No, CUCM doesn't do directory lookups to show a name againt the calling number, for IP Phones, that info is hardcoded in the line level.
Only Jabber for example would do that as it integrates directly into the directory to get the info.
Paolo has a script to do that if you're interested in that, he's contact info is in his profile.
HTH
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate