ZyXEL Communications P-2602H - Manual (Page 155)

Chapter 11 Voice
P-2602H(W)(L)-DxA User’s Guide
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Figure 89 DiffServ: Differentiated Service Field
The DSCP value determines the forwarding behavior, the PHB (Per-Hop Behavior), that each
packet gets across the DiffServ network. Based on the marking rule, different kinds of traffic
can be marked for different priorities of forwarding. Resources can then be allocated
according to the DSCP values and the configured policies.
11.3.3 VLAN Tagging
Virtual Local Area Network (VLAN) allows a physical network to be partitioned into multiple
logical networks. Only stations within the same group can communicate with each other.
Your ZyXEL Device can add IEEE 802.1Q VLAN ID tags to voice frames that it sends to the
network. This allows the ZyXEL Device to communicate with a SIP server that is a member of
the same VLAN group. Some ISPs use the VLAN tag to identify voice traffic and give it
priority over other traffic.
11.4 SIP Settings Screen
Use this screen to maintain basic information about each SIP account. You can also enable and
disable each SIP account. To access this screen, click VoIP > SIP > SIP Settings.
Figure 90 SIP > SIP Settings
DSCP
(6-bit) Unused
(2-bit)