For Message Waiting Indication (MWI) to function correctly in a SIP integration between Cisco Unity Connection and Cisco Unified Communications Manager (CUCM), Unity Connection sends unsolicited SIP NOTIFY messages to CUCM. These messages contain the MWI status for a user's extension. The SIP Trunk Security Profile on CUCM must be configured to "Accept unsolicited notification." This setting explicitly allows the CUCM SIP trunk to receive and process these NOTIFY messages that are not part of a pre-established subscription dialog, enabling the MWI light on the user's phone to be turned on or off.

A. Accept out-of-dialog refer: This setting is required for call transfer scenarios using the SIP REFER method, not for MWI notifications.
B. Accept replaces header: This option is used for features that replace an existing call dialog, such as attended transfer or call pickup, and is unrelated to MWI.
D. Accept presence subscription: This setting allows the trunk to accept SUBSCRIBE requests for presence information, which is a separate mechanism from unsolicited MWI updates.

1. Cisco Unified Communications Manager Administration Guide

Release 12.5(1)SU1

"SIP Trunk Security Profile Configuration

" Field Descriptions for SIP Trunk Security Profile.

Reference: In the table describing the configuration fields

the entry for "Accept Unsolicited Notification" states: "Check this check box to allow Cisco Unified Communications Manager to accept an unsolicited NOTIFY from the far-end. For example

this may be used for MWI."

2. Integration Guide for Cisco Unity Connection with Cisco Unified Communications Manager

Release 12.x

Chapter: "Setting Up a Cisco Unified CM SIP Trunk Integration

" Section: "Task List for Creating a SIP Trunk Integration."

Reference: In the procedure "To Create a SIP Trunk Security Profile for the Integration

" Step 7 explicitly instructs: "Check the Accept Unsolicited Notification check box. This setting is required for message waiting indicators (MWIs) to work correctly."

3. Cisco Unified Communications Manager System Guide

Release 12.5(1)SU1

Chapter: "Message Waiting

" Section: "Message Waiting and SIP Trunks."

Reference: This section explains the MWI mechanism over SIP trunks

stating

"Cisco Unified Communications Manager supports unsolicited NOTIFY for MWI... To enable this feature

you must check the Accept Unsolicited Notification check box in the SIP Trunk Security Profile that is associated with the SIP trunk."