Arc -

You have two choices - either a device that autodials a number (any telephone extension should work) or a specific type of circuit called an automatic ringdown or a hotline circuit.

You don't say what type of phone system it is (I was going to ask if it was a Maytag or a Whirlpool, but I won't)

Size, in this case, really doesn't matter. If the phone system supports this type of circuit, fine (usually it's just a programming change).

If the system doesn't then you'll need to purchase a standalone ringdown circuit. Those are readily available, both from members here or from Telecom Supply houses.

What type of elevator phones you install should also be noted. Make sure they're compatible with your circuit.

If the Otis guy says a 24 hour front desk is good, you're probably OK, but, as Hal suggested, you may want to check with the AHJ.

Sam

"Where are we going and why are we in this hand basket?"