I found a couple of links about speex, the main advantage seem to be VBR, lower bitrate, free license and better quality according to these posts:
> http://lists.xiph.org/pipermail/speex-dev/2005-June/003410.html
> http://lists.xiph.org/pipermail/speex-dev/2005-September/003652.html
note: those are written by the speex author :)
also see: http://www.speex.org/comparison.html
about theora (patent free lossy codec, based on VP3, can compete with MPEG4 format but doesn't share any code or patent with it unlike xvid, divx etc...) :
very interesting official wiki: http://wiki.xiph.org/index.php/Theora
http://www.v2v.cc/~j/ffmpeg2theora/download.html // with source and binary for all plateforms
http://www.tipic.com/tipicim //a free theora based voip+video im
http://theora.org/doc/Theora_I_spec.pdf //theora specs
about gstreamer as a VoIP framework:
http://tapioca-voip.sourceforge.net/ licensed under LGPL
I'm posting all kind of links related to foss VoIP solutions on my blogspot you can keep track of them http://fossvoip.blogspot.com/atom.xml in case you care :)
hope that helps
Patcito
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