Installation guide

Coordinated Dialing Plan Legacy Integration
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ShoreTel 14.2 Planning and Installation Guide 333
Coordinated Dialing Plan
With legacy integration, users on both systems can dial one another using abbreviated or extension
dialing. This includes dialing from applications on the systems, such as the ShoreTel voice mail
application, and would also include forwarding a call to an assistant at an extension on the legacy
PBX. To determine the coordinated dialing plan configuration, you must identify the current numbering
of users on both systems:
 When the systems are located together, extensions can normally be assigned from a single
numbering plan, or from a single DID number range provided by the local carrier. In this case, the
extensions on the two systems are assigned such that there is no overlap using the desired
extension length.
 When systems are at different locations, each system’s numbering plan is often based on the DID
range supplied by the local telephone company. In this case, overlap of the extension ranges can
occur at the currently used extension length.
For example, consider the following situation:
 One location is assigned DID range 408-555-2000 through 2999
 The second location is assigned range 650-333-2500 through 2799
 The systems currently use four-digit dialing matching the trailing 4 digits of the DID numbers.
In this case, there are users on both systems currently assigned extension 2500. To provide a
coordinated dialing plan across the systems, the extensions must be adjusted to make them unique
system-wide. In the integration, four-digit extensions that overlap are made unique by increasing the
extension length across the system. When the extension length is increased, the first digit becomes
the “system” number and the remaining digits are the “extension.” In the above example, the extension
length would be increased to five-digit dialing, and at the first location would be extensions 52000
through 52999, while users at the second location would be assigned extensions 32500 through
32799.
The extensions on all systems that are integrated together should be configured to be the same length.
Be sure to document the planned integrated dialing plan prior to configuring the systems to streamline
the configuration process. Information to take note of is provided in Table 72.
Table 72: Dial Plan template
System One System Two
Location
DID Range
Local Extensions
(Prefix + Number)
Remote Extensions
(Prefix + Number)