/mcpProcedure Step 1 From Cisco Unified CM Administration, choose System > Security > SIP Trunk Security Profile. Step 2 Perform one of the following steps: • Click Add New to create a new SIP trunk security profile. • Click Find to search and select an existing profile. Step 3 In the Name field, enter a name for the profile. Step 4 Configure the Device Security Mode field value to Encrypted or Authenticated. Step 5 Configure both the Incoming Transport Type and Outgoing Transport Type field values to TLS. Step 6 Complete the remaining fields of the SIP Trunk Security Profile window. For help on the fields and their configuration, see the online help. Step 7 Click Save. Note This Note is applicable from Release 15SU2 onwards. When the minimum supported TLS version on Unified CM is set to 1.3, the trunks with Authenticated Device Security Mode will fail to connect with the destination. Add Secure Profile to a SIP Trunk Use this procedure to assign a TLS-enabled SIP trunk security profile to a SIP trunk. You can use this trunk to create a secure connection to resources, such as conference bridges. Procedure Step 1 From Cisco Unified CM Administration, choose Device > Trunk. Step 2 Click Find to search and select an existing trunk. Step 3 For the Device Name field, enter a device name for the trunk. Step 4 From the Device Pool drop-down list, choose a device pool. Step 5 From the SIP Profile drop-down list, choose a SIP Profile. Step 6 From the SIP Trunk Security Profile drop-down list, choose the TLS-enabled SIP Trunk Profile that you created in the previous task. Step 7 In the Destination area, enter the destination IP address. You can enter up to 16 destination addresses. To enter additional destinations, click the (+) button. Step 8 Complete the remaining fields in the Trunk Configuration window. For help with the fields and their configuration, see the online help. Step 9 Click Save. Note Security Guide for Cisco Unified Communications Manager, Release 15 and SUs 198 Basic System Security Add Secure Profile to a SIP Trunk