CN101247313A - Out-trunk call establishment method - Google Patents
Out-trunk call establishment method Download PDFInfo
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- CN101247313A CN101247313A CNA200710005098XA CN200710005098A CN101247313A CN 101247313 A CN101247313 A CN 101247313A CN A200710005098X A CNA200710005098X A CN A200710005098XA CN 200710005098 A CN200710005098 A CN 200710005098A CN 101247313 A CN101247313 A CN 101247313A
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Abstract
The invention discloses an out-trunk call establishing method, which comprises the following steps: S502, a soft switch centre selects and occupies relay circuit; S504, the soft switch centre transmits increasing command to a relay gateway to indicate preparing media resource; and S506, the soft switch centre waits the response of the relay gateway and does not transmit original address information to inform an opposite office before receiving the success response of the relay gateway; when the soft switch centre receives the original address information from the opposite office, the soft switch centre obtains the occupying state of relay circuit directly, thereby performing further connection process of calling.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of out-trunk call-establishing method.
Background technology
Soft switch is as the calling of next generation network (NGN) and the core of control, the calling control of real-time service is provided and is connected control, it one very important function be and the intercommunication of traditional PSTN net the access of support relaying.Tandem Gateway TG mainly is responsible for PSTN Netcom and crosses trunk line access IP kernel heart net, finishes the translation function of the voice and the IP network side voice of PSTN trunk side, finishes the call setup of Circuit Switching Network and IP network together under the control of soft switch with SGW.When set up calling out with traditional exchange office, the continuing of medium because the network difference also is divided into traditional PSTN net and two parts of IP network.The NO.7 signaling transmits between soft switch and traditional exchange office by SGW.Soft switch is used NO.7 signaling (as ISUP) to make a call and is notified selecting for use of the other side's interoffice junction circuit, realizes media resource control and management function by agreement H.248/MGCP, and the control Tandem Gateway is finished continuing of IP side medium.
Here H.248 to be example, it is a kind of principal and subordinate's control protocol, uses destination node to describe the entity of initiation and receiving media stream, and destination node has the such physics destination node of repeat circuit, and the such temporary destination node of rtp streaming is also arranged.These destination nodes link together by association, and association is exactly the combination that destination node connects formation each other.H.248 defined some orders and come related and destination node are operated and managed, order is used for increasing destination node in an association as Add.
The NO.7 signaling is a kind of interoffice common channel signalling of using always.The common channel signalling characteristics are to adopt independent path to transmit signaling, so signaling channel is unimpeded may not speech path also unimpeded, and this telephone network for highly reliable requirement is a problem that will solve, and solution is exactly a continuity check.So-called continuity check is exactly the whether unimpeded check of carrying out of repeat circuit that signaling is selected, if check result failure then call release immediately, success just allow this to call out to continue to set up.The implementation method of continuity check normally make a start the office connect transmitter-receiver at the outgoing repeat circuit, this repeat circuit is received in the loop that opposite end office will be used to check.The office that makes a start sends the check sound with transmitter on repeat circuit, and with the reception signal to noise ratio of receiver, if transmission quality and time limit are within the limits prescribed, just think the conducting success.Be example with ISUP interoffice common channel signalling on signaling, if the office's of making a start request continuity check, it is that this section or leading portion repeat circuit carry out continuity check that the conducting indication is arranged in initial address message IAM.After the IAM message of these two different conducting indications is received by opposite end office timer is set and waits for the conducting results messages, suspend call proceeding up to receiving the conducting success message.Their difference is that opposite end office is the check loop just to be set during at this section repeat circuit continuity check in conducting indication, and the continuity check that is designated as the leading portion repeat circuit is that the check loop is not set.
After the flow process of talking about the out-trunk call setup in the control protocol of Tandem Gateway all advises earlier media resource foundation being finished, just send signaling message notice opposite end office and set up calling.Doing like this is to set up consistently with traditional junction call, promptly chooses repeat circuit earlier and sends signaling again and begin set up to call out.In flexible exchanging network, it is dynamic that the media resource of Tandem Gateway IP side distributes, and this process correspondence the repeat circuit selection that traditional junction call is set up.But there is time delay in the IP network interacting message, and it is long that the possible time is compared in medium foundation with the traditional electrical phone network like this.After soft switch chooses repeat circuit and takies, allow Tandem Gateway prepare media resource by control protocol as agreement H.248, and the result is returned to soft switch.This process soft switch is a seizure condition and opposite end office is idle to this repeat circuit, if opposite end office chooses it also to make a call and simultaneous hold will occur, the time delay of IP network just makes this may the increase.Simultaneous hold just is meant that this both sides take the phenomenon of same repeat circuit simultaneously, says so exactly to take and receives the call setup message that opposite end office sends this repeat circuit immediately after repeat circuit sends call setup message notice opposite end office.
CN200510033940 Chinese patent " solution of inside and outside simultaneous hold under a kind of signaling and the service separate structure " discloses the method that simultaneous hold is handled under a kind of NGN network.This invention is at the processing that occurs simultaneous hold in the call setup under flexible exchanging network business, the signaling separation architecture.The place that it takes place according to simultaneous hold proposes the notion of outer simultaneous hold and interior simultaneous hold.Outer with take a position the finger system with in abutting connection with Signalling exchange between the office, and interior simultaneous hold is the mutual of internal system primitive message, wherein interior simultaneous hold has only residing position different with outer simultaneous hold, processing method and reason to occur be the same in essence.The present invention is different with it, does not have to divide with getting the jump in the inter-process opsition dependent, but utilizes this condition judgment of circuit seizure condition, with the unified processing of the processing of simultaneous hold.
Summary of the invention
The object of the present invention is to provide a kind of new out-trunk call-establishing method, to reduce the possibility that simultaneous hold takes place.
A kind of out-trunk call-establishing method according to the present invention may further comprise the steps: S502, and repeat circuit is selected and taken to soft switch center; S504, soft switch center sends to increase and orders to Tandem Gateway indication Tandem Gateway preparation media resource; And S506, soft switch center is waited for the response of Tandem Gateway, before the success response that does not receive Tandem Gateway, does not send initial address message notice opposite end office; Under soft switch center received situation from the initial address message of opposite end office, soft switch center was directly obtained the repeat circuit seizure condition, thereby calls out the processing that further continues.
In soft switch center is under the situation of master office, soft switch center is provided with timer and prepares the response of media resource to wait for Tandem Gateway, before timer expiry, receive under the situation from the success response of Tandem Gateway, soft switch center sends initial address message to opposite end office, timer expiry or overtime before receive from the medium of Tandem Gateway and set up under the situation of failure response, soft switch center starts calls out dispose procedure.
In soft switch center is under the situation of non-master office, and soft switch center directly continues the incoming call that continues, and reselects a new repeat circuit reattempt.
Under the occupied situation of repeat circuit, soft switch center is determined to occur simultaneous hold and is handled.
Another kind of out-trunk call-establishing method according to the present invention may further comprise the steps: S602, and soft switch center is selected and is taken repeat circuit and send initial address message notice opposite end office, and opposite end office is provided with first timer and waits for the conducting results messages; S604, in the timing of first timer, soft switch center sends to Tandem Gateway increases order with indication Tandem Gateway allocation medium resource, and the response that second timer is waited for Tandem Gateway is set, wherein, the timing of first timer is greater than the timing of second timer; S606, receiving media resource in soft switch center distributes under unsuccessful response or the overtime situation that does not receive response, soft switch center sends the continuity check failed message to opposite end office, receiving media resource in soft switch center sets up under the situation of success response, soft switch center sends the continuity check success message to opposite end office, and opposite end office continues to set up calls out.
Initial address message comprises the conducting indication, is used to represent that the leading portion circuit has continuity check.
The present invention has proposed processing method with regard to the problem that soft switch out-trunk call setup exists from two aspects, traditional foundation earlier sent means of signaling behind the medium and proposed a kind of improvement that simultaneous hold is handled, and the simultaneous hold that the out-trunk that Tandem Gateway is participated in is called out is handled and can be used simultaneous hold processing method commonly used equally to handle.
In addition, the present invention is directed to the intrinsic defective of conventional method itself and proposed to finish the method that medium are set up after the first transmission signaling, this method shortens the inconsistent time of circuit state, reduces the possibility that simultaneous hold takes place, and improves percept of call completed.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the network topological diagram of soft switch and the intercommunication of traditional exchange office;
Fig. 2 is that soft switch was set up flow chart under the situation that can not get responding as master office when simultaneous hold took place under the traditional approach at medium;
Fig. 3 is that soft switch was set up flow chart under the situation about correctly being responded as master office when simultaneous hold took place under the traditional approach at medium;
Fig. 4 be when simultaneous hold takes place under the traditional approach soft switch as the flow chart of non-master office;
Fig. 5 is the flow chart according to the out-trunk call-establishing method of the embodiment of the invention;
Fig. 6 is the flow chart of out-trunk call-establishing method according to another embodiment of the present invention; And
Fig. 7 is the flow chart according to the out-trunk call-establishing method of further embodiment of this invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
Fig. 1 is the network topological diagram of soft switch and the intercommunication of traditional PSTN exchange.In the figure, the core control equipment of soft switch is called SS, and SGW is called SG, and Tandem Gateway is called TG.Soft switch uses the TUP/ISUP agreement to set up calling by the control of protocol command message H.248/MGCP Tandem Gateway operation destination node between soft switch and the traditional exchange office, H.248 following explanation uses that agreement and ISDN User Part illustrate flow process as example.
Fig. 2 is that soft switch was set up flow chart under the situation that can not get responding as master office when simultaneous hold took place under the traditional approach at medium.In Fig. 2, soft switch is set up out-trunk in the conventional mode and is called out, and promptly earlier media resource is set up to finish and initiates signaling foundation calling again.In setting up the process of medium, have into junction call, but this moment, this circuit was taken by soft switch.Cause the junction call of coming in and going out all influenced if handle bad meeting this moment.This situation also can be considered as a kind of simultaneous hold, but it with general simultaneous hold different be to have a side not send IAM message when simultaneous hold occurring, also some is special in its processing.What this figure showed is soft switch handling process as master office when not receiving media resource foundation response, specifies as follows:
S202, the soft switch desire is initiated out-trunk and is called out, and chooses repeat circuit and marking circuit is occupied, and the Add order by H.248 allows Tandem Gateway prepare media resource then, and the response that timer is waited for Tandem Gateway is set, and timer duration is about 5 seconds;
S204 receives the IAM message of opposite end office in the process of waiting for the Tandem Gateway response, this circuit is also taken by the other side.Simultaneous hold has taken place and has judged that oneself is master office in soft switch seizure condition judgement according to this circuit when not sending IAM message, and the other side's IAM message is not handled in soft switch like this, sets up response message and continue the wait medium;
S206, when wait for medium set up the timer expiry of response after or provide the response of failure, soft switch starts dispose procedure, sends REL message to opposite end office.The reason of doing like this is that soft switch does not send IAM message and goes out, and simultaneous hold is not known to have taken place by opposite end office, therefore needs to send REL and notify the other side dismantling call.
What Fig. 3 illustrated is the another kind of situation relative with Fig. 2, and promptly the response message that the back soft switch continues to wait for medium foundation takes place simultaneous hold, and Tandem Gateway has returned successful response, specifies as follows:
S302, the soft switch desire is initiated out-trunk and is called out, and chooses repeat circuit and marking circuit is occupied, and the Add order by H.248 allows Tandem Gateway prepare media resource then, and the response that timer is waited for Tandem Gateway is set, and timer duration is about 5 seconds;
S304 receives the IAM message of opposite end office in the process of waiting for the Tandem Gateway response, this circuit is also taken by the other side.Simultaneous hold has taken place and has judged that oneself is master office in soft switch seizure condition judgement according to this circuit when not sending IAM message, and the other side's IAM message is not handled in soft switch like this, sets up response message and continue the wait medium;
S306 after the success response Reply message of Tandem Gateway is received in soft switch, stops the timer of wait-for-response;
S308, soft switch sends sets up the IAM message that out-trunk is called out, notice opposite end office taking this circuit.Opposite end office receives and can judge after the message and simultaneous hold occurred, because it is non-master office, this call proceeding is gone down, and the own calling of initiating is selected circuit else and rebulid.
What Fig. 4 illustrated is that soft switch was the situation of non-master office after simultaneous hold took place.The reason that simultaneous hold takes place explains the situation the same with determination methods with Fig. 2, Fig. 3.Current soft switch is as non-master office, and judgement simultaneous hold occurs and oneself is non-master office according to the specified circuit state after receiving the IAM of opposite end office message, and the processing of back is handled similar with general simultaneous hold.Soft switch needs to go into junction call and continues successfully, selects a repeat circuit else and makes a call again, and this situation is not understood specifically at this.
Fig. 5 is the flow chart according to the out-trunk call-establishing method of the embodiment of the invention.In flow process shown in Figure 5, soft switch is gone to toward the increase order preparation medium that pass through control protocol earlier at transmission initial address message (IAM) according to the suggestion of gateway control protocol to the relaying call setup, and wait-for-response.At this moment soft switch has been selected repeat circuit and has been taken, but does not notify opposite end office.In case this moment, opposite end office made a call, and a kind of simultaneous hold phenomenon will occur.That this simultaneous hold and usually said simultaneous hold are slightly different is the inreal IAM of the transmission message informing of soft switch side the other side.The detection of this simultaneous hold can check after the NO7 signalling module is received IAM message that the state of repeat circuit judges, can equally handle according to simultaneous hold processing method commonly used in case just judge.This out-trunk call-establishing method specifically may further comprise the steps:
S502, repeat circuit is selected and taken to soft switch center;
S504, soft switch center sends to increase and orders to Tandem Gateway indication Tandem Gateway preparation media resource; And
S506, soft switch center is waited for the response of Tandem Gateway, before the success response that does not receive Tandem Gateway, does not send initial address message notice opposite end office; Under soft switch center received situation from the initial address message of opposite end office, soft switch center was directly obtained the repeat circuit seizure condition, thereby calls out the processing that further continues.
In soft switch center is under the situation of master office, and it will be provided with the response that timer is waited for Tandem Gateway preparation medium.Under the situation of the response of succeeding before timer expiry, soft switch center sends IAM message to opposite end office, and opposite end office's IAM message is dropped.If timer expiry or overtime preceding Tandem Gateway response medium are set up failure, then soft switch starts the calling dispose procedure.Because the other side does not receive IAM, it does not know to take place simultaneous hold, and soft switch must in time discharge incoming call.
In soft switch is under the situation of non-master office, directly incoming call is continued to continue, and reselects a new repeat circuit reattempt.Because the opposite end is a master office, whether it knows that simultaneous hold is related not quite.
Fig. 6 is the flow chart of out-trunk call-establishing method according to another embodiment of the present invention.In flow process shown in Figure 6, take when soft switch makes a call and can send initial address signaling message notice opposite end office behind the circuit immediately, begin to prepare media resource afterwards, the initial address message of transmission (IAM) lining indication leading portion circuit has continuity check.The conducting indication (CCI) of IAM message is the check of leading portion circuit turn-on, can avoid opposite end office to receive like this building the continuity check loop after the message causing the wasting of resources, while also makes opposite end office wait for the conducting result and can not continue immediately, and this stand-by period can offer soft switch and prepare media resource.By the time after media resource is set up and finished between soft switch and the Tandem Gateway, send the conducting success message to opposite end office.Do that so the inconsistent time of interexchange circuit state is dwindled, reduce the possibility that simultaneous hold takes place.This out-trunk call-establishing method specifically may further comprise the steps:
S602, soft switch center is selected and is taken repeat circuit and send initial address message notice opposite end office, and opposite end office will just continue replay call after will waiting for normal conducting result.Opposite end office waits for that the general duration of first timer T8 of conducting results messages is 10～15 seconds.Wherein, the continuity check in the initial address message represents that language indication leading portion circuit has continuity check.
S604, in the timing of first timer T8, soft switch center sends to Tandem Gateway increases order with indication Tandem Gateway allocation medium resource, and the second timer of preparing media resource is set, wherein, the timing of first timer is greater than the timing of second timer, and the timing of second timer was generally about 5 seconds.
S606, receiving media resource in soft switch center distributes under unsuccessful response or the overtime situation that does not receive response, soft switch center sends the continuity check failed message to opposite end office, receiving media resource in soft switch center sets up under the situation of success response, soft switch center sends the continuity check success message to opposite end office, and opposite end office continues to set up calls out.Wherein, initial address message comprises the conducting indication, is used to represent that the leading portion circuit has continuity check.
Fig. 7 is the flow chart according to the out-trunk call-establishing method of further embodiment of this invention.In flow process shown in Figure 7, use continuity check to indicate and obtain setting up the time that medium need, and use the conducting indication of conducting message COT to reflect success or the failure that medium are set up.Out-trunk call-establishing method shown in Figure 7 specifically may further comprise the steps:
S702, the calling of soft switch desire initiation out-trunk chooses repeat circuit and marking circuit is occupied, sends initial address message (IAM) notice opposite end office then.This fast as far as possible the other side that notifies is exactly in order to prevent the inconsistent overlong time of both sides' relay state.Continuity check indication code (CCI) value in the IAM message that sends is 2, and promptly the last period, circuit carried out continuity check.There is this conducting indication can allow opposite end office enter and waits for that conducting message status, soft switch utilize this time to prepare media resource.It is not allow opposite end office remove to build loop because of the continuity check sign that conducting is designated as 2 benefit, because reality is not really to have continuity check.
S704, this section of waiting for the conducting result in opposite end office is in the period, and soft switch utilization Add order notice Tandem Gateway is H.248 prepared medium.
S706, when the response Reply message that the medium of receiving Tandem Gateway are set up, soft switch affirmation media resource is set up and is finished.
S708, when the response that the relaying gateway returns success, the conducting of the conducting message COT band that soft switch sends is designated as the conducting success.
S710, receive the conducting message of success when opposite end office after, what begin to call out continues, and gives soft switch if successfully will return ACM message.
In sum, the present invention proposes a kind of processing method to the simultaneous hold that takes place during call setup in the flexible exchanging network.In addition, the invention allows for a kind of method of out-trunk call setup, avoiding occurring the long inconsistent time of circuit seizure condition, thereby reduce the possibility that simultaneous hold takes place.
Ability will readily understand additional advantages and modifications of the present invention in the technical staff.Therefore, the present invention is not limited to the specific detail and the exemplary embodiments that illustrate and describe herein in the aspect widely.Therefore, can under the condition that does not break away from by claim and the spirit or scope of the present invention that equivalent limited thereof, make various modifications.
Claims (6)
1. an out-trunk call-establishing method is characterized in that, said method comprising the steps of:
S502, repeat circuit is selected and taken to soft switch center;
S504, described soft switch center sends to increase to order to Tandem Gateway indicates described Tandem Gateway to prepare media resource; And
S506, described soft switch center is waited for the response of described Tandem Gateway, before the success response that does not receive described Tandem Gateway, does not send initial address message notice opposite end office; Under described soft switch center received situation from the initial address message of described opposite end office, described soft switch center was directly obtained described repeat circuit seizure condition, thereby calls out the processing that further continues.
2. out-trunk call-establishing method according to claim 1, it is characterized in that, in described soft switch center is under the situation of master office, described soft switch center is provided with timer and prepares the response of media resource to wait for described Tandem Gateway, before described timer expiry, receive under the situation from the success response of described Tandem Gateway, described soft switch center sends initial address message to opposite end office, described timer expiry or overtime before receive from the medium of described Tandem Gateway and set up under the situation of failure response, described soft switch center starts calls out dispose procedure.
3. out-trunk call-establishing method according to claim 1 is characterized in that, is under the situation of non-master office in described soft switch center, and described soft switch center directly continues the incoming call that continues, and reselects a new repeat circuit reattempt.
4. out-trunk call-establishing method according to claim 1 is characterized in that, under the occupied situation of described repeat circuit, described soft switch center is determined to occur simultaneous hold and handled.
5. an out-trunk call-establishing method is characterized in that, said method comprising the steps of:
S602, soft switch center is selected and is taken repeat circuit and send initial address message notice opposite end office, and described opposite end office is provided with first timer and waits for the conducting results messages;
S604, in the timing of described first timer, described soft switch center sends to Tandem Gateway increases order to indicate described Tandem Gateway allocation medium resource, and the response that second timer is waited for described Tandem Gateway is set, wherein, the timing of described first timer is greater than the timing of described second timer;
S606, receiving media resource in described soft switch center distributes under unsuccessful response or the overtime situation that does not receive response, described soft switch center sends the continuity check failed message to described opposite end office, receiving media resource in described soft switch center sets up under the situation of success response, described soft switch center sends the continuity check success message to described opposite end office, and described opposite end office continues to set up calls out.
6. out-trunk call-establishing method according to claim 5 is characterized in that, described initial address message comprises the conducting indication, is used to represent that the leading portion circuit has continuity check.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710005098XA CN101247313B (en) | 2007-02-13 | 2007-02-13 | Out-trunk call establishment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710005098XA CN101247313B (en) | 2007-02-13 | 2007-02-13 | Out-trunk call establishment method |
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| CN101247313A true CN101247313A (en) | 2008-08-20 |
| CN101247313B CN101247313B (en) | 2010-11-10 |
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| CN200710005098XA Expired - Fee Related CN101247313B (en) | 2007-02-13 | 2007-02-13 | Out-trunk call establishment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6839342B1 (en) * | 2000-10-09 | 2005-01-04 | General Bandwidth Inc. | System and method for interfacing signaling information and voice traffic |
| CN1266901C (en) * | 2002-11-14 | 2006-07-26 | 华为技术有限公司 | A call flow setting up method |
| CN100579113C (en) * | 2004-12-21 | 2010-01-06 | 上海贝尔阿尔卡特股份有限公司 | Method for controlling soft exchange call, and soft exchange equipment |
| CN100499696C (en) * | 2005-04-07 | 2009-06-10 | 中兴通讯股份有限公司 | Method for solving interior and exterior simultaneous robbing under signaling and service separate structure |
| CN1870703A (en) * | 2005-12-23 | 2006-11-29 | 华为技术有限公司 | Calling route control method |
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