Busy-test arrangement for electronic private automatic branch ex

Details Busy-test arrangement for electronic private automatic branch ex Busy-test arrangement for electronic private automatic branch ex

1975-01-22

1976-06-15

Cooper, William C.

179 18ES, H04Q 354

Patent

active

039638740

ABSTRACT:
In an electronic private automatic branch exchange telephone system, busy test is carried out by way of a two step process. Initially, a junctor memory is scanned and the called number is compared with each ING and ED number contained in memory. At the completion of the scan and comparison a check of the calling bridge relay of the called number is made. Associated with the busy test arrangement are camp-on and call-waiting features which may also be carried out during the test.

REFERENCES:
patent: 3549813 (1970-12-01), Tanke et al.
patent: 3649767 (1972-03-01), Muroga et al.
patent: 3673340 (1972-06-01), Casella et al.
patent: 3819865 (1974-06-01), Weber et al.
patent: 3868482 (1975-02-01), Colas

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