Nortel Networks Confidential | Overview 25 |
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Network address book
Client Address Book information is stored in the network so that it can be accessed from all clients. The information is downloaded in bulk whenever a client comes on line (either through a Simple Object Access Protocol [SOAP] interface or direct database access depending on the client).
In order to receive updates to the Address Book after the initial download, the client subscribes to the Address Book event package and updates it as needed. Whenever an update is made through the Personal Agent or one of the clients, a Notify message is sent to the client indicating which entries have changed. The client can then incrementally update their view of the information (again either through a SOAP interface or direct database access depending on the client).
A List of Buddies is incorporated as part of the Address Book. Each subscriber must create their own personal Address Book and designate their own Buddies. For each of these specified entries, the client automatically subscribes to their presence event package. This allows them to monitor and update the network presence of each Buddy (for example, online or offline).
Overload control
Overload Control monitors the Incoming Protocol Message Queue Length. If this queue length crosses a configurable threshold value, the system performs Session Blocking, allowing no new incoming requests to process. The system does, however, continue to process requests for an established session. For rejected requests, the system sends a “503 Service Unavailable” response with a
Note that multiple thresholds may be crossed simultaneously. If this occurs, the appropriate actions are invoked and are not cleared until all aspects of the system have crossed below the assigned threshold value.
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