WO2010133146A1 - 一种实现转移类业务的方法、系统及装置 - Google Patents

一种实现转移类业务的方法、系统及装置 Download PDF

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Publication number
WO2010133146A1
WO2010133146A1 PCT/CN2010/072716 CN2010072716W WO2010133146A1 WO 2010133146 A1 WO2010133146 A1 WO 2010133146A1 CN 2010072716 W CN2010072716 W CN 2010072716W WO 2010133146 A1 WO2010133146 A1 WO 2010133146A1
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Prior art keywords
user
media
calling user
calling
transfer service
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PCT/CN2010/072716
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English (en)
French (fr)
Inventor
靳彬
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中兴通讯股份有限公司
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Publication of WO2010133146A1 publication Critical patent/WO2010133146A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1093—In-session procedures by adding participants; by removing participants
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1094—Inter-user-equipment sessions transfer or sharing

Definitions

  • the present invention relates to an IP multimedia subsystem, and more particularly to a method, system and apparatus for implementing a transfer type service.
  • IP Multimedia Subsystem is an IP-based network architecture proposed by the third-generation partner 'K 3rd Generation Partnership Project, 3GPP.
  • IP Internet Protocol
  • IMS Internet Multimedia Subsystem
  • control layer In the IMS system, the control layer and the service layer are separated.
  • the control layer does not provide specific services. It is only responsible for providing the necessary control functions such as triggering, routing, and accounting to the service layer.
  • the control function of the control layer is implemented by the Call Session Control Function (CSCF).
  • CSCF Call Session Control Function
  • the CSCF is divided into a Proxy Call Session Control Function (P-CSCF), an Interrogating Call Session Control Function (I-CSCF), and a Serving Call Session Control Function. , referred to as S-CSCF for short).
  • the service layer consists of a series of application servers (ASs) that can provide specific service services.
  • the AS can be an independent entity or an S-CSCF.
  • the S-CSCF controls the service trigger according to the subscription information of the user, invokes the service on the AS, and implements the service function.
  • AS and S-CSCF can be collectively referred to as Server Equipment (SE).
  • SE Server Equipment
  • the end-to-end device in the session is called User Equipment (UE) and is responsible for interaction with the user.
  • the initial session protocol (Session Initialion Protocol, SIP) is used for communication between the functional entities in the IMS.
  • the transfer service is an important type of service in the IMS.
  • the trigger condition of the call transfer is satisfied, the media negotiation in the call channel is completed, and when a new call is initiated, normal media negotiation can be performed.
  • the calling user A calls the called user B, and the called user B signs the one-way running service, and goes to the user C, the user D and the user E, and the called user B.
  • B2BUA No. Back-To-Back User Agent
  • the call channel between the calling user A and the called user B's No. 1 pass-through AS is called forward. Channel; the call channel of the called user B's No.
  • the backward channel where the call channel to the user C is called the backward channel 1;
  • the call channel of D is called backward channel 2;
  • the call channel of smoothing to user E is called backward channel 3; in the scenario of end-to-end media negotiation, the forward channel is unique, and the backward channel is not unique. of.
  • the user C if user C also signs a forwarding service or a one-way transmission service, and the trigger condition of the called user B is smooth, the user C is called, and if the user C is triggered, No. 1 passes the Shunzheng service or forwards the service several times, and the call finally reaches the user N.
  • the calling user A and the user N pass the media negotiation to the channel 1 and the forward channel, the called user B's number one
  • the trigger condition is met (such as timeout and smooth)
  • the user D is called, the backward channel 2 is established, and the backward channel 1 is released, and the calling user A and the user N are in progress in the forward channel.
  • Media negotiation in the case that the offer/answer model is not completed, media negotiation between the calling user A and the user D cannot be performed.
  • Figure 2 shows the signaling interaction between the called user B and the forward-synchronized AS of the called user B when the media negotiation of the forward channel is performed, including:
  • the called subscriber B's No.1 pass-through AS (referred to as AS) sends a release message (Cancel) to the user N;
  • the AS sends a session invitation (Invite) message to user D, and establishes a backward channel 2;
  • the user D After receiving the Invite message, the user D returns a response message (18x) of the Invite message to the AS, and carries its own media information in the 18x message.
  • the AS After receiving the 18x message, the AS cannot send the 18x message carrying the media of the user D to the calling user A because the offer/answer model is not completed in the forward channel, and the media negotiation cannot be performed, and the smoothing call fails.
  • the above problem may also occur when the calling user A and the called user B perform media negotiation, and the call is transferred to the user C.
  • the service fails due to the media negotiation between the calling user A and the user C.
  • the technical problem to be solved by the present invention is to provide a method and system for implementing a transfer type service, and to solve the problem that when a calling user and a user perform media negotiation, the call is transferred to a third-party user, because the calling user and the third-party user cannot be performed.
  • Media negotiation leads to business failure.
  • a method for implementing a transfer service includes: a calling user and a second user performing media negotiation;
  • the application server AS of the transfer service transfers the call to the third-party user, and completes the proposed offer/answer answer model of the media negotiation between the calling user and the second user, and performs the calling user and the third-party user.
  • Media consultation When the triggering condition is met, the application server AS of the transfer service transfers the call to the third-party user, and completes the proposed offer/answer answer model of the media negotiation between the calling user and the second user, and performs the calling user and the third-party user.
  • the AS of the transfer service Before the trigger condition is met, if the AS of the transfer service has sent a media update request carrying the media information of the calling user to the second user, completing the offer/answer model of the media negotiation performed by the calling user and the second user
  • the steps include:
  • the AS of the transfer service sends a media update response to the calling user, and the media update response carries the fake media constructed according to the media information of the calling user.
  • the AS of the transfer type service transfers the call to the third party user, and if the AS of the transfer type service receives the media update request of the calling user carrying the media information of the calling user, the calling user is completed.
  • the steps of the offer/answer model of the media negotiation performed by the second user include:
  • the AS of the transfer service sends a media update response to the calling user, and the media update response carries the fake media constructed according to the media information of the calling user.
  • the steps of completing the offer/answer model of media negotiation performed by the calling user and the second user include:
  • the AS of the transfer service terminates the media update after receiving the media update response from the calling user.
  • the mouth should be.
  • the AS of the transfer service has sent a media update request to the calling user
  • the offer/answer model of the media negotiation performed by the calling user and the second user is completed, and the calling user and the third party user are performed.
  • the steps of media negotiation include:
  • the AS of the transfer service caches the media information of the third user carried in the response message;
  • the AS of the transfer service After receiving the media update response of the calling user, the AS of the transfer service terminates the media update response;
  • the AS of the transfer service sends the media information of the cached third user to the calling user.
  • a system for implementing a transfer service includes: a calling user, a second user, a third user, and an AS of a transfer service, where:
  • the AS of the transfer service is set as follows: When the calling user and the second user perform media negotiation and the trigger condition is met, the call is transferred to the third-party user, and the offer/answer of the media negotiation performed by the calling user and the second user is completed. Model, media negotiation between the calling user and the third party user.
  • the AS of the transfer service is further configured to: send a media update request carrying the media information of the calling user to the second user before the trigger condition is met;
  • the AS of the transfer type service is an offer/answer model configured to complete the media negotiation between the calling user and the second user in the following manner: sending a media update response to the calling user, and carrying the media update response according to the calling user The fake media of the media information structure.
  • the AS of the transfer service is further configured to: when the trigger condition is met, transfer the call to the third party user, and receive the media update request of the calling user that carries the media information of the calling user;
  • the AS of the transfer type service is an offer/answer model configured to complete the media negotiation between the calling user and the second user in the following manner: sending a media update response to the calling user, and carrying the media update response according to the calling user The fake media of the media information structure.
  • the AS of the transfer service is further configured to: send a media update request to the calling user before the trigger condition is satisfied; the AS of the transfer service is set to complete the media negotiation performed by the calling user and the second user in the following manner /answer model: After receiving the media update response from the calling user, the end The media update responds.
  • the AS of the transfer service is further configured to: send a media update request to the calling user before the trigger condition is satisfied; the AS of the transfer service is set to complete the media negotiation performed by the calling user and the second user in the following manner /answer model, performing media negotiation between the calling user and the third-party user: after receiving the response message of the third user, buffering the media information of the third user carried in the response message; receiving the media update response of the calling user Ending the media update response; sending the cached third user's media information to the calling user.
  • the present invention also provides an application server (AS) for a transfer service, the AS is configured to: transfer a call to a third party when the calling user performs media negotiation with the second user and the trigger condition of the second user is met The user completes an offer/answer model of the media negotiation performed by the calling user and the second user, and performs media negotiation between the calling user and the third-party user.
  • AS application server
  • the AS is further configured to: send a media update request carrying the media information of the calling user to the second user before the trigger condition is met;
  • the AS is an offer/answer model configured to complete the media negotiation performed by the calling user and the second user in the following manner: sending a media update response to the calling user, and carrying the media update response according to the A fake media constructed by the media information of the calling user.
  • the AS is further configured to: when the trigger condition is met, when the call is transferred to the third-party user, receiving, by the calling user, a media update request that carries the media information of the calling user;
  • the AS is an offer/answer model configured to complete the media negotiation performed by the calling user and the second user in the following manner: sending a media update response to the calling user, and carrying the media update response according to the A fake media constructed by the media information of the calling user.
  • the AS is further configured to: send media to the calling user before the trigger condition is met New request;
  • the AS is an offer/answer model configured to complete the media negotiation between the calling user and the second user in the following manner: After receiving the media update response of the calling user, the media update response is terminated.
  • the AS of the transfer service is further configured to: send a media update request to the calling user before the trigger condition is met;
  • the AS of the transfer service is an offer/answer model that is configured to complete the media negotiation performed by the calling user and the second user in the following manner, and performs media negotiation between the calling user and the third-party user:
  • the present invention completes the offer/answer model of media negotiation performed by the calling user in the forward channel, so that the calling user can perform media negotiation with the third-party user to which the call is transferred to implement call forwarding. business.
  • FIG. 1 is a schematic diagram of a call channel of a first-number pass-through vibration service in the prior art
  • FIG. 2 is a signaling diagram of triggering a transfer type service when a calling user performs media negotiation in the prior art
  • FIG. 3 is a signaling interaction diagram according to Embodiment 1 of the present invention
  • Embodiment 4 is a signaling interaction diagram of Embodiment 2 of the present invention.
  • Embodiment 3 is a signaling interaction diagram of Embodiment 3 of the present invention.
  • Embodiment 4 of the present invention is a signaling interaction diagram of Embodiment 4 of the present invention.
  • FIG. 7 is a block diagram of the system of the present invention. Preferred embodiment of the invention
  • the forward channel and the third-party user to which the call is transferred need to be used for media negotiation. If the media negotiation performed by the calling user in the forward channel is not completed, The media negotiation between the calling user and the third-party user to which the call is transferred cannot be performed.
  • the present invention completes the offer/answer model of the media negotiation performed by the calling user in the forward channel, and then performs the calling party and the third party to which the call is transferred. User's media negotiation.
  • the caller B is still called by the calling user A, and the called user B signs the one-way pass-through service, and goes to the user C, the user D and the user E.
  • the user C also signs a forward-transfer service or the number one.
  • the method of the present invention will be described by taking the Shunzhen vibration business as an example.
  • FIG. 3 shows a method for implementing media negotiation between the calling user A and the user D when the AS has sent a media update request to the user N when the triggering condition of the synchronous call user D is satisfied, including: 301: AS receiving After the media information of the calling user A, the media update request is sent to the user N.
  • the media update request carries the media information of the calling user A;
  • the trigger condition of the forward call user D is satisfied, the AS sends a media update response (answer) to the calling user A, and the media update response carries the fake media constructed according to the media information of the calling user A carried in the offer;
  • the calling user A After receiving the media update response, the calling user A is in the inactive state, and no longer negotiates media with the user N.
  • the offer/answer model in the forward channel is completed, and media negotiation can be performed.
  • the AS sends a release message to user N.
  • the AS sends a session invitation (Invite) message to user D.
  • the user D After receiving the Invite message, the user D returns a response message of the Invite message to the AS, where the response message carries its own media information.
  • the AS After receiving the response message of the user D, the AS sends the media information of the user D to the calling user A through the forward channel to perform media negotiation.
  • Example 2 After receiving the response message of the user D, the AS sends the media information of the user D to the calling user A through the forward channel to perform media negotiation.
  • Example 2 After receiving the response message of the user D, the AS sends the media information of the user D to the calling user A through the forward channel to perform media negotiation.
  • Example 2 After receiving the response message of the user D, the AS sends the media information of the user D to the calling user A through the forward channel to perform media negotiation.
  • Figure 4 shows a method for the AS to receive the media update request from the calling user A after the user D is called, and the media negotiation between the calling user A and the user D is performed.
  • the trigger condition of the forward call user D is satisfied, and the AS sends a release message to the user N.
  • the calling user A sends a media update request to the AS, and carries the media information of the calling user A.
  • the AS After receiving the media update request of the calling user A, the AS sends a media update response to the calling user A, where the media update response carries the media structure constructed according to the media of the calling user A carried in the offer;
  • User D returns a response message of the Invite message to the AS, and carries its own media information in the response message.
  • the AS After receiving the response message of the user D, the AS sends the media information of the user D to the calling user A through the forward channel to perform media negotiation.
  • Example 3 After receiving the response message of the user D, the AS sends the media information of the user D to the calling user A through the forward channel to perform media negotiation.
  • FIG. 5 shows a method for implementing media negotiation between the calling user A and the user D in the case that the AS has sent a media update request to the calling user A before the triggering condition of the calling user D is satisfied, including:
  • the AS sends a media update request to the calling user A, where the media update request carries the media information of the user N.
  • the trigger condition of the forward call user D is satisfied, and the AS sends a release message to the user N.
  • the AS sends an Invite message to the user D.
  • the calling user A returns a media update response to the AS;
  • the AS After receiving the media update response of the calling user A, the AS terminates the media update response, that is, the media information carried in the media update response message is not forwarded;
  • the AS receives the media update response of the calling user A, and terminates the media update response, indicating that the offer/answer model in the forward channel is completed, and the media negotiation between the calling user A and the user N is no longer performed. Therefore, media negotiation between the calling user A and the user D can be performed.
  • User D returns a response message of the Invite message to the AS, and carries its own media information in the response message.
  • the AS After receiving the response message of the user D, the AS sends the media information of the user D to the calling user A through the forward channel to perform media negotiation.
  • FIG. 6 shows that before the trigger condition of the forward call user D is satisfied, the AS has sent a media update request to the calling user A, and has not received the calling user A before receiving the response message of the user D to the Invite message.
  • a method for implementing media negotiation between the calling user A and the user D includes:
  • the AS sends a media update request to the calling user A, where the media update request carries the media information of the user N.
  • 602 The trigger condition of the forward call user D is satisfied, and the AS sends a release message to the user N.
  • 603 The AS sends an Invite message to the user D.
  • User D returns a response message of the Invite message to the AS, and carries its own media information in the response message.
  • the AS caches the media information of the user D carried in the response message of the Invite message returned by the user D.
  • the calling user A returns a media update response to the AS;
  • the AS After receiving the media update response of the calling user A, the AS terminates the media update response message, that is, the media information carried in the media update response message is not forwarded;
  • the AS sends the cached user D media information to the calling user A through the forward channel to perform media negotiation.
  • FIG. 7 is a system for implementing a transfer service according to the present invention, including: a calling user, a second user, a third user, and an AS of a transfer service, where:
  • a calling user configured to perform media negotiation with the second user
  • the AS of the transfer service is used to transfer the call to the third-party user when the trigger condition is satisfied, and complete the offer/answer model of the media negotiation between the calling user and the second user, and perform the caller and the third-party user.
  • the AS of the transfer service is further configured to send a media update request carrying the media information of the calling user to the second user before the trigger condition is met;
  • the method for the AS of the transfer service to complete the offer/answer model of the media negotiation between the calling user and the second user is: sending a media update response to the calling user, and carrying the media information according to the calling user in the media update response Constructed fake media.
  • the AS of the transfer service is further configured to: when the trigger condition is met, transfer the call to the third party user, and receive the media update request of the calling user that carries the media information of the calling user;
  • the method for the AS of the transfer service to complete the offer/answer model of the media negotiation between the calling user and the second user is: sending a media update response to the calling user, and carrying the media information according to the calling user in the media update response Constructed fake media.
  • the AS of the transfer service is also used to send a media update request to the calling user before the trigger condition is met;
  • the AS of the transfer service completes the offer/answer model of the media negotiation between the calling user and the second user as follows: After receiving the media update response of the calling user, the media update response is terminated.
  • the AS of the transfer service is also used to send a media update request to the calling user before the trigger condition is met;
  • the AS of the transfer service completes the offer/answer model of media negotiation between the calling user and the second user, and the method for media negotiation between the calling user and the third party is:
  • the present invention completes the offer/answer model of the media negotiation performed by the calling user in the forward channel, so that the calling user can perform media negotiation with the third party user to which the call is transferred to implement the call forwarding service.

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Abstract

本发明公开了一种实现转移类业务的方法、系统及装置，所述方法包括：主叫用户与第二用户进行媒体协商；以及在触发条件满足时，转移类业务的AS将呼叫转移到第三方用户，完成所述主叫用户与第二用户所进行的媒体协 商的offer/ answer模型，进行所述主叫用户与所述第三方用户的媒体协商。应用本发明，在前向通道中完成主叫用户所进行的媒体协商的offer/answer 模型，从而使主叫用户能够与呼叫转移到的第三方用户进行媒体协商，以实现呼叫转接业务。

Description

一种实现转移类业务的方法、 系统及装置
技术领域
本发明涉及 IP多媒体子系统， 尤其涉及一种实现转移类业务的方法、 系 统及装置。
背景技术
网络互联协议 ( Internet Protocol, IP )多媒体子系统 ( IP Multimedia Core Network Subsystem, IMS )是由第三代合作伙伴计戈 'K 3rd Generation Partnership Project, 3GPP )提出的一种基于 IP的网络架构， 构建了一个开放而灵活的业 务环境， 支持多媒体应用， 能够为用户提供丰富的多媒体业务。
在 IMS体系中， 控制层和业务层是分离的， 控制层不提供具体业务， 只 负责向业务层提供必要的触发、 路由和计费等控制功能。 控制层的控制功能 是由呼叫会话控制功能（Call Session Control Function, 简称 CSCF ) 完成的。
CSCF分为代理呼叫会话控制功能（ Proxy Call Session Control Function, 简称 P-CSCF ) 、 查询呼叫会话控制功能（Interrogating Call Session Control Function,简称 I-CSCF )和服务呼叫会话控制功能（ Serving Call Session Control Function, 简称 S-CSCF )三种类型。 业务层由一系列应用服务器（ Application Server, AS )组成， 能提供具体业务服务， AS可以是独立的实体， 也可以存 在于 S-CSCF中。 S-CSCF根据用户的签约信息控制业务触发， 调用 AS上的 业务，实现业务功能。 AS和 S-CSCF可以统称为服务设备（ Server Equipment , 简称 SE ) 。 会话中的端到端设备称为用户设备（User Equipment, UE ) , 负 责与使用者的交互。 在 IMS 中各功能实体之间使用初始会话协议（Session Initialion Protocol, SIP )进行通讯。
转移类业务是 IMS中一类重要的业务， 在理想状态下， 呼叫转移的触发 条件满足时， 呼叫通道中的媒体协商已经完成， 发起新的呼叫时， 能够进行 正常的媒体协商。 但是， 在有些情况下， 如一号通顺振业务与前转类业务相 互嵌套的复杂场景中， 可能存在呼叫通道中仍在进行媒体协商， 而呼叫转移 的触发条件已满足的情况， 此时主叫用户无法与待转移到的用户进行媒体协 商， 导致呼叫转移业务失败。
例如， 如图 1所示， 主叫用户 A呼叫被叫用户 B, 被叫用户 B签约有一 号通顺振业务， 顺振到用户 C、 用户 D和用户 E, 在被叫用户 B的一号通顺 振 AS釆用背靠背用户代理（ Back-To-Back User Agent, B2BUA )模式时， 将 主叫用户 A到被叫用户 B的一号通顺振 AS之间的呼叫通道称为前向通道； 被叫用户 B的一号通顺振 AS到不同顺振用户之间的呼叫通道称为后向通道， 其中， 顺振到用户 C的呼叫通道称为后向通道 1； 顺振到用户 D的呼叫通道 称为后向通道 2; 顺振到用户 E的呼叫通道称为后向通道 3; 在进行端到端媒 体协商的场景下， 前向通道是唯一的， 后向通道是不唯一的。
参照图 1 ,若用户 C也签约有前转类业务或一号通顺振业务，被叫用户 B 一号通顺振的触发条件满足时， 顺振呼叫用户 C, 此时若触发用户 C的一号 通顺振业务或多次前转业务， 并且呼叫最终落地到用户 N, 在主叫用户 A与 用户 N通过后向通道 1和前向通道进行媒体协商时， 被叫用户 B的一号通顺 振 AS 由于触发条件满足（比如超时顺振） 而顺振呼叫用户 D, 建立后向通 道 2, 并释放后向通道 1 , 而由于前向通道中正在进行主叫用户 A与用户 N 的媒体协商， 在未完成提议 /应答（offer/answer )模型的情况下， 无法进行主 叫用户 A与用户 D的媒体协商。
图 2所示为前向通道进行媒体协商时， 被叫用户 B顺振触发条件满足， 被叫用户 B的一号通顺振 AS进行的信令交互， 包括：
201 : 被叫用户 B的一号通顺振 AS (简称： AS )向用户 N发送释放消息 ( Cancel ) ；
202: AS向用户 D发送会话邀请 ( Invite ) 消息， 建立后向通道 2;
203：用户 D接收到 Invite消息后，向 AS返回 Invite消息的响应消息（ 18x ), 在 18x消息中携带其自身的媒体信息；
203: AS接收到 18x消息后， 由于前向通道中未完成 offer/answer模型， 无法将携带用户 D的媒体的 18x消息发送给主叫用户 A,无法进行媒体协商， 顺振呼叫失败。 上述问题也可能发生在主叫用户 A与被叫用户 B进行媒体协商时，呼叫 转移到用户 C, 由于无法进行主叫用户 A与用户 C的媒体协商导致业务失败 等情况。 发明内容
本发明要解决的技术问题是提供一种实现转移类业务的方法及系统， 解 决主叫用户与一用户进行媒体协商时， 呼叫转移到第三方用户， 由于无法进 行主叫用户与第三方用户的媒体协商导致业务失败的问题。
为解决上述技术问题， 本发明的一种实现转移类业务的方法， 包括： 主叫用户与第二用户进行媒体协商； 以及
在触发条件满足时， 转移类业务的应用服务器 AS将呼叫转移到第三方 用户， 完成主叫用户与第二用户所进行的媒体协商的提议 offer/应答 answer 模型， 进行主叫用户与第三方用户的媒体协商。
在触发条件满足前， 若转移类业务的 AS 已向第二用户发送携带主叫用 户的媒体信息的媒体更新请求， 则完成主叫用户与第二用户所进行的媒体协 商的 offer/answer模型的步骤包括：
转移类业务的 AS 向主叫用户发送媒体更新响应， 在该媒体更新响应中 携带根据主叫用户的媒体信息构造的假媒体。
在触发条件满足， 转移类业务的 AS将呼叫转移到第三方用户时， 若转 移类业务的 AS接收到主叫用户的携带该主叫用户的媒体信息的媒体更新请 求，则完成主叫用户与第二用户所进行的媒体协商的 offer/answer模型的步骤 包括：
转移类业务的 AS 向主叫用户发送媒体更新响应， 在该媒体更新响应中 携带根据主叫用户的媒体信息构造的假媒体。
在触发条件满足前， 若转移类业务的 AS 已向主叫用户发送媒体更新请 求，则完成主叫用户与第二用户所进行的媒体协商的 offer/answer模型的步骤 包括：
转移类业务的 AS接收到主叫用户的媒体更新响应后， 终结该媒体更新 口向应。
在触发条件满足前， 若转移类业务的 AS 已向主叫用户发送媒体更新请 求， 则完成主叫用户与第二用户所进行的媒体协商的 offer/answer模型， 进行 主叫用户与第三方用户的媒体协商的步骤包括：
转移类业务的 AS接收到第三用户的响应消息后， 緩存该响应消息中携 带的第三用户的媒体信息；
转移类业务的 AS接收到主叫用户的媒体更新响应后， 终结该媒体更新 响应； 以及
转移类业务的 AS将緩存的第三用户的媒体信息发送给主叫用户。
一种实现转移类业务的系统， 包括： 主叫用户、 第二用户、 第三用户和 转移类业务的 AS, 其中：
转移类业务的 AS设置为： 在主叫用户与第二用户进行媒体协商且触发 条件满足时， 将呼叫转移到第三方用户， 完成主叫用户与第二用户所进行的 媒体协商的 offer/answer模型， 进行主叫用户与第三方用户的媒体协商。
转移类业务的 AS还设置为： 在触发条件满足前向第二用户发送携带主 叫用户的媒体信息的媒体更新请求；
转移类业务的 AS是设置为以如下方式完成主叫用户与第二用户所进行 的媒体协商的 offer/answer模型： 向主叫用户发送媒体更新响应， 在该媒体更 新响应中携带根据主叫用户的媒体信息构造的假媒体。
转移类业务的 AS还设置为： 在触发条件满足， 将呼叫转移到第三方用 户时， 接收主叫用户的携带该主叫用户的媒体信息的媒体更新请求；
转移类业务的 AS是设置为以如下方式完成主叫用户与第二用户所进行 的媒体协商的 offer/answer模型： 向主叫用户发送媒体更新响应， 在该媒体更 新响应中携带根据主叫用户的媒体信息构造的假媒体。
转移类业务的 AS还设置为： 在触发条件满足前， 向主叫用户发送媒体 更新请求； 转移类业务的 AS是设置为以如下方式完成主叫用户与第二用户所进行 的媒体协商的 offer/answer模型： 在接收到主叫用户的媒体更新响应后， 终结 该媒体更新响应。
转移类业务的 AS还设置为： 在触发条件满足前， 向主叫用户发送媒体 更新请求； 转移类业务的 AS是设置为以如下方式完成主叫用户与第二用户所进行 的媒体协商的 offer/answer模型， 进行主叫用户与第三方用户的媒体协商： 接收到第三用户的响应消息后， 緩存该响应消息中携带的第三用户的媒 体信息； 接收到主叫用户的媒体更新响应后， 终结该媒体更新响应； 将緩存 的第三用户的媒体信息发送给主叫用户。 本发明还提供一种转移类业务的应用服务器（AS ) , 该 AS设置为： 在主叫用户与第二用户进行媒体协商且所述第二用户的触发条件满足 时， 将呼叫转移到第三方用户， 完成所述主叫用户与第二用户所进行的媒体 协商的提议（offer ) /应答（answer )模型， 进行所述主叫用户与所述第三方 用户的媒体协商。
如权利要求 11所述的 AS,
该 AS还设置为： 在所述触发条件满足前向第二用户发送携带所述主叫 用户的媒体信息的媒体更新请求；
该 AS是设置为以如下方式完成所述主叫用户与第二用户所进行的媒体 协商的 offer/answer模型： 向所述主叫用户发送媒体更新响应， 在该媒体更新 响应中携带根据所述主叫用户的媒体信息构造的假媒体。
如权利要求 11所述的 AS ,
该 AS还设置为： 在触发条件满足， 将呼叫转移到第三方用户时， 接收 所述主叫用户的携带该主叫用户的媒体信息的媒体更新请求；
该 AS是设置为以如下方式完成所述主叫用户与第二用户所进行的媒体 协商的 offer/answer模型： 向所述主叫用户发送媒体更新响应， 在该媒体更新 响应中携带根据所述主叫用户的媒体信息构造的假媒体。
如权利要求 11所述的 AS,
该 AS还设置为： 在所述触发条件满足前， 向所述主叫用户发送媒体更 新请求；
该 AS是设置为以如下方式完成所述主叫用户与第二用户所进行的媒体 协商的 offer/answer模型： 在接收到所述主叫用户的媒体更新响应后， 终结该 媒体更新响应。
如权利要求 11所述的 AS,
所述转移类业务的 AS还设置为： 在所述触发条件满足前， 向所述主叫 用户发送媒体更新请求；
所述转移类业务的 AS是设置为以如下方式完成所述主叫用户与第二用 户所进行的媒体协商的 offer/answer模型，进行所述主叫用户与所述第三方用 户的媒体协商：
接收到所述第三用户的响应消息后， 緩存该响应消息中携带的所述第三 用户的媒体信息； 接收到所述主叫用户的媒体更新响应后， 终结该媒体更新 响应； 将緩存的第三用户的媒体信息发送给所述主叫用户。
综上所述， 本发明在前向通道中完成主叫用户所进行的媒体协商的 offer/answer模型， 从而使主叫用户能够与呼叫转移到的第三方用户进行媒体 协商， 以实现呼叫转接业务。
附图概述
图 1为现有技术中一号通顺振业务的呼叫通道示意图；
图 2为现有技术中主叫用户进行媒体协商时触发转移类业务的信令图； 图 3为本发明实施例 1的信令交互图；
图 4为本发明实施例 2的信令交互图；
图 5为本发明实施例 3的信令交互图；
图 6为本发明实施例 4的信令交互图；
图 7为本发明系统的架构图。 本发明的较佳实施方式
触发转移类业务后， 由于前向通道的唯一性， 需要使用该前向通道和呼 叫转移到的第三方用户进行媒体协商， 而如果前向通道中主叫用户所进行的 媒体协商尚未完成， 就无法进行主叫用户与呼叫转移到的第三方用户的媒体 协商， 本发明在前向通道完成主叫用户所进行的媒体协商的 offer/answer模 型， 进而进行主叫用户与呼叫转移到的第三方用户的媒体协商。
下面结合附图对本发明的具体实施方法进行说明。
下面仍以主叫用户 A呼叫被叫用户 B, 被叫用户 B签约有一号通顺振业 务， 顺振到用户 C、 用户 D和用户 E, 用户 C也签约有前转类业务或一号通 顺振业务为例， 对本发明的方法进行说明。
实施例 1 :
图 3所示为在顺振呼叫用户 D的触发条件满足时， AS已向用户 N发送 媒体更新请求的情况下，实现主叫用户 A与用户 D的媒体协商的方法，包括： 301 : AS接收到主叫用户 A的媒体信息后， 向用户 N发送媒体更新请求
( offer ) , 该媒体更新请求中携带有主叫用户 A的媒体信息；
302: 顺振呼叫用户 D的触发条件满足， AS向主叫用户 A发送媒体更新 响应（answer ) , 在媒体更新响应中携带根据 offer中携带的主叫用户 A的媒 体信息构造的假媒体；
主叫用户 A接收到媒体更新响应后，媒体工作方式处于非激活（ inactive ) 状态， 不再与用户 N进行媒体协商， 前向通道中的 offer/answer模型完成， 可 以进行媒体协商。
303: AS向用户 N发送释放消息；
304: AS向用户 D发送会话邀请 ( Invite ) 消息；
305： 用户 D接收到 Invite消息后 , 向 AS返回 Invite消息的响应消息 , 在该响应消息中携带其自身的媒体信息；
306: AS接收到用户 D的响应消息后， 通过前向通道将用户 D的媒体信 息发送给主叫用户 A, 进行媒体协商。 实施例 2:
图 4所示为在顺振呼叫用户 D后， AS收到主叫用户 A的媒体更新请求， 实现主叫用户 A与用户 D的媒体协商的方法， 包括：
401 : 顺振呼叫用户 D的触发条件满足， AS向用户 N发送释放消息；
402: AS向用户 D发送 Invite消息；
403:主叫用户 A向 AS发送媒体更新请求，携带主叫用户 A的媒体信息；
404: AS接收到主叫用户 A的媒体更新请求后， 向主叫用户 A发送媒体 更新响应，在媒体更新响应中携带根据 offer中携带的主叫用户 A的媒体构造 的艮媒体；
405: 用户 D向 AS返回 Invite消息的响应消息， 在该响应消息中携带其 自身的媒体信息；
406: AS接收到用户 D的响应消息后， 通过前向通道将用户 D的媒体信 息发送给主叫用户 A, 进行媒体协商。 实施例 3:
图 5所示为在顺振呼叫用户 D的触发条件满足前， AS已向主叫用户 A 发送媒体更新请求的情况下， 实现主叫用户 A与用户 D的媒体协商的方法， 包括：
501 : AS向主叫用户 A发送媒体更新请求， 该媒体更新请求中携带有用 户 N的媒体信息；
502: 顺振呼叫用户 D的触发条件满足， AS向用户 N发送释放消息；
503: AS向用户 D发送 Invite消息；
504: 主叫用户 A向 AS返回媒体更新响应；
505: AS接收到主叫用户 A的媒体更新响应后， 终结该媒体更新响应， 即不再转发媒体更新响应消息中携带的媒体信息；
AS接收到主叫用户 A的媒体更新响应， 并终结媒体更新响应表明前向 通道中的 offer/answer模型完成， 不再进行主叫用户 A与用户 N的媒体协商， 因此， 可以进行主叫用户 A与用户 D的媒体协商。
506: 用户 D向 AS返回 Invite消息的响应消息， 在该响应消息中携带其 自身的媒体信息；
507: AS接收到用户 D的响应消息后， 通过前向通道将用户 D的媒体信 息发送给主叫用户 A, 进行媒体协商。
实施例 4:
图 6所示为在顺振呼叫用户 D的触发条件满足前， AS已向主叫用户 A 发送媒体更新请求， 且在接收到用户 D对 Invite消息的响应消息前未接收到 主叫用户 A的媒体更新响应的情况下，实现主叫用户 A与用户 D的媒体协商 的方法， 包括：
601 : AS向主叫用户 A发送媒体更新请求， 该媒体更新请求中携带有用 户 N的媒体信息；
602: 顺振呼叫用户 D的触发条件满足， AS向用户 N发送释放消息； 603： AS向用户 D发送 Invite消息；
604: 用户 D向 AS返回 Invite消息的响应消息， 在该响应消息中携带其 自身的媒体信息；
605： AS緩存用户 D返回的 Invite消息的响应消息中携带的用户 D的媒 体信息；
606: 主叫用户 A向 AS返回媒体更新响应；
607: AS接收到主叫用户 A的媒体更新响应后， 终结该媒体更新响应消 息， 即不再转发媒体更新响应消息中携带的媒体信息；
608: AS将緩存的用户 D的媒体信息通过前向通道发送给主叫用户 A, 进行媒体协商。
图 7所示为本发明的实现转移类业务的系统， 包括： 主叫用户、 第二用 户、 第三用户和转移类业务的 AS, 其中：
主叫用户， 用于与第二用户进行媒体协商； 转移类业务的 AS, 用于在触发条件满足时， 将呼叫转移到第三方用户， 完成主叫用户与第二用户所进行的媒体协商的 offer/answer模型，进行主叫用 户与第三方用户的媒体协商。
转移类业务的 AS,还用于在触发条件满足前向第二用户发送携带主叫用 户的媒体信息的媒体更新请求；
转移类业务的 AS 完成主叫用户与第二用户所进行的媒体协商的 offer/answer模型的方法为： 向主叫用户发送媒体更新响应， 在该媒体更新响 应中携带根据主叫用户的媒体信息构造的假媒体。
转移类业务的 AS,还用于在触发条件满足，将呼叫转移到第三方用户时， 接收主叫用户的携带该主叫用户的媒体信息的媒体更新请求；
转移类业务的 AS 完成主叫用户与第二用户所进行的媒体协商的 offer/answer模型的方法为： 向主叫用户发送媒体更新响应， 在该媒体更新响 应中携带根据主叫用户的媒体信息构造的假媒体。
转移类业务的 AS,还用于在触发条件满足前， 向主叫用户发送媒体更新 请求；
转移类业务的 AS 完成主叫用户与第二用户所进行的媒体协商的 offer/answer模型的方法为： 在接收到主叫用户的媒体更新响应后， 终结该媒 体更新响应。
转移类业务的 AS,还用于在触发条件满足前， 向主叫用户发送媒体更新 请求；
转移类业务的 AS 完成主叫用户与第二用户所进行的媒体协商的 offer/answer模型， 进行主叫用户与第三方用户的媒体协商的方法为：
接收到第三用户的响应消息后， 緩存该响应消息中携带的第三用户的媒 体信息； 接收到主叫用户的媒体更新响应后， 终结该媒体更新响应； 将緩存 的第三用户的媒体信息发送给主叫用户。
当然， 本发明还可有其他多种实施例， 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 工业实用性
本发明在前向通道中完成主叫用户所进行的媒体协商的 offer/answer模 型， 从而使主叫用户能够与呼叫转移到的第三方用户进行媒体协商， 以实现 呼叫转接业务。

Claims

权 利 要 求 书
1、 一种实现转移类业务的方法， 包括：
主叫用户与第二用户进行媒体协商； 以及 在触发条件满足时， 转移类业务的应用服务器（AS )将呼叫转移到第三 方用户， 完成所述主叫用户与第二用户所进行的媒体协商的提议（offer ) /应 答（ answer )模型， 进行所述主叫用户与所述第三方用户的媒体协商。
2、 如权利要求 1所述的方法， 其中， 在所述触发条件满足前， 若所述转 移类业务的 AS 已向第二用户发送携带所述主叫用户的媒体信息的媒体更新 请求， 则所述完成所述主叫用户与第二用户所进行的媒体协商的 offer/answer 模型的步骤包括：
所述转移类业务的 AS 向所述主叫用户发送媒体更新响应， 在该媒体更 新响应中携带根据所述主叫用户的媒体信息构造的假媒体。
3、 如权利要求 1所述的方法， 其中， 在所述触发条件满足， 转移类业务 的 AS将呼叫转移到第三方用户时，若所述转移类业务的 AS接收到所述主叫 用户的携带该主叫用户的媒体信息的媒体更新请求， 则所述完成所述主叫用 户与第二用户所进行的媒体协商的 offer/answer模型的步骤包括：
所述转移类业务的 AS 向所述主叫用户发送媒体更新响应， 在该媒体更 新响应中携带根据所述主叫用户的媒体信息构造的假媒体。
4、 如权利要求 1所述的方法， 其中， 在所述触发条件满足前， 若所述转 移类业务的 AS 已向所述主叫用户发送媒体更新请求， 则所述完成所述主叫 用户与第二用户所进行的媒体协商的 offer/answer模型的步骤包括：
所述转移类业务的 AS接收到所述主叫用户的媒体更新响应后， 终结该 媒体更新响应。
5、 如权利要求 1所述的方法， 其中， 在所述触发条件满足前， 若所述转 移类业务的 AS 已向所述主叫用户发送媒体更新请求， 则所述完成所述主叫 用户与第二用户所进行的媒体协商的 offer/answer模型，进行所述主叫用户与 所述第三方用户的媒体协商的步骤包括：
所述转移类业务的 AS接收到所述第三用户的响应消息后， 緩存该响应 消息中携带的所述第三用户的媒体信息；
所述转移类业务的 AS接收到所述主叫用户的媒体更新响应后， 终结该 媒体更新响应； 以及
所述转移类业务的 AS将緩存的第三用户的媒体信息发送给所述主叫用 户。
6、 一种实现转移类业务的系统， 包括： 主叫用户、 第二用户、 第三用户 和转移类业务的应用服务器（AS ) ,
所述转移类业务的 AS设置为： 在所述主叫用户与所述第二用户进行媒 体协商且触发条件满足时， 将呼叫转移到所述第三方用户， 完成所述主叫用 户与第二用户所进行的媒体协商的提议 ( offer ) /应答（ answer )模型， 进行 所述主叫用户与所述第三方用户的媒体协商。
7、 如权利要求 6所述的系统， 其中，
所述转移类业务的 AS还设置为： 在所述触发条件满足前向第二用户发 送携带所述主叫用户的媒体信息的媒体更新请求；
所述转移类业务的 AS是设置为以如下方式完成所述主叫用户与第二用 户所进行的媒体协商的 offer/answer模型： 向所述主叫用户发送媒体更新响 应， 在该媒体更新响应中携带根据所述主叫用户的媒体信息构造的假媒体。
8、 如权利要求 6所述的系统， 其中，
所述转移类业务的 AS还设置为： 在触发条件满足， 将呼叫转移到第三 方用户时，接收所述主叫用户的携带该主叫用户的媒体信息的媒体更新请求； 所述转移类业务的 AS是设置为以如下方式完成所述主叫用户与第二用 户所进行的媒体协商的 offer/answer模型： 向所述主叫用户发送媒体更新响 应， 在该媒体更新响应中携带根据所述主叫用户的媒体信息构造的假媒体。
9、 如权利要求 6所述的系统， 其中， 所述转移类业务的 AS还设置为： 在所述触发条件满足前， 向所述主叫 用户发送媒体更新请求；
所述转移类业务的 AS是设置为以如下方式完成所述主叫用户与第二用 户所进行的媒体协商的 offer/answer模型：在接收到所述主叫用户的媒体更新 响应后， 终结该媒体更新响应。
10、 如权利要求 6所述的系统， 其中，
所述转移类业务的 AS还设置为： 在所述触发条件满足前， 向所述主叫 用户发送媒体更新请求；
所述转移类业务的 AS是设置为以如下方式完成所述主叫用户与第二用 户所进行的媒体协商的 offer/answer模型，进行所述主叫用户与所述第三方用 户的媒体协商：
接收到所述第三用户的响应消息后， 緩存该响应消息中携带的所述第三 用户的媒体信息； 接收到所述主叫用户的媒体更新响应后， 终结该媒体更新 响应； 将緩存的第三用户的媒体信息发送给所述主叫用户。
11、 一种转移类业务的应用服务器（AS ) , 该 AS设置为：
在主叫用户与第二用户进行媒体协商且所述第二用户的触发条件满足 时， 将呼叫转移到第三方用户， 完成所述主叫用户与第二用户所进行的媒体 协商的提议（offer ) /应答（answer )模型， 进行所述主叫用户与所述第三方 用户的媒体协商。
12、 如权利要求 11所述的 AS,
该 AS还设置为： 在所述触发条件满足前向第二用户发送携带所述主叫 用户的媒体信息的媒体更新请求；
该 AS是设置为以如下方式完成所述主叫用户与第二用户所进行的媒体 协商的 offer/answer模型： 向所述主叫用户发送媒体更新响应， 在该媒体更新 响应中携带根据所述主叫用户的媒体信息构造的假媒体。
13、 如权利要求 11所述的 AS, 该 AS还设置为： 在触发条件满足， 将呼叫转移到第三方用户时， 接收 所述主叫用户的携带该主叫用户的媒体信息的媒体更新请求；
该 AS是设置为以如下方式完成所述主叫用户与第二用户所进行的媒体 协商的 offer/answer模型： 向所述主叫用户发送媒体更新响应， 在该媒体更新 响应中携带根据所述主叫用户的媒体信息构造的假媒体。
14、 如权利要求 11所述的 AS,
该 AS还设置为： 在所述触发条件满足前， 向所述主叫用户发送媒体更 新请求；
该 AS是设置为以如下方式完成所述主叫用户与第二用户所进行的媒体 协商的 offer/answer模型： 在接收到所述主叫用户的媒体更新响应后， 终结该 媒体更新响应。
15、 如权利要求 11所述的 AS,
所述转移类业务的 AS还设置为： 在所述触发条件满足前， 向所述主叫 用户发送媒体更新请求；
所述转移类业务的 AS是设置为以如下方式完成所述主叫用户与第二用 户所进行的媒体协商的 offer/answer模型，进行所述主叫用户与所述第三方用 户的媒体协商：
接收到所述第三用户的响应消息后， 緩存该响应消息中携带的所述第三 用户的媒体信息； 接收到所述主叫用户的媒体更新响应后， 终结该媒体更新 响应； 将緩存的第三用户的媒体信息发送给所述主叫用户。
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