Outage in Gamma
Horizon with Webex Mobile APP
Resolved Minor
June 03, 2026 - Started about 1 month ago
- Lasted 1 day
Incident Report
Summary AI Generated
Cisco Webex experienced DNS record issues that caused intermittent inbound call failures on iOS devices using the Horizon with Webex Mobile APP, while outbound calls and Android devices remained unaffected. Cisco engineers identified and resolved the DNS problems within their network. The service was restored after monitoring confirmed successful call delivery, with the incident lasting approximately 30 hours.
Dear Partner, Thank you for your patience, Cisco (Webex) engineers identified an issue with DNS records within their network and have worked to resolve this.
We are now seeing successful call delivery from platform monitoring and our own testing, please retest and confirm services are working.
We will monitor the situation and move this notice to close at 7PM unless the position changes.
Issued 04/06 14:18
Following our previous update, we continue to work with Webex on a resolution as a priority.
In addition to the work with Webex, Gamma engineering teams are also reviewing potential work around options to restore Inbound calls.
Users will continue to see intermittent inbound call failures with IOS devices.
A further update will be provided by 17:00 or sooner should more information become available.
Issued 04/06 13:03
Following our previous update, our engineers have identified the issue to be with call notifications not presenting on IOS devices.
We have raised a ticket with Webex and our engineers are working with them as a priority.
We are continuing to investigate if this issue is impacting Android users however internal testing shows successful calls via Android.
A further update will be provided by 14:15 or sooner should more information become available.
Issued 04/06 11:53
Following our previous update, our engineers are working to address the root cause of the issue as a priority.
Outbound calls remain unaffected at this time.
A further update will be provided by 13:00 or sooner should more information become available.
Issued 04/06 10:55
Following our previous update, our engineers continue to investigate reports of Horizon With Webex inbound calls failing to the mobile APP.
Outbound calls appear unaffected at this time.
A further update will be provided by 12:00 am or sooner should more information become available.
Issued 04/06 10:31
We are currently receiving a high volume of calls and are investigating a potential wider incident with Horizon With Webex Mobile APP.
Our engineers are investigating as a priority.
A further update will be provided by 11:00 am or sooner should more information become available.
We are now seeing successful call delivery from platform monitoring and our own testing, please retest and confirm services are working.
We will monitor the situation and move this notice to close at 7PM unless the position changes.
Issued 04/06 14:18
Following our previous update, we continue to work with Webex on a resolution as a priority.
In addition to the work with Webex, Gamma engineering teams are also reviewing potential work around options to restore Inbound calls.
Users will continue to see intermittent inbound call failures with IOS devices.
A further update will be provided by 17:00 or sooner should more information become available.
Issued 04/06 13:03
Following our previous update, our engineers have identified the issue to be with call notifications not presenting on IOS devices.
We have raised a ticket with Webex and our engineers are working with them as a priority.
We are continuing to investigate if this issue is impacting Android users however internal testing shows successful calls via Android.
A further update will be provided by 14:15 or sooner should more information become available.
Issued 04/06 11:53
Following our previous update, our engineers are working to address the root cause of the issue as a priority.
Outbound calls remain unaffected at this time.
A further update will be provided by 13:00 or sooner should more information become available.
Issued 04/06 10:55
Following our previous update, our engineers continue to investigate reports of Horizon With Webex inbound calls failing to the mobile APP.
Outbound calls appear unaffected at this time.
A further update will be provided by 12:00 am or sooner should more information become available.
Issued 04/06 10:31
We are currently receiving a high volume of calls and are investigating a potential wider incident with Horizon With Webex Mobile APP.
Our engineers are investigating as a priority.
A further update will be provided by 11:00 am or sooner should more information become available.
Components affected
Gamma General NetworkTrusted by 1,000+ teams
The Status Page Aggregator with Early Outage Detection
Stop finding out about outages from your users. Monitor 6,320+ cloud services and get alerted the second something breaks.
Latest Gamma outages
Broadband/Ethernet - 24 days ago
3UK Mobile Data - 28 days ago
Issues on 0292 numbers ported from BT Openreach - about 2 months ago
Mobile data capped or unavailable - 3 months ago
Amsterdam Data Centre Outage - 4 months ago
The Status Page Aggregator with Early Outage Detection
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
Start free trialNo credit card required · Cancel anytime · 6320 services available
Integrations with
