Detecting whether a telephone line has been disconnected

Details Detecting whether a telephone line has been disconnected Detecting whether a telephone line has been disconnected

1994-04-19

1995-09-12

Hofsass, Jeffery A.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379386, 379385, 379100, 379216, H04M 1110

Patent

active

054504856

ABSTRACT:
Apparatus for detecting whether a telephone call has been disconnected, which apparatus includes: (a) a click detector for detecting a click and for generating a "click indication"; (b) a telephone handset impact detector for detecting a telephone handset impact and for generating a "handset impact indication"; (c) a silence detector for detecting silence and for storing a "silent indication"; (d) a timer for determining a predetermined time interval and for transmitting a signal to a controller whenever the time period expires; wherein, in response to the signal, the controller analyzes the "click indication", the handset impact indication", and the "silent indication" to determine whether a predetermined sequence of handset impact, clicks, and silence was detected and, if so, for generating a signal indicating that the telephone call has been disconnected.

REFERENCES:
patent: 4319091 (1982-03-01), Meri

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