CN102664863A - Method, device, and system for realizing call waiting by user equipment - Google Patents

The invention discloses a method, a device, and a system for realizing call waiting by user equipment. The method, the device, and the system do not support a second incoming call. The method comprises steps that: when first user equipment communicates with second user equipment, third user equipment calls the first user equipment which does not support a second incoming call; and an application server AS which supports terminal communication controls communication between the first user equipment and the third user equipment. The method, the device, and the system of the invention can guarantee that the user equipment which does not support a second incoming call can realize call waiting.

终端实现呼叫等待的方法、装置和系统Method, device and system for realizing call waiting by terminal

技术领域 technical field

本发明涉及通信领域，具体涉及不支持第二路呼入的终端实现呼叫等待的方法、装置和系统。The present invention relates to the communication field, in particular to a method, device and system for realizing call waiting by a terminal that does not support a second call-in.

背景技术 Background technique

所谓呼叫等待，是指当用户在已经存在的通话中收到新的呼叫请求时，用户将听到呼叫等待提示音，表示另有用户等待与之通话。同时通知新呼叫方等待接听，并向该呼叫方播放呼叫等待提示。用户可以选择接听新呼叫，也可以选择拒绝新呼叫，也可以对新呼叫不做处理即无应答。The so-called call waiting means that when a user receives a new call request during an existing call, the user will hear a call waiting prompt tone, indicating that another user is waiting to talk to him. At the same time, the new caller is notified to be on hold and a call waiting prompt is played to the caller. The user can choose to answer the new call, also can choose to reject the new call, or do not process the new call, that is, no answer.

现有技术中，呼叫等待是需要用户终端支持第二路呼入的。如图1所示，可简称为终端的用户终端(User Equipment，UE)B为NGN(Next GenerationNetwork，下一代通信网络)或IMS(IP Multimedia Subsystem，IP多媒体子系统)用户，签约了呼叫等待业务，UE A和UE C可以是NGN或IMS用户，也可以是其他网络如GSM(Global System for Mobile communication，全球移动通信系统)、CDMA(Code Division Multiple Access，码分多址接入)、PSTN(PublicSwitched Telephone Network，公共交换电话网)等用户。相关流程和信令步骤说明如下：In the prior art, call waiting requires the user terminal to support the second incoming call. As shown in Figure 1, the user terminal (User Equipment, UE) B, which can be referred to as a terminal for short, is an NGN (Next Generation Network, next-generation communication network) or IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) user, and has signed a call waiting service , UE A and UE C can be NGN or IMS users, or other networks such as GSM (Global System for Mobile communication, Global System for Mobile Communications), CDMA (Code Division Multiple Access, Code Division Multiple Access), PSTN ( PublicSwitched Telephone Network, public switched telephone network) and other users. The related process and signaling steps are described as follows:

步骤01，UE A向应用服务器(Application Server，AS)发送Invite(邀请)请求，请求号码为UE B。UE B与UE C通话时，UE A以发送Invite请求的方式拔打UE B，Invite请求中携带UE A的会话描述协议(Session DescriptionProtocol，SDP)信息，包括IP地址、端口号、音视频属性、编码格式等。Step 01, UE A sends an Invite (invitation) request to the application server (Application Server, AS), and the request number is UE B. When UE B talks to UE C, UE A dials UE B by sending an Invite request. The Invite request carries UE A's Session Description Protocol (Session Description Protocol, SDP) information, including IP address, port number, audio and video attributes, encoding format, etc.

步骤02，AS向UE B发送Invite请求，请求号码为UE B。Step 02, AS sends an Invite request to UE B, and the request number is UE B.

步骤03，UE B向AS返回180Ring(振铃)(XML(可扩展标记语言))或182(Queued)排队临时响应。UE B支持第二路呼入，有能力接听第二路呼入，因此返回180Ring(XML)或182Queued，表示UE B收到了新的呼叫请求，并处于振铃状态或排队状态。Step 03, UE B returns 180 Ring (Ring) (XML (Extensible Markup Language)) or 182 (Queued) queued provisional response to AS. UE B supports the second incoming call and has the ability to answer the second incoming call, so it returns 180Ring (XML) or 182Queued, indicating that UE B has received a new call request and is in the ringing or queuing state.

步骤04，AS向媒体资源服务器(Media Resource Server，MRS)发送Invite请求，其中携带UEA的SDP信息。AS收到180Ring(XML)或182Queued，执行呼叫等待业务逻辑，欲对UE A播放呼叫等待提示音，于是建立UE A到MRS的放音通道。Step 04, the AS sends an Invite request to the Media Resource Server (MRS), which carries the SDP information of the UEA. AS receives 180Ring(XML) or 182Queued, executes the call waiting business logic, wants to play the call waiting prompt tone to UE A, and establishes a playback channel from UE A to MRS.

步骤05，MRS向AS返回200OK最终响应，其中携带自身的SDP信息。In step 05, the MRS returns a 200 OK final response to the AS, which carries its own SDP information.

步骤06，AS向MRS发送ACK确认消息。In step 06, the AS sends an ACK confirmation message to the MRS.

步骤07，AS向UE A返回180Ring临时响应，其中携带MRS的SDP信息。In step 07, the AS returns a 180 Ring provisional response to UE A, which carries the SDP information of the MRS.

步骤08，AS向MRS发送INFO(通知)请求，指示MRS对UE A放音。In step 08, the AS sends an INFO (notification) request to the MRS, instructing the MRS to play the announcement to UE A.

步骤09，MRS向AS返回200OK成功响应。UE A听呼叫等待提示音，如：请不要挂机，您拔打的电话正在通话中。In step 09, the MRS returns a 200 OK success response to the AS. UE A listens to the call waiting prompt tone, such as: Please do not hang up, the phone you dialed is in communication.

步骤10，UE B向AS发送200OK(INVITE)最终响应，其中携带自身的SDP信息。UE B保持UE C，UE C听呼叫保持提示音，UE B摘机。Step 10, UE B sends a 200OK (INVITE) final response to AS, which carries its own SDP information. UE B holds UE C, UE C listens to the call hold prompt tone, and UE B goes off-hook.

步骤11，AS向MRS发送BYE(结束)请求。AS停止对UE A播放呼叫等待提示音。In step 11, the AS sends a BYE (end) request to the MRS. The AS stops playing the call waiting tone to UE A.

步骤12，MRS向AS返回200OK(BYE)成功响应。In step 12, the MRS returns a 200 OK (BYE) success response to the AS.

步骤13，AS向UE A发送UPDATE(更新)请求，其中携带UE B的SDP信息。Step 13, the AS sends an UPDATE (update) request to UE A, which carries the SDP information of UE B.

步骤14，UE A向AS返回200OK(UPDATE)成功响应，其中携带UE A的SDP信息。Step 14, UE A returns a 200 OK (UPDATE) success response to AS, which carries UE A's SDP information.

步骤15，AS向UE A返回200OK(INVITE)最终响应。Step 15, AS returns a 200OK (INVITE) final response to UE A.

步骤16，UE A向AS发送ACK确认消息。Step 16, UE A sends an ACK confirmation message to AS.

步骤17，AS向UE B发送ACK确认消息。至此，UE A与UE B完成了SDP协商，进入通话状态。Step 17, AS sends an ACK confirmation message to UE B. So far, UE A and UE B have completed the SDP negotiation and entered the call state.

可以看到，现有技术中，呼叫等待业务对终端是有要求的，即需要支持第二路呼入，并能支持呼叫保持功能。而目前大部分终端并不能满足上述呼叫等待业务对终端的要求，而是直接对第二路呼入返回Busy(忙)状态，因而不支持第二路呼入的终端在与对端通话时感知不到有来自其它终端的新呼叫，该新呼叫的主叫用户则只能听到失败提示音而没有机会与不支持第二路呼入的所述终端通话。It can be seen that, in the prior art, the call waiting service has requirements on the terminal, that is, it needs to support the second incoming call and the call holding function. At present, most terminals cannot meet the requirements of the above-mentioned call waiting service for the terminal, but directly return the Busy (busy) state to the second incoming call, so the terminal that does not support the second incoming call perceives the If there is no new call from other terminals, the calling user of this new call can only hear the failure prompt tone and has no chance to communicate with the terminal that does not support the second incoming call.

发明内容 Contents of the invention

有鉴于此，本发明的主要目的在于提供一种不支持第二路呼入的终端实现呼叫等待的方法、装置和系统，以便不支持第二路呼入的终端同样可以实现呼叫等待。In view of this, the main purpose of the present invention is to provide a method, device and system for implementing call waiting by a terminal that does not support the second incoming call, so that the terminal that does not support the second incoming call can also implement call waiting.

为达到上述目的，本发明的技术方案是这样实现的：In order to achieve the above object, technical solution of the present invention is achieved in that way:

一种不支持第二路呼入的终端实现呼叫等待的方法，该方法包括：A method for implementing call waiting for a terminal that does not support a second incoming call, the method comprising:

第一终端与第二终端通话时，第三终端拔打不支持第二路呼入的第一终端；When the first terminal talks with the second terminal, the third terminal dials the first terminal that does not support the second call;

支持终端通信的AS控制第一终端与第三终端之间的通信。The AS supporting terminal communication controls communication between the first terminal and the third terminal.

控制第一终端与第三终端之间的通信时，所述AS接收第一终端的忙响应，之后对第三终端播放呼叫等待提示音，还对第一终端播放第二路呼入的提示音并收号。When controlling the communication between the first terminal and the third terminal, the AS receives the busy response of the first terminal, and then plays a call waiting prompt tone to the third terminal, and also plays a second call-in prompt tone to the first terminal And receive the number.

控制第一终端与第三终端之间的通信时，所述AS还将第一终端和第二终端加入到会议中。When controlling the communication between the first terminal and the third terminal, the AS also joins the first terminal and the second terminal into the conference.

所述AS将第一终端和第二终端加入到会议中的方法为：The method for the AS to join the first terminal and the second terminal into the conference is as follows:

AS向MRS申请会议资源，基于该资源将第一终端和第二终端的通话加入到会议中。The AS applies for conference resources from the MRS, and based on the resources, the call between the first terminal and the second terminal is added to the conference.

控制第一终端与第三终端之间的通信时，When controlling the communication between the first terminal and the third terminal,

若第一终端选择接听第三终端的新呼叫，AS对第二终端播放呼叫保持提示音，并将第三终端与第一终端桥接通话；If the first terminal chooses to answer the new call of the third terminal, the AS plays a call hold prompt tone to the second terminal, and bridges the call between the third terminal and the first terminal;

若第一终端选择拒绝第三终端的新呼叫，AS对第三终端播放失败提示音；If the first terminal chooses to reject the new call of the third terminal, the AS plays a failure prompt tone to the third terminal;

若第一终端不对第三终端的新呼叫做出回应，AS释放第三终端的呼叫。If the first terminal does not respond to the new call of the third terminal, the AS releases the call of the third terminal.

该方法还包括：AS对第三终端播放失败提示音后，释放第三终端的呼叫；以及，The method also includes: after the AS plays the failure prompt tone to the third terminal, releasing the call of the third terminal; and,

如果第二终端未挂机期间第三终端挂机，AS对第二终端停止播放呼叫保持提示音，并将第二终端与第一终端桥接通话；If the third terminal hangs up while the second terminal is not on-hook, the AS stops playing the call hold prompt tone to the second terminal, and bridges the call between the second terminal and the first terminal;

如果第二终端未挂机期间第一终端挂机，AS释放第三终端、第二终端的呼叫。If the first terminal hangs up while the second terminal is not on-hook, the AS releases the calls between the third terminal and the second terminal.

该方法还包括：第一终端预先在AS上签约呼叫等待业务。The method also includes: the first terminal subscribes to the call waiting service on the AS in advance.

一种不支持第二路呼入的终端实现呼叫等待的系统，该系统包括终端、AS；所述终端包括第一终端、第二终端、第三终端；其中，A system that implements call waiting for a terminal that does not support a second incoming call, the system includes a terminal and an AS; the terminals include a first terminal, a second terminal, and a third terminal; wherein,

所述第一终端与第二终端通话时，所述第三终端用于拔打不支持第二路呼入的第一终端；When the first terminal talks with the second terminal, the third terminal is used to dial the first terminal that does not support the second call;

支持终端通信的所述AS，用于控制第一终端与第三终端之间的通信。The AS supporting terminal communication is used to control communication between the first terminal and the third terminal.

控制第一终端与第三终端之间的通信时，所述AS用于接收第一终端的忙响应，之后对第三终端播放呼叫等待提示音，还对第一终端播放第二路呼入的提示音并收号。When controlling the communication between the first terminal and the third terminal, the AS is used to receive the busy response of the first terminal, and then play the call waiting prompt tone to the third terminal, and also play the second incoming call to the first terminal. Prompt tone and receive number.

控制第一终端与第三终端之间的通信时，所述AS还用于将第一终端和第二终端加入到会议中。When controlling the communication between the first terminal and the third terminal, the AS is also used to join the first terminal and the second terminal into the conference.

该系统还包括MRS，所述AS将第一终端和第二终端加入到会议中时，用于向MRS申请会议资源，并基于该资源将第一终端和第二终端的通话加入到会议中。The system further includes an MRS. When the AS joins the first terminal and the second terminal into the conference, it applies to the MRS for a conference resource, and based on the resource, joins the conversation between the first terminal and the second terminal into the conference.

控制第一终端与第三终端之间的通信时，When controlling the communication between the first terminal and the third terminal,

若第一终端选择接听第三终端的新呼叫，AS用于对第二终端播放呼叫保持提示音，并将第三终端与第一终端桥接通话；If the first terminal chooses to answer the new call of the third terminal, the AS is used to play a call hold prompt tone to the second terminal, and bridge the call between the third terminal and the first terminal;

若第一终端选择拒绝第三终端的新呼叫，AS用于对第三终端播放失败提示音；If the first terminal chooses to reject the new call of the third terminal, the AS is used to play a failure prompt tone to the third terminal;

若第一终端不对第三终端的新呼叫做出回应，AS用于释放第三终端的呼叫。If the first terminal does not respond to the new call of the third terminal, the AS is used to release the call of the third terminal.

AS对第三终端播放失败提示音后，还用于释放第三终端的呼叫；以及，After the AS plays the failure prompt tone to the third terminal, it is also used to release the call of the third terminal; and,

如果第二终端未挂机期间第三终端挂机，AS还用于对第二终端停止播放呼叫保持提示音，并将第二终端与第一终端桥接通话；If the third terminal hangs up while the second terminal is not on-hook, the AS is also used to stop playing the call hold prompt tone to the second terminal, and bridge the call between the second terminal and the first terminal;

如果第二终端未挂机期间第一终端挂机，AS还用于释放第三终端、第二终端的呼叫。If the first terminal hangs up while the second terminal is not on-hook, the AS is also used to release the calls of the third terminal and the second terminal.

所述第一终端还用于预先在AS上签约呼叫等待业务。The first terminal is also used to pre-subscribe the call waiting service on the AS.

一种不支持第二路呼入的终端实现呼叫等待的装置，该装置包括接收判断模块、通话桥接模块；其中，A device for implementing call waiting for a terminal that does not support a second call-in, the device includes a receiving judgment module and a call bridge module; wherein,

所述接收判断模块，用于在第一终端与第二终端通话时，获知第三终端拔打不支持第二路呼入的第一终端；并据此得出要控制第一终端与第三终端之间的通信的判断结果；The reception judging module is used to know that the third terminal dials the first terminal that does not support the second call-in when the first terminal communicates with the second terminal; The judgment result of the communication between the terminals;

所述通话桥接模块，用于根据所述接收判断模块的所述判断结果，控制第一终端与第三终端之间的通信。The call bridge module is configured to control the communication between the first terminal and the third terminal according to the judgment result of the reception judgment module.

所述接收判断模块，用于接收包括呼入请求、用户振铃、用户摘机在内的呼叫事件。The reception judging module is used for receiving call events including incoming call request, user ringing, and user off-hook.

该装置还包括放音混音模块，用于在第一终端与第三终端之间通信时，接收第一终端的忙响应，之后对第三终端播放呼叫等待提示音，还对第一终端播放第二路呼入的提示音并收号。The device also includes a sound playback and mixing module, which is used to receive a busy response from the first terminal when communicating between the first terminal and the third terminal, and then play a call waiting prompt tone to the third terminal, and also play a tone to the first terminal. The prompt tone of the second incoming call and receive the number.

控制第一终端与第三终端之间的通信时，所述接收判断模块还用于基于相连的MRS，将第一终端和第二终端加入到会议中。When controlling the communication between the first terminal and the third terminal, the reception judging module is also used to join the first terminal and the second terminal into the conference based on the connected MRS.

所述接收判断模块将第一终端和第二终端加入到会议中时，用于：When the reception judging module joins the first terminal and the second terminal into the conference, it is used to:

向MRS申请会议资源，基于该资源将第一终端和第二终端的通话加入到会议中。Apply for conference resources from the MRS, and join the call between the first terminal and the second terminal into the conference based on the resources.

该装置还包括呼叫释放模块；控制第一终端与第三终端之间的通信时，The device also includes a call release module; when controlling the communication between the first terminal and the third terminal,

若第一终端选择接听第三终端的新呼叫，所述放音混音模块用于对第二终端播放呼叫保持提示音，所述通话桥接模块用于将第三终端与第一终端桥接通话；If the first terminal chooses to answer the new call of the third terminal, the sound playback and mixing module is used to play the call hold prompt tone to the second terminal, and the call bridge module is used to bridge the call between the third terminal and the first terminal;

若第一终端选择拒绝第三终端的新呼叫，所述放音混音模块用于对第三终端播放失败提示音；If the first terminal chooses to reject the new call of the third terminal, the sound playback and mixing module is used to play a failure prompt tone to the third terminal;

若第一终端不对第三终端的新呼叫做出回应，所述呼叫释放模块用于释放第三终端的呼叫。If the first terminal does not respond to the new call of the third terminal, the call release module is used to release the call of the third terminal.

所述呼叫释放模块还用于：在所述放音混音模块对第三终端播放失败提示音后，释放第三终端的呼叫；以及，The call release module is also used to: release the call of the third terminal after the sound playback and mixing module plays the failure prompt tone to the third terminal; and,

如果第二终端未挂机期间第三终端挂机，所述放音混音模块还用于对第二终端停止播放呼叫保持提示音，所述通话桥接模块还用于将第二终端与第一终端桥接通话；If the third terminal is on-hook while the second terminal is not on-hook, the playback and mixing module is also used to stop playing the call hold prompt tone to the second terminal, and the call bridge module is also used to bridge the second terminal with the first terminal call;

如果第二终端未挂机期间第一终端挂机，所述呼叫释放模块还用于释放第三终端、第二终端的呼叫。If the first terminal is on-hook while the second terminal is not on-hook, the call release module is further configured to release the calls of the third terminal and the second terminal.

所述第一终端还用于预先在AS上签约呼叫等待业务。The first terminal is also used to pre-subscribe the call waiting service on the AS.

该装置设置于AS中。The device is set in the AS.

可见，本发明不支持第二路呼入的终端实现呼叫等待的方法、装置和系统，当第一终端与第二终端通话时，第三终端可拔打不支持第二路呼入的第一终端；支持终端通信的AS控制第一终端与第三终端之间的通信。因此，本发明能够保证不支持第二路呼入的终端同样可以实现呼叫等待。It can be seen that the method, device and system of the present invention realize call waiting for a terminal that does not support the second call. When the first terminal talks with the second terminal, the third terminal can dial the first call that does not support the second call. terminal; the AS supporting terminal communication controls the communication between the first terminal and the third terminal. Therefore, the present invention can ensure that the terminals that do not support the second incoming call can also implement call waiting.

附图说明 Description of drawings

图1为现有技术呼叫等待业务的逻辑流程图；Fig. 1 is the logical flowchart of prior art call waiting service;

图2为本发明系统的架构示意图；Fig. 2 is a schematic diagram of the architecture of the system of the present invention;

图3a与图3b为本发明实施例的逻辑流程示意图；FIG. 3a and FIG. 3b are schematic diagrams of the logic flow of the embodiment of the present invention;

图4为本发明实施例的呼叫等待应用服务器的模块示意图；FIG. 4 is a block diagram of a call waiting application server according to an embodiment of the present invention;

图5为本发明实施例的用户无呼叫等待权限的流程示意图；5 is a schematic flow diagram of a user without call waiting authority according to an embodiment of the present invention;

图6为本发明实施例的原呼叫双方加入会议的流程示意图；FIG. 6 is a schematic flow diagram of the original calling parties joining a conference according to an embodiment of the present invention;

图7为本发明实施例的用户接听新呼叫的流程示意图；FIG. 7 is a schematic flow diagram of a user answering a new call according to an embodiment of the present invention;

图8为本发明实施例的用户拒绝新呼叫的流程示意图；FIG. 8 is a schematic flow diagram of a user rejecting a new call according to an embodiment of the present invention;

图9为本发明实施例的用户对新呼叫无应答的流程示意图；FIG. 9 is a schematic flow diagram of a user not responding to a new call according to an embodiment of the present invention;

图10为本发明实施例的不支持第二路呼入的终端实现呼叫等待的流程简图。FIG. 10 is a simplified flow chart of implementing call waiting by a terminal that does not support the second incoming call according to an embodiment of the present invention.

具体实施方式 Detailed ways

参见图2，图2为本发明系统的架构示意图，下面针对图2中的网元功能作如下说明：Referring to Fig. 2, Fig. 2 is a schematic diagram of the architecture of the system of the present invention, and the functions of the network elements in Fig. 2 are described as follows:

1、UE：用户用于发起呼叫、接听呼叫以及做其他呼叫操作的装置，如C网或G网手机、PSTN终端、IMS终端等。1. UE: The device used by users to initiate calls, answer calls, and perform other call operations, such as C network or G network mobile phones, PSTN terminals, IMS terminals, etc.

2、AS：提供底层业务能力，如：呼叫控制，状态上报，话单生成等功能。2. AS: Provides the underlying service capabilities, such as: call control, status reporting, bill generation and other functions.

3、MRS：提供语音媒体能力，一般为媒体服务器(Media Server，MS)，如提供放音、收号、混音等功能。3. MRS: Provides audio media capabilities, generally a Media Server (MS), such as providing functions such as playback, number collection, and audio mixing.

具体网元中使用协议如下：The protocols used in specific network elements are as follows:

1、AS同MRS或UE之间可基于呼叫通话的媒体协商，AS与UE通过核心网使用SIP协议互通，AS同MRS之间通常使用SIP协议或MGCP(MediaGateway Control Protocol，媒体网关控制协议)，具体采用那种协议取决于MRS所支持的协议类型。1. Call-based media negotiation between AS and MRS or UE, AS and UE use SIP protocol to communicate through the core network, AS and MRS usually use SIP protocol or MGCP (MediaGateway Control Protocol, Media Gateway Control Protocol), Which protocol to use depends on the type of protocol supported by the MRS.

2、UE与MRS之间根据呼叫时媒体包的编解码格式、收发端口、带宽传输速率等进行媒体协商，完成媒体流的传送。2. The UE and the MRS conduct media negotiation according to the codec format, transceiver port, and bandwidth transmission rate of the media packet during the call to complete the transmission of the media stream.

需要说明的是，图2只是概要的图示，隐藏了其它无关的IMS或NGN网络拓扑结构。实际实现中，AS、MRS及UE是接入到IMS网络或NGN网络中的。It should be noted that FIG. 2 is only a schematic illustration, and other irrelevant IMS or NGN network topology structures are hidden. In actual implementation, AS, MRS and UE are connected to IMS network or NGN network.

本发明的逻辑流程图如图3所示，其中UE B为NGN或IMS用户，AS为呼叫等待业务应用服务器，UE A和UE C可以是NGN或IMS用户，也可以是其他网络(如GSM、CDMA、PSTN等)用户。图3所示流程包括以下步骤：Logic flow chart of the present invention is shown in Figure 3, wherein UE B is NGN or IMS user, AS is the service application server of call waiting, UE A and UE C can be NGN or IMS user, also can be other networks (such as GSM, CDMA, PSTN, etc.) users. The process shown in Figure 3 includes the following steps:

步骤01，UE B与UE C通话时，UE A拔打UE B。Step 01, when UE B talks to UE C, UE A dials UE B.

步骤02，UE B不支持第二路呼入，返回忙的最终响应，该响应到达AS。Step 02, UE B does not support the second incoming call, and returns a busy final response, which reaches AS.

步骤03，若UE B在AS上签约了呼叫等待业务，则执行步骤05；否则执行步骤04。Step 03, if UE B subscribes to the call waiting service on the AS, go to step 05; otherwise go to step 04.

步骤04，AS对UE A播放失败提示音(如：您拔打的电话正在通话中，请稍后再拔)后释放UEA。流程结束。Step 04, AS plays a failure prompt tone to UE A (such as: the phone you dialed is in the middle of a call, please dial it later) and then releases UEA. The process ends.

步骤05，AS对UEA播放呼叫等待提示音，如：请不要挂机，您拔打的电话正在通话中。In step 05, the AS plays a call waiting prompt tone to the UEA, such as: please do not hang up, the phone you dialed is in the middle of a call.

步骤06，AS向MRS申请会议资源，基于该资源将UE B、UE C的通话加入到会议中。In step 06, the AS applies for conference resources from the MRS, and joins the call between UE B and UE C into the conference based on the resources.

步骤07，AS对UE B播放第二路呼入提示音(如：您有新的来电，接听请按1，拒绝请按2)并进行收号，播放提示音以及收号的操作可以循环一定时间(如1分钟)。此时UE B既可以和UE C通话，也可以同时进行放音收号操作。Step 07, AS plays the second call-in prompt tone to UE B (for example: you have a new call, please press 1 to answer it, press 2 to reject it) and collect the number, the operation of playing the prompt tone and receiving the number can be cycled for a certain period of time time (eg 1 minute). At this time, UE B can talk to UE C, and can also play and collect numbers at the same time.

步骤08，若AS对UE B的收号内容为1，则执行步骤12；否则执行步骤09。Step 08, if the number received by AS from UE B is 1, then execute step 12; otherwise, execute step 09.

步骤09，若AS对UE B的收号内容为2，则执行步骤11；否则执行步骤10。Step 09, if the number received by AS from UE B is 2, then execute step 11; otherwise, execute step 10.

步骤10，放音收号时间结束后，AS释放UE A。释放混音和放音资源，将UE B与UE C桥接通话。流程结束。Step 10: After the time for playing the announcement and receiving the number is over, the AS releases UE A. Release mixing and playback resources, and bridge call between UE B and UE C. The process ends.

步骤11，AS对UE A播放失败提示音，如：您拔打的电话正在通话中，请稍后再拔。然后AS释放UE A，并释放混音资源和放音资源，将UE B与UE C桥接通话。流程结束。Step 11, AS plays a failure prompt tone to UE A, such as: The phone you dialed is in communication, please dial it later. Then the AS releases UE A, and releases the audio mixing resource and playback resource, and bridges UE B and UE C for a call. The process ends.

步骤12，AS对UE C播放呼叫保持提示音。Step 12, the AS plays a call hold prompt tone to the UE C.

步骤13，AS对UEA停止播放呼叫等待提示音。Step 13, the AS stops playing the call waiting prompt tone to the UEA.

步骤14，AS将UE A与UE B桥接，UE A与UE B进入通话状态。In step 14, the AS bridges UE A and UE B, and UE A and UE B enter the communication state.

步骤15，若UE C未挂机期间UE A挂机，则执行步骤19；否则执行步骤16。Step 15, if UE A is on-hook while UE C is not on-hook, then perform step 19; otherwise, perform step 16.

步骤16，若UE C未挂机期间UE B挂机，则执行步骤18；否则执行步骤17。Step 16, if UE B is on-hook while UE C is not on-hook, then perform step 18; otherwise, perform step 17.

步骤17，UE A与UE B继续通话。流程结束。Step 17, UE A and UE B continue talking. The process ends.

步骤18，AS释放UE A、UE C，然后释放原呼叫。流程结束。Step 18, AS releases UE A, UE C, and then releases the original call. The process ends.

步骤19，AS对UE C停止播放呼叫保持提示音。Step 19, the AS stops playing the call hold prompt tone to the UE C.

步骤20，AS将UE C与UE B桥接，UE C与UE B重新进入通话状态。流程结束。Step 20, the AS bridges UE C and UE B, and UE C and UE B re-enter the communication state. The process ends.

为了保证不支持第二路呼入的终端能够实现呼叫等待，可以进行如图4所示的设置。图4中，AS中所包含的相关模块如下：In order to ensure that the terminals that do not support the second incoming call can implement call waiting, the settings shown in Figure 4 can be performed. In Figure 4, the relevant modules contained in AS are as follows:

1、接收判断模块，接收到达AS的各种呼叫事件，如呼入请求、用户振铃、用户摘机等。如UE B返回忙状态时，用于判断用户是否具有呼叫等待业务权限，进行后续处理。1. The receiving and judging module receives various call events arriving at the AS, such as incoming call request, user ringing, user off-hook, etc. For example, when UE B returns to the busy state, it is used to determine whether the user has the right to call waiting service, and perform subsequent processing.

2、放音混音模块，用于指示MRS进行放音、放音收号、会议混音等操作，如对UE A播放失败提示音或呼叫等待提示音、对UE B放音并收号、对UE C播放呼叫保持提示音、将UE B与UE C进行会议混音等。2. The sound playback and mixing module is used to instruct MRS to play, play and collect numbers, and mix conferences, such as playing failure prompts or call waiting prompts to UE A, playing and receiving numbers to UE B, Play the call hold prompt tone to UE C, mix the conference audio between UE B and UE C, etc.

3、通话桥接模块，用于将两个用户的通话关联起来，使得两个用户进入通话状态。本发明中，用于将UE A与UE B桥接，以及UE B与UE C的桥接。3. The call bridging module is used to associate the calls of two users, so that the two users enter a call state. In the present invention, it is used for bridging UE A and UE B, and bridging UE B and UE C.

4、呼叫释放模块，用于流程结束后的呼叫释放，如失败提示音、用户挂机等流程后的呼叫释放。4. The call release module is used for call release after the process ends, such as call release after failure prompt tone, user hang-up and other processes.

包含上述AS的系统包括：Systems that include the above AS include:

UE，能够接入现存的相关网络(如GSM、CDMA、PSTN、NGN或IMS)中。可以是现存各网络下的终端，如GSM或CDMA手机、PSTN固话、NGN或IMS终端等。其中UE B为NGN或IMS用户，UE A和UE C可以是NGN或IMS用户，也可以是其他网络用户。The UE can access an existing related network (such as GSM, CDMA, PSTN, NGN or IMS). It can be terminals under various existing networks, such as GSM or CDMA mobile phones, PSTN fixed phones, NGN or IMS terminals, etc. Where UE B is an NGN or IMS user, UE A and UE C can be NGN or IMS users, or other network users.

AS，置于NGN或IMS核心网中，与NGN网络下的SS(Softswitch，软交换)或IMS网络下的S-CSCF(服务呼叫会话控制器)相连，同时与MRS相连。能够实现呼叫等待业务的用户鉴权、放音收号、通话桥接、呼叫释放、话单生成等。主要包括接收判断模块、放音混音模块、通话桥接模块、呼叫释放模块等。The AS is placed in the NGN or IMS core network, and is connected to the SS (Softswitch) under the NGN network or the S-CSCF (Serving Call Session Controller) under the IMS network, and is connected to the MRS at the same time. It can realize user authentication, announcement and number collection, call bridging, call release, bill generation, etc. of the call waiting service. It mainly includes receiving and judging module, playback and mixing module, call bridge module, call release module, etc.

MRS，与AS相连，通过AS的指示实现放音、放音收号及混音功能。在本发明中，MRS用于对用户终端播放相关提示音(如呼叫等待提示音、呼叫保持提示音)，或对用户终端播放相关提示音并接收用户终端的二次拨号输入，或对用户终端加入会议，进行混音。The MRS is connected to the AS, and realizes the functions of playing, playing and collecting numbers and mixing through the instructions of the AS. In the present invention, the MRS is used to play relevant prompts to the user terminal (such as call waiting prompts, call hold prompts), or to play relevant prompts to the user terminal and receive the second dial input of the user terminal, or to send a message to the user terminal Join the meeting and mix.

参见图5，图5为本发明实施例的用户无呼叫等待权限的流程示意图。图5中，UE B为NGN或IMS用户，但没有签约呼叫等待。图5所示流程包括以下步骤：Referring to FIG. 5 , FIG. 5 is a schematic flowchart of a user without call waiting right according to an embodiment of the present invention. In Figure 5, UE B is an NGN or IMS user, but has no call waiting subscription. The process shown in Figure 5 includes the following steps:

步骤01，UE A向AS发送INVITE请求，请求号码为UE B，所述INVITE请求中携带UE A的SDP信息。此时UE B与UE C正在通话中。Step 01, UE A sends an INVITE request to AS, the request number is UE B, and the INVITE request carries UE A's SDP information. At this time, UE B and UE C are talking.

步骤02，AS向UE B发送INVITE请求，请求号码为UE B，所述INVITE请求中携带UE A的SDP信息。Step 02, AS sends an INVITE request to UE B, the request number is UE B, and the SDP information of UE A is carried in the INVITE request.

步骤03，UE B向AS返回486Busy最终响应。UE B与UE C正在通话中，且UE B不支持第二路呼入，因此UE B返回忙状态。Step 03, UE B returns a 486 Busy final response to AS. UE B is talking with UE C, and UE B does not support the second call, so UE B returns to the busy state.

步骤04，AS向UE B发送ACK确认消息。Step 04, AS sends an ACK confirmation message to UE B.

步骤05，AS向MRS发送INVITE请求，其中携带UE A的SDP信息。AS判断UE B没有呼叫等待业务，欲对UEA放忙状态的失败提示音。Step 05, AS sends an INVITE request to MRS, which carries UE A's SDP information. AS judges that UE B does not have call waiting service, and tries to release the prompt tone for the failure of UEA in the busy state.

步骤06，MRS向AS返回200OK(INVITE)最终响应，其中携带自身的SDP信息。In step 06, the MRS returns a 200 OK (INVITE) final response to the AS, which carries its own SDP information.

步骤07，AS向MRS发送ACK确认消息。In step 07, the AS sends an ACK confirmation message to the MRS.

步骤08，AS向UE A发送183Session Process(会话过程)临时响应，携带MRS的SDP信息。In step 08, the AS sends a 183 Session Process (session process) provisional response to UE A, carrying the SDP information of the MRS.

步骤09，AS向MRS发送INFO通知请求，请求MRS对UE A播放提示音，如：您拔打的电话正在通话中，请稍后再拔。Step 09: AS sends an INFO notification request to MRS, requesting MRS to play a prompt tone to UE A, for example: the phone you dialed is in communication, please dial it later.

步骤10，MRS向AS返回200OK(INFO)最终响应。In step 10, the MRS returns a 200 OK (INFO) final response to the AS.

步骤11，MRS向AS发送BYE结束请求。MRS放音结束，请求释放放音资源。In step 11, the MRS sends a BYE end request to the AS. After the MRS announces, it requests to release the announcement resources.

步骤12，AS向MRS返回200OK(BYE)最终响应。In step 12, the AS returns a 200 OK (BYE) final response to the MRS.

步骤13，AS向UE A返回487Terminated(结束)最终响应。放音结束，AS释放UE A。Step 13, AS returns 487 Terminated (end) final response to UE A. After the announcement is over, the AS releases UE A.

步骤14，UE A向AS发送ACK确认消息。流程结束。Step 14, UE A sends an ACK confirmation message to AS. The process ends.

参见图6，图6为本发明实施例的原呼叫双方加入会议的流程示意图。图6中，UE B为NGN或IMS用户，签约了呼叫等待业务。图6所示流程包括以下步骤：Referring to FIG. 6 , FIG. 6 is a schematic flow chart of the original calling parties joining a conference according to an embodiment of the present invention. In Figure 6, UE B is an NGN or IMS user, and subscribed to the call waiting service. The process shown in Figure 6 includes the following steps:

步骤01，UE A向AS发送INVITE请求，请求号码为UE B，所述INVITE请求中携带UE A的SDP信息。此时UE B与UE C正在通话中。Step 01, UE A sends an INVITE request to AS, the request number is UE B, and the INVITE request carries UE A's SDP information. At this time, UE B and UE C are talking.

步骤02，AS向UE B发送INVITE请求，请求号码为UE B，所述INVITE中携带UE A的SDP信息。Step 02: AS sends an INVITE request to UE B, the request number is UE B, and the INVITE carries UE A's SDP information.

步骤03，UE B向AS返回486Busy最终响应。UE B与UE C正在通话中，且UE B不支持第二路呼入，因此UE B返回忙状态。Step 03, UE B returns a 486 Busy final response to AS. UE B is talking with UE C, and UE B does not support the second call, so UE B returns to the busy state.

步骤04，AS向UE B发送ACK确认消息。Step 04, AS sends an ACK confirmation message to UE B.

步骤05，AS向MRS发送INVITE请求，携带UE A的SDP信息。AS判断UE B有呼叫等待业务，欲对UE A放呼叫等待提示音。Step 05, the AS sends an INVITE request to the MRS, carrying UE A's SDP information. The AS judges that UE B has a call waiting service, and wants to play a call waiting prompt tone to UE A.

步骤06，MRS向AS返回200OK(INVITE)最终响应，其中携带自身的SDP信息。In step 06, the MRS returns a 200 OK (INVITE) final response to the AS, which carries its own SDP information.

步骤07，AS向MRS发送ACK确认消息。In step 07, the AS sends an ACK confirmation message to the MRS.

步骤08，AS向UE A发送180Ring临时响应，其中携带MRS的SDP信息。In step 08, the AS sends a 180 Ring provisional response to UE A, which carries the SDP information of the MRS.

步骤09，AS向MRS发送INFO通知请求，请求MRS对UE A循环播放提示音(如：请不要挂机，您拔打的电话正在通话中)，循环时间为1分钟左右。Step 09: AS sends an INFO notification request to MRS, requesting MRS to play a prompt tone to UE A in a loop (for example: please do not hang up, the phone you dialed is in communication), and the loop time is about 1 minute.

步骤10，MRS向AS返回200OK(INFO)最终响应。In step 10, the MRS returns a 200 OK (INFO) final response to the AS.

步骤11，AS向UE B发送REINVITE(再邀请)请求。AS欲将UE B加入到会议中。Step 11, AS sends a REINVITE (re-invitation) request to UE B. AS wants to add UE B to the conference.

步骤12，UE B向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 12, UE B returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤13，AS向MRS发送INVITE请求，其中携带UE B的SDP信息。Step 13, AS sends an INVITE request to MRS, which carries UE B's SDP information.

步骤14，MRS向AS返回200 OK(INVITE)最终响应，其中携带自身的SDP信息。In step 14, the MRS returns a 200 OK (INVITE) final response to the AS, which carries its own SDP information.

步骤15，AS向MRS发送ACK确认消息。In step 15, the AS sends an ACK confirmation message to the MRS.

步骤16，AS向UE B发送ACK确认消息，其中携带MRS的SDP信息。Step 16, AS sends an ACK confirmation message to UE B, which carries the SDP information of the MRS.

步骤17，AS向MRS发送INFO通知请求，请求MRS对UE B混音。In step 17, the AS sends an INFO notification request to the MRS, requesting the MRS to mix the audio of UE B.

步骤18，MRS向AS返回200OK(INFO)最终响应。In step 18, the MRS returns a 200 OK (INFO) final response to the AS.

步骤19，AS向MRS发送INFO通知请求，请求MRS对UE B循环放音收号(如：您有新的来电，接听请按1，拒绝请按2)，循环时间为1分钟左右。Step 19, AS sends an INFO notification request to MRS, requesting MRS to play the tone to UE B to collect the number (for example: you have a new call, press 1 to answer it, press 2 to reject it), the cycle time is about 1 minute.

步骤20，MRS向AS返回200OK(INFO)最终响应。In step 20, the MRS returns a 200 OK (INFO) final response to the AS.

步骤21，AS向UE C发送REINVITE请求。AS欲将UE C加入到会议中。Step 21, AS sends a REINVITE request to UE C. AS wants to add UE C to the conference.

步骤22，UE C向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 22, UE C returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤23，AS向MRS发送INVITE请求，其中携带UE C的SDP信息。Step 23, the AS sends an INVITE request to the MRS, which carries UE C's SDP information.

步骤24，MRS向AS返回200OK(INVITE)最终响应，其中携带自身的SDP信息。In step 24, the MRS returns a 200 OK (INVITE) final response to the AS, which carries its own SDP information.

步骤25，AS向MRS发送ACK确认消息。In step 25, the AS sends an ACK confirmation message to the MRS.

步骤26，AS向UE C发送ACK确认消息，其中携带MRS的SDP信息。Step 26, the AS sends an ACK confirmation message to UE C, which carries the SDP information of the MRS.

步骤27，AS向MRS发送INFO通知请求，请求MRS对UE C混音。Step 27, the AS sends an INFO notification request to the MRS, requesting the MRS to mix the UE C.

步骤28，MRS向AS返回200OK(INFO)最终响应。此时UE C与UE B处于通话状态，且UE B同时处于放音收号状态。In step 28, the MRS returns a 200 OK (INFO) final response to the AS. At this time, UE C and UE B are in the state of talking, and UE B is in the state of playing and receiving numbers at the same time.

步骤29，MRS向AS发送INFO通知请求，以将UE B的输入内容告知AS。Step 29, MRS sends an INFO notification request to AS to inform AS of UE B's input content.

步骤30，AS向MRS返回200OK(INFO)最终响应。AS对UE B的收号内容：若为1，则接图7；若为2，则接图8；若为空或其他，则接图9。In step 30, the AS returns a 200 OK (INFO) final response to the MRS. The number receiving content of AS to UE B: if it is 1, then connect to Figure 7; if it is 2, then connect to Figure 8; if it is empty or other, then connect to Figure 9.

图7为本发明实施例的用户接听新呼叫的流程示意图。图7中，UE B选择接听新呼叫，图7所示流程包括以下步骤：Fig. 7 is a schematic flow diagram of a user answering a new call according to an embodiment of the present invention. In Fig. 7, UE B selects to answer the new call, and the process shown in Fig. 7 includes the following steps:

步骤01，AS向MRS发送INFO通知请求，以请求MRS对UE C循环播放呼叫保持提示音(如：请稍等，呼叫保持中)，也可以是一段音乐。UE B输入内容为1，即选择接听新呼叫，AS对UE C播放呼叫保持提示音。Step 01, the AS sends an INFO notification request to the MRS to request the MRS to play the call hold prompt tone (for example: please wait a moment, the call is on hold) to the UE C in a loop, or a piece of music. The input content of UE B is 1, that is, it chooses to answer the new call, and AS plays the call hold prompt tone to UE C.

步骤02，MRS向AS返回200OK(INFO)最终响应。In step 02, the MRS returns a 200 OK (INFO) final response to the AS.

步骤03，AS向MRS发送BYE结束请求，以请求MRS释放UE B与MRS的放音和混音链路。AS停止对UE B放音和混音。Step 03, AS sends a BYE end request to MRS to request MRS to release the playback and mixing link between UE B and MRS. AS stops playing and mixing audio to UE B.

步骤04，MRS向AS返回200OK(BYE)最终响应。In step 04, the MRS returns a 200 OK (BYE) final response to the AS.

步骤05，AS向MRS发送BYE结束请求，以请求MRS释放UE A与MRS的放音链路。AS停止对UE A播放呼叫等待提示音。Step 05: AS sends a BYE end request to MRS to request MRS to release the announcement link between UE A and MRS. The AS stops playing the call waiting tone to UE A.

步骤06，MRS向AS返回200OK(BYE)最终响应。In step 06, the MRS returns a 200 OK (BYE) final response to the AS.

步骤07，AS向UE B发送REINVITE请求。AS欲对UE A和UE B桥接通话。Step 07, AS sends a REINVITE request to UE B. AS wants to bridge the call between UE A and UE B.

步骤08，UE B向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 08, UE B returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤09，AS向UE A发送UPDATE更新请求，其中携带UE B的SDP信息。Step 09, AS sends an UPDATE update request to UE A, which carries UE B's SDP information.

步骤10，UE A向AS返回200OK(UPDATE)最终响应，其中携带自身的SDP信息。Step 10, UE A returns a 200 OK (UPDATE) final response to AS, which carries its own SDP information.

步骤11，AS向UE A返回200OK(INVITE)最终响应。Step 11, AS returns 200OK (INVITE) final response to UE A.

步骤12，UE A向AS发送ACK确认消息。Step 12, UE A sends an ACK confirmation message to AS.

步骤13，AS向UE B发送ACK确认消息，其中携带UE A的SDP信息。UEA与UE B媒体协商完成，进入通话状态。Step 13, AS sends an ACK confirmation message to UE B, which carries UE A's SDP information. The media negotiation between UEA and UE B is completed and enters the call state.

步骤14，UE A向AS发送BYE结束请求。UE A与UE B通话结束，UE A挂机。Step 14, UE A sends a BYE end request to AS. The call between UE A and UE B ends, and UE A hangs up.

步骤15，AS向UE A返回200OK(BYE)最终响应。Step 15, AS returns a 200OK (BYE) final response to UE A.

步骤16，AS向MRS发送BYTE结束请求，以请求MRS释放UE C与MRS的放音链路。UE A挂机，因此AS欲停止对UE C播放呼叫保持提示音，并将UE B与UE C桥接通话。Step 16, AS sends a BYTE end request to MRS to request MRS to release the announcement link between UE C and MRS. UE A hangs up, so AS wants to stop playing the call hold prompt to UE C, and connect UE B and UE C to bridge the call.

步骤17，MRS向AS返回200OK(BYE)最终响应。In step 17, the MRS returns a 200 OK (BYE) final response to the AS.

步骤18，AS向UE B发送REINVITE请求。Step 18, AS sends a REINVITE request to UE B.

步骤19，UE B向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 19, UE B returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤20，AS向UE C发送REINVITE请求，其中携带UE B的SDP信息。Step 20, AS sends a REINVITE request to UE C, which carries UE B's SDP information.

步骤21，UE C向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 21, UE C returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤22，AS向UE C发送ACK确认请求。Step 22, AS sends an ACK confirmation request to UE C.

步骤23，AS向UE B发送ACK确认请求，其中携带UE C的SDP信息。UE B与UE C媒体协商完成，重新进入通话状态。流程结束。Step 23, AS sends an ACK confirmation request to UE B, which carries UE C's SDP information. The media negotiation between UE B and UE C is completed, and the call state is re-entered. The process ends.

参见图8，图8为本发明实施例的用户拒绝新呼叫的流程示意图。图8中，UE B选择拒绝新呼叫，图8所示流程包括以下步骤：Referring to FIG. 8 , FIG. 8 is a schematic flowchart of a user rejecting a new call according to an embodiment of the present invention. In Figure 8, UE B chooses to reject the new call, and the process shown in Figure 8 includes the following steps:

步骤01，AS向MRS发送INFO通知请求，以请求MRS对UE A播放失败提示音，如：您拔打的电话正在通话中，请稍后再拔。UE B输入内容为2，即选择拒绝新呼叫，AS对UE A播放失败提示音。Step 01: AS sends an INFO notification request to MRS to request MRS to play a failure prompt tone to UE A, for example: the phone you dialed is in communication, please dial it later. UE B enters 2, that is, chooses to reject the new call, and AS plays a failure prompt tone to UE A.

步骤02，MRS向AS返回200OK(INFO)最终响应。In step 02, the MRS returns a 200 OK (INFO) final response to the AS.

步骤03，AS向MRS发送BYE结束请求，以请求MRS释放UE A与MRS的放音链路。AS对UE A放音完毕，释放放音资源。Step 03: AS sends a BYE end request to MRS to request MRS to release the announcement link between UE A and MRS. After finishing playing the announcement to UE A, the AS releases the announcement resource.

步骤04，MRS向AS返回200OK(BYE)最终响应。In step 04, the MRS returns a 200 OK (BYE) final response to the AS.

步骤05，AS向UE A返回487Terminated最终响应。AS对UE A放音结束后释放UE A。Step 05, AS returns a 487 Terminated final response to UE A. After the AS plays the announcement to UE A, it releases UE A.

步骤06，UE A向AS发送ACK确认消息。Step 06, UE A sends an ACK confirmation message to AS.

步骤07，AS向MRS发送BYE结束请求，以请求MRS释放UE B与MRS的放音和混音链路。AS对UE B收号完毕，释放放音和混音资源。Step 07, AS sends a BYE end request to MRS to request MRS to release the playback and mixing link between UE B and MRS. After receiving the number from UE B, the AS releases the playback and mixing resources.

步骤08，MRS向AS返回200OK(BYE)最终响应。In step 08, the MRS returns a 200 OK (BYE) final response to the AS.

步骤09，AS向MRS发送BYE结束请求，以请求MRS释放UE C与MRS的混音链路。AS释放混音资源。Step 09, AS sends a BYE end request to MRS to request MRS to release the mixing link between UE C and MRS. The AS releases the audio mixing resource.

步骤10，MRS向AS返回200OK(BYE)最终响应。In step 10, the MRS returns a 200 OK (BYE) final response to the AS.

步骤11，AS向UE B发送REINVITE请求。AS欲将UE B和UE C桥接通话。Step 11, AS sends a REINVITE request to UE B. AS wants to bridge the call between UE B and UE C.

步骤12，UE B向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 12, UE B returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤13，AS向UE C发送REINVITE请求，其中携带UE B的SDP信息。Step 13, AS sends a REINVITE request to UE C, which carries UE B's SDP information.

步骤14，UE C向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 14, UE C returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤15，AS向UE C发送ACK确认消息。Step 15, AS sends an ACK confirmation message to UE C.

步骤16，AS向UE B发送ACK确认消息，其中携带UE C的SDP信息。UE B与UE C媒体协商完成，重新进入通话状态。流程结束。Step 16, AS sends an ACK confirmation message to UE B, which carries UE C's SDP information. The media negotiation between UE B and UE C is completed, and the call state is re-entered. The process ends.

参见图9，图9为本发明实施例的用户对新呼叫无应答的流程示意图。图9中，UE B不处理新呼叫，即对新呼叫无应答，图9所示流程包括以下步骤：Referring to FIG. 9, FIG. 9 is a schematic flowchart of a user not responding to a new call according to an embodiment of the present invention. In Figure 9, UE B does not process the new call, that is, there is no response to the new call, and the process shown in Figure 9 includes the following steps:

步骤01，AS向MRS发送BYE结束请求，以请求MRS释放UE A与MRS的放音链路。AS对UE B循环放音收号时间(如1分钟左右)到，UE B输入内容为空，或1和2之外的值，AS对UE A释放放音资源。Step 01, AS sends a BYE end request to MRS to request MRS to release the announcement link between UE A and MRS. When the number collection time (for example, about 1 minute) is up and the input content of UE B is empty, or a value other than 1 and 2, AS releases the announcement resources to UE A.

步骤02，MRS向AS返回200OK(BYE)最终响应。In step 02, the MRS returns a 200 OK (BYE) final response to the AS.

步骤03，AS向UE A返回408Time Out(超时)最终响应。AS对UE A放音结束后释放UEA。Step 03, AS returns 408 Time Out (timeout) final response to UE A. After the AS plays the announcement to UE A, it releases UEA.

步骤04，UE A向AS发送ACK确认消息。Step 04, UE A sends an ACK confirmation message to AS.

步骤05，AS向MRS发送BYE结束请求，以请求MRS释放UE B与MRS的放音和混音链路。AS对UE B循环放音收号时间到，释放放音和混音资源。Step 05, AS sends a BYE end request to MRS to request MRS to release the playback and mixing link between UE B and MRS. The AS cyclically plays the sound to UE B and releases the sound playing and mixing resources when the number collection time is up.

步骤06，MRS向AS返回200OK(BYE)最终响应。In step 06, the MRS returns a 200 OK (BYE) final response to the AS.

步骤07，AS向MRS发送BYE结束请求，以请求MRS释放UE C与MRS的混音链路。AS释放混音资源。Step 07, AS sends a BYE end request to MRS to request MRS to release the mixing link between UE C and MRS. The AS releases the audio mixing resources.

步骤08，MRS向AS返回200OK(BYE)最终响应。In step 08, the MRS returns a 200 OK (BYE) final response to the AS.

步骤09，AS向UE B发送REINVITE请求。AS欲将UE B和UE C桥接通话。Step 09, AS sends a REINVITE request to UE B. AS wants to bridge the call between UE B and UE C.

步骤10，UE B向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 10, UE B returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤11，AS向UE C发送REINVITE请求，其中携带UE B的SDP信息。Step 11, AS sends a REINVITE request to UE C, which carries UE B's SDP information.

步骤12，UE C向AS返回200OK(REINVITE)最终响应，其中携带自身的SDP信息。Step 12, UE C returns a 200 OK (REINVITE) final response to AS, which carries its own SDP information.

步骤13，AS向UE C发送ACK确认消息。Step 13, AS sends an ACK confirmation message to UE C.

步骤14，AS向UE B发送ACK确认消息，其中携带UE C的SDP信息。UE B与UE C媒体协商完成，重新进入通话状态。流程结束。Step 14, AS sends an ACK confirmation message to UE B, which carries UE C's SDP information. The media negotiation between UE B and UE C is completed, and the call state is re-entered. The process ends.

结合以上各图可见，基于前述AS及其所在系统，本发明针对不支持第二路呼入的终端实现呼叫等待的操作思路可以表示如图10所示的流程，该流程包括以下步骤：Combining the above figures, it can be seen that based on the above-mentioned AS and the system where it is located, the operation idea of the present invention for implementing call waiting for a terminal that does not support the second call-in can be represented as the process shown in Figure 10, which includes the following steps:

步骤1001：第一终端与第二终端通话时，第三终端拔打不支持第二路呼入的第一终端。Step 1001: When the first terminal talks with the second terminal, the third terminal dials the first terminal that does not support the second call.

步骤1002：支持终端通信的AS控制第一终端与第三终端之间的通信。Step 1002: the AS supporting terminal communication controls the communication between the first terminal and the third terminal.

由上述流程可见，第一终端与第二终端为正在通话中的终端，第三终端则为发起新呼叫的终端。It can be seen from the above process that the first terminal and the second terminal are terminals in communication, and the third terminal is a terminal that initiates a new call.

综上所述可见，无论是方法、装置还是系统，本发明针对不支持第二路呼入的终端实现呼叫等待的技术，具有如下优势和创新：(1)不需要终端支持第二路呼入，该第二路呼入的功能可由AS来实现。有新呼叫时AS会提示用户选择接听或拒绝呼叫，克服了用户无法感知新呼叫的问题。(2)不需要终端支持呼叫保持功能，由AS来实现。传统的呼叫等待功能，需要终端上支持呼叫保持按键，用于将原呼叫用户保持。本发明中若用户选择接听新呼叫，则由AS自动对原呼叫用户实现呼叫保持。(3)在会议中实现新呼叫的用户与原呼叫用户通话，同时进行放音收号，占用会议资源的时间少(最多为1分钟左右)。(4)可以实现新呼叫的用户与原呼叫用户的通话在会议呼叫与普通呼叫之间无缝切换，并且原呼叫用户感知不到切换的过程。To sum up, it can be seen that no matter it is a method, device or system, the present invention is aimed at the technology of realizing call waiting for a terminal that does not support the second-way incoming call, and has the following advantages and innovations: (1) It does not require the terminal to support the second-way incoming call , the function of the second incoming call can be realized by the AS. When there is a new call, the AS will prompt the user to choose to answer or reject the call, which overcomes the problem that the user cannot perceive the new call. (2) The terminal does not need to support the call hold function, which is implemented by the AS. The traditional call waiting function requires the terminal to support a call hold button to hold the original caller. In the present invention, if the user chooses to answer the new call, the AS automatically implements call hold for the original calling user. (3) In the conference, the new caller can communicate with the original caller, and at the same time play the sound and collect the number, which takes up less time for conference resources (about 1 minute at most). (4) The call between the new calling user and the original calling user can be seamlessly switched between the conference call and the ordinary call, and the original calling user cannot perceive the switching process.

需要说明的是，NGN和IMS下的终端都可以应用本发明，如SIP硬终端(有视频能力的SIP高端电话以及无视频能力的SIP低端电话)、SIP软终端(PC客户端)、POTS(Plain Old Telephone Service，普通老式的电话服务)用户等，此外GSM、CDMA、PSTN下的终端也可以通过锚定接入到NGN和IMS下以应用本发明实现呼叫等待。It should be noted that the present invention can be applied to terminals under both NGN and IMS, such as SIP hard terminals (SIP high-end phones with video capabilities and SIP low-end phones without video capabilities), SIP soft terminals (PC clients), POTS (Plain Old Telephone Service, plain old-fashioned telephone service) user etc., in addition the terminal under GSM, CDMA, PSTN also can be connected under NGN and IMS by anchoring to realize call waiting by applying the present invention.

以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.