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336 Planning and Installation Guide ShoreTel 14.2
Legacy Integration SMDI Protocol Support
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Assign each system a System ID to identify the remote site location
For more information on AMIS systems, see the ShoreTel System Administration Guide.
SMDI Protocol Support
The ShoreTel product supports the SMDI protocol, enabling seamless integration of ShoreTel
equipment with legacy phone systems and enabling a smooth migration toward an all-IP telephony
solution.
A Little History
The SMDI protocol evolved at a time when voice mail services and PBX services were provided by
separate physical devices. Over the years, manufacturers have managed to offer both PBX and voice
mail services within a single device, and the need for SMDI has diminished. However, the protocol can
still be useful in situations where newer equipment will be integrated into a network of older devices.
How It Works
SMDI enables the separate devices that provide PBX and voice mail services to share information
over an out-of-band serial cable connection. The PBX shares information with the voice mail system
about incoming calls. The following information is passed to the voice mail system:
Who the call is from
Where the call is going (i.e. user extension)
The reason the call is going to voice mail instead of being answered
In response, the voice mail system returns a notification to the PBX that a message was left on the
voice mail server. The PBX system then uses this information to alert the user by turning on the
message waiting light on his or her phone.
Configurations of integrated equipment
With SMDI support, there are essentially two possible ways the ShoreTel and legacy equipment can
be configured:
External Voice Mail Configuration — The legacy system provides voice mail services while the
ShoreTel system acts as the PBX.
ShoreTel Voice Mail Configuration — The ShoreTel system provides voice mail services while the
legacy system acts as the PBX.
Additional details
A group of analog trunks from the ShoreTel system is used to access the legacy voice mail system.
The ShoreTel system is on the extension side of the trunks. The ShoreTel voice mail application
manages the group of outgoing extensions. The ShoreTel server can provide digit translations if the
legacy voice mail and ShoreTel system have different extension lengths.