ZyXEL Communications P-2602R-DxA Series - Manual (Page 132)

P-2602R/RL-DxA Series User’s Guide
132 Chapter 10 Voice
Figure 63 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.
10.10.3 VLAN
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.
10.10.4 SIP QoS Screen
Use this screen to maintain ToS and VLAN settings for the ZyXEL Device. To access this
screen, click VoIP > SIP > QoS.
Figure 64 SIP > QoS
Each field is described in the following table.
DSCP
(6-bit) Unused
(2-bit)
Table 40 SIP > QoS
LABEL DESCRIPTION
SIP TOS Priority
Setting
Enter the priority for SIP voice transmissions. The ZyXEL Device creates Type of
Service priority tags with this priority to voice traffic that it transmits.
RTP TOS Priority
Setting
Enter the priority for RTP voice transmissions. The ZyXEL Device creates Type of
Service priority tags with this priority to RTP traffic that it transmits.