[asterisk-users] Require a Type 102 milliwatt number

[Sanjay Rajdev]

Does anyone know a Type 102 milliwatt number that I can call to adjust the RxGain? I have tried the telco but no one is responding on their number. 

Regards, 
Sanjay Rajdev 

----- Original Message ----- 
From: "Matt Watson" <matt at mattgwatson.ca> 
To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users at lists.digium.com> 
Sent: Tuesday, May 27, 2008 5:02:24 AM GMT +05:30 Chennai, Kolkata, Mumbai, New Delhi 
Subject: Re: [asterisk-users] Voice low on ZAP 

On May 26, 2008 07:19:07 pm Sanjay Rajdev wrote: 
> 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 

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 

_______________________________________________ 
-- Bandwidth and Colocation Provided by http://www.api-digital.com -- 

asterisk-users mailing list 
To UNSUBSCRIBE or update options visit: 
http://lists.digium.com/mailman/listinfo/asterisk-users 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20080528/60bbf113/attachment.htm