CN101257499B - Method for retreating medium state when medium negotiating abnormity - Google Patents
Method for retreating medium state when medium negotiating abnormity Download PDFInfo
- Publication number
- CN101257499B CN101257499B CN2008100937146A CN200810093714A CN101257499B CN 101257499 B CN101257499 B CN 101257499B CN 2008100937146 A CN2008100937146 A CN 2008100937146A CN 200810093714 A CN200810093714 A CN 200810093714A CN 101257499 B CN101257499 B CN 101257499B
- Authority
- CN
- China
- Prior art keywords
- media
- state
- rollback
- media state
- session
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a backing method of the media state when the media negotiate occurs with abnormity, including the following steps: a. negotiating the backing media state types when the net element participating in conversation occurs abnormity; b. selecting the media with the semantic intensity not lower than the backing media state types to negotiate the media state backing before the abnormity occurs. The invention expands the attribute in the SDP used for showing the indication of the media state backing when the media negotiate occurs with abnormity, when the media negotiate occurs with abnormity, the web element participating in conversation selects the backing media state according to the media state types, and returns to the selected media state, thereby ensuring the coherence of the both media state, resuming the communication of the media and has the ability of being compatible with the web element which does not support the SDP attribute expand.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method of retreating medium state when medium negotiating abnormity.
Background technology
In session initiation protocol (SIP), Re-INVITE is the new INVITE request of in an existing dialogue, sending, and can increase, delete Media Stream etc. through Re-INVITE request modified address, port.Using SIP and Session Description Protocol (SDP) to set up in the process of session, there is the situation of Re-INVITE affairs failure.If in the Re-INVITE affairs, accomplished the mutual of media negotiation, will there be dispute in the definite of media state at this moment.
Media negotiation is meant on control channel, accomplishes terminal capability negotiation, principal and subordinate and confirms, opens relative logic channel and sendaisle is taken a series of processes such as table, specifically referring to consensus standard H.245.Media negotiation is in message, to carry Offer (carrying media description provides) through a side to send to the recipient, initiates media negotiation, and the receive direction transmit leg returns the message of carrying Answer (media description is replied) negotiation of message sender initiation is replied.
Shown in Figure 1 for after setting up session, the flow process of Re-INVITE affairs may further comprise the steps:
1: after session was set up, UAC (client) sent Re-INVITE message to UAS (service end), in message, carries Offer, and the media state before initiating Re-INVITE message is decided to be sessionstate1 (media state 1);
2:UAS carries Answer in the Temporary Response (1xx-rel) of article one reliable transmission, accomplish the mutual of this media negotiation, and the media state of this moment is decided to be session state2 (media state 2);
3:UAS sends to UAC and contains 180 semantic message of ring, and 180 message possibly pass through a ring-back tone, a perhaps message notifying UAC on the screen, and there is the request of medium switching in its user of UAS prompting simultaneously;
When the user of 4:UAS refuses this medium handoff request, send other the final response except that 2xx to UAC by UAS, as: 4xx, 5xx and 6xx etc. show this Re-INVITE affairs failure;
5:UAC sends the affirmation of ACK (acknowledge character) as final response to service end UAS.
The subject matter that exists at present is; Media state after the failure of Re-INVITE affairs can't be confirmed, according to RFC 3261, after the failure of Re-INVITE affairs; Media state should return back to the Re-INVITE affairs and initiate state before, i.e. session state1 among Fig. 1; And, confirmed the transition of media state according to after the mutual completion of 3264, media negotiations of RFC, after the failure of Re-INVITE affairs, media state should return back to the session state2 among Fig. 1.
In IETF Draft (draft-ietf-sipping-sip-offeranswer-03), above-mentioned dispute also there is the description of similar above, and points out, this way to solve the problem needs IETF SIP working group further to study.
Take place when unusual at media negotiation; The wish that need return back to the preceding media state of unusual generation is consistent, but can't confirm the media state of rollback, if the network element of participation session understands differently to the media state that needs rollback causes; After the rollback, still can't recover the conversation of medium face.
Summary of the invention
The technical problem that the present invention will solve provides a kind of method of retreating medium state when medium negotiating abnormity, takes place when unusual at media negotiation, and the network element of participating in session can be confirmed the media state of rollback, recovers the conversation of medium face.
For solving the problems of the technologies described above, the method for a kind of retreating medium state when medium negotiating abnormity of the present invention comprises the steps:
A: the network element of participating in session to media negotiation when unusual the media state type of rollback hold consultation;
B: when media negotiation takes place when unusual, participate in the media state type of the network element of session, select the media state rollback before semantic intensity is not less than unusual generation of media negotiation of media state type of this rollback according to rollback.
Further, in step a, the attribute that the media state type of rollback is identified through expansion in SDP is with the negotiation of the media state type of carrying out rollback.
Further, through the attribute that the media state type to rollback of between network element, carrying out the interaction message that media state is consulted, being carried to expand among the SDP identifies, the media state type of rollback is held consultation.
Further; When session is set up; INVITE through between network element, setting up session and the message that this INVITE responds is carried at the attribute that the media state type to rollback expanded among the SDP identifies is held consultation to the media state type of rollback.
Further; After session is set up; Through Re-INVITE message and 1xx-rel message, or PRACK message and 200OK message, or UPDATE message and 200OK message; Be carried at the attribute that the media state type to rollback expanded among the SDP identifies, the media state type of rollback is held consultation.
Further, the media state type comprises: the stable state of unstable state, non-final affirmation and the final stable state of confirming.
Further, unstable state is meant, carries Offer/Answer through the signaling in the INVITE affairs and carries out the mutual media state of setting up, and this media state does not obtain the affirmation of the final response of INVITE affairs as yet.
Further, the stable state of non-final affirmation is meant, before the final affirmation of INVITE affairs, carries Offer/Answer through the signaling of non-INVITE affairs and carries out the mutual media state of setting up.
Further; The final stable state of confirming is meant; Carry Offer/Answer through the signaling in the INVITE affairs and carry out the mutual media state of setting up; And obtain the final response confirmation of the 2xx message of INVITE affairs, or outside the process that the INVITE affairs are carried out, carry Offer/Answer through the signaling of non-INVITE affairs and carry out the media state set up alternately.
Further, in step b, the network element of participation session is selected apart from media negotiation the preceding media state rollback of the unusual generation of media negotiation that the last semantic intensity is not less than the media state type of rollback to take place unusually according to the media state type of rollback.
In sum, the present invention is used for presentation medium and consults when unusual through a kind of attribute of expansion in SDP; The indication of media state rollback, and the media state type of rollback is held consultation when in media consultation process, carrying this extended attribute to unusual take place is when media negotiation taking place when unusual; Participate in the media state type of the network element of session, select the media state of rollback, and return back to the media state of selection separately according to the rollback that consults; Thereby when having guaranteed that media negotiation is unusual; The consistency of both sides' media state has been recovered the conversation of medium faces, and has the compatible ability of not supporting the network element of this SDP attribute expansion.
Description of drawings
The flow chart that Fig. 1 consults for media state;
Fig. 2 is the flow chart of the inventive method;
Fig. 3 is the media state sketch map corresponding with the media state type of the present invention's first example;
Fig. 4 is the signaling process figure of the present invention's second example;
Fig. 5 is the media state sketch map corresponding with the media state type of the present invention's second example.
Embodiment
The present invention combines to carry the characteristics of the SIP signaling of SDP such as Offer/Answer, the media state of its foundation is carried out generic divide, and media state is divided into different media state types.It is emphasized that from the viewpoint of set and see, when the media state of being set up by the SIP signaling is carried out the generic division, can comprise the various media states that possibly exist in the practical application as long as satisfy the union of the media state type after dividing.
Before media negotiation takes place unusually; Each network element during to unusual take place the media state type of rollback hold consultation; Need return back to which media state type when promptly confirming unusual the generation, the media consultation process that this process is set up in (or modification) process through session is carried out.
When unusual generation, each network element is according to the media state of the media state type selecting rollback that consults, and return back to the media state of selection separately.
Describe below in conjunction with the accompanying drawing specific embodiments of the invention:
The media state of in the present embodiment session being set up in the process to be adopted is divided into three kinds of fundamental types; Comprise: ST_NONSTABLE (nonstable session state; Unstable state), ST_NON_FINAL_CFM (non-final confirmed session state; The stable state of non-final affirmation and ST_FINAL_CFM (final confirmed session state, the final stable state of confirming), wherein:
ST_NONSTABLE is defined as: carry Offer/Answer through the signaling in the INVITE affairs and carry out the mutual media state of setting up, see that from time domain this media state does not also obtain the affirmation of the final response of INVITE.
ST_NON_FINAL_CFM is defined as: before the final affirmation of INVITE affairs; Carry Offer/Answer through the signaling of non-INVITE affairs and carry out the mutual media state of confirming; For example the INVITE affairs are carried out in the process, the media state of setting up through UPDATE/200OK.
ST_FINAL_CFM is defined as: carry Offer/Answer through the signaling in the INVITE affairs and carry out the mutual media state of confirming; And the final response confirmation of the 2xx that obtains INVITE; Or outside the INVITE affairs process of carrying out, carry Offer/Answer through the signaling of non-INVITE affairs and carry out the media state set up alternately.
Because ST_FINAL_CFM can replace ST_NONSTABLE and ST_NON_FINAL_CFM; ST_NON_FINAL_CFM can replace ST_NONSTABLE; Therefore, the rollback semanteme of ST_NONSTABLE, ST_NON_FINAL_CFM and three kinds of media state types of ST_FINAL_CFM is tended to become strong by weak successively.
Shown in Figure 2 is the flow chart of the inventive method, and this method comprises following steps:
201: the media state type of rollback takes place when unusual to media negotiation and holds consultation in the network element of participating in session;
Through expanding a kind of media state type of SDP attribute rollbacklevel sign rollback, mutual both sides are indicated the media state type of negotiation.
According among the RFC 4566 to the form a=< attribute>of SDP attribute definition: < value >; The form of the media state type of definition sign rollback is: a=rollbacklevel: < value >, wherein the value of value is chosen as: ST_NONSTABLE, ST_NON_FINAL_CFM, ST_FINAL_CFM.
The type of the media state of rollback is to accomplish through carrying the rollbacklevel attribute in the interaction message of consulting media state between the network element of participating in session at those.Can be when session be set up; INVITE through setting up session carries Offer; In Offer, carry the rollbacklevel attribute; Message to INVITE responds is carried Answer, and in Answer, carry the rollbacklevel attribute and hold consultation, or after the session foundation; Accomplish the negotiation of the media state type of rollback through other signaling of carrying Offer/Answer, as holding consultation through the Re-INVITE signaling of carrying Offer and 1xx-rel signaling, PRACK message and 200OK message, UPDATE message and the 200OK message etc. of carrying Answer.
Carry the media state type of rollback during negotiation through SDP, do not carry in the SIP head (SIPHeader) and be not employed in, advantage is embodied in following two aspects:
The granularity of medium indications is thinner: the content of SDP can be directed against each concrete medium composition, and if in the SIP head, carry, only be session level, promptly only to the interior all medium compositions of session.
Has compatibility: among the RFC 4566 SDP is defined as,, need skips for can not identified attributes (attributes); And do not influence identification to all the other contents of SDP; So through expansion SDP, can have the compatible ability of not supporting the network element of this expansion, promptly have backward compatible ability.
In the media consultation process, when filling in the rollbacklevel attribute, the rollbacklevel that carries among the Answer, its semanteme can not be weaker than the semanteme of the rollbacklevel that carries among the Offer.If carried semantic more weak rollbacklevel among the Answer, then media negotiation provider (Offerer) should think that media negotiation answer party (Answerer) do not support this rollbacklevel attribute.
If media negotiation answer party (Answerer) can not satisfy the requirement of the semanteme that is not weaker than media negotiation provider (Offerer), then can not (MUST NOT) in Answer, carry the rollbacklevel attribute.
Compatible concrete operations:, then represent it and can not support this function if the media negotiation answer party does not carry rollbacklevel in Answer.After unusual the generation; Media negotiation provider (Offerer) can't confirm the media state type of rollback; Because media negotiation answer party (Answerer) does not have clear and definite indication, media negotiation provider this moment (Offerer) can initiate new Offer, through extra signaling; By its understanding, refresh media state to media state.
202: when media negotiation was unusual, each network element of participation session was selected the last, and its semantic intensity is not less than the media state of the media state type of having consulted, and return back to this media state separately.
For ease of describing, the rollbacklevel property value that definition consults is rollbacklevelvalue, in the reality rollbacklevelvalue be ST_NONSTABLE, ST_NON_FINAL_CFM, ST_FINAL_CFM one of them.
When supposing unusual the generation; Needing the media state of the rollback of searching is state; Each network element of then participating in session only need travel through the sequence of media state on time domain; Find the media state of recent satisfied semanteme more than or equal to the semanteme of rollbacklevelvalue, this media state is definite rollback state state.
The media state rollback of the media state type of selecting semantic intensity to be not less than to have consulted; If be because rollbacklevelvalue consults to be ST_NON_FINAL_CFM; And the state before the unusual origination point is ST_FINAL_CFM; As long as return back to the ST_FINAL_CFM state this moment, that is to say because the ST_FINAL_CFM semanteme is stronger than ST_NON_FINAL_CFM, so ST_FINAL_CFM can replace ST_NON_FINAL_CFM.
Below in conjunction with two applying examples further explain the foregoing descriptions; With reference to Fig. 1 and shown in Figure 3, in Fig. 3, the sequence number of this media state of numeral on time shaft below the media state type; 1 corresponding session state 1; 2 corresponding session state 2,1 belong to ST_FINAL_CFM, and 2 belong to ST_NONSTABLE;
A: after session was set up, when promptly being in session state1, UAC sent the Re-INVITE signaling to UAS, in Re-INVITE, carries Offer, carries a=rollbacklevel:ST_FINAL_CFM among the Offer;
B:UAS returns 1xx-rel to UAC, in 1xx-rel, carries Answer, also carries a=rollbacklevel:ST_FINAL_CFM among the Answer;
At this moment, UAC and UAS to media negotiation when unusual the media state type of rollback consult successfully, negotiation result return back to type ST_FINAL_CFM when being unusual, and has accomplished the negotiation of session state 2 simultaneously.
C:UAS sends 180 expression rings (PRACK is the affirmation message to 180, and 200OK is the response of PRACK message);
D:UAS sends failed message (4xx/5xx/6xx one of them failed message) to UAC, and promptly media negotiation takes place unusual;
E:UAC sends the affirmation message (ACK) of failed message;
F: media negotiation takes place when unusual, and promptly after session state 2, UAC and UAS are according to the media state type ST_FINAL_CFM of the rollback that consults; Searching the media state of nearest semanteme more than or equal to ST_FINAL_CFM, can from Fig. 3, see, should be the corresponding media state of empty frame; Be session state 1; It is semantic identical with the media state type that consults that it belongs to the ST_FINAL_CFM type, and therefore, UAC and UAS return back to session state 1 separately.
If the negotiation result of Re-INVITE and 1xx-rel is ST_NONSTABLE; Map 3; Take place when unusual at media negotiation, UAC and UAS search the media state of nearest semanteme more than or equal to ST_NONSTABLE, from Fig. 3, see; Should be session state 2, UAC and UAS return back to session state 2 separately.
Through an applying examples the foregoing description is described below, with reference to Fig. 4 and shown in Figure 5, wherein session state 1 belongs to ST_FINAL_CFM again, and session state 2,3,4,5 all belongs to ST_NONSTABLE;
A: after session was set up, when being in session state 1, UAC sent the Re-INVITE signaling to UAS, in the Re-INVITE signaling, carries Offer, and UAS returns 1xx-rel to UAC, in 1xx-rel, carries Answer, was in session state 2 this moment;
B: after receiving 1xx-rel, UAC sends PRACK to UAS, in PRACK, carries Offer; UAS sends the 200OK to the PRACK response to UAC, in 200OK, carries Answer, is in session state 3 this moment;
C:UAS sends the UPDATE signaling to UAC, in the UPDATE signaling, carries Offer, and UAC returns the 200OK that the UPDATE signaling is replied to UAS, carries Answer among the 200OK, is in session state 4 this moment;
D:UAS sends 180 ALERTING messages to UAC, and UAC returns the PRACK of this 180 ALERTING message to UAS, in PRACK, carries Offer, and UAS sends the 200OK that replys PRACK to UAC, in 200OK, carries Answer, is in session state 5 this moment;
E:UAS sends failed message (failed message that 4xx/5xx/6xx is a type) to UAC, that is, media negotiation takes place unusual;
F:UAC sends the affirmation message (ACK) of failed message to UAS;
G: after media negotiation takes place unusually; When the abnormality processing result of UAC and UAS negotiation is ST_NONSTABLE; Then UAC and UAS search a nearest not semantic media state less than ST_NONSTABLE, are session state 5, and UAC and UAS return back to session state 5 separately.
If the abnormality processing result that UAC and UAS consult is ST_NON_FINAL_CFM; Then UAC and UAS search the media state that a nearest semanteme is not less than ST_NON_FINAL_CFM; Be session state 1, UAC and UAS return back to session state 1 separately.
If the abnormality processing result that UAC and UAS consult is ST_FINAL_CFM, then UAC and UAS search the media state that a nearest semanteme is not less than ST_FINAL_CFM, are sessionstate 1, and UAC and UAS return back to session state 1 separately.
In this example, the INVITE the when negotiation of the media state type of rollback can be set up through session carries Offer, and the message of response INVITE is carried Answer and accomplished; Also can accomplish the negotiation of the media state type of rollback through any media negotiation among the above-mentioned A-D.
Certainly; The present invention also can have other embodiment; Under the situation that does not deviate from spirit of the present invention and essence thereof; Being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1. the method for a retreating medium state when medium negotiating abnormity comprises the steps:
A: the network element of participating in session to media negotiation when unusual the media state type of rollback hold consultation; Wherein, said media state type comprises: the stable state of unstable state, non-final affirmation and the final stable state of confirming;
B: when media negotiation takes place when unusual, participate in the media state type of the network element of session, select the media state rollback before semantic intensity is not less than unusual generation of media negotiation of media state type of this rollback according to rollback; The semantic intensity of the stable state of wherein, unstable state, non-final affirmation and final three kinds of media state types of stable state of confirming is tended to become strong by weak successively;
Wherein, said unstable state is meant, carries Offer/Answer through the signaling in the INVITE affairs and carries out the mutual media state of setting up, and this media state does not obtain the affirmation of the final response of INVITE affairs as yet;
Wherein, the stable state of said non-final affirmation is meant, before the final affirmation of INVITE affairs, carries Offer/Answer through the signaling of non-INVITE affairs and carries out the mutual media state of setting up;
Wherein, The stable state of said final affirmation is meant; Carry Offer/Answer through the signaling in the INVITE affairs and carry out the mutual media state of setting up; And obtain the final response confirmation of the 2xx message of INVITE affairs, or outside the process that the INVITE affairs are carried out, carry Offer/Answer through the signaling of non-INVITE affairs and carry out the media state set up alternately.
2. the method for claim 1 is characterized in that, in step a, the attribute that the media state type of rollback is identified through expansion in SDP is with the negotiation of the media state type of carrying out rollback.
3. method as claimed in claim 2; It is characterized in that; Through between said network element, carrying out the interaction message that media state is consulted, carry the attribute that the said media state type of in SDP, expanding to rollback identifies, the media state type of rollback is held consultation.
4. method as claimed in claim 3; It is characterized in that; When session is set up; Through carrying the attribute that the said media state type of in SDP, expanding to rollback identifies, the media state type of rollback is held consultation at the INVITE of setting up session between network element with to the message that this INVITE responds.
5. method as claimed in claim 3; It is characterized in that, after session is set up, through Re-INVITE message and 1xx-rel message; Or PRACK message and 200OK message; Or UPDATE message and 200OK message, carry the attribute that the said media state type of in SDP, expanding to rollback identifies, the media state type of rollback is held consultation.
6. the method for claim 1; It is characterized in that; In step b; The network element of participation session is selected apart from media negotiation the preceding media state rollback of the unusual generation of media negotiation that the last semantic intensity is not less than the media state type of rollback to take place unusually according to the media state type of rollback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100937146A CN101257499B (en) | 2008-04-16 | 2008-04-16 | Method for retreating medium state when medium negotiating abnormity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100937146A CN101257499B (en) | 2008-04-16 | 2008-04-16 | Method for retreating medium state when medium negotiating abnormity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101257499A CN101257499A (en) | 2008-09-03 |
| CN101257499B true CN101257499B (en) | 2012-06-13 |
Family
ID=39891968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100937146A Active CN101257499B (en) | 2008-04-16 | 2008-04-16 | Method for retreating medium state when medium negotiating abnormity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101257499B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835211B (en) * | 2009-03-12 | 2014-01-01 | 中兴通讯股份有限公司 | Method for rollbacking media status |
| WO2011143804A1 (en) * | 2010-05-17 | 2011-11-24 | 中兴通讯股份有限公司 | Method and system for rolling back media state |
| CN114205337B (en) * | 2021-11-05 | 2024-03-15 | 海能达通信股份有限公司 | Media capability negotiation method, device, equipment and computer readable storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000194624A (en) * | 1998-12-25 | 2000-07-14 | Toshiba Corp | Computer system and communication recovery system |
| CN1834909A (en) * | 2005-03-18 | 2006-09-20 | 上海华为技术有限公司 | Updating method for distance equipment system software |
| CN101123486A (en) * | 2007-09-20 | 2008-02-13 | 哈尔滨工程大学 | Check point migration method under error tolerance mobile computing environment |
-
2008
- 2008-04-16 CN CN2008100937146A patent/CN101257499B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000194624A (en) * | 1998-12-25 | 2000-07-14 | Toshiba Corp | Computer system and communication recovery system |
| CN1834909A (en) * | 2005-03-18 | 2006-09-20 | 上海华为技术有限公司 | Updating method for distance equipment system software |
| CN101123486A (en) * | 2007-09-20 | 2008-02-13 | 哈尔滨工程大学 | Check point migration method under error tolerance mobile computing environment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101257499A (en) | 2008-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2405272C2 (en) | Method and system for sending information of functional capabilities of user equipment in network of internet protocol multimedia subsystem | |
| CN101431737B (en) | Multimedia conversation call control method and application server thereof | |
| US9042378B2 (en) | Method and apparatus for interworking with media fallback | |
| CN102006645B (en) | Multi-session transfer method and call control equipment and service continuity server | |
| CN101884205B (en) | Dynamic initiation of i1-ps signaling in ims centralized services | |
| CN101257499B (en) | Method for retreating medium state when medium negotiating abnormity | |
| CN101026614B (en) | Media type parameter negotiation method | |
| CN101166178B (en) | Session description protocol version negotiation method, system and network entity | |
| CN101453459A (en) | Method and apparatus for media negotiation implementation | |
| CN101217703B (en) | A method realizing online CRBT and color image generation | |
| CN102348291B (en) | Based on session establishing method and the system of dialogue association identification | |
| CN101370292A (en) | Method, apparatus and system for media transfer between terminals | |
| CN101237614A (en) | Method for realizing CRBT service | |
| CN101494648B (en) | Medium transfer method between terminal equipment, and network equipment | |
| CN101448046B (en) | Call-establishing method for realizing single-conversation color ring back tone service | |
| JP2011049687A (en) | Communication network system, sip signal relay method therefor and sip application server | |
| CN101453453A (en) | Method and apparatus for implementing call holding | |
| CN102111386B (en) | Early media implementation method and device | |
| CN101383827A (en) | Method, apparatus and system for media transferring | |
| CN100496049C (en) | Intercommunication method between users' sides in SIP multimedia system | |
| CN101764896A (en) | Method, device and system for adding or removing conference participants in multi-party conference | |
| CN101990267A (en) | Method for implementing multi-party call service continuity | |
| CN102045298B (en) | Consultation method and system of IP multimedia subsystem (IMS) media coding/decoding device | |
| CN101459626B (en) | Message transmission control method for IP multimedia subsystem | |
| CN102187639A (en) | Method and arrangement for improved session setup signaling policing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |