Signaling state management system for packet network gateways
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United States of America Patent
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-
Jun 25, 2002
Grant Date -
Dec 27, 2001
app pub date -
Dec 7, 2000
filing date -
May 8, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A signal state management (SSM) system avoids both the overhead of maintaining call state and complex signaling in a packet network gateway, while simultaneously providing a more scalable system by not placing too great a state or processing burden on the signaling or call processing server. The SSM system sends an event/action table from a call agent to the gateway that directs the gateway to detect and accumulate specified signaling events generated by a telephone. The gateway accumulates the signaling events according to the event/action table and notifies the call agent only when the signaling events specified in the event/action table are detected. The call agent then sends a new event/action table to the gateway that commands the gateway to detect and accumulate a new set of signaling events. After notifying the call agent, the gateway operates in a quarantine where all signaling events are queued. The gateway remains in the quarantine state until the new event/action table is received from the call agent.
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