Chapter 3: Planning and System Design Determine System Topology
ShoreTel 8 Planning and Installation Guide 41
help you understand your current usage and allow you to maintain the current
service level.
Visit a web site, such as, to use a traffic calculator for determining
your trunk requirements.
Fill in the Trunks section of the spreadsheet shown in Figure 3-1 to determine the
number of trunks you need. The spreadsheet automatically calculates the trunking
Consider Table 3-2 and the following:
Larger locations can typically use lower-density trunking (15%).
Smaller locations need higher-density trunking (50%).
Some applications, such as call centers, can demand higher-density trunking
When planning trunks, consider the call volume for your workgroups or ACD groups.
Since there is generally a queuing solution in place for ACD calls, the number of trunks
required should be based on the full utilization of the expected number of agents and
sufficient trunks for the expected number of waiting callers.
Figure 3-1 Telephone and Trunk Planning Spreadsheet (Microsoft Excel)
Trunk Density Trunks/Users %
Low 15%
Average 30%
High 50%
Table 3-2 Trunk Density
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