Using a computer headset with a microphone connected to the computer will most
likely get rid of the acoustic echo right away. Also to achieve better
performance on this, go to Control Panel, Sounds and Audio Devices, Voice tab
and click the advanced button under Voice playback, and choose either stereo
headset or whatever hardware you have there.
Zoltan.
----- Original Message -----
From: Jim Van Meggelen
To: 'TAUG'
Sent: Thursday, August 17, 2006 9:11 AM
Subject: RE: [on-asterisk] Echo Problems
If you are using a soft phone, you can verify whether it is accoustic echo by
having your caller count to ten and note which numbers spoken have the echo.
While they are counting, unplug your microphone from the count of 4 to 7. If
the echo goes away when the mic is unplugged, your echo is accoustic (meaning
what they say is being picked up by your microphone). This is essentially
feedback. The solution is to prevent the mic from picking up what is received,
but this is not always easy to achieve. What sort of audio hardware are you
using?
The tx and rx gain are indeed in zapata.conf. I would reduce the rxgain
first, but no more than -3dB at a time. Also, keep in mind that this will
affect all calls, so you will not be the only user affected.
Jim
----------------------------------------------------------------------------
From: Andy Jaikissoon [mailto:[EMAIL PROTECTED]
Sent: August 17, 2006 8:57 AM
To: 'TAUG'
Subject: RE: [on-asterisk] Echo Problems
Hi Jim
I’m using the Xten Lite right now.
In regards to the RxGain and TxGain, I gather you mean the settings located
in Zapata.conf?
Andy Jaikissoon
----------------------------------------------------------------------------
From: Jim Van Meggelen [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 17, 2006 8:55 AM
To: 'TAUG'
Subject: RE: [on-asterisk] Echo Problems
I would start with changing the rxgain and txgain on the channels.
The echo is probaby accoustic echo caused by your SIP phone. Attenuating
the rx or tx on the trunks may mitigate this somewhat. What model of SIP phone
do you have?
Jim
--------------------------------------------------------------------------
From: Andy Jaikissoon [mailto:[EMAIL PROTECTED]
Sent: August 17, 2006 8:49 AM
To: 'TAUG'
Subject: [on-asterisk] Echo Problems
Hi there.
Maybe someone out there can help me (I know, he’s here again with yet
another question).
I’m having echo problem. Well not me. But callers on the PSTN side. So
here’s my setup:
Caller at home -> ISDN trunk with DID -> Telco Switch -> SIP Trunk ->
Asterisk/Trixbox -> SIP User (Me)
So if I dial my DID that goes to my telco company (who has the DID coming
in via an ISDN trunk to them). They then send it too my Asterisk box via SIP.
There, the Asterisk box does its nice little prompts and determines that the
call needs to go too my SIP phone so it sends it.
Now, when I get the call on my SIP phone, all is well. The caller on the
PSTN side however has no end of problems with echo.
I’ve read quite a few things on the net but it’s either Zapata this or
FXO that.
Where to start and how to fix?
Andy Jaikissoon
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