I did fix my problem with no help from anybody on the internet including Comcast.
Turns out that there was some corrosion on the phone wall jack where the wires connected.
I cut and cleaned the wires and replaced the phone jack and it has worked fine ever since.
I am not sure what the line voltage should be but if you can have someone check it with a meter
(all of your phones and connections). Evidently I was getting enough to ring the phone initially but
only one time. Not sure why this is but that was the symptom and the fix for my issue.
I am curious to know if this is your issue or something else?
... View more