302 Planning and Installation Guide ShoreTel 14
Legacy Integration Coordinated Dialing
Coordinated Dialing
Coordinated dialing allows users to dial between the systems using extension-to-extension dialing as
well as enabling consolidation of inbound and outbound services. To effectively plan the integration,
consider the following items:
Expected call traffic between the two systems to provide sufficient trunking
Current numbers of extensions and extension lengths at both systems
Service plans to determine which PSTN services are provided at each voice system
What type of legacy PBX equipment is integrated with the ShoreTel system
Trunk Requirements
The number of digital trunks required between the ShoreTel system and the legacy PBX depends on
the expected traffic between the two systems. To determine the number of trunks, you need to
estimate the number of calls per hour that are placed between the two systems. When estimating the
call volume between the two systems, consider the following:
The volume of direct calls between users on the two systems
Traffic related to Automated Call Distributor (ADC) calls
Outbound call volume (i.e. when outbound trunking to the PSTN is provided by one of the systems
for all users, such as a PSTN trunk connected to the legacy PBX that provides long distance
services for users on both the legacy and ShoreTel system)
Inbound call volume (i.e. when inbound services are provided by one system to all users)
Additionally, you can rely on the estimated calls-per-hour number to determine the number of trunks to
configure between the two systems.
For more information on trunk requirements, see Trunk Planning and Ordering on page 85.
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