pcapsipdump : pcapdsipdump is a tool for recording voip calls ( http://sf.net/pcapsipdump )
re : Libre is a portable and generic library for real-time communications with async IO support and a complete SIP stack with support for SDP, RTP/RTCP, STUN/TURN/ICE, BFCP and DNS Client ( http://www.creytiv.com/re.html )
restund : Restund is a modular and flexible STUN and TURN Server, with IPv4 and IPv6 support ( http://www.creytiv.com/restund.html )
sipsak : small command line tool for testing SIP applications and devices ( http://sipsak.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a zoobab
For Paludis use this rsync : rsync://gentoo.zugaina.org/zoobab-portage
If you have a problem : ycarus(-at-)zugaina.org