Maybe stating the obvious, but can't you just change the paging number to something that aren't in your range of DNs for phones? Like 9999 or any other suitable number. That would probably make it less probable that someone would dial it from the IVR.
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Okay, was just a thought.
You could try with COR. For that you'll need to get the calls from the IVR to match a unique incoming dial peer. On that DP you'd set a COR list that doesn't contain the right to call the dial peer used to route call to the paging system. On the paging DP you'd need to use a COR list that have a right that the IVR DP doesn't have. For the CME phones you'd do not need to add any COR list, since COR will let all calls through from a DP that doesn't have a COR list attached to it.
COR can be quite hard to wrap your head around, that was at least the case for me when I first came a cross it :) If you compare it to CSS and PT it might be easier to understand. Also the concept of incoming and outgoing call legs are critical to understand. The odd thing about COR is that it will allow calls through even if there aren't any COR list on the incoming or outgoing dial peer.
Look at this URL for more information on how to setup COR, http://www.cisco.com/en/US/tech/tk652/tk90/technologies_configuration_example09186a008019d649.shtml
Best of luck with your setup.
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