I have a line that works fine when I plug a standard phone into it, but when it's plugged into the TDA50 I can't get a dial tone from a handset. It's not the CO port on the TDA50, because I've moved the nonworking line to other working CO ports and it won't give me a dialtone on those either.

There is really nothing I can see to adjust on the TDA50 to try to figure out the problem.

Anyone seen something like this before?

Thanks...Josh