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      Disabling SIP ALG on Fortigate

      Disabling SIP ALG

      • Open the CLI interface for your Fortigate Firewall
        1. Before making any changes be sure to backup your configuration
      • In the CLI enter the following commands 
        1. Use the following commands for a device on FortiOS starting at 6.2.2
        2. config system settings
        3. set sip-expectation disable
        4. set sip-nat-trace disable
        5. set default-voip-alg-mode kernel-helper-based
        6. end
      • For devices below FortiOS version 6.2.2 use the following commands
        1. config system settings
        2. set sip-helper disable
        3. set sip-nat-trace disable
        4. set default-voip-alg-mode kernel-helper-based

        5. end

      • Reference: https://voipdocs.io/en/articles/316-disabling-sip-alg-on-a-fortigate-firewall