ZyXEL Communications P-324 User's Guide download pdf (Page 177)

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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.

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