Key telephone system signal priority arrangement

Details Key telephone system signal priority arrangement Key telephone system signal priority arrangement

1976-05-24

1978-06-20

Cooper, William C.

179 18AD, 179 27FE, H04M 100

Patent

active

040963586

ABSTRACT:
A key telephone system signal priority arrangement is disclosed wherein each type of call in a key telephone system is assigned a distinctive priority. When a call is directed to a station engaged in an existing lower priority call, a warning tone is given to both parties engaged in this existing call. The existing call is then automatically placed on hold while the preempting call is completed to the called station such that the called station can answer the preempting call "hands-free".

REFERENCES:
patent: 3509285 (1970-04-01), Banks et al.
patent: 3584151 (1971-06-01), Kielar
patent: 3904834 (1975-09-01), Shinoi et al.
patent: 3976847 (1976-08-01), Bidlack et al.
patent: 3979563 (1976-09-01), Kita et al.
patent: 4011415 (1977-03-01), Takematsu

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