Linphone

            
            SIP softphone - graphical client

Linphone is an audio and video internet phone using the SIP protocol. Ithas a GTK+ and console interface, includes a large variety of audio and videocodecs, and provides IM features.

The main features of linphone are:

  - a nice graphical interface;  - it includes a large variety of codecs with different quality / bandwidths;  - it uses the well-known and standardised SIP protocol.