; and a converting unit, configured to: The bearer is converted to the bearer mode of the CS domain to implement interworking in the bearer mode.
  • the bearer mode of the CS domain is reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain, so that the bearer mode is unified, so that users in the CS domain and the IMS domain framework can perform Multimedia call.
  • 1 is a schematic structural diagram of an existing WCDMA communication system
  • Figure 2 is a schematic diagram showing the structure of the existing H.223
  • FIG. 3 is a flow chart of steps of a method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a bearer mode of converting an CS domain and an IMS domain by an IMS terminal according to an embodiment of the present invention
  • FIG. 7 is a signaling flowchart of a normal situation in which a CS domain initiates renegotiation to an IMS domain in Case 2 according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of the case where the CS domain initiates a renegotiation abnormality to the IMS domain in the second case according to the embodiment of the present invention. Signaling flow chart;
  • FIG. 9 is a signaling flowchart of a normal situation in which the IMS domain initiates renegotiation to the CS domain in the second case in the second embodiment of the present invention.
  • FIG. 11 is a signaling flowchart of the IMS domain initiating a renegotiation abnormality 2 to the CS domain in the second case according to the embodiment of the present invention
  • the embodiment of the present invention provides a method for implementing multimedia call interworking between the CS domain and the IMS domain. See Figure 3, which includes the following main steps:
  • the bearer mode of the CS domain remains unchanged, and the H.223 multiplexing mode is still adopted.
  • the method includes: the IMS terminal decomposes the H.223 multiplexed stream sent from the CS domain into independent media streams; and the IMS terminal merges the independent media streams sent to the CS domain into the H.223 multiplexed stream.
  • the IMS network side a service channel is established for each multimedia call, and the media stream is transparently transmitted in the H.223 multiplexing mode to simulate the bearer mode of the CS domain. Therefore, the interworking of the bearer mode is implemented.
  • Bearer conversion mode 2 Referring to FIG. 5, the media gateway control function entity MGCF or the IP multimedia media gateway function entity IM-MGW converts the CS domain and the IMS domain;
  • the original IMS domain bearer mode is maintained (that is, each media stream is separately transmitted), and the CS domain and the IMS domain bearer mode are mutually converted in the MGCF or the IM-MGW.
  • the bearer mode of the MGCF or the IM-MGW to convert the CS domain and the IMS domain includes: The MGCF or the IM-MGW decomposes the H.223 multiplexed stream flowing from the CS domain to the IMS domain into independent media streams, and flows independent media.
  • the IMS terminal transmits; and the MGCF or IM-MGW merges the independent media streams flowing from the IMS domain to the CS domain into H.223 multiplexed streams, and transmits the H.223 multiplexed streams to the CS terminal.
  • the CS domain uses BICC/ISUP for call control
  • the IMS domain uses SIP for session control.
  • the signaling types used by the two domains are different, the call flows have in common: There are call (session) initiation, ringing, answering, and disconnection operations.
  • the call connection process can be directly interworked. The procedure can be found in the 3GPP TS 24.228 chapter on CS and IMS interworking.
  • the main difference between the CS domain and the IMS domain multimedia call (session) is the way in which the media stream channel is established.
  • the media stream interworking has different processing depending on the CS domain media stream control signaling transmission mode.
  • Transmission mode of CS domain media stream control signaling 1 The media stream control signaling in the CS domain is transmitted in an in-band manner through the service data channel.
  • Transmission mode of CS domain media stream control signaling The media stream control signaling in the CS domain is transmitted in an out-of-band manner through a call signaling channel.
  • step S2 Combining the two bearer conversion modes in the foregoing step S2, the transmission manners of the two CS domain media flow control signaling in step S3, and the initiating multimedia calling party (CS domain user initiated, or IMS domain user initiated), including But not limited to the following seven situations.
  • the bearer mode of the CS domain and the IMS domain is converted by the IMS terminal;
  • the media stream control signaling is transmitted in an in-band manner through the industry data channel;
  • the multimedia call is initiated from the CS domain to the IMS domain, or the multimedia call is initiated from the IMS domain to the CS domain, and the interworking process includes the following steps:
  • the CS domain and the IMS domain communication parties perform media stream operations such as media stream establishment and closing in the established service channel according to the method specified in H.245, and perform multimedia communication.
  • Case 2 The bearer mode of the CS domain and the IMS domain is converted by the MGCF; the media stream control signaling in the CS domain is transmitted in an in-band manner through the service data channel; and the multimedia call is initiated from the CS domain to the IMS domain, see as shown in Figure 6, the interworking process includes the following steps:
  • Step 1 The CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as initiation, ringing, and answering of the call.
  • the MGCF may choose not to establish a media stream when initiating a call to the IMS domain (because the CS domain requires the media negotiation after the response:), or establish a connection from the MGCF to the IMS user.
  • Media stream because users usually establish media streams such as voice and/or video, just after the CS domain establishes these media streams).
  • Step 2 After the call (session) is answered, if the media stream is established on the IMS side, the corresponding media stream on the CS side is established at this time, and the media stream on the CS side is connected to the IMS side to provide the user complete.
  • the media stream channel if the establishment fails, the corresponding media stream of the IMS is removed through the renegotiation process.
  • Step 3 During the call, the CS domain may initiate an operation to open (or close) the media channel to the MS domain, and the MGCF establishes (or closes) the corresponding media stream in the IMS domain through renegotiation.
  • the MGCF replies to the CS domain to open (or close) the media stream channel success response message.
  • the CS domain initiates opening (or closing) the media stream channel to the IMS domain
  • the MGCF replies to the CS domain (or Close)
  • the media stream channel refuses to respond.
  • Step 4 During the call, the IMS domain may establish (close) the media stream to the CS domain through renegotiation, and the MGCF controls the CS domain to open (or close) the media stream.
  • the normal situation of the renegotiation includes the following steps:
  • the IMS domain initiates opening (or closing) the media stream channel to the CS domain.
  • the MGCF proxy IMS domain completes the media stream of the CS domain to be opened (or closed). If the SDP in the INVITE message indicates that multiple media streams need to be processed, this step needs to be repeated until all media streams are processed. carry out.
  • the MGCF proxy CS domain completes the subsequent media negotiation process of the IMS domain.
  • the MGCF performs media weight according to the existing regulations.
  • the IMS domain in the second abnormal situation of the renegotiation, after the IMS domain initiates the establishment of the media stream channel to the CS domain and receives the success response message, if the IMS times out or any other failure, the MGCF to the CS The domain initiates the closing of the media stream channel processing that is turned on (or turned off).
  • Step 5 Disassemble the line at the end of the call.
  • the third step and the fourth step have no fixed sequence relationship, and the third step and the fourth step can be initiated multiple times before the line is disconnected.
  • the interworking process includes the following steps: The first step, the call (session) establishment phase, completes the basic call connection of the originating, ringing, and answering of the call.
  • the establishment of the media stream channel of the CS domain must be started after the response, and the normal processing of the IMS domain starts the negotiation of the media stream when the session is initiated, and requires The media negotiation is confirmed and the media negotiation is completed before the called party answers. Because the timing of the negotiation between the two domains is inconsistent, when the IMS initiates the media negotiation, the MGCF can only presuppose a result of media negotiation with the CS domain, and reply the IMS user before the response to comply with the IMS. The session process, while the real negotiation takes place between the IMS and the CS after the response.
  • the MGCF can assume the result of media negotiation with the CS domain as follows:
  • the MGCF accepts the media stream from the IMS to the CS initiated by the IMS user, and rejects the media stream from the CS to the IMS initiated by the IMS user. (Because the CS domain user may be willing to accept the media stream from the IMS, but the process has not yet reached the stage of expressing the willingness of the CS domain. If the MGCF rejects the media stream from the IMS to the CS at this time, then when the media stream is actually negotiated later, The IMS user has to repeatedly express the desire to establish a media stream from IMS to CS in one session, and the user experience is not good.
  • the MGCF rejects all media streams that the IMS user wants.
  • the MGCF accepts all media streams desired by the IMS subscriber.
  • the MGCF establishes a media stream to the CS domain according to the pre-assumed negotiation result of the first step. If there is a media stream that needs to be established, and if the establishment fails, the MGCF initiates renegotiation in the IMS domain to tear down the corresponding established Media stream.
  • the CS domain may initiate an operation of opening (or closing) the media circulation channel to the IMS domain, and the MGCF establishes (or closes) the corresponding media stream in the IMS domain through renegotiation.
  • Step 4 During the call, the IMS domain may establish (close) the media to the CS domain through renegotiation. Stream, MGCF manipulates the CS domain to open (or close) the media stream.
  • the fifth step is to disconnect the line at the end of the call.
  • the third step and the fourth step have no fixed sequence relationship, and the third step and the fourth step can be initiated multiple times before the line is disconnected.
  • the CS domain user initiates a multimedia call to the IMS domain user, and completes the basic call connection such as initiation, ringing, and answering of the call.
  • the IMS domain may choose not to establish a media stream when the call is initiated (because the CS domain does not carry the media stream information in the IAM message that initiated the call), or choose to establish a default media stream (because usually the user is in the process of subsequent calls) Voice and (or video, etc.) media streams are created.
  • the CS domain user may have initiated the operation of establishing the media stream channel, but since the IMS needs to be able to start the media renegotiation process after the response, the MGCF may choose to temporarily reject these users from the CS domain. These requests are temporarily processed in a manner that assumes that the IMS domain user accepts these requests, first establishing a media stream channel from the CS domain to the MGCF.
  • the second step after the called user answers, the MGCF integrates the media stream channel established by the CS side or the IMS side. If some media channels are not completed, that is, only the media stream channel of the CS side or the IMS side exists, The MGCF establishes a media channel to the other side, and connects the media streams on both sides to provide a complete media stream channel for the user. If the establishment fails, the corresponding media stream on the other side that has been established is removed through the renegotiation process.
  • Step 3 The subsequent media stream re-negotiation process during the call and the disconnection process at the end of the call are basically the same as steps 3 to 5 in the above case 2, except that the H.245 message is out of band. Channel transfer.
  • Step 1 The call (session) setup phase completes the basic call connection operation such as call initiation, ringing, and answer.
  • the IMS domain initiates the media stream negotiation by carrying the media stream parameter information when the session is initiated, and requires the media negotiation to obtain the response before the called party answers. Confirm and complete media negotiation.
  • the MGCF needs to initiate a media channel establishment process to the CS domain in response to the call response, and respond to the IMS side according to the result of the success or failure of the establishment.
  • Step 1 The CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as initiation, ringing, and answering of the call.
  • the CS domain initiates a call to the IMS domain, it will carry the media information to start the media negotiation. This is consistent with the media negotiation process of the IMS domain. Therefore, only the MGCF needs to initiate a session request to the IMS domain user in the session request message.
  • the media stream information that the CS domain wants to establish when receiving the final confirmation message of the IMS domain user, feeds back the negotiation result to the CS domain through the ringing or call progress message of the CS domain, and establishes the media stream to be established.
  • the second step During the call, the CS domain user or the IMS domain user may initiate media renegotiation. Because the process is consistent, the process only needs the MGCF to perform signaling and bearer conversion on the CS domain and the IMS domain.
  • Step 7 The bearer mode of the CS domain and the IMS domain is converted by the IMS terminal; the media stream control signaling in the CS domain is transmitted in an outband manner through the call signaling channel; the media stream control signaling information is passed The call control signaling is carried in the manner of binding; the multimedia call is initiated from the IMS domain to the CS domain, and the interworking process includes the following steps: Step 1: The IMS domain user initiates a multimedia call to the CS domain user, completing the basic call connection such as initiation, ringing, and answering of the call. When the IMS domain initiates a call to the CS domain, it carries the media information to start the media negotiation. This is consistent with the media negotiation process of the IMS domain.
  • the MGCF needs to initiate a session request to the CS domain user in the session request message.
  • the media stream information that the IMS domain wants to establish is received, when the final confirmation message of the CS domain user is received, the media stream to be established is established through the feedback result of the message negotiation for the media negotiation in the IMS domain.
  • the second step During the call, the CS domain user or the IMS domain user may initiate media renegotiation. Because the process is consistent, the process only needs the MGCF to perform signaling and bearer conversion on the CS domain and the IMS domain.
  • An embodiment of the present invention further provides an IMS terminal, including: a reserved unit and a conversion unit. a reserved unit, configured to retain a CS domain loading mode during interworking between the CS domain and the IMS domain media stream;
  • the conversion unit is configured to convert the bearer of the IMS domain into a bearer mode of the CS domain, so as to implement interworking of the bearer mode. Further, the converting unit includes at least one of the following subunits: a decomposing subunit, configured to decompose the H.223 multiplexed stream sent from the CS domain into an independent media stream; and the merging subunit, for sending to the CS The independent media streams of the domain are merged into H.223 multiplexed streams.
  • An embodiment of the present invention further provides an IM-MGW, including: a reserved unit and a conversion unit. a reserved unit, configured to retain a CS domain loading mode during interworking between the CS domain and the IMS domain media stream;
  • the conversion unit is configured to convert the bearer of the IMS domain into a bearer mode of the CS domain, so as to implement interworking of the bearer mode. Further, the converting unit includes at least one of the following subunits: a decomposing subunit, configured to decompose the H.223 multiplexed stream flowing from the CS domain to the IMS domain into an independent media stream, and transmit the independent media stream to the IMS terminal.
  • the merging sub-unit is configured to merge the independent media streams flowing from the IMS domain to the CS domain into H.223 multiplexed streams, and transmit the H.223 multiplexed streams to the CS terminal.
  • V Embodiment 1 Corresponding to the above case 1, and the CS domain user initiates a multimedia call to the IMS domain user, as shown in FIG. 13, the following specific steps are included: 1 to 17, the process of the CS user initiating a call to the IMS user, the process completing the initiation, ringing, answering of the call and establishing a service data channel between the users.
  • T Embodiment 2 Corresponding to the above case 1, and the IMS domain user initiates a multimedia call to the CS domain user, as shown in FIG. 14, which includes the following specific steps:
  • Embodiment 3 Corresponding to the above case 2, and the CS domain user initiates a multimedia call to the IMS domain user, as shown in FIG. 15, the following specific steps are included:
  • the CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as originating, ringing, and answering of the call.
  • the IMS domain does not establish a media stream during media negotiation.
  • the CS domain initiates opening (or closing) the media stream channel to the IMS domain, and the IMS domain establishes (or closes) the corresponding media stream through renegotiation.
  • the IMS domain establishes (closes) the media stream to the CS domain through renegotiation, and the CS domain initiates corresponding opening (or closing) of the media stream.
  • the MGCF presupposes a result of media negotiation with the CS domain and replies to the IMS user before responding.
  • the second step (5 to 7) establishes a media stream channel to the CS domain according to the preset media negotiation result in the first step.
  • the third step (8 to 10) the CS domain initiates opening (or closing) the media stream channel to the IMS domain, IMS The domain establishes (or closes) the corresponding media stream through renegotiation. (This process is described in detail in the Signaling Interworking section above.)
  • the IMS domain establishes (closes) the media stream to the CS domain through renegotiation, and the CS domain initiates corresponding opening (or closing) of the media stream.
  • the softswitch technology based on WCDMAR4 (but not limited to WCDMA) has been matured and has been widely applied. At present, a large number of users have made video call services through the multimedia call service provided by the WCDMA R4 CS domain. As a new architecture in WCDMA, IMS represents a future development direction, which also supports multimedia calls. Since IMS is still in the process of development and perfection, it is foreseeable that WCDMAR4-based softswitch technology and IMS will coexist for a relatively long period of time.
  • the embodiment of the present invention interworks the multimedia call between the CS domain and the IMS domain from the two layers of the bearer mode and the media stream.
  • the bearer mode of the CS domain is first reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain to implement interworking of the bearer mode; further, the bearer conversion may be completed by the IMS terminal, or by IM-MGW or MGCF is completed.
  • the transmission mode of the CS domain media stream control signaling the interworking between the CS domain and the IMS domain media stream is completed correspondingly; further, the CS domain media stream control signaling transmission mode is in the inband mode through the service data channel. The transmission is carried out or in an out-of-band manner via the call signalling channel.
  • the UE maintains the bearer mode of the CS domain in the process of interworking between the CS domain and the IMS domain media stream, and converts the bearer of the IMS domain into the bearer mode of the CS domain by using the converting unit, Realize the interoperability of the load mode.
  • the UE maintains the bearer mode of the CS domain in the process of interworking between the CS domain and the IMS domain media stream, and converts the bearer of the IMS domain into the CS domain by using the converting unit.
  • the bearer mode is used to implement interworking of bearer modes.
  • the embodiments of the present invention enable multimedia calls between users in the CS domain and the IMS domain architecture, which improves the availability of the equipment of the operator, and facilitates the operator to fully exploit the potential of the existing device. Users in both architectures provide the means to make multimedia calls.
  • the spirit and scope of the invention Thus, it is intended that the present invention cover the modifications and the modifications of the invention.

Abstract

L'invention concerne un procédé et un dispositif d'interconnexion d'appels multimedia entre le domaine CS et le domaine IMS permettant de résoudre le problème rencontré par le système WCDMA courant lors de l'interconnexion d'appels multimédia entre le domaine CS et le domaine IMS. Ce procédé consiste à conserver le mode porteur mode du domaine CS, et à passer du mode porteur du domaine IMS au mode porteur du domaine CS afin d'effectuer l'interconnexion du mode porteur; et à établir l'interconnexion de flux média entre le domaine CS et le domaine IMS en conséquence, sur la base du mode transmission de la signalisation de contrôle de flux média du domaine CS.
PCT/CN2007/001993 2006-06-28 2007-06-26 Procédé et dispositif d'interconnexion d'appels multimedia entre le domaine cs et le domaine ims WO2008003233A1 (fr)

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