I have same problem. My wired alarm originally installed (20 years ago) by then-Brinks with my then landline phone line. when I dropped landline/switched to Comcast voice I was told alarm should work perfectly, in fact maybe better than before (altho I never had a problem with alarm). For past year I keep getting sporadic CP problem on keypad & annoying beep (so I have tp press cancel every time it does that). ADT says must be Comcast, Comcast says must be ADT.
My fix (not) is to unplug modem 60 sec, restart modem, wait, go to alarm keypad press & hold 0 for 10 sec for keypad reboot, wait 5 min then try keypad options test again. Sometimes works then, sometimes not, then I retry later until signal works & i get success horn then CP trouble gone from keypad. My guess is, as other poster suggested, that signal is hit or miss. Not a very secure feeling to say the least.
I am frustrated with this & not sure best way to fix. I understand my system might be too old to communicate with more modern technology, but modern technology seems to invite a whole other set of unresolved issues.......so what are we all to do???
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