18 - 22 Kbps .... my dream!
I have asterisk -> INTERNET -> asterisk connection with IAX2 and I try iLBC, gsm, g729 and speex and the minimun bandwidth was 38 Kbps for 1 channel.
What the parameters do you set to have this rate ???
Thank you.
Miguel Ruiz Velasco Sobrino wrote:
I have an installation that connects in a [very] good day at 22kbps, but the normal is
about 18kbps.
I use de ILBC codec, and also change in iax.conf the
trunkfreq = 20
to trunkfreq = 30
It works, you can understand well the other person, but don't expect miracles or an outstanding sound quality.
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
Miguel Ruiz Velasco
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