Dear Dan;
Thanks alot for your kindly reply.
Well, what u advise us to use if the bandwidth is about 22kbps (dial up connection in very old countries)?
GSM Codec is 13k plus overhead. That may work?
No way. GSM is 13.2kbps, and with Asterisk's hardcoded 20ms packetization, this gives 29200bps with RTP-based protocols or 26000bps with IAX, and as long as Asterisk doesn't support silence suppression, this needs to be full duplex, and I doubt you don't get that from a modem. If we could add silence suppression, we could do with half duplex, effectively saving half the bandwidth. in addition, if we could increase the packetization to something like 50 or 100ms for extreme use (like dial-up), we could end up with a lot less. Say, using 100ms slicing with IAX and speex at 6.3kbps, we'll end up with effective bandwidth use of 8860bps plus ethernet. now that's something you can brag about....
roy
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