AFAIK, there are plans to integrate the open source Sophia-SIP into the existing open source Tapioca VoIP client but the Nokia people (person?) who have that on their plate have other priorities at the moment. There were messages in the user or devel list about that a few months back.
<br><br>It would be wise to coordinate with the Tapioca team as it seems to have a pluggable infrustructure (and a lack of developer time) that would be conducive to your efforts.<br><br><a href="http://tapioca-voip.sourceforge.net/">
http://tapioca-voip.sourceforge.net/</a><br><br>Ekiga, while an excellent app, might be too much to port over as it has a lot of functionality (mainly all the video stuff) that you would have to strip out. I also think it has a lot of dependencies on the full Gnome desktop infrustructure that isn't replicated on the 770 while the Tapioca frontend and jingle backend is already available for the 770.