sipwitch 0.8.4-0ubuntu1 (i386 binary) in ubuntu maverick

 GNU SIP Witch is a secure peer-to-peer VoIP server. Calls can be made even
 behind NAT firewalls, and without needing a service provider. SIP Witch can
 be used on the desktop to create bottom-up secure calling networks as a
 free software alternative to Skype. SIP Witch can also be used as a stand-
 alone SIP-based office telephone server, or to create secure VoIP networks
 for an existing IP-PBX such as Asterisk, FreeSWITCH, or Yate.