Voicemail Messages Aren't Delivered in Teams or Skype for Business Client

Publisher

Microsoft

URL

https://learn.microsoft.com/en-us/troubleshoot/microsoftteams/phone-system/voicemails-not-delivered

Published

2025-04-01

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Microsoft Learn terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• Exchange mail flow (transport) rules are a documented cause of undelivered voicemail, for example rules that mark messages with MP3 attachments as spam or act on SPF failures; voicemail with SPF failures still reaches Exchange but such rules can keep it out of the mailbox. in context
• Teams shows a voicemail only if the message class is IPM.Note.Microsoft.Voicemail.UM; for Exchange on-premises, connectors must be set up so SMTP delivery does not strip the item class. in context
• The troubleshooting article says Teams users with on-premises Exchange mailboxes receive voicemail in Outlook but cannot view or play those voicemails in the Teams client. disputed in context
• If Exchange Online OpenDomainRoutingEnabled is True, voicemail Content-Class changes from Voice-CA to unauthenticatedVoice-CA and Teams cannot recognise the messages as voicemail; the fix is a Microsoft Support request to set it to False. in context
• If voicemail appears in Outlook but not in Teams, Microsoft directs admins to run the Teams Voicemail test in Microsoft Remote Connectivity Analyzer and check for blocking Exchange Client Access Rules, EWS access policies, and mail flow rules or third-party filters that alter headers. in context
• The troubleshooting article says voicemail protected by Rights Management Services is viewable in Outlook but can be played only in Outlook on the web (OWA), with transcriptions readable in Outlook or OWA. disputed in context
• The documented workaround for undelivered voicemail is to add the Teams cloud service IP addresses to an SPF record, or create a transport rule that bypasses spam filtering for Cloud Voicemail from those addresses. in context

Cite this source record

APA

WarmTransfer. (2025, April 1). Voicemail Messages Aren't Delivered in Teams or Skype for Business Client. WarmTransfer. https://warmtransfer.net/knowledge/sources/ms-learn-troubleshoot-voicemails-not-delivered

BibTeX

@misc{warmtransfer-ms-learn-troubleshoot-voicemails-not-delivered,
  title  = {Voicemail Messages Aren't Delivered in Teams or Skype for Business Client},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/ms-learn-troubleshoot-voicemails-not-delivered},
  note   = {Microsoft, accessed 2026-09-25}
}