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Outage in Webex by Cisco

Webex Calling: On-Prem CUCM customers may experience call failures

Resolved Minor
June 22, 2026 - Started 29 days ago - Lasted 4 days

Incident Report

Summary AI Generated

Webex Calling experienced an 84-hour outage affecting on-premises CUCM customers running app version 46.6 with FIPS enabled, causing call failures for both commercial and government users. The root cause was tied to the 46.6 app build, and resolution required developing, validating, and rolling out a fixed version across Windows, Mac, Android, and iOS platforms in phases. Service was fully restored on June 26, with affected users advised to upgrade to the latest Webex app version.

Engineering is investigating an issue that may cause a subset of Webex Calling on-prem users to experience call failures. This is impacting Webex for Government and commercial users. Impact is limited to the following scenario (all must apply) - 1. Customer has 46.6 (either downloaded manually or via upgrade). AND 2. Customer has FIPS enabled AND 3. Customer uses CUCM for calling We are working to restore the service and apologize for any inconvenience this may cause.

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Latest Updates ( sorted recent to last )
MONITORING 26 days ago - at 06/26/2026 05:21AM

Engineering has completed remediation activities, and services are now restored. If you continue to experience the issue, please upgrade your Webex application to the latest version.

We will continue to monitor to ensure service stability.

IDENTIFIED 26 days ago - at 06/26/2026 04:59AM

The updated mobile build reviews have successfully concluded. The fixed Webex App is now rolling out in phases for all platforms - Android, iOS, Mac, and Windows. Please keep an eye out for update notifications within the app.

Windows and Mac users can access the updated app here: https://help.webex.com/en-us/article/nw5p67g/Webex-App-%7C-Installation-and-automatic-upgrade#Cisco_Reference.dita_7f297b3d-e764-4f24-af5b-4cd41da90668

IDENTIFIED 27 days ago - at 06/25/2026 05:00PM

The fix for this issue has been released to general availability for Webex App desktop clients (Windows, Mac, and Android), restoring CUCM calling for affected FIPS-enabled users. Updated mobile builds have been submitted for review and will become available shortly. We will provide the next update within 24 hours, or sooner if new information becomes available.

Thank you for your continued patience.

IDENTIFIED 28 days ago - at 06/24/2026 04:59PM

We have developed a fix for the current service issue, which is now undergoing final validation to ensure system stability. We are committed to restoring full performance as quickly as possible and will initiate the production deployment once testing is complete. We will provide another update within 24 hours, or sooner if new information becomes available.

We appreciate your patience while we address this service incident.

IDENTIFIED 29 days ago - at 06/23/2026 05:02PM

Our engineering team is actively finalizing the validation of the fix to restore service, with full completion expected by tomorrow, June 24. Following successful validation, we will release the updated Webex App build. We are committed to keeping you informed and will provide the next update in 24 hours or as soon as new information becomes available.

Thank you for your continued patience as we address this service incident.

IDENTIFIED 29 days ago - at 06/23/2026 01:10PM

Our engineering team is actively finalizing the validation of the fix to restore service, with full completion expected by tomorrow, June 24. Following successful validation, we will release the updated Webex App build. We are committed to keeping you informed and will continue to provide status updates every four hours.

Thank you for your continued patience as we address this service incident.

IDENTIFIED 29 days ago - at 06/23/2026 08:32AM

This issue persists, and Engineering continues to work toward further remediation.

We will continue to provide updates as they become available.

MONITORING 29 days ago - at 06/23/2026 07:29AM

Engineering has completed remediation activities and services are now restored.

We will continue to monitor to ensure service stability.

IDENTIFIED 29 days ago - at 06/23/2026 03:10AM

Engineering is making progress on restoring the service and is planning to deploy a fix shortly. We will provide the next update on our progress in four hours.

IDENTIFIED 29 days ago - at 06/23/2026 01:59AM

Our engineers are still investigating the incident. We will provide the next update in one hour.

IDENTIFIED 29 days ago - at 06/23/2026 12:25AM

Engineering has identified the issue and is currently working towards service restoration. We will continue to provide updates as they become available.

Thank you for your continued patience as we address this service incident.

INVESTIGATING 29 days ago - at 06/23/2026 12:14AM

Engineering is investigating an issue that may cause a subset of Webex Calling on-prem users to experience call failures. This is impacting Webex for Government and commercial users.

Impact is limited to the following scenario (all must apply) -
1. Customer has 46.6 (either downloaded manually or via upgrade). AND
2. Customer has FIPS enabled AND
3. Customer uses CUCM for calling

We are working to restore the service and apologize for any inconvenience this may cause.

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