Implementations GSM gateway appliance Ī direct-to-mobile gateway is a device that has built-in wireless GSM connectivity. Messages are received by the terminal recognising that the Caller ID is that of the SMSC and going off-hook silently to receive the message. Terminals are usually based on Digital Enhanced Cordless Telecommunications (DECT), but wired handsets and wired text-only (no voice) devices exist. These use frequency-shift keying to transfer the message between the terminal and the Short Message Service Center (SMSC). These are based on extensions to the European Telecommunications Standards Institute (ETSI) Global System for Mobile Communications (GSM) SMS standards and allow messaging between any mix of fixed and mobile equipment. Several mobile telephone network operators have true fixed-wire SMS services.
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