CN101631109B - Service identification methods in IP multi-media subsystem - Google Patents
Service identification methods in IP multi-media subsystem Download PDFInfo
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Abstract
The invention discloses two service identification methods in an IP multi-media subsystem. When the first method is adopted to build media session, an MP allocates media stream service marks for the media session, verifies the received media stream, records the traffic of the media characteristic stream and forwards data; and when the second method is adopted to build the media session, an AF allocates media stream service marks for the media session, verifies the received media stream, records the traffic of the media characteristic stream and forwards data. The two methods ensure that operators can realize media service identification and statistics in the process of building the media session in a simple mode.
Description
Technical field
The present invention relates to the communications field, relate in particular to the business recognition method among the IMS (IP Multimedia Subsystem, IP Multimedia System).
Background technology
Because the IMS technology is a kind of IT (Internet Technology; Internet technology) and CT (Communication Technology; Mechanics of communication) integration technology; Therefore operator generally believes that IMS should use the index of " novelty " to reflect this fusion at present, the relation embodiment of this syncretic relation just between the use amount of professional (like VoIP, video traffic etc.) and the use amount of IP bandwidth.The current main realization of IMS be VoIP (Voice over IP; IP phone), video, messaging service, MSRP (Message Sessions Relay Protocol; The message session trunk protocol) etc. professional, can reflect the relation between the use amount of use amount professional among the IMS and IP bandwidth through topmost service traffics among the IMS being carried out statistical analysis.
In the business that IMS realizes; VoIP business and video traffic all are to be carried by RTP (Realtime Transport Protocol RTP); And the network equipment among the present IMS is considered from efficient for the processing of Media Stream mostly; Real-time Transport Protocol is not analysed in depth, therefore can't be distinguished its employed coding protocol, this is a big difficult point of IMS being carried out the service traffics statistical analysis.Can pass through DPI (Deep Packet Inspection, deeply bag is analyzed) technology in the prior art and solve this difficult point.
Session service with based on SIP (Session Initiation Protocol, session initiation protocol) is an example, and the professional main process of setting up is among the IMS at present:
1) be that business is carried out session negotiation through the SIP signaling earlier, confirm professional source IP address and port, purpose IP address and port, and qos parameter etc.;
2) set up service channel according to negotiation parameter;
3) transmitting and receiving service stream on service channel.
See also Fig. 1, this figure is the flow chart that media session is set up in the prior art, and its concrete steps are following:
Step 101, UE (User Equipment, the subscriber equipment) P-CSCF that initiates a session request (Proxy Call Session Control Function, Proxy Call Session Control Function) carry the conversation description parameter in the conversation request;
Step 102, P-CSCF send mandate and authentication request according to the conversation description parameter of carrying in the conversation request to SPDF (Service-based Policy Decision Function is based on the strategy decisive function of business), and request distributes the core-network side terminal;
Step 103, SPDF send ADD (increase) request to C-BGF (Coring Border Gateway Function, core net Border Gateway Function), the terminal of application core-network side;
Step 104, C-BGF send response and give SPDF, wherein carry the core-network side terminal information of applying for;
Step 105, SPDF send mandate and Authentication Response is given P-CSCF, wherein carries the core-network side terminal information of applying for from C-BGF;
Step 106, P-CSCF transmit conversation request, and the media address information in the session characterising parameter is revised as from the address at the core-network side terminal that C-BGF gets access to;
The response message of the conversation request that step 107, P-CSCF receiving step 106 send;
Step 108, P-CSCF send to SPDF and authorize and authentication request, the terminal of request application Access Network side;
Step 109, SPDF send the request of modification to C-BGF, the terminal of request application Access Network side;
Step 110, C-BGF reply response to SPDF, wherein carry the end message of Access Network side;
Step 111, SPDF send mandate and Authentication Response is given P-CSCF, wherein carries the end message of Access Network side;
Step 112, P-CSCF reply conversational response to UE, revise the media address parameter in the conversation description, and notice UE sends the terminal of medium bag to the C-BGF access;
Step 113, session signaling are proceeded to set up up to session alternately;
Step 114, UE send Media Stream to the terminal that C-BGF inserts, and C-BGF sends to Media Stream called according to the media channel that distributes;
Step 115, if C-BGF is provided with the DPI decoder, then DPI can feed back to P-CSCF with the service traffics statistical value that obtains after the decoding.
Visible from above-mentioned flow process, can realize the identification that IP wraps through adopting the DPI technology, can obtain the flow of employed miscellaneous service in theory, but there is following problem in this scheme:
The first, in the IMS network, need configuration to support the data product of DPI; The second, can't detect the tables of data of simple encryption.What DPI solved is application scenarios complicated above the IP network; Application in IMS on the network be the prevision (must dispose and open related service; Otherwise user's request meeting is refused by system); Through the rtp streaming of different coding form is discerned, can realize statistical analysis based on the miscellaneous service of stream, can carry out the flow analysis statistics simultaneously to the packet of MSRP, SIP-MESSAGE equivalent-load messaging service; The running information of related service can be provided for IMS, thereby make rational planning for Network.The problem of this scheme is, the current general network equipment all is indifferent to the coded format of rtp streaming, and therefore not to the RTP identification of decoding, decoding is discerned to RTP if desired, and expectation need take a large amount of cpu resources.
Summary of the invention
The invention provides the business recognition method among the IMS, through the Network structure having been optimized in the identification of different business among the IMS, more reasonably planning operation merchant's Network.
Technical scheme according to the invention is following:
Business recognition method in a kind of IP Multimedia System comprises step:
After A, application function are received the conversation request that has media characteristic that subscriber equipment sends, send the media resource request for allocation to media platform;
B, media platform receiving media resource allocation request, the media characteristic that carries in the analysis request is its definition media stream service mark, and this media stream service mark is fed back to subscriber equipment through application function;
After C, subscriber equipment are received the feedback of media platform, carry out issuing media platform after the medium assembling according to the media stream service mark that feeds back;
D, media platform carry out verification to the media characteristic stream of the subscriber equipment that receives, send to after the verification succeeds end user device, write down the flow of this media characteristic stream simultaneously and transmit data.
Preferably, also comprise step before the said steps A:
Subscriber equipment sends the conversation request that carries the conversation description parameter to application function, comprises the media characteristic of the media characteristic stream of subscriber equipment desire transmission in the said conversation description parameter.
Preferably, among the said step D,, then abandon this media characteristic stream, receive scanning attack to prevent present port if the media characteristic that the media platform verification receives stream does not meet with the media business mark that self defines.
Also comprise step behind the said step D:
When preset timing statistics arrived, media platform was added up and is analyzed with the historical data of transmitting the medium flow of different media characteristic streams according to the media stream service mark.
Preferably, said application function is call conversation control entity or bearing resource controlled entity.
Preferably; Among the said step B; Media platform sends to application function through the media resource assignment response message with the media stream service mark of definition and the Access Network side media address of distribution, through conversational response message this media stream service mark and Access Network side media address is fed back to subscriber equipment by application function then.
Business recognition method in a kind of IP Multimedia System comprises step:
After a, application function are received the conversation request that has media characteristic that subscriber equipment sends; The media characteristic that carries in the analysis request; For its definition media stream service mark, send the media resource request for allocation that carries this media stream service mark to media platform then;
B, media platform receiving media resource allocation request feed back to application function after the media stream service mark binding with resource allocation information and application function distribution, feed back to subscriber equipment by application function;
After c, subscriber equipment are received the feedback of media platform, carry out issuing media platform after the medium assembling according to the media stream service mark that feeds back;
D, media platform carry out verification to the media characteristic stream of the subscriber equipment that receives, send to after the verification succeeds end user device, write down the flow of this media characteristic stream simultaneously and transmit data.
Preferably, also comprise step before the said step a:
Subscriber equipment sends the conversation request that carries the conversation description parameter to application function, comprises the media characteristic of the media characteristic stream of subscriber equipment desire transmission in the said conversation description parameter.
Preferably, in the said steps d,, then abandon this media characteristic stream, receive scanning attack to prevent present port if the media characteristic that the media platform verification receives stream does not meet with the media business mark that application function defines.
Preferably, said application function is call conversation control entity or bearing resource controlled entity.
Preferably; Among the said step b; Media platform sends to application function through the media resource assignment response message with resource allocation information, and application function feeds back to subscriber equipment through conversational response message with the media stream service mark of this resource allocation information and binding thereof.
Also comprise step after the said steps d:
When preset timing statistics arrives; Media platform is added up with the historical data of transmitting the medium flow of different media characteristic streams according to the media stream service mark under the control of application function; Then statistics is reported application function, statistics is analyzed by application function.
To sum up visible; The above-mentioned two kinds of schemes of the present invention have overcome prior art and have set up in the process when adopting the DPI technology that media business is discerned at media session; Need configuration to support the data product of DPI; Can't detect the tables of data of simple encryption, and the problem that takies a large amount of cpu resources, make operator to realize that media session sets up the media business identification and statistics in the process through better simply mode; Thereby make operator further to optimize the Network structure, for operator provides rational Network planning according to this statistic analysis result.
Description of drawings
Fig. 1 is the flow chart that media session is set up in the prior art;
Fig. 2 is for setting up the system architecture diagram of media session among the IMS according to the invention;
Fig. 3 is the realization principle flow chart of the business recognition method among first kind of IMS according to the invention;
Fig. 4 is the flow chart of a kind of preferred embodiment of the business recognition method among first kind of IMS according to the invention;
Fig. 5 is the realization principle flow chart of the business recognition method among second kind of IMS according to the invention;
Fig. 6 is the flow chart of a kind of preferred embodiment of the business recognition method among second kind of IMS according to the invention.
Embodiment
Below in conjunction with each accompanying drawing concrete implementation procedure of the present invention is done further detailed explanation.
See also Fig. 2; This figure is a system architecture diagram of setting up media session among the IMS according to the invention, wherein is communicated with through signal flow between UE and the AF (Application Function, application function); Be communicated with through Media Stream between UE and the MP (Media Portal, media platform).Wherein, comprise P-CSCF, Access-Resource and Admission Control Function (access-in resource admission control function) and SPDF among the AF, comprise RCEF (Resource Control Enforcement Function) and C-BGF among the MP.
The core concept of the business recognition method among first kind of IMS of the present invention is following: set up in the process in the media session business; Be this media session definition media stream service mark and distribution Access Network side media address by MP; By MP the media characteristic stream that receives is carried out verification then; If verification is passed through; Then receive this media characteristic stream and transmit, and write down the flow of this media characteristic stream and transmit data, when preset timing statistics arrival according to the Access Network side media address of distributing; MP adds up and analyzes media flow with different amount and the historical data of transmitting according to the media stream service mark, makes operator further to optimize the Network structure according to this statistic analysis result.See also Fig. 3, this figure is the realization principle flow chart of the business recognition method among first kind of IMS according to the invention, and it mainly comprises step:
Step 301, the UE AF that initiates a session request; Carry the conversation description parameter in this conversation request; This conversation description parameter has Media Stream property parameters (attributes such as VoIP, video, messaging service, MSRP), and AF both can be a call conversation control entity, also can be the bearing resource controlled entity.
Step 302, AF send the media resource request for allocation to MP, and the media resource request for allocation carries said conversation description parameter;
In this step, the media resource request for allocation can be that AF directly sends to MP, and also can be AF sends to MP through other control appliance.
Step 303, MP receiving media resource allocation request are media session definition media stream service mark and distribute Access Network side media address according to the Media Stream property parameters in the conversation description parameter.
Step 304, MP send the media resource assignment response message to AF; Carry Access Network side media address and corresponding media stream service mark that MP distributes in the response message; This response message can directly send to AF by MP, also can send to AF through other control appliance by MP.
Step 305, AF send conversational response message to UE, wherein carry the media stream service mark of MP definition and the Access Network side media address that MP distributes.
Step 306, subsequent session signaling are proceeded alternately, until session is set up.
Step 307, UE utilize Real-time Transport Protocol to send media characteristic stream to MP according to the Access Network side media address of receiving, wherein carry the media stream service mark of MP definition.
After step 308, MP receive media characteristic stream, judge whether media stream service mark in this media characteristic stream and the media stream service mark that self defines meet, if meet; Then accept this media characteristic stream; And according to the Access Network side media address that MP distributes the media characteristic stream of receiving is transmitted, and write down the flow of this media characteristic stream and transmit data, if do not meet; Then abandon this media characteristic stream, receive scanning attack to prevent present port.
Step 309, when the time point of system configuration arrives, MP adds up and analyzes media flow with different amount and the historical data of transmitting according to the media stream service mark.
See also Fig. 4, this figure is the flow chart of a kind of preferred embodiment of the business recognition method among first kind of IMS according to the invention, and it mainly comprises step:
Step 401, UE send conversation request to P-CSCF, carry the conversation description parameter in the conversation request.
Step 402, P-CSCF send mandate and authentication request according to the conversation description parameter of carrying in the conversation request to SPDF, and request distributes the core-network side terminal.
Step 403, SPDF send ADD (increase) request to C-BGF, the terminal of application core-network side.
Step 404, C-BGF send response and give SPDF, wherein carry the core-network side terminal information of applying for.
Step 406, P-CSCF transmit conversation request, and the media address information in the session characterising parameter is revised as from the address at the core-network side terminal that C-BGF gets access to.
The response message of the conversation request that step 407, P-CSCF receiving step 406 send.
Step 408, P-CSCF send to SPDF and authorize and authentication request, the terminal of request application Access Network side.
Step 409, SPDF send the request of modification to C-BGF, the terminal of request application Access Network side.
Step 410, C-BGF are this session definition media stream service mark according to the indication of SDP (Session Description Protocol Session Description Protocol) information.
Step 411, C-BGF send response message to SPDF, carry the end message of Access Network side and the media stream service mark of C-BGF definition in this response message.
Step 412, SPDF send mandate and Authentication Response is given P-CSCF, wherein carries the end message of Access Network side and the media stream service mark of C-BGF definition.
Step 413, P-CSCF send conversational response to UE, revise the media address parameter in the conversation description parameter, and notice UE sends the access lateral terminal of medium bag to C-BGF, and will carry to UE from the media stream service mark that SPDF obtains.
Signalling exchange is proceeded in step 414, UE and session opposite end, sets up up to session.
Step 415, UE adopt RTP to send media characteristic stream to the access lateral terminal of C-BGF, in media characteristic stream, carry the media stream service mark.
After the access lateral terminal of step 416, C-BGF is received media characteristic stream; Carry out the verification of media stream service mark bag earlier; If the information that needs statistics is then transmitted and write down to verification succeeds, if comprise the flow of this media characteristic stream and transmit data verification failure; Abandon this media characteristic stream, receive scanning attack to prevent present port.
Step 417, when the time point of system configuration arrives, C-BGF adds up and analyzes media flow with different amount and the historical data of transmitting according to the media stream service mark.
The core concept of the business recognition method among second kind of IMS of the present invention is following: set up in the process in the media session business; For this media session definition media stream service mark, distribute Access Network side media address for this media session by AF, by MP the media characteristic stream that receives is carried out verification then by MP; If verification is passed through; Then receive this media characteristic stream and transmit, write down the flow of this media characteristic stream simultaneously and transmit data, when timing statistics arrives according to the Access Network side media address of distributing; MP adds up media flow with different amount and the historical data of transmitting according to the media stream service mark under the control of AF; And statistics reported AF, and by AF statistics is analyzed, make operator further to optimize the Network structure according to this statistic analysis result.See also Fig. 5, this figure is the realization principle flow chart of the business recognition method among second kind of IMS according to the invention, and it mainly comprises step:
Step 500, the UE AF that initiates a session request; Carry the conversation description parameter in this conversation request; Have Media Stream property parameters (attributes such as VoIP, video, messaging service, MSRP) in this conversation description parameter; AF both can be a call conversation control entity, also can be the bearing resource controlled entity.
Step 501, AF receive the conversation request that UE sends, and are media session definition media stream service mark according to the Media Stream property parameters in the conversation description parameter of carrying in the conversation request.
Step 502, AF are sent the media resource request for allocation to MP, carry the media stream service mark of conversation description parameter and self definition in the request, and this request both can be directly to send to MP by AF, and also possibly be AF sends to MP through other control appliance.
After step 503, MP receive the media resource request for allocation,, simultaneously the media stream service mark of AF definition is bound with the Access Network side address that self distributes for this media session distributes Access Network side media address.
Step 504, MP reply the media resource assignment response message to AF, carry the Access Network side media address that MP distributes in the response message.This response message both can be directly to send to AF by MP, and also can be MP through other control appliance send to answers AF.
Step 505, AF are sent conversational response message to UE, wherein carry the media stream service mark of self definition and the Access Network side media address of MP distribution.
Step 506, subsequent session signaling are proceeded to set up up to session alternately.
Step 507, UE utilize Real-time Transport Protocol to send media characteristic and flow to MP according to the Access Network side media address of receiving, wherein carry the media stream service mark of AF definition.
After step 508, MP receive media characteristic stream; Whether the media stream service mark of judging wherein media stream service mark and AF definition meets, if meet, then accepts this media characteristic stream and according to the Access Network side media address of MP distribution it is transmitted; Write down the flow of this media characteristic stream simultaneously and transmit data; Otherwise, abandon this media characteristic stream, receive scanning attack to prevent present port.
Step 509, AF are according to the time point of system configuration; Regularly send out the statistics control messages and give MP; MP adds up media flow with different amount and the historical data of transmitting according to the media stream service mark after receiving this message; And the data that statistics obtains are reported AF, analyze the business of the network of making rational planning for for the data of collecting by AF.
See also Fig. 6, this figure is a kind of flow chart of preferred embodiment of the business recognition method of second kind of IMS according to the invention, and it mainly comprises step:
Step 600, UE send conversation request to P-CSCF, carry the conversation description parameter in the conversation request.
Step 601, P-CSCF receive the conversation request that UE sends, and are media session definition media stream service mark according to the Media Stream property parameters in the conversation description parameter of carrying in the conversation request.
Step 602, P-CSCF send mandate and authentication request according to the conversation description parameter of carrying in the conversation request to SPDF, and request distributes the core-network side terminal.
Step 603, SPDF send ADD (increase) request to C-BGF, the terminal of application core-network side.
Step 604, C-BGF send response and give SPDF, wherein carry the core-network side terminal information of applying for.
Step 605, SPDF send mandate and Authentication Response is given P-CSCF, wherein carries the core-network side terminal information of applying for from C-BGF.
Step 606, P-CSCF transmit conversation request, and the media address information in the session characterising parameter is revised as from the address at the core-network side terminal that C-BGF gets access to.
The response message of the conversation request that step 607, P-CSCF receiving step 606 send.
Step 608, P-CSCF authorize and authentication request to the SPDF transmission, the terminal of request application Access Network side, and in mandate and authentication request, carry the media stream service mark that self defines.
Step 609, SPDF send the request of modification to C-BGF, wherein carry the media stream service mark, the terminal of request application Access Network side.
Step 610, C-BGF send response message to SPDF, carry the end message of Access Network side in this response message, and set up the corresponding relation of Access Network lateral terminal and media stream service mark.
Step 611, SPDF send to P-CSCF and authorize and Authentication Response, wherein carry the end message of Access Network side.
Step 612, P-CSCF transmit conversational response to UE, revise the media address parameter in the conversation description parameter simultaneously, and notice UE sends media characteristic stream to the access lateral terminal of C-BGF, and the media stream service mark of P-CSCF is carried to UE.
Step 613, subsequent session signaling are proceeded to set up up to session alternately.
Step 614, UE send media characteristic stream to the access lateral terminal of C-BGF, wherein carry the media stream service mark.
Step 615, C-BGF are carried out the verification of media stream service label information earlier after receiving media characteristic stream, if verification succeeds then transmit this media characteristic stream to inserting lateral terminal, the flow that writes down this media characteristic stream simultaneously with transmit data; If the verification failure then abandons this media characteristic stream, receive scanning attack to prevent present port.
Step 616, P-CSCF are according to the time point of system configuration; Regularly send out the statistics control messages and give C-BGF; C-BGF adds up media flow with different amount and the historical data of transmitting according to the media stream service mark after receiving this message; And the data that statistics obtains are reported P-CSCF, analyze the business of the network of making rational planning for for the data of collecting by P-CSCF.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. the business recognition method in the IP Multimedia System is characterized in that, comprises step:
After A, application function are received the conversation request that has media characteristic that subscriber equipment sends, send the media resource request for allocation to media platform;
B, media platform receiving media resource allocation request, the media characteristic that carries in the analysis request is its definition media stream service mark, and this media stream service mark is fed back to subscriber equipment through application function;
After C, subscriber equipment are received the feedback of media platform, carry out issuing media platform after the medium assembling according to the media stream service mark that feeds back;
D, media platform carry out verification to the media characteristic stream of the subscriber equipment that receives, send to after the verification succeeds end user device, write down the flow of this media characteristic stream simultaneously and transmit data.
2. the method for claim 1 is characterized in that, also comprises step before the said steps A:
Subscriber equipment sends the conversation request that carries the conversation description parameter to application function, comprises the media characteristic of the media characteristic stream of subscriber equipment desire transmission in the said conversation description parameter.
3. according to claim 1 or claim 2 method; It is characterized in that, among the said step D, if the media characteristic that the media platform verification receives stream does not meet with the media business mark that self defines; Then abandon this media characteristic stream, receive scanning attack to prevent present port.
4. the method for claim 1 is characterized in that, also comprises step behind the said step D:
When preset timing statistics arrived, media platform was added up and is analyzed with the historical data of transmitting the medium flow of different media characteristic streams according to the media stream service mark.
5. the method for claim 1 is characterized in that, said application function is call conversation control entity or bearing resource controlled entity.
6. the method for claim 1; It is characterized in that; Among the said step B; Media platform sends to application function through the media resource assignment response message with the media stream service mark of definition and the Access Network side media address of distribution, through conversational response message this media stream service mark and Access Network side media address is fed back to subscriber equipment by application function then.
7. the business recognition method in the IP Multimedia System is characterized in that, comprises step:
After a, application function are received the conversation request that has media characteristic that subscriber equipment sends; The media characteristic that carries in the analysis request; For its definition media stream service mark, send the media resource request for allocation that carries this media stream service mark to media platform then;
B, media platform receiving media resource allocation request feed back to application function after the media stream service mark binding with resource allocation information and application function distribution, feed back to subscriber equipment by application function;
After c, subscriber equipment are received the feedback of media platform, carry out issuing media platform after the medium assembling according to the media stream service mark that feeds back;
D, media platform carry out verification to the media characteristic stream of the subscriber equipment that receives, send to after the verification succeeds end user device, write down the flow of this media characteristic stream simultaneously and transmit data.
8. method as claimed in claim 7 is characterized in that, also comprises step before the said step a:
Subscriber equipment sends the conversation request that carries the conversation description parameter to application function, comprises the media characteristic of the media characteristic stream of subscriber equipment desire transmission in the said conversation description parameter.
9. like claim 7 or 8 described methods; It is characterized in that, in the said steps d, if the media characteristic that the media platform verification receives stream does not meet with the media business mark that application function defines; Then abandon this media characteristic stream, receive scanning attack to prevent present port.
10. method as claimed in claim 7 is characterized in that, said application function is call conversation control entity or bearing resource controlled entity.
11. method as claimed in claim 7; It is characterized in that; Among the said step b; Media platform sends to application function through the media resource assignment response message with resource allocation information, and application function feeds back to subscriber equipment through conversational response message with the media stream service mark of this resource allocation information and binding thereof.
12. method as claimed in claim 7 is characterized in that, also comprises step after the said steps d:
When preset timing statistics arrives; Media platform is added up with the historical data of transmitting the medium flow of different media characteristic streams according to the media stream service mark under the control of application function; Then statistics is reported application function, statistics is analyzed by application function.
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| US10171518B2 (en) | 2013-10-15 | 2019-01-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Performing an action on certain media streams in a multimedia communications network |
| CN106793005B (en) * | 2016-11-14 | 2020-05-12 | 深圳市唯传科技有限公司 | Roaming communication method and system of Internet of things equipment based on LoRa |
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| EP1619853A1 (en) * | 2004-07-21 | 2006-01-25 | Siemens Mobile Communications S.p.A. | RTSP proxy extended to detect streaming session events and report to valued streaming applications the notified ones |
| CN101026616A (en) * | 2006-02-18 | 2007-08-29 | 华为技术有限公司 | Multimedia subsystem based interactive media session establishing system and method |
| CN101202749A (en) * | 2007-11-16 | 2008-06-18 | 华为技术有限公司 | Method, system and device for processing medium stream request in SIP network |
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| EP1619853A1 (en) * | 2004-07-21 | 2006-01-25 | Siemens Mobile Communications S.p.A. | RTSP proxy extended to detect streaming session events and report to valued streaming applications the notified ones |
| CN101026616A (en) * | 2006-02-18 | 2007-08-29 | 华为技术有限公司 | Multimedia subsystem based interactive media session establishing system and method |
| CN101202749A (en) * | 2007-11-16 | 2008-06-18 | 华为技术有限公司 | Method, system and device for processing medium stream request in SIP network |
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