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
Syntaxpublic enum CallPreemptionReason
Members
| Member name | Value | Description |
---|
| None | 0 |
The call is not preempted..
|
| UAPreemption | 1 |
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.
|
| ReservedResourcesPreempted | 2 |
The call preemption has been initiated within the network via a
purposeful RSVP(Resource ReSerVation Protocol) preemption occurrence,
and not a link error.
|
| GenericPreemption | 3 |
This is a limited - use preemption indication to be used on the final leg
to the preempted UA to generalize the event.
|
| NonIPPreemption | 4 |
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.
|
| NetworkPreemption | 5 |
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