Linphone is an IP telephony tool that runs on Linux. It allows you to query your friend's IP over the internet and call him via IP.
Linphone Features:
· SIP User Agent compliant with RFC3261
· Supports ListBox calls simultaneously with Call management Features:hold on with music, resume, transmits ...
· Audio with the following Codecs:speex (narrow band and Wideband), G711 (Ulaw,alaw), GSM. Through Additionals Plugins, it also supports AMR and ILBC.
Linux interface
http://www.aliyun.com/zixun/aggregation/17097.html ">video with codecs:h263, h263-1998, MPEG4, Theora and H264 ( To a plugin based in x264), with resolutions from QCIF (176X144) to SVGA (800x600) provided that receptacle bandwidth and CPU power are sufficient.
· Supports IPV6
· Supports any webcam with a v4l or V4L2 driver under Linux and Directshow driver on Windows
· Text Instant HTC and Presence (using the simple standard)
· AddressBook
iphone interface