Point to Point

Point-to-point (PtP) calls These are basically regular GSM-calls between two devices on the GSM-R network. Broadcast calls One person speaks while the others are listening. A specific type of a broadcast call is the Railways Emergency Call, or REC. This is a broadcast call with the highest priority (REC priority level 0) which is used in case of an emergency. Priority control Multi-Level Precedence and Pre-emption Service (eMLPP) allows the priority of different calls to be set. The default level is 4, used for regular point-to-point calls. The highest level is 0, mainly used for emergency calls. There are higher priority levels (known as A and B); these are reserved for network messages.