Fortigate: How to disable SIP ALG on Fortigate firewall

Overview

The article shows how to disable SIP ALG on Fortigate firewall. SIP  Application Layer Gateway (SIP ALG) is enabled by default. This will cause problems with SIP VoIP phones registration and call processing

Configuration guide article on firmware 6.2.5

How to configure

  • Configure on CLI interface (command line) of Fortigate
  • Find the SIP location on the session-helper
  • Delete SIP (here with the version I use SIP has the number 13, it may be in a different position depending on the version)
  • Disable RTP protocol on Fortigate
  • Reboot the device to record the configuration

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