Microsoft Teams Service Alert – Users with Survivable Branch Appliance configured can’t establish offline Public Switched Telephone Network (PSTN) calls – ONGOING

26-07-2021 06:22:04 PM (BST)

Issue Reported: 26/07/2021 05:21:00 PM

Microsoft Reference : TM273241

Issue Status: ONGOING

Issue Description: Users with Survivable Branch Appliance (SBA) can’t use offline Public Switched Telephone Network (PSTN) calling.

Scope of impact: This issue may impact any of your Microsoft Teams version 1.4.00.18819 users that are in offline mode and attempting to place or receive PSTN calls with SBA configured.

Current Update – 26/07/2021 06:20:00 PM: Microsoft has determined that a recent service update is preventing users with SBA configured from placing or receiving PSTN calls in offline mode. Microsoft are further reviewing the offending service update to identify why the update is causing the problem, and to determine our steps for remediating impact.

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