Jabber XMPP + SIP Messenger?

[Yann Simon]

2006/9/4, Joel Bryan Juliano <joelbryan.juliano at gmail.com>:
> Hi, I've been looking around a IM client that have a combined functionality
> of XMPP & VoIP  through SIP. Is there an open source project exists?
> --

Tapioca offers these functionalities, but it is still a young project.
SIP functionality is work in progress.

http://tapioca-voip.sourceforge.net/wiki/index.php/Tapioca