NEC SL1100, Networking Manual

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Issue 6.0 NEC SL1100
9 - 32 IP Multiline Station (SIP)
7. Press 4 on the dial pad for Port VLAN Priority.
8. Enter the VLAN priority of 0~7. Press the OK soft key after the
setting is changed.
9. If no more changes are made, press the Exit soft key three
times. Then press the Save soft key, and the phone reboots.
13.6 ToS Settings (Layer 3 QoS)
The marking of packets at layer 3 is done by marking the ToS byte in the IP
header of the voice packet. The NEC SL1100 supports two methods for
marking the ToS byte:

IP precedence

DSCP (Diffserv)
IP Precedence
IP Precedence uses the first 3 bits of the ToS field to give eight possible
precedence values (0~7). Under normal circumstances the higher the number
the higher the priority. However this is left to the network administrator for
setup. The administrator may assign this in exactly the opposite manner with
the lower values having a higher priority. Below are the eight common values
for IP precedence.

000 is an IP precedence value of 0, sometimes referred to as routine or
best effort.

001 is an IP precedence value of 1, sometimes referred to as priority.

010 is an IP precedence value of 2, sometimes referred to as immediate.

011 is an IP precedence value of 3, sometimes referred to as flash.

100 is an IP precedence value of 4, sometimes referred to as flash
override.

101 is an IP precedence value of 5, sometimes called critical.

110 is an IP precedence value of 6, sometimes called internetwork
control.

111 is an IP precedence value of 7, sometimes called network control.