The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 2006
Filed:
Aug. 02, 2004
Applicant:
John C. Johnson, Thornton, CO (US);
Inventor:
John C. Johnson, Thornton, CO (US);
Assignee:
T-NETIX, Inc., Englewood, CO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M 3/00 (2006.01); H04B 3/20 (2006.01); H04M 9/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method and apparatus for detecting whether a remote party has added a secondary telephone destination to a telephone call, for example through the activation of three-way calling service, conference calling or two lining bridging, by identifying an echo characteristic to the telephone connection between the local and the remote telephone and monitoring the echo characteristic to determine whether there is a significant change. The addition of a secondary telephone destination can be verified by continuing to monitor the echo characteristic to determine whether it has returned to its original value.