There was a time when work typically meant going to an office, so it’s not surprising that traditional business phone systems were built around a single, static location. Depending on size, a facility could install a premise-based key system or PBX or could choose central office-based Centrex. Either of the on-site options typically involved a capital expenditure, took up space, anything from a closet to a room. It entailed maintenance, repair, and general "care and feeding” of the system, so the user either had to hire a telecom manager to handle moves, changes, and software updates or pay a contractor for support.
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