1.定义TETRA终端（MSs）可用的服务，终端用户在集群模式和直接模式下临时禁止所有传输。识别将终端3的“仅接收”状态通知TETRA基础设施所需的任何附加信令消息。起草任何必要的协议变更要求

1. To define the services that would be available for TETRA terminals (MSs) from which all transmissions are temporarily inhibited by the terminal user in both Trunked Mode and Direct Mode 2. To identify any additional signalling messages that are required to inform the TETRA infrastructure of the 'receive-only' status of the terminal 3. To draft any necessary protocol change requirements