Been having the same types of problems with GV and CC, as have many others. The way it is now, GV paired with CC for incoming calls is essentially worthless. It appears to be be a GV problem. And as of today, even the voicemail indicator on the phone wont clear, even though there are no messages. Google Voice has problems. Temporarily forwarded the GV number to a Verizon Home Connect number. No delays, rings right through, plus CNAM.
I realize of course that GV is free, and cant crab too much about something that is free, but if it no longer works then perhaps its time to ditch it. Dont know about anyone else on here, but personally I'd be willing to pay a little for GV, so long as it worked, a tech person actually kept up with posts on their problems forums, and they'd give us the option to turn off the voicemail and just use an answering machine.