CN101141678A - IMS session processing method and system - Google Patents
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Abstract
The present invention relates to a processing method of the IMS conversation, which comprises that step 11, whether the registered information of a called party exists is estimated by a calling side S-CSCF, if the registered information of a called party exists, step 12 is executed, otherwise, the S-CSCF analyzes the destination address according to the called party PUI, to retransmit the Invite request to the relevant I-CSCF, and the I-CSCF processes the Invite request according to the 3GPP standard conversation flow; step 12, the S-CSCF checks the state of the called party PUI and the signed contract information, and processes the called party PUI and the signed contract information. The present invention expands the S-CSCF function in a certain grade on the basis of the 3GPP IMS conversation flow, optimizes the IMS conversation processing flow, to reduce the unnecessary signaling interaction during the IMS intraoffice conversation, effectively decreases the signaling flow and the processing load of the equipment, and advances the service quality.
Description
Technical field
The present invention relates to the IMS field, relate in particular to a kind of IMS conversation processing method and system.
Background technology
IMS (IP Multimedia Subsystem, IP Multimedia System) by 3GPP (3rd GenerationPartnership Project, third generation partner program) in its standard series R5, proposes, be one and provide the subsystem of IP multimedia service based on PS (Packet Switching, packet switching) territory.The IMS system configuration is divided into operation layer as shown in Figure 1, core layer and Access Layer.Operation layer is made up of various application servers; Core layer is by agent conversation control function (P-CSCF), serving session control function (S-CSCF), inquiry session controlled function (I-CSCF), home subscriber server (HSS), Subscription Locator Function (SLF), Breakout Gateway Control Function (BGCF), MGCF (MGCF), IMS media gateway (IMS-MGW), Multimedia resource function controller (MRFC) (MRFC), Multimedia resource function processor (MRFP) network elements such as (MRFP) is formed, and Access Layer is by strategy decisive function (PDF), Gateway GPRS Support Node (GGSN), Serving GPRS Support Node compositions such as (SGSN).
Three kinds of User Status are arranged in the IMS system:
Login state (registered state): the user successfully registers, and network has distributed a S-CSCF to the user.
Exit state (not registered state): the user does not register, and network does not distribute S-CSCF to the user.
Unregistered state (unregistered state): in both cases, the user is in unregistered state.1) user's unregistered state business of having contracted, when the user during for exit state as a registration that end call is carried out, can with user from exit state change into unregistered state among the HSS this moment, is S-CSCF of user's assignment simultaneously, and this S-CSCF can be from HSS download user relevant information; When 2) user initiated to nullify, HSS kept the S-CSCF name of user's registration, did not remove relevant user information on the S-CSCF simultaneously, and HSS and S-CSCF just change into unregistered state with User Status from login state.
In addition, in the IMS system, the unregistered state business refers to and user log off state or the relevant business of unregistered state, as calling transfer class business etc.
As Fig. 2-shown in Figure 4,3GPP TS24.228 " Signalling flows for the IP multimedia callcontrol based on SIP and SDP; Stage 3 " defined the session flow process of calling out different user.Here describe this programme and whether to need to carry out topology hiding irrelevant according to the scene of not carrying out topology hiding.
Fig. 2 is time call registration user's a session flow process (S-CSCF is to the S-CSCF part), comprising:
Step 21, Calling Side S-CSCF# 1 receives initial Invite request;
Step 22, S-CSCF#1 returns 100trying (in the trial) message, and the re-transmission of Invite message is responsible in expression by S-CSCF#1;
Step 24, the I-CSCF# 2 of S-CSCF#1 in called subscriber's home network sends Invite message;
Step 26, I-CSCF# 2 sends position enquiring request message (LIR) to HSS;
Step 27, HSS sends position enquiring response message (LIA) to I-CSCF# 2;
Step 28, I-CSCF#2 sends Invite message to callee side S-CSCF#2;
Step 211, S-CSCF#2 sends Invite message to callee side;
Step 212, S-vCSCF#2 receives 100trying message, the re-transmission of Invite message is responsible in expression by next node;
Step 213-step 228, the calling and called user finishes media negotiation, and network side is finished resource reservation simultaneously;
Step 229-step 238, called subscriber's ring;
Step 239-step 245, called subscriber's off-hook, both sides set up conversation.
Fig. 3 calls out an exit state or unregistered state, and the user's of the unregistered state business of having contracted simultaneously session flow chart comprises:
Step 31, Calling Side S-CSCF# 1 receives initial Invite request;
Step 34, the I-CSCF# 2 of S-CSCF#1 in called subscriber's home network sends Invite message;
Step 36, I-CSCF# 2 sends position enquiring request message (LIR) to HSS;
Step 37, HSS sends position enquiring response message (LIA) to I-CSCF# 2;
Step 38, I-CSCF#2 selects callee side S-CSCF#2;
Step 310, S-CSCF# 2 returns 100trying message to I-CSCF# 2;
Step 311, callee side S-CSCF#2 is to HSS send server allocation request message (SAR);
Step 312, HSS distributes response message (SAA) to callee side S-CSCF#2 send server;
Step 314, callee side S-CSCF#2 carries out follow-up flow process.
Annotate:, can omit step 311,312 if preserved user related information when being in unregistered state (be user) on the S-CSCF# 2.
Fig. 4 is the flow process of calling out the user of an exit state or the unregistered state and the unregistered state business of not contracting, and comprising:
Step 41, Calling Side S-CSCF# 1 receives initial Invite request;
Step 44, the I-CSCF# 2 of S-CSCF#1 in called subscriber's home network sends Invite message;
Step 46, I-CSCF# 2 sends position enquiring request message (LIR) to HSS;
Step 47, HSS sends position enquiring response message (LIA) to I-CSCF# 2;
Step 49, S-CSCF#1 sends the ACK acknowledge message to I-CSCF;
Step 410, S-CSCF# 1 transmits 404 message to Calling Side P-CSCF;
Among Fig. 2-Fig. 4 3GPP IMS call out the session flow process of different user can be with Fig. 5 description of summarizing:
Step 501, originating S-CSCF are received initial Invite request;
Step 502, S-CSCF call service logic that the calling subscriber contracts set up session (as, whether need to be triggered to corresponding AS);
Step 503, S-CSCF judges whether called PUI (public user identity) is SIP URI (SIP unified resource identifier), if, execution in step 504, if not, execution in step 505;
Step 504, S-CSCF carries out the destination address analysis according to called PUI, and the Invite request is transmitted to corresponding I-CSCF, execution in step 507;
Step 505 is carried out number to Enum (telephone number mapping) server and is resolved, and whether corresponding SIP URI is arranged, if, execution in step 506, if not, execution in step 523;
Step 506 replaces with corresponding SIP URI, execution in step 504 with Tel URI (phone URL(uniform resource locator));
Step 507, I-CSCF initiates customer location query requests (LIR) to HSS;
Step 508, HSS checks PUI state and related service information, according to PUI state and related service information, corresponding execution in step 509,510,511;
Step 509, if PUI is a login state, or unregistered state but the business of unregistered state is arranged, execution in step 512;
Step 510 if PUI is an exit state, but has the business of unregistered state, execution in step 515;
Step 511 if PUI nullifies or unregistered state, and does not have the business of unregistered state, execution in step 520;
Step 512, HSS returns the S-CSCF name of being preserved in the query response message of position;
Step 513, I-CSCF selects S-CSCF, and request is transmitted to S-CSCF;
Step 514, callee side S-CSCF calls the service logic that the called subscriber contracts and sets up session;
Step 515, HSS will check whether this IMS subscription has at least a PUI to distribute S-CSCF name, if, execution in step 516, otherwise execution in step 517;
Step 516, HSS returns S-CSCF name in the query response message of position, execution in step 518;
Step 517, HSS returns the S-CSCF ability information or selects a S-CSCF, execution in step 518 arbitrarily by I-CSCF in the query response message of position;
Step 518, I-CSCF selects S-CSCF, and request is transmitted to S-CSCF;
Step 519, callee side S-CSCF obtains user signing contract information to HSS send server request for allocation (SAR), execution in step 514;
Step 520, HSS Experimental-Result-Code in the LIA response is set to DIAMETER_ERROR_IDENTITY_NOT_REGISTERED;
Step 521, I-CSCF returns failed message to Calling Side S-CSCF, as 404 message;
Step 522, Calling Side S-CSCF is to P-CSCF retransmission failure message, as 404 message;
Step 523 is handed to BGCF with the Invite request and is carried out subsequent treatment.
In the IMS session flow process of above-mentioned 3GPP definition, for the situation of IMS intra-office session, promptly Calling Side S-CSCF has preserved under the situation of called user information simultaneously, exists unnecessary signaling interaction.As, when calling out a registered user, Calling Side S-CSCF carries out after the corresponding service processing according to calling subscriber's CAMEL-Subscription-Information, the Invite request is transmitted to I-CSCF, learn that the called subscriber is registered in Calling Side S-CSCF simultaneously behind the HSS of I-CSCF inquiry afterwards, I-CSCF returns to Calling Side S-CSCF again with the Invite request, has so just caused unnecessary signaling process.Some other call scenario also exists such problem.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of IMS conversation processing method and system, its purpose is that it is mutual to reduce unnecessary messages, reduces the device processes load, conserve bandwidth, and reduce the session processing delay, promote quality of service.
The invention provides a kind of IMS conversation processing method, comprising:
Step 11, Calling Side S-CSCF judges whether called subscriber's log-on message, if, execution in step 12, otherwise S-CSCF carries out the destination address analysis according to called PUI, the Invite request is transmitted to corresponding I-CSCF, and I-CSCF is according to 3GPP standard session flow processing;
Step 12, S-CSCF checks called PUI state and business information, and handles.
Also comprise step 10 before the step 11, Calling Side S-CSCF judges that called PUI destination address is whether in this S-CSCF allows the territory of registration, if execution in step 11, otherwise, S-CSCF carries out the destination address analysis according to called PUI, the Invite request is transmitted to corresponding I-CSCF, and I-CSCF is according to 3GPP standard session flow processing.
Step 12 comprises:
Step 121, if called PUI is a login state, or unregistered state but the business of unregistered state is arranged, then execution in step 122; If called PUI is a unregistered state, and do not have the business of unregistered state, then execution in step 123;
Step 122, S-CSCF calls the service logic that the called subscriber contracts and sets up session;
Step 123, S-CSCF returns failed message to P-CSCF.
Step 122, when S-CSCF called service logic that the called subscriber contracts and sets up session, Via header field and Record-Route header field added two S-CSCF addresses respectively in Invite message; After S-CSCF receives response message, learn that according to two S-CSCF addresses in the Via header field in the response message this is the situation of intra-office session, carry out callee side and Calling Side session respectively and handle.
Also comprise before the step 11:
Step 501, Calling Side S-CSCF receives initial request message;
Step 502 is called the service logic that the calling subscriber contracts and is set up session;
Step 503 judges whether called PUI is SIP URI, if, execution in step 11, otherwise execution in step 504;
Step 504 is carried out number to the Enum server and is resolved, and judges whether corresponding SIP URI, if execution in step 505 is carried out subsequent treatment otherwise BGCF is handed in the Invite request;
Step 505 replaces with corresponding SIP URI, execution in step 11 with Tel URI.
Described failed message is 404 message.
The invention provides a kind of IMS session processing system, this system comprises S-CSCF, I-CSCF, and S-CSCF also is used for:
Judge whether called subscriber's log-on message; If called subscriber's log-on message is arranged, S-CSCF checks called PUI state and business information, and handles; If there is not called subscriber's log-on message, S-CSCF carries out the destination address analysis according to called PUI, and the Invite request is transmitted to corresponding I-CSCF, and I-CSCF is according to 3GPP standard session flow processing.
S-CSCF is used to also to judge that called PUI destination address is whether in this S-CSCF allows the territory of registration.
After S-CSCF checked called PUI state and business information, the processing of being carried out comprised:
If called PUI is a login state, or unregistered state but the business of unregistered state is arranged, then S-CSCF calls the service logic that the called subscriber contracts and sets up session;
If called PUI is a unregistered state, and do not have the business of unregistered state, then S-CSCF returns failed message to P-CSCF.
When S-CSCF called service logic that the called subscriber contracts and sets up session, Via header field and Record-Route header field added two S-CSCF addresses respectively in Invite message; After S-CSCF receives response message, learn that according to two S-CSCF addresses in the Via header field in the response message this is the situation of intra-office session, carry out callee side and Calling Side session respectively and handle.
The present invention carries out certain expansion to the S-CSCF function on the basis of 3GPP IMS session flow process, and then IMS session handling process is optimized.The present invention can effectively reduce unnecessary signaling traffic and device processes load under the scene of intra-office session, save Internet resources such as bandwidth, and reduce the session processing delay, promotes quality of service.
Description of drawings
Fig. 1 is a 3GPP IMS system construction drawing;
Fig. 2 is the session flow process (S-CSCF is to the S-CSCF part) of time call registration user in the prior art;
Fig. 3 is for calling out an exit state or unregistered state in the prior art but the user's of the unregistered state business of having contracted session flow chart;
Fig. 4 is the flow process of calling out the user of an exit state or the unregistered state and the unregistered state business of not contracting in the prior art;
Fig. 5 is the handling process after S-CSCF in the prior art the receives initial Invite request;
Fig. 6 is a session handling process provided by the invention.
Embodiment
The present invention under the feasible scene for the intra-office session, can effectively reduce unnecessary signaling traffic by the session flow process of 3GPP TS23.228 definition is expanded, and saves Internet resources such as bandwidth.At first the IMS intra-office session that defines among the present invention is described below:
The session of IMS intra-office, the IMS session under three kinds of situations below this programme middle finger:
1) the calling and called user is a login state, is registered in simultaneously on the same S-CSCF;
2) calling subscriber is a login state, and the called subscriber is unregistered state but the business of the unregistered state of having contracted, and called party data is retained on the S-CSCF of calling subscriber's registration;
3) calling subscriber is a login state, and the called subscriber is the unregistered state business of signatory unregistered state simultaneously, and called party data is retained on the S-CSCF of calling subscriber's registration.
Situation for preceding two kinds of intra-office sessions, in the session flow process of 3GPP definition, after Calling Side S-CSCF receives initial Invite request, can request be transmitted to corresponding I-CSCF (step 24 among Fig. 2 according to called PUI, step 34 among Fig. 3), initiate customer location inquiry-LIR/LIA (step 26/27 among Fig. 2 by I-CSCF to HSS, step 36/37 among Fig. 3), because calling and called user profile is kept on the same S-CSCF, I-CSCF can be according to the LIR/LIA Query Result, the Invite request is gone back to again to originating S-CSCF (step 28 among Fig. 2, step 39 among Fig. 3).Situation for these two kinds of intra-office sessions, processing forward through a series of Invite message, and after the LIR/LIA signaling process, the S-CSCF of Calling Side has been got back in the Invite request again, therefore these signaling process processes (step 24-29 among Fig. 2, the step 34-310 among Fig. 3) are unnecessary.Equally, also there is no need through I-CSCF for follow-up 183,180 among Fig. 2,200OK message (to replying of Invite message).
The situation of the third intra-office session, the business of unregistered state does not keep user's related data, and User Status is updated to unregistered state when S-CSCF can be arranged on user log off although the called subscriber contracts.In the session flow process of 3GPP definition, situation for this intra-office session, after Calling Side S-CSCF receives initial Invite request, can request be transmitted to corresponding I-CSCF (step 44 among Fig. 4) according to called PUI, initiate customer location inquiry-LIR/LIA (step 46/47 among Fig. 4) by I-CSCF to HSS, because called PUI is a unregistered state, the business of signatory unregistered state simultaneously, HSS can be set to DIAMETER_ERROR_IDENTITY_NOT_REGISTERED by Experimental-Result-Code in the LIA response, I-CSCF responds according to LIA afterwards, S-CSCF returns failed message to Calling Side, as 404 message (step 48 among Fig. 4), originating S-CSCF is given Calling Side P-CSCF with this forwards.And in fact, situation for this intra-office session, after Calling Side S-CSCF receives the Invite request, can be through the called party data of inquiry self preservation, learn that the called subscriber is a unregistered state, the business of signatory unregistered state simultaneously, S-CSCF can directly return failed message to P-CSCF like this, as 404 message, and need not to select I-CSCF according to called PUI again, after HSS initiates the LIR/LIA inquiry, return the failure Indication message through I-CSCF by I-CSCF, promptly for the situation of the third intra-office session, the step 44-49 among Fig. 4 is unnecessary.
The present invention expands at the call handling process of S-CSCF, and after S-CSCF received the Invite request, handling process was as follows:
Step 101. is called the service logic that the calling subscriber contracts and is set up session, as contacts corresponding AS etc.;
Step 102. is judged the destination address type,
-if SIP is URI, directly carry out step 104;
-otherwise continue step 103;
Step 103. is carried out the number parsing to the Enum server,
If there is corresponding SIP URI in-the Enum server, then S-CSCF transfers the destination address in the Invite request message to corresponding SIP URI, execution in step 104;
-otherwise then S-CSCF is transmitted to corresponding BGCF with the Invite request, carries out subsequent treatment by BGCF;
Step 104. is carried out the destination address analysis, judges destination address whether in this S-CSCF allows the territory of registration,
If-destination address then continues step 105 in S-CSCF allows the territory of registration;
-otherwise S-CSCF sends to corresponding I-CSCF with request and does further processing;
Annotate: in the IMS system, will be routed in the home network according to domain name when the user registers, S-CSCF goes up and will only can register the user in the some territories that belong to limited like this, that is to say the registration that allows these special domains user according to network configuration S-CSCF.
Whether step 105.S-CSCF inquiry preserves called user information (called subscriber can be registration or unregistered state):
If-preserving called user information, S-CSCF checks called PUI state and related service information,
If-PUI is a login state, or unregistered state but the business of unregistered state is arranged, S-CSCF directly calls the service logic that the called subscriber contracts and sets up session: S-CSCF is when callee side P-CSCF or AS send the Invite request, and Via header field and Record-Route header field add two S-CSCF addresses respectively in Invite message.When S-CSCF receives follow-up response message, as 183,180, during 2000K (to replying of Invite message), learn that according to two S-CSCF addresses in the Via header field in the response message this is the situation of intra-office session, carry out callee side and Calling Side session respectively and handle.This programme does not influence the processing of S-CSCF to subsequent request message.
If-PUI is a unregistered state, and do not have the business of unregistered state, S-CSCF directly returns 404 message to P-CSCF;
-otherwise S-CSCF is forwarded to corresponding I-CSCF according to called subscriber's destination address with request, is for further processing according to normal process.
Idiographic flow comprises as shown in Figure 6:
Step 602 is called the service logic that the calling subscriber contracts and is set up session, as contacts corresponding AS etc.;
Step 604 is judged destination address whether in this S-CSCF allows the territory of registration, if execution in step 607, otherwise execution in step 613;
Step 605 is carried out number to the Enum server and is resolved, there there corresponding SIP URI? if, execution in step 606, otherwise execution in step 615;
Step 606 replaces with corresponding SIP URI, execution in step 604 with Tel URI;
Does step 607 have called subscriber's log-on message (registration/unregistered state)? if, execution in step 608, otherwise execution in step 613;
Step 610 if PUI is a unregistered state, and does not have the business of unregistered state, and then execution in step 612;
Step 615 is handed to BGCF with the Invite request and is carried out subsequent treatment.
Session handling process provided by the invention, situation at foregoing three kinds of intra-office sessions, after Calling Side S-CSCF receives initial Invite request, Calling Side S-CSCF knows that by the inquiry its data it has preserved called user information, and then directly handle accordingly, as call suitable service logic, or return failed message etc., and then can reduce in original flow process shown in Figure 2 24-29,214-215,230-231,240-241 totally 12 message to P-CSCF; Reduce totally 6 message (do not comprise among Fig. 3 follow-up possible 183,180 etc. message) of 34-37,39-310 in original flow process shown in Figure 3; Reduce in original flow process shown in Figure 4 44-49 totally 6 message (called be the situation of unregistered state).
The bright session flow process that provides of we can reduce unnecessary signaling interaction under the intra-office session context, saves resources such as port and bandwidth.Influence for other non-intra-office sessions is to have introduced step 604 and 607 two deterministic processes, can not cause tangible influence to session establishment time delay etc.
Session flow process provided by the invention has only been carried out certain expansion to S-CSCF, and other IMS network equipments are not required, and does not influence and does not support intercommunication between this optimization session flow sheet equipment.
Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite the spirit and scope of the present invention of claims.Therefore scope of the present invention is not limited in above explanation, but determine by the scope of claims.
Claims (10)
1. an IMS conversation processing method is characterized in that, comprising:
Step 11, Calling Side S-CSCF judges whether called subscriber's log-on message, if, execution in step 12, otherwise S-CSCF carries out the destination address analysis according to called PUI, the Invite request is transmitted to corresponding I-CSCF, and I-CSCF is according to 3GPP standard session flow processing;
Step 12, S-CSCF checks called PUI state and business information, and handles.
2. IMS conversation processing method as claimed in claim 1, it is characterized in that, also comprise step 10 before the step 11, Calling Side S-CSCF judges that called PUI destination address is whether in this S-CSCF allows the territory of registration, if execution in step 11, otherwise S-CSCF carries out the destination address analysis according to called PUI, the Invite request is transmitted to corresponding I-CSCF, and I-CSCF is according to 3GPP standard session flow processing.
3. IMS conversation processing method as claimed in claim 1 or 2 is characterized in that step 12 comprises:
Step 121, if called PUI is a login state, or unregistered state but the business of unregistered state is arranged, then execution in step 122; If called PUI is a unregistered state, and do not have the business of unregistered state, then execution in step 123;
Step 122, S-CSCF calls the service logic that the called subscriber contracts and sets up session;
Step 123, S-CSCF returns failed message to P-CSCF.
4. IMS conversation processing method as claimed in claim 3, it is characterized in that, step 122, when S-CSCF called service logic that the called subscriber contracts and sets up session, Via header field and Record-Route header field added two S-CSCF addresses respectively in Invite message; After S-CSCF receives response message, learn that according to two S-CSCF addresses in the Via header field in the response message this is the situation of intra-office session, carry out callee side and Calling Side session respectively and handle.
5. IMS conversation processing method as claimed in claim 1 is characterized in that, also comprises before the step 11:
Step 501, Calling Side S-CSCF receives initial request message;
Step 502 is called the service logic that the calling subscriber contracts and is set up session;
Step 503 judges whether called PUI is SIP URI, if, execution in step 11, otherwise execution in step 504;
Step 504 is carried out number to the Enum server and is resolved, and judges whether corresponding SIP URI, if execution in step 505 is carried out subsequent treatment otherwise BGCF is handed in the Invite request;
Step 505 replaces with corresponding SIP URI, execution in step 11 with Tel URI.
6. IMS conversation processing method as claimed in claim 3 is characterized in that, described failed message is 404 message.
7. IMS session processing system, this system comprises S-CSCF, I-CSCF, it is characterized in that, S-CSCF also is used for:
Judge whether called subscriber's log-on message; If called subscriber's log-on message is arranged, S-CSCF checks called PUI state and business information, and handles; If there is not called subscriber's log-on message, S-CSCF carries out the destination address analysis according to called PUI, and the Invite request is transmitted to corresponding I-CSCF, and I-CSCF is according to 3GPP standard session flow processing.
8. IMS session processing system as claimed in claim 7 is characterized in that, S-CSCF is used to also to judge that called PUI destination address is whether in this S-CSCF allows the territory of registration.
9. as claim 7 or 8 described IMS session processing systems, it is characterized in that after S-CSCF checked called PUI state and business information, the processing of being carried out comprised:
If called PUI is a login state, or unregistered state but the business of unregistered state is arranged, then S-CSCF calls the service logic that the called subscriber contracts and sets up session;
If called PUI is a unregistered state, and do not have the business of unregistered state, then S-CSCF returns failed message to P-CSCF.
10. IMS session processing system as claimed in claim 9 is characterized in that, when S-CSCF called service logic that the called subscriber contracts and sets up session, Via header field and Record-Route header field added two S-CSCF addresses respectively in Invite message; After S-CSCF receives response message, learn that according to two S-CSCF addresses in the Via header field in the response message this is the situation of intra-office session, carry out callee side and Calling Side session respectively and handle.
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| CN200710120673A CN100589603C (en) | 2007-08-23 | 2007-08-23 | IMS session processing method and system |
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| CN200710120673A CN100589603C (en) | 2007-08-23 | 2007-08-23 | IMS session processing method and system |
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| CN113543163A (en) * | 2020-04-16 | 2021-10-22 | 中国移动通信集团设计院有限公司 | Method and device for improving Volte end-to-end voice quality |
| CN113543163B (en) * | 2020-04-16 | 2023-08-15 | 中国移动通信集团设计院有限公司 | Method and device for improving Volte end-to-end voice quality |
| CN114979006A (en) * | 2021-10-14 | 2022-08-30 | 中移互联网有限公司 | SIP message processing method and system |
| CN114979006B (en) * | 2021-10-14 | 2023-09-05 | 中移互联网有限公司 | Session Initiation Protocol (SIP) message processing method and system |
| WO2023082676A1 (en) * | 2021-11-10 | 2023-05-19 | 北京挪拉斯坦特芬通信设备有限公司 | Session establishment control method, electronic device, and computer-readable storage medium |
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