I had the same problem with Caller ID, spent an hour on the phone with tech support (in Mexico), as a last resort they did a factory reset on my router (Actiontec Rev. I) and the problem disappeared. They did not ask if it was ok to do the factory reset, I of course lost all of my settings, not happy, but hopefully I have gotten them back. But apparently the solution to this problem is to do a factory reset on the router, we tried everything else first.
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Justin
FiOS TV, 25/25 Internet, and Digital Voice user
QIP7232, QIP7100-P2, IMG 1.9.5
Keller, TX 76248 (VHO 1)