>
> >D.C. Line Voltage (Talk Battery) - 48v with receiver on-hook, red wire
> >(ring) negative, 5v for off-hook (with 50-1000 ohm d.c. load on line).

That off-hook number is pure imagination. You can get anything from
near-zero to ???
I've seen 6V to 18V across off-hook equipment. Mostly, it depends on the DC
resistance of the telco line (an unknowable for you) and the instrument
(another unknowable, unless it's your design)

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