DND should be used with IPMA configured and added as a service per the phone needs DND feature, DND is a part of IPMA in Cisco CallManager 4.x and 5.x. (In Cisco CallManager 6.x, the DND feature can be used without IPMA.)
to use DND u should first follow the IPMA configuration procedure so that the phone that will have DND activated should have IPMA (either proxy or shared mode) configured on it.
as i got from ur question that u just only wants DND feature not full IPMA, so there are some workarounds u can use to have DND without IPMA, please see my post on:
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