Caleb wrote:
Speaking of audio quality, does anybody know why Skype's audio quality is better than that of Asterisk to most users? I have been trying to figure that out but dont seem to get what may be left out, even on GSM. Am I looking the wrong direction to begin with?
Skype uses wideband voice. This means you can do things like tell an "f" from an "s", which you cannot do on a normal telephone line. The whole voice sound is much more "hi-fi". The codec they use is the wideband version of iLBC. Although narrowband iLBC is free to use, wideband iLBC is not.
Regards, Steve
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Heya,
I don't really know a lot of this, but I tried encoding with speex a little bit. I saw that the speex-commandline-encoder has options for narrow/wide/ultrawide-band. It supports traffic from ~2.5 kB/s up to ~45 kB/s (I suppose it is kilobytes). I think it also has other nice properties which are mentionned on the speex.org-site. The gain-control is also helpfull maybe, ... I don't know if any hardware phones support speex although this would be interesting maybe. Maybe this wasn't considered because Asterisk can't use speex in conference-sessions? I hope it is helpfull. Does asterisk support conferencing using the speex-codec and if not, is this planned?
thanks,
Michel
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