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 In telecommunications, the term gateway has the following meanings:

 - In a communications network, a network node equipped for interfacing with another network that uses different protocols.
    - A gateway may contain devices such as protocol translators, impedance matching devices, rate converters, fault isolators, or signal translators as necessary to provide system interoperability. It also requires the establishment of mutually acceptable administrative procedures between the two networks.
    - A protocol translation/mapping gateway interconnects networks with different network protocol technologies by performing the required protocol conversions.
 - Loosely, a computer configured to perform the tasks of a gateway.

Gateways, also called protocol converters, can operate at any layer of the OSI model. The job of a gateway is much more complex than that of a router or switch. Typically, a gateway must convert one protocol stack into another.
 GSM is a standard for mobile phones. The ubiquity of the GSM standard makes international roaming very common with "roaming agreements" between operators. It differs significantly from its predecessors in that both signalling and speech channels are digital, which means that it is seen as a second generation (2G) mobile phone system. GSM is an open standard which is developed by the 3GPP.

GSM has retained backward-compatibility with the original GSM phones. At the same time, the GSM standard continues to develop and packet data capabilities were added in the Release'97 version of the standard with GPRS. Higher speed data transmission has been introduced by providing a new modulation scheme with EDGE (Enhanced Data rates for GSM Evolution).