[whee]

FWIW, Anveo is pretty cheap for this sort of thing. You could even do your workflow without much custom work: http://anveo.com/consumer/features.asp?code=personalize_call

(Unaffiliated, just a customer.)

[runT1ME]

How much do you pay per month? Do you use it for your cellphone?

[whee]

I use it much like one would use Google Voice; forwarding to my cell phone and a couple of SIP phones with some call flow stuffs. A DID with unlimited incoming is $2/mo. With the e911 charge and outbound minutes I pay ~$3-$4/mo total.