/mcpStep 5 (Optional) In the Secure-Service URL field, enter the following value, where server is the server where the Change Credential IP phone service runs: https://server:8443/changecredential/ChangeCredentialServlet?device=#DEVICENAME# Step 6 Configure the remaining fields in the IP Phone Services Configuration window, and choose Save. Step 7 To subscribe the Cisco Unified IP Phone to the Change Credential IP phone service, choose Device > Phone. Step 8 In the Phone Configuration window, go to the Related Links drop-down list and choose Subscribe/Unsubscribe Services. Step 9 Click Go. Step 10 From the Select a Service drop-down list, choose the Change Credential IP phone service. Step 11 Click Next. Step 12 Click Subscribe. Step 13 Click Save. Configure Service Parameters for Extension Mobility (Optional) If you want to modify the behavior of extension mobility, configure the service parameters. Procedure Step 1 From Cisco Unified CM Administration, choose System > Service Parameters. Step 2 From the Server field, choose the node that is running the Cisco Extension Mobility service. Step 3 From the Service field, choose Cisco Extension Mobility. Step 4 Click Advanced to show all service parameters. See Extension Mobility Service Parameters, on page 410 for more information about these service parameters and their configuration options. Step 5 Click Save. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 409 Receiving Calls Configure Service Parameters for Extension Mobility