PJSIP是一个开放源代码的SIP协议栈，它支持多种SIP的扩展功能 。它的实现是为了能在嵌入式设备上高效实现SIP/VOIP。-PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. It combines sign