CN1266901C - A call flow setting up method - Google Patents
A call flow setting up method Download PDFInfo
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- CN1266901C CN1266901C CN 02152502 CN02152502A CN1266901C CN 1266901 C CN1266901 C CN 1266901C CN 02152502 CN02152502 CN 02152502 CN 02152502 A CN02152502 A CN 02152502A CN 1266901 C CN1266901 C CN 1266901C
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- soft switch
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Abstract
The present invention relates to a call flow establishing method which belongs to the communication technical field. Before a soft switch (SS) sends an initial address message (IAM) transmitted by a calling signaling gateway to a called signaling gateway, a calling relay gateway is controlled through a Modify request to obtain an IP address and a port number of a called RTP (Real-Time Position) terminal node; therefore, the SS controls the relay gateway to finish establishing media flow before sending the IAM. Thereby, even if a phone is picked up after called ringing, the condition that the media flow is not established yet after the phone is picked up can not occur. The present invention provides the more perfect call flow establishing method.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method for building up of call flow.
Background technology
Soft switch is the controlled function entity of next generation network (NGN:New Generation Network), the calling control and the connection control function of the business with real-time requirement are provided for next generation network, be that next generation network is called out and the core of controlling, in communication system, control solves through consultation, and correspondingly just necessary protocols having is in the NGN architecture, soft switch is as control centre, just by supporting H.248 to wait various protocols to realize.
H.248 agreement is the control protocol between Media Gateway Controller and the media gateway, it is a kind of principal and subordinate's agreement, based on Media Gateway Controller, media gateway be from, Media Gateway Controller control miscellaneous service gateway, realize the intercommunication of packet network and public switched telephone network (PSTN), present, international and domestic normal structure is to having done related advisory with protocol-dependent call setup flow process H.248.
Destination node (Termination) is the logic entity on the media gateway (MG:Media Gateway), its initiation and/or receiving media and/or control flows, TDM termination is a kind of semipermanent destination node, and RTP termination is a kind of provisional destination node.Related (context) shows the annexation between the destination node, can create by the Add order, make amendment by the Modify order, also can delete by Subtract, Move order, a destination node belongs to and can only belong to an association at any one time.
Be illustrated in figure 1 as the existing call setup flow process of initiating by Trunk Media Gateway (TMG:Trunk Media Gateway), Trunk Media Gateway is connected with the user by the circuit relay in the Circuit Switching Network, call signaling enters Softswitch by SGW (SG:Signaling Gateway) by Signaling System Number 7, and agreement:
(1) calling subscriber is positioned at the compass of competency of Trunk Media Gateway TMG1 and SGW SG1;
(2) called subscriber is positioned at the compass of competency of Trunk Media Gateway TMG2 and SGW SG2;
(3) Trunk Media Gateway TMG1 and TMG2 belong in the compass of competency of a soft switch;
(4) Signaling System Number 7 adopts ISUP (ISUP) signaling;
ISDN User Part message comprises: initial address message IAM (Initial Address Message), Address Complete Message ACM (Address Completion Message), response message ANM (AnswerMessage) etc.
Existing call flow is as follows:
(1) after the subscriber dialing, sends (IAM) to soft switch by caller Signaling System Number 7 gateway.
(2) in TMG1, create one new related (Context), and in association, add semipermanent destination node (TDM) and provisional destination node (RTP).
(3) in TMG2, create a new association, and in association, add semipermanent destination node (TDM) and provisional destination node (RTP).
(4) soft switch sends IAM by called Signaling System Number 7 gateway to Circuit Switching Network, the loopback ACM of Circuit Switching Network, called terminal ringing.
(5) soft switch sends the Modify order to TMG1, inform far-end RTP port numbers and IP address, and notice sends ring-back tone.
(6) soft switch sends ACM to SG1.
(7) called off-hook, SG2 sends ANM to soft switch.
(8) soft switch sends the Modify order to TMG1, cuts off ring-back tone.
(9) soft switch sends ANM to SG1.
When realizing, there is a problem based on above flow process: if off-hook immediately behind the called terminal ringing, can find also not foundation of Media Stream, also can find out by Fig. 1, called Signaling System Number 7 gateway sends to Circuit Switching Network with the IAM that soft switch sends, the loopback ACM of Circuit Switching Network, called terminal ringing, but soft switch receives the ACM of Circuit Switching Network's loopback by called Signaling System Number 7 gateway, obtain the IP address and the port numbers of called RTP destination node again by Modify request control caller Tandem Gateway, the foundation of finishing Media Stream by Tandem Gateway has a fixed response time again, thus immediately during off-hook Media Stream can also not set up.
Summary of the invention
Technical problem to be solved by this invention is: overcome the defective of existing call flow process, when off-hook is provided behind a kind of called terminal ringing immediately, set up the method for building up of the call flow of Media Stream.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be: the method for building up of this call flow may further comprise the steps:
A, subscriber dialing send initial address message by caller Signaling System Number 7 gateway to soft switch;
B, new association of establishment in the caller Trunk Media Gateway, and in association, add semipermanent destination node and provisional destination node;
C, new association of establishment in called Trunk Media Gateway, and in association, add semipermanent destination node and provisional destination node;
D, soft switch send Modify order, provisional destination node port numbers of the far-end of announcement and IP address to the caller Trunk Media Gateway;
E, soft switch send initial address message by called Signaling System Number 7 gateway to Circuit Switching Network, the full message of Circuit Switching Network's loopback address, called terminal ringing;
F, soft switch send the Modify order to the caller Trunk Media Gateway, and notice sends ring-back tone;
G, soft switch send Address Complete Message to caller Signaling System Number 7 gateway.
If off-hook behind the called terminal ringing, call-establishing method is as follows:
H, called off-hook, called Signaling System Number 7 gateway sends response message to soft switch;
I, soft switch send the Modify order to the caller Trunk Media Gateway, cut off ring-back tone;
J, soft switch send response message to caller Signaling System Number 7 gateway.
Beneficial effect of the present invention is: the present invention improves the defective of the call flow of specifications recommend according to the experience in the actual implementation procedure, the IAM that soft switch sends caller Signaling System Number 7 gateway sends to before the called SGW, the IP address and the port numbers of called RTP destination node have been obtained by Modify request control caller Tandem Gateway, so before soft switch sends IAM, controlled the foundation that Tandem Gateway has been finished Media Stream, therefore, even behind the called terminal ringing immediately off-hook can not occur Media Stream behind the off-hook yet and also do not have situation about setting up, the invention provides a kind of method for building up of more perfect call flow.
Description of drawings
Fig. 1 is existing call setup schematic flow sheet of being initiated by Trunk Media Gateway;
The call setup schematic flow sheet that Fig. 2 is initiated by Trunk Media Gateway for the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
As shown in Figure 2, overcoming the above problems needs the control soft switch to send the opportunity of IAM, and this call setup flow process of the present invention is as follows,
(1) after the subscriber dialing, sends IAM to soft switch by caller Signaling System Number 7 gateway (SG1).
(2) in caller Trunk Media Gateway (TMG1), create a new association, and in association, add semipermanent destination node (TDM) and provisional destination node (RTP).
(3) in called Trunk Media Gateway (TMG2), create a new association, and in association, add semipermanent destination node (TDM) and provisional destination node (RTP).
(4) soft switch sends Modify order, the far-end RTP port numbers of announcement and IP address to TMG1.
(5) soft switch sends IAM, the loopback ACM of Circuit Switching Network, called terminal ringing by called Signaling System Number 7 gateway (SG2) to Circuit Switching Network.
(6) soft switch sends the Modify order to TMG1, and notice sends ring-back tone.
(7) soft switch sends ACM to SG1.
(8) behind the called off-hook, SG2 sends ANM to soft switch.
(9) soft switch sends the Modify order to TMG1, cuts off ring-back tone.
(10) soft switch sends ANM to SG1.
After revising like this, though off-hook immediately behind the called terminal ringing, because soft switch has been controlled the foundation that Tandem Gateway has been finished Media Stream before sending IAM, so the situation that Media Stream behind the off-hook also not have foundation can not occur.
Claims (2)
1. the method for building up of a call flow may further comprise the steps:
After A, the subscriber dialing, send initial address message to soft switch by caller Signaling System Number 7 gateway;
B, new association of establishment in the caller Trunk Media Gateway, and in association, add semipermanent destination node and provisional destination node;
C, new association of establishment in called Trunk Media Gateway, and in association, add semipermanent destination node and provisional destination node;
D, soft switch send the Modify order to the caller Trunk Media Gateway, inform provisional destination node port numbers of far-end and IP address;
E, soft switch send initial address message by called Signaling System Number 7 gateway to Circuit Switching Network, the full message of Circuit Switching Network's loopback address, called terminal ringing;
F, soft switch send the Modify order to the caller Trunk Media Gateway, and notice sends ring-back tone;
G, soft switch send Address Complete Message to caller Signaling System Number 7 gateway.
2. according to the method for building up of the call flow shown in the claim 1, it is characterized in that: if off-hook behind the called terminal ringing, call-establishing method is as follows:
Behind H, the called off-hook, called Signaling System Number 7 gateway sends response message to soft switch;
I, soft switch send the Modify order to the caller Trunk Media Gateway, cut off ring-back tone;
J, soft switch send response message to caller Signaling System Number 7 gateway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02152502 CN1266901C (en) | 2002-11-14 | 2002-11-14 | A call flow setting up method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02152502 CN1266901C (en) | 2002-11-14 | 2002-11-14 | A call flow setting up method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1501650A CN1501650A (en) | 2004-06-02 |
| CN1266901C true CN1266901C (en) | 2006-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02152502 Expired - Fee Related CN1266901C (en) | 2002-11-14 | 2002-11-14 | A call flow setting up method |
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| Country | Link |
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| CN (1) | CN1266901C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108848116A (en) * | 2018-09-05 | 2018-11-20 | 中国联合网络通信集团有限公司 | call recording method, device and storage medium |
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| CN100407854C (en) * | 2004-07-31 | 2008-07-30 | 华为技术有限公司 | Audio playing back method in wideband CDMA communication system |
| WO2007059650A1 (en) * | 2005-11-25 | 2007-05-31 | Zte Corporation | A media gateway system and a method for achieving the internal calling of the media gateway |
| CN1984177B (en) * | 2006-04-14 | 2011-04-06 | 华为技术有限公司 | System and method for realizing color bell service |
| CN100531467C (en) * | 2006-05-09 | 2009-08-19 | 华为技术有限公司 | Calling method based on Internet protocol baring |
| CN101056282B (en) * | 2006-06-20 | 2010-05-12 | 华为技术有限公司 | Implementation method, device and system of the random channel signaling under the H.248 separated architecture |
| CN101132348B (en) * | 2006-08-22 | 2011-05-25 | 中兴通讯股份有限公司 | Method for implementing IMS distinguished ring business by SIP signaling expansion |
| CN100461968C (en) * | 2006-09-29 | 2009-02-11 | 华为技术有限公司 | Method, system and media gateway for obtaining dialing number information |
| CN100452786C (en) * | 2006-10-16 | 2009-01-14 | 武汉市中光通信公司 | Large compositive gateway access system based on NGN |
| CN101207547B (en) * | 2006-12-20 | 2011-05-25 | 曲锐 | System and method for implementing intercommunication of public switched telephone network and IP network |
| CN101247313B (en) * | 2007-02-13 | 2010-11-10 | 中兴通讯股份有限公司 | Out-trunk call establishment method |
| CN101123593B (en) * | 2007-09-20 | 2010-06-09 | 中兴通讯股份有限公司 | Method for streaming implementation in media gateway control |
| CN100589610C (en) * | 2007-10-10 | 2010-02-10 | 中兴通讯股份有限公司 | Method and system of suppressing rings in mobile communication service |
| CN108833441B (en) * | 2018-07-23 | 2021-02-02 | 中国联合网络通信集团有限公司 | Method and system for releasing temporary termination point |
| CN111405131B (en) * | 2020-03-30 | 2021-04-20 | 深圳震有科技股份有限公司 | Method, system and storage medium for detecting far-end off-hook signal |
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2002
- 2002-11-14 CN CN 02152502 patent/CN1266901C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108848116A (en) * | 2018-09-05 | 2018-11-20 | 中国联合网络通信集团有限公司 | call recording method, device and storage medium |
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| CN1501650A (en) | 2004-06-02 |
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