baresip : Baresip is a portable and modular SIP User-Agent ( https://github.com/baresip/baresip )
re : Generic library for real-time communications with async IO support ( https://github.com/baresip/re )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a AlexandreFournier
For Paludis use this rsync : rsync://gentoo.zugaina.org/AlexandreFournier-portage
If you have a problem : ycarus(-at-)zugaina.org