Installation guide

338 Planning and Installation Guide ShoreTel 14.2
Legacy Integration SMDI Protocol Support
18
Figure 60: ShoreTel Voice Mail with legacy PBX
Details
 Figure 60 shows a ShoreTel Voice Switch connected to a legacy PBX through several analog
trunks. These phone lines carry voice information from the PBX to the voice mail server. Signaling
information is carried out-of-band on the separate serial line, which is shown near the bottom of
the illustration.
 A ShoreTel voice mail server is connected through a serial cable to a PBX link device. The PBX
link device provides the basic SMDI services that were not included in some of the older legacy
PBX devices. This device must be purchased separately and configured per the manufacturer's
instructions.
 The ShoreTel server and PBX link exchange information. The PBX link sends call data to the
ShoreTel voice mail server, and the call data contains information related to the source and
destination of the phone call, and provides information about why the call is going to voice mail —
user did not answer, line was busy, and so on.
 The ShoreTel server, in return, sends MWI (Message Waiting Indicator) information that is used by
the legacy PBX to turn on the message-waiting mechanism on a user's phone to let her know she
has received a message.
Information Transferred via SMDI
The COM port is used to send call information between the ShoreTel system and the legacy voice mail
system. The SMDI protocol transmits the following call information from the ShoreTel system to the
legacy system:
 Message desk number: 1-999