🚀 go-pugleaf

One problem at least is obvious:  if you are PULSE dialing and you pick up
another phone, all pulses sent while you are listening will be lost.

Pulse dialing works by OPENING THE CIRCUIT briefly for each pulse.  If you are
across the line with another phone, this open circuit will be defeated by the
loop current running through the second phone in parallel.

Try letting the poor modem dial the whole number before picking up the phone.
Dial it once and time the pulses, then let it do its thing on a non-shunted
phone line and I bet it will work fine.

Tone dialing usually works fine even with another phone or two across the
line, as the tones still get through.

-John Sangster
jhs@mitre-bedford.arpa