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Hello Giovanni and everybody,
Thanks a lot for your
suggestion.
Unfortunately, that does not help. With
READ_SIZE=16, I got vibrating voice on the speaker phone. With READ_SIZE=80, the
voice came back to normal and the echo is more reduced but still noticeable. I
finally changed it back to 160 as it seems to affect a lot of things in
chan_zap.
I am sorry that I didn't properly explain
the setup I have. I think this issue happens because I use wireless handset.
Here is my actual setup:
--------------- out
------------
| | <--- | | Wireless handset <--> Base phone <--> FXS (TDM400P) <--> | ZAP Channel | | Asterisk | (Mic muted) | | ---> | | --------------- in ------------ ^ Monitor() The delay between the original voice going
out from asterisk to the phone, and its echo coming back to asterisk is about
104 ms, assuming that Monitor() application wrote both files at exactly the same
time. How did I find that? I loaded the "in" and "out" files created by
Monitor() application into Audacity (audacity.sourceforge.net). I could not find
any other method to find this delay. Does anyone know a better and more accurate
method?
When I did the same thing using X-Lite with
below setup:
--------------- out
------------
| | <--- | | PC (X-Lite) <--> | SIP Channel | | Asterisk | (Mic muted) | | ---> | | --------------- in ------------ ^ Monitor() There is no sound at all on the "in" file
created by Monitor() application, indicating that there is no echo at all as the
microphone on X-Lite was muted.
Since the echo on FXS is consistent, there
must be a way to eliminate it. The question is how? I think it can not be done
only by changing the configuration parameters related to echo, especially with
this huge delay.
Do you have any other
suggestions?
Cheers,
Anto
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