From CUCM admin page, you can go to the phone button template (Device --> Device settings --> Phone button button template) and select the one you have created for phones with expansion module (ex: 7960 with expansion module template) and then click on Dependency records in the Related Links, it will show the devices associated with thsi and when you click on phones a list along with MAC addresses (device name) appears.
For this you need to have dependency records service parameter enabled.
Thanks,
Lakshmi
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