A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging from small key telephone systems to large-scale private branch exchanges.
Functions of PBX:
1. Establishing connections (circuits) between the telephone sets of two users (e.g. mapping a dialed number to a physical phone, ensuring the phone isn't already busy).
2. Maintaining such connections as long as the users require.
3. Providing information for accounting purposes
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PANASONIC
