Call4tel

Call4tel Firmware Upgrade Troubleshooting

Common issues when upgrading or operating Call4tel appliances, and how to resolve them.

  1. Reboot loop: connect a monitor and keyboard, log in via Alt+F3, and run the recovery configuration commands.
  2. Unresponsive GUI or a failed upgrade to 3CX v18: verify internet connectivity, then run the reinstall commands.
  3. SBC/3CX mode won't switch ("SBC installed, please switch to 3CX"): run the dedicated switch command — this takes 30-40 minutes to complete.