Avaya 3641 Installation, Configuration And Administration page 26

Part A: Avaya Voice Priority Processor
DSCP Tag
DSCP (Differentiated Services Code Point) is a QoS mechanism for setting relative
priorities. Packets are tagged with a DSCP field in the IP header for type of service. The
decimal value may be set as a number from 0-63 and may be different for each traffic
class listed on the screen. The default for all traffic classes is 4.
Administration tags set the priority for telnet, TFTP, and other administrative traffic.
Administrative traffic can have the lowest priority because it does not require voice
quality.
WT (In call) traffic requires voice quality and may be set to a higher priority than WT
(Standby) traffic.
RTP traffic is the audio traffic to the IP PBX. It requires voice quality.
PBX traffic is not audio to the PBX.
Inter-SVP2 traffic is the information-passing protocol thate SVP Servers use to
communicate with each other.
When forwarding packets, the SVP Server shall always overwrite the received DSCP
value. The final DSCP tag for packets in each of the traffic classes are assigned a
DSCP value based on the following rules. (Please see table on next page.)
•
If both Administration and the Traffic Class setting is Default, the Default value
as shown in the table below will be used.
•
If Administration is set at any number (Value X) other than Default, that setting
(Value X) it will override the Default value of the Traffic Class.
•
If any of the Traffic Class settings are set at any value (Value Y) other than
Default, that setting (Value Y) will override the Administration setting.
26 Avaya Voice Priority Processor, Avaya 3641/3645 Wireless IP Telephone, Handset Administration Tool
Traffic Class
Default
WT (In call)
Value Y
Default
WT (Standby)
Value Y
Default
RTP
Value Y
Default
PBX
Value Y
Default
Inter-SVP2
Value Y
Administration
Default Value X
4 X
Y Y
0 X
Y Y
4 X
Y Y
0 X
Y Y
0 X
Y Y