So, I'm running into the same situation that everyone else is with Time Warner and other Cable/VoIP. It seems that my phone provider doesn't recognize the tone for the digit 3 when dialed. I've tried two different units and both have the same problem. Aside from using Google voice, has anyone figured out a solution yet? Or does anyone have a Google Voice invite that I can use? :-)
update. Got a google voice account and chose a number without the digit 3 in it and the system works again. Just had the google voice number forward to the old cell number with multiple 3's in it.