Microsoft 365 Alert – Service Degradation –  Microsoft Teams – Users’ SIP devices are unable to register and utilize Microsoft Teams PSTN calls – RESOLVED

30/10/2024 10:46:00 AM

NHSmail Reference: INC46583299

Microsoft Reference: TM921406

Issue Status: RESOLVED

Issue Description: Session Initiation Protocol (SIP) devices cannot register, make or receive Microsoft Teams calls

Current Update: 30/10/2024 10:46:00 AM Microsoft have successfully reverted the offending change and confirmed that the issue is now resolved.

Scope of impact: Organization is affected by this event and any user using a SIP device is impacted.

Root cause: A new configuration change intended to introduce a new service feature inadvertently caused impact.

Next steps: Microsoft are reviewing their standard service and feature update procedures to prevent this issue from happening again.

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