/mcpAccept BLF Presence Requests from External Trunks and Applications To allow BLF presence requests from outside the cluster, configure the system to accept BLF presence requests from the external trunk or application. You can assign BLF presence groups to trunks and applications outside the cluster to invoke BLF presence group authorization. Before you begin Associate BLF presence group with devices and users by performing the following subtasks: • Associate BLF Presence Groups with Phone, on page 534 • 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 Procedure Step 1 From Cisco Unified CM Administration, choose Device > Trunk, and click Add New. The Trunk Configuration window appears. Step 2 To allow BLF presence requests from a SIP trunk, check the Accept Presence Subscription check box in the SIP Trunk Security Profile Configuration window. Step 3 To enable application-level authorization for a SIP trunk application in addition to trunk-level authorization, check the following check boxes in the SIP Trunk Security Profile Configuration window: • Enable Digest Authentication • Enable Application Level Authorization Note You cannot check Enable Application Level Authorization unless Enable Digest Authentication is checked. Step 4 Apply the profile to the trunk. Click Reset so that the changes to the trunk can take effect. Note If you checked Enable Application Level Authorization, check the Accept Presence Subscription check box in the Application User Configuration window for the application. Configure a Calling Search Space for Presence Requests The SUBSCRIBE Calling Search space option allows you to apply a calling search space separate from the call-processing Calling Search Space for BLF presence requests. Select a different calling search space for presence requests, else the SUBSCRIBE Calling Search Space selects the None default option. The SUBSCRIBE Calling Search Space that is associated with an end user is used for extension mobility calls. You apply the SUBSCRIBE Calling Search Space to the SIP trunk, phone, or end user. The SUBSCRIBE Calling Search Space that is associated with an end user is used for extension mobility calls. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 538 Presence and Privacy Features Accept BLF Presence Requests from External Trunks and Applications