When a message for a user arrives, the MWI turns on for the phone, but it only works sometimes. This issue started recently and it's been happening to multiple users. I resync All MWIs on the phone system but it didn't fix the issue. Any thoughts?
I reran synchronize MWI on All Phone systems and it works but sometimes when I leave a test message it doesn't always enable the MWI on my phone and others as well. I was thinking creating a task schedule to synchronize every 30 mins or an hour but wouldn't fix my first issue :(
Likely as simple as the Primary Extension of the mailbox (assuming you haven’t customized the MWI destination of a mailbox) is no longer matching the Directory Number properly, especially if an mwi resume doesn’t straighten things out. Examine the incoming CSS of your SIP Trunk from CUC using Dialed Number Analyzier or manually. The CUCM SDI/SDL traces would also show which destination was matched by Digit Analysis.
Also verify that the SIP Trunk Security Profile allows unsolicited notify. This is less likely though since it’s not 100% broken. M
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