Yes.  I use them...

Sent from my iPhone

On Mar 9, 2014, at 9:02 AM, Angelo Glorioso <n5uxt@hotmail.com> wrote:

Hi all,
 
I realized this has never been asked or I just can't find the answer.
Can the A B C D on the DTMF pad be used for control codes??
 
73 de Angelo
 
 
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