![]() Normally Fortigate firewalls do not require a reboot when you change configuration, but, it seems, in this case we need reboot it to activate session helper changes. A VoIP profile, sip, has already been created. The last set of commands disables processing of RTP protocol on the firewall config voip profile NAT46 is used with SIP ALG to allow for seamless communication. Now execute following commands: delete 13 Scroll down until you see an entry for SIP, in our example it was number 13 but this may be different depending on model and software release. To Disable SIP ALG follow the below steps Backup your firewall config first For FortiOS 6.2.2 and above config system settings set sip-expectation disable set sip-nat-trace disable set default-voip-alg-mode kernel-helper-based end For FortiOS below 6.2.2 ( 6.2.0 down to 5.2. ![]() Next we need to locate SIP entry in session helper list and delete it config system session-helper Rest of configuration is the same for all FortiOS versions Disable SIP ALG In the Command Line Interface (CLI) run the following commands: config system settings set default-voip-alg-mode kernel-helper-based set sip-helper disable set sip-nat-trace disable end Reboot the Router while using the Web GUI under Status, or in the CLI with the following command: execute reboot. Your router can also function as a modem for some broadband gateways. CLI access to the Fortigate Firewall Disabling SIP ALG Open the CLI. To disable SIP ALG, you will need to log into your router. If you see an error while entering “set default-voip-alg-mode kernel-helper-based”, just ignore it. Fortigate VoIP ALG mode kernel Mode + Disable Session Helper no SIP ALG on. NAT46 and NAT64 for SIP ALG SIP message inspection and filtering. Set default-voip-alg-mode kernel-helper-based For example, a Fortigate was configured in 6.4 as: config system settings. ![]() After upgrading to 7.0 or 7.2, Flow-Based SIP will now run by default in a firewall policy which is configured as flow inspection mode. Run following commands from Fortigate firewall CLI config system settings However, the original SIP ALG has much more advanced capabilities for VoIP inspection. FortiOS older than software release 6.2.2
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