Hi Chris,
It sounds like you really need "Directed Call Park" which became available in CCM 4.2.1 Have a look at this excerpt;
A2 reverts to the number that parked the call (if the Cisco CallManager Administrator configured the directed call park number with Use Originator as the reversion option) or to another directory number (if the Cisco CallManager Administrator configured the directed call park number with Use Specified Number as the reversion option).
From this 4.2.1 doc;
Directed Call Park
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008055af5c.html#wp1047581
This way you could configure the DN you want the parked call to revert to.
Hope this helps!
Rob
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