This sets the value written into the IP Type-of-Service byte (interpreted as either IP precedence or DSCP bits depending on configuration) for packets carrying this UDP-over-IP pseudowire's traffic. Administrators use it to mark pseudowire traffic with a specific QoS classification so it receives appropriate priority handling across the IP network it traverses. Setting this object to a DSCP value corresponding to expedited forwarding would help ensure this pseudowire's traffic, such as emulated voice circuits, gets low-latency treatment across the network.