This is the priority level, 1 as highest through 8 as lowest, assigned to this QoS rule's traffic, but it only takes effect when the QoS subsystem is running in 'Maximum Bandwidth & Priority' mode. Because higher-priority queues get served first during contention on the satellite link, this is the knob an admin turns to ensure latency-sensitive traffic, such as priority1 for voice signaling, is serviced ahead of best-effort traffic like priority8 for background downloads. For example, assigning priority1 to an RTP voice rule and priority8 to a generic ftp rule ensures calls stay clear even while a large file transfer is saturating the link.