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sanjay.rajdev at feath...
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 Posted: Mon May 26, 2008 6:19 pm Post subject: [asterisk-users] Voice low on ZAP |
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I have a Sangoma A200 card on my asterisk box, the sound that is received on the ZAP channel is very low, I is sometime difficult to hear the person on the other side of the line. Is there a way we can increase the volume on the ZAP channel
Regards,
Sanjay Rajdev
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matt at mattgwatson.ca
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| Posted: Mon May 26, 2008 6:32 pm Post subject: [asterisk-users] Voice low on ZAP |
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On May 26, 2008 07:19:07 pm Sanjay Rajdev wrote:
| Quote: | I have a Sangoma A200 card on my asterisk box, the sound that is received
on the ZAP channel is very low, I is sometime difficult to hear the person
on the other side of the line. Is there a way we can increase the volume on
the ZAP channel
Regards,
Sanjay Rajdev
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rxgain=
in zapata.conf
However, before you go blindly upping the value, you should know that you run
the risk of making echo problems worse by messing around with rxgain/txgain.
However, tuning rxgain/txgain is something that you *should* do on all your
FXO ports anyways... properly tuned ports will create far less echo than
those using default values most of the time.
Tuning rxgain/txgain is a little bit of a tedious task however, and I can;t
really say there are alot of good guides out there on how to do it.
The way I did it was first I tuned my rxgain by dialing a telco-owned
milliwatt test number (should be able to get this from your telco, i believe
its referred to as a Type 102 milliwatt test). You use that to tune rxgain,
then the way I tuned txgain was by using the app_milliwatt application to
essentially create my own milliwatt test number (need multiple FXO ports to
do this), so basically i;d dial out from one FXO port and back into the other
and adjust the txgain until i got it right...
You need to use ztmonitor to watch the levels as you adjust tx/rxgain, I
believe the magic number you want to hit in ztmonitor is around 14840 (thats
off the top of my head so i might be off)...
--
Matt
http://www.mattgwatson.ca |
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