We ported our Comcast home phone number to Google Voice (via an AT&T burner phone) last March. There are a few people we know with Comcast home phones that cannot get through to our house. They get the message "we're sorry your call cannot be completed at this time please try again later". The only people having the problem are Comcast lines. But there are a few people with Comcast lines that HAVE been able to get through. We don't know whether it is a problem with Comcast, Google Voice or OBi. Is anyone aware of an issue like this? Any ideas of a solution?