In the progress of evolution to IP network, we can use an access gateway system with SIP to realize the communication between wireless terminals of SCDMA and PSTN users using the standard softswitch.

• 在向IP网演进的过程中，通过具备SIP协议转换的接入网关系统，可以在原有架构基础上，利用与标准软交换设备的对接，实现SCDMA无线终端与公共电话网的互通。