CN102098396B - Method for realizing completion of call to busy subscriber for access gateway system based on media gateway control protocol - Google Patents
Method for realizing completion of call to busy subscriber for access gateway system based on media gateway control protocol Download PDFInfo
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Abstract
The invention relates to a method for realizing completion of a call to a busy subscriber for an access gateway system based on a media gateway control protocol. The method comprises the following steps of: after a media gateway controller detects hang-up of a called user, ordering a gateway A to set the resource attribute of a calling user; and ordering a gateway B to modify a corresponding attribute in a session description protocol of a called user according to the resource attribute of the calling user. By the method for realizing completion of the call to the busy subscriber for the access gateway system based on the media gateway control protocol, a soft switch media gateway controller does not immediately release but modifies the real-time protocol (rtp) resource of the called userafter the called user hangs up, and the rtp resource can be directly applied to communication with the calling user, so that the process for releasing and redistributing the rtp resource in the priorart is eliminated, signaling message interaction in the method is reduced, the flow of a completion of call to the busy subscriber service is optimized, network flow and gateway load in a function realization process are reduced, and the stability of a gateway system is ensured.
Description
Technical field
The present invention relates to communication technique field, particularly in the gateway access system based on the means of communication field of MGCP, specifically refer in a kind of gateway access system to realize based on MGCP the method for calling back when busy function.
Background technology
VoIP (Voice over Internet Protocol) is a kind of based on IP phone, transmits at the enterprising lang sound of the network that has used Internet protocol, and releases the technology of corresponding value-added service.The voip network phone is a kind of more advanced, more reliable emerging communication technology, has the development trend that progressively replaces conventional communication techniques.The networking telephone is just merging the Internet and conventional communication techniques is come into daily life, leads new life style.VoIP is exactly with simulated sound signal (Voice) digitlization in brief, the technology of transmitting in real time at IP data network (IP Network) with the pattern of data packet (Data Packet).The advantage of VoIP maximum is to adopt the environment of Internet and global ip interconnection widely, and, better service more than traditional business are provided.VoIP can provide cheap business such as transmission voice, fax, video and data in IP network, stores the storage forwarding of forwarding and various information etc. as unified message, virtual telephony, virtual speech/fax mailbox, directory enquiry service, Internet call center, Internet call manager, video conference, ecommerce, fax.
AG (Access Gateway, IAD) is positioned at the edge access layer in the middle of the soft-exchange construction, and the analog subscriber line interface is provided, and is used for directly ordinary telephone subscriber being linked into soft exchanging network.AG is positioned over the residential quarter or the business data net inserts side, AG or IAD (Integrated Access Device, integrated access device) by MGCP/H.248 agreement (Media GatewayControl Protocol, MGCP) carries out alternately with soft switch, realize that soft switch is to user's calling control, AG realizes the encoding and decoding (simulated voice is broken into the IP bag) of voice simultaneously, the packing compression of Media Stream, quiet detection, basic playback medium gateway function such as collect the digits, realize the Media Stream intercommunication between POTS (Plain Old Telephone Service, traditional plain old telephone service) user and other user.The user is many in a set of regions, and when the twisted-pair feeder resource was arranged again, the application of AG had high performance price ratio.Adopt AG as access way.The capacity that is applicable to is bigger, and the occasion that the user comparatively concentrates is as the speech access of intensive residential quarter and enterprise.
H.248 agreement is the MGCP that was proposed by ITU-T the 16th working group in 2000, and it is to improve in early days the MGCP agreement basis to form.H.248/MeGaCo agreement is for connecting the gateway control protocol of MGC (Media Gateway Controller) with MG (media gateway), being applied between media gateway and the Softswitch and soft switch and H.248/MeGaCo between the terminal, is the important protocol that soft switch should be supported.H.248/MeGaCo agreement is the product that gateway separates concept.The core that gateway separates is that business is separated with control, and control separates with carrying.But make business, control and carrying independent development like this, operator also can provide colourful business when taking full advantage of new technology, promotes network value by the business of constantly bringing forth new ideas.H.248/Megaco be on the basis of MGCP agreement (RFC2705 definition), develop a kind of agreement that forms in conjunction with other MGCP characteristics, it provides foundation, modification and the releasing mechanism of control medium, simultaneously also portability some with the road call signaling, support the calling of legacy network terminal.This agreement is being brought into play important effect making up the open and net among the NGN (New Generation Network, new generation network) that merges more.
After the user handles call back on busy service, be the other side phone when the user dials, during subscriber engaged, the user can press (R) key, hear dialing tone after, dial again * 59# hear confirm voice after, user's on-hook is waited for.When the other side is idle, will behind calling subscriber's off-hook, listen ring-back tone to caller and the other user's ring, treat can converse when the other side has the people to answer.
But in the implementation method of present calling back when busy function, the call back on busy service flow process is too complicated, signaling message is too many alternately, generally below a gateway controller, managing thousands of up to a hundred IADs, if the user is too many, the application meeting of calling back when busy function obviously increases the flow of network and the load of gateway, to the stability generation harmful effect of whole gateway access system.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of and can effectively simplify the call back on busy service flow process, the signaling message that reduces in this function implementation procedure is mutual, thereby reduction gateway load, guarantee the stability of gateway access system, and application mode is simple, and range of application realizes the method for calling back when busy function comparatively widely in the gateway access system based on MGCP.
In order to realize above-mentioned purpose, realize based on MGCP that the method for calling back when busy function has in the gateway access system of the present invention and may further comprise the steps:
When (1) calling subscriber called out the called subscriber, the called subscriber conversed, and the calling subscriber sends to Media Gateway Controller and confirms to enter the calling back when busy status command, and on-hook;
(2) after Media Gateway Controller detected called subscriber's on-hook, the instruction gateway A was set calling subscriber's Resource Properties;
(3) gateway A is back to Media Gateway Controller with the calling subscriber's that sets Resource Properties;
(4) Media Gateway Controller instruction gateway B is according to the respective attributes in the calling subscriber's who obtains the Resource Properties modification called subscriber Session Description Protocol;
(5) Media Gateway Controller instructs gateway A and gateway B to send ring back tone to calling subscriber and called subscriber respectively;
(6) calling subscriber and called subscriber's off-hook, conversation is set up.
Realize in the method for calling back when busy function based on MGCP in this gateway access system that described MGCP is MGCP H.248/MeGaCo.
Realize that based on MGCP described step (1) specifically may further comprise the steps in the method for calling back when busy function in this gateway access system:
(11) gateway A detects calling subscriber's off-hook, and receives calling subscriber's dialing;
(12) gateway A sends to Media Gateway Controller with calling subscriber's dialing;
(13) Media Gateway Controller instruction gateway A is set calling subscriber's Resource Properties;
(14) after the information that Media Gateway Controller acquisition called subscriber is conversing, forward the call to the media server;
(15) Media Gateway Controller instruction gateway A is revised calling subscriber's Resource Properties;
(16) Media Gateway Controller obtains the dialing that affirmation that the calling subscriber sends enters the calling back when busy function;
(17) calling subscriber's on-hook.
Realize that based on MGCP described step (11) specifically may further comprise the steps in the method for calling back when busy function in this gateway access system:
(11a) gateway A detects calling subscriber's off-hook, and sends calling subscriber's off-hook notification information to Media Gateway Controller;
(11b) Media Gateway Controller instruction gateway A is play dialing tone, detects calling subscriber's dialing, and to gateway A Sending dialled number rule;
(11c) gateway A detects calling subscriber's dialing, and collects number.
Realize that based on MGCP described step (16) specifically may further comprise the steps in the method for calling back when busy function in this gateway access system:
(16a) media server is play upright busy tone to the calling subscriber;
(16b) calling subscriber is by after redialing, and media server is play dialing tone to the calling subscriber;
(16c) calling subscriber confirms to enter the calling back when busy state by dialing;
(16d) media server is play Acknowledgement Tone to the calling subscriber.
Realize that based on MGCP described step (2) specifically may further comprise the steps in the method for calling back when busy function in this gateway access system:
(21) gateway B detects called subscriber's on-hook, and called subscriber's on-hook signal is sent to Media Gateway Controller;
(22) Media Gateway Controller instruction gateway B detects called subscriber's off-hook;
(23) Media Gateway Controller instruction gateway A is set calling subscriber's Resource Properties.
Realize that based on MGCP described step (5) specifically may further comprise the steps in the method for calling back when busy function in this gateway access system:
(51) Media Gateway Controller instruction gateway A sends ring back tone to the calling subscriber;
(52) Media Gateway Controller instruction gateway B sends ring back tone to the called subscriber, and revises called subscriber's Resource Properties.
Realize that based on MGCP described step (6) specifically may further comprise the steps in the method for calling back when busy function in this gateway access system:
(61) gateway A detects calling subscriber's off-hook, and calling subscriber's off hook signal is sent to Media Gateway Controller;
(62) Media Gateway Controller instruction gateway A detects calling subscriber's on-hook, and to calling subscriber's playing RBT;
(63) gateway B detects called subscriber's off-hook, and called subscriber's off hook signal is sent to Media Gateway Controller;
(64) Media Gateway Controller instruction gateway B detects called subscriber's on-hook;
(65) conversation is set up between calling subscriber and called subscriber.
Realize that based on MGCP described Resource Properties comprises physical terminal Resource Properties and RTP temporary resource attribute in the method for calling back when busy function in this gateway access system.
Adopted the method that realizes the calling back when busy function in the gateway access system of this invention based on MGCP, because it is after called subscriber's on-hook, soft switch does not discharge called subscriber's real-time transmission protocol resource immediately, but modification association attributes, it can be directly used in and the communicating by letter of calling subscriber, discharge in the prior art and the process of reallocation real-time transmission protocol resource thereby saved, it is mutual to have reduced the signaling message in the method, optimized the flow process of call back on busy service, reduce flow and the gateway load of network in this function implementation procedure, guaranteed the stability of gateway system.And realize the method for calling back when busy function in the gateway access system of the present invention based on MGCP, its application mode is simple, and range of application is comparatively extensive.
Description of drawings
Fig. 1 is the flow chart of steps that realizes the method for calling back when busy function in the gateway access system of the present invention based on MGCP.
Fig. 2 is the signaling message interaction diagrams of realizing the method for calling back when busy function in the gateway access system of the present invention based on MGCP.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
See also shown in Figure 1, for realize the flow chart of steps of the method for calling back when busy function in the gateway access system of the present invention based on MGCP.
In one embodiment, this method may further comprise the steps:
When (1) calling subscriber called out the called subscriber, the called subscriber conversed, and the calling subscriber sends to Media Gateway Controller and confirms to enter the calling back when busy status command, and on-hook;
(2) after Media Gateway Controller detected called subscriber's on-hook, the instruction gateway A was set calling subscriber's Resource Properties;
(3) gateway A is back to Media Gateway Controller with the calling subscriber's that sets Resource Properties;
(4) Media Gateway Controller instruction gateway B is according to the respective attributes in the calling subscriber's who obtains the Resource Properties modification called subscriber Session Description Protocol;
(5) Media Gateway Controller instructs gateway A and gateway B to send ring back tone to calling subscriber and called subscriber respectively;
(6) calling subscriber and called subscriber's off-hook, conversation is set up.
Wherein, described MGCP is MGCP H.248/MeGaCo, and described Resource Properties comprises physical terminal Resource Properties and RTP temporary resource attribute.
In a kind of more preferably execution mode, described step (1) specifically may further comprise the steps:
(11) gateway A detects calling subscriber's off-hook, and receives calling subscriber's dialing;
(12) gateway A sends to Media Gateway Controller with calling subscriber's dialing;
(13) Media Gateway Controller instruction gateway A is set calling subscriber's Resource Properties;
(14) after the information that Media Gateway Controller acquisition called subscriber is conversing, forward the call to the media server;
(15) Media Gateway Controller instruction gateway A is revised calling subscriber's Resource Properties;
(16) Media Gateway Controller obtains the dialing that affirmation that the calling subscriber sends enters the calling back when busy function;
(17) calling subscriber's on-hook.
More preferably in the execution mode, described step (2) specifically may further comprise the steps at another kind:
(21) gateway B detects called subscriber's on-hook, and called subscriber's on-hook signal is sent to Media Gateway Controller;
(22) Media Gateway Controller instruction gateway B detects called subscriber's off-hook;
(23) Media Gateway Controller instruction gateway A is set calling subscriber's Resource Properties.
More preferably in the execution mode, described step (5) specifically may further comprise the steps at another:
(51) Media Gateway Controller instruction gateway A sends ring back tone to the calling subscriber;
(52) Media Gateway Controller instruction gateway B sends ring back tone to the called subscriber, and revises called subscriber's Resource Properties.
More preferably in the execution mode, described step (6) specifically may further comprise the steps at another:
(61) gateway A detects calling subscriber's off-hook, and calling subscriber's off hook signal is sent to Media Gateway Controller;
(62) Media Gateway Controller instruction gateway A detects calling subscriber's on-hook, and to calling subscriber's playing RBT;
(63) gateway B detects called subscriber's off-hook, and called subscriber's off hook signal is sent to Media Gateway Controller;
(64) Media Gateway Controller instruction gateway B detects called subscriber's on-hook;
(65) conversation is set up between calling subscriber and called subscriber.
In a kind of preferred execution mode, described step (11) specifically may further comprise the steps:
(11a) gateway A detects calling subscriber's off-hook, and sends calling subscriber's off-hook notification information to Media Gateway Controller;
(11b) Media Gateway Controller instruction gateway A is play dialing tone, detects calling subscriber's dialing, and to gateway A Sending dialled number rule;
(11c) gateway A detects calling subscriber's dialing, and collects number.
In the preferred execution mode of another kind, described step (16) specifically may further comprise the steps:
(16a) media server is play upright busy tone to the calling subscriber;
(16b) calling subscriber is by after redialing, and media server is play dialing tone to the calling subscriber;
(16c) calling subscriber confirms to enter the calling back when busy state by dialing;
(16d) media server is play Acknowledgement Tone to the calling subscriber.
In an application of the invention, realize the method for calling back when busy function in the gateway access system of the present invention based on MGCP, as shown in Figure 2, its signaling message interaction flow may further comprise the steps substantially:
(1) calling subscriber A off-hook after MG-A (IAD A) detects off-hook event, reports notify (notice) message to tell soft switch MGC (soft exchanging network gateway controller) user A off-hook.
(2) MGC response reply (answer) message.
(3) MGC issues modify (modification) message, allows MG-A detect the subscriber dialing event, and plays dialing tone, issues dialing rule.
(4) MG-A response reply message.
(5) subscriber dialing is finished, and the MG-A end that collects the digits reports the number of collection.
(6) MGC response reply message.
(7) MGC issues ADD (interpolation) message, allows MG-A distribute physics terminal resource and rtp (RTP) temporary resource.
(8) the MG-A Resources allocation finishes, and reports the reply response message.
(9) MGC learns that the other user B converses, and the calling of calling subscriber A is forwarded to MS (media server), plays upright busy tone to calling subscriber A.MGC sends ADD message to MS, allows MS distribute related resource.
(10) after the MS Resources allocation finishes, response reply message.
(11) MGC issues modify message, allows MG-A revise the attribute of rtp temporary resource.
(12) after MG-A revises and finishes, response reply message.
(13) MGC issues modify message, revises the attribute of rtp temporary resource.
(14) after modification finishes, response reply message.
MS plays upright busy tone to calling subscriber A then.After calling subscriber A hears, determine to use call back on busy service, press the R key, hear dialing tone after, dial * 59# again, hear Acknowledgement Tone after, on-hook.(omitting the signalling interactive process of on-hook herein).
(15) the other user B on-hook, MG-B (IAD B) reports notify message, reports detected onhook event.
(16) MGC response reply message, the calling subscriber of MGC analysis simultaneously A once attempted the conversation with the other user B, initiated the calling back when busy flow process.
(17) MGC issues modify message to MG-B, allows MG-B detect the off-hook event of the other user B.
(18) MG-B response reply message.
(19) MGC allows MG-A distribute physics terminal resource and rtp temporary resource for calling subscriber A.
(20) assigned after, MG-A response reply message.
(21) MGC issues modify message to MG-B, does not discharge the related resource of the other user B, but revises the content that SDP (Session Description Protocol) information reports for calling subscriber A, is used for the conversation with calling subscriber A.
(22) MG-B response reply message.
(23) MGC issues modify message to MG-B, allows MG-B to the other user B playing ringing tone.
(24) MG-B response reply message.
(25) MGC issues modify message to MG-A, allows MG-A to calling subscriber A playing ringing tone and revises far-end rtp information.
(26) MG-A response reply message.
(27) MG-A detects the off-hook of calling subscriber A, reports off-hook event.
(28) MGC response reply message.
(29) MGC issues modify message to MG-A, and the spring event is inserted in the on-hook, the bat that allow MG-A detect calling subscriber A, and to calling subscriber A playing RBT.
(30) MG-A response reply message.
(31) MG-B detects the off-hook of the other user B, reports off-hook event.
(32) MGC response reply message.
(33) MGC issues modify message to MG-B, and the spring event is inserted in the on-hook, the bat that allow MG-B detect the other user B.
(34) MG-B response reply message.
At this moment, calling subscriber A and the other user B are in the conversation.Because, do not discharge the related resource of the other user B in (17), in (21) step, but directly revise its association attributes, be used for the conversation with calling subscriber A, thereby the release of rtp resource of the other user B and the process of reallocation have been saved, reduce the message number in the network, optimized the flow process of call back on busy service.
Adopted the method that realizes the calling back when busy function in the gateway access system of this invention based on MGCP, because it is after called subscriber's on-hook, the soft switch Media Gateway Controller does not discharge called subscriber's real-time transmission protocol resource immediately, but modification association attributes, it can be directly used in and the communicating by letter of calling subscriber, discharge in the prior art and the process of reallocation real-time transmission protocol resource thereby saved, it is mutual to have reduced the signaling message in the method, optimized the flow process of call back on busy service, reduce flow and the gateway load of network in this function implementation procedure, guaranteed the stability of gateway system.And realize the method for calling back when busy function in the gateway access system of the present invention based on MGCP, its application mode is simple, and range of application is comparatively extensive.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (8)
1. realize the method for calling back when busy function in the gateway access system based on MGCP, it is characterized in that described method may further comprise the steps:
When (1) calling subscriber called out the called subscriber, the called subscriber conversed, and the calling subscriber sends to Media Gateway Controller and confirms to enter the calling back when busy status command, and on-hook; Specifically may further comprise the steps:
(11) gateway A detects calling subscriber's off-hook, and receives calling subscriber's dialing;
(12) gateway A sends to Media Gateway Controller with calling subscriber's dialing;
(13) Media Gateway Controller instruction gateway A is set calling subscriber's Resource Properties;
(14) after the information that Media Gateway Controller acquisition called subscriber is conversing, forward the call to the media server;
(15) Media Gateway Controller instruction gateway A is revised calling subscriber's Resource Properties;
(16) Media Gateway Controller obtains the dialing that affirmation that the calling subscriber sends enters the calling back when busy function;
(17) calling subscriber's on-hook;
(2) after Media Gateway Controller detected called subscriber's on-hook, the instruction gateway A was set calling subscriber's Resource Properties;
(3) gateway A is back to Media Gateway Controller with the calling subscriber's that sets Resource Properties;
(4) Media Gateway Controller instruction gateway B is according to the respective attributes in the calling subscriber's who obtains the Resource Properties modification called subscriber Session Description Protocol;
(5) Media Gateway Controller instructs gateway A and gateway B to send ring back tone to calling subscriber and called subscriber respectively;
(6) calling subscriber and called subscriber's off-hook, conversation is set up.
2. realize the method for calling back when busy function in the gateway access system according to claim 1 based on MGCP, it is characterized in that described MGCP is MGCP H.248/MeGaCo.
3. realize the method for calling back when busy function in the gateway access system according to claim 2 based on MGCP, it is characterized in that described step (11) specifically may further comprise the steps:
(11a) gateway A detects calling subscriber's off-hook, and sends calling subscriber's off-hook notification information to Media Gateway Controller;
(11b) Media Gateway Controller instruction gateway A is play dialing tone, detects calling subscriber's dialing, and to gateway A Sending dialled number rule;
(11c) gateway A detects calling subscriber's dialing, and collects number.
4. realize the method for calling back when busy function in the gateway access system according to claim 2 based on MGCP, it is characterized in that described step (16) specifically may further comprise the steps:
(16a) media server is play upright busy tone to the calling subscriber;
(16b) calling subscriber is by after redialing, and media server is play dialing tone to the calling subscriber;
(16c) calling subscriber confirms to enter the calling back when busy state by dialing;
(16d) media server is play Acknowledgement Tone to the calling subscriber.
5. realize the method for calling back when busy function in the gateway access system according to claim 1 based on MGCP, it is characterized in that described step (2) specifically may further comprise the steps:
(21) gateway B detects called subscriber's on-hook, and called subscriber's on-hook signal is sent to Media Gateway Controller;
(22) Media Gateway Controller instruction gateway B detects called subscriber's off-hook;
(23) Media Gateway Controller instruction gateway A is set calling subscriber's Resource Properties.
6. realize the method for calling back when busy function in the gateway access system according to claim 1 based on MGCP, it is characterized in that described step (5) specifically may further comprise the steps:
(51) Media Gateway Controller instruction gateway A sends ring back tone to the calling subscriber;
(52) Media Gateway Controller instruction gateway B sends ring back tone to the called subscriber, and revises called subscriber's Resource Properties.
7. realize the method for calling back when busy function in the gateway access system according to claim 1 based on MGCP, it is characterized in that described step (6) specifically may further comprise the steps:
(61) gateway A detects calling subscriber's off-hook, and calling subscriber's off hook signal is sent to Media Gateway Controller;
(62) Media Gateway Controller instruction gateway A detects calling subscriber's on-hook, and to calling subscriber's playing RBT;
(63) gateway B detects called subscriber's off-hook, and called subscriber's off hook signal is sent to Media Gateway Controller;
(64) Media Gateway Controller instruction gateway B detects called subscriber's on-hook;
(65) conversation is set up between calling subscriber and called subscriber.
8. according to the method that realizes the calling back when busy function in each described gateway access system in the claim 1 to 7 based on MGCP, it is characterized in that described Resource Properties comprises physical terminal Resource Properties and RTP temporary resource attribute.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1929519A (en) * | 2006-08-16 | 2007-03-14 | 华为技术有限公司 | Method and system for realizing busy prompting service |
| CN101217598A (en) * | 2007-01-04 | 2008-07-09 | 中国移动通信集团公司 | A call-back method and system in busy circumstances |
| CN101304605A (en) * | 2007-05-10 | 2008-11-12 | 中兴通讯股份有限公司 | Method for implementing reanswer call |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1929519A (en) * | 2006-08-16 | 2007-03-14 | 华为技术有限公司 | Method and system for realizing busy prompting service |
| CN101217598A (en) * | 2007-01-04 | 2008-07-09 | 中国移动通信集团公司 | A call-back method and system in busy circumstances |
| CN101304605A (en) * | 2007-05-10 | 2008-11-12 | 中兴通讯股份有限公司 | Method for implementing reanswer call |
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