How to program a Janus / EMS ADA Elevator Phone with Keypad

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[@levitation2946]

How do you put the phone back to default settings, essentially erasing any programming to start over?

[@baddestskip94]

Is it possible to program a new phone number over an existing one?

[@rdg3686]

Yes, it can be reprogrammed.

[@rdg3686]

How many volts is required?

[@anonunknown124]

As already said, it needs a good 9V battery.

[@rdg3686]

​@@anonunknown124
The question was not about the battery. I know now that 28 to 52VDC is needed to get the telephone line.