Avaya BCM 2.0 IP Telephony Manual de usuario descargar pdf (Pagina 16)

16 Engineering guidelines

Enterprise Edge 2.0 IP Telephony Configuration Guide P0911590 Issue 02

Correct design procedures and rules are a must if a corporate network is expected

to deliver voice traffic. The intranet introduces limits, delay, delay variation, and

error, at levels that are higher than those delivered by voice networks. Delay

between a user talking and a listener reduces the performance of conversations,

while delay variation and packet errors introduce glitches in conversation. The

connection of the IP gateways to the corporate intranet without preliminary

evaluation can result in not acceptable degradation in the voice service.

A good design of the network begins with an understanding of traffic, and the

network that carries the traffic. There are three preliminary steps where the installer

must begin:

• Determine bandwidth requirements. The installer must determine the amount of

traffic that the Enterprise Edge product will route through the IP gateway. This

in turn places a traffic load on the corporate intranet. To determine bandwidth

requirements, refer to the Enterprise Edge VoIP Gateway bandwidth

engineering section on page 17.

• Determine WAN link resources. If there are not enough resources in the

corporate intranet to support voice services, the problem is normally because of

not enough WAN resources. To determine WAN resources, refer to the

Determining WAN link resources section on page 23.

• Measure the existing intranet’s QoS. The installer must determine the quality of

voice service the corporate intranet can deliver. The Measuring Intranet QoS

section on page 27 describes how to measure the delay and error characteristics

of an intranet.

After the examination phase, the installer designs and installs the IP telephony

network. This design not only includes the IP telephony but can also include

making design changes to the intranet.

• The Further network analysis section on page 31 provide guidelines for

modifying the intranet.

• The Implementing the network section on page 36 provides guidelines for

integrating the IP gateway into the corporate LAN.

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Avaya BCM 2.0 IP Telephony Manual de usuario Pagina 16