For a residential home, we've allowed for a door entry system, where we'd like to the following:
- Push button at door entry panel calls all intercom stations (handsets) - audio only
- From any intercom station, you can "buzz in" someone through the front door (release electronic latch)
- From any intercom station, you can call another station (e.g. ground floor to upper floors). Ideally, option to have a station auto-answer and be on speaker (so you can "shout" upstairs from a ground floor intercom.
- In order to save on wall junk, we'd like to use the same intercom stations / handsets to make regular phone calls
We've wired CAT5e point-to-point (daisy chained).
I've identified a Stentofon TCIS-3 door entry panel that works as a SIP phone, but I'm a unclear how to get power to all the intercom stations, and how to connect it all to the PSTN telephone too.
I know the Stentofon TCIS-3 can be powered via PoE, but can most SIP phones too? And can such devices be powered when the cat5e is point-point (PoE or injecting power - see diagram below)?
P.S. Here's a more extensive guide to the door entry system