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Gurpreet_Kaur
Staff
Gurpreet_Kaur
Staff
March 17, 2026

Troubleshooting Tip: Call forwarding issue with FortiGate

  • March 17, 2026
  • 0 replies
  • 154 views
Description This article describes a call forwarding issue where traffic from a landline/IP phone is not being forwarded to a mobile number through FortiGate.
Scope FortiGate.
Solution

To troubleshoot the call forwarding issue, follow these steps:

  • Go to the FortiGate and run the command execute diagnose sys session list to view the current sessions.
  • Check the session list for any errors or dropped packets that may be causing the call forwarding issue.
  • Run the command exec diagnose sys session filter dst <VIP_IP> to filter the sessions by destination IP address.
  • Analyze the filtered session list to identify any potential issues with the call forwarding configuration.
  • Verify that the call forwarding configuration is correct and that the FortiGate is properly configured to forward calls to the mobile number.
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