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

[Chan Kwang Mien]

Hi Paul,

I have tried putting another Asterisk Server into the Test Bed.
Currently, the test-bed is :

Analog Phone A <--> Asterisk PBX 1 <--> Asterisk PBX2 <--> Analog Phone
B

When I called Phone A which is a speaker phone which doesn't have
acoustic echo canceller using Phone B, I could still not hear any echo
in Phone B. 

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.

Best Regards,
Kwang Mien


> Hello,
> 
> Chan Kwang Mien wrote:
> > My questions is :
> >
> > Does anyone know how I could add delay at the Asterisk PBX such that the
> > echo would be delayed so that it becomes audible at Phone B.
> 
> Just add an additional Asterisk server in call chain - you will have voice path
> delay at least 20-40 ms. To increase delay, you can choose costly codec between
> Asterisk boxes (like g.723, iLBC, g.729, gsm).
> 
> 
> WBR,
> Paul.
> 
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