Specifications

Planning and System Design
Planning and Installation Guide 3 – 5
Figure 3-1 Telephone and Trunk Planning Spreadsheet (Microsoft Excel)
Trunk Requirements
Trunks provide connectivity between users on the ShoreTel 6.1 system and the public
switched telephone network (PSTN). In this next task in the system design process,
you determine the number of trunks required.
The number of trunks required on your system varies, depending on the number of
users and your specific application needs. It is important to size your trunking
correctly because not having enough trunks can lead to blocked calls when all trunks
are busy, and too many trunks can lead to wasted money on monthly access charges.
See Chapter 5, “Trunk Planning and Ordering,” for more information about trunk
features, ordering, and installation.
You have several options for determining the number of trunks your site requires:
Option 1 Review the number of trunks on your current system. In general, this is
one of the best methods to gauge the number of trunks you need.
Option 2 You can also request a traffic analysis from your service provider,
interconnect, or telecom manager to understand your current trunk
utilization. This method will help you understand your current usage
and allow you to maintain the current service level.
Option 3 Visit a web site, such as www.erlang.com, to use a traffic calculator for
determining your trunk requirements.