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Thanks for your answers. I actually had Verizon forward my calls (it's Centrex) and when they set that up, the problem mysteriously disappeared. Not sure if it was a coincidence or not.

Also,...

I'm a true novice, except that I set up the 2 line jack and can't remember what wires go to what now.

If I have Telco box in basement, what should I be checking for?

Hello,

I have a two line jack that was working fine a few days ago, but now Line 2 has no dial tone and when calling, it rings and rings.

Also, on my Panasonic 2 line phone (KX-TG2740), the...