[b14ck]

Google voice blocks our exchange numbers in Pennsylvania for some reason :( We're currently expanding into multiple datacenters--so we'll have new exchange numbers shortly. But it seems that our 610-XXX numbers are all blocked by Google.

[MysticFear]

"In order to avoid paying high connection fees to traffic-pumping carriers, Google Voice has blocked calls to some of these carriers." - http://en.wikipedia.org/wiki/Traffic_pumping

Looks like you are traffic pumping after all.