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CallPreemptionReason Enumeration

Call Preemption reasons based on Reason Header for Preemption Events(RFC 4411) - IETF and Department of Defense Unified Capabilities Requirements 2013. Call preemption occurs when a precedence call is sent to a preemptable endpoint that is busy with a call of lower precedence and has no idle appearances. This causes the lower precedence call to be preempted, regardless of whether the lower precedence call and the new higher precedence call are of the same media type. When preemption occurs, the active busy user receive a continuous preemption tone until user acknowledges the preemption by invoking complete preemption method and the other party receives a preemption tone for a minimum of 3 seconds. After acknowledging the preemption, the extension to which the precedence call is directed will be provided with precedence ringing and the calling party will receive an audible ring - back precedence tone. Preemption may take one of two forms. First, the called party may be busy with a lower precedence call that is preempted in favor of completing the higher precedence call from the calling party. Second, the network resources may be busy with calls; some of which are of lower precedence than the call requested by the calling party.One or more of these lower precedence calls are preempted in order to complete the higher precedence call

Namespace:  Avaya.ClientServices
Assembly:  AvayaClientServices (in AvayaClientServices.dll) Version: 550.0.60.0
Syntax
C#
public enum CallPreemptionReason
Members
  Member nameValueDescription
None0 The call is not preempted..
UAPreemption1 The call has been preempted by a UA(User Agent). UA Preemption occurs when called party may be busy with a lower precedence call that is preempted in favor of completing the higher precedence call from the calling party.
ReservedResourcesPreempted2 The call preemption has been initiated within the network via a purposeful RSVP(Resource ReSerVation Protocol) preemption occurrence, and not a link error.
GenericPreemption3 This is a limited - use preemption indication to be used on the final leg to the preempted UA to generalize the event.
NonIPPreemption4 The call preemption has occurred in a non - IP portion of the infrastructure, and this is the Reason cause code given by the SIP Gateway.
NetworkPreemption5 Reason-params in RFC 4411 fails to fully meet Department of Defense needs, the AS - SIP signaling appliances support a fifth Reason - param intended to characterize a network preemption event that occurs in the IP portion of the network but is not due to a RSVP preemption occurrence.
See Also