# Configure Programmable RS-232 MWI

The programmable RS-232 MWI interface is configured entirely offline, through the External Applications menu. This procedure assumes that the appropriate server hardware and software have been installed.

Perform the following steps to configure the programmable RS-232 message waiting indicators interface in a server:

1. Complete an RS-232 Message Waiting Indicators Interface Worksheet.

2. Create the interface string. See Creating a Programmable RS-232 Interface String. This procedure includes instructions for:

   - setting delay times

   - enabling indicator-on requests for successive messages

   - sending the number of unplayed messages

   - compensating for different directory and mailbox numbers

3. Assign message waiting type 7 (programmable interface) through the first or second message waiting type prompt in mailboxes that are to receive message waiting indicator requests. See Assigning Message Waiting Indicators to a Mailbox.

4. Use the Lights Test (Text console) described in the DTMF-to-PBX section to test RS-232 configuration. The modem will go off hook and dial the message waiting code to light the MWI lamp on the telephone set.