Outage in Cisco Duo
Duo Phone Call Authentication Failure for US Based Carriers
Resolved MinorIncident Report
Summary AI Generated
Cisco Duo experienced VOIP authentication failures affecting all US region deployments for 3.3 hours. Users were unable to authenticate via phone calls and were advised to use alternative methods like Duo Mobile Push or SMS passcodes. The service was restored to normal operation with sustained success rates observed.
We are currently investigating an issue causing VOIP authentication failures in all the deployments in the US region and are working to correct the issue as soon as possible. At this time please use alternative authentication methods such as Duo Mobile Push, or SMS passcodes.
A list of all other alternative authentication methods can be found here:
https://duo.com/docs/policy#authentication-methods
Please check back here or subscribe to updates for any changes.
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Latest Updates ( sorted recent to last )
RESOLVED
about 1 month ago - at 03/22/2026 08:33PM
VoIP authentication has returned to normal operation with sustained success rates observed.
MONITORING
about 1 month ago - at 03/22/2026 08:00PM
We are now observing high rates of success of VoIP authentication. We will continue to monitor the situation.
INVESTIGATING
about 1 month ago - at 03/22/2026 07:13PM
We are observing a recovery in voice call processing across the U.S. and are continuing to investigate the root cause of this impact.
INVESTIGATING
about 1 month ago - at 03/22/2026 05:18PM
We are currently investigating an issue causing VOIP authentication failures in all the deployments in the US region and are working to correct the issue as soon as possible. At this time please use alternative authentication methods such as Duo Mobile Push, or SMS passcodes.
A list of all other alternative authentication methods can be found here:
https://duo.com/docs/policy#authentication-methods
Please check back here or subscribe to updates for any changes.
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