/mcpDescription Restriction Only MLPP Indication Enabled devices generate MLPP-related notifications, such as tones and ringers. If a precedence call terminates at a device that is not MLPP Indication Enabled, no precedence ringer gets applied. If a precedence call originates from a device that is not MLPP Indication Enabled, no precedence ringback tone is applied. If a device that is not MLPP Indication Enabled is involved in a call that is preempted (that is, the other side of the call initiated preemption), no preemption tone gets applied to the device. Note Before Release 15SU3, MLPP notifications did not appear on call-originating SIP endpoints until the call was connected when using a route or translation pattern. Starting with Release 15SU3, Unified CM supports MLPP notifications on specific SIP phone models. This feature enables these models to play precedence ringback notifications before the call connects. The supported models are the Cisco Desk Phone 9841, Cisco Desk Phone 9851, Cisco Desk Phone 9861, Cisco Desk Phone 9871, and Cisco Video Phone 8875 (including Non-Radio models). MLPP Notification For phones, devices that are MLPP indication disabled (that is, MLPP Indication is set to Off) cannot be preempted. For trunks, MLPP indication and preemption function independently. Phones and trunks Turning on MLPP Indication (at the enterprise parameter, common device configuration, or device level) disables normal Ring Setting behavior for the lines on a device, unless MLPP Indication is turned off (overridden) for the device. Ring Setting Behavior IOS gateways support the SCCP interface to Cisco Unified Communications Manager. They support BRI and analog phones that appear on Cisco Unified Communications Manager as supported phone models. SCCP phones support the MLPP feature, and so do some phones with specific SIP loads. See the relevant phone administration and user guides for Cisco IP phone support information. SCCP Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 843 QoS Management Multilevel Precedence and Preemption Restrictions