linphone-desktop : A free VoIP and video softphone based on the SIP protocol ( https://gitlab.linphone.org/BC/public/linphone-desktop )
twinkle : Softphone for voice over IP and IM communication using SIP ( https://github.com/LubosD/twinkle )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a nest
For Paludis use this rsync : rsync://gentoo.zugaina.org/nest-portage
If you have a problem : ycarus(-at-)zugaina.org