Depends on how deep your pockets are. At this point in time, for residential service, the Key System is probably unbeatable, but give it 2 more years, and just maybe the tables will turn. Just depends on bandwidth. If you are wanting 8x24 capacity in a residence, what are you using for a pipe? Are you cable?, are you DSL,? are you fiber?
Right now, there are quite a few IP based systems trying to get to market, but the voice quality really suuucks, if you are used to good ole dial tone systems, you will be very disappointed. IMHO
MarvO said it