Voice over internet protocol based on call forwarding

The invention discloses a voice over internet protocol based on call forwarding. The specific application is as follows that: 1, an overseas user calls a domestic user; and 2, the domestic user calls the overseas user. A function that the overseas user can answer a call from the domestic user is realized. A core of a call forwarding function is that on the premise that a call forwarding platform does not answer calling information of the domestic user, calling information and called information of the call are obtained, a request is notified to an overseas mobile phone APP user through a PS domain, and a calling function of the mobile phone APP user is called for realizing a capability of answering the call overseas by the APP user. According to the voice over internet protocol, domestic and overseas communication is convenient, and the charge is low. 本发明公开了种基于呼叫转移的网络电话。其中，具体应用如下：1、境外主叫境内。2、境内主叫境外。最终实现境外用户可以接听国内用户来电的功能；上述呼叫转移功能的核心在于呼转平台在未接通境内用户的主叫信息的前提下，获取了呼叫的主被叫信息，之后通过PS域将该请求通知到境外的手机APP用户，最终调用手机APP用户的主叫功能，实现