I just got Vonage for my home business phones, after getting tired of Comcast's high costs, and AT&T's lousy, noisy connection.
Voip is the way to go. Full digital with web reporting of incoming and outgoing calls, email notification and forwarding, the whole bit.
Careful of porting a number though. I takes forever, so be sure you're happy with the service before you commit.
I had Vonage, but they would not provide the call blocking. I have all the same other features, such as forwarding, etc. at less than half their $24.95 for each line. $9.95 per line for unlimited.
We got Vonage about 8 months ago and love it. That plus Comcast Broadband and it's around $70 per month. Saves us a fortune.