This attribute specifies the discard priority for outgoing call using
this DLCI.
The discard priority has three provisioning values: normal, high,
and useDnaDefPriority. Traffic with normal priority are discarded
first than the traffic with high priority. The Dna default value
(provisioned by outDefaultPriority) is taken if this attribute is set to
the value useDnaDefPriority.
The default of discardPriority is useDnaDefPriority.