[Asterisk-Users] GSM ISDN gateway to quadbri NT port under bristuffed Asterisk - where to set gain (I have unreliable inband dtmf recognition )?

[Steve Underwood]

Robert Rozman wrote:

> Hi,
>
> I'm getting unreliable dtmf recognition (it works fine for 4-5 digits, 
> errors (duplicates) on more), when transferred inband from gsm gateway 
> to NT port of quadbri under bristuffed Asterisk.....
>
> Since Asterisk is claimed to have good dtmf recognizer, I suspect 
> there are some settings to workarouned... I've tried dtmf relax, but 
> didn't help, so I suspect gain settings....
>
> Is there any other possible cause of unreliable dtmf inband 
> recognition ? Where can I set gain on voice channel (I guess majority 
> of settings under bristuff in zaptel.conf are dummy) ?
>
> Any other advice on this problem or similar experience ?
>
> Thanks in advance,

I kind of amazed if works at all when getting DTMF out of a GSM phone. 
You really shouldn't expect it to.

Regards,
Steve