Keyless and indicatorless local telephone switching system

Details Keyless and indicatorless local telephone switching system Keyless and indicatorless local telephone switching system

1980-11-10

1983-03-15

Brown, Thomas W.

179 18AD, 179 99H, H04M 342

Patent

active

043768750

ABSTRACT:
A telephone switching system for interconnection of a plurality of lines with a number of trunks in which telephone sets having no trunk access pushbuttons can access particular trunks upon command. Upon initiating a command signal, i.e. by a subscriber dialing particular access codes, the switching system provides a voiced enunciation of the number of an idle trunk or the number of which trunk is on "hold". The subscriber can then dial the trunk number followed by the number of an outgoing call, or an access code followed by the held trunk number whereby the line is connected to the particular accessed trunk. The system is comprised of a control system, apparatus for connecting a plurality of subscriber's lines to the control system, apparatus for connecting a plurality of trunks to the control system, a junctor system for interconnecting subscribers' lines and trunks under control of the control system, a voice announcement system connected to the control system, apparatus for connecting the voice announcement system to the junctor system upon receipt by the control system of a command signal from a line connected to a subscriber's set, and for enabling the generation of a predetermined announcement and applying it to the line in response thereto, which is designative of an idle or held trunk. The system thus provides the featues of a key telephone system without the requirement for use of multi-button key telephone sets and can also provide features normally associated with a PABX to such subscribers, while eliminating the requirement for an operator's console normally associated with a PABX.

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"New Telephone Service", by M. Murata et al., Japan Telecommunications Review, vol. 22, No. 2, Apr. 1980, pp. 107-111.
"Electronic PABX at Credit Lyonnois in Paris", Y. Guiberteau, Ericsson Review, No. 1, 1976.
"The K1 PABX", J. C. H. Davis, Systems Technology, No. 28, Apr. 1978.

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