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A GSM Intercom works in much the same way as a wired intercom, but instead of using a fixed line from teh gates to the house, it uses GSM technology instead.
A GSM intercom is effectively a type of mobile phone. When the user presses the 'Call' button, the intercom will dial the landline number of the house.
One major difference between wired and GSM intercoms is that a GSM intercom can dial multiple telephone numbers. A GSM intercom also allows the owner to 'ring' the gate requesting it to open.
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