Re: Zaptel Pseudo TDM Bus

Mark Spencer (markster@linux-support.net)
Sun, 21 Jul 2002 14:01:23 -0500 (CDT)


> A random question: is there any reason why Ogg isn't among the codecs?

It wasn't ready when I started. Ogg, like mp3, is generally a very poor
choice of codec for telephony, and even for the storage of files, unless
its performance has improved greatly.

On a 900 Mhz Athlon, you can get *hundreds* of simultaneous full-duplex
GSM full-rate codecs running. Certainly that's an unrealistic expectation
even for half-duplex ogg or mp3. As for using ogg as an actual telephony
protocol, its frame size is (or at least was at the time I contacted the
author) much too long to be practical. Frame sizes for VoIP should be
around 160 to 240 samples in general.

Mark

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