CallTower Outage History

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CallTower had 42 outages in the last 2 years totaling 207h 23m of downtime — averaging 1.7 incidents per month.

There were 42 CallTower outages since May 30, 2024 totaling 207h 23m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.calltower.com

Minor April 29, 2026

Five9 Service Degradation – Call Performance and Connectivity Issues

Detected by Pingoru
Apr 29, 2026, 05:22 PM UTC
Resolved
Apr 29, 2026, 06:59 PM UTC
Duration
1h 37m
Affected: Five9
Timeline · 2 updates
  1. investigating Apr 29, 2026, 05:22 PM UTC

    CallTower Support has received reports of issues impacting some Five9 customers. Users may experience call delays, Audio issues, intermittent slow browser speed, and connection issues to Five9. CallTower support is currently investigating with Five9 engineering to mitigate and resolve these issues. *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 [email protected]. CallTower intends to post updates on status.calltower.com approximately every 60 minutes, unless identified otherwise. This issue is being investigated as a top priority.

  2. resolved Apr 29, 2026, 06:59 PM UTC

    CallTower Support has confirmed resolution of the Five9-related issues that were impacting call delays, audio issues, browser speed, and connection issues to Five9. The issue was addressed in coordination with Five9 Engineering, and services are operating normally at this time. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Notice February 20, 2026

Intermedia Contact Center Issues Logging In, Inbound and Outbound Voice Calling Failures

Detected by Pingoru
Feb 20, 2026, 07:15 PM UTC
Resolved
Feb 20, 2026, 07:15 PM UTC
Duration
—
Affected: Intermedia
Timeline · 1 update
  1. resolved Feb 20, 2026, 07:15 PM UTC

    Some CallTower customers may have briefly experienced issues with Intermedia Contact Center Voice and login. The issue was identified as an Intermedia service outage and has since been resolved. Update from Intermedia: Intermedia Engineering teams identified the root cause as a Cloudflare service disruption that affected connectivity to certain Intermedia services. The third-party provider has since restored service, and Intermedia has verified that Email, Contact Center, and Voice services are fully operational. If any issues persist, customers are advised to contact Intermedia Support for assistance. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Notice January 2, 2026

CT Cloud Communicator Failed Update

Detected by Pingoru
Jan 02, 2026, 04:23 PM UTC
Resolved
Jan 02, 2026, 04:24 PM UTC
Duration
25s
Affected: CT Cloud VoiceCT Cloud Meeting
Timeline · 2 updates
  1. investigating Jan 02, 2026, 04:23 PM UTC

    CallTower engineers have identified and resolved an issue impacting customers using CT Cloud Communicator. The problem was caused by a failed update that did not download correctly, resulting in application failures. To restore service, our engineers have reverted the update and will not reapply it until we have confirmed with the vendor that it can be deployed successfully. This will not affect customers who have manually updated to the newest version of the app; they can continue to use it without issue. A detailed summary of the event is provided below. If you continue to experience any issues, please contact CallTower Support for assistance. Start Time: Around 6:30 AM MST End Time: 8:18 AM MST Resolution Action: The update was rolled back to the previous version.

  2. resolved Jan 02, 2026, 04:24 PM UTC

    This incident has been resolved.

Read the full incident report →

Minor November 4, 2025

Toll-Free Inbound Call Failures.

Detected by Pingoru
Nov 04, 2025, 06:43 PM UTC
Resolved
Nov 05, 2025, 02:28 PM UTC
Duration
19h 45m
Affected: Global SIP Trunk
Timeline · 4 updates
  1. investigating Nov 04, 2025, 06:43 PM UTC

    CallTower Support has received multiple reports of failures affecting Toll-Free inbound calls. Our Engineering team is actively investigating the issue. 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 [email protected]. CallTower intends to post updates on status.calltower.com approximately every 60 minutes, unless identified otherwise. This issue is being investigated as a top priority.

  2. monitoring Nov 04, 2025, 07:34 PM UTC

    CallTower Engineering has worked with affected vendors to implement a resolution for the Toll-Free inbound call issue. We are currently seeing resolution of the issue and are continuing to monitor to ensure continued stability and performance CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 60 minutes, unless identified otherwise.

  3. monitoring Nov 04, 2025, 08:31 PM UTC

    CallTower Engineering has worked with affected vendors to implement a resolution for the Toll-Free inbound call issue. We are currently seeing continued stability and performance and will continue to monitor. If you experience any persisting issues, please provide the most recent call example and we will continue to investigate. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com as soon as any new information is made available.

  4. resolved Nov 05, 2025, 02:28 PM UTC

    CallTower is considering this issue resolved. If you experience any persisting issues, please provide the most recent call example and we will troubleshoot accordingly. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Critical September 4, 2025

Five9 Inbound/Outbound Call Failures

Detected by Pingoru
Sep 04, 2025, 09:30 PM UTC
Resolved
Sep 04, 2025, 09:45 PM UTC
Duration
15m
Affected: Five9
Timeline · 2 updates
  1. identified Sep 04, 2025, 09:30 PM UTC

    Identified: CallTower Support has received reports of inbound and outbound call failures with Five9. We are actively working with Five9 to investigate and mitigate the issue. In the meantime, we ask customers experiencing this issue to retest their calls. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise.

  2. resolved Sep 04, 2025, 09:45 PM UTC

    Resolved: CallTower Support has confirmed with Five9 as well as multiple customers that the issue is now resolved. CallTower will be closing this master case and all associated cases. If you continue to experience any problems, please contact CallTower Support at 800-347-5444 or [email protected]

Read the full incident report →

Minor July 30, 2025

US Webex Customers experiencing call quality degradation, or call failures

Detected by Pingoru
Jul 30, 2025, 03:33 PM UTC
Resolved
Aug 01, 2025, 03:26 PM UTC
Duration
1d 23h
Affected: Cisco Webex Contact CenterCisco Webex Calling
Timeline · 3 updates
  1. identified Jul 30, 2025, 03:33 PM UTC

    Cisco has announced they are continuing to experience a network event similar to the one they had Yesterday, 730/2025. Cisco Engineering teams are collaborating on potential mitigation actions, including rerouting and optimizing network traffic to resolve the impact. This issue may cause degradation in media quality for some Webex Calling users and Webex Contact Center agents in the US region. Additionally, some provisioning tasks and emergency calls may fail, and certain Cisco Calling Plan services may also experience failures. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 60 minutes, unless identified otherwise.

  2. monitoring Jul 30, 2025, 06:04 PM UTC

    Cisco's Engineering team has successfully implemented mitigation measures, and all impacted services are now fully operational and stable. CallTower will continue to monitor the situation closely and will share further updates as they become available. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com.

  3. resolved Aug 01, 2025, 03:26 PM UTC

    This incident has been resolved.

Read the full incident report →

Major July 10, 2025

EMEA intermittent inbound call failure

Detected by Pingoru
Jul 10, 2025, 12:23 PM UTC
Resolved
Jul 10, 2025, 03:34 PM UTC
Duration
3h 11m
Affected: Microsoft Teams - Direct RoutingGlobal SIP TrunkCisco Webex Calling
Timeline · 4 updates
  1. investigating Jul 10, 2025, 12:23 PM UTC

    CallTower has identified the issue affecting the completion of some inbound calls in the EMEA region. CallTower engineers are urgently working with our vendor to implement a fix. *CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise.

  2. investigating Jul 10, 2025, 12:40 PM UTC

    CallTower has isolated the issue to a faulty network device that is causing inbound calls to fail on certain routes. Our network engineers are working diligently to restore service as quickly as possible. *CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise.

  3. monitoring Jul 10, 2025, 12:51 PM UTC

    Voice network engineers were able to apply a workaround, and are seeing inbound calls completing at this time. Please retest and advise if you are experiencing any persisting issues. CallTower continues to work on resolving the faulty network device that is impacting inbound calls to the EMEA region. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com as soon as any new information is available.

  4. resolved Jul 10, 2025, 03:34 PM UTC

    The issue is considered resolved and the associated cases will be closed out. Default messaging: CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Major May 19, 2025

Outbound Calls Failing for CT Cloud SIP Customers

Detected by Pingoru
May 19, 2025, 07:26 PM UTC
Resolved
May 19, 2025, 08:26 PM UTC
Duration
1h
Affected: CT Cloud SIP
Timeline · 3 updates
  1. investigating May 19, 2025, 07:26 PM UTC

    CallTower is investigating multiple reports of outbound calls failing for SIP trunking customers. *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 [email protected]. 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.

  2. investigating May 19, 2025, 07:58 PM UTC

    CallTower Engineering is actively investigating the issue causing outbound call failures with CT Cloud SIP. CallTower Support has set the trunk's outbound configuration to default as a workaround until a permanent resolution can be established. 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 [email protected]. 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.

  3. resolved May 19, 2025, 08:26 PM UTC

    The CallTower Engineering team has resolved an issue with customers using a limited selection of routes for increased T.38 compatibility. CallTower Support has tested several trunks and has confirmed the outbound issue to be resolved. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Notice March 18, 2025

Outbound Calls Failing

Detected by Pingoru
Mar 18, 2025, 08:40 PM UTC
Resolved
Mar 18, 2025, 09:31 PM UTC
Duration
51m
Affected: Cisco VoiceCT Cloud VoiceMicrosoft Teams - Direct RoutingMicrosoft Operator Connect
Timeline · 3 updates
  1. investigating Mar 18, 2025, 08:40 PM UTC

    CallTower is urgently investigating reports of some outbound calls failing. We have engaged our carrier to assist in the investigation. *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 [email protected]. 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.

  2. investigating Mar 18, 2025, 09:07 PM UTC

    CallTower has identified the issue affecting the completion of some outbound calls. CallTower engineers are urgently working with our vendor to implement a fix. *CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise.

  3. resolved Mar 18, 2025, 09:31 PM UTC

    CallTower engineers have collaborated with our vendor to resolve the issue affecting some outbound calls. We are now observing successful traffic completion. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Major February 5, 2025

Intermedia Contact Center - Issues Making Outbound Calls

Detected by Pingoru
Feb 05, 2025, 02:23 PM UTC
Resolved
Feb 05, 2025, 03:24 PM UTC
Duration
1h 1m
Affected: Intermedia
Timeline · 3 updates
  1. investigating Feb 05, 2025, 02:23 PM UTC

    CallTower is investigating reports of issues making outbound calls through the Intermedia contact center. Users report that the application gets stuck on the dial-out screen and is receiving a 55102 error. We have engaged Intermedia to assist in finding a resolution. *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 [email protected]. 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.

  2. investigating Feb 05, 2025, 03:04 PM UTC

    CallTower engineers continue to urgently investigate the issues affecting outbound calling through Intermedia contact center. We have this issue at our highest priority. *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 [email protected]. 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.

  3. resolved Feb 05, 2025, 03:24 PM UTC

    CallTower has identified the issue affecting outbound calling through Intermedia contact center. We have implemented a change and have confirmed that calls are again working as expected. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Major November 8, 2024

Unable to Log In to CT Cloud Communicator

Detected by Pingoru
Nov 08, 2024, 07:36 PM UTC
Resolved
Nov 08, 2024, 08:34 PM UTC
Duration
57m
Affected: CT Cloud SIPCT Cloud Voice
Timeline · 2 updates
  1. investigating Nov 08, 2024, 07:36 PM UTC

    CallTower support is investigating multiple reports of users unable to log into the CT Cloud Communicator, but has not identified/confirmed there is an issue on our network or with our services. 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 [email protected]. 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.

  2. resolved Nov 08, 2024, 08:34 PM UTC

    The problem with users not being able to log into CT Cloud Communicator Desktop is fixed. CallTower worked with our vendor and found a bug that was preventing users from logging in. CallTower engineers are working on a permanent fix. Affected users should close and reopen the CTCC Desktop app, then log back in. CallTower will close this case and related cases. An Official or Preliminary Root Cause Analysis (RCA) will be available within three business days and provided to customers upon request. The issue is resolved, and the cases will be closed.

Read the full incident report →

Critical October 18, 2024

WebEx Inbound and Outbound Call Failures

Detected by Pingoru
Oct 18, 2024, 04:17 PM UTC
Resolved
Oct 18, 2024, 06:58 PM UTC
Duration
2h 40m
Affected: Cisco Webex Calling
Timeline · 3 updates
  1. investigating Oct 18, 2024, 04:17 PM UTC

    CallTower support is investigating multiple reports of an inbound and outbound call failures on the WebEx Platform but has not identified/confirmed there is an issue on our network or with our services. 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 [email protected]. 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.

  2. monitoring Oct 18, 2024, 04:59 PM UTC

    CallTower Support has received multiple reports from customers that the WebEx inbound and outbound calling symptoms have resolved. CallTower Engineering continues to investigate the cause of the WebEx inbound and outbound call disruption. 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 [email protected]. 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.

  3. resolved Oct 18, 2024, 06:58 PM UTC

    The issue with WebEx inbound and outbound calling is considered resolved and the associated cases will be closed out. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Minor October 7, 2024

Call Failures

Detected by Pingoru
Oct 07, 2024, 06:07 PM UTC
Resolved
Oct 07, 2024, 08:35 PM UTC
Duration
2h 28m
Affected: Microsoft Operator Connect
Timeline · 3 updates
  1. identified Oct 07, 2024, 06:07 PM UTC

    CallTower Engineers are aware of an issue causing call failures for our Teams Operator Connect and are working to resolve it. 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 [email protected]. 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.

  2. monitoring Oct 07, 2024, 06:36 PM UTC

    CallTower Engineers have made a change to route around the issue. Our testing shows that calls are now completing as expected. CallTower will continue to monitor. If you are still experiencing an issue please provide Support with call examples to investigate. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise.

  3. resolved Oct 07, 2024, 08:35 PM UTC

    CallTower Engineers have continued to monitor the issue and have not seen any further issues. CallTower believes the issue has been resolved. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →

Minor October 7, 2024

Duplicate Incoming Calls

Detected by Pingoru
Oct 07, 2024, 02:40 PM UTC
Resolved
Oct 07, 2024, 04:53 PM UTC
Duration
2h 13m
Affected: Microsoft Teams - Direct RoutingMicrosoft Operator Connect
Timeline · 5 updates
  1. investigating Oct 07, 2024, 02:40 PM UTC

    CallTower is investigating reports of customers receiving duplicate incoming calls on Intermedia. 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 [email protected]. 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.

  2. identified Oct 07, 2024, 03:18 PM UTC

    CallTower support has identified multiple reports of customer receiving inbound calls on the Teams Operator Connect platform. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise.

  3. identified Oct 07, 2024, 03:52 PM UTC

    CallTower Engineers continue to investigate the issue of duplicate incoming calls for our Teams Operator Connect and Intermedia customers. Please continue to send in specific call examples to help us with our investigation. 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 [email protected]. 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.

  4. monitoring Oct 07, 2024, 04:21 PM UTC

    CallTower Engineers have identified an issue and implemented a change. We have confirmed through testing that the issue with duplicate calls have been resolved. Please reach out to CallTower Support if you are still experiencing issues. CallTower will continue to monitor.

  5. resolved Oct 07, 2024, 04:53 PM UTC

    CallTower has continued to monitor the issue. Our testing and the testing of some of our customers have continued to show successful results. CallTower believes the issue is resolved. CallTower will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.

Read the full incident report →