[asterisk-dev] Queries regarding Echo Cancellation in Zaptel-1.2.6

[Chan Kwang Mien]

Hi Paul,

Speaker Phone A <--> Asterisk PBX 1 <--> Asterisk PBX 2 <--> Phone B

>From the translation table, translating ilbc to lpc10 takes the longest
time, about 231. 

Should I configure Asterisk PBX1 to use ibc and Asterisk PBX2 to use
lpc10, so that there would be translation time incurred for the Echo ?

Could you tell me how I could configure Asterisk PBX1 to use ilbc and
Asterisk PBX2 to use lpc10 ?

Thank you.


Best Regards,
Kwang Mien




> Hello,
> 
> Chan Kwang Mien wrote:
> > Could you elaborate on the use of codec to increase delay ? From what I
> > understood, if both Phone A and Phone B are using the same codec, there
> > won't be any transcoding in the Asterisk PBXs.
> >
> > I was also hoping that Asterisk has a means to add delay to voice
> > traffic.
> 
> Try
>    show translation
> to check how different codecs costs, then disable all codecs except most costly
> on the link between Asterisk boxes. This will produce additional >=35 ms of
> delay (about 20 ms for packetization plus at least 15 ms for encoding and
> decoding for iLBC codec on mine Xeon box).
> 
> 
> WBR,
> Paul.
> 
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