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:
Dec. 29, 2009
Filed:
Feb. 14, 2005
Mehryar Khalili Garakani, Westlake Village, CA (US);
Hanh Luong, Santa Barbara, CA (US);
Brooks S. Read, Concord, MA (US);
Steven J. White, San Mateo, CA (US);
Ilya Umansky, San Jose, CA (US);
Herbert M. Wildfeuer, Santa Barbara, CA (US);
Mehryar Khalili Garakani, Westlake Village, CA (US);
Hanh Luong, Santa Barbara, CA (US);
Brooks S. Read, Concord, MA (US);
Steven J. White, San Mateo, CA (US);
Ilya Umansky, San Jose, CA (US);
Herbert M. Wildfeuer, Santa Barbara, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
An improved method and system for connecting Super Group 3 fax machines over network gateways that operate using the un-enhanced T.38 protocol. With the present invention, the CM tone is suppressed. Thus a gateway that generates an AnsAm tone, will not receive a CM tone in response. The T.38 protocol does not specify what occurs if a CM tone is not received; however, it has been found that, in practice, existing fax machines fall back to V.21 mode if a CM tone is not received.