[asterisk-users] reduce dialtone volume on zap channel.

[Tom Rymes]

On Nov 20, 2006, at 2:21 PM, Don Pobanz wrote:

>> Eric "ManxPower" Wieling
>>
>> No, you cannot change the volume of ONLY the dialtone
>> on a Zap interface.
>>
> I was afraid of that.
>
>> The most common problem with the first digit being
>> missed by the telco is that Asterisk is trying to
>> dial too soon after it goes off hook.  If
>> it is an analog port then prefixing your number
>> with w or ww will help.
>>
>
> My issue is prior to ever sending the digits somewhere else such as  
> the pstn. It is just having asterisk recognize the dtmf when I  
> press a button on the phone.
>
> Don Pobanz

Dan,

If I have followed this thread correctly, your problem is that, when  
you pick up a local analog phone connected to asterisk through a zap  
channel, asterisk generates a dialtone, and everything works fine,  
except that the echo is intolerable. Then, you install an echo  
canceller, and then asterisk cannot reliably register your DTMF  
digits when you pick up the phone and dial. In other words, your  
problem shows up when you install the echo cancellers.

Do you have the echo cans installed between your local extension and  
the zap channel? I assume so, because otherwise they should have no  
effect on your DTMF. Maybe I'm missing something, but I was always of  
the impression that echo cancellers are installed between asterisk  
and the PSTN, not between the local handset and asterisk. That way,  
the echo canceller is only in the media stream when you place a call  
out to the PSTN. I assume that you don't have echo problems calling  
from one local analog extension to another. If you do, however, I  
would suggest that maybe your problem is bigger than just a DTMF issue.

Just a thought,

Tom