Voip phones authenticating to DATA domain??

Are there any config lines on switches that would cause this?

So we have a single switch, which as far as I can tell is set up the same as others on the network, with phones authenticating to the DATA instead of VOICE domain. They'll (sometimes) pull an ip but are not pingable , and do not register in call manager.

Our phones at the location use MAB for authentication, but as far as our SAs can tell, the MAB and nps policies are good.

Edit: switch is a C3750x, phone is a Cisco 7965.