Forum Discussion
Voicemail not being delivered from Phone System to Exchange 2013
An update! A new requirement to run the Exchange Hybrid Configuration Wizard has been added to the list of configuration steps for https://docs.microsoft.com/en-ca/microsoftteams/set-up-phone-system-voicemail#phone-system-with-on-premises-environments. We can't actually test this out until the new year but according to the Office 365 support engineer we've been working with, this should resolve the issues we've been seeing.
It sure would have been nice if Microsoft had given some advance notice of this breaking change and had updated their documentation before it took effect, rather than eight weeks later, but I guess you can't have everything.
We have been experiencing this same exact issue but with a completely cloud hosted PBX through Microsoft Teams. Suddenly, a particular users VM's are able to be left, but do not show up in the S4B, Teams or Desktop Polycom Phone at all. I haven't seen the transport rule(s) you mention so maybe this is an expansion of the issue in the cloud.
Do the voicemail messages show up in their Outlook inbox, or do they just not show up at all? If they're not showing up at all, try running a message trace from the https://protection.office.com/?rfr=AdminCenter#/messagetrace to see if delivery is failing there.
If they are showing up in the mailbox but not in the SfB app, download the https://github.com/stephenegriffin/mfcmapi/releases/latest and run it on the affected user's computer. Go to Quick Start > Open folder > Inbox, click on one of the voicemail messages in the list, then check the PR_MESSAGE_CLASS property in the lower pane. It should be "IPM.Note.Microsoft.Voicemail.UM.CA".
If the message class is "IPM.Note", it won't show up as a voicemail in SfB. You'll have to work out what is causing this to get changed. Perhaps a third-party mail filter? It's a bit mysterious to me how the PR_MESSAGE_CLASS property is actually meant to be set now that messages are delivered over SMTP rather than through EWS.
