ABBREVIATIONLED Light Emitting DiodeM MAC Media Access ControlMCONF Multi ConferenceMCP Main Control ProcessorMGC Multi Group ConferenceMJOIN Multi Join conferenceO OS Operating SystemP PCB Printed Circuit BoardPRI Private Rate InterfacePSTN Public Switched Telephone NetworkR RAM Random Access MemoryS SIP Session Initiation ProtocolSPA Single Participant AnnouncementU UART Universal Asynchronous Receiver and TransmitterUTP Unshielded Twisted Pair wireW WIP Wireless Intelligent Peripheral56 ⓒ SAMSUNG Electronics Co., Ltd.