CN102340605B

CN102340605B - Method and device for cancelling echoes

Info

Publication number: CN102340605B
Application number: CN 201110209015
Authority: CN
Inventors: 李云飞; 孙联峰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2011-07-25
Filing date: 2011-07-25
Publication date: 2013-06-05
Anticipated expiration: 2031-07-25
Also published as: WO2012119499A1; CN102340605A

Abstract

The embodiment of the invention provides a method and device for cancelling echoes and relates to the technical field of communication. The method for cancelling echoes comprises the following steps of: receiving information carrying access classification of an opposite terminal user from an opposite terminal network element by a local terminal network element; judging whether an echo canceller (EC) needs to be added during establishing load bearing by the local terminal network element according to the access classification of the opposite terminal user and the access classification of a local terminal user; and judging that the echo canceller (EC) needs to be added, adding the echo canceller (EC) during establishing load bearing at a local terminal or opposite terminal. With the help of the method and device for cancelling echoes provided by the embodiment of the invention, the problem of adding the EC of IMS (Information Management System) while calling is solved.

Description

A kind of method and apparatus of eliminating echo

Technical field

The present invention relates to communication technical field, relate in particular to a kind of method and apparatus of eliminating echo.

Background technology

Echo has electric echo and acoustic echo.Acoustic echo is caused by the emission of the other side's sound of mobile phone, main armrest machine self solution.Electric echo is to be caused by the hybrid coil that is used for 2/4 line conversion in public switched telephone network (Public Switch Telephone Network, PSTN), mainly solves by the echo canceller (Echo Canceller, EC) in the network equipment.

Call out between mobile subscriber and fixed-line subscriber, due to the reason of eating dishes without rice or wine, postpone to strengthen, make echo apparent in view, need to add EC.The network of calling out between traditional mobile subscriber and fixed-line subscriber is comprised of mobile end office (EO), mobile gateway office, fixed network gateway exchange and fixed network end office (EO).Call out to need to add EC by the gateway exchange between mobile network and fixed network like this by mobile gateway office and fixing gateway exchange.Add EC such as approximately fixing on fixedly gateway exchange, on fixing gateway exchange and the relaying that docks of mobile gateway office all be configured to add EC, like this, for from mobile gateway office, perhaps go to the calling of mobile gateway office, fixedly gateway exchange all can add EC; Perhaps, go to the calling of mobile gateway office, fixedly gateway exchange all can add EC.Also can approximately fix on the mobile gateway interpolation EC of office.

Along with the development of network, mobile and fixedly fusion become gradually trend.By the mobile subscriber is called out, perhaps the fixed-line subscriber call proceeding is to IP Multimedia System (IP Multimedia Subsystem, IMS), and namely call anchoring to IMS, is provided according to abundant business by IMS.In this case, can't configure interpolation EC as legacy network on given trunk.A kind of scheme also is not provided in prior art, solves call proceeding to the EC interpolation problem of IMS.

Summary of the invention

The embodiment of the present invention provides a kind of method and apparatus of eliminating echo, can solve flexibly call proceeding to the EC interpolation problem of IMS.

According to an aspect of the present invention, provide a kind of method of eliminating echo, having comprised:

The local terminal network element receives the message of carrying the opposite end user access type that the opposite end network element sends;

The local terminal network element is according to opposite end user access type and local terminal user access type, and whether judgement needs to add echo canceller EC when setting up carrying;

When needs add described echo canceller EC, add described echo canceller EC when local terminal or opposite end foundation carrying.

According to a further aspect in the invention, provide a kind of equipment of eliminating echo, having comprised:

The first receiving element is used for receiving the message of carrying the opposite end user access type that the opposite end network element sends;

Judging unit is used for according to opposite end user access type and local terminal user access type, and whether judgement needs to add echo canceller EC when setting up carrying;

Determining unit is used for when needs add described echo canceller EC, determines to add described echo canceller EC when local terminal or opposite end foundation carrying.

The method and apparatus of the elimination echo that the embodiment of the present invention provides is after the message of carrying the opposite end user access type that receives opposite end network element transmission; The local terminal network element is according to opposite end user access type and local terminal user access type, and whether judgement needs to add echo canceller EC when setting up carrying; When needs add described echo canceller EC, add described echo canceller EC when local terminal or opposite end foundation carrying.Thereby, solved flexibly the EC interpolation problem of call proceeding to IMS.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, during the below will describe embodiment, the accompanying drawing of required use is done an introduction simply, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

A kind of method flow diagram of eliminating echo that Fig. 1 provides for the embodiment of the present invention;

The another kind that Fig. 2 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

The another kind that Fig. 3 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

The another kind that Fig. 4 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

The another kind that Fig. 5 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

The another kind that Fig. 6 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

The another kind that Fig. 7 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

The another kind that Fig. 8 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

The another kind that Fig. 9 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

The another kind that Figure 10 provides for the embodiment of the present invention is eliminated the method flow diagram of echo;

A kind of structural representation of eliminating the equipment of echo that Figure 11 provides for the embodiment of the present invention;

The another kind that Figure 12 provides for the embodiment of the present invention is eliminated the structural representation of the equipment of echo;

The another kind that Figure 13 provides for the embodiment of the present invention is eliminated the structural representation of the equipment of echo.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

Circuit domain user (comprising mobile subscriber and fixed-line subscriber) call proceeding is mainly contained two kinds of methods to IMS.

A kind of call proceeding is the intelligence number of changing anchored mode to the method for IMS.Intelligent protocol has defined mutual between Service Switching Point (Service Switching Point, SSP) and service control point (Service Control Point, SCP), is widely used in the prepaid user.The intelligent call principle is to assemble trigger in SSP for intelligent subscriber, defined a series of DP (Detection Point) point in calling procedure, when calling runs to this DP point, SSP detects the user and whether has assembled corresponding trigger, if be equipped with corresponding trigger carry out corresponding Intelligent treatment, send a message to SCP, according to the response continuation subsequent operation of SCP.SSP is the tie point that connects existing mobile network and intelligent network.The intelligence number of changing anchored mode is exactly to the signing intelligent contactor of circuit domain grappling user, when the user calls out, switch is by intelligent trigger and SCP exchange, the SCP here is actual is the grappling number of changing equipment, return to switch after the grappling number of changing apparatus modifications called number, switch is called to IMS according to amended number.This number of changing anchored mode need to pass through MGCF (Media Gateway Control Function, MGCF), and MGCF is the internetwork interface network element of IMS network and traditional circuit domain.

Calling procedure is briefly described as follows:

The mobile subscriber makes a call, and after the number of changing, calls out by mobile gateway office and is routed to MGCF, MGCF is called to IMS again (if fixed-line subscriber makes a call, after the number of changing, call out and be routed to MGCF by the fixed network gateway exchange, MGCF is called to IMS again).

IMS handles customer service, if called be circuit domain user, IMS can be called to MGCF.Be called to mobile network or fixed network by MGCF.

Wherein, MGCF can close with gateway exchange and establish, i.e. the MGCF double mobile gateway office of doing, the perhaps double fixed network gateway exchange of doing of MGCF simultaneously.

Another kind of call anchoring is transformation end office (EO) to the method for IMS.

If the transformation and upgrade of mobile end office (EO) are mAGCF (mobile Access Gateway Control Function, Mobile Access Gateway is controlled function), mAGCF is modeled as session initiation protocol (Session Initiation Protocol, SIP) user to the mobile subscriber and registers to IMS.Subsequent movement user makes a call, the service call conversation control function (Serving Call Session Control Function, S-CSCF) of record when directly sending INVITE to registration by mAGCF.The mobile subscriber does called, and IMS handles customer service, by S-CSCF, INVITE is sent to mAGCF.

If fixedly end office's transformation and upgrade are AGCF, AGCF is modeled as sip user to fixed-line subscriber and registers to IMS.Follow-up fixed-line subscriber makes a call, the S-CSCF of record when directly sending INVITE to registration by AGCF.Fixed-line subscriber is done called, and IMS handles customer service, by S-CSCF, INVITE is sent to AGCF.

As shown in Figure 1, a kind of method of eliminating echo that the embodiment of the present invention provides comprises:

S11, the local terminal network element receives the message of carrying the opposite end user access type that the opposite end network element sends;

S13, local terminal network element are according to opposite end user access type and local terminal user access type, and whether judgement needs to add echo canceller EC when setting up carrying;

Wherein, according to opposite end user access type and local terminal user access type, whether judgement adds EC when setting up carrying, specifically comprises at least a in following several situation certainly also being not limited to these:

(1) if local terminal user access type and opposite end user access type are all the mobile subscribers, do not need to add EC when setting up carrying;

(2) if the opposite end user access type is the mobile subscriber, the local terminal user access type is fixed-line subscriber, need to add EC when setting up carrying;

(3) if the opposite end user access type is fixed-line subscriber, the local terminal user access type is the mobile subscriber, need to add EC when setting up carrying.

S15 when needs add described echo canceller EC, adds described echo canceller EC when local terminal or opposite end foundation carrying.

Concrete, S15 comprises at least a in following situation:

(1) if the opposite end user access type is the mobile subscriber, described local terminal user access type is fixed-line subscriber, need to add EC when local terminal is set up carrying.

Concrete, if the opposite end user access type is the mobile subscriber, the local terminal user access type is fixed-line subscriber, the local terminal network element adds EC when notice local terminal media gateway (Media Gateway, MGW) is set up carrying so.

(2) if the opposite end user access type is fixed-line subscriber, described local terminal user access type is the mobile subscriber, adds EC when setting up carrying in the opposite end.

Concrete, if described opposite end user access type is fixed-line subscriber, described local terminal user access type is the mobile subscriber, and the local terminal network element does not add EC when notice local terminal MGW sets up carrying, and opposite end network element notice opposite end MGW adds EC when setting up carrying.

(3) if the opposite end user access type is the mobile subscriber, the local terminal user access type is fixed-line subscriber, and the EC inadequate resource of local terminal, adds EC when setting up carrying in the opposite end.

Wherein, the local terminal network element can judge local terminal EC inadequate resource through but not limited to following method: 1, local terminal does not configure the EC resource; 2, local terminal has the individual EC resource of N (N is more than or equal to 1), but N EC resource all used; 3, the local terminal network element is after the MOD Req message that sends to local terminal MGW notifies MGW to add EC, and MGW distributes the failure of EC resource, and MGW adds the EC failure at the response indicating that returns, and the local terminal network element is received the response that MGW returns, and knows that local terminal is without EC.

Optionally, the local terminal network element sends a notification message to the opposite end network element, and notification message carries the indication that local terminal does not add EC.

For example, take the opposite end as Calling Side, local terminal is callee side, and the opposite end user access type is the mobile subscriber, and the local terminal user access type is that fixed-line subscriber is example.The Calling Side network element sends and carries the message of calling subscriber's access style to the callee side network element, the callee side network element is after receiving the message of carrying calling subscriber's access style, if callee side network element judgement callee side EC inadequate resource notifies the callee side media gateway MGW not add EC when setting up carrying.Then, the callee side network element sends and to carry message that callee side do not add EC to the Calling Side network element, and after the Calling Side network element received this message, notice Calling Side MGW added EC when setting up carrying.

(4) if the opposite end user access type is fixed-line subscriber, the local terminal user access type is the mobile subscriber, and the opposite end do not add EC, adds EC when local terminal is set up carrying.

Optionally, the local terminal network element receives the notification message that the opposite end network element sends, and described notification message carries the indication that EC is not added in the opposite end.

For example, take the opposite end as callee side, local terminal is Calling Side, and the opposite end user access type is fixed-line subscriber, and the local terminal user access type is example for the mobile subscriber.The Calling Side network element sends and carries the message of calling subscriber's access style to the callee side network element, the callee side network element is after receiving the message of carrying calling subscriber's access style, the EC inadequate resource of judgement callee side notifies the callee side media gateway MGW not add EC when setting up carrying.Then, the callee side network element sends and to carry message that callee side do not add EC to the Calling Side network element, and after the Calling Side network element received this message, notice Calling Side MGW added EC when setting up carrying.

Wherein, the local terminal in the embodiment of the present invention and opposite end can be respectively callee side and Calling Side, also can be respectively Calling Side and callee side.

Optionally, if the opposite end network element is Calling Side MGCF MGCF, also comprise before step S11: if Calling Side MGCF judgement is called out from the mobile network, the user access type that carries in the message that sends to the local terminal network element of Calling Side MGCF is the mobile subscriber; Or if Calling Side MGCF judgement is called out from fixed network, the user access type that carries in the message that sends to the local terminal network element of Calling Side MGCF is fixed-line subscriber.

The method of the elimination echo that provides by the present embodiment provides a kind of and has solved call proceeding and add scheme to the EC of IMS, can be according to local terminal user access type and opposite end user access type, and solve flexibly call proceeding and add problem to the EC of IMS.

As shown in Figure 2, the embodiment of the present invention is take local terminal as callee side, and the opposite end is Calling Side, and this end subscriber is the mobile subscriber, for the mobile subscriber is example (being that local terminal user access type and opposite end user access type are all the mobile subscribers), provide the method for another kind of elimination echo to end subscriber.The local terminal network element is with callee side MGCF, and the opposite end network element is take Calling Side MGCF as example.

S201, the mobile subscriber makes a call, and Calling Side moves end office (EO) according to intelligent contactor, initiates intelligent trigger request message to SCP.

S202, SCP return to the intelligent trigger response message, wherein carry amended called connection number (for example, in called front increase prefix).

S203, Calling Side move end office (EO) and carry out route according to amended called connection number, are called to Calling Side mobile gateway office.

S204, Calling Side mobile gateway office's transmission initial address message (Initial Address Message, IAM) is given Calling Side MGCF.

S205, Calling Side MGCF judgement is called out from the mobile network, in sending to the INVITE of IMS, carries calling subscriber's access style, and the sign calling subscriber is the mobile subscriber.

Concrete, Calling Side MGCF judges that this side for the method for mobile subscriber or fixed-line subscriber, can be to configure the attribute of each office direction at Calling Side MGCF, is mobile end office (EO), fixedly end office (EO), mobile gateway office or fixing gateway exchange.Calling from mobile end office (EO) or mobile gateway office is exactly that mobile side is called out, and this side is the mobile subscriber; From fixing end office (EO) or fixedly the calling of gateway exchange be exactly that fixation side is called out, this side is fixed-line subscriber.

Here can carry calling subscriber's access style by increase parameter in INVITE.Such as increasing header field parameter: AccessType, on dutyly represent the mobile subscriber during for Mobile, represent fixed-line subscriber when being worth for fix.Example, when the calling subscriber was the mobile subscriber, carrying content of parameter was AccessType:Mobile.Perhaps, increase parameter and carry user access type in existing header field, carry the Calling Side user access type such as increase parameter in the From header field.

S206, IMS handles business, and judging called is the circuit domain mobile subscriber, sends INIVTE message to callee side MGCF, wherein carries calling subscriber's access style, and the sign calling subscriber is the mobile subscriber.

Here can carry calling subscriber's access style by increase parameter in INVITE.

S207, callee side MGCF send IAM to callee side mobile gateway office.Callee side MGCF can determine called subscriber's access style according to out office direction attribute, configures the attribute of each office direction at callee side MGCF, is mobile end office (EO), fixedly end office (EO), mobile gateway office or fixing gateway exchange.The calling that callee side MGCF is called to mobile end office (EO) or mobile gateway office is that mobile side is called out, and this side is the mobile subscriber; Callee side MGCF be called to fixedly end office (EO) or fixedly the calling of gateway exchange be exactly that fixation side is called out, this side is fixed-line subscriber.

S208, callee side mobile gateway office continues called the mobile network.

S209, callee side MGCF sends 183 message to IMS, carries called subscriber's access style, and the sign callee side is the mobile subscriber.Callee side MGCF is according to calling subscriber's access style and called subscriber's access style, and judgement is to call out between the mobile subscriber, and determining does not need to add EC when setting up carrying.When notice callee side MGW builds carrying, do not notify MGW to add the EC resource.Concrete, can for, when callee side MGCF builds carrying at notice callee side MGW, do not carry the indication of EC resource, MGW does not add the EC resource.

Here can carry called subscriber's access style by increase parameter in 183.

S210, IMS sends 183 message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign callee side is the mobile subscriber.Calling Side MGCF is according to calling subscriber's access style and called subscriber's access style, and judgement is to call out between the mobile subscriber, when notice Calling Side MGW builds carrying, does not notify MGW to add the EC resource.

S211, called terminal ringing, after ACM (Address Complete, the complete message in address) from called mobile end office (EO) received in callee side mobile gateway office, callee side mobile gateway office sent ACM to callee side MGCF.

S212, callee side MGCF send 180 message to IMS, wherein carry called subscriber's access style, and the sign callee side is the mobile subscriber.

Here can carry called subscriber's access style by increase parameter in 180.

S213, IMS sends 180 message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign callee side is the mobile subscriber.

S214, Calling Side MGCF is to the Calling Side mobile gateway transmission ACM of office.

S215, Calling Side mobile gateway office moves end office (EO) to Calling Side and sends ACM.

S216, called party answer, after ANM (Answer Message, response message) from called mobile end office (EO) received in callee side mobile gateway office, callee side mobile gateway office sent ANM to callee side MGCF.

S217, callee side MGCF send 200 OK message to IMS, wherein carry called subscriber's access style, and the sign callee side is the mobile subscriber.

Here can carry called subscriber's access style by increase parameter in 200 OK.

S218, IMS sends 200 OK message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign callee side is the mobile subscriber.

S219, Calling Side MGCF is to the Calling Side mobile gateway transmission ANM of office.

S220, Calling Side mobile gateway office moves end office (EO) to Calling Side and sends ANM.

S221, Calling Side MGCF send to IMS and confirm (Acknowledge, ACK) message.

S222, IMS sends ACK message to callee side MGCF.

Separately, in the present embodiment, if local terminal is considered as Calling Side, the opposite end is considered as callee side, and this end subscriber is considered as the mobile subscriber, end subscriber is considered as the mobile subscriber also passable.That is: Calling Side MGCF receives the message of carrying called subscriber's access style that callee side MGCF sends, and Calling Side MGCF is according to calling subscriber's access style and called subscriber's access style, and judgement is to call out between the mobile subscriber, does not need to add EC.Therefore when notice Calling Side MGW builds carrying, do not notify MGW to add the EC resource.

When real network was disposed, MGCF can doublely do gateway exchange.Following schematic diagram is the double gateway exchange of doing of MGCF, and increases carrying foundation processing.

As shown in Figure 3, the embodiment of the present invention is take local terminal as callee side, and the opposite end is Calling Side, and this end subscriber is the mobile subscriber, for the mobile subscriber is example (being that local terminal user access type and opposite end user access type are all the mobile subscribers), provide the method for another kind of elimination echo to end subscriber.In this embodiment, the local terminal network element is with callee side MGCF, and the opposite end network element is take Calling Side MGCF as example, the double caller gateway exchange of doing of Calling Side MGCF wherein, and callee side MGCF is double, and to do called gateway exchange be example.

S301, the mobile subscriber makes a call, and Calling Side moves end office (EO) and obtains the rear called connection number of modification by intelligent interaction.Calling Side moves end office (EO) and carries out route according to amended called connection number, is called to Calling Side MGCF.

S302, Calling Side MGCF send and add destination node request ADD Req message, and notice MGW sets up the IP end points that is used for transferring voice.

S303, MGW returns to ADD Reply and responds to Calling Side MGCF after setting up carrying, wherein carries the IP terminal point information of Calling Side.

S304, Calling Side MGCF judgement is called out from the mobile network, in sending to the INVITE of IMS, increases parameter and carries calling subscriber's access style, and the sign Calling Side is the mobile subscriber.Session Description Protocol in INVITE (Session Description Protocol, SDP) carries Calling Side carrying IP terminal point information.

S305, IMS handles business, and judging called is the circuit domain mobile subscriber, sends INIVTE message to callee side MGCF, wherein carries calling subscriber's access style, and the sign Calling Side is the mobile subscriber.

S306, callee side MGCF send ADD Req message, and notice MGW sets up the IP end points that is used for transferring voice.Wherein carry the SDP information of Calling Side.Callee side MGCF is according to calling subscriber's access style and called subscriber's access style, and judgement is to call out between the mobile subscriber, does not need to add EC when setting up carrying.When notice callee side MGW builds carrying, do not notify MGW to add the EC resource.

S307, MGW returns to ADD Reply and responds to callee side MGCF after setting up carrying, wherein carries the IP terminal point information of callee side.

S308, callee side MGCF and called mobile network carry out alternately, at mobile network's continuing called subscriber.Wherein, callee side MGCF can determine called subscriber's access style according to out office direction attribute, configures the attribute of each office direction at callee side MGCF, is mobile end office (EO), fixedly end office (EO), mobile gateway office or fixing gateway exchange.The calling that callee side MGCF is called to mobile end office (EO) or mobile gateway office is that mobile side is called out, and this side is the mobile subscriber; Callee side MGCF be called to fixedly end office (EO) or fixedly the calling of gateway exchange be exactly that fixation side is called out, this side is fixed-line subscriber.

S309, callee side MGCF sends 183 message to IMS, increases parameter and carries called subscriber's access style, and the sign callee side is the mobile subscriber.Carry callee side SDP in 183 message.

S310, IMS sends 183 message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign callee side is the mobile subscriber.

S311, Calling Side MGCF receives 183 message, obtains callee side SDP information.Send and revise destination node request MOD Req message to MGW, the IP terminal point information of callee side notice MGW.Calling Side MGCF is according to caller access style and called access style, and judgement is to call out between the mobile subscriber, when notice Calling Side MGW revises carrying, does not notify MGW to add the EC resource.

S312 after MGW revises carrying, returns to MOD Reply response message for Calling Side MGCF.

S313, Calling Side MGCF send PRACK message to IMS, and 183 message are confirmed.

S314, IMS send PRACK to callee side MGCF.

S315, callee side MGCF send 200 OK to IMS, and PRACK is confirmed.

S316, IMS send 200 OK to Calling Side MGCF.

After S317, called terminal ringing, callee side MGCF received ACM from mobile end office (EO), callee side MGCF sent 180 message to IMS, wherein carries called subscriber's access style, and the sign callee side is the mobile subscriber.

S318, IMS sends 180 message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign called subscriber is the mobile subscriber.

S319, Calling Side MGCF send PRACK message to IMS, and 180 message are confirmed.

S320, IMS send PRACK to callee side MGCF.

S321, callee side MGCF send 200 OK to IMS, and PRACK is confirmed.

S322, IMS send 200 OK to Calling Side MGCF.

S323, Calling Side MGCF moves end office (EO) to Calling Side and sends ACM.

After S324, called party answer, callee side MGCF received ANM from mobile end office (EO), callee side MGCF sent 200 OK message to IMS, wherein carries called subscriber's access style, and the sign called subscriber is the mobile subscriber.

S325, IMS sends 200 OK message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign called subscriber is the mobile subscriber.

S326, Calling Side MGCF moves end office (EO) to Calling Side and sends ANM.

S327, Calling Side MGCF sends ACK message to IMS.

S328, IMS sends ACK message to callee side MGCF.

The method of the elimination echo that provides by the present embodiment provides a kind of and has solved call proceeding and add scheme to the EC of IMS, can according to local terminal user access type and opposite end user access type, solve flexibly the EC interpolation problem of call anchoring to IMS.

Separately, in the present embodiment, if local terminal is considered as Calling Side, the opposite end is considered as Calling Side, and this end subscriber is considered as the mobile subscriber, end subscriber is considered as the mobile subscriber also passable.That is: Calling Side MGCF receives the message of carrying called subscriber's access style that callee side MGCF sends, Calling Side MGCF is according to calling subscriber's access style and called subscriber's access style, judgement does not need to add EC when setting up carrying, when notice Calling Side MGW builds carrying, do not notify MGW to add the EC resource.

As shown in Figure 4, the embodiment of the present invention is take local terminal as callee side, the opposite end is Calling Side, and this end subscriber is the mobile subscriber, be that fixed-line subscriber is that example (is that the opposite end user access type is fixed-line subscriber to end subscriber, the local terminal user access type is the mobile subscriber), the method for another kind of elimination echo is provided.The local terminal network element is with callee side MGCF (Media Gateway Control Function, MGCF), and the opposite end network element is take Calling Side MGCF as example.

S401, Calling Side MGCF receives the IAM from fixed switch, the minute book side is fixed-line subscriber.

S402, Calling Side MGCF send ADD Req message, and notice Calling Side MGW sets up the IP end points that is used for transferring voice.

S403, MGW returns to ADD Reply and responds to Calling Side MGCF after setting up carrying, wherein carries the IP terminal point information of Calling Side.

S404, Calling Side MGCF judgement is called out from fixed network, in sending to the INVITE of IMS, increases parameter and carries calling subscriber's access style, and the sign Calling Side is fixed-line subscriber.Session Description Protocol in INVITE (Session Description Protocol, SDP) carries Calling Side carrying IP terminal point information.

S405, IMS handles business, and judging called is the circuit domain mobile subscriber, sends INIVTE message to callee side MGCF, wherein carries calling subscriber's access style, and the sign Calling Side is fixed-line subscriber.

S406, callee side MGCF send ADD Req message, and notice MGW sets up the IP end points that is used for transferring voice.Wherein carry the SDP information of Calling Side.Callee side MGCF need to add EC according to calling subscriber's access style and called subscriber's access style when carrying is set up in judgement.This calling is that fixed-line subscriber is called out the mobile subscriber, and this side is the mobile subscriber, when notice MGW builds carrying, does not notify MGW to add the EC resource.

S407-S410 with step S307-S310, repeats no more here.

S411, Calling Side MGCF receives 183 message, judge this side call out for fixing and mobile between call out, this side is fixed-line subscriber, in the MOD Req message that sends to MGW, notifies this side MGW to add the EC resource.

S412-S428 with step S312-S328, repeats no more here.

Separately, in the present embodiment, if local terminal is considered as Calling Side, the opposite end is considered as callee side, and this end subscriber is considered as fixed-line subscriber, end subscriber is considered as the mobile subscriber also passable.That is: Calling Side MGCF receives the message of carrying called subscriber's access style that callee side MGCF sends, and Calling Side MGCF is that fixed-line subscriber and called subscriber's access style are the mobile subscribers according to calling subscriber's access style, need to add EC when carrying is set up in judgement.When notice Calling Side MGW set up carrying, notice MGW added the EC resource.

In the embodiment shown in fig. 4, for the calling between fixed-line subscriber and mobile subscriber, default at fixation side interpolation EC, in some situation, when inadequate, can pass through the signaling negotiation mode such as fixation side EC resource, the calling between fixed-line subscriber and mobile subscriber is added EC in mobile side.

As shown in Figure 5, the present embodiment is take local terminal as callee side, the opposite end is Calling Side, and this end subscriber is the mobile subscriber, be that fixed-line subscriber is example (be that the opposite end user access type is fixed-line subscriber, the local terminal user access type is the mobile subscriber) to end subscriber, the method for another kind of elimination echo is provided, by the signaling negotiation mode, add EC at local terminal.The local terminal network element is with callee side MGCF, and the opposite end network element is take Calling Side MGCF as example.

S501-S510 is with step S401-S410.

S511, Calling Side MGCF receives 183 message, judge this call out for fixing and mobile between call out, this side is fixed-line subscriber.Calling Side MGCF judges this side EC inadequate resource, notifies the Calling Side media gateway MGW not add EC when setting up carrying, namely in the MOD Req message of issuing the MGW transmission, notifies this side MGW not add the EC resource.Here, Calling Side MGCF can judge this side EC inadequate resource through but not limited to following method: 1, this side does not configure the EC resource; 2, this side has the individual EC resource of N (N is more than or equal to 1), but N EC resource all used; 3, after Calling Side MGCF notifies MGW to add EC in sending to the MOD Req message of Calling Side MGW, MGW distributes the failure of EC resource, MGW adds the EC failure at the response indicating of returning for caller MGCF, and Calling Side MGCF receives the response that MGW returns, and knows that this side is without EC.

Follow-up, Calling Side MGCF is by signaling opposite end interpolation EC.See following S5161-S5166.

S512 after MGW revises carrying, returns to MOD Reply response message for Calling Side MGCF.

S513-S516 with step S413-S416, repeats no more here.

S5161, Calling Side MGCF sends a notification message (being UPDATE message here) to IMS, carries parameter and indicates this side not add EC.

S5162, IMS sends UPDATE message to callee side MGCF, carries parameter indication status of calling side and does not add EC.

S5163, callee side MGCF receives UPDATE message, judge this call out for fixing and mobile between call out, callee side be the mobile subscriber, and Calling Side do not add EC, when sending MOD Req message to MGW, notice MGW interpolation EC.

S5164, MGW sends MOD Reply response message to callee side MGCF.

S5165, callee side MGCF receives the response message of MGW, sends 200 OK message to IMS, carries parameter and indicates this side to add EC.

S5166, IMS sends 200 OK to Calling Side MGCF, carries parameter and indicates this side to add EC.

S517-S528 with step S417-S428, repeats no more here.

Optionally, when MGCF and gateway exchange set up separately, if the MGCF judgement needs this side to add EC, can carry out signaling by MGCF and this side gateway exchange and consult, add EC by gateway exchange.

The EC that more than is exemplified as the number of changing anchored mode processes, and mobile end office (EO) is mAGCF for transformation, and transformation fixedly end office (EO) is the EC processing of AGCF, also can adopt above-described embodiment to realize.For mAGCF, its lower user is the mobile subscriber, and is default at mAGCF interpolation EC.Call out between calling out as mobile subscriber and fixed-line subscriber, and fixation side also can notify MGW to add EC when setting up carrying by mAGCF when not adding EC.For AGCF, its lower user is fixed-line subscriber, and is when calling out between calling out as mobile subscriber and fixed-line subscriber, default at AGCF interpolation EC.Also can consult by signaling, add EC by the opposite end.

The method of the elimination echo that provides by the present embodiment provides a kind of and has solved call proceeding and add scheme to the EC of IMS, can be according to local terminal user access type and opposite end user access type, and solve flexibly call proceeding and add problem to the EC of IMS.Separately, in the present embodiment, if local terminal is considered as Calling Side, the opposite end is considered as callee side, and this end subscriber is considered as fixed-line subscriber, end subscriber is considered as the mobile subscriber also passable.That is: Calling Side MGCF receives the message of carrying called subscriber's access style that callee side MGCF sends, and Calling Side MGCF is that fixed-line subscriber and called subscriber's access style are the mobile subscribers according to calling subscriber's access style, need to add EC when carrying is set up in judgement.But the EC inadequate resource of Calling Side MGCF judgement local terminal does not add EC when local terminal is set up carrying.Further, Calling Side MGCF sends a notification message to callee side MGCF, and notification message carries the indication that Calling Side does not add EC, so that EC is added in the opposite end when setting up carrying.

Transform mAGCF as for mobile end office (EO), fixedly end office (EO) transform the EC processing of AGCF as, the invention provides following embodiment.As shown in Figure 6, the embodiment of the present invention is take local terminal as callee side, the opposite end is Calling Side, and this end subscriber is the mobile subscriber, be that fixed-line subscriber is example (be that the opposite end user access type is fixed-line subscriber, the local terminal user access type is the mobile subscriber) to end subscriber, the method for another kind of elimination echo is provided, by the signaling negotiation mode, add EC at local terminal.The local terminal network element is with mAGCF, and the opposite end network element is take AGCF as example.

This embodiment and embodiment shown in Figure 5, difference is, and the opposite end network element in Fig. 5 is caller MGCF, and the local terminal network element is called MGCF.And in this embodiment, because mobile port transform mAGCF as, fixedly end office (EO) transform AGCF as, so is processed by AGCF in Fig. 6 by the action of caller MGCF execution in Fig. 5, and the action of being carried out by called MGCF in Fig. 5 is processed by mAGCF in Fig. 6.

Concrete repeats no more here.

As shown in Figure 7, the present embodiment is take local terminal as callee side, the opposite end is Calling Side, and this end subscriber is fixed-line subscriber, be that example (is that the opposite end user access type is the mobile subscriber to end subscriber for the mobile subscriber, the local terminal user access type is fixed-line subscriber), the method for another kind of elimination echo is provided.The local terminal network element is with callee side MGCF, and the opposite end network element is take Calling Side MGCF as example.

S701, Calling Side MGCF receives the IAM from mobile end office (EO), the minute book side is the mobile subscriber.

S702, Calling Side MGCF send ADD Req message, and notice MGW sets up the IP end points that is used for transferring voice.

S703, MGW returns to ADD Reply and responds to Calling Side MGCF after setting up carrying, wherein carries the IP terminal point information of Calling Side.

S704, Calling Side MGCF judgement is called out from the mobile network, in sending to the INVITE of IMS, increases parameter and carries calling subscriber's access style, and the sign Calling Side is the mobile subscriber.SDP in INVITE carries Calling Side carrying IP terminal point information.

S705, IMS handles business, and judging called is fixed-line subscriber, sends INIVTE message to callee side MGCF, wherein carries calling subscriber's access style, and the sign calling subscriber is the mobile subscriber.

S706, callee side MGCF send ADD Req message, and notice MGW sets up the IP end points that is used for transferring voice.Wherein carry the SDP information of Calling Side.Callee side MGCF is according to calling subscriber's access style and called subscriber's access style, and judgement is that the mobile subscriber calls out fixed-line subscriber, need to add EC when setting up carrying.Because this side is fixed-line subscriber, when notice MGW built carrying, notice MGW added the EC resource.

S707, MGW returns to ADD Reply and responds to callee side MGCF after setting up carrying, wherein carries the IP terminal point information of callee side.

S708, callee side MGCF sends 183 message to IMS, increases parameter and carries called subscriber's access style, and the sign called subscriber is fixed-line subscriber.Carry callee side SDP in 183 message.

S709, IMS sends 183 message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign called subscriber is fixed-line subscriber.

S710, callee side MGCF send IAM message to fixed switch.

S711, Calling Side MGCF receives 183 message, obtains callee side SDP information.Send MOD Req message to MGW, the IP terminal point information of callee side notice MGW.Calling Side MGCF is according to caller access style and called access style, and judgement is that the mobile subscriber calls out fixed-line subscriber, and this side is the mobile subscriber, in the MOD Req message that sends to MGW, does not notify this side MGW to add the EC resource.

S712 after MGW revises carrying, returns to MOD Reply response message for Calling Side MGCF.

S713, Calling Side MGCF send PRACK message to IMS, and 183 message are confirmed.

S714, IMS send PRACK to callee side MGCF.

S715, callee side MGCF send 200 OK to IMS, and PRACK is confirmed.

S716, IMS send 200 OK to Calling Side MGCF.

S717, callee side MGCF receives the ACM from fixed switch.

After S718, callee side MGCF receive ACM from fixed switch, send 180 message to IMS, wherein carry called subscriber's access style, the sign called subscriber is fixed-line subscriber.

S719, IMS sends 180 message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign called subscriber is fixed-line subscriber.

S720, Calling Side MGCF send ACM to mobile end office (EO).

S721, Calling Side MGCF send PRACK message to IMS, and 180 message are confirmed.

S722, IMS send PRACK to callee side MGCF.

S723, callee side MGCF send 200 OK to IMS, and PRACK is confirmed.

S724, IMS send 200 OK to Calling Side MGCF.

S725, callee side MGCF receives the ANM that fixed switch sends.

S726, callee side MGCF send 200 OK to IMS, wherein carry called subscriber's access style, and the sign called subscriber is fixed-line subscriber.

S727, IMS send 200 OK to Calling Side MGCF, wherein carry called subscriber's access style, and the sign called subscriber is fixed-line subscriber.

S728, Calling Side MGCF send ANM to mobile end office (EO).

S729, Calling Side MGCF sends ACK message to IMS.

S730, IMS sends ACK message to callee side MGCF.

In the embodiment shown in fig. 7, for calling out between mobile subscriber and fixed-line subscriber, defaultly add EC in fixation side, in some situation, when inadequate, can pass through the signaling negotiation mode such as fixation side EC resource, to mobile and fixing between call out at mobile side interpolation EC.

As shown in Figure 8, the embodiment of the present invention is take local terminal as callee side, the opposite end is Calling Side, and this end subscriber is fixed-line subscriber, for the mobile subscriber is example (be that the opposite end user access type is the mobile subscriber, the local terminal user access type is fixed-line subscriber), provide the method for another kind of elimination echo to end subscriber, by the signaling negotiation mode, add EC in the opposite end.The local terminal network element is with callee side MGCF, and the opposite end network element is take Calling Side MGCF as example.

S801-S805 with step S701-S705, repeats no more here.

S806, callee side MGCF send ADD Req message, and notice MGW sets up the IP end points that is used for transferring voice.Wherein carry the SDP information of Calling Side.Callee side MGCF is according to calling subscriber's access style and called subscriber's access style, and judgement is that the mobile subscriber calls out fixed-line subscriber, need to add EC when setting up carrying.Callee side MGCF judges this side EC inadequate resource, does not add the EC resource when notice callee side MGW builds carrying.Here, callee side MGCF can judge this side EC inadequate resource through but not limited to following method: 1, this side does not configure the EC resource; 2, this side has the individual EC resource of N (N is more than or equal to 1), but N EC resource all used; 3, after callee side notifies MGW to add EC in sending to the MODReq message of callee side MGW, MGW distributes the failure of EC resource, MGW adds the EC failure at the response indicating of returning for callee side MGCF, and callee side MGCF receives the response that MGW returns, and knows that this side is without EC.。

S807, MGW returns to ADD Reply and responds to callee side MGCF after setting up carrying, wherein carries the IP terminal point information of callee side.

S808, callee side MGCF sends 183 message to IMS, increases parameter and carries called subscriber's access style, and the sign called subscriber is fixed-line subscriber, carries simultaneously parameter and indicates this side not add EC.

S809, IMS sends 183 message to Calling Side MGCF, wherein carries called subscriber's access style, and the sign called subscriber is fixed-line subscriber, carries simultaneously parameter indication callee side and does not add EC.

S810, callee side MGCF send IAM message to fixed switch.

S811, Calling Side MGCF receives 183 message, and judgement is to call out between mobile subscriber and fixed-line subscriber, and the opposite end do not add EC, and when sending MOD Req message to MGW, notice MGW adds EC.

S812, Calling Side MGCF receives the MOD Reply response message that MGW returns.

When S813, Calling Side MGCF send PRACK to IMS, carry parameter and indicate this side to add EC.

When S814, IMS send PRACK to callee side MGCF, carry parameter and indicate this side to add EC.

S815-S830 with step S715-S730, repeats no more here.

Separately, in the present embodiment, if local terminal is considered as Calling Side, the opposite end is considered as callee side, and this end subscriber is considered as the mobile subscriber, end subscriber is considered as fixed-line subscriber also passable.That is: opposite end network element (being callee side MGCF) judges and does not add the EC resource in this side by this side inadequate resource.And this side is not added the message informing local terminal network element (being Calling Side MGCF) of EC.Calling Side MGCF receives the message that EC is not added in the opposite end.Calling Side MGCF judgement is that the opposite end user access type is fixed-line subscriber, and the local terminal user access type be the mobile subscriber, and the opposite end do not add EC, interpolation EC when local terminal is set up carrying.

The EC that transform AGCF for fixing end office (EO) as processes, and the invention provides following embodiment.As shown in Figure 9, the present embodiment is example for the mobile subscriber by the fixed-line subscriber that MGCF calls out under AGCF, and the method for another kind of elimination echo is provided, and adds EC at callee side by the AGCF indication.Here, the local terminal network element is AGCF, and the opposite end network element is Calling Side MGCF.

S901-S904 with step S801-S804, repeats no more here.

S905, IMS handles business, and judging called is the user of AGCF, sends INIVTE message to callee side AGCF, wherein carries calling subscriber's access style, and the sign calling subscriber is the mobile subscriber.

S906, AGCF receives INVITE, and the judgement opposite end is the mobile subscriber, sends ADD Req message, and when notice MGW set up carrying, indication MGW added EC.

S907-S909 is with step S707-S709.S910-S915 is with step S711-S716.S916-S922 is with step S718-S724.S923-S927 is with step S726-S730.Here repeat no more.Difference is that in embodiment shown in Figure 7, the callee side network element is called MGCF, and in the present embodiment, the callee side network element is AGCF.

Figure 10 calls out fixed-line subscriber under AGCF as example take the mobile subscriber by mAGCF, the method for another kind of elimination echo is provided, and consults to add EC in the mAGCF side by signaling.Here, the local terminal network element is AGCF, and the opposite end network element is mAGCF (be that the opposite end user access type is the mobile subscriber, the local terminal user access type is fixed-line subscriber).

S1001-S1004, same S902-S905.Difference is that in Fig. 9, the opposite end network element is Calling Side MGCF, and in the present embodiment, the opposite end network element is mAGCF.

S1005, AGCF are according to calling subscriber's access style and called subscriber's access style, and judgement is that the mobile subscriber calls out fixed-line subscriber, need to add EC when setting up carrying.AGCF judgement EC inadequate resource, AGCF sends ADD Req message to MGW, does not add the EC resource when notice MGW sets up carrying.Here, AGCF can judge this side EC inadequate resource through but not limited to following method: 1, this side does not configure the EC resource; 2, this side has the individual EC resource of N (N is more than or equal to 1), but N EC resource all used; 3, after AGCF notified MGW to add EC in sending to the MOD Req message of MGW, MGW distributed the failure of EC resource, and MGW adds the EC failure at the response indicating that returns to AGCF, and AGCF receives the response that MGW returns, and knows that this side is without EC.

S1006, MGW returns to ADD Reply and responds to callee side AGCF after setting up carrying, wherein carries the IP terminal point information of callee side.

S1007, AGCF sends 183 message to IMS, increases parameter and carries called subscriber's access style, and the sign called subscriber is fixed-line subscriber, carries simultaneously parameter and indicates this side not add EC.

S1008, IMS sends 183 message to Calling Side mAGCF, wherein carries called subscriber's access style, and the sign called subscriber is fixed-line subscriber, carries simultaneously parameter indication callee side and does not add EC.

S1009, Calling Side mAGCF receives 183 message, and judgement is to call out between mobile and fixing, and the opposite end do not add EC, and when sending MOD Req message to MGW, notice MGW adds EC.

S1010, Calling Side mAGCF receives the MOD Reply response message that MGW returns.

When S1011, Calling Side mAGCF send PRACK to IMS, carry parameter and indicate this side to add EC.

When S1012, IMS send PRACK to callee side AGCF, carry parameter and indicate this side to add EC.

S1013-S1016 is with step 914-917.S1017-S1022 is with step 919-924.Difference is that in Fig. 9, the Calling Side network element is caller MGCF, and in the present embodiment, the Calling Side network element is mAGCF.

S1023, Calling Side mAGCF sends ACK message to IMS.

S1024, IMS sends ACK message to callee side AGCF.

As shown in figure 11, the embodiment of the present invention also provides a kind of equipment of eliminating echo, comprises the first receiving element 1101, judging unit 1103 and determining unit 1105.Described the first receiving element 1101 is used for receiving the message of carrying the opposite end user access type that the opposite end network element sends; Judging unit 1103 is used for according to opposite end user access type and local terminal user access type, and whether judgement needs to add echo canceller EC when setting up carrying; Determining unit 1105 is used for when needs add described echo canceller EC, determines to add described echo canceller EC when local terminal or opposite end foundation carrying.This equipment is specifically as follows MGCF, also can be mAGCF, AGCF.

As shown in figure 12, the embodiment of the present invention also provides the equipment of another kind of elimination echo, comprises the first receiving element 1101, judging unit 1103 and determining unit 1105 in equipment as shown in figure 11.Wherein, judging unit 1103 comprises following at least one module: the first judge module 11031, and being used for working as described opposite end user access type is the mobile subscriber, when described local terminal user access type was the mobile subscriber, determining did not need to add EC when setting up carrying; The second judge module 11033, being used for working as described opposite end user access type is fixed-line subscriber, when described local terminal user access type is the mobile subscriber, determines need to add EC when setting up carrying; The 3rd judge module 11035, being used for working as described opposite end user access type is the mobile subscriber, when described local terminal user access type is fixed-line subscriber, determines need to add EC when setting up carrying.This equipment is specifically as follows MGCF, also can be mAGCF, AGCF.

In the equipment of the elimination echo that another embodiment of the present invention provides, comprise the first receiving element 1101, judging unit 1103 and determining unit 1105 in equipment as shown in figure 12; Judging unit 1103 comprises following at least one module: the first judge module 11031, the second judge modules 11033 and the 3rd judge module 11035.Wherein, determining unit 1105, concrete being used for added EC when setting up carrying in the opposite end when the second judge module 11033 is determined to need to add EC.This equipment is specifically as follows MGCF, also can be mAGCF, AGCF.

In the equipment of the elimination echo that another embodiment of the present invention provides, comprise the first receiving element 1101, judging unit 1103 and determining unit 1105 in equipment as shown in figure 12; Judging unit 1103 comprises following at least one module: the first judge module 11031, the second judge modules 11033 and the 3rd judge module 11035.Wherein, determining unit 1105, concrete being used for added EC when local terminal is set up carrying when the 3rd judge module 11035 is determined to need to add EC.This equipment is specifically as follows MGCF, also can be mAGCF, AGCF.

As shown in figure 13, the embodiment of the present invention also provides the equipment of another kind of elimination echo, comprises the first receiving element 1101, judging unit 1103 and determining unit 1105 in equipment as shown in figure 12; Judging unit 1103 comprises following at least one module: the first judge module 11031, the second judge modules 11033 and the 3rd judge module 11035.Wherein, determining unit 1105, concrete being used for determined to need to add EC when the 3rd judge module 11035, and during the EC inadequate resource of local terminal, adds EC when setting up carrying in the opposite end.This equipment is specifically as follows MGCF, also can be mAGCF, AGCF.

Optionally, the equipment of this elimination echo also comprises the second receiving element 1301, is used for receiving the notification message that the opposite end network element sends, and described notification message carries the indication that EC is not added in the opposite end.

This equipment is specifically as follows MGCF, also can be mAGCF, AGCF.

The equipment of the elimination echo that provides by the present embodiment can be according to local terminal user access type and opposite end user access type, solve flexibly call proceeding and add problem to the EC of IMS.The concrete operations of network element repeat no more here with corresponding embodiment of the method.

One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to complete by computer program, described program can be stored in a computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.

Claims

1. a method of eliminating echo, is characterized in that, comprising:

2. the method for elimination echo as claimed in claim 1, is characterized in that, described local terminal network element is according to opposite end user access type and local terminal user access type, and whether judgement needs to add echo canceller EC when setting up carrying comprises:

If the opposite end user access type is the mobile subscriber, the local terminal user access type is the mobile subscriber, does not need to add EC when setting up carrying;

If the opposite end user access type is fixed-line subscriber, the local terminal user access type is the mobile subscriber, need to add EC when setting up carrying; Or,

If the opposite end user access type is the mobile subscriber, the local terminal user access type is fixed-line subscriber, need to add EC when setting up carrying.

3. the method for elimination echo as claimed in claim 1 or 2, is characterized in that, when needs add described echo canceller EC, describedly adds described echo canceller EC comprise when carrying is set up in local terminal or opposite end:

If the opposite end user access type is fixed-line subscriber, the local terminal user access type is the mobile subscriber, adds EC when setting up carrying in the opposite end.

4. the method for elimination echo as claimed in claim 1 or 2, is characterized in that, when needs add described echo canceller EC, describedly adds described echo canceller EC comprise when carrying is set up in local terminal or opposite end:

If the opposite end user access type is the mobile subscriber, the local terminal user access type is fixed-line subscriber, adds EC when local terminal is set up carrying.

5. the method for elimination echo as claimed in claim 1 or 2, is characterized in that, when needs add described echo canceller EC, describedly adds described echo canceller EC comprise when carrying is set up in local terminal or opposite end:

If the opposite end user access type is fixed-line subscriber, the local terminal user access type is the mobile subscriber, and the opposite end do not add EC, adds EC when local terminal is set up carrying.

6. the method for elimination echo as claimed in claim 5, is characterized in that, further comprises:

Described local terminal network element receives the notification message that the opposite end network element sends, and described notification message carries the indication that EC is not added in the opposite end.

7. the method for elimination echo as claimed in claim 1 or 2, is characterized in that, when needs add described echo canceller EC, also will further consider local terminal EC resource, describedly adds described echo canceller EC comprise when carrying is set up in local terminal or opposite end:

If the opposite end user access type is the mobile subscriber, the local terminal user access type is fixed-line subscriber, and the EC inadequate resource of local terminal, adds EC when setting up carrying in the opposite end.

8. the method for elimination echo as claimed in claim 7, is characterized in that, further comprises:

Described local terminal network element sends a notification message to the opposite end network element, and described notification message carries the indication that local terminal does not add EC.

9. as the arbitrary described method of power 1-2, it is characterized in that, described local terminal is callee side, and described opposite end is Calling Side; Perhaps, described local terminal is Calling Side, and described opposite end is callee side.

10. as power 9 described methods, it is characterized in that, if described local terminal is callee side, described opposite end is Calling Side, described opposite end network element is Calling Side MGCF MGCF, and described local terminal network element also comprises before receiving the message of carrying the opposite end user access type:

If Calling Side MGCF judgement is called out from the mobile network, Calling Side MGCF sends to the user access type that carries in the message of local terminal network element and is the mobile subscriber; Or,

If Calling Side MGCF judgement is called out from fixed network, to send to the user access type that carries in the message of local terminal network element be fixed-line subscriber to Calling Side MGCF.

11. an equipment of eliminating echo is characterized in that, comprising:

12. the equipment of elimination echo as claimed in claim 11 is characterized in that, described judging unit comprise following at least one:

The first judge module, being used for working as described opposite end user access type is the mobile subscriber, when described local terminal user access type was the mobile subscriber, determining did not need to add EC when setting up carrying;

The second judge module, being used for working as described opposite end user access type is fixed-line subscriber, when described local terminal user access type is the mobile subscriber, determines need to add EC when setting up carrying;

The 3rd judge module, being used for working as described opposite end user access type is the mobile subscriber, when described local terminal user access type is fixed-line subscriber, determines need to add EC when setting up carrying.

13. the equipment of elimination echo as claimed in claim 12 is characterized in that,

Described determining unit, concrete being used for added EC when setting up carrying in the opposite end when described the second judge module is determined to need to add EC.

14. the equipment of elimination echo as claimed in claim 12 is characterized in that,

Described determining unit, concrete being used for added EC when local terminal is set up carrying when described the 3rd judge module is determined to need to add EC.

15. the equipment of elimination echo as claimed in claim 12 is characterized in that,

Described determining unit, concrete being used for determined to need to add EC when described the second judge module, and EC is added when not adding EC in the opposite end when local terminal is set up carrying.

16. the equipment of elimination echo as claimed in claim 12 is characterized in that,

Described determining unit, concrete being used for determined to need to add EC when described the 3rd judge module, and during the EC inadequate resource of local terminal, adds EC when setting up carrying in the opposite end.

17. the equipment of elimination echo as claimed in claim 16 is characterized in that, also comprises:

The second receiving element is used for receiving the notification message that the opposite end network element sends, and described notification message carries the indication that EC is not added in the opposite end.

18. the equipment of described elimination echo as arbitrary in claim 11-17 is characterized in that, the equipment of described elimination echo is the callee side network element, or the Calling Side network element.