CN102387124B - Method for modifying media literacy in SIP session and SIP truck gateway - Google Patents
Method for modifying media literacy in SIP session and SIP truck gateway Download PDFInfo
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- CN102387124B CN102387124B CN201010272352.4A CN201010272352A CN102387124B CN 102387124 B CN102387124 B CN 102387124B CN 201010272352 A CN201010272352 A CN 201010272352A CN 102387124 B CN102387124 B CN 102387124B
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Abstract
The invention discloses a method for modifying media literacy in a SIP session and a SIP truck gateway. The method comprises the steps of: receiving a message required for establishing a session or an establishment completing confirm message of the SIP session from a sender via the SIP truck gateway; sending a message required for media literacy to a target party; receiving and recording medial literacy collection of the target party returned by the target party; receiving medial literacy medication message without media literacy message from the target party by the SIP truck gateway; transforming the media literacy collection of the target party into the medial literacy medication message; and transmitting the media literacy modification message to the sender. In the method disclosed by the invention, the media literacy can be modified successfully by the medial literacy modification message without SDP medial literacy in the SIP session.
Description
Technical field
The present invention relates to Session initiation Protocol (SIP, Session Initiation Protocol) technical field, be specifically related to revise method and the SIP trunk gateway of media capability in SIP session.
Background technology
Along with supporting Session initiation Protocol (SIP in enterprise, Session Initiation Protocol) IP phone switch (IP-PBX, IP based Private Branch Exchange) a large amount of deployment and the (ITSP of Internet telephony operator that voice communication architecture is provided by Session Initiation Protocol, increasing gradually Internet Telephone Service Provider), enterprise is similar to traditional public switch telephone network (PSTN in the urgent need to a kind of can providing, Public Switched Telephone Network) between the SIP trunk technology Lai Shi IP-PBX of enterprise of trunk and outside ITSP, can carry out direct interconnection by this relaying.Enterprise's the whole network IPization no longer needs the PSTN network of disposing and upholding one's heritage, and all communication of going out of enterprise is all transferred to ITSP by this relaying.This relaying technique based on SIP is SIP Trunk.
SIP Trunk provides between a kind of virtual SIP trunk Lai Shi IP-PBX of enterprise that is similar to traditional PSTN relaying and outside ITSP and has carried out direct interconnection by IP.In this network architecture, all external calls of enterprise are all routed to ITSP by this SIP trunk and complete.Exterior I TSP provides service by the virtual trunk circuit of this SIP Trunk to enterprise.
Fig. 1 has provided the typical application scenarios figure of existing SIP Trunk, and as shown in Figure 1, wherein, SIP trunk gateway (TG, Trunk Gateway) is for the trunk gateway apparatus of enterprises communication and enterprise's PERCOM peripheral communication.It has the signaling relay forwarding of SIP2SIP of support and the Media Stream relay forwarding function of RTP (RTP, Real-time Transport Protocol) 2RTP.
Intermediate equipment as two networks, TG need to carry out address hiding each other to calling and called, therefore for the sip message of receiving, TG need to describe agreement (SDP by the meeting in the source address of sip message head and sip message, Session Description Protocol) source address of message body is all revised as the address of TG oneself, and then forwards this sip message.
In the process of establishing of the RTP passage of consulting based on SDP media capability collection, there is following several processing mode in TG:
1, transparent transmission mode
So-called transparent transmission mode, SDP message body in the sip message of sending for calling and called exactly, TG only revises the source address in SDP message body, do not revise the media capability information in SDP message body, do not participate in the SDP media capability negotiation of calling and called, but to calling and called transparent transmission entrained media capability information in SDP message body each other, by calling and called oneself, carry out media capability negotiation.For the RTP message of receiving from calling and called, TG only forwards to opposite end.
2, translative mode
So-called translative mode, the sip message of sending for calling and called exactly, TG not only revises the source address in SDP message body, but also can be according to user's setting, the sip message of receiving and SDP media capability information are wherein reorganized to the new message of rear generation, then to opposite end, send.Compare with transparent transmission mode, its benefit is to manage and to filter control to the media capability of media capability negotiation opportunity and employing.
After SIP session establishment, session one end may require the media capability of current use to modify, and now, can send to opposite end and heavily invite (ReInvite) message, and this message may be carried SDP message body, also may not carry SDP message body.But, in order to guarantee, call out and charging safety at present, most of ITSP servers do not allow to send and with the ReInvite message of SDP media capability information, the media capability of current use is not modified in the SIP session of having set up, in this case, TG adopts translative mode conventionally, to carry out adaptation processing after receiving the ReInvite message of not carrying SDP message body.
Owing to adopting translative mode to carry out in the process of SDP media capability negotiation, TG controls respectively the media capability negotiation with calling and called, can exist three not exist media capability to occur simultaneously and cause calling out situation about cannot set up; In addition, TG carries out SDP media capability negotiation with calling and called respectively, in this process, the media capability that TG and calling and called are consulted out also may be inconsistent, now also need TG to carry out to the other end, sending again encoding and decoding conversion to the dissimilar RTP message of receiving from one end, TG also needs to support the transfer capability of isomery encoding and decoding message like this, and device hardware is had relatively high expectations, and call features is also had to impact.
Summary of the invention
The invention provides method and the SIP trunk gateway of in SIP session, revising media capability, to guarantee can successfully revising media capability by not carrying the media capability modification message of SDP media capability in SIP session.
Technical scheme of the present invention is achieved in that
A kind of method of revising media capability in Session initiation Protocol SIP session, be applied to have the enterprise network of the IP phone switch IP-PBX that supports SIP and provide in the internetwork SIP session of the ITSP of internet service provider of voice communication architecture by SIP, the method comprises:
SIP trunk gateway receives the SIP session establishment request message of originating side sent, to target side, sends media capability request message, receives the media capability collection of the target side that also record object side returns; Or the SIP session establishment that SIP trunk gateway receives originating side sent completes acknowledge message, to target side, send media capability request message, receive the media capability collection of the target side that also record object side returns;
What SIP trunk gateway receiving target side sent does not revise message with the media capability of media capability information, the media capability collection of the target side of record is put into described media capability and revise message, this media capability is revised to message and be transmitted to initiator, and the response message that carries media capability of initiator's transmission is transmitted to target side, the media capability carrying in the response message that wherein initiator sends is to concentrate from the media capability of target side one or more media capability of selecting.
Described media capability request message is SIP option message.
Described SIP trunk gateway receiving target side sends does not revise message with the media capability of media capability information and is:
SIP trunk gateway receiving target side send not with the heavy invitation message of the SIP of Session Description Protocol SDP message body.
The SIP session establishment request message that described SIP trunk gateway receives originating side sent is:
SIP trunk gateway receives the sip invite message of originating side sent.
The SIP session establishment of described SIP trunk gateway reception originating side sent completes acknowledge message and is:
The SIP acknowledge message that the indication SIP session establishment of SIP trunk gateway reception originating side sent completes.
A SIP trunk gateway, comprising:
Media capability request module: receive the SIP session establishment request message of originating side sent, send media capability request message to target side, receive the media capability collection of the target side that also record object side returns;
Media capability is revised processing module: what receiving target side sent does not revise message with the media capability of media capability information, the media capability collection of the target side of media capability request module record is put into described media capability and revise message, this media capability is revised to message and be transmitted to initiator.
Described media capability request message is SIP option message.
Describedly with the media capability of media capability information, do not revise message and be: with the heavy invitation message of SIP of Session Description Protocol SDP message body.
Described SIP session establishment request message is: sip invite message.
A SIP trunk gateway, comprising:
Media capability request module: the SIP session establishment that receives originating side sent completes acknowledge message, sends media capability request message to target side, receives the media capability collection of the target side that also record object side returns;
Media capability is revised processing module: what receiving target side sent does not revise message with the media capability of media capability information, the media capability collection of the target side of media capability request module record is put into described media capability and revise message, this media capability is revised to message and be transmitted to initiator.
Described media capability request message is SIP option message.
Describedly with the media capability of media capability information, do not revise message and be: with the heavy invitation message of SIP of Session Description Protocol SDP message body.
Described SIP session establishment completes acknowledge message: the SIP acknowledge message that indication SIP session establishment completes.
Compared with prior art, in the present invention, the SIP session establishment request message or the SIP session establishment that when SIP trunk gateway, receive originating side sent complete acknowledge message, to target side, obtain the media capability collection of target side, after this, when SIP trunk gateway receive that target side sends with the media capability of media capability information, do not revise message time, the media capability collection of target side is put into described media capability and revise message, thereby avoided not sending and revising message with the media capability of media capability information to ITSP network, make initiator can obtain the media capability collection of target side simultaneously, having guaranteed that media capability is successfully modified completes.
Accompanying drawing explanation
Fig. 1 is the typical application scenarios figure of existing SIP Trunk;
Fig. 2 revises the method flow diagram of media capability for what the embodiment of the present invention one provided in SIP session;
Fig. 3 revises the method flow diagram of media capability for what the embodiment of the present invention two provided in SIP session;
The composition schematic diagram of the SIP trunk gateway that Fig. 4 provides for the embodiment of the present invention one.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
Fig. 2 revises the method flow diagram of media capability for what the embodiment of the present invention one provided in SIP session, and as shown in Figure 2, its concrete steps are as follows:
Step 201: initiator sends SIP to SIP trunk gateway (TG) and invites (Invite) message, carries initiator's media capability that initiator provides in the SDP message body of this message.
Initiator may be the terminal having in the enterprise network of the IP-PBX that supports SIP, or the terminal in the ITSP net of voice communication architecture is provided by SIP; Target side may be to provide the terminal in the ITSP net of voice communication architecture by Session Initiation Protocol, or has the terminal in the enterprise network of the IP-PBX that supports SIP.
Step 202:TG receives SIP Invite message, according to the target side address in message, sends SIP option (OPTIONS) message, with the media capability collection of acquisition request target side to target side.
The SIP OPTIONS message here can be used the SIPOPTIONS message proposing in SIP basic agreement RFC3261.
Step 203: target side receives SIP OPTIONS message, returns to SIP 200 response (Ok) message to TG, carries the media capability collection of target side in the SDP message body of this message.
Step 204:TG receives SIP 200Ok message, obtains the media capability collection of target side from the SDP message body of this message.
Step 205:TG is transmitted to target side by SIP Invite message.
Step 206: target side receives SIP Invite message, returns to SIP 180 rings (Ringing) message by TG to initiator; Simultaneously, the initiator's media capability carrying in SIP Invite message is concentrated the media capability of selecting one or more target side to support, the media capability that the media capability of selection is replied as this target side is put into SIP 200Ok message, and SIP 200Ok message is returned to initiator by TG.
Step 207: initiator receives SIP 200Ok message, records the media capability that target side that this message carries is replied, and returns to SIP confirm (Ack) message by TG to target side.
After this, initiator and target side adopt the media capability media stream in the SIP 200Ok message in step 206.
Step 208: target side will be revised the media capability of current use, sends SIP ReInvite message to initiator, and this message is not carried SDP message body.
Step 209:TG receives SIP ReInvite message, find that this message do not carry SDP message body, media capability structure SDP message body the media capability collection of the target side of obtaining in step 204 being provided as target side, this SDP message body is put into SIP ReInvite message, SIP ReInvite message is transmitted to initiator.
Step 210: initiator receives SIP ReInvite message, from the media capability of SDP message body, concentrate the media capability of selecting one or more initiators to support, the media capability that the media capability of selection is replied as this initiator is put into SDP message body of SIP 200 Ok message, and SIP 200 Ok message are sent to TG.
Step 211:TG receives SIP 200 Ok message, and the media capability that the media capability in SDP message body is provided as initiator, is transmitted to target side by SIP 200 Ok message.
Step 212: target side receives SIP 200 Ok message, record the media capability in sip message body, the media capability of simultaneously media capability in the SDP message body of SIP 200 Ok message being replied as this target side is put into SDP message body of SIP Ack message, to TG, returns to this SIP Ack message.
After this, target side and initiator use the media capability media stream in the SIP 200 Ok message in step 212.
Step 213:TG receives SIP Ack message, to initiator, forwards SIP Ack message.
The SIP Ack message that TG forwards to initiator can not carried SDP message body.
Fig. 3 revises the flow chart of media capability for what the embodiment of the present invention two provided in SIP session, and as shown in Figure 3, its concrete steps are as follows:
Step 301: initiator sends SIP Invite message to TG, carries initiator's media capability collection that initiator provides in the SDP message body of this message.
Initiator may be the terminal having in the enterprise network of the IP-PBX that supports SIP, or the terminal in the ITSP net of voice communication architecture is provided by SIP; Target side may be to provide the terminal in the ITSP net of voice communication architecture by Session Initiation Protocol, or has the terminal in the enterprise network of the IP-PBX that supports SIP.
Step 302:TG receives SIP Invite message, and SIP Invite message is transmitted to target side.
Step 303: target side receives SIP Invite message, returns to SIP 180Ringing message by TG to initiator; Simultaneously, the initiator's media capability carrying in SIP Invite message is concentrated the media capability of selecting one or more target side to support, the media capability that this media capability is replied as this target side is put into SIP 200 Ok message, and SIP 200 Ok message are returned to initiator by TG.
Step 304: initiator receives SIP 200 Ok message, records the media capability that target side that this message carries is replied, and to TG, returns to SIP Ack message.
Step 305:TG receives SIP Ack message, and this SIP Ack message is transmitted to target side, meanwhile, according to the target side address in SIP Ack message, sends SIP OPTIONS message, with the media capability collection of acquisition request target side to target side.
After this, initiator and target side adopt the media capability media stream in the SIP 200 Ok message in step 303.
Step 306: target side receives SIP OPTIONS message, returns to SIP 200 Ok message to TG, carries the media capability collection of target side in the SDP message body of this message.
Step 307:TG receives SIP 200 Ok message, obtains the media capability collection of target side from the SDP message body of this message.
Step 308: target side will be revised the media capability of current use, sends SIP ReInvite message to initiator, and this message is not carried SDP message body.
Step 309:TG receives SIP ReInvite message, find that this message do not carry SDP message body, media capability structure SDP message body the media capability collection of the target side of obtaining in step 307 being provided as target side, this SDP message body is put into SIP ReInvite message, SIP ReInvite message is transmitted to initiator.
Step 310: initiator receives ReInvite message, from the media capability of SDP message body, concentrate the media capability of selecting one or more initiators to support, the media capability that this media capability is replied as this initiator is put into SDP message body of SIP 200 Ok message, and SIP 200 Ok message are sent to TG.
Step 311:TG receives SIP 200 Ok message, and the media capability that the media capability in SDP message body is provided as initiator, is transmitted to target side by SIP 200 Ok message.
Step 312: target side receives SIP 200 Ok message, record the media capability in sip message body, the media capability of simultaneously media capability in the SDP message body of SIP 200 Ok message being replied as this target side is put into SDP message body of SIP Ack message, to TG, returns to this SIP Ack message.
After this, target side and initiator use the media capability media stream in the SIP 200 Ok message in step 311.
Step 313:TG receives SIP Ack message, to initiator, forwards SIP Ack message.
The SIP Ack message that TG forwards to initiator can not carried SDP message body.
The composition schematic diagram of the SIP trunk gateway that Fig. 4 provides for the embodiment of the present invention one, as shown in Figure 4, it mainly comprises: media capability request module 41 and media capability are revised processing module 42, wherein:
Media capability request module 41: the SIP Invite message that receives originating side sent, to target side, send SIP OPTIONS message, the SIP 200 Ok message that receiving target side returns are obtained the also media capability collection of record object side from the SDP message body of SIP 200 Ok message.
Media capability is revised processing module 42: receiving target side send not with the SIPReInvite message of SDP message body, utilize media capability collection structure SDP message body of the target side of media capability request module 41 records, this SDP message body is put into SIP ReInvite message, SIP ReInvite message is transmitted to initiator.
The composition schematic diagram that below provides the SIP trunk gateway that the embodiment of the present invention two provides, it mainly comprises: media capability request module and media capability are revised processing module, wherein:
Media capability request module: the SIP Ack message that the indication SIP session establishment of reception originating side sent completes, to target side, send SIP OPTIONS message, the SIP 200 Ok message that receiving target side returns are obtained the also media capability collection of record object side from the SDP message body of these SIP 200 Ok message.
Media capability is revised processing module: receiving target side send not with the SIP ReInvite message of SDP message body, utilize media capability collection structure SDP message body of the target side of media capability request module record, this SDP message body is put into SIP ReInvite message, SIP ReInvite message is transmitted to initiator.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (13)
1. a method of revising media capability in Session initiation Protocol SIP session, be applied to there is the enterprise network of the IP phone switch IP-PBX that supports SIP and provide in the internetwork SIP session of the ITSP of internet service provider of voice communication architecture by SIP, it is characterized in that, the method comprises:
SIP trunk gateway receives the SIP session establishment request message of originating side sent, to target side, sends media capability request message, receives the media capability collection of the target side that also record object side returns; Or the SIP session establishment that SIP trunk gateway receives originating side sent completes acknowledge message, to target side, send media capability request message, receive the media capability collection of the target side that also record object side returns;
What SIP trunk gateway receiving target side sent does not revise message with the media capability of media capability information, the media capability collection of the target side of record is put into described media capability and revise message, this media capability is revised to message and be transmitted to initiator, and the response message that carries media capability of initiator's transmission is transmitted to target side, the media capability carrying in the response message that wherein initiator sends is to concentrate from the media capability of target side one or more media capability of selecting.
2. method according to claim 1, is characterized in that, described media capability request message is SIP option message.
3. method according to claim 1, is characterized in that, described SIP trunk gateway receiving target side sends does not revise message with the media capability of media capability information and be:
SIP trunk gateway receiving target side send not with the heavy invitation message of the SIP of Session Description Protocol SDP message body.
4. method according to claim 1, is characterized in that, the SIP session establishment request message that described SIP trunk gateway receives originating side sent is:
SIP trunk gateway receives the sip invite message of originating side sent.
5. method according to claim 1, is characterized in that, the SIP session establishment of described SIP trunk gateway reception originating side sent completes acknowledge message and is:
The SIP acknowledge message that the indication SIP session establishment of SIP trunk gateway reception originating side sent completes.
6. a SIP trunk gateway, is characterized in that, comprising:
Media capability request module: receive the SIP session establishment request message of originating side sent, send media capability request message to target side, receive the media capability collection of the target side that also record object side returns;
Media capability is revised processing module: what receiving target side sent does not revise message with the media capability of media capability information, the media capability collection of the target side of media capability request module record is put into described media capability and revise message, this media capability is revised to message and be transmitted to initiator, described initiator is the terminal having in the enterprise network of the IP-PBX that supports SIP, described target side is for providing the terminal in the ITSP net of voice communication architecture by SIP, or, described initiator is for providing the terminal in the ITSP net of voice communication architecture by SIP, described target side is the terminal having in the enterprise network of the IP-PBX that supports SIP.
7. SIP trunk gateway according to claim 6, is characterized in that, described media capability request message is SIP option message.
8. SIP trunk gateway according to claim 6, is characterized in that, describedly with the media capability of media capability information, does not revise message and is: with the heavy invitation message of SIP of Session Description Protocol SDP message body.
9. SIP trunk gateway according to claim 6, is characterized in that, described SIP session establishment request message is: sip invite message.
10. a SIP trunk gateway, is characterized in that, comprising:
Media capability request module: the SIP session establishment that receives originating side sent completes acknowledge message, sends media capability request message to target side, receives the media capability collection of the target side that also record object side returns;
Media capability is revised processing module: what receiving target side sent does not revise message with the media capability of media capability information, the media capability collection of the target side of media capability request module record is put into described media capability and revise message, this media capability is revised to message and be transmitted to initiator, described initiator is the terminal having in the enterprise network of the IP-PBX that supports SIP, described target side is for providing the terminal in the ITSP net of voice communication architecture by SIP, or, described initiator is for providing the terminal in the ITSP net of voice communication architecture by SIP, described target side is the terminal having in the enterprise network of the IP-PBX that supports SIP.
11. SIP trunk gateways according to claim 10, is characterized in that, described media capability request message is SIP option message.
12. SIP trunk gateways according to claim 10, is characterized in that, describedly with the media capability of media capability information, do not revise message and are: with the heavy invitation message of SIP of Session Description Protocol SDP message body.
13. SIP trunk gateways according to claim 10, is characterized in that, described SIP session establishment completes acknowledge message and is: the SIP acknowledge message that indication SIP session establishment completes.
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| JP4762181B2 (en) * | 2007-03-19 | 2011-08-31 | 株式会社東芝 | SIP trunk gateway device and method for controlling SIP trunk gateway device |
| JP5071158B2 (en) * | 2008-02-29 | 2012-11-14 | 沖電気工業株式会社 | Exchange system and server device |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |