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发明授权
CN101472326B 一种实现异系统间语音业务切换的方法和终端 失效 - 权利终止

一种实现异系统间语音业务切换的方法和终端
摘要：
本发明实施例公开了一种实现异系统间语音业务切换的方法，包括：处于分组交换PS域的呼叫终端在向电路CS域发起域转换之前，向IP媒体系统IMS发起会话初始协议SIP注册请求；所述呼叫终端在收到所述IMS返回的所述SIP注册请求的响应后，向所述CS域发起域转换。同时，本发明实施例还公开了一种实现异系统间语音业务切换的方法和用于实现异系统间语音业务切换的终端。本发明能够在发起域转换时，确保有充足的SIP注册时间完成后续的语音业务以及回切，使源系统中与SIP相关的资源不会因SIP注册超时而被释放掉，从而保证了所述呼叫终端回切至源系统时能够获得所需的PS域相关的信息资源，而实现成功回切。
摘要（英）：

The embodiment of the invention discloses a method for realizing voice service switching among dissimilar systems. The method comprises the following steps: before initiating domain switching for the CS domain of a circuit, a calling terminal located in a packet switching PS domain sends a session initiation protocol (SIP) registering request to IP media system (IMS); after receiving the respond of the SIP registering request returned by IMS, the calling terminal initiates the domain switching for the CS domain of the circuit. Meanwhile, the embodiment of the invention discloses a method for realizing voice service switching among the dissimilar systems. The invention ensures that the time for SIP registration is sufficient when domain switching is initiated, so as to finish subsequent vice service and cut back, and resource related to SIP in a source system is enabled not to be released because of overtime of SIP registration. Therefore, the calling terminal can obtain the information resource related to the needed PS domain when cutting back to the resource system.

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