SOIP
Kind of like VOIP, but the voice is mostly replaced by silence.
I put together my awesome Asterisk server last year, bought five SIP phones on ebay, and was ready to rock. I guess I was thinking "if you build it, they will call" but it's been a bit lamer than that.
It's not all bad though. Despite that hardly anyone dials our VOIP number because they already have our cell numbers, it's nice to have for emergencies if teh cell network is doing the suckage, or battery is dead, etc. Most of our calls are internal (call downstairs from the bedroom, etc), which is certainly convenient, even if it seems a bit silly at times.
I have been racking up some minutes on my home-office VOIP line however, which rings only at my desk and the softphone on my laptop, so I don't feel that my PBX is not going to waste, even if it is underutilized.
I still need to finish hacking my PAP2 ATA (ugh., still haven't broken in) and I'm going to play with conference calling when I get a chance, and oops-- I still need to arrange to test 911 dialing; but in the mean time my little Asterisk server is doing everything I need and much, much more.

