See the Fortigate Technical documentation page for further details. Run the following commands: config system session-helper show Amongst the displayed settings will be one similar to the following example: edit 13 set name sip set protocol 17 set port 5060 In this example the next commands would be: delete 13 end Step 2) Change the default voip alg-mode. You may need to disable both profiles to fully stop the ALG. There are typically two VOIP profiles on a factory shipped Fortinet firewall. If disabling the session helper does not work, disable the SIP ALG as well.ġ Enter the following command to find the sip session helper entry in the session-helper list:Ģ Enter the following command to delete session-helper list entry number 10 to disable the sip session helper: Configure on CLI interface (command line) of Fortigate. As mentioned in the KB, its the original/old/not-VDOM-based way to handle SIP sessions before they implemented ALG (proxy base). The SIP ALG functionality seems to be harder to disable (even if it is. If you are experiencing one way audio issues disable this feature first, reboot your IP phone then try making another call. On Fortigate firewalls SIP Application Layer Gateway (SIP ALG) is enabled by. ![]() The first feature is called the “SIP Session Helper”. FortiOS has two features that can modify the SIP headers and SDP parameters. Article Id 217022 Technical Tip: Changes in SIP ALG's behavior after upgrading on 7.0 or 7.
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