
P-2602H(W)(L)-DxA Series User’s Guide
Table 55 VoIP > SIP Settings > Advanced
LABEL | DESCRIPTION |
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Back | Click this to return to the SIP Settings screen without saving your changes. |
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Apply | Click this to save your changes and to apply them to the ZyXEL Device. |
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Cancel | Click this to set every field in this screen to its |
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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
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 DiffServ
DiffServ is a class of service (CoS) model that marks packets so that they receive specific per- hop treatment at
11.10.2.1 DSCP and Per-Hop Behavior
DiffServ defines a new DS (Differentiated Services) field to replace the Type of Service (TOS) field in the IP header. The DS field contains a
DSCP is backward compatible with the three precedence bits in the ToS octet so that non- DiffServ compliant,
Figure 89 DiffServ: Differentiated Service Field
DSCP
Unused
1.The ZyXEL Device does not support DiffServ at the time of writing.
162 | Chapter 11 Voice |