[Asterisk-Users] Re: Asterisk bandwidth tuning?

[alexandre::aldeia digital]

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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