LevelOne SIP IP PBX VOI-9300 - Manual (Page 54)

2007-11-21 54 5
8.7.4 Network Parameter
The network parameters allow to enable/disable IP network functions.
Support Voice Priority Tag (TOS/DSCP)
TOS (Type of Service) and DSCP (Differentiated Services Code Point) are used to set different priority
to data packet and data flow, thus enabling QoS in IP communication.
TOS has four values; they are minimum delay (TOS_LOWDELAY), max throughput
(TOS_THROUGHPUT), max reliability (TOS_RELIABILITY) and minimum cost (TOS_MINCOST).
TOS can be one of them in practice.
DSCP field is a superset of TOS, its definition is backward-compatible with TOS, and its value can be
from 0 to 63, with 0 for minimum priority, 63 for max priority.
Support Tag-based VLAN 802.1P/802.1Q.
VLAN 802.1P/802.1Q are for local area network standard recommended by IEEE, which can partition
network users from different physical locations into several logical subnets. The VOI-9300 IP-PBX
supports this standard, and can add special VLAN Tag to data frames passing through.