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153

IP Telephony Configuration Guide

Appendix E

Quality of Service

The users of corporate voice and data services expect these services to meet a level of quality of

service (QoS). This, in turn, affects network design. The purpose of planning is to design and

allocate enough resources in the network to meet user needs. QoS metrics or parameters help in

meeting the needs required by the user of the service.

This section provides information about:

• “Setting QoS” on page 153

• “Measuring Intranet QoS” on page 155

• “Implementing QoS in IP networks” on page 159

• “Network Quality of Service” on page 161

Setting QoS

There are two interfaces that must be considered when you set up QoS on the network, as shown in

the figure below:

• IP telephony interfaces with the end users: voice services made available need to meet user

QoS objectives.

• The gateways interface with the intranet: the service provided by the intranet is “best-effort

delivery of IP packets,” not guaranteed QoS for real-time voice transport. IP telephony

translates the QoS objectives set by the end users into IP adjusted QoS objectives. The

guidelines call these objectives the intranet QoS objectives.

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Avaya IP Telephony Guia de Configuração Página 153