how to assign intercom dn to IP phone

Hi there,
I cant find an option to assign intercom DN created in Call Manager to Phones. I've created an intercom parition, CSS and an intercom DN #. Where is the option to assign this intercom DN to phone so I can test this feature ? I'm using CIPC which is an emulation of Cisco 7970 hardphone so I thought intercom should be supported on this model...thnx
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You'll need to copy the standard button template for CIPC and add an intercom button, See screenshot from CUCM 7 attached.

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