XUG Osnabrück

IP-Telefonie (Wikipedia)

VoIP-Softwareliste (Wikipedia)

SER

openSER (Wikipedia)

VoIPonCD (Asterisk)

VoiceSpam

Aterisk.li

Junghanns.net

Junghanns.net (Downloads)

IAX-Verbindung zwieschen 2 Asterisk

Asterisk-Kompakt

Asterisk-Kompakt (Scripte)

Asterisk-Tutorials (lilalinux)

Eisfair mit Asterisk

Die eigene VoIP/ISDN-Anlage

Asterisk@Home (Trixbox)

Trixbox

Asterisk-Anleitungen

Elastix

Elastix is an Open Source Sofware to establish Unified Communications (include an Open Source Call Center module)

BeroNet (VoIP Hardware)

Voice over IP