asterisk users - Dec 2004 - Rapid DTMF entry failure

Using inband DTMF signaling, our Asterisk server fails to pass DTMF when
it is entered rapidly by a caller.    For example, when a phone number
is entered, if it is entered slowly (a brief pause between each number)
Asterisk is fine.  However, if the ten digits are entered quickly,
Asterisk drops digits.

 

Thanks.


Greg

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Greg,

How fast is fast? The DTMF detector is tested at the maximum specified 
rate - 10 digits per second - and gives no problems. Some systems do not 
control the rate properly, and allow the gaps between tone pulses to be 
completely eliminated. This contravenes the spec., and does not work. 
The detector is lifted from my spandsp library. You can download and try 
that yourself. It contains a full test suite for the DTMF decoder :-)

Steve


Greg Smith wrote:
>  
>
>  
>
> Using inband DTMF signaling, our Asterisk server fails to pass DTMF 
> when it is entered rapidly by a caller.    For example, when a phone 
> number is entered, if it is entered slowly (a brief pause between each 
> number) Asterisk is fine.  However, if the ten digits are entered 
> quickly, Asterisk drops digits.
>
>  
>
> Thanks.
>
>
> Greg
>