In addition to wireless telephones, the SpectraLink WTS consists of two component types: Master Control Units (MCU) and Base Stations. MCUs are modular units that connect to station ports of the host telephone system. Base Stations are fixed transceivers that are connected to the MCUs, and located in a manner to provide coverage of the workplace area. Multiple Base Stations are supported to ensure the elimination of dead spots. Supported systems include: Comdial, Fujitsu, Inter-Tel, Lucent, Mitel, NEC, Nortel, Panasonic, Siemens, and Toshiba. No switch uprgades or enhancements are required. more... See more text