Cisco Systems ASR 1000 manual Association Reset, Silent Gate Deletion, 11-4

Chapter 11 Quality Monitoring and Statistics Gathering

Enhanced Event Notification and Auditing

Association Reset

Aconfiguration option (the h248-association-timeoutcommand) has been added that allows an alternative association reset behavior. The possible options are:

•The it/ito event is the only event where failure to notify the SBE about it causes the H.248 association with the SBE to be reset. (This behavior is the default and the standard H.248 protocol behavior.)

•Failure of any event notification causes an H.248 association with the SBE to be reset.

Silent Gate Deletion

To prevent silent gate deletion, a configuration option (the h248-preserve-gatescommand) has been added that allows you to block this behavior. When silent gate deletion is blocked, all gates (media terminations and contexts) remain on the device until they are deleted by the SBE or the DBE service is deactivated.

Resetting the Media Timeout Timers

The DBE will stop re-arming the media timeout timers after a pinhole timeout occurs. As a result, the receipt of a packet on a pinhole on which a media timeout has occurred will not generate a media-up notification, or restart the timer again.

The media timeout timers can be restarted by the MGC by its sending in a Modify request for the pinhole. An example of a Modify request is to change the state of an H.248 event subscription. In this case, the Modify request takes the call on hold or off hold and the DBE forwarding process changes the nt/qualert event subscription, which, in turn, restarts the media timeout timers.

DBE Restrictions

The following are DBE restrictions for Enhanced Event Notification and Auditing:

•After the DBE has determined that the Notify message for a given event occurrence has failed, it does not attempt to send the Notify message again.

•The event buffering model of DBE is unchanged. The DBE continues to detect and report events that match the current events descriptor.

•Receipt of a transaction response acknowledgement for an AuditValue response is not used to clear the ObservedEvents descriptor.

Related Commands

The h248-event-storagecommand enables permanent H.248 event storage, which retains all H.248 events until the stream on which they occurred is deleted.

The h248-association-timeoutcommand configures the DBE to reset associations with a SBE when the controller does not respond to an event notification.

The h248-preserve-gatescommand configures the DBE to preserve the media terminations or contexts when there is a media timeout while the association with the controller is down.

	Cisco IOS XE Integrated Session Border Controller Configuration Guide for the Cisco ASR 1000 Series Aggregation Services Routers
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