Method and apparatus for maintaining SIP contact addresses

Details Method and apparatus for maintaining SIP contact addresses Method and apparatus for maintaining SIP contact addresses

2003-07-23

2009-02-03

Lee, Philip C (Department: 2152)

Electrical computers and digital processing systems: multicomput

Miscellaneous

C709S230000, C709S231000, C709S202000, C709S245000, C455S456500, C455S435100, C370S338000, C370S349000

Reexamination Certificate

active

07487199

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.,123or124) 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 SIP200OK 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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U.S. Appl. No. 60/361,596.

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