The value of tmnxMobServS11GtpcDdnDumpTimer specifies the Downlink Data
Notification (DDN) dumping timer. If the SGW receives an 'Unable to
page UE' code in a DDN Ack, the SGW will stop sending DDNs for that
particular UE until the dampening timer expires. The SGW will also
discard DL packets during this interval.
If the timer is set to 0 seconds, the SGW will not perform dampening.