In a conventional, analog two-way radio system, a standard radio has noise squelch or carrier squelch which allows a radio to receive all transmissions. Selective calling is used to address a subset of all two-way radios on a single radio frequency channel. Where more than one user is on the same channel, (co-channel users,) selective calling can ...
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http://en.wikipedia.org/wiki/Selective_calling
in a radio system, a call using a special coded signal and generally automatic devices connected to receivers, which only warns preselected stations
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=713-03-47
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