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IP Telephony Configuration Guide

Appendix A

Efficient Networking

This section provides information about making your network run more efficiently.

• “Determining the bandwidth requirements” on page 153

• “Network engineering” on page 154

• “Additional feature configuration” on page 159

• “Further network analysis” on page 162

• “Post-installation network measurements” on page 165

Determining the bandwidth requirements

The IP network design process starts with the an IP telephony bandwidth forecast. The bandwidth

forecast determines the following:

• LAN requirements: LAN must have enough capacity for the number of calls plus the overhead

• WAN requirements: WAN must have enough capacity for the number of calls plus the

overhead

Determining WAN link resources

For most installations, IP telephony traffic travels over WAN links within the intranet. WAN links

are the highest recurring expenses in the network and they are often the source of capacity

problems in the network. WAN links require time to receive financial approval, provision and

upgrade, especially inter-LATA (Local Access and Transport Area) and international links. For

these reasons, it is important to determine the state of WAN links in the intranet before installing

IP telephony.

Link utilization

This procedure explains how to determine and adjust link utilization:

1 Get a current topology map and link utilization report of the intranet. A visual inspection of the

topology can indicate the WAN links anticipated to deliver IP telephony traffic.

2 Record the current utilization of the links that will be handling IP telephony traffic. For

example, the link utilization can be an average of a week, a day, or one hour. To be consistent

with the considerations, get the peak utilization of the trunk.

3 Determine the available spare capacity. Business Communications Manager intranets are

subject to capacity planning controls that ensure that capacity use remains below a determined

utilization level.

For example, a planning control can state that the utilization of a 56 kbit/s link during the peak

hour must not exceed 50%. For a T1 link, the threshold is higher, at 85%. The carrying

capacity of the 56 kbit/s link can be 28 kbit/s, and for the T1, 1.3056 Mbit/s. In some

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Avaya IP Telephony Guía de configuración Pagina 153