A 1 in any of the position masks or disables IPQoS processing in that particular callout position. For example, a value of 0x01 disables IPQoS processing for all the local inbound packets.
The default value is 0, meaning that IPQoS processing is enabled in all the callout positions.
0 (0x00) to 15 (0x0F). A value of 15 indicates that IPQoS processing is disabled in all the callout positions.
If you want to enable or disable IPQoS processing in any of the callout positions.