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

[James Freire]

Actually, I had just made another identical install using a 1.2ghz celeron and there is no more echo! THe sound is great and there is no noticable delay between the sip phone and the POTS phone its calling to on the outside world.

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Chad Brown
Sent: Friday, August 06, 2004 12:45 PM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] Lots of Echo with SIP -> Asterisk -> PSTN


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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