/mcpProcedure Step 1 In the Cisco Unified CM Administration, choose Device > Phone, and click Add New. The Add a New Phone window appears. Step 2 From the Phone Type drop-down list, select the type of phone that you want to associate BLF presence group to. Step 3 Click Next. Step 4 Configure the fields in the Phone Configuration window. See the online help for information about the fields and their configuration options. Note From the SUBSCRIBE Calling Search Space drop-down list, select a SUBSCRIBE calling search space to use for presence requests for the phone. All calling search spaces that you configure in Cisco Unified Communications Manager Administration appear in the SUBSCRIBE Calling Search Space drop-down list. If you do not select a different calling search space for the end user from the drop-down list, the value of this field applies the default value as None. To configure a SUBSCRIBE calling search space specifically for this purpose, configure a calling search space as you configure all calling search spaces. Step 5 Click Save. What to do next Associate BLF presence group with devices and users by performing the following subtasks: • Associate BLF Presence Groups with SIP Trunk, on page 535 • Associate BLF Presence Groups with End User, on page 536 • Associate BLF Presence Groups with Application User, on page 537 Associate BLF Presence Groups with SIP Trunk If digest authentication is not configured for the SIP trunk, you can configure the trunk to accept incoming subscriptions, but application-level authorization cannot be initiated, and Unified CM accepts all incoming requests before performing group authorization. When digest authentication is used with application-level authorization, Unified CM also authenticates the credentials of the application that is sending the BLF presence requests. When there is a BLF presence request for a device that exists outside of the cluster, Unified Communications Manager queries the external device through the SIP trunk. If the watcher has permission to monitor the external device, the SIP trunk sends the BLF presence request to the external device, and returns BLF presence status to the watcher. To use BLF presence group authorization with incoming presence requests on a SIP trunk, configure a presence group for the trunk, such as External_Presence_Serv_Group1, and configure the appropriate permissions to other groups inside the cluster. Tip Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 535 Presence and Privacy Features Associate BLF Presence Groups with SIP Trunk