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Flexible DSCP Marking and Video Promotion Interactions Table 81: Flexible DSCP Marking and Video Promotion Interactions Interaction Device The Flexible DSCP Marking and Video Promotion feature is supported over SIP intercluster trunks. SIP Intercluster Trunks The Flexible DSCP Marking and Video Promotion feature is supported for SCCP devices. Skinny Client Control Protocol (SCCP) Devices If pass-through MTPs are inserted in a call, Unified Communications Manager signals the MTP to mark the packets with the DSCP marking that is expected from the endpoint device that originally emitted the packet for the video stream. If the two endpoints on a call use different DSCP markings (for example, a Cisco TelePresence immersive video endpoint and a desktop video endpoint without Video Promotion), the MTPs preserve the DSCP marking in each stream direction. Pass-Through MTPs Flexible DSCP Marking and Video Promotion Restrictions Table 82: Flexible DSCP Marking and Video Promotion Restrictions Description Restriction The Flexible DSCP Marking and Video Promotion feature is not supported over H.323 trunks and Media Gateway Control Protocol (MGCP) gateways. Trunks and gateways Cisco recommends that you do not use the Flexible DSCP Marking and Video Promotion feature with Multilevel Precedence and Preemption (MLPP) service calls. When you need MLPP service functionality, Cisco recommends that you set the Video Call QoS Marking Policy and Use Video BandwidthPool for Immersive Video Calls service parameters to their default values. With default values for the Video Call QoS Marking Policy and Use Video BandwidthPool for Immersive Video Calls service parameters, Unified Communications Manager and endpoints use MLPP DSCP markings for the media packets. Multilevel Precedence and Preemption The Flexible DSCP Marking and Video Promotion feature is dependent on desktop SIP video endpoint support. Currently, only Cisco DX650 series SIP phones provide the required endpoint support. SIP video endpoints Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 777 Advanced Call Processing Flexible DSCP Marking and Video Promotion Interactions