CN101803324A

CN101803324A - Method and system for processing sip message with rtsp encapsulation in ims

Info

Publication number: CN101803324A
Application number: CN200780100643.1A
Authority: CN
Inventors: 尹爱昊
Original assignee: Lucent Technologies Inc
Current assignee: Nokia of America Corp
Priority date: 2007-09-20
Filing date: 2007-09-20
Publication date: 2010-08-11
Also published as: WO2009036605A1

Abstract

The invention proposes a method and system for processing SIP message with RTSP encapsulation in IMS. The method comprises the following steps: defining a new SIP content type; and encapsulating a RTSP message into a SIP message with the new SIP content type. The invention realizes the use of the IMS security features, the reuse of the IMS QoS framework, the use of the existing IMS charging system, and the convergence of the RTSP-based services, such as IPTV and VoD, with the existing SIP-based IMS services.

Description

In IMS, handle the method and system of sip message with RTSP encapsulation

Technical field

The present invention relates in general to data communication field, in particular to the method and system that utilizes real time streaming protocol (rtsp) encapsulation process session initiation protocol (SIP) message in IP Multimedia System (IMS).

Background technology

IMS (IP Multimedia System) is the new scheme that is used for multimedia service, and it can satisfy the new and various requirements that the terminal use proposed on the multimedia service.At present, IMS is considered as core technology in the next generation network (NGN).RTSP and SIP are application layer protocols, and transmit by IP network.IMS UE (subscriber equipment), for example 3G mobile has supported Session Initiation Protocol to initiate or terminated speech and video session.With traditional different, these UE are not used further to single goal.They can be enhanced to support other functional, for example visit IPTV (IPTV/VOD) and VoD (video request program) service.Can easily on terminal equipment, carry out the RTSP agreement in order to support the IPTV/VoD service.

The RTSP that is developed and be issued as in 1998 real-time streaming protocol (RFC) 2326 by IETF is the agreement that is used for stream media system.It provides the extendible frame that allows client Long-distance Control streaming media server, sends similar VCR order, and for example " broadcast " and " time-out ", and allow based on the file on the time access server.The RTSP order comprises: describe (DESCRIBE), set up (SETUP), play (PLAY), suspend (PAUSE), record (RECORD) is closed (TEARDOWN) or the like.RTSP message comprises two types: request and response, wherein their form differs from one another, as following detailed explanation.

Request message:

Method URI RTSP-version CR LF

Message header CR LF

Source body CR LF

Wherein, term " method " is meant any order in all available commands; " URI " is recipient address, for example rtsp: // 192.168.20.136; " RTSP-version " is typically RTSP/1.0; " the CR LF " of every line endings represents carriage return or line feed.

Response message:

RTSP-release status-code interpreter CR LF

Message header CR LF

Source body CR LF

Wherein, term " RTSP-version " is typically RTSP/1.0; " state-code " is a numerical value, for example 200, and the state that its indication is successful; " explanation " is the text interpretation corresponding to " state-code ".

RTSP transmits by Transmission Control Protocol usually.Alternatively, also can carry out by HTTP(Hypertext Transport Protocol).

Session initiation protocol (SIP) is application layer control (signaling) agreement, is used to create, revise and termination and one or more participants' session.These sessions comprise internet telephone cell, multimedia issue and multimedia conferencing.SIP is based on the messaging protocol of text.Session is set up in it and the operation independently mutually of lower floor's network transmission protocol between a plurality of users, and no matter the data of transmission are text data, voice data or video data.Basic SIP method comprises: invites (INVITE), cancellation (CANCEL), bids farewell (BYE), option (OPTIONS), message (MESSAGE), orders (SUBSCRIBE), notice (NOTIFY), or the like.

Session Initiation Protocol makes the terminal use to communicate with one another by message.The citation form of message can be the request that is sent to server from client, or from the answer of server to client.Message comprises begin column, one or more header fields, the null of the end of indication header fields, and optional source body.The general structure of sip message is as follows:

General message=begin column

Message header field 1

Message header field 2

…

CR?LF

Source body (optional)

Begin column=request row/statusline

Sip message comprises two types: request and response.By existing the request row to go to start with, can discern sip request message.The form of request row is as follows:

Request row=method SP request-URI SP SIP-version CR LF

Go to start with by existence is capable, can discern sip response message.The form of statusline is as follows:

Statusline=SIP-version SP state-code SP reason phrase CR LF

In reality was carried out, RTSP only related to the business between media server and the media client, and SIP relates to route and service control that many network componentses are used for IMS network message.Although the both relates to the foundation and the control of real-time media stream, they are used to have the difference service of heterogeneous networks system.

Visit IPTV and VoD service for the IMS subscriber, some existing execution modes preferably do not use RTSP in the IMS network.SIP is used for setting up session with remote I PTV/VoD server.The user need use button to shine upon the analog media control operation, for example plays, time-out, F.F. or the like.This is highly beneficial for some that do not support the RTSP client functionality are left over the SIP video endpoint, but the control of these services nature, and preferably these clients also need to support RTSP.

Some new end points are supported SIP and RTSP independently.Yet because RTSP to be being different from the path flow of SIP, therefore the possibility of control IPTV/VoD is minimum in IMS or VoIP (IP phone) network.And these services will utilize in IMS or voip network existing QoS (service quality), safety and charge framework also very difficult.In addition, the IPTV/VoD service being mixed mutually with existing IMS or VoIP service also is mathematical chance.

Therefore, in the prior art, as more effective mode how these two kinds of separate networks are merged mutually to reduce system cost and to remain a kind of challenge.Therefore, need simultaneously and effectively support the method and system of SIP and RTSP in this area.

Summary of the invention

The present invention is proposed in order to address the above problem.According to an aspect of the present invention, propose in IMS, to handle the method for sip message, comprise following steps with RTSP encapsulation:

Define new SIP content type; And

Utilize described new SIP content type that RTSP message is encapsulated in the sip message.

According to a further aspect of the invention, propose in IMS, to handle the system of sip message, comprising with RTSP encapsulation:

Subscriber equipment utilizes the SIP content type of redetermination that RTSP message is encapsulated in the sip message, and utilizes the SIP content type of described redetermination to extract RTSP message from sip message; And

At least one network components among the IMS;

At least one network components among wherein said subscriber equipment and the IMS is all supported the SIP content type of described redetermination.

The method and system of handling the sip message with RTSP encapsulation in IMS that the present invention proposes is encapsulated into RTSP message in the sip message, thereby utilize the existing use that realizes the IMS security feature based on the IMS service of SIP, re-using of IMS QoS framework, the use of existing IMS Fare Collection System, and concentrating based on the service (for example IPTV and VoD) of RTSP.

Description of drawings

In the claim of enclosing, set forth novel feature of the present invention.Yet, by reading, can understand the present invention itself and preference pattern thereof best below in conjunction with the detailed description of accompanying drawing to exemplary embodiment, and other targets and advantage, in the drawings:

Fig. 1 example have the independently exemplary IMS system of SIP and RTSP message flow;

Fig. 2 example support has the integration system of the SIP of RTSP encapsulation according to the embodiment of the invention; And

Fig. 3 example support has the exemplary scenario of the SIP of RTSP encapsulation according to the embodiment of the invention.

Embodiment

For accurately and understand this specification all sidedly, describe following with reference to exemplary IMS system according to some parts that relate in the processing of the SIP of the RTSP of having encapsulation of the present invention and the configuration.In addition, such system has also presented the origination message stream among the IMS.

Referring now to accompanying drawing, Fig. 1 particularly, example have the independently exemplary IMS system of SIP and RTSP message flow.In Fig. 1, subscriber equipment (UE) 110 conducts interviews by 100 pairs of services 190 of IMS, for example IPTV and VoD.IMS subscriber equipment (UE) is the device that allows the customer access network service, for example is 3G mobile, SIP phone or operate in soft client on the PC.UE supports a plurality of audio/video media codecs, and can initiate or stop via the session of SIP interface to IMS.

IMS 100 comprises P-CSCF 120, and S-CSCF 130, and I-CSCF 140, and AS 150, HSS160, and CRF 170, and carrier network 180.Particularly, CSCF (CSCF) is the core of IMS system.All SIP signalings all will be by CSCF, and it is regarded as the necessary node among the IMS.CSCF verifies each sip message, determines whether signaling should visit the one or more application servers (AS) on the path of leading to its final destination.

First communication center in the P-CSCF (agreement CSCF) the 120th, IMS.It act as similar Session Initiation Protocol server, and just, it accepts request from UE 110, and it is forwarded.P-CSCF120 can also initiate QoS control based on the session description information that receives in the sip message.

S-CSCF (serving CSCF) 130 carries out the session control service that is used for UE.It supports the needs of serving to keep session status according to the network operator.It is based on inceptive filtering criterion (iFC) the treatment S IP request of downloading from home subscriber servers (HSS).Wherein, inceptive filtering criterion (iFC) comprises the rule of the service request that is used to handle the subscriber, and described service request for example is to route requests to concrete AS, the I-CSCF/RTSP gateway, or the like.In case UE successfully registers, this standard is downloaded by S-CSCF.It can expand to and comprise filtering rule, is used for handling the RTSP main body that is encapsulated in the SIP request.S-CSCF is at the SIP network components, P-CSCF for example, relaying sip message between AS and the I-CSCF etc.It also produces call detail record (CDR) and is used for bill.

I-CSCF (inquiry CSCF) the 140th leads to the user of operator network, or leads to the roamer's of the coverage that is arranged in this network operator at present the cutting point of all connections.When transmitting sip message between the field different network operators, I-CSCF hides network topological information.I-CSCF can also initiate QoS control based on the session description information that receives in the sip message.

AS (application server) the 150th, IMS application server, its run user IMS subscriber's IMS applied logic.When the service scenario of checking the subscriber finds that also having enabled IMS uses, S-CSCF will call AS.For each the IMS service in the service scenario provides effective AS name/address.

HSS (home subscriber servers) the 160th, the IMS subscriber database, it comprises all IMS subscriber service profile, for example, iFC, log-on data, service filter criteria, service data, and position data.

CRF (fees policy function) 170 is based on the main entity of flow charging.CRF can be applicable to off-line charge and online charging.The defined fees policy of system operator is delivered to CRF by unified interface, to charge at service that provides and content.

Carrier network 180 is the networks that are used for transmission data between UE.In the life cycle of a session, can use many carrier network.

Carrier network 180 and P-CSCF120 carry out QoS control respectively.The SIP that is shown in dotted line among Fig. 1 flows.Successively by P-CSCF 120, S-CSCF 130 from UE 110 for SIP stream, and I-CSCF 140 transmits, perhaps in the opposite direction.S-CSCF 130 can also be respectively and AS 150, and HSS 160, CRF 170 exchange sip messages.Solid arrow among Fig. 1 represents that the RTSP via carrier network 180 flows between UE 110 and the IPTV/VoD service 190.Dotted line among Fig. 1 is represented between UE 110 and the IPTV/VoD service 190 carrier current via carrier network 180.

As mentioned above,, therefore can not in IMS or voip network, control the IPTV/VoD service, and make these services can utilize existing QoS in IMS or the voip network, the safety and the very difficulty of framework of charging because RTSP stream flows according to different paths with SIP.In addition, the IPTV/VoD service also can not combine with existing IMS or VoIP service.

Therefore, in the present invention, the problem that a kind of new method and system solves proposition has been proposed.It utilizes sip message to carry RTSP message in the IMS/VoIP network.Be replaced in direct and remote I PTV/VoD server contact, IMS UE is encapsulated into RTSP message among the sip message, and by the IMS network components it is transmitted, to promote that the RTSP related service is focused on existing IMS system.Especially, IMS UE sends to P-CSCF with sip message.Then, P-CSCF is transmitted to S-CSCF with sip message, and the latter handles and be transmitted to I-CSCF to this message.I-CSCF extracts RTSP message from the sip message that receives then, and sends it to long-range RTSP server, and by original sip message routed path RTSP is responded backward relaying and get back to UE.

Now, with reference to Fig. 2, example support has the integration system of the SIP of RTSP encapsulation according to the embodiment of the invention.In Fig. 2, subscriber equipment (UE) 210 is by IMS 200 access services 290, for example IPTV and VoD.IMS comprises P-CSCF 220, and S-CSCF 230, and I-CSCF 240, and AS 250, and HSS 260, and CRF 270, carrier gateway 285, and carrier network 280.Except carrier gateway 285, among Fig. 2 every other parts all with shown in Figure 1 similar, but have some reinforcements according to the present invention.

At first, defined IMS SIP interface, just, defined new SIP content type, made RTSP message to be packaged in the sip message with new content type.For example:

Content-type：application/RTSP

The sip message that its expression has this content type encapsulates RTSP message within it.New content type need obtain the support of related various IMS network componentses, and is as described below.

IMS UE 210 has following reinforcement:

Add a config option, RTSP message is encapsulated as the sip message main body;

Under the situation that this option is enabled, in case initiate service request (IPTV/VoD, or the like) based on RTSP, UE just is encapsulated into RTSP message SIP MESSAGE (message) method, and sends it to P-CSCF, rather than directly sends RTSP message.

The P-CSCF 220 that wherein comprises QoS application function (QoS AF) 225 is first cuttings point for the IMS network of UE, wherein strengthens to comprise:

Discern above-mentioned new SIP content type, just, recognize in sip message, to have encapsulated RTSP message, and this sip message with RTSP message of encapsulation is forwarded to S-CSCF.

Analyze packaged RTSP message and be used for media description information, be used for the RTSP session with request QoS resource.This is the function of selective enabling of the present invention.

Relaying has the sip message of the RTSP message of encapsulation between UE and S-CSCF.

Additionally, now P-CSCF might be from RTSP message analysis various requirement, bandwidth for example, and speed, and use existing qos feature to initiate QoS control.QoS AF 225 can communicate by letter with carrier gateway 285 and be used for QoS control.

S-CSCF 230 is the network componentses of serving the service request of UE, wherein strengthens to comprise:

Discern new SIP type of subject, and analyze packaged RTSP message.

Which determine forwards to RTSP gateway.

Alternatively, the RTSP forwards with encapsulation arrives sip application server (AS).This provides the chance of service combination and the possibility of the service that some are more complicated.

Collect and to IMS charge function, for example CRF 260, the relevant pay imformation of report RTSP.

From ims database, for example HSS 260 asks IMS subscriber service profile.IMS subscriber service profile includes but not limited to inceptive filtering criterion (iFC), log-on data, service filtering data, service data, and position data.Especially, iFC is used to handle the sip message of the RTSP message with encapsulation, for example, this message is routed to concrete AS, the I-CSCF/RTSP gateway, or the like;

The sip message that relaying has the RTSP message of encapsulation between two network componentses in IMS, for example, between P-CSCF and RTSP gateway, or between SIP AS and RTSP gateway.

I-CSCF 240 comprises new RTSP gateway 245.New RTSP gateway 245 will be deployed in the edge of IMS network, preferably as the part of I-CSCF, but not necessary.I-CSCF 240 carries out following function:

From the sip message that receives, extract the RTSP message of encapsulation.

Carry out DNS (domain name service) inquiry of the RTSP that indicates among the RTSP URL, and the RTSP request is sent to outside RTSP server.

Receive the RTSP response from the RTSP server, and it is encapsulated in the sip message.

The sip message that will have the RTSP message of encapsulation is relayed to S-CSCF.

Dotted arrow indication SIP stream among Fig. 2.Successively by P-CSCF 220, S-CSCF 230 from UE210 for SIP stream, and I-CSCF 240 transmits, perhaps in the opposite direction.S-CSCF 230 respectively with AS250, HSS 260, CRF 270 exchange sip messages.Solid arrow among Fig. 2 is represented the RTSP stream between I-CSCF 240 and the IPTV/VoD service 290.Dotted line among Fig. 2 is represented between UE 210 and the IPTV/VoD service 290 carrier current via carrier network 280.Solid line among Fig. 2 is represented QoS control.

According to the detailed description of above integrated IMS system to the SIP that supports to have the RTSP encapsulation, those skilled in the art can easily understand the advantage with respect to prior art, and are following listed:

The use of IMS security feature:, for example, can protect RTSP message safely by the SIP of IPSec (IP fail safe) or TLS (transport layer protocol) by safety SIP transmission.

Re-using of IMS QoS framework: can analyze QoS resource request in the RTSP message by sip server, thereby carry out QoS control by the existing network interface between sip server and the strategy decision function.

RTSP service now can utilize the existing Fare Collection System of IMS service.

Based on the service of RTSP, for example IPTV and VoID, can with existing IMS services set based on SIP in.

Notice that design and the executive mode of the SIP of the aforesaid RTSP of having encapsulation can be used and other networks based on SIP, IMS for example, preceding IMS voip network, or the like.Such executive mode also falls within the spirit and scope of the present invention.

Referring now to Fig. 3, example have the exemplary scenario of the SIP of RTSP encapsulation according to the support of the embodiment of the invention.For self-consistentency, simple and understanding easily, the IMS system that has the SIP of RTSP encapsulation in conjunction with support shown in Figure 2 illustrates this exemplary scenario.

Beginning, in step 1, subscriber (user) browses IPTV and the VoD program of listing on its IMS UE.By clicking or select the RTSP link, for example, rtsp: //vod.example.com/music 1123.en, carry out the selection of program.

In step 2, IMS UE is configured to use the Session Initiation Protocol config option to carry out the RTSP encapsulation.Be replaced in directly RTSP is linked rtsp: //vod.example.com sends to the RTSP server, and UE is encapsulated into initial RTSP DESCRIBE (description) request in SIP MESSAGE (message) method, and sends it to P-CSCF.As an example, it is as follows to have a sip message of RTSP message of encapsulation.

MESSAGE?sip:p-cscf@ims-domain.com:5060?SIP/2.0

Via:SIP/2.0/UDP?10.86.9.26:5060；branch＝z9hG4bK421eb

From:“Joe?Smith”<sip:imsue1@ims-domain.com:5060>；tag＝15c31

To:sip:p-cscf@ims-domain.com:5060

Call-ID:UNSET000.20050224.073704.1@10.869.26

CSeq:1234MESSAGE

Contact:<sip:imsue1@10.86.9.26:5060；user＝phone>

Content-Type:application/RTSP

Content-Length:121

DESCRIBE?rtsp://vod.example.com/music1123.en?RTSP/1.0

CSeq:312

ACSCFept:application/sdp，application/rtsl，application/mheg

Then, in step 3, P-CSCF discerns this new SIP content type: " application/RTSP ", and with this forwards to the S-CSCF that serves this UE.

In step 4, in case receive the sip message with RTSP encapsulation, S-CSCF determines whether content-based type " application/RTSP " and this application scenarios of this content application.If then process advances to step 4a, wherein S-CSCF arrives AS to trigger applied logic with forwards.This provides the chance of service combination and the possibility of some more complicated services.Alternatively, at step 4b, S-CSCF collects and to IMS charge function, for example CRF 270, the relevant pay imformation of report RTSP.Alternatively, at step 4c, S-CSCF is from ims database, and for example HSS 260, request IMS subscriber service profile.No matter be execution in

step

4a, 4b or 4c, S-CSCF selects I-CSCF based on the RTSP destination that (from P-CSCF or from AS) receives the RTSP message of encapsulation, and sip message is sent to I-CSCF.

Then, in step 5, I-CSCF really receives this sip message with SIP " 200OK " response, extracts RTSP message from this sip message, and sends it to long-range RTSP server based on the information in the RTSP message.

As an example, by S-CSCF, it is as follows that AS (alternatively) and P-CSCF send it back the sip response of UE backward:

SIP/2.0200OK

Via:...

From:“Joe?Smith”<sip:imsue1@ims-domain.com:5060>；tag＝15c31

To:sip:p-cscf@ims-domain.com:5060

Call-ID:UNSET000.20050224.073704.1@10.86.9.26

CSeq:1234?MESSAGE

Content-Length:0

And?the?RTSP?message?sent?to?the?remote?RTSP?server?vod.example.com?is?shown?as?below:

DESCRIBE?rtsp://vod.example.com/music1123.en?RTSP/1.0

CSeq:312

ACSCFept:application/sdp，application/rtsl，application/mheg

, notice 1 for this reason) according to Session Initiation Protocol, the SIP method should really be received with sip response.In ensuing several steps, acquiescence be, SIP MESSAGE (message) method always uses SIP " 200OK " response really to receive immediately by long-range SIP end (UE or I-CSCF), this response will be crossed IMS core network (S-CSCF/AS/P-CSCF) usually; 2) I-CSCF can get in touch the IP address that domain name service (DNS) server obtains the parsing of RTSP server.

In step 6, the RTSPDESCRIBE order is really received in long-range RTSP server by utilizing RTSP " 200OK " response, and sends it to I-CSCF.The exemplary RTSP response that sends to I-CSCF is as follows:

RTSP/1.0200OK

CSeq:312

Content-Type:application/sdp

Content-Length:182

v＝0

o＝mhandley?28908445262890842807?IN?IP4?126.16.64.4

s＝SDP?Seminar

c＝IN?IP4?224.2.17.12

t＝28733974962873404696

a＝recvonly

m＝audio?3456?RTP/AVP?0

m＝video?2232?RTP/AVP?31

a＝orient:portrait

Then, in step 7, I-CSCF uses SIP MESSAGE method encapsulation RTSP " 200OK " response, and sends it to S-CSCF.The exemplary sip message of the RTSP response with encapsulation that sends to S-CSCF is as follows:

MESSAGE?sip:imsue1@ims-domain.com?SIP/2.0

Via:SIP/2.0/UDP?10.86.5.35:5060；branch＝z9hG4bK43567

From:<sip:i-cscf@ims-domain.com:5060>；tag＝4564

To:“Joe?Smith”<sip:imsue1@ims-domain.com:5060>；

Call-ID:1232343453534@10.86.5.35

CSeq:5589?MESSAGE

Contact:<sip:i-cscf@10.86.5.35:5060>

Content-Type:application/RTSP

Content-Length:254

RTSP/1.0200OK

CSeq:312

Content-Type:application/sdp

Content-Length:182

v＝0

o＝mhandley?2890844526?2890842807?IN?IP4?126.16.64.4

s＝SDP?Seminar

c＝IN?IP4?224.2.17.12

t＝2873397496?2873404696

a＝recvonly

m＝audio?3456?RTP/AVP0

m＝video?2232?RTP/AVP?31

a＝orient:portrait

In step 8, S-CSCF transmits back P-CSCF with sip message then.Alternatively, if in step 4, S-CSCF determines to use above-mentioned application scenarios, has just triggered any application as described in step 4a, and so at step 8a, S-CSCF was forwarded to AS with it before sip message is forwarded to P-CSCF.

In step 9, P-CSCF will have the sip message of the RTSP response of encapsulation and transmit back IMSUE.

In step 10, UE extracts the RTSP response from the sip message that receives, and proceeds ensuing order along same message flow, for example initiates Media Stream by sending RTSP PLAY order.

Dotted arrow shown in Fig. 3, solid arrow, dotted line and solid line represent with Fig. 2 in identical label, therefore skip over its detailed description.

The detailed description of the exemplary scenario of the SIP that support according to the embodiment of the invention has the RTSP encapsulation above, is provided.Those skilled in the art obviously as seen, above-mentioned steps is as just example, is not intended to limit or exhaustive.

The detailed description of handling the method and system of the sip message with RTSP encapsulation according to the present invention in IMS is provided above with reference to embodiment.Those skilled in the art will realize that the present invention can be implemented as method, system and/or computer program.Therefore, the present invention can realize with the form of hardware, software or its combination.In addition, the present invention can be implemented as the computer program that comprises on the machine readable media, and wherein storage is used for computer system and carries out according to the executable program command of the computer of process of the present invention on described machine readable media.Term used herein " machine readable media " is included as any medium of the instruction that computer system is provided for carrying out.Such medium can be taked various forms, includes but not limited to: non-volatile media, Volatile media, and transmission medium.Non-volatile media generally includes for example floppy disk, floppy disc, hard disk, tape, or any other magnetizing mediums, CD-ROM or any other light medium, slot card or any other have the physical medium of hole pattern, PROM, EPROM, EEPROM, flash memory, any other memory chip or cassette tape perhaps can and be suitable for any other medium of store instruction by computer system reads.

Although specifically describe and the present invention has been described, be not intended the present invention is exhaustive or be restricted to disclosed form with reference to preferred embodiment.Modification on many forms and the details will become apparent to those skilled in the art that and without departing from the spirit and scope of the present invention.Select and described some embodiment in order to disclosing principle of the present invention best, actual application, and make others skilled in the art can understand the present invention, because have the specific use that the various embodiment of various modifications are suitable for expecting.

Claims

1. method that is used for handling at IMS the sip message with RTSP encapsulation may further comprise the steps:

Define new SIP content type; And

2. according to the method for claim 1, further comprising the steps of: between any two network componentses in IMS, or the sip message that relaying has the RTSP message of encapsulation between the network components in subscriber equipment and IMS.

3. utilize described new SIP content type that the step that RTSP message is encapsulated in the sip message is comprised according to the process of claim 1 wherein:, just to initiate described encapsulation in case enable config option.

4. according to the method for claim 1, further comprising the steps of: as to analyze the RTSP message of the encapsulation that is used for qos requirement, be used for RTSP session QoS resource and utilize the carrier gateway to initiate QoS control with request.

5. according to the method for claim 1, further comprising the steps of: as to determine which RTSP gateway described sip message is forwarded to.

6. according to the method for claim 1, further comprising the steps of: as, described sip message to be forwarded to the application server that is used to serve combination based on the content of described content type and described sip message.

7. according to the method for claim 1, further comprising the steps of: as to collect and to the relevant pay imformation of IMS charge function report RTSP.

8. according to the method for claim 1, further comprising the steps of: from ims database request IMS subscriber service profile, wherein said IMS subscriber service profile comprises the inceptive filtering criterion of the sip message that is used to handle the RTSP message with encapsulation.

9. according to the method for claim 1, further comprising the steps of: as from the sip message of RTSP message, to extract RTSP message with encapsulation.

10. according to the method for claim 9, further comprising the steps of: carry out the DNS inquiry of RTSP at the IP address of the parsing of outside RTSP server.

11. it is, further comprising the steps of: as the RTSP message of extracting to be sent to outside RTSP server, and receive the RTSP response from the RTSP server according to the method for claim 9.

12. a system that is used for handling at IMS the sip message with RTSP encapsulation comprises:

Subscriber equipment is used for utilizing the SIP content type of redetermination that RTSP message is encapsulated into sip message, and utilizes the SIP content type of described redetermination to extract RTSP message from sip message; And

At least one network components among the IMS is with described communications of user equipment;

13. according to the system of claim 12, wherein said at least one network components is between any two network componentses, or the sip message that relaying has the RTSP message of encapsulation between described subscriber equipment and network components.

14. in a single day according to the system of claim 12, wherein enable config option, described subscriber equipment is just initiated described encapsulation.

15. according to the system of claim 12, wherein said at least one network components analysis is used for the RTSP message of the encapsulation of qos requirement, is used for RTSP session QoS resource and utilizes the carrier gateway to initiate QoS control with request.

16. according to the system of claim 12, wherein said at least one network components determines which RTSP gateway described sip message is forwarded to.

17. according to the method for claim 12, wherein said at least one network components is forwarded to described sip message the application server that is used to serve combination based on the content of described content type and described sip message.

18. according to the system of claim 12, wherein said at least one network components is collected and is reported RTSP relevant pay imformation to IMS charge function.

19. according to the system of claim 12, wherein said at least one network components is from ims database request IMS subscriber service profile, wherein said IMS subscriber service profile comprises the inceptive filtering criterion of the sip message that is used to handle the RTSP message with encapsulation.

20. according to the system of claim 12, wherein said at least one network components extracts RTSP message from the sip message of RTSP message with encapsulation.

21. according to the system of claim 20, wherein said at least one network components is carried out the DNS inquiry of RTSP at the IP address of the parsing of outside RTSP server.

22. according to the system of claim 20, wherein said at least one network components sends to outside RTSP server with the RTSP message of extracting, and receives the RTSP response from the RTSP server.

23. according to the system of claim 20, wherein said at least one network components utilizes described new SIP content type that the RTSP response is encapsulated in the sip message.