[Asterisk-Users] Lots of Echo with SIP -> Asterisk -> PSTN

[Chad Brown]

Hi James,

I had the same problem. Setting echotraning=yes helped me.

Also, like many people I had to tweak the rxgain and txgain. For me
these setting worked well.

rxgain=0.0
txgain=-4.0

If I tried to increase the rxgain SIP echo got really bad. Although I
could hear the PSTN caller much better. I settled for less echo. ;-)

Setting the txgain=-4.0 eliminated echo that my PSTN caller was
experiencing. 

However, it seems that everyone needs different settings dependant upon
many factors...

http://www.voip-info.org/wiki-Asterisk+echo+cancellation


Chad

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of James Freire
Sent: Friday, August 06, 2004 4:12 AM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] Lots of Echo with SIP -> Asterisk -> PSTN

Hi all.
I am having this echo problem on my SIP phones when I am making a call
from SIP to a PSTN line through asterisk. The echo goes away eventually
after a few seconds when the call starts but it is very aparent during
the start of the call. I do have echo cancellation turned on in asterisk
as well as on the sip device. This is an ATA and not a SIP phone like a
grandstream. 

I am running asterisk on a PII 350mhz machine and I am not sure if that
has anyhing to do with the lack of performance in echo cancelation. I
have 4 Digium FXO and 4 FXS ports in this machine.
I know it does take a good ammount of CPU power to do echo cancellation.
Later today I am getting a faster machine but I just wanted to see if
there were any settings or tuning I can do in the compilation of
asterisk to get it to perform better.

Thanks a lot,

James
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