Mar 8, 2013 #1 B Barnaby New member Joined Feb 7, 2009 Messages 5 Reaction score 0 Points 1 The instructions say push a button for DTMF function but what is DTMF function ?. It doesn't say .
Mar 15, 2013 #2 A AVDADDY Member Joined Sep 28, 2009 Messages 211 Reaction score 0 Points 16 Touch tones.