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.
