Telephonic communications – Reception of calling information at substation in wireline... – Blocking caller id transmission
Patent
1988-10-03
1989-11-07
Dwyer, James L.
Telephonic communications
Reception of calling information at substation in wireline...
Blocking caller id transmission
379201, 379210, 379211, 379213, 379212, 379214, 379235, H04M 706
Patent
active
048797430
ABSTRACT:
A PBX system is responsive to an incoming call which is directed to an adjunct of the system for sending a ringing signal over a station facility to the adjunct. When the adjunct goes off-hook, the system outputs to the adjunct over the station facility multi-frequency tones containing information associated with the incoming call prior to establishing a connection between the adjunct and calling party. The information selects the proper operating mode of the adjunct and provides other call processing information to the adjunct. The adjunct communicates information to the PBX using a switch-hook flash and multi-frequency tones.
REFERENCES:
patent: 3264415 (1966-08-01), Burns et al.
patent: 3443032 (1969-05-01), Mitsui
patent: 4150257 (1979-04-01), Fenton et al.
patent: 4304968 (1981-12-01), Klausner
patent: 4571462 (1986-02-01), Jannssen
patent: 4646346 (1987-02-01), Emerson et al.
patent: 4674082 (1987-06-01), Flanagin et al.
Burke Edmund T.
Dawdy Daniel H.
Rubert Timothy M.
American Telephone and Telegraph Company
AT&T Information Systems Inc.
Caccuro John A.
Dwyer James L.
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