Patent · US Active

Presence detection for cellular and internet protocol telephony

US7809381B2 · kind B2 · utility

29Cited by

109References

18Claims

0Family size

Assignee

Bridgeport Networks, Inc. · US

Inventors

Justin A. Aborn · Hingham, US
Karl Freter · Wheaton, US
Sanjay Subir Jhawar · Menlo Park, US
James O'Brien · Somerville, US
Mats Samuelsson · Stocksund, SE
Bruce Wiatrak · Bolingbrook, US
Andre De Verteuil · Toronto, CA
Ivan Dean Bogdanovic · Brookline, US

Key dates

Filing date	Jul 18, 2005
Grant date	Oct 5, 2010
Priority date	—
Expiry date	Jan 23, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH04W92/02
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A telephone system supports communication with user devices over both a cellular radio network as well as over an Internet Protocol (IP) network, and enables roaming and active call handoff between cellular and IP domains. Approaches to detecting presence of a user near a suitable IP network are used in controlling transitions between the domains, for example, enabling automatic transitions between domains, and delivery of calls to a mobile user to data network devices in the vicinity of the user.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.