CN101123593B - Method for streaming implementation in media gateway control - Google Patents
Method for streaming implementation in media gateway control Download PDFInfo
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- CN101123593B CN101123593B CN2007101518291A CN200710151829A CN101123593B CN 101123593 B CN101123593 B CN 101123593B CN 2007101518291 A CN2007101518291 A CN 2007101518291A CN 200710151829 A CN200710151829 A CN 200710151829A CN 101123593 B CN101123593 B CN 101123593B
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Abstract
The invention discloses an early media function realization method through a media gateway control function. When the media gateway control function is used for calling to realize the early media function., the method comprises that the media gateway control function sets up two terminals, which are an early conversation terminal and a conversation terminal, in a same context of an IP multimedia gateway; and the effective states of the two terminals are controlled according to a predetermined topological structure, the early conversation terminal is set as an effective state before making a calling conversation state, the conversation terminal is set as an effective state after making a calling conversation state and the early conversation terminal is deleted at the same time. The invention controls the IP multimedia gateway through the media gateway control function to set up two terminals, so as to reach a purpose of making a media negotiation on the early conversation and the conversation respectively.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of MGCF and realize the method for media function early.
Background technology
Early Media (medium early) is meant the medium before called subscriber answer is called out, and uses early media to carry called subscriber's ring-back tone or failure sound.
In the RFC3690 agreement, for morning medium two kinds of implementation: Gateway (gateway) patterns and Application Server (application server) pattern are arranged.
The Gateway pattern is to finish the mutual of earlymedia by set up early session (session early) before final response.Generally finish the offer and the answer of medium by interim reliable response, PRACK (Temporary Response) and UPDATE (renewal).
Application Server pattern is the early session (session early) that separates with session (session) by setting up between UAS (subscriber proxy server) and the UAC (user agent client), carries out media negotiation respectively for early session and session.
Media function morning under MGCF (MGCF) the needs realization gateway mode has only been described, without any the media function of realizing about MGCF under application server pattern morning in the existing protocol standard.But the recommendation pattern of IETF (internet engineering task group) agreement is the application server pattern, this pattern can well be avoided the generation of Media clipping, Media clipping is meant that the user thinks that media session sets up, the user loquiturs, but actual conversation procedure is not also finished, and more incipient voice may be lost.
Summary of the invention
The invention provides a kind of MGCF and realize the method for media function early, only described MGCF in the existing protocol standard and need realize media function morning gateway mode under in order to solve, without any about under the MGCF realization application server pattern morning media function problem.
The invention provides a kind of MGCF and realize the method for media function early, call out at MGCF, when needing realization media function morning, described method comprises:
Steps A: when the MGCF outbound call, MGCF is set up the calling of circuit-switched side to the IP Multimedia System side, and sets up the terminal of circuit-switched side in context; MGCF is set up the conversational terminal of IP Multimedia System side in described context; MGCF initiates to invite to IP Multimedia System, indicates the support media function, carries the Session Description Protocol request of session simultaneously; IP Multimedia System response MGCF indicates current calling and uses media function early, and carries the Session Description Protocol request of session early and the Session Description Protocol response of session; MGCF is set up conversational terminal morning of IP Multimedia System side in described context, early conversational terminal is set to effective status simultaneously, and conversational terminal is set to isolated state;
When the MGCF incoming call, MGCF is set up the calling of IP Multimedia System side to circuit-switched side; IP Multimedia System initiates to invite to MGCF, indicates and supports session early, carries the Session Description Protocol request of session simultaneously; MGCF is set up the terminal of circuit-switched side in context; MGCF is set up conversational terminal morning of IP Multimedia System side in described context, and the topological relation that described morning of conversational terminal is set is an effective status; MGCF is set up the conversational terminal of IP Multimedia System side in described context, and the topological relation that described conversational terminal is set is an isolated state.
Step B: after calling entered talking state, conversational terminal was set to effective status, and deletion simultaneously is conversational terminal early.
Further, described step B specifically comprises:
After calling entered ringing condition, MGCF sent the request of modification to IP Multimedia System, and after the modification response of receiving IP Multimedia System, early conversational terminal is set to isolated state, and conversational terminal is set to effective status;
MGCF is to IP Multimedia System request deletion conversational terminal morning, and after the deletion response of receiving IP Multimedia System, release is conversational terminal early, calls out to enter talking state.
Further, the conversational terminal of described IP Multimedia System side is the RTP type.When the ISUP signaling was used in circuit switching, the terminal of described circuit-switched side was the time division multiplexing type; When the call control signalling of circuit switching use and bearer independent, the terminal of described circuit-switched side is the RTP type.
In sum, the invention provides a kind of MGCF and realize the method for media function early, realize that for MGCF media function morning under the application server pattern is described, promptly set up two terminals, be able to early session and session are carried out respectively the purpose of media negotiation by MGCF control IM-MGW.
Description of drawings
Fig. 1 is the schematic flow sheet of the described method of the embodiment of the invention;
Fig. 2 is the topological structure schematic diagram of the terminal in IM-MGW;
Fig. 3 is another topological structure schematic diagram of the terminal in IM-MGW;
Fig. 4 realizes the schematic flow sheet of media function early for the MGCF outbound call;
Fig. 5 realizes the schematic flow sheet of media function early for the MGCF incoming call.
Embodiment
Below in conjunction with accompanying drawing the described method of the embodiment of the invention is elaborated.
As shown in Figure 1, Fig. 1 is the schematic flow sheet of the described method of the embodiment of the invention, specifically may further comprise the steps:
Step 101: when determine to need realizing early media function, set up two terminals in the same context of MGCF (MGCF) on IM-MGW (IP multimedia gateway): early conversational terminal and conversational terminal;
Step 102: control the effective status of described two terminals according to predetermined topological structure, before talking state was carried out in calling, being provided with early, conversational terminal was an effective status;
Step 103: after talking state was carried out in calling, MGCF control IP multimedia gateway conversational terminal was set to effective status, and deletion simultaneously is conversational terminal early.
Wherein, terminal topology structure in IM-MGW as shown in Figures 2 and 3, T0 is the terminal of CS side, T1 is the early session terminal of IMS side, T2 is the session terminal of IMS side, described topological structure comprises: among Fig. 2, come into force the period for early session terminal during ring-back tone, T0 and T1 are diconnected; Among Fig. 3, early session is invalid during the conversation, and session comes into force the period, and T0 and T2 are diconnected, and the T1 terminal is released.
For example the described method of the embodiment of the invention is further specified below.
As shown in Figure 4, Fig. 4 is to be that example illustrates that the MGCF outbound call realizes the schematic flow sheet of media function early with the out signaling process of IMS (IP Multimedia System), specifically may further comprise the steps:
Step 401:MGCF receives IAM (initial address) message of CS (circuit switching) side Incoming, is established to the calling of IMS side.
Step 402-403:MGCF sends the carrying that the Add request message is set up the CS side to IM-MGW (IP multimedia gateway), has set up the terminal of CS side in context C1, and MGCF receives the Add response message that IM-MGW sends, and the terminal of CS side is set up successfully.When ISUP (ISUP) signaling was used in circuit switching, the terminal of described circuit-switched side was TDM (time division multiplexing) type; When BICC (with the calling control of bearer independent) signaling was used in circuit switching, the terminal of described circuit-switched side was RTP (RTP) type.
Step 404-405:MGCF sends the carrying that the Add request message is set up the IMS side to IM-MGW, has set up the session terminal of IMS side in context C1, and the session terminal of described IMS side is the RTP type; MGCF receives the Add response message that IM-MGW sends, and the session terminal of IMS side is set up successfully.
Step 406:MGCF sends INVITE (invitation) message, indicates in the support field in INVITE to support media function early, carries SDP (Session Description Protocol) offer (request) of session simultaneously.
Step 407-408:MGCF receives the 100Trying and the 183session progress message of IMS side.100Trying message is the response that prevents that INVITE from retransmitting; Indicate current calling in 183 message and used media function early, and carry the SDP offer of early session and the SDP answer (response) of session.
Step 409-410:MGCF sends the Add request message to IM-MGW, in context C1, set up the early session terminal of IMS side, simultaneously the topological relation of the session terminal of IMS side is modified as isolated state, the early session terminal of IMS side is the diconnected state; MGCF receives the Add response message that IM-MGW sends, and the early session terminal of IMS side is set up successfully.
Step 411-412:MGCF sends PRACK (Temporary Response) message to IMS, carries the SDP answer of early session in the described PRACK message; IMS sends the 200 OK message of PRACK to MGCF.
Step 413-415:MGCF receives the COT (conducting message) of CS side, sends Update message to the IMS side, and receives the 200 OK response of the Update of IMS side.
Step 416-419:IMS side user ring after MGCF receives 180 Ringing message, sends PRACK message to IMS, sends to the ACM (Address Complete Message) of CS side, receives the 200 OK response messages of PRACK.Calling enters ringing condition.
The user answer of step 420:IMS side, MGCF receives the 200 OK message of INVITE.
Step 421-422:MGCF sends Modify (modification) request message, receives the Modify response message.Change the topological relation of early session and session terminal, the early session terminal of IMS side is an isolated state, and the session terminal of IMS side is an effective status, i.e. the diconnected state.
Step 423-424:MGCF sends Subtract (deletion) request message, receives the Subtract response message.MGCF discharges the early session terminal of IMS side.Early session flow process finishes.
Step 425:MGCF sends ANM (response message) and gives CS.
Step 426:MGCF sends ACK (affirmation) message of INVITE, calls out to enter talking state.
As shown in Figure 5, Fig. 5 is to be that example illustrates that the MGCF incoming call realizes the schematic flow sheet of media function early, specifically may further comprise the steps with the out signaling process of IMS (IP Multimedia System):
Step 501-502:MGCF has received the INVITE of IMS side Incoming, is established to the calling of CS side.Support field in the INVITE breath indicates supports media function early, carries the SDP request of session simultaneously.MGCF response 100Trying response prevents that INVITE from retransmitting.
Step 503-504:MGCF sends the carrying that the Add request message is set up the CS side to IM-MGW, has set up the terminal of CS side in context C1.MGCF receives the Add response message that IM-MGW sends, and the terminal of CS side is set up successfully.When ISUP (ISUP) signaling was used in circuit switching, the terminal of described circuit-switched side was TDM (time division multiplexing) type; When BICC (with the calling control of bearer independent) signaling was used in circuit switching, the terminal of described circuit-switched side was RTP (RTP) type.
Step 505-506:MGCF sends the carrying that the Add request message is set up the IMS side to IM-MGW, has set up the terminal of the early session of IMS side in context C1, and the early session terminal of described IMS side is the RTP type.Topological relation is the diconnected state.MGCf receives the Add response message that IM-MGW sends, and the early session terminal of IMS side is set up successfully.
Step 507-508:MGCF sends the carrying that the Add request message is set up the IMS side to IM-MGW, has set up the session terminal of IMS side in context C1, and the session terminal of described IMS side is the RTP type.Topological relation is an isolated state.MGCF receives the Add response message that IM-MGW sends, and the session terminal of CS side is set up successfully.
Step 509:MGCF sends IAM message, is established to the calling of CS side.
Step 510:MGCF sends 183 session progress message, indicates current calling in the message and uses early session function, and carry the SDP offer of early session and the SDP answer of session.
Carry the answer of early session in the PRACK message of step 511-512:183.Send the 200 OK message of PRACK.
Step 513-515:MGCF receives the Update message of IMS side, sends the 200 OK response of Update, sends the COT of CS side.
Step 516-519:CS side user ring, MGCF receives the ACM message of CS side, sends 180 Ringing message then, and receives that the PRACK message that IMS sends, MGCF send the 200 OK response of PRACK.Calling enters ringing condition.
The user answer of step 520:CS side, MGCF receives the ANM that CS sends.
Step 521-522:MGCF sends the Modify request message, and receives the Modify response message that IM-MGW sends.Change the topological relation of early session and session terminal, early session terminal is isolated state e, and the session terminal is an effective status, i.e. the diconnected state.
Step 523-524:MGCF sends the Subtract request message, and receives the Subtract response message that IM-MGW sends.MGCF discharges early session terminal.Early session flow process finishes.
Step 525-526:MGCF sends the 200 OK message of INVITE, receives ACK message, calls out to enter talking state.
Here, only to use the ISUP signaling as example the described method of the embodiment of the invention to be illustrated, be equally applicable to use the condition of asking of BICC information but those of ordinary skills should be understood that the embodiment of the invention, detailed process is approximate, just repeats no more herein.
In sum, the embodiment of the invention provides a kind of MGCF to realize the method for media function early, and IM-MGW sets up two terminals by MGCF control, is able to early session and session are carried out respectively the purpose of media negotiation.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (4)
1. a MGCF is realized the method for media function early, it is characterized in that, calls out at MGCF, and when needing realization media function morning, described method comprises:
Steps A: when the MGCF outbound call, MGCF is set up the calling of circuit-switched side to the IP Multimedia System side, and sets up the terminal of circuit-switched side in context; MGCF is set up the conversational terminal of IP Multimedia System side in described context; MGCF initiates to invite to IP Multimedia System, indicates the support media function, carries the Session Description Protocol request of session simultaneously; IP Multimedia System response MGCF indicates current calling and uses media function early, and carries the Session Description Protocol request of session early and the Session Description Protocol response of session; MGCF is set up conversational terminal morning of IP Multimedia System side in described context, early conversational terminal is set to effective status simultaneously, and conversational terminal is set to isolated state;
When the MGCF incoming call, MGCF is set up the calling of IP Multimedia System side to circuit-switched side; IP Multimedia System initiates to invite to MGCF, indicates and supports session early, carries the Session Description Protocol request of session simultaneously; MGCF is set up the terminal of circuit-switched side in context; MGCF is set up conversational terminal morning of IP Multimedia System side in described context, and the topological relation that described morning of conversational terminal is set is an effective status; MGCF is set up the conversational terminal of IP Multimedia System side in described context, and the topological relation that described conversational terminal is set is an isolated state;
Step B: after calling entered talking state, conversational terminal was set to effective status, and deletion simultaneously is conversational terminal early.
2. method according to claim 1 is characterized in that, described step B specifically comprises:
After calling entered ringing condition, MGCF sent the request of modification to IP Multimedia System, and after the modification response of receiving IP Multimedia System, early conversational terminal is set to isolated state, and conversational terminal is set to effective status;
MGCF is to IP Multimedia System request deletion conversational terminal morning, and after the deletion response of receiving IP Multimedia System, release is conversational terminal early, calls out to enter talking state.
3. method according to claim 1 and 2 is characterized in that, the conversational terminal of described IP Multimedia System side is the RTP type.
4. method according to claim 1 and 2 is characterized in that, when the ISUP signaling was used in circuit switching, the terminal of described circuit-switched side was the time division multiplexing type; When the call control signalling of circuit switching use and bearer independent, the terminal of described circuit-switched side is the RTP type.
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| CN101448203B (en) * | 2008-04-11 | 2010-12-08 | 中兴通讯股份有限公司 | Implement method for controlling early-media playing |
| CN107251512B (en) * | 2015-01-21 | 2021-03-23 | 瑞典爱立信有限公司 | Method, device and system for establishing a secure communication session |
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Patent Citations (5)
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| CN1501650A (en) * | 2002-11-14 | 2004-06-02 | 华为技术有限公司 | A call flow setting up method |
| CN1868196A (en) * | 2003-10-16 | 2006-11-22 | 西门子公司 | Handling of early media data I |
| CN1868195A (en) * | 2003-10-16 | 2006-11-22 | 西门子公司 | Treatment of early media II |
| CN1996999A (en) * | 2005-12-31 | 2007-07-11 | 华为技术有限公司 | A media resource reservation method and device |
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