intercom

An in-store communication system used by employees to speak with one another.
Found on http://www.encyclo.co.uk/local/20108

Intercom

An intercom (intercommunication device), talkback or doorphone is a stand-alone voice communications system for use within a building or small collection of buildings, functioning independently of the public telephone network. Intercoms are generally mounted permanently in buildings and vehicles. Intercoms can incorporate connections to public add...
Found on http://en.wikipedia.org/wiki/Intercom
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