Call state processor for a time division switching system

Details Call state processor for a time division switching system Call state processor for a time division switching system

H - Electricity

04

Q

344/25

H04Q 11/04 (2006.01)

Patent

CA 1120569

- 1 - CALL STATE PROCESSOR FOR A TIME DIVISION SWITCHING SYSTEM Abstract of the Disclosure A semiautonomous digit collection and call state detection subsystem is provided for use in a time division switching system such as a PBX. Each active (call serving) system port circuit applies a hook state signal to a specially provided bus during each occurrance of the time slot to which the port circuit is assigned. The subsystem's logic analyzes these hook state signals to identify certain predetermined call states and to count dial pulses. Output messages representing identified call states and dialed digits are made available to the switch- ing system under control of a system scanner.

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