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Cisco IOS XE Integrated Session Border Controller Configuration Guide for the Cisco ASR 1000 Series Aggregation Services Routers
OL-15421-01
Chapter 11 Quality Monitoring and Statistics Gathering
Enhanced Event Notification and Auditing
Association Reset
A configuration option (the h248-association-timeout command) 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-gates command) 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-storage command enables permanent H.248 event storage, which retains all H.248
events until the stream on which they occurred is deleted.
The h248-association-timeout command configures the DBE to reset associations with a SBE when the
controller does not respond to an event notification.
The h248-preserve-gates command configures the DBE to preserve the media terminations or contexts
when there is a media timeout while the association with the controller is down.