Originally Posted by bushg
I have tons of problems with my phone lines. I have worked at home for years and have had learned to fix a few things
Maybe your inside jack got wet.
Your inside jack may have gotten bumped or hit and the lines are not connected as well as they should be.
Your line from the cord to the jack could be the problem.
Your cord from the handset to the phone base could be the problem. If corded phone.
The above could be repaired by you if you have the correct tools, replacement parts,the time and patience.
It could be at the main box...due to it being old, advice from the phone repairman as this has been problematic for me.