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.
Sofia Sip is an open-source Sip User-Agent library, compliant with
the IETF RFC3261 specification. It can be used as a building block
for Sip client software for uses such as VoIP, IM, and many other
real-time and person-to-person communication services. The primary
target platform for Sofia Sip is GNU/Linux. Sofia Sip is based on a
Sip stack developed at the Nokia Research Center. Sofia Sip is
licensed under the LGPL.
