[VoIP] 4th Col. DTMF tones

Steph Kerman stfkerman at jps.net
Thu Sep 6 15:07:46 CDT 2007


Mark,

Are you aware of the trick for getting 4th column tones out of a 
12-button dial?

Steph

Mark Rudholm wrote:
> Speaking of fourth-column, does anyone have a 16-button
> DTMF phone (Autovon or just regular old ABCD, I don't care)
> they're willing to part with?  I want one for testing.
>
>
>   
>   


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