QuteCom Previously known as WengoPhone, Qutecom is a free, SIP compatible VoIP softphone initially developed by Wengo. QuteCom supports a range of VoIP codecs including G.729, G.711, iLBC, G.722 (wideband) and Speex. H.263 for video is also supported.
XLite from Counterpath A very popular, free SIP softphone supporting a range of codecs and also offering great support for desktop business video...
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