User guide

User Guide for PBXLink DMI4
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using a multiple DMI4s with inband signaling, there is no need to chain the boxes together.
To install one or more additional DMI4s, follow the following steps. When installing more than one DMI4
into a new system, first install one DMI4 as explained in Chapter 2 to verify that the voicemail system is
working, and then install the additional DMI4s.
1. Connect the first DMI4 SMDI Port to the PC’s COM port using a standard RS-232 modem cable. The
SMDI Port is a 25-pin D-type connector so you will need to use a 9-pin to 25-pin cable or 25-pin to 25-
pin cable depending on which size of connector your PC has.
2. Connect the second DMI4 SMDI port to the first DMI4’s Management Port using a standard RS-232
modem cable. The Management Port is a 9-pin D-type connector so you will need a 9-pin to 25-pin
cable.
3. Repeat step 2 for each additional DMI4, connecting the SMDI Port of the next DMI4 to the
Management Port of the previous one.
4. Leave the Management Port of the last DMI4 unconnected.
Programming the PBX for Multiple DMI4s
The only additional PBX programming required for multiple DMI4s beyond what is required for a single
DMI4, is that the hunt group or station-to-station hunting must be increased to include the extra ports.
Message Waiting Indicators
When there is a single DMI4 installed in the system, the last port (port 4) of the DMI4 processes requests
from the voicemail system to set and clear Message Waiting Indicators (MWIs). When you have multiple
DMI4s in the system, it is the last port of the last DMI4 that sets the MWIs. This can be modified by setting
the MWI Ports parameter under the SMDI configuration menu as explained in the section entitled
Parameters Explained beginning on page 32. This parameter affects the last DMI4 in the chain only, so
changing this parameter allows any of the ports on the last DMI4 to control MWIs.
With a Norstar PBX, each DMI4 independently maintains a table of all the extension numbers and names in
the system. Port 1 of each DMI4 discovers all the extension numbers in the system, and the port specified by
the MWI Ports parameter then finds out the names. Thus normally both port 1 and port 4 of each DMI4
must be connected to the PBX when a Norstar PBX is used.