I put in an asterix system 20 years ago, it still runs great, all I've done has been to replace a couple of dying (RAIDed) drives. I live in NZ used to live in the Bay Area, NZ trunks come in from a local SIP provider and use an Ooma box for our old US phone number, in home we had 5 FXSs and a sip phone in my office - everyone had a phone in their bedroom, and a couple on public spaces.
It's set up so that all incoming calls hit a voice prompt saying which 1-digit extension you should enter to get who (this stops 99% of phone spam) - everyone gets a voicemail on their extension which rings in their bedroom and rolls over to the common spaces - and everyone gets a unique ring cadence, my daughter who at one point got 80% of the phone calls got the 2 short rings.
The kids have gone, we've moved to a smaller house, only 2 extensions, but that same hardware soldiers on (and still stops 99% of the spam - I've had 1 call in the past year)
It's set up so that all incoming calls hit a voice prompt saying which 1-digit extension you should enter to get who (this stops 99% of phone spam) - everyone gets a voicemail on their extension which rings in their bedroom and rolls over to the common spaces - and everyone gets a unique ring cadence, my daughter who at one point got 80% of the phone calls got the 2 short rings.
The kids have gone, we've moved to a smaller house, only 2 extensions, but that same hardware soldiers on (and still stops 99% of the spam - I've had 1 call in the past year)