what does this mean for the 500, thanks for any help
F frank125 Member Joined Feb 10, 2007 Messages 461 Mar 6, 2010 #1 what does this mean for the 500, thanks for any help
n5ims Member Joined Jul 25, 2004 Messages 3,993 Mar 6, 2010 #2 "Dual Tone Multi Frequency" AKA "Touch-Tone" From this site's WIKI - DTMF - The RadioReference Wiki
