CN1870630A - Method for establishing call using session initial protocol - Google Patents
Method for establishing call using session initial protocol Download PDFInfo
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- CN1870630A CN1870630A CN 200510100723 CN200510100723A CN1870630A CN 1870630 A CN1870630 A CN 1870630A CN 200510100723 CN200510100723 CN 200510100723 CN 200510100723 A CN200510100723 A CN 200510100723A CN 1870630 A CN1870630 A CN 1870630A
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Abstract
This invention provides a method for setting up call by initialized session protocols including: refreshing the state ID of communication links, when usable communication links exists, they are selected, when there are no usable inks, the line is disconnected, which can reduce waste of signaling resources.
Description
Technical field
The invention belongs to the communications field, relate in particular to by conversation initialized protocol (SIP) and set up the method for calling out.
Background technology
SIP (Session Initiation Protocol, conversation initialized protocol) is the signaling protocol of being formulated by IETF (Internet standard formulation tissue) towards Internet meeting and phone.SIp is the agreement of an application layer, can set up, revises or end Multimedia session or calling.Detailed content about Session Initiation Protocol sees also RFC 3261 agreements, and the present invention repeats no more.SIP (Session InitiationProtocol, conversation initialized protocol) is a kind of important interoffice junction agreement, and the user of two interoffices can connect by the SIP signaling.
Realization flow when Fig. 1 shows two interoffices and sets up normal call:
A.A office sends invite message for B office, and request connects.
B.B office sends 100 for A office, and A office stops to retransmit the invite timer.
C.B office sends 180 for A office, puts ring-back tone.
D. called off-hook, B office sends 200 for A office.
E.A office sends ACK for B office, confirms to have received 200, and whole SIP end of signaling, the user is in talking state.
In some cases, for example caller is broken down or called breaking down can not the treatment S IP signaling time to called a certain communication link, caller selects the caller SIP of fault communication link striking out can't receive called response signaling, cause caller SIP to retransmit invite message, during timer B ultrasonic in Session Initiation Protocol, wherein, timer B is the timer that stops to retransmit invite in the Session Initiation Protocol.Handling process in this case is as shown in Figure 2:
A.A office sends invite message for B office, and request connects.
B.B office is response not, and after second, invite message is retransmitted to the SIP timer by A office through T1.Wherein, T1 is the timer time of Session Initiation Protocol, is defaulted as 0.5 second.
C.B office is response not, and after second, invite message is retransmitted to the SIP timer by A office through 2 * T1.
D.B office is response not, and after second, invite message is retransmitted to the SIP timer by A office through 4 * T1.
Invite retransmits always in A office, and each timer is previous 2 times, and after second, SIP just finishes current affairs up to T2, sends invite to the upper strata report and makes mistakes, and takes out stitches in the upper strata.Wherein, T2 is the timer time of Session Initiation Protocol, is defaulted as 32 seconds.
This shows that in said process, SIP is occupied always with relevant signal resource, cause the waste of the communication resource, if A office has caused selecting the user of fault communication link normally not connect to other available communication link that also has of B office simultaneously, reduced user's call completing rate.
Summary of the invention
The objective of the invention is to solve when the interoffice communication link occurs fault, existing call handling process causes the waste of the communication resource, reduces the problem of user's call completing rate simultaneously.
In order to realize goal of the invention, the invention provides a kind of method of utilizing conversation initialized protocol to set up and call out, described method comprises:
The status indicator of new communication link more;
When having available communication link, it is out to select available communication link to call out;
When not having available communication link, directly take out stitches.
The step of the status indicator of described more new communication link further comprises the steps:
Local exchange periodically by described communication link to the transmission detection messages of playing a game;
When local exchange was received the response message of playing a game in timing, identifying described communication link can use;
When local exchange was not received the response message of playing a game in regularly, it was unavailable to identify described communication link.
Described method further comprises:
The detection timer of described communication link is set;
When described detection timer expiry, local exchange sends detection messages to playing a game by described communication link, plays a game with sending response message to local exchange after receiving detection messages, and described communication link is designated available, restarts described detection timer;
After local exchange is received the response message of playing a game, described communication link is designated available, restarts described detection timer.
Described method further comprises:
When described detection timer expiry, local exchange by described communication link to the transmission detection messages of playing a game, if the response message that not receiving plays a game returns, local exchange is again to the transmission detection messages of playing a game, until described detection timer expiry, local exchange is designated described communication link unavailable, restarts described detection timer.
Described detection messages realizes by options, info or update message.
Can reduce the signal resource waste by the present invention, improve user's call completing rate.
Description of drawings
Fig. 1 is that realization flow figure is set up in station to station call;
Fig. 2 is the call flows figure when communication link breaks down;
Fig. 3 is that interoffice provided by the invention is set up the realization flow figure that calls out;
Fig. 4 is the realization flow figure of detection communication link state provided by the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 3 shows the realization flow that interoffice foundation is called out among the present invention:
Among the step S301, caller selects available communication link to make a call according to the status indicator of communication link.
Among the step S302, judging whether to have available communication link, is execution in step S303 then, otherwise execution in step S304.
Among the step S303, if a plurality of available communication links are arranged, an available communication link route striking out is selected in caller, and follow-up call flow repeats no more as previously mentioned.
Among the step S304, if there is not available communication link, caller is directly taken out stitches.
In said process, there not being under the situation of available communication link caller directly take out stitches, avoided causing SIP occupied always with relevant signal resource because of repeating to send invite message, cause the waste of the communication resource; When having available communication link, the communication link that can avoid breaking down is called out by available communication link, has improved user's call completing rate simultaneously.
In the present invention, between the SIP trunk by the timed sending detection messages, the state of the communication link that upgrades in time.For the communication link that breaks down, be designated unavailablely, after receiving detection messages next time, be designated available again when being identified as disabled communication link.
As one embodiment of the present of invention, the SIP detection messages uses options message to realize that realization flow supposes that A has 2 communication link L1 and L2 to B as shown in Figure 4, and the detection timer at communication link L1 and L2 is set.
L2 describes with communication link:
A. the detection timer expiry of communication link L2, A office sends options to B office by communication link L2.
B.B office sends response message after receiving options, then communication link L2 is designated availablely, restarts L2 and detects timer; After A office receives that 200 of B office is replied, communication link L2 is designated available, restarts the detection timer of communication link L2.
C. the detection timer expiry of communication link L2, A office sends the options message by communication link L2 to B office, but communication link L2 breaks down not response.A office transmission message is up to detecting timer expiry.A office is unavailable with the status indicator of communication link L2 after overtime, restarts the detection timer of communication link L2.
When have calling from A office Incoming and to the striking out of B office this moment, can not select the communication link L2 striking out of fault, if communication link L1 can use, just select communication link L1 striking out; If communication link L1 is also unavailable, then A office does not have available link between the B office, and A office takes out stitches.Obviously, also identical from B office Incoming to the processing of A office striking out.
D. the detection timer expiry of communication link L2, A office sends the options message by communication link L2 to B office.
If e. communication link L2 has recovered normally, B office responds 200 and replys, and is available with the status indicator of communication link L2, restarts the detection timer of communication link L2; A office receives to detect and replys, again communication link L2 is updated to available, the detection timer of the unblank of laying equal stress on letter link L2.
In other embodiment of the present invention, the SIP detection messages can also use info, update or other sip messages to realize that realization flow repeats no more as mentioned above.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1, a kind of method of utilizing conversation initialized protocol to set up and call out is characterized in that described method comprises:
The status indicator of new communication link more;
When having available communication link, it is out to select available communication link to call out;
When not having available communication link, directly take out stitches.
2, the method for claim 1 is characterized in that, the step of the status indicator of described more new communication link further comprises the steps:
Local exchange periodically by described communication link to the transmission detection messages of playing a game;
When local exchange was received the response message of playing a game in timing, identifying described communication link can use;
When local exchange was not received the response message of playing a game in regularly, it was unavailable to identify described communication link.
3, method as claimed in claim 2 is characterized in that, described method further comprises:
The detection timer of described communication link is set;
When described detection timer expiry, local exchange sends detection messages to playing a game by described communication link, plays a game with sending response message to local exchange after receiving detection messages, and described communication link is designated available, restarts described detection timer;
After local exchange is received the response message of playing a game, described communication link is designated available, restarts described detection timer.
4, method as claimed in claim 3 is characterized in that, described method further comprises:
When described detection timer expiry, local exchange by described communication link to the transmission detection messages of playing a game, if the response message that not receiving plays a game returns, local exchange is again to the transmission detection messages of playing a game, until described detection timer expiry, local exchange is designated described communication link unavailable, restarts described detection timer.
5, method as claimed in claim 2 is characterized in that, described detection messages realizes by options, info or update message.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510100723 CN1870630A (en) | 2005-10-25 | 2005-10-25 | Method for establishing call using session initial protocol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510100723 CN1870630A (en) | 2005-10-25 | 2005-10-25 | Method for establishing call using session initial protocol |
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| Publication Number | Publication Date |
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| CN1870630A true CN1870630A (en) | 2006-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200510100723 Pending CN1870630A (en) | 2005-10-25 | 2005-10-25 | Method for establishing call using session initial protocol |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001292B (en) * | 2006-12-31 | 2010-08-11 | 华为技术有限公司 | Relay detection method and device |
| CN109792599A (en) * | 2016-10-12 | 2019-05-21 | 华为技术有限公司 | Conversation managing method and network element |
-
2005
- 2005-10-25 CN CN 200510100723 patent/CN1870630A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001292B (en) * | 2006-12-31 | 2010-08-11 | 华为技术有限公司 | Relay detection method and device |
| CN109792599A (en) * | 2016-10-12 | 2019-05-21 | 华为技术有限公司 | Conversation managing method and network element |
| US11483898B2 (en) | 2016-10-12 | 2022-10-25 | Huawei Technologies Co., Ltd. | Session management method and session management network element |
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