he source code for this package is located in src/ directory. The JAIN-SIP-SERVICES is a JAIN-SIP application: it does not need proprietary nist-sip classes in addition of those defined in JAIN-SIP 1.1, you can substitute the NIST-SIP stack by

这是一个基于Sip协议的聊天室，对学习sip协议的初学者有很大帮助-This is a chat room based on the Sip protocol, to learn for beginners sip protocol helps a lot