# 6. Phone Deployment

Connect the phones to the network. Through DHCP option 150 the phones will locate the Unified CM TFTP server and auto-register with Unified CM, which configures each phone with a temporary DN. The phone deployment option enables externsion mobility, sets the phone’s home device pool and assigns it the correct calling search space by matching the phones IP address with the DMI subnet and mask associated with each location.

When all phones have registered, click Search to display the list of phones. Remove the phones that do not need to be updated and click Configure to enable the features for the remaining phones.

Function | Description | Note
Search | Unified CM: IP Address Username Password | Connect to Unified CM and list all phones.
Configure | Enable EM, update home device pool and calling search space | Enable Extension Mobility, change the home device pool and calling search space based on the IP address of the phone matching the DMI subnet and mask. Submit configuration Immediately. After a few minutes all phones will reset & reregister to Unified CM.