Installation guide

Configuring an Outbound Call Routing via the Remote PBX Legacy Integration
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ShoreTel 14.2 Planning and Installation Guide 357
6. As needed, configure the local prefixes and pre-pend digits to match the tie trunk and the required
dialing for the PSTN connection to your legacy PBX.
For additional information on trunk configuration and information on configuration options, refer to
the ShoreTel System Administration Guide.