Excellent answer tim. Honestly; the ONLY reason I was even considering swapping out the ATA, was because of one feature that the 502 had on it that was cool. Believe it or not, I could actually use rotary phones on the 502. I have a 1910 country junction phone and a 1957 pay phone. They actually worked on the 502. Currently; I can "Receive" calls but can't dial out with rotary. Anyway; I was interested in possibly going with the 702 if it could do rotary. But my current PAP2T is voipo provided. I don't really want to get back into BYOD. I'd rather let VoipO control the perameters. Thanks... Mike....