[Asterisk-Users] DTMF Tone Lengths

[Rob Tarte]

Asterisk generates DTMF tones in  do_senddigit() in the file channel.c.  
The tones are defined in a const char array called dtmf_tones[].  Each 
DTMF tone is a string that looks something like:

"!941+1336/100,!0/100", /* 0 */

The part that reads !941+1336/100 is the part that you want.  Change the 
"100" to something bigger and recompile.  You will have to do that for 
every tone.

I hope that helps.

Rob

Rich Adamson wrote:

>Someone else on the list had a similar problem, and as I recall, they
>changed a parameter in asterisk to cause "it" to send longer dtmf
>tones. That posting happened within the last couple of months.
>
>Essentially the sip phone sends dtmf signaling via the rfc method 
>within sip packets (not actual tones), asterisk interprets the
>digits, and generates the dtmf tones. I don't have a clue where to
>find the asterisk parameter to control that, but would have to guess
>it is in a header file within the asterisk source directory.
>
>------------------------
>  From: Ronald Hartmann <RHartmann at nnamtraH.com>
>  Subject: [Asterisk-Users] DTMF Tone Lengths
>  Date: Sun, 5 Jun 2005 12:33:12 -0400 
>
>Good day,
>
>	I am hoping that someone can assist me with a work around.
>
>	I have an IVR system that I am attempting to connect asterisk
>to, however the IVR was written 
>	Some time ago, and requires tones to be approximately 2 seconds
>in length.  I am using SIP
>	Phones, Is there any way to adjust the Length of the Tones that
>asterisk sends out the audio path?
>
>	Are there any phones that would allow me to hold the "Buttons"
>in and generate the tone for the entire length that it was held?
>
>I have exhausted my friend "Google" and I think maybe I just am not
>searching correctly, certainly others have crossed this chasm.
>
>Thanks for your direction in this matter.
>
>
>
>---------------End of Original Message-----------------
>
>
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-- 
Robert Tarte
Pacific CodeWorks
P.O. Box 29050
San Francisco, CA 94129