In article , David
Nebenzahl writes

That second link suggests powering the connecting line with ~24 VDC, but
I don't think that's actually necessary.

I think that's incorrect. You need to provide some line voltage. 12VDC
will do it.

computeri

I feel sick.

Please don't suggest using Ethernet or something else instead. I'm
trying to use what's at hand here.

You must have a cable to connect the modem line jacks together. If it
has at least 3 cores free, why not use a direct serial-serial connection
instead of farting about with modems?

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