Minisip

Minisip is a SIP User Agent ("Internet telephone").LGPL and GPL

It can be used to make phone calls, instant message and videocalls to your buddies connected to the same SIP network.

MiniSIP video call on an HP IPAQ pda

Features

• SIP compliant (RFC 3261 and more)
• Multiple lines (users) on the same phone
• Multiple incoming/outgoing calls simultaneously
• Runs on multiple Operating Systems (Linux PC, Linux familiar IPAQ PDA, Windows XP and soon Windows Mobile 2003 SE)
• Focus on security: TLS, end-to-end security, SRTP, MIKEY (DH, PSK, PKE)
• Instant Messaging
• Video conferencing
• Spatial audio
• Push-to-Talk (P2T)
• Full Mesh audio conferencing
• STUN support
• Call Logging