一个著名的SIP协议栈，应用于sipX和resiprocate中。-a well-known SIP protocol stack, and application sipX resiprocate China.

著名开源软件sipX中的sipXPortLib,和其它组件一起工作，形成SIPX的统一整体-famous open source software sipX the sipXPortLib, and other components work together, formation of the unified whole SIPX