Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 3, 2009
Patent Application Number
10625389
Date Filed
July 23, 2003
Patent Citations Received
Patent Primary Examiner
Patent abstract
The present application describes various embodiments that address the need in wireless environments and within the SIP framework to efficiently maintain SIP contact addresses. It introduces the concept of a SIP proxy user agent (UA) (e.g., 123 or 124) to serve as a gateway between a SIP core network and a SIP-unaware mobile (101). A new parameter, called “created,” is described for the contact header in SIP 200 OK messages, which is used to trigger deregistrations by SIP proxy UAs that no longer serve a particular mobile. It is this process for deregistering SIP proxy UAs that allows SIP contact addresses to be more efficiently maintained.
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