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One thing to take a look at is in the contact list for that specific contact is that you didn't accidentally highlight the "Send right to voice mail" check for them.
Is this a new phone? Was it activated correctly? Can you call out on the phone? What phone number are they calling? Your actual Verizon issued phone number, or a google voice number?
Does it vibrate, or are you getting absolutely nothing at all? There is a bug that causes it to stop ringing but it'll vibrate instead even when it's not in the vibrate mode, which I had the unfortunate opportunity to experience. I had to do a factory reset and recustomize my whole phone over again to fix it. I'll try to find that thread and post it here if that's what you are experiencing.
Here it is http://androidforums.com/droid-x-su...143830-help-droidx-phone-no-longer-rings.html
It also contains a link to the Moto forums with info/fixes. Nothing worked for me except the reset.