# Message Waiting Types

The mailbox message waiting type tells the system what equipment, if any, is available to notify a mailbox owner of unplayed messages.

Note: The MITEL SX-200 DIGITAL PABX and SX-2000 PABX use message waiting types 0, 3, 5, and 7 only.

## Default Message Waiting Types

MWI Type | Description
0: None | No message notification is available.
1: Not available | The mailbox does not have any message notification capabilities.
3: DTMF-to-PBX | The system sends DTMF signals over the telephone lines to control PBX message waiting indicators. This method is compatible only with certain PBXs. For this protocol to be used, the technician must program codes to control lights and to configure a line group with at least one port dedicated as a message lights outdialer.
5: Pager | This message waiting type is used to activate a radio pager, or to provide message delivery, when a message is left in a mailbox. The Pager application must be configured for the system to support pagers and/or message delivery. Mailbox programming for this message waiting type is complex. Refer to Pagers and Message Delivery, for information on adding a pager or programming message delivery for a mailbox.
7: Program RS232 | Allows servers to turn PBX message waiting indicators on and off by sending signals to the PBX over RS-232 data links. The data links connect to modems that are connected to analog ports on the PBX.
11: Centrex | Allows servers to turn PBX message waiting indicators on and off by sending signals to the PBX over RS-232 data links. The data link is a direct serial connection to the PBX.
16: HIS PMS | Optional RS-232 message waiting system for PMS
17: Unified Integrations | Outgoing MWI programming for mailboxes with mappings from several extensions. See ESMDI in the NuPoint UM Optional Integrations Guide for more information.
28: MiTAI Messaging | MiTAI MWI uses proprietary MiTAI messaging to communicate directly with the MiVoice Business ICP to activate message waiting indicators on designated phones.