[asterisk-users] Increase DTMF Tone Duration

[Anthony Francis]

Steve Underwood wrote:
> Wilton Helm wrote:
>   
>>> The problem is simply the duration is too short (120ms), and the 
>>>       
>> remote IVR >seems to not detect them
>>  
>> That sounds like an IVR issue.  I've worked on some traditional PABXs 
>> and even designed some DTMF receivers.  Any decent DTMF receiver 
>> should be able to reliably decode 80 ms tones, and a really good one 
>> can decode 40 ms.  120 ms should be a very generous duration.  I 
>> shipped 80 ms duration to COs 20 years ago.
>>     
>  Demanding >120ms is crazy. People just don't hold down 
> the keys that long. You'd have horrible failure rates.
>
> Regards,
> Steve
>
>   
You can edit the duration of the tones in app_senddtmf.c and then 
rebuild asterisk.

-- 
Thank you and have any kind of day you want,

Anthony Francis
Rockynet VOIP
(303) 444-7052 opt 2
voip at rockynet.com