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I've definitely seen elevator phones attached to the PBX with VoIP trunking, but all the components were on battery backups.
by superuser2 10y ago
I've definitely seen elevator phones attached to the PBX with VoIP trunking, but all the components were on battery backups.
- jlgaddis 10y agoAt a previous employer (large .edu), we moved to VoIP several years ago but keep several PSTN lines -- including all of the emergency ones, such as for the elevator. We could have moved them to VoIP as well but we figured, in a true emergency, it was one less thing to have to worry about.
- godzillabrennus 10y agoIn Chicago building codes mandate elevators have a pstn line in place. Even luxury homes with small elevators.
- hexane360 10y agoWell, I mean people have died from being stuck in their own elevators: http://www.cbsnews.com/news/elderly-couple-dies-trapped-in-home-elevator/ http://www.cbsnews.com/news/elderly-couple-dies-trapped-in-h...
- walrus01 10y agoMost large cities' building codes mandate auto-start/auto-transfer backup generators for elevators in buildings over a certain height. It is sometimes possible to put critical equipment on a generator backed circuit (such as a 48-port 802.3af PoE switch providing power to phones).
- walrus01 10y agoThis 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.
- superuser2 10y agoRight, 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" :).