We would like to have stand-alone client softphone application , develop in C or C++.
Sip based softphone with source code included, supporting voice, video, nat travesal, stun.
Use open source sip stack, the GUI and stack may be similar to Gizmo 2.0.2.
Codec should support G729, G711, [url removed, login to view], Ilbc, GSM, and others.
Support OS are Windows, if possible, Linux and Mac.
It should come with Gui, chat, conference call and phone book.