Introduction - If you have any usage issues, please Google them yourself
An open-source sip stack GNU oSIP library oSIP is the introduction of SIP realize. SIP representatives of Session Initiation Protocol (Session Initiation Protocol), is described in RFC3261 (does not support RFC2543). The library is designed to provide multimedia and communications software developers an easy and powerful interface, which in their application to initialize and control SIP.SIP is based on the conversation IEFT an open standard alternative to H.323.