Cisco Unified Communication Manager (CUCM) - How To Add Phones
Before starting you should reset your phone(s) if they have been previously registered to another CME/CUCM:
Before starting go to "Cisco Unified Serviceability" drop-down on the top-right
Under Tools go to Service Activation.
Enable "CallManger" and "tftp" in order for phones to register.
Step 1 - Go The Phone Menu 
Step 2 - Add New Phone 
Step 3 - Choose Phone Type 
Step 4 - Set Phone MAC
The format is SEPMACADDRESS
As we can see, the minimum requirements are that we specify the following:
Device Name:
Device Pool:
Owner User ID:
Device Security Profile:
Step 5 - Add New DN (top left) 
Tags:
cisco, unified, communication, cucm, phonesstep, dn,