QuteCom (formerly WengoPhone)
is a free software SIP* compliant Voice over Internet Protocol (VoIP)
client developed by
the OpenWengo community. It lets users speak to other users of SIP
compliant VoIP software without charge.
However, QuteCom is more than just VoIP software: it is a
communications tool that lets you enjoy free calls, video conferencing,
SMS, chat over many existing protocols (MSN, AIM/ICQ, Yahoo!, Jabber).
PC-to-PC calls are Hi-Fi quality and use
several codecs such as ILBC, PCMA, PCMU, AMR, AMR-WB and GSM.
* The Session Initiation Protocol (SIP) can be used to create
two-party, multiparty, or multicast sessions that include Internet
telephone calls, multimedia distribution, and multimedia conferences.
Free to download Size
GNU GPL Developer OpenWengo - a community of enthusiasts and developers