Chapter 15: Legacy Integration Planning and Installation Guide
ShoreTel 11.1 205
When all inbound trunks are configured on the legacy PBX, the trunks on the ShoreTel
system are configured to support inbound services with call routing to the extensions on
the ShoreTel system.
When DID numbers are already in place on one of the PBX’s which will be connected,
ShoreTel recommends that the inbound DID service not be moved or split between the
systems but configured to remain on the system where they are currently configured and
have calls to users on the other system forward across the connecting trunks.
In the single site configuration, ShoreTel recommends that services for outbound calls be
connected to the legacy PBX. In this configuration the trunk interfaces on the s system are
configured to support outbound local and long distance dialing while the interface on the
PBX is configured to route the received outbound calls.
15.9 Consolidated Long Distance
Long distance calls can be consolidated into a single PSTN interface across both the
ShoreTel system and the integrated legacy PBX. In this configuration, you gain the benefits
of reduced long distance rates by consolidating all your enterprise's long distance calls into
a single carrier. When it is required, the outbound long distance trunks are connected to
the legacy PBX and the ShoreTel system is configured to route long distance calls outbound
across the digital trunk connecting the systems.
15.10 Voice Mail Integration
The primary issue with voice mail integration is they are often proprietary and the
interfaces defined to connect the same and disparate systems are very old, complex and
difficult to implement. In fact, many voice systems from the same vendor are not
connected. The interface with which most customers are familiar is AMIS. This is an analog
interface that has been around for a long time, but is a real challenge to implement and can
be very expensive from legacy voice mail providers. It is not uncommon to pay $10,000 per
site for this capability. Another widely-used interface, Simplified Message Desk Interface
(SMDI), was developed in the days when the PBX and voice mail systems were separate
systems. It operates on a serial link between a PBX and voice mail system and allows them
to work together. ShoreTel supports both AMIS and SMDI protocols for voice mail
15.10.1AMIS Protocol Support
The ShoreTel system sends and receives voice mail messages to and from legacy voice mail
systems using AMIS protocol Version 1 - Specification February 1992. To send voice mail
messages to remote AMIS sites, ShoreTel dials the access phone number for the remote
system. Likewise, to receive voice messages from a remote system, the remote system must
know the number to dial into the ShoreTel system. To reach the ShoreTel system, the
remote system must be configured to dial any number that reaches an auto-attendant
AMIS call support is enabled by default. Incoming AMIS voice mail is delivered in the same
manner as other voice mail; however, users cannot send replies. To send outbound AMIS
voice mail, you must define AMIS System profiles in ShoreWare Director.
ShoreTel negotiates the setup, handshaking, and teardown of AMIS system calls. Each voice
mail requires a call over the trunk group defined for the AMIS delivery and call-back
To simplify AMIS systems and increase usability:
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