Yeah, my problem is different, and probably symmetric NAT related. We get a long pause then a fast busy, not a direct to voice mail call. Normally your problem is caused when your phone/ata is not continually registered with the VOIP provider--when it will register to make an outgoing call (which would appear to work fine) but all incoming calls go to VM because it appears that your ata/phone is not presently registered with the provider and they don't have a device to ring when they get a call.
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