LevelOne VOI-8001 - Manual (Page 70)

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4.2.5.7 QoS
/VoIP Setup/Advance Setup/QoS
User can define the ToS field on the VoIP packet for Quality of Service control.
The ToS field is included these 2 parameters:
 Precedence: bit 0,1,2
 DSCP(Diffserv Code Point): bit 3~7
User can select input either IP Precedence or DSCP value. Or input the ToS
binary code directly.