Early dating router validating identity error

This opened up opportunities for private Answering Service businesses.

These services forwarded out-of-hours calls to a private answering company.

Telephone sets and apparatus were developed that allowed multiple lines to be answered on a single telephone set.

PBXor private branch exchangeis a term that refers to any type of telephone switch that is located on the customer premises and provides service between telephones inside a single building or internal to a school, factory, or office.

It was developed originally for residential use but soon proved popular with small businesses.

This was the first PBX system that did not require an attendant to direct calls.

Each telephone used with the 750 PBX had five buttons on the base.

756 PBX By the early 1950s, Bell System researchers were eager to develop a larger crossbar switch.

The 755 crossbar PBXintroduced years earlier, in 1938was an excellent switch but could handle only up to 20 lines.

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