Apparatus for a key telephone system for enabling intercom subst

Details Apparatus for a key telephone system for enabling intercom subst Apparatus for a key telephone system for enabling intercom subst

1976-11-29

1977-12-20

Robinson, Thomas A.

H04M 322

Patent

active

040643719

ABSTRACT:
An attachment to key telephone system apparatus is disclosed which permits an intercom substation to access a trunk telephone line. This includes an intercom-to-trunk line access unit for coupling telephonic communications between its input and a selected one of a plurality of trunk lines connected to its output. The unit contains a selector, an advancing means and means responsive to at least one dial digit selection type signal at an input for advancing the selector to a trunk line directly or by means of a nonbusy trunk hunting mode of operation. Relay means are provided at a key service unit, responsive to operation of push button switch means at the selected intercom substation, for interrupting the communications circuits between the intercom substation and the intercom circuit in the key service unit and establishing the communication circuits between the intercom substation and the input of the intercom-to-trunk access unit. Means are provided to defeat the automatic trunk hunting mode of operation in response to the appearance in sequence of a first signal from the key service unit, representative of a call from the key service unit to the selected intercom station, the intercom station going "off-hook" followed by actuation of said access switch means at said intercom substation while the substation continues in the "off-hook" condition to allow the intercom station to access an incoming call in a trunk line.

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