Private branch exchange apparatus

Details Private branch exchange apparatus Private branch exchange apparatus

1995-08-01

1997-08-05

Zele, Krista M.

Telephonic communications

Polystation line system

Revertive call

379198, 379251, 379350, 379373, H04M 302

Patent

active

056550120

ABSTRACT:
In a private branch exchange apparatus having a plurality of extension ports, each extension port capable of connecting a push button telephone and a general standard type telephone in parallel, when a call occurs at one extension port where the parallel connection has been done, a ring sound can be produced at the push button or standard type telephone selectively. An additional dialling provides the selection between the push button and the standard type telephone. A memory may specify either of the push button or standard type telephone to be ringed. A call between the push button telephone and the standard type telephone can be provided in accordance with the additional dialing or data stored in a memory.

REFERENCES:
patent: 3626106 (1971-12-01), Greening et al.
patent: 4985916 (1991-01-01), Tachuk et al.
patent: 5048080 (1991-09-01), Bell et al.
patent: 5267307 (1993-11-01), Izumi et al.
patent: 5291549 (1994-03-01), Izumi

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