ZyXEL Communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNLI - Manual (Page 177)

P-2602HWNLI User’s Guide
Chapter 11 Voice 177
11.10 Quality of Service (QoS)
Quality of Service (QoS) refers to both a network's ability to deliver data with minimum delay,
and the networking methods used to provide bandwidth for real-time multimedia applications.
11.10.1 Type Of Service (ToS)
Network traffic can be classified by setting the ToS (Type Of Service) values at the data source
(for example, at the ZyXEL Device) so a server can decide the best method of delivery, that is
the least cost, fastest route and so on.
11.10.2 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.
11.10.3 SIP QoS Screen
Use this screen to maintain ToS and VLAN settings for the ZyXEL Device. To access this
screen, click VoIP > SIP > QoS.
Note: You only need to configure this screen if your VoIP service provider or network
administrator gave you ToS or VLAN settings.