Camp-on detecting system for automatic telephone exchange

Details Camp-on detecting system for automatic telephone exchange Camp-on detecting system for automatic telephone exchange

1974-05-17

1976-02-03

Cooper, William C.

H04M 342

Patent

active

039366138

ABSTRACT:
A camp-on detecting system for a private automatic branch exchange (PABX) is provided with the camp-on connecting function for connecting queuing or camp-on calls to a busy line circuit. On detecting that the control line of the line circuit is at a busy potential, the potentials on the control lines of all camping-on trunks are changed and the potential changes are detected by the detecting means connected to the line circuit to detect that a camp-on connection has already been made to the line circuit.

REFERENCES:
patent: 3355555 (1967-11-01), Thelemaque
patent: 3676606 (1972-07-01), Gueldenpfennig et al.
patent: 3796836 (1974-02-01), Monleone

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