Arrangement for requesting service for called telephone subscrib

Details Arrangement for requesting service for called telephone subscrib Arrangement for requesting service for called telephone subscrib

1980-07-07

1982-03-16

Brown, Thomas W.

179 18HB, H04M 304, H04M 342

Patent

active

043202586

ABSTRACT:
An improved ringing control circuit in a stored program telephone switching system which provides a called subscriber an interval or window of time after answering a call to send a request for special services such as identification of the number of the calling party. This time interval, initiated when ringing is tripped, delays operation of current sensitive devices which sense current flow in the subscriber line when the party answers the call. This delays completion of the connection by the systems processor which periodically scans the conditions of the current sensitive devices. A detecting device is also provided in the control circuit to detect receipt of the request for service signal during the time interval.

REFERENCES:
patent: 3378650 (1968-04-01), Goeller
patent: 3963875 (1976-06-01), Gueldenpfennig
patent: 4054756 (1977-10-01), Comella et al.
patent: 4071699 (1978-01-01), Jovic et al.

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