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. 16, 1995
Filed:
Jul. 19, 1993
Dooyong Lee, West Orange, NJ (US);
AT&T Corp., Murray Hill, NJ (US);
Abstract
Call setup time is reduced by automatically (1) identifying the type of signaling used by a caller to communicate with a central office, and (2) providing an indication of the signaling type to telephone switches or databases that will participate in routing and processing the telephone call. Dual Tone Multifrequency (DTMF) detectors located at a central office of a local exchange carrier detect whether a caller is using DTMF signaling. The local central office includes this information in a signaling message provided, for example, to interexchange carriers and other service providers which will use DTMF signaling during and after call setup. In this manner, the need to query the caller for this information is eliminated.