[asterisk-users] Require a Type 102 milliwatt number

[Sherwood McGowan]

Sanjay Rajdev wrote:
> 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
>
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You could always do a hairpin call, make the call out on the PSTN to 
your own number and have asterisk supply the Milliwatt signal. That's 
how I set up my current client's Zap settings