Installation guide

Dialing Plan Considerations International Planning and Installation
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ShoreTel 14.2 Planning and Installation Guide 373
Dialing Plan Considerations
When planning a global voice network, remember that the ShoreTel system is a single image system
and that you must consider all countries and locations when designing the international dialing plan.
The ShoreTel system can match the dialing plan requirements of the local service provider for the
supported countries.
Single-Extension Plan
Across the global voice network, all extensions must be unique and cannot overlap.
Trunk Access Codes
Across the global voice network, when you configure trunk access codes, that portion of the dialing
plan will be reserved so you will be sacrificing one digit. Typically in the US, customers use 9 as a trunk
access code. Internationally, those in the EMEA, for instance, often use 0 as a trunk access code. The
following are some things to consider when you create a trunk access code:
 Using two different trunk access codes will limit users to only being able to access certain trunk
groups.
 If you use a single trunk access code, some users will need to be retrained.
 Alternatively, 8 could be defined for the trunk access code globally.
ShoreTel recommends proper identification from the beginning. The trunk access code should not be
changed later.
Operator Digit
The leading digit of 0 is typically reserved for dialing the operator in the US. The operator digit is
configurable. Similarly, EMEA customers are accustomed to dialing 9 to reach the operator.
ShoreTel recommends choosing a single digit for the trunk access code and selecting a different single
digit for the operator.
Emergency Numbers
The ShoreTel system allows dialing of emergency numbers with and without trunk access codes. For
this reason, you should architect the dialing plan for this feature.
 911 is used in the US.
 112 is used in Europe and other countries.
 Check for other countries and regions for local requirements.
Thus, extensions should not begin with 0, 1, or 9 to make use of this feature.