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:
May. 21, 1996
Filed:
Dec. 01, 1994
Thomas J Moquin, Alpharetta, GA (US);
David G Kelley, Jr, Tucker, GA (US);
Evan Kraus, Atlanta, GA (US);
Eric R Quinn, Decatur, GA (US);
Raymond J Smets, Alpharetta, GA (US);
Terry Durand, Marietta, GA (US);
BellSouth Corporation, Atlanta, GA (US);
Abstract
In connection with enhanced telephone service, such as personal number service, the detection of whether an incoming telephone call is a facsimile transmission or an ordinary voice call is improved by a utilizing a modified ring back signal during the time in which the service circuit node of the telephone system is attempting to detect the presence of the calling tone (CNG signal) of the sending facsimile machine. Particularly, the ring back signal is modified to increase the off time of the ring back signal to be greater than the period of the CNG signal. Where the CNG signal is a periodic signal with a period of 4 seconds with a 0.5 on time and a 3.5 off time, the modified ring back signal has a period of 7 seconds with a 2 second on time and a 5 second off time.