CN101330647B - Method for amending conversation description protocol media - Google Patents
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Abstract
The invention provides a method for modifying session description protocol media, which comprises the following steps: transmitting a session description protocol construction request message of a new terminal to an IP multifunction gateway and applying for a new local terminal session description protocol by a media gateway control unit when receiving a session description protocol media modification message from a distal terminal; determining whether or not to subject the new terminal to media flow monitor processing by a user of the IP multifunction gateway when receiving the session description protocol construction request message of the new terminal; transmitting a protocol flow to the new terminal on a real-time basis by the user to execute media flow monitor processing when determining that the media flow monitor processing is subjected to the new terminal, and informing a media gateway control unit of the media flow monitor information obtained by monitoring; and executing media switching between the session description protocol of the distal terminal and the session description protocol of the new terminal by the IP multifunction gateway when receiving the media flow monitor information, and releasing real-time transmission protocol resources corresponding to the session description protocol of the distal terminal to achieve modification and switching of SDP media on MGCF/IM-MGW.
Description
Technical field
The present invention relates to communication technical field, relate to a kind of method for amending conversation description protocol media more specifically.
Background technology
IP Multimedia System (is called for short IMS, IP Multimedia Core NetworkSubsystem) be (to be called for short 3GPP by third generation partner program, what 3rd GenerationPartnership Project) propose is a kind of based on IP (Internet Protocol, Internet protocol) the network architecture, it has made up an opening and service environment flexibly, support multimedia application, and provide abundant multimedia service for the user.IMS is based on the communication network framework of IP, irrelevant with access technology, can be GPRS (General Packet RadioService, GPRS), WCDMA (Wideband CDMA, Wideband Code Division Multiple Access (WCDMA)), CDMA2000 (Code Division Multiple Access, code division multiple access inserts), TD-SCDMA (Time-Division Synchronization CodeDivision-Multiple-Access, Time Division-Synchronous Code Division Multiple Access), WLAN (WirelessLocal Area Network, WLAN (wireless local area network)), Local Area Network, multiple packet access network such as WiMax provides voice, video, data, multimedia service.IMS territory core control network element is CSCF (Call Session Control Function, a CSCF), and CSCF realizes functions such as subscription authentication/mandate, professional triggering, route.
PSTN (Public Switched Telephone Network, public switched telephone network)/ISDN (Integrated Services Digital Network, integrated services digital network) fixed telephone network, GSM (Global System for Mobile communication such as, global system for mobile communications), networks such as CDMA, WCDMA, CDMA2000, TD-SCDMA circuit domain have then adopted traditional circuit-switched technology more, here these networks are referred to as circuit and (are called for short CS, Circuit Switched, circuit switching) territory.Circuit domain can provide voice, video and based on the data service of circuit domain for the user equally.As shown in Figure 1, for realizing circuit domain and the intercommunication of IMS territory, need dispose MGCF (Media Gateway Control Function at IMS and CS network boundary, MGCF)/IM-MGW (IP Multimedia-Media Gateway Function, IP multimedia gateway function) network element is used for finishing voice, data and multimedia call service between IMS territory and the CS territory.
Be extensive use of SIP (Session Initiated Protocol, Session initiation Protocol) agreement in the IMS territory and carry out signaling control, it is mutual that use SDP agreement is carried out media information.Defined offer and the answer interactive mode of SDP in RFC3264 (Request For Comment, request comment), this mode is that a side initiates the request to the opposing party from capability set own, and the opposing party responds current request from capability set own.This agreement is regarded as SDP interactive mode indispensable in the IMS territory by consensus standard tissues such as 3GPP, ITU, TISPAN.8.3 joints in RFC3264 have been described the related content of SDP media modification.Media modification can comprise IP address, port and transmission property, media modification request initiator can initiate the medium request on new IP address or port, at this moment the requesting party need prepare receiving media stream on new IP address or the port and old IP address or port, can not stop at receiving media stream on old IP address or the port until received replying and received Media Stream on new IP address or port of SDP.The recipient only just stops at old IP address or the monitoring on the port also preparing simultaneously receiving media stream on new and old IP address or port after the request of receiving media modification after receiving Media Stream on new IP address or the port.
Be not described in the existing standard and realize in the MGCF/IM-MGW network element that the SDP Media Stream revises, also since among the MGCF/IM-MGW signaling control and medium control be to be separated, MGCF controls modification and the switching that IM-MGW finishes medium by agreement H.248.But H.248 do not have to monitor with medium the definition and the explanation of associated packet in the agreement, the IM-MGW everything must be controlled by MGCF, must expand H.248 agreement so want to realize in the MGCF/IM-MGW network element SDP Media Stream modify feature.
Summary of the invention
In view of the above problems, the invention provides a kind of method for amending conversation description protocol media, realize media modification by media gateway controlling unit controls IP multimedia gateway, on MGCF/IM-MGW, realize the modification and the switching of SDP medium Session Description Protocol.
Method for amending conversation description protocol media of the present invention may further comprise the steps: step 1, when the amending conversation description protocol media message of far-end is received in the media gateway controlling unit, the Session Description Protocol that sends new terminal to the multi-functional gateway of IP is set up request message and is applied for new local terminal Session Description Protocol, step 2, when the multi-functional gateway of IP receives that the Session Description Protocol of new terminal is set up request message, the user of the multi-functional gateway of IP determines whether that new terminal is enabled media stream monitoring to be handled, step 3, when determining new terminal enabled media stream monitoring and handle, the user carries out the media stream monitoring processing to the RTP stream of new terminal, and the media stream monitoring message informing that monitoring is obtained is given the media gateway controlling unit, and step 4, when receiving media stream monitoring message, the multi-functional gateway of IP is carried out the medium hand-off process between the Session Description Protocol of the Session Description Protocol of far-end and new terminal, and discharges the real-time transmission protocol resource of the Session Description Protocol correspondence of far-end.
Wherein, the media stream monitoring processing is to realize by expansion GB/BNCChange H.248.Media stream monitoring message is used to monitor the speech frame of non-quiet frame and non-NULL frame.The amending conversation description protocol media message of far-end comprises the descriptor of the Session Description Protocol of far-end at least.
Handle below in step 1, also carrying out: after the media gateway controlling unit receives the amending conversation description protocol media message of far-end, the media gateway controlling unit returns an acknowledge message, thus prevent far-end amending conversation description protocol media message repeat transmit.
The medium hand-off process comprises: when the media gateway controlling unit monitors arrives the efficient real time host-host protocol stream of new terminal, determine that former local terminal address is invalid; The media gateway controlling unit uses new local terminal address to replace former local terminal address; Use the renewal far-end address to replace the far-end address that new far-end address is switched as needs; And receiving media flows on new local terminal address, and carries out the media stream monitoring processing to upgrading local terminal.
The medium hand-off process comprises: when the media gateway controlling unit did not monitor the efficient real time host-host protocol stream of new terminal, no longer local terminal was upgraded in application; Use and newly originally bring in the efficient media stream that far-end is upgraded in monitoring, and confirm that new far-end address is invalid; And receiving media flows on former local terminal, and new local terminal is carried out media stream monitoring handle.
Thereby, adopt the present invention, MGCF realizes the monitoring of this medium and switches by control IM-MGW and can be interrupted impression because the voice that the media modification of SDP causes switch to user's shielding, can avoid problem such as losing because medium switch the efficient media that causes, and improved user satisfaction greatly.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the network site schematic diagram of MGCF/IM-MGW of the present invention;
Fig. 2 is the flow chart according to method for amending conversation description protocol media of the present invention;
Fig. 3 is the schematic diagram that the terminal on IM-MGW is switched;
Fig. 4 is the diagrammatic sketch that MGCF and IM-MGW realize the Incoming signaling process of SDP media modification;
Fig. 5 realizes the diagrammatic sketch of a kind of nested procedure that the SDP medium are repeatedly revised for MGCF and IM-MGW; And
Fig. 6 realizes the diagrammatic sketch of a kind of nested procedure that the SDP medium are repeatedly revised for MGCF and IM-MGW.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 2 is the flow chart according to method for amending conversation description protocol media of the present invention, and as shown in Figure 2, this method may further comprise the steps:
S202, when the amending conversation description protocol media message of far-end was received in the media gateway controlling unit, the Session Description Protocol that sends new terminal to the multi-functional gateway of IP was set up request message and is applied for new local terminal Session Description Protocol,
S204, when the multi-functional gateway of IP received that the Session Description Protocol of new terminal is set up request message, the user of the multi-functional gateway of IP determined whether that new terminal is enabled media stream monitoring to be handled;
S206, when determining new terminal enabled media stream monitoring and handle, the user carries out media stream monitoring to the RTP stream of new terminal and handles, and gives the media gateway controlling unit with the media stream monitoring message informing that monitoring obtains; And
S208, when receiving media stream monitoring message, the multi-functional gateway of IP is carried out the medium hand-off process between the Session Description Protocol of the Session Description Protocol of far-end and new terminal, and discharges the real-time transmission protocol resource of the Session Description Protocol correspondence of far-end.
Wherein, the media stream monitoring processing is that the GB/BNCChange of (Gateway ControlProtocol MGCP) realizes by expanding H.248.Media stream monitoring message is used to monitor the speech frame of non-quiet frame and non-NULL frame.The amending conversation description protocol media message of far-end comprises the descriptor of the Session Description Protocol of far-end at least.
Handle below in step S202, also carrying out: after the media gateway controlling unit receives the amending conversation description protocol media message of far-end, the media gateway controlling unit returns an acknowledge message, thus prevent far-end amending conversation description protocol media message repeat transmit.
The medium hand-off process comprises: when the media gateway controlling unit monitors arrives the efficient real time host-host protocol stream of new terminal, determine that former local terminal address is invalid; The media gateway controlling unit uses new local terminal address to replace former local terminal address; Use the renewal far-end address to replace the far-end address that new far-end address is switched as needs; And receiving media flows on new local terminal address, and carries out the media stream monitoring processing to upgrading local terminal.
Alternatively, the medium hand-off process comprises: when the media gateway controlling unit did not monitor the efficient real time host-host protocol stream of new terminal, no longer local terminal was upgraded in application; Use and newly originally bring in the efficient media stream that far-end is upgraded in monitoring, and confirm that new far-end address is invalid; And receiving media flows on former local terminal, and new local terminal is carried out media stream monitoring handle.
Fig. 3 is the network site schematic diagram according to the MGCF/IM-MGW of the embodiment of the invention, and as shown in Figure 3: T0 is the terminal of CS side, and T1 is the old terminal of IMS side, and T2 is the new terminal of IMS side.When having medium to switch, only there is not T1, the relation of continuing is that T0 and T1 are the sendrecv state, this state is two-way intercommunication state, if in same context, T2 will occur when having existed medium to switch, continuing, to close be that T2 is the isolate state, and this state is the Media Stream that isolated state can not receive any direction.When the topological relation that will revise terminal room after monitoring the far-end rtp streaming on the T2 terminal, T1 is the isolate state, and T0 and T2 are the sendrecv state.Then the T1 terminal is with deleted.
BNCChange (change of Bearer Networkconnection change bearer network connection attribute) incident in the GB that defines in the expansion ITU-Q1950 agreement (the general carrying of Generic Bearer ConnectionPackage the connects bag) bag allows IM-MGW monitor distant end media information, and notifies MGCF after monitoring distant end media information.User's face of IM-MGW requires to carry out the monitoring of RTP bag on the corresponding port, need to filter the information of no contents such as quiet frame, and the standard of detecting is the speech frame that monitors non-quiet frame, empty frame.
Generic?Bearer?Connection?Package
Package?Name：GB
Package?ID：0x0021
This bag of Description:This package provides the functionality to be able toestablish/modify/release a bearer connection. provides can set up/revise/discharge/monitor the carrying linkage function
Version：1
Extends：None
A.6.1 Properties
NA
A.6.2 Events
A.6.2.1?BNC?Change
Event?name：BNCChange
EventID：0x01
This incident of Description:This event occurs whenever a change to aBearer Network connection occurs.For example a bearer has beenestablished or a bearer has been modified. is used to characterize bearer network and connects the generation that changes, and for example is established or has been modified when carrying.
EventsDescriptor?Parameters：
Parameter?Name：Type
ParameterID：0x01
Type：Enumeration
Possible?values：
Est, incident is set up in [0x01] Bearer Established carrying
Mod, [0x02] Bearer Modified bearing modification incident
Cut, [0x03] Bearer Cut through carrying cut-out incident
Mfail, [0x04] Bearer Modification Failure bearing modification turkey
Used, [0x05] Bearer Used carrying monitoring incident
NOTE-For?release?indication?see：GeneralPackage?H.248?Section?E.1.2?Cause?Event.
Description:This is used to request the MG to notify itof a particularbearer event. is used for the bearing event that the MG notice produces
ObservedEventsDescriptor?Parameters：
Parameter?Name：Type
ParameterID：0x01
Type：Enumeration
Possible?values：
Est, [0x01] Bearer Established carries foundation
Mod, [0x02] Bearer Modified bearing modification
Cut, [0x03] Bearer Cut through carries cut-out
Mfail, the failure of [0x04] B earer Modification Failure bearing modification
Used, [0x05] Bearer Used carries monitoring
NOTE-For?release?indication，see?General?PackageH.248?Section?E.1.2?Cause?Event.
Description：This?is?used?to?indicate?what?change?has?occurred?tothe?BNC.
Fig. 4 switches schematic diagram according to the terminal above the IM-MGW of the embodiment of the invention, and the concrete steps of SDP media modification enforcement once are described below in conjunction with the Incoming signaling process of Fig. 4:
1-2) MGCF has received the INVITE of Incoming, comprises far-end SDP descriptor in the message, and the far-end SDP of this moment is designated remote sdp old, and MGCF sends 100Trying message, prevents the re-transmission of INVITE;
3-4) MGCF sends the carrying that the Add request message is set up the CS side to IM-MGW, has set up terminal T2 in context C1, and this terminal may also may be the RTP type for the TDM type, receives the Add response message, and terminal is set up successfully;
5-6) MGCF sends the carrying that the Add request message is set up the IMS side to IM-MGW, has set up terminal T1 in context C1, and this terminal is the RTP type, receives the Add response message, and terminal is set up successfully;
7-11) MGCF sends the SDP that 183 message comprise itself and describes, and the local terminal SDP of this moment is designated local sdp old.Receive PRACK message, send the 200OK response of PRACK, receive the Update request message, send the 200OK response message, related procedure is to finish the reliable transmission and the resource reservation flow process of Temporary Response;
12-14) MGCF sends 180 message after the ring of CS side, receives PRACK message, sends the 200OK response of PRACK, calls out and enters ringing condition;
15-18) 200 message of MGCF transmission INVITE behind the CS side answering call.Receive ACK message, call out and enter talking state;
19) MGCF receives the INVITE that the SDP medium switch, and comprises new SDP and describes, and the far-end SDP of this moment is designated remote sdp new;
20-21) MGCF sends the Add request message, receives the response message of Add.MGCF sets up RTP terminal T3 in context C1, specifying topological relation is the isolate state, and specifying in the Media Stream state of monitoring far-end SDP on this terminal, IM-MGW begins to notify user's face to monitor the medium stream information of far-end SDP address and port after setting up terminal;
22-23) MGCF sends 200OK message, carries the new SDP descriptor of local terminal, and the local terminal SDP of this moment is designated local sdp new.MGCF receives ACK message;
24-25) after monitoring the speech frame that has occurred non-quiet frame, empty frame on the remote sdp new, user's face of IM-MGW just notifies MGCF monitoring incident Bearer Used Ind.MGCF receives the Notify notification message, sends the Notify response message;
26-27) MGCF revises the topological relation of T1 and T3, and the T1 state is isolate, and the T3 state is sendrecv.MGCF sends the Modify request message, receives the response message of Modify; And
28-29) MGCF discharges terminal T1, and the position that T3 replaces T1 becomes local sdpold.MGCF sends the Subtract request message, receives the Subtract response message.
From above-mentioned flow process, as can be seen, take method of the present invention, can realize the modification of SDP medium flexibly, and can not produce losing of any media information.
Signaling process below in conjunction with Fig. 5 and Fig. 6 illustrates repeatedly the concrete steps (calling enters the preceding signaling process of talking state referring to the flow process of describing among Fig. 4) that the SDP media modification is implemented.
It is shown in Figure 5 monitoring out efficient media bag flow process before medium switch once more on new SDP port:
1) MGCF receives the INVITE that the SDP medium switch, and comprises new SDP and describes, and the far-end SDP of this moment is designated remote sdp new;
2-3) MGCF sends the Add request message, receives the response message of Add.MGCF sets up RTP terminal T3 in context C1, specifying topological relation is the isolate state, and specifying in the Media Stream state of monitoring far-end SDP on this terminal, IM-MGW begins to notify user's face to monitor the medium stream information of far-end SDP address and port after setting up terminal;
4-5) MGCF sends 200OK message, carries the new SDP descriptor of local terminal, and the local terminal SDP of this moment is designated local sdp new, and MGCF receives ACK message;
6-7) MGCF receives the Notify notification message, sends the Notify response message.After monitoring the speech frame that has occurred non-quiet frame, empty frame on the remote sdp new, user's face of IM-MGW just notifies MGCF monitoring incident Bearer Used Ind;
8-9) MGCF sends the Modify request message, receives the response message of Modify.MGCF revises the topological relation of T1 and T3, and the T1 state is isolate, and the T3 state is sendrecv;
10-11) MGCF sends the Sub request message, receives the Sub response message.MGCF discharges terminal T1;
12) MGCF receives the INVITE that the SDP medium switch once more, comprises new SDP and describes, and the far-end SDP of this moment is designated remote sdp new ';
13-14) MGCF sends the Add request message, receives the response message of Add.MGCF sets up RTP terminal T4 in context C1, specifying topological relation is the isolate state, and specifying in the Media Stream state of monitoring far-end SDP on this terminal, IM-MGW begins to notify user's face to monitor the medium stream information of far-end SDP address and port after setting up terminal;
15-16) MGCF sends 200OK message, carries the new SDP descriptor of local terminal, and the local terminal SDP of this moment is designated local sdp new ', and MGCF receives ACK message;
17-18) MGCF receives the Notify notification message, sends the Notify response message, just notifies MGCF monitoring incident Bearer Used Ind after user's face of IM-MGW monitors the speech frame that has occurred non-quiet frame, empty frame on the remote sdp new;
19-20) MGCF sends the Modify request message, receives the response message of Modify, and MGCF revises the topological relation of T3 and T4, and the T3 state is isolate, and the T4 state is sendrecv; And
21-22) MGCF sends the Subtract request message, receives the Subtract response message, and MGCF discharges terminal T3.
It is shown in Figure 6 not monitoring out efficient media bag flow process before medium switch once more on new SDP port:
1) MGCF receives the INVITE that the SDP medium switch, and comprises new SDP and describes, and the far-end SDP of this moment is designated remote sdp new;
2-3) MGCF sends the Add request message, receives the response message of Add.MGCF sets up RTP terminal T3 in context C1, specifying topological relation is the isolate state, and specifying in the Media Stream state of monitoring far-end SDP on this terminal, IM-MGW begins to notify user's face to monitor the medium stream information of far-end SDP address and port after setting up terminal;
4-5) MGCF sends 200OK message, carries the new SDP descriptor of local terminal, and the local terminal SDP of this moment is designated local sdp new, and MGCF receives ACK message;
6) MGCF receives the Notify notification message, sends the Notify response message.Before IM-MGW monitored the speech frame of non-quiet frame, empty frame from remote sdp new, MGCF had received the INVITE that revise the distant end media address once more, carried new SDP in the message and described, and the SDP of this moment describes and is designated remote sdp new ';
7-8) MGCF sends the Modify request message, receives the response message of Modify.MGCF revises the far-end attribute information of T3 terminal, and remote sdp new is updated to remote sdp new ', and remote sdp new is invalid;
9-10) MGCF sends 200OK message, carries the new SDP descriptor of local terminal, and the local terminal SDP sign of this moment is still local sdp new.MGCF receives ACK message; And
11-16) follow-up flow process is described with the 24-29 flow process of Fig. 4.
Thereby, can see that in the present invention, the main realization point of MGCF comprises:
One, receive the message of far-end SDP media modification after, on IM-MGW, set up new terminal and apply for new local terminal SDP, wherein, assigned I M-MGW needs open distal end Media Stream monitoring function when setting up new terminal, and the GB/BNCChange of agreement realizes by expanding H.248; And
Two, receive the relation of continuing of switching new SDP of local terminal and old SDP after the distant end media stream monitoring incident of IM-MGW report, and discharge the RTP port resource of old SDP correspondence.
In addition, the main realization point of IM-MGW comprises:
One, receive MGCF set up terminal request the time judge whether need be at user's face open distal end Media Stream monitoring function, the GB/BNCChange of agreement realizes by expanding H.248; And
Two, the user monitors in the face of the rtp streaming of particular port, filters the information of no contents such as quiet frame, then, monitoring is come out to notify MGCF behind the rtp streaming.
The repeatedly realization of medium switching, setting remote sdp old is original far-end address, local sdp old is original local terminal address, remote sdp new is the far-end address of switching for the first time, local sdp new is the local terminal address of switching for the first time, remote sdp new ' is the far-end address of switching once more, and local sdp new ' is the local terminal address of switching once more.
If monitor out efficient media stream at local sdp new, local sdpold is with invalid so, and local sdp new will substitute the position of local sdp old.Remote sdpnew ' substitutes the far-end address of position for needing to switch of remote sdp new, and receiving media stream is monitored Media Stream at local sdp new ' simultaneously on local sdpnew.Concrete message flow has been described among Fig. 4.
If do not monitor out efficient media stream as yet at local sdp new, so no longer apply for local sdp new ', continue to use local sdp new to monitor the efficient media that sends on the remote sdp new ' and flow.Remote sdp new address is with invalid.Receiving media stream on local sdp old continues to carry out the Media Stream monitoring simultaneously on local sdp new.Concrete message flow has been described among Fig. 5.
In sum, by method of the present invention, MGCF realizes this medium monitoring and switches and can be interrupted impression because the voice that the media modification of SDP causes switch to user's shielding by control IM-MGW, can avoid problem such as losing, improve user satisfaction greatly because medium switch the efficient media cause.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. method for amending conversation description protocol media is used for realizing it is characterized in that media modification to Session Description Protocol by media gateway controlling unit controls IP multimedia gateway, comprises following method:
Step 1, when the amending conversation description protocol media message of far-end was received in the media gateway controlling unit, the Session Description Protocol that sends new terminal to the IP multimedia gateway was set up request message and is applied for new local terminal Session Description Protocol;
Step 2, when described IP multimedia gateway received that the Session Description Protocol of described new terminal is set up request message, the user of described IP multimedia gateway determined whether that described new terminal is enabled media stream monitoring to be handled;
Step 3, when determining described new terminal enabled described media stream monitoring and handle, described user carries out the media stream monitoring processing to the RTP stream of described new terminal, and gives described media gateway controlling unit with the media stream monitoring message informing that monitoring obtains; And
Step 4, when receiving described media stream monitoring message, described IP multimedia gateway is carried out the medium hand-off process between the Session Description Protocol of the Session Description Protocol of described far-end and described new terminal, and discharges the real-time transmission protocol resource of the Session Description Protocol correspondence of described far-end.
2. method according to claim 1 is characterized in that, it is to realize by expansion GB/BNCChange H.248 that described media stream monitoring is handled.
3. method according to claim 1 is characterized in that, described media stream monitoring message is used to monitor the speech frame of non-quiet frame and non-NULL frame.
4. method according to claim 1 is characterized in that the amending conversation description protocol media message of described far-end comprises the descriptor of the Session Description Protocol of described far-end at least.
5. method according to claim 4 is characterized in that, handles below also carrying out in described step 1:
After described media gateway controlling unit received the amending conversation description protocol media message of described far-end, described media gateway controlling unit returned an acknowledge message, thus prevent described far-end amending conversation description protocol media message repeat transmit.
6. method according to claim 1 is characterized in that, described medium hand-off process comprises:
When described media gateway controlling unit monitors arrives the efficient real time host-host protocol stream of described new terminal, determine that former local terminal address is invalid;
Described media gateway controlling unit uses new local terminal address to replace described former local terminal address, uses the renewal far-end address to replace the far-end address that new far-end address is switched as needs; And
Receiving media stream on described new local terminal address, and to upgrading the processing of local terminal execution media stream monitoring.
7. method according to claim 1 is characterized in that, described medium hand-off process comprises:
When described media gateway controlling unit did not monitor the efficient real time host-host protocol stream of described new terminal, no longer local terminal was upgraded in application;
Use and newly originally bring in the efficient media stream that far-end is upgraded in monitoring, and confirm that new far-end address is invalid; And
Receiving media stream on former local terminal, and described new local terminal is carried out media stream monitoring handle.
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| CN1685691A (en) * | 2002-11-14 | 2005-10-19 | 西门子公司 | Support of fax and Modem in SIP/SIP-T network and in interworking between said network and ISUP+/BICC |
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| WO2007045526A1 (en) * | 2005-10-21 | 2007-04-26 | Siemens Aktiengesellschaft | Signalling for establishing an h.324 videotelefony connection between a media gateway and a controller |
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