PSTN Services Chapter 14: Legacy Integration
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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 the
following template:
14.6 PSTN Services
The number of trunks, your integration plan, and the overall system design includes the
provisioning of services across the network. PSTN services can be provided at both systems
in the integration or consolidated together on one system.
14.7 Multi-Site Integration
When the systems are located at different sites, both systems should have local trunking for
both inbound and outbound calls. Local inbound numbers make it easy for nearby
customers to reach you, while local outbound trunks allow you to save on telephone
charges by using local services at the site.
In this configuration, the trunk lines connecting the systems are used for the inter-site
calling between extensions or applications on the two systems. The interfaces on the two
systems are configured to dial out to the remote or off-system extensions, and to accept
incoming calls using DNIS.
The ShoreGear voice switch that connects to the legacy PBX should be located at the site
with the legacy PBX. This leverages the IP network to extend the calls to the other sites
with the ShoreTel 8 system.
14.8 Single Site Integration
When the systems are located at the same site, it is not required that both systems be
connected to the PSTN. The systems can be configured to best match your requirements.
In a single site configuration, the PSTN connections for inbound calls can be connected to
each system. In this environment, the trunks connecting the two systems are configured to
dial out the remote or off-system extensions and to accept incoming calls using DNIS.
Alternatively, inbound services can be consolidated on either the ShoreTel 8 system or the
legacy PBX. In this environment, calls to users on the other systems are forwarded to the
remote or off-system extensions through the trunk lines connecting the systems.
When all inbound trunks are consolidated on the ShoreTel 8 system, the trunks are
configured to support off-system extensions within the range of extensions on the other
PBX.
System One System Two
Location
DID Range
Local Extensions
(Prefix + Number)
Remote Extensions
(Prefix + Number)
Table 14-2 Dial Plan template
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