Presence detection for cellular and internet protocol telephony
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United States of America Patent
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Oct 5, 2010
Grant Date -
Jun 8, 2006
app pub date -
Jul 18, 2005
filing date -
Jul 16, 2004
priority date (Note) -
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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.
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