Michael Jerry Jacobs

US Patent:

40864391, Apr 25, 1978

Filed:

Dec 17, 1976

Appl. No.:

5/751490

Inventors:

Sandra Rae Vowles - Denver CO
Michael Alan Jacobs - Denver CO
Amos Ray Jackson - Salt Lake City UT

International Classification:

H04M 518

US Classification:

179 27DA

Abstract:

An apparatus identifying a class of called telephone lines by extending an identity signal back over the called line to a calling central operator or control. The identifier apparatus includes a signal identity generator connected to the called line, a signal decoder located at a calling central control such as an operator cordboard or traffic service position (TSPS), and a time-out for deactivating the generator after a predetermined time period has elapsed. A method is also set forth where a uniquely coded signal is extended over the communication line to an operator when an "OFF HOOK" condition appears from the called line to warn the operator that the called line is not authorized to receive collect calls.