asterisk users - Apr 2006 - Touch tone recognition issues

I'm experiencing touch tone recognition issues when calling some outside
phone systems. For instance, if I call my Nextel phone, and try to press
* to enter my voicemail, Nextel's system does not "hear" the DTMF
tone.
I've also experienced other outside phone systems for which I am unable
to use their touch tone menus. Oddly, this isn't the case with all
outside systems. If I call Dell, everything works great. 

 

Is this a known issue with asterisk? I'm hope there is a simple setting
I've over looked.

 

All help is appreciated.

 

Thank you.

Bryan Mahin

 

 


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Bryan Mahin wrote:
> I?m experiencing touch tone recognition issues when calling some 
> outside phone systems. For instance, if I call my Nextel phone, and 
> try to press * to enter my voicemail, Nextel?s system does not ?hear? 
> the DTMF tone. I?ve also experienced other outside phone systems for 
> which I am unable to use their touch tone menus. Oddly, this isn?t the 
> case with all outside systems. If I call Dell, everything works great.
>
> Is this a known issue with asterisk? I?m hope there is a simple 
> setting I?ve over looked.
>
> All help is appreciated.
>
> Thank you.
>
> Bryan Mahin
>
Sounds like a common problem solved 20 years ago in the telephone 
industry, when tones were generated by a common sender and the engineer 
didn't read the standards and made tone duration too short.
Asterisk is probably right on that edge and the tone duration needs to 
be somewhat longer. 75mS is probably as short as it should be, better 100 mS
Of course, you didn't say much about your call routing and if Asterisk 
or something else is really generating the tones, so that is just a guess

John Novack
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Bryan Mahin wrote:
> I'm experiencing touch tone recognition issues when calling some
outside
> phone systems. For instance, if I call my Nextel phone, and try to press
> * to enter my voicemail, Nextel's system does not "hear" the
DTMF tone.
> I've also experienced other outside phone systems for which I am unable
> to use their touch tone menus. Oddly, this isn't the case with all
> outside systems. If I call Dell, everything works great. 
> 
>  
> 
> Is this a known issue with asterisk? I'm hope there is a simple setting
> I've over looked.
This is from /path/to/src/asterisk/configs/zapata.conf.sample

; How long generated tones (DTMF and MF) will be played on the channel
; (in miliseconds)

Check there to see the option you must change to increase the DTMF tone 
duration.

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