IP Trunk3.01 (and later) traffic engineering 95
on the corporate intranet. This is described in "IP Trunk 3.01 (and later)
traffic engineering" (page 95).
2. Assess WAN link resources. If resources in the corporate intranet
are not sufficient to adequately support voice services, the cause is
usually insufficient WAN resources. "Assess WAN link resources" (page
121) outlines how this assessment can be made.
3. Measure the existing intranet’s Quality of Service (QoS). Estimate the
quality of voice service the corporate intranet can deliver. "Measure
intranet QoS" (page 139) describes how to measure prevailing delay
and error characteristics of an intranet.
After the assessment phase, the IP Trunk3.01 (and later) network can be
designed and implemented. This design not only involves the IP Trunk
3.01 (and later) elements, but can also require making design changes to
the existing customer intranet. "Fine-tune network QoS" (page 132) and
"Implement QoS in IP networks" (page 126) provide guidelines for making
modifications to the intranet.
IP Trunk 3.01 (and later) traffic engineering
Todesign a network is to size the network so that it can accept a calculated
amount of traffic. The purpose of the IP Trunk3.01 (and later) network is
to deliver voice traffic that meets QoS objectives. Since traffic determines
network design, the design process must start with obtaining an offered IP
Trunk3.01 (and later) traffic forecast. The traffic forecast drives drive the
following:
•IP Trunk3.01 (and later) hardware requirements
•WAN requirements
•TLAN subnet requirements
Trafficforecasting is a process that often requires several tries to achieve
satisfactory results. For example, a WAN might not have enough bandwidth
to support all the IP trunks required; therefore the codec choice or the
number of trunks provisioned must be adjusted.

Estimate voice traffic calculations

Follow the steps in Procedure 4 "Estimating voice traffic" (page 95) to
calculate an estimate of voice traffic.
Procedure 4
Estimating voice traffic
Step Action
1Calculate Voice on IP traffic.
Nortel Communication Server 1000
IP TrunkFundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
Copyright© 2007, Nor tel Networks
.