CN102387124A - 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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- CN102387124A CN102387124A CN2010102723524A CN201010272352A CN102387124A CN 102387124 A CN102387124 A CN 102387124A CN 2010102723524 A CN2010102723524 A CN 2010102723524A CN 201010272352 A CN201010272352 A CN 201010272352A CN 102387124 A CN102387124 A CN 102387124A
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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 in the SIP session, revise the method and the SIP trunk gateway of media capability.
Background technology
Along with supporting Session initiation Protocol (SIP in the enterprise; Session Initiation Protocol) IP phone switch (IP-PBX; IP based Private Branch Exchange) a large amount of deployment and the (ITSP of IP operator that the voice communication architecture is provided through Session Initiation Protocol; Increasing gradually Internet Telephone Service Provider); Enterprise presses between a kind of ITSP that can provide the SIP trunk technology that is similar to traditional public switch telephone network (PSTN, Public Switched Telephone Network) trunk to make IP-PBX of enterprise and outside can carry out direct interconnection through this relaying.The PSTN network that enterprise's the whole network IPization no longer need be disposed and uphold one's heritage, all communications of going out of enterprise are all transferred to ITSP through this relaying.This relaying technique based on SIP is SIP Trunk.
Carry out direct interconnection through IP between the ITSP that SIP Trunk provides a kind of virtual SIP trunk that is similar to the traditional PSTN relaying to make IP-PBX of enterprise and outside.In this network architecture, all external calls of enterprise all are routed to ITSP through this SIP trunk and accomplish.Exterior I TSP provides service through the virtual trunk circuit of this SIP Trunk to enterprise.
Fig. 1 has provided the typical application scene graph of existing SIP Trunk, and is as shown in Figure 1, and wherein, SIP trunk gateway (TG, Trunk Gateway) promptly is used for the Tandem Gateway equipment that enterprises communication is communicated by letter with exterior of enterprise.It has, and the signaling relaying of supporting SIP2SIP is transmitted and the Media Stream relaying forwarding capability of RTP (RTP, Real-time Transport Protocol) 2RTP.
Intermediate equipment as two networks; TG need carry out address hiding each other to calling and called; So for the sip message of receiving; TG need describe agreement (SDP, the Session Description Protocol) source address of message body with the source address of sip message head and the meeting in the sip message and be revised as the address of TG oneself, and then transmit this sip message.
Setting up on the process of the RTP passage of consulting based on SDP media capability collection, there are following several kinds of processing modes 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 the SDP message body, does not revise the media capability information in the SDP message body, does not promptly participate in the SDP media capability negotiation of calling and called; But, carry out media capability negotiation by calling and called oneself to calling and called transparent transmission entrained media capability information in SDP message body each other.For the RTP message of receiving from calling and called, TG only transmits to the opposite end.
2, translative mode
So-called translative mode; The sip message of sending for calling and called exactly, TG are not only revised the source address in the SDP message body, but also can be according to user's setting; Sip message and SDP media capability information wherein to receiving reorganize the new message of back generation, send to the opposite end then.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 the SIP session was set up, session one end may require the media capability of current use is made amendment, and at this moment, can send to the opposite end and heavily invite (ReInvite) message, and this message possibly carried SDP message body, also possibly not carry SDP message body.But; Call out and charging safety in order to guarantee at present; Most of ITSP servers do not allow in the SIP session of having set up, to send not come the media capability of current use is made amendment with the ReInvite message of SDP media capability information; In this case, TG adopts translative mode usually, after receiving the ReInvite message of not carrying SDP message body, to carry out adaptation processing.
Because adopting translative mode to carry out in the process of SDP media capability negotiation, TG controls the media capability negotiation with calling and called respectively, can exist the three not exist media capability to occur simultaneously and cause calling out situation about can't set up; In addition; TG carries out the SDP media capability negotiation with calling and called respectively, and in this process, the media capability that TG and calling and called are consulted out also maybe be inconsistent; Also need TG that the dissimilar RTP message of receiving from an end is carried out sending to the other end after the encoding and decoding conversion again this moment; TG also need support the transfer capability of isomery encoding and decoding message like this, and device hardware is had relatively high expectations, and is also influential to call features.
Summary of the invention
The present invention is provided at method and the SIP trunk gateway of revising media capability in the SIP session, to guarantee that in the SIP session, revising message through the media capability that does not carry the SDP media capability can successfully revise media capability.
Technical scheme of the present invention is achieved in that
A kind of method of in Session initiation Protocol SIP session, revising media capability; 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 through SIP, this method comprises:
The SIP trunk gateway receives the SIP session of originating side sent and sets up request message, sends the media capability request message to target side, the media capability collection of the target side that reception and record object side return; Perhaps, the SIP trunk gateway receives the SIP session of originating side sent and sets up the completion acknowledge message, sends the media capability request message to target side, the media capability collection of the target side that reception and record object side return;
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 that writes down is put into said media capability revise message; This media capability is revised forwards give the initiator; And the response message that carries media capability that the initiator sends is transmitted to target side, the media capability that carries in the response message that wherein initiator sends is to concentrate one or more media capability of selecting from the media capability of target side.
Said media capability request message is the SIP option message.
Said 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 of said SIP trunk gateway reception originating side sent is set up request message and is:
The SIP trunk gateway receives the sip invite message of originating side sent.
The SIP session foundation completion acknowledge message that said SIP trunk gateway receives originating side sent is:
The SIP trunk gateway receives the indication SIP session of originating side sent and sets up the SIP acknowledge message of accomplishing.
A kind of SIP trunk gateway comprises:
The media capability request module: request message is set up in the SIP session that receives originating side sent, sends the media capability request message to target side, the media capability collection of the target side that reception and record object side return;
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 said media capability revise message, this media capability is revised forwards give the initiator.
Said media capability request message is the SIP option message.
Saidly do not revise message and be: with the heavy invitation message of SIP of Session Description Protocol SDP message body with the media capability of media capability information.
Request message is set up in said SIP session: sip invite message.
A kind of SIP trunk gateway comprises:
The media capability request module: the completion acknowledge message is set up in the SIP session that receives originating side sent, sends the media capability request message to target side, the media capability collection of the target side that reception and record object side return;
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 said media capability revise message, this media capability is revised forwards give the initiator.
Said media capability request message is the SIP option message.
Saidly do not revise message and be: with the heavy invitation message of SIP of Session Description Protocol SDP message body with the media capability of media capability information.
The completion acknowledge message is set up in said SIP session: the SIP acknowledge message of accomplishing is set up in indication SIP session.
Compared with prior art; Among the present invention, request message or SIP session foundation completion acknowledge message are set up in the SIP session that receives originating side sent when the SIP trunk gateway, obtain the media capability collection of target side to target side; After this; When the SIP trunk gateway receive that target side sends do not revise message with the media capability of media capability information the time, the media capability collection of target side is put into said media capability revises message, revise message thereby avoided sending with the media capability of media capability information to the ITSP network; Make the initiator can obtain the media capability collection of target side simultaneously, guaranteed that the media capability modification completes successfully.
Description of drawings
Fig. 1 is the typical application scene graph of existing SIP Trunk;
The method flow diagram of in the SIP session, revising media capability that Fig. 2 provides for the embodiment of the invention one;
The method flow diagram of in the SIP session, revising media capability that Fig. 3 provides for the embodiment of the invention two;
The composition sketch map of the SIP trunk gateway that Fig. 4 provides for the embodiment of the invention one.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is remake further detailed explanation.
The method flow diagram of in the SIP session, revising media capability that Fig. 2 provides for the embodiment of the invention one, as shown in Figure 2, its concrete steps are following:
Step 201: the initiator sends SIP to SIP trunk gateway (TG) and invites (Invite) message, carries initiator's media capability that the initiator provides in the SDP message body of this message.
The initiator possibly be the interior terminal of enterprise network with the IP-PBX that supports SIP, or through SIP the interior terminal of ITSP net of voice communication architecture is provided; Target side possibly be that the interior terminal of ITSP net of voice communication architecture is provided through Session Initiation Protocol, or has the interior terminal of enterprise network of the IP-PBX that supports SIP.
Step 202:TG receives SIP Invite message, according to the target side address in the message, sends SIP option (OPTIONS) message to target side, with the media capability collection of acquisition request target side.
The SIP OPTIONS message here can be used the SIPOPTIONS message that proposes among the SIP basic agreement RFC3261.
Step 203: target side receives SIP OPTIONS message, returns 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, from the SDP message body of this message, obtains the media capability collection of target side.
Step 205:TG gives target side with SIP Invite forwards.
Step 206: target side receives SIP Invite message, returns SIP 180 rings (Ringing) message through TG to the initiator; Simultaneously; Initiator's media capability in that SIP Invite message is carried is concentrated the media capability of selecting one or more target side to support; The media capability that the media capability of selecting is replied as this target side is put into SIP 200Ok message, SIP 200Ok message is returned to the initiator through TG.
Step 207: the initiator receives SIP 200Ok message, writes down the media capability that target side that this message carries is replied, and returns SIP through TG to target side and confirms (Ack) message.
After this, initiator and target side adopt the media capability media stream in the SIP 200Ok message in the step 206.
Step 208: target side will be revised the media capability of current use, sends SIP ReInvite message to the 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; Then the media capability collection of the target side of obtaining in the step 204 is constructed SDP message body as the media capability that target side provides; This SDP message body is put into SIP ReInvite message, give the initiator SIP ReInvite forwards.
Step 210: the initiator receives SIP ReInvite message; Concentrate the media capability of selecting one or more initiators to support from the media capability of SDP message body; The media capability that the media capability of selecting 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, with the media capability that the media capability in the SDP message body provides as the initiator, gives target side with SIP 200 Ok forwards.
Step 212: target side receives SIP 200 Ok message; Media capability in the record 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, returns this SIP Ack message to TG.
After this, target side and initiator use the media capability media stream in the SIP 200 Ok message in the step 212.
Step 213:TG receives SIP Ack message, transmits SIP Ack message to the initiator.
TG can not carry SDP message body to the SIP Ack message that the initiator transmits.
The flow chart of in the SIP session, revising media capability that Fig. 3 provides for the embodiment of the invention two, as shown in Figure 3, its concrete steps are following:
Step 301: the initiator sends SIP Invite message to TG, carries initiator's media capability collection that the initiator provides in the SDP message body of this message.
The initiator possibly be the interior terminal of enterprise network with the IP-PBX that supports SIP, or through SIP the interior terminal of ITSP net of voice communication architecture is provided; Target side possibly be that the interior terminal of ITSP net of voice communication architecture is provided through Session Initiation Protocol, or has the interior terminal of enterprise network of the IP-PBX that supports SIP.
Step 302:TG receives SIP Invite message, gives target side with SIP Invite forwards.
Step 303: target side receives SIP Invite message, returns SIP 180Ringing message through TG to the initiator; Simultaneously; Initiator's media capability in that SIP Invite message is carried 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, SIP 200 Ok message are returned to the initiator through TG.
Step 304: the initiator receives SIP 200 Ok message, writes down the media capability that target side that this message carries is replied, and returns SIP Ack message to TG.
Step 305:TG receives SIP Ack message, gives target side with this SIP Ack forwards, simultaneously, according to the target side address in the SIP Ack message, sends SIP OPTIONS message to target side, with the media capability collection of acquisition request target side.
After this, initiator and target side adopt the media capability media stream in the SIP 200 Ok message in the step 303.
Step 306: target side receives SIP OPTIONS message, returns 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, from the SDP message body of this message, obtains the media capability collection of target side.
Step 308: target side will be revised the media capability of current use, sends SIP ReInvite message to the 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; Then the media capability collection of the target side of obtaining in the step 307 is constructed SDP message body as the media capability that target side provides; This SDP message body is put into SIP ReInvite message, give the initiator SIP ReInvite forwards.
Step 310: the initiator receives ReInvite message; Concentrate the media capability of selecting one or more initiators to support from the media capability of SDP message body; 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, with the media capability that the media capability in the SDP message body provides as the initiator, gives target side with SIP 200 Ok forwards.
Step 312: target side receives SIP 200 Ok message; Media capability in the record 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, returns this SIP Ack message to TG.
After this, target side and initiator use the media capability media stream in the SIP 200 Ok message in the step 311.
Step 313:TG receives SIP Ack message, transmits SIP Ack message to the initiator.
TG can not carry SDP message body to the SIP Ack message that the initiator transmits.
The composition sketch map of the SIP trunk gateway that Fig. 4 provides for the embodiment of the invention one, as shown in Figure 4, it mainly comprises: media capability request module 41 is revised processing module 42 with media capability, wherein:
Media capability request module 41: the SIP Invite message that receives originating side sent; Send SIP OPTIONS message to target side; 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, give the initiator SIP ReInvite forwards.
Below provide the composition sketch map of the SIP trunk gateway that the embodiment of the invention two provides, it mainly comprises: media capability request module and media capability are revised processing module, wherein:
The media capability request module: the SIP Ack message of accomplishing is set up in the indication SIP session that receives originating side sent; Send SIP OPTIONS message to target side; 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, give the initiator SIP ReInvite forwards.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (13)
1. method of in Session initiation Protocol SIP session, revising media capability; 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 through SIP; It is characterized in that this method comprises:
The SIP trunk gateway receives the SIP session of originating side sent and sets up request message, sends the media capability request message to target side, the media capability collection of the target side that reception and record object side return; Perhaps, the SIP trunk gateway receives the SIP session of originating side sent and sets up the completion acknowledge message, sends the media capability request message to target side, the media capability collection of the target side that reception and record object side return;
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 that writes down is put into said media capability revise message; This media capability is revised forwards give the initiator; And the response message that carries media capability that the initiator sends is transmitted to target side, the media capability that carries in the response message that wherein initiator sends is to concentrate one or more media capability of selecting from the media capability of target side.
2. method according to claim 1 is characterized in that, said media capability request message is the SIP option message.
3. method according to claim 1 is characterized in that, said 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 of said SIP trunk gateway reception originating side sent is set up request message and is:
The 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 foundation completion acknowledge message that said SIP trunk gateway receives originating side sent is:
The SIP trunk gateway receives the indication SIP session of originating side sent and sets up the SIP acknowledge message of accomplishing.
6. a SIP trunk gateway is characterized in that, comprising:
The media capability request module: request message is set up in the SIP session that receives originating side sent, sends the media capability request message to target side, the media capability collection of the target side that reception and record object side return;
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 said media capability revise message, this media capability is revised forwards give the initiator.
7. SIP trunk gateway according to claim 6 is characterized in that, said media capability request message is the SIP option message.
8. SIP trunk gateway according to claim 6 is characterized in that, does not saidly revise message with the media capability of media capability information 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, said SIP session is set up request message and is: sip invite message.
10. a SIP trunk gateway is characterized in that, comprising:
The media capability request module: the completion acknowledge message is set up in the SIP session that receives originating side sent, sends the media capability request message to target side, the media capability collection of the target side that reception and record object side return;
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 said media capability revise message, this media capability is revised forwards give the initiator.
11. SIP trunk gateway according to claim 10 is characterized in that, said media capability request message is the SIP option message.
12. SIP trunk gateway according to claim 10 is characterized in that, does not saidly revise message with the media capability of media capability information and is: with the heavy invitation message of SIP of Session Description Protocol SDP message body.
13. SIP trunk gateway according to claim 10 is characterized in that, said SIP session is set up the completion acknowledge message and is: the SIP acknowledge message of accomplishing is set up in indication SIP session.
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| CN102387124B (en) | 2014-05-07 |
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