CN1859428A - Method and system for control conversation timer in conversation iniatial protocol network - Google Patents

Method and system for control conversation timer in conversation iniatial protocol network Download PDF

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Publication number
CN1859428A
CN1859428A CN200610066521.2A CN200610066521A CN1859428A CN 1859428 A CN1859428 A CN 1859428A CN 200610066521 A CN200610066521 A CN 200610066521A CN 1859428 A CN1859428 A CN 1859428A
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duration
entity
session timer
session
timer
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CN100486254C (en
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梁亮
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN200610066521.2A priority Critical patent/CN100486254C/en
Publication of CN1859428A publication Critical patent/CN1859428A/en
Priority to PCT/CN2007/000652 priority patent/WO2007109970A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/28—Timers or timing mechanisms used in protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]

Abstract

The present invention discloses controlling session timer method in session initiation protocol (SIP) network, said method used in application service server (AS) and backward transaction user (TU) solid system, said backward TU solid configured having session timer. Said method includes A, said AS determining said session timer duration and transmitting to backward TU solid; B, step A mentioned backward TU solid according to received session timer duration to reconfigure own session timer. The present invention also discloses a system. The present invented method and system can reduce temporary responsive repeating transmission.

Description

The method and system of control Session Timer in a kind of session initial protocol network
Technical field
The present invention relates to session initiation protocol (SIP, Session Initiation Protocol) network technology, the method and system of control Session Timer in particularly a kind of SIP network.
Background technology
SIP is the IP phone signaling protocol that is proposed by the Internet engineering duty group (IETF, Internet Engineering Task Force).As what its name implied, SIP is used for initiation session, and the foundation and the termination of the Multimedia session that can participate in a plurality of participants are controlled, and can dynamically adjust and modification etc. session attribute.Usually, can realize various SIP applied business based on IP Multimedia System (IMS) and Public Switched Telephone Network.In PSTN, SIP uses and is implemented in the application server (AS), and provide various value-added services by mutual between soft switch (soft switch) and the AS to the user, such as: prepayment telephone card business (pre-paid calling card calls), click to dial (click-to-dial) or the like.
In the process of setting up the SIP session, do not produce the situation that termination is replied in order to handle session foundation request (as: invitation INVITE), affairs user (TU, Transaction User) will Session Timer be set for the formal response of the session request of setting up, be commonly referred to timer C (TimerC).Here, described TU refers to be positioned at the protocol layer entity on the transport layer, mainly refers to the SIP layer entity, comprising: User Agent Client (UAC, User Agent Client), subscriber proxy server (UAS, User Agent Server), agency (Proxy) or the like; Wherein, described Proxy comprises: caller outgoing call agency (Caller Outbound Proxy), sip server, back-to-back user agent (B2BUA) or the like, described B2BUA is exactly the AS of current application business usually.Described formal response is often referred to 2XX, 3XX, the 4XX message in the SIP signaling, such as: 200 OK message, 380 message etc.
By present agreement regulation, when TU transmits after session sets up request, will set up client transaction and for this client transaction starts a Timer C, its timing thresholding must be greater than three minutes, and adopt following mechanism to control Timer C.This Timer C is used to receive the formal response that request is set up in session, and when receiving formal response, Timer C will stop timing.When Timer C was overtime, TU must select arbitrary timing thresholding reset Timer C or termination active client affairs.When TU receives Temporary Response, also can select arbitrary timing thresholding reset Timer C or termination active client affairs.Because, allow the TU Timer C that resets, so TU is overtime or receive under the situation of Temporary Response at Timer C, can be based on the life cycle that prolongs the active client affairs when precondition dynamically.Described Temporary Response is often referred to the 1XX message (that is: 101～199 message) in the SIP signaling, such as: 180 rings (Ringing) message, 183 is handled (Processing) message or the like.
But still there are some problems in actual applications in above-mentioned Session Timer Timer C controlling mechanism.Setting up in the process of SIP session, may exist a large amount of TU to transmit Temporary Response.Such as: calling subscriber A to exist successively between the called subscriber B m TU:TU1, TU2 ..., TUn-1, TUn ..., TUm.For AS, each TU of Calling Side is exactly back to the TU entity, and each TU of callee side is exactly a forward direction TU entity, so TUn-1 can be called the back to the TU entity of TUn.TUn in some cases may be owing to will carry out alternately with other entity, such as: as the TU of back-to-back user agent (B2BUA) and soft switch (Soft Switch) alternately to obtain routing iinformation, thereby can not in time transmit session and set up and to ask entity to forward direction TU, also just can not in time return this session set up the corresponding formal response of request give after to TU entity TUn-1; Perhaps, AS is carrying out playback and is collecting the digits, and promptly carries out alternately with the user, and this process may continue considerable time (far above 3 minutes), and at this moment, this AS will return 180 message to begin to charge to avoid originating switch.Discharge Timer C for fear of the back in advance to TU entity TUn-1, TUn must in the minimum timing cycle (promptly three minutes) of Timer C, send Temporary Response to the back to TU entity TUn-1, so that allow this back, to wait for formal response from forward direction TU entity TUn to TU entity TUn-1 replacement Timer C.And if forward direction TU entity TUn still can not in time return formal response, it also will be retransmitted Temporary Response in the minimum timing of Timer C and give the back to TU entity TUn-1 in the cycle, thereby may cause repeatedly the repeating transmission of Temporary Response.
As seen, set up in the process in existing SIP session, can not realize between each TU that the unified of Timer C is provided with, forward direction TU entity can only notify the back to TU entity replacement Timer C by the mechanism that sends Temporary Response, to continue to wait for formal response.To cause thus Temporary Response between each TU repeat send, thereby cause the waste of network bandwidth resources, and influence the processing that other message in the process is set up in the SIP session.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method and system of control Session Timer in a kind of SIP network, make AS set up in the process each back Session Timer on the TU entity and implement unified control the SIP session, with reduce Temporary Response repeat send.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses the method for control Session Timer in a kind of SIP network, this method is applied to comprise: applied business server A S reaches thereafter to the system of affairs user TU entity, and described back is provided with Session Timer to the TU entity; Described AS is with called when setting up session, and this method comprises:
A. described AS determines the duration of described Session Timer and sends to the back to the TU entity;
B. the described back of steps A reconfigures the Session Timer of self by the duration of the Session Timer that receives to the TU entity.
Wherein, it is a plurality of that described back has to the TU entity, comprising: AS connects back to TU entity and back to the TU entity connected back to the TU entity;
Described step B further comprises: it is back to the TU entity that the back duration that sends this Session Timer to the TU entity that this AS connects connects to self, each back sends back to the TU entity that the duration of this Session Timer connects to self after the TU entity is receiving the Session Timer duration, reconfigure the Session Timer of self behind back to the TU entity other that removes that described AS connects respectively by the Session Timer duration that receives separately to the TU entity.
In the steps A, the duration of described transmission Session Timer to the back to the method for TU entity is: send by the duration that carries this Session Timer after returning in the Temporary Response of TU entity.
In the steps A, described method of carrying the duration of Session Timer in Temporary Response is: existing reserved field carries the duration of this Session Timer in the use Temporary Response, perhaps carries the duration of this Session Timer for the new field of this Temporary Response structure.
Wherein, described Temporary Response is the arbitrary message in 101 to 199 message of SIP.
Wherein, further comprised before steps A: the Session Timer duration scope that the caller transmission is supported self is to described AS;
In the steps A, the method for described definite Session Timer duration is: AS chooses a duration wantonly as the current sessions length of timer from the Session Timer duration scope that self receives.
Wherein, the method for described caller transmission Session Timer duration scope is: send by carrying this Session Timer duration scope in the session foundation request of mailing to AS in caller.
Wherein, described method of carrying Session Timer duration scope in session foundation request is: existing reserved field carried this Session Timer duration scope during the use session was set up and asked, and perhaps constructed new field for this session foundation request and carried this Session Timer duration scope.
Wherein, described Session Timer is timer Timer C.
Wherein, described back to the TU entity for acting on behalf of Proxy or sip server or User Agent Client/subscriber proxy server UAC/UAS.
The invention also discloses the system of control Session Timer in a kind of SIP network, this system comprises: AS reaches thereafter to the TU entity, and described back is provided with Session Timer to the TU entity; Described AS comprises duration the unit is set, and described back comprises the duration reset cell to the TU entity;
Described duration is provided with the unit, is used for determining the duration of Session Timer and exporting described duration reset cell to;
Described duration reset cell is used for from described duration the unit being set and receives the duration of described Session Timer and reset behind self place to the Session Timer of TU entity by the duration of this Session Timer.
Wherein, described duration is provided with the unit and comprises:
The duration determination module is used for determining the duration of Session Timer and exporting described duration output module to;
The duration output module is used to receive from the Session Timer duration of duration determination module and exports described duration reset cell to.
Wherein, described duration reset cell comprises:
The duration input module is used for from described duration the unit being set and receives the duration of described Session Timer and be sent to the duration configuration module;
The duration configuration module is used for by self described back Session Timer to the TU entity of resetting from the duration of the Session Timer of described duration input module.
Wherein, it is a plurality of that described back has to the TU entity, comprising: AS connects back to TU entity and back to the TU entity connected back to the TU entity; Each back comprises a duration reset cell to the TU entity; Described duration reset cell further comprises:
The duration forwarding module, be used for receiving the duration of described Session Timer and being forwarded to other back to the duration input module of TU entity from described duration input module, this other back to the TU entity for behind this duration forwarding module place to the TU entity connected back to the TU entity.
Wherein, described back to the TU entity is: Proxy or sip server or UAC/UAS.
By such scheme as can be seen, key of the present invention is: in AS and the called process of setting up session, AS is to the back duration that returns the Session Timer of self determining to the TU entity of Calling Side, make each back to the TU entity by reset separately Session Timer of this duration, to realize that AS is to the unified control of each back to the Session Timer of TU entity.
Therefore, the method and system of control Session Timer in the SIP network provided by the present invention, can make AS unify each back of replacement Session Timer according to the situation that current sessions is set up to the TU entity, avoid the back to discharge Session Timer in advance to the TU entity, significantly reduce Temporary Response between each TU entity repeat send, effectively utilize limited bandwidth resources, thereby improve the quality of service of SIP network.
Description of drawings
Fig. 1 is the inventive method one preferred embodiment handling process schematic diagram;
Fig. 2 forms structural representation for system of the present invention one preferred embodiment.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The invention discloses the method for control Session Timer in a kind of SIP network, this method is applied to comprise: AS and the back system to the TU entity that is provided with Session Timer; Its main design philosophy is: when AS, is determining the duration of described Session Timer and sending to the back to the TU entity when setting up session with called; This back reconfigures the Session Timer of self again by the duration of the Session Timer that receives to the TU entity.
Wherein, may have one or more TU entities between from AS to the caller, it is the back to the TU entity of AS that these TU entities all can be described as, and comprising: AS connects back to TU entity and back to the TU entity connected back to the TU entity.In such cases, AS is when returning the duration of Session Timer, at first this Session Timer duration is returned to back that this AS connects to the TU entity, this back can be transmitted to the Session Timer duration that receives back to the TU entity that self connects to the TU entity then, after this, it is back to the TU entity that each back duration that all can send this Session Timer after the TU entity is receiving the Session Timer duration connects to self, and each back also reconfigures the Session Timer of self respectively by the Session Timer duration that receives separately to the TU entity.Back of the present invention can be agency (Proxy) or sip server or User Agent Client/subscriber proxy server (UAC/UAS) to the TU entity.
Here,, can carry the duration of this Session Timer and realize sending returning to this AS or back when sending the duration of Session Timer to the TU entity AS or back in the Temporary Response of TU entity.Described Temporary Response refers to the 1XX message of SIP, and just the arbitrary message in 101 to 199 message (also being represented as 101～199 message) adopts 180 or 183 message usually.
Fig. 1 is the inventive method one preferred embodiment handling process schematic diagram.In the present embodiment, Session Timer is Timer C, and at the Calling Side of AS, the back comprises to the TU entity: sip server, caller outgoing call agency (Caller Outbound Proxy) and as the calling terminal of UAC.As shown in Figure 1, concrete treatment step comprises:
Step 101: calling terminal sends session to caller outgoing call agency and sets up request, and here, this session request of setting up is carried by invitation (INVITE) message of SIP.
Step 102～step 103: caller outgoing call agency sends INVITE to sip server, and this sip server is forwarded to this INVITE the AS of current business, i.e. B2BUA again.
Wherein, after calling terminal, caller outgoing call agency, sip server and AS receive INVITE, all return 100 and attempt (Trying) message, shown to receive this INVITE and present.
Step 104:AS sends INVITE to terminal called; Terminal called returns 100 Trying message.
Step 105: when circuit was connected, this terminal called also returned 180 rings (Ringing) message to AS, and this 180 Ringing message is exactly a kind of Temporary Response.
Step 106:AS this moment can be determined the duration of Timer C according to the situation that current sessions is set up, and carries the duration of this Timer C in the current 180 Ringing message that will return to sip server.Then, sip server, caller outgoing call agency afterwards transmits this 180 Ringing message to the TU entity to what connect separately successively when receiving 180 Ringing message.Each back is to the TU entity, that is: calling terminal, caller outgoing call agency, sip server are therefrom resolved the duration that obtains Timer C after receiving 180 Ringing message, and reconfigure the Timer C of self by this duration.
Certainly; AS also can carry the duration of Session Timer by other Temporary Response; such as: 183Processing message or the like, the present invention does not limit for specifically which Temporary Response carrying the Session Timer duration by, but all within protection scope of the present invention.
Here, it is the back to the TU entity of AS connection that sip server can be called, and caller outgoing call agency can be described as be sip server connect back to the TU entity, calling terminal just can be described as be caller outgoing call agency connect back to the TU entity, that is: caller outgoing call agency and calling terminal be the back to the TU entity be connected back to the TU entity.The duration of described Timer C also can be expressed as transmission duration (TE, Transaction Expires), and this TE will be configured to bigger value usually, such as: 3000 seconds, can guarantee that like this each back has enough durations to receive formal response to the TU entity.
Step 107: when terminal called is answered, terminal called returns formal response 200 OK message to AS, AS returns this 200 OK message by sip server to caller outgoing call agency again, caller outgoing call agency returns this 200 OK message to calling terminal again, sip server, caller outgoing call agency and calling terminal are after receiving these formal response 200 OK message, Timer C separately will be released, and set up process to finish whole session.
Because, in step 106, each entity is by the TE replacement Timer C separately that receives, so, the Timer C of each entity has enough durations to wait for formal response, AS just needn't guarantee each back to the formal response of TU entity continuation wait by sending Temporary Response repeatedly as prior art, thereby significantly reduces the number of times that transmits Temporary Response between each TU entity.
Wherein,, can use that existing reserved field carries this duration in the Temporary Response, also can be the new field of Temporary Response structure and carry this duration for being implemented in the duration that carries Session Timer in the Temporary Response.
In addition, the calling party may might not belong to same management domain (administrative domain) with AS, and therefore, calling party's TU entity might not be supported the Session Timer duration that AS returns.Consider this kind situation, the invention allows for another kind of embodiment, this embodiment and shown in Figure 1 basic identical, difference is to set up request (as: INVITE) from the session of calling terminal: in the present embodiment, calling terminal is when sending session foundation request, carry the Session Timer duration scope of self supporting therein, such as: a maximum duration and a minimum duration carried; AS therefrom resolves after the session foundation request that receives from calling terminal and obtains this Session Timer duration scope, and optional duration from this duration scope is defined as the duration of Session Timer with it and returns to the back to the TU entity.Like this, the duration of the Session Timer that receives can be supported in each back that can guarantee the calling party to the TU entity.Here, carry Session Timer duration scope, can use session to set up that existing reserved field carries this duration scope in the request, also can be session and set up the new field of request structure and carry this duration scope for being implemented in the session request of setting up.
Based on the invention described above method, the invention allows in a kind of SIP network the system of control Session Timer, this system comprises: AS and be provided with the back to the TU entity of Session Timer; Wherein, comprise duration among the AS unit is set, the back comprises the duration reset cell in the TU entity; Described duration is provided with the unit and is used for determining the duration of Session Timer and exporting described duration reset cell to, and described duration reset cell is used for from described duration the unit being set and receives the duration of described Session Timer and reset behind self place to the Session Timer of TU entity by the duration of this Session Timer.Described duration is provided with the unit and can comprises: duration determination module and duration output module, described duration reset cell can comprise: duration input module and duration configuration module.
Fig. 2 forms structural representation for system of the present invention one preferred embodiment.As described in Figure 2, this system comprises: AS and the duration that comprises thereof are provided with unit, back to TU entity 1 and the duration reset cell that comprises thereof.This duration is provided with the unit and further comprises: duration determination module and duration output module; This duration reset cell further comprises: duration input module 1 and duration configuration module 1.
Wherein, the duration determination module is used for determining the current sessions length of timer and sending to the duration output module; This duration output module is used for the duration of the Session Timer that will receive and exports to duration input module 1, such as: in the Temporary Response of TU entity 1, carry the duration of this Session Timer and export by mail to the back at AS.Duration input module 1 is used to receive from the duration of the Session Timer of duration output module and sends to duration configuration module 1.What receive when duration input module 1 is that this duration input module 1 will be resolved the duration that obtains this Session Timer when carrying the Temporary Response of duration of Session Timer from Temporary Response.1 of duration configuration module be used for by behind self place of resetting from the duration of the Session Timer of duration input module 1 to the Session Timer of TU entity 1.
Certainly, between from AS to the caller, not necessarily only have one after to the TU entity, AS comprises to having a plurality of back between the caller to the TU entity: AS connects back to TU entity and back to the TU entity connected back to the TU entity.Wherein, each back is provided with Session Timer, and all comprises a duration reset cell in the TU entity.The forwarding of the duration of Session Timer will be realized in each back between the TU entity, so the duration reset cell of back in the TU entity will further comprise: the duration forwarding module.This duration forwarding module is used for the session length of timer is forwarded to the duration reset cell of other back to the TU entity.
As shown in Figure 2, this system can comprise further that the back is to TU entity 2, this back comprises to the duration reset cell 2 that TU entity 2 comprises: duration input module 2, duration configuration module 2 and duration forwarding module 2 also will further comprise in the duration reset cell 1 that described back comprises in TU entity 1: duration forwarding module 1.
At this moment, duration input module 1 also will be exported this duration and give duration forwarding module 1 after receiving the duration of Session Timer.The duration that duration forwarding module 1 is used for the Session Timer that will receive sends to the duration reset cell that other back comprises to the TU entity, this other back back to TU entity connection after the TU entity be this duration forwarding module 1 place, i.e. back among Fig. 2 to TU entity 2 to the TU entity.Duration input module 2 receives the duration of Session Timer and exports to duration configuration module 2 and duration forwarding module 2 from duration forwarding module 1, this duration configuration module 2 will be reset the back to the Session Timer of TU entity 2 by the Session Timer duration that receives, and this duration forwarding module 2 also will be transmitted to the duration of Session Timer behind self place to other back that TU entity 2 connects to the TU entity.
The system that comprises after two to the TU entity only is shown among Fig. 2; when the back to the TU entity during greater than two; each back inside composition between the TU entity is identical to TU entity 2 with the back to TU entity 1 with back shown in Figure 2 with annexation; this paper just describes in detail no longer one by one, but all within protection scope of the present invention.
In sum, adopt the inventive method and system can make the Session Timer of each back of the unified control of AS, thereby significantly reduce the transmission number of times that Temporary Response in the process is set up in session, save the system bandwidth resource, be beneficial to the whole quality of service that improves to the TU entity.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.

Claims (15)

1, the method for control Session Timer in a kind of session initiation protocol SIP network, this method is applied to comprise: applied business server A S reaches thereafter to the system of affairs user TU entity, and described back is provided with Session Timer to the TU entity; It is characterized in that described AS is with called when setting up session, this method comprises:
A. described AS determines the duration of described Session Timer and sends to the back to the TU entity;
B. the described back of steps A reconfigures the Session Timer of self by the duration of the Session Timer that receives to the TU entity.
2, method according to claim 1 is characterized in that, it is a plurality of that described back has to the TU entity, comprising: AS connects back to TU entity and back to the TU entity connected back to the TU entity;
Described step B further comprises: it is back to the TU entity that the back duration that sends this Session Timer to the TU entity that this AS connects connects to self, each back sends back to the TU entity that the duration of this Session Timer connects to self after the TU entity is receiving the Session Timer duration, reconfigure the Session Timer of self behind back to the TU entity other that removes that described AS connects respectively by the Session Timer duration that receives separately to the TU entity.
3, method according to claim 1 and 2 is characterized in that, in the steps A, the duration of described transmission Session Timer to the back to the method for TU entity is:
Send by the duration that after returning to, in the Temporary Response of TU entity, carries this Session Timer.
4, method according to claim 3 is characterized in that, in the steps A, described method of carrying the duration of Session Timer in Temporary Response is:
Existing reserved field carries the duration of this Session Timer in the use Temporary Response, perhaps carries the duration of this Session Timer for the new field of this Temporary Response structure.
5, method according to claim 3 is characterized in that, described Temporary Response is the arbitrary message in 101 to 199 message of SIP.
6, method according to claim 3 is characterized in that, further comprises before steps A: the Session Timer duration scope that the caller transmission is supported self is to described AS;
In the steps A, the method for described definite Session Timer duration is: AS chooses a duration wantonly as the current sessions length of timer from the Session Timer duration scope that self receives.
7, method according to claim 6 is characterized in that, the method that described caller sends Session Timer duration scope is: send by carrying this Session Timer duration scope in the session foundation request of mailing to AS in caller.
8, method according to claim 7 is characterized in that, described method of carrying Session Timer duration scope in session foundation request is:
Existing reserved field carried this Session Timer duration scope during the use session was set up and asked, and perhaps constructed new field for this session request of setting up and carried this Session Timer duration scope.
9, method according to claim 1 and 2 is characterized in that, described Session Timer is timer Timer C.
10, method according to claim 1 and 2 is characterized in that, described back to the TU entity for acting on behalf of Proxy or sip server or User Agent Client/subscriber proxy server UAC/UAS.
11, the system of control Session Timer in a kind of SIP network, this system comprises: AS reaches thereafter to the TU entity, and described back is provided with Session Timer to the TU entity; It is characterized in that described AS comprises duration the unit is set, described back comprises the duration reset cell to the TU entity;
Described duration is provided with the unit, is used for determining the duration of Session Timer and exporting described duration reset cell to;
Described duration reset cell is used for from described duration the unit being set and receives the duration of described Session Timer and reset behind self place to the Session Timer of TU entity by the duration of this Session Timer.
12, system according to claim 11 is characterized in that, described duration is provided with the unit and comprises:
The duration determination module is used for determining the duration of Session Timer and exporting described duration output module to;
The duration output module is used to receive from the Session Timer duration of duration determination module and exports described duration reset cell to.
13, system according to claim 11 is characterized in that, described duration reset cell comprises:
The duration input module is used for from described duration the unit being set and receives the duration of described Session Timer and be sent to the duration configuration module;
The duration configuration module is used for by self described back Session Timer to the TU entity of resetting from the duration of the Session Timer of described duration input module.
14, system according to claim 13 is characterized in that, it is a plurality of that described back has to the TU entity, comprising: AS connects back to TU entity and back to the TU entity connected back to the TU entity; Each back comprises a duration reset cell to the TU entity; Described duration reset cell further comprises:
The duration forwarding module, be used for receiving the duration of described Session Timer and being forwarded to other back to the duration input module of TU entity from described duration input module, this other back to the TU entity for behind this duration forwarding module place to the TU entity connected back to the TU entity.
According to each described system of claim 11 to 14, it is characterized in that 15, described back to the TU entity is: Proxy or sip server or UAC/UAS.
CN200610066521.2A 2006-03-28 2006-03-28 Method and system for control conversation timer in conversation iniatial protocol network Expired - Fee Related CN100486254C (en)

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CN108289079B (en) * 2017-01-09 2020-07-10 大唐移动通信设备有限公司 Method and device for controlling session refreshing time length
CN110311808A (en) * 2019-06-06 2019-10-08 厦门亿联网络技术股份有限公司 A kind of the stability verification method and system of universal protocol network

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