This can be harder to do than it looks at first glance - the electrical cable "snake" that follows elevators up and down their shaft is frequently implemented with only POTS/cat3 grade wiring. Getting a SIP phone to work in one can require a local source of power in the elevator (usually a 120VAC to 12VDC power supply for the phone rather than PoE) and a VDSL2 bridge for 100BaseTX over the old style phone wiring.
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Right, I'm talking about a plain analog phone connected to one of the ATAs on a Cisco PBX. I was doing some other work on the rack and remember a cable flag that said "ELEVATOR" :).