Resolved -
Microsoft is now reporting that the issue affecting Teams users ability to toggle call queues has been resolved. Microsoft’s final posting is included below.
Issue ID: TM1226887 Affected services: Microsoft Teams Status: Service restored Issue type: Advisory Start time: Feb 4, 2026, 2:30 AM MST End time: Feb 4, 2026, 9:22 AM MST
User impact Users may have been unable to toggle call queues on or off in the Microsoft Teams web or desktop client.
More info As a workaround, users may have been able to use the Microsoft Teams mobile app to toggle call queues as expected.
Additionally, admins may have been unable to make changes to call queues, auto attendants, and holidays within the Microsoft Teams admin center.
Scope of impact Some users hosted in the North America region attempting to toggle call queues in the Microsoft Teams web or desktop client may have been impacted.
Additionally, admins making changes to call queues, auto attendants, and holidays in the Microsoft Teams admin center may also have been affected.
Root cause A code change contained within a recent service update was causing requests to be sent to an incorrect URL, resulting in impact.
Next steps - We're reviewing our update procedures to understand why impact to call queues wasn't caught during the testing phase. This will allow us to drive service improvements by proactively identifying similar issues in the future and improve our update testing processes.
Current status Feb 4, 2026, 10:08 AM MST We've reverted the offending service update and confirmed through monitoring service health telemetry that the impact has been remediated. This is the final update for the event.
* CallTower will be closing this master case and all associated cases.
Feb 4, 10:33 MST
Investigating -
Microsoft has reported issues with opting into Teams call queues. Microsoft has released an official service health alert for this issue (TM1226887), which is included below. Calltower has identified a workaround for the issue by toggling off the option "Call agents can opt out of taking calls" in the Teams Admin Center. Microsoft also reports that using the Teams application on mobile is a valid workaround.
Microsoft's Posting (TM1226887)
Issue ID: TM1226887 Affected services: Microsoft Teams Status: Service degradation Issue type: Advisory Start time: Feb 4, 2026, 9:10 AM MST
User impact Users may be unable to toggle call queues on or off in the Microsoft Teams web or desktop client.
More info As a workaround, users may be able to use the Microsoft Teams mobile app to toggle call queues as expected.
Scope of impact Some users hosted in the North America region attempting to toggle call queues in the Microsoft Teams web or desktop client may be impacted.
Root cause A code change contained within a recent service update is causing request to be sent to an incorrect URL, resulting in impact.
Current status Feb 4, 2026, 9:11 AM MST We've identified that a code change contained within a recent service update is causing requests to be sent to an incorrect URL, resulting in impact. We're reverting the offending service update as a potential remediation action, and anticipate this process will complete by our next scheduled communications update. Next update by: Wednesday, February 4, 2026 at 11:00 AM MST
*CallTower has opened a master case to investigate this issue as it has been reported by more than one CallTower customer. This issue may or may not directly affect your services and is currently under investigation. If you are affected, please report the issue to support@calltower.com. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise. This issue is being investigated as a top priority.
Feb 4, 09:27 MST
Completed -
The scheduled maintenance has been completed.
Jan 29, 19:30 MST
In progress -
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 29, 19:00 MST
Scheduled -
Purpose: Patching and preventative maintenance. Systems Affected:
CT Cloud SIP: -Remove Transcoding from IPAuth Adjacency ***CallTower will be disabling support for transcoding. Customers need to ensure that they support G.711, G.729, and/or RFC 2833.
Jan 29, 15:23 MST
Completed -
The scheduled maintenance has been completed.
Jan 26, 04:00 MST
In progress -
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 25, 22:00 MST
Scheduled -
CT Cloud Voice - January 2026 maintenance
Purpose: Renew APNS certs for AMS, EAS and Perimeta
Systems Affected: CT Cloud Voice
Impact: Users with CT Cloud Communicator for iOS will need to log back into the application
Outage: Yes
CT Cloud Communicator - Mandatory update to v3.21.60 Purpose: This version removes CT Cloud Meeting, which has been decommissioned (and no longer functions) 2. Security updates and bug fixes
Systems Affected: CT Cloud Voice
Impact: Users with CT Cloud Communicator will be forced to upgrade to v3.21.60.
Desktop users will be notified in-app if they are not already using v3.21.60 and forced to upgrade to v3.21.60 before they can continue using the app.
***Mac OS users: If CTCC hangs or freezes after update, follow these steps: 1. Uninstall the app from Applications 2. Open Finder and navigate to Go -> Go to folder -> type "~/Library/ApplicationSupport and press go. Remove anything with "CT Cloud" in the name. 3. Open Finder and navigate to Go -> Go to folder -> type "~/Library/Caches and press go. Remove anything with "CT Cloud" in the name. 4. Install CTCC 3.21.60 from CommPortal
Mobile users can check and update their current version in the respective app store on their phone. These users will be prompted and forced to upgrade to v3.21.60 before they can continue using the app.
Completed -
The scheduled maintenance has been completed.
Jan 24, 04:00 MST
In progress -
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 23, 22:00 MST
Scheduled -
Upgrade collaborate.ct450.com to V15.3.2
Purpose: Upgrade of collaborate.ct450.com which is 15.3 to 15.3.2 . According to Cisco there are bug fixes that are addressed
Systems Affected: *Cisco Jabber
Impact: Calltower will be upgrading the Edge servers for Jabber. Users will experience a connectivity loss with their Jabber Client/Services.
Outage: Yes
Regen CUPs Server Certs Clusters 00,02 and 10
Purpose: Calltower will be updating certificates for the CIsco CUPS servers for Jabber.
Systems Affected: *Cisco Jabber
Impact: Jabber Clients will receive a Certificate Warning. Please be aware that this is expected behavior and all users will need to accept this before signing back in.
Outage: No
HCS Server Certificate Renewal - Reboot
Purpose: Server Reboots of the HCS Cisco Unified Communications Manager will occur.
Systems Affected: *Cisco Call Manager - HCS
Impact: User phones will re-register to the next server in the Server list. Calls in progress 'should' remain up until the call has ended. Phone will most likely re register multiple times during the MW time. This is expected behavior.
Outage: No MasterFax & CT Cloud Fax - General Server Maintenance
Purpose: Monthly server maintenance: remove old/stuck faxes, reboot servers
Systems Affected: *MasterFax & CT Cloud Fax
Impact: Customers will experience interruptions to both MasterFax and CT Cloud Fax services during the Maintenance Window