No answer mode for telephone systems

Details No answer mode for telephone systems No answer mode for telephone systems

1986-02-25

1987-04-21

Dwyer, James L.

Telephonic communications

Special services

Reserved call

H04M 342

Patent

active

046602208

ABSTRACT:
A method for signalling that a called telephone line in a telephone system will not be answered during an incoming call. Each called telephone line has a no answer mode. Incoming calls to a called telephone line in the no answer mode are coupled to a no answer trunk which transmits a distinctive no answer tone to the calling line. The no answer mode for a telephone line is activated by transmitting a no answer command code from the telephone line to a central control. All incoming calls through the central control are screened to determine whether the no answer mode of the called telephone line has been activated. A central control computer contains line information associated with each telephone line coupled to the central control. Each line information segment includes a field which indicates whether the associated telephone line is in the no answer mode.

REFERENCES:
patent: 3570008 (1971-03-01), Downing et al.
patent: 3728486 (1973-04-01), Kraus
patent: 3784721 (1974-01-01), Kilby
patent: 3989901 (1976-11-01), Neuwirth et al.
patent: 4219700 (1980-08-01), Panizzon et al.
patent: 4291199 (1981-09-01), Densmore et al.
patent: 4298774 (1981-11-01), Jusinskas, Jr.
patent: 4481383 (1984-11-01), Madon

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