The primary purpose of MPS for Voice is to provide the Service User with priority voice communication sessions in periods of severe network congestion during which normal commercial voice service is degraded. MPS for Voice provides priority for MMTEL voice and MMTEL voice teleconferencing sessions. In most scenarios during a National Security / Emergency Preparedness (NS/EP) condition, it is expected that MPS for Voice is activated in response to service degradation or when the Service User is aware of network congestion. In limited situations, e.g., when in an area with network congestion, it is possible to proactively invoke MPS for Voice. In all cases, basic connectivity is required in advance of priority service invocation, and special consideration needs to be provided to permit service invocation messages to be delivered during times of congestion.

The primary purpose of the MPS for Transport Service (DTS) is to provide the Service User with priority for applications using the default bearer (in the case of 4G), default QoS flow (in the case of 5G) to one or more selected active Packet Data Networks (PDNs)/Data Networks (DNs) in periods of severe network congestion during which normal commercial data service is degraded. It includes access to an enterprise network (e.g., government agency private enterprise network). In most scenarios during NS/EP condition, it is expected that the DTS is activated in response to service degradation due to network congestion. In limited situations, e.g., when driving into an area with network congestion, it is possible to proactively invoke the DTS. In all cases, basic connectivity is required in advance of priority service invocation, and special consideration needs to be provided to permit service invocation messages to be delivered during times of congestion. For enterprise access, a Virtual Private Network (VPN) connection is generally established via the originating access network, core network, and the terminating access network to the enterprise network. In this case, the DTS is the means to achieve improved throughput/performance in times of severe network congestion. For an IoT device, MPS for DTS provides the IoT device with priority for applications using a specific default bearer (in the case of 4G), default QoS flow (in the case of 5G) towards a single specified PDN/DN, and in the case of IoT connectivity with an enterprise, also provides priority for the terminating access network to the enterprise.

The primary purpose of MPS for Video is to provide the Service User with priority video communication sessions in periods of severe network congestion during which normal commercial video service is degraded. MPS for Video provides priority for MMTEL video, streaming video, and MMTEL video teleconferencing sessions. Priority for Over-The-Top (OTT) video obtained via the use of the DTS is not part of MPS for Video. In most scenarios during an NS/EP condition, it is expected that MPS for Video is activated in response to service degradation or when the Service User is aware of network congestion. In limited situations, e.g., when in an area with network congestion, it is possible to proactively invoke MPS for Video. In all cases, basic connectivity is required in advance of priority service invocation, and special consideration needs to be provided to permit service invocation messages to be delivered during times of congestion.