/mcpDescription Setting From the drop-down list, select one of the following filter options: • Use Default Filter—The SIP trunk uses the default filter that is indicated in the SIP V.150 Outbound SDP Offer Filtering service parameter. To locate the service parameter, go to System > Service Parameters > Clusterwide Parameters (Device-SIP) in Cisco Unified Communications Manager Administration. • No Filtering—The SIP trunk performs no filtering of V.150 SDP lines in outbound offers. • Remove MER V.150—The SIP trunk removes V.150 MER SDP lines in outbound offers. Select this option to reduce ambiguity when the trunk is connected to a pre-MER V.150 Unified Communications Manager. • Remove Pre-MER V.150—The SIP trunk removes any non-MER compliant V.150 lines in outbound offers. Select this option to reduce ambiguity when your cluster is contained in a network of MER compliant devices that are incapable of processing offers with pre-MER lines. Note You have to configure IOS on SIP for V.150 to make a secure call connection. For more information to configure IOS on Unified Communications Manager, see http://www.cisco.com/c/en/us/td/docs/ios/12_4t/12_4t4/mer_cg_15_1_ 4M.html. SIP V.150 Outbound SDP Offer Filtering Apply SIP Trunk Security Profile You apply a SIP trunk security profile to the trunk in the Trunk Configuration window. To apply a security profile to a device, perform the following procedure: Procedure Step 1 Find the trunk, as described in the Administration Guide for Cisco Unified Communications Manager. Step 2 After the Trunk Configuration window displays, locate the SIP Trunk Security Profile setting. Step 3 From the security profile drop-down list, choose the security profile that applies to the device. Step 4 Click Save. Step 5 To reset the trunk, click Apply Config. If you applied a profile enabling digest authentication for SIP trunks, you must configure the digest credentials in the SIP Realm window for the trunk. If you applied a profile enabling application-level authorization, you must configure the digest credentials and allowed authorization methods in the Application User window, if you have not already done so. Security Guide for Cisco Unified Communications Manager, Release 15 and SUs 192 Basic System Security Apply SIP Trunk Security Profile