Peers is a very minimalistic SIP User-Agent. It s a softphone, written in java, and it has been tested on linux and windows. It allows a user to call from one PC to another on a local area network, using SIP/SDP/RTP with Ulaw encoding for voice.

It is Softphone source code using java

支持sip通话的sip电话软终端，java版本!(SIP Phone soft terminal supporting SIP calls, Java version!)