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CallTower Outage History

Every past CallTower outage tracked by IsDown, with detection times, duration, and resolution details.

There were 130 CallTower outages since September 2021. The 12 outages from the last 12 months are summarized below, with incident details, duration, and resolution information.

Minor April 29, 2026

April 2026: Five9 Service Degradation – Call Performance and Connectivity Issues

Detected Apr 29, 2026 1:22 PM EDT · Resolved Apr 29, 2026 3:02 PM EDT · Duration about 2 hours

CallTower's Five9 service experienced degradation for 1.7 hours, causing call delays, audio issues, slow browser performance, and connection problems for affected customers. Multiple customers reported these issues, prompting CallTower to open a master case and investigate with Five9 engineering as a top priority. The service was restored to normal operation through coordination with Five9 Engineering, with a root cause analysis to be provided within three business days.

Major March 2, 2026

March 2026: CT Cloud Communicator Mobile Inbound calls, Outbound calls, and Login Issues

Detected Mar 2, 2026 11:52 AM EST · Resolved Mar 2, 2026 3:17 PM EST · Duration about 3 hours

CallTower's CT Cloud Communicator Mobile service experienced widespread inbound and outbound call failures and login issues affecting multiple customers for 3.4 hours. The problem was identified as vendor-related and isolated to a specific affected system. CallTower Engineering resolved the issue by implementing a configuration change based on vendor guidance and continued monitoring to ensure full resolution.