It got cranky again.
This time, while it was acting up, I grabbed the cordless that's on the same line. I still don't know whether it actually "draws" a dialtone, but I do now know that it can transmit when it's acting up.
I also tried an ohmmeter across the receiver, while it was acting up. It registered finite resistance, and the receiver clicked when applying or removing the ohmmeter.
The receiver is across the black and yellow wires in the handset cord. They both check out as zero ohms.
Unfortunately, as usual, opening the phone up seems to cure the problem.
Can somebody explain the hookswitch contacts on this model?
