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:
Mar. 11, 2008
Filed:
Nov. 10, 2003
LI Zhang, Alpharetta, GA (US);
Jeffrey P. Cassanova, Hiram, GA (US);
Alan R. Blackburn, Woodstock, GA (US);
Robert B. Collicott, Alpharetta, GA (US);
Li Zhang, Alpharetta, GA (US);
Jeffrey P. Cassanova, Hiram, GA (US);
Alan R. Blackburn, Woodstock, GA (US);
Robert B. Collicott, Alpharetta, GA (US);
Phase Systems LLC, Wilmington, DE (US);
Abstract
An Internet Call Waiting—Voice over Internet Protocol (ICW-VOIP) service that uses a service control point and service node of a Public Switched Telephone Network (PSTN), acting as a gatekeeper and bridge respectively, to enable ICW subscribers to answer telephone calls during an internet session without having to disconnect internet access. The primary network components of the ICW-VOIP service comprise a proxy firewall, a service node, and a gateway. When a PSTN call is placed to a subscriber whose line is being used for internet access, the service control point accesses the subscriber's internet address from a database and transmits a message over the internet to the subscriber giving the subscriber the option to accept the call as a VOIP call. Once accepted, the subscriber places an H.323 call through the gateway to the service node. The service control point also forwards the PSTN call to the service node. Using bridging information, the service node matches the subscriber H.323 call and PSTN call and bridges them together to provide a VOIP connection.