Fortinet / Fortigate

February 2018

Information passed along by a customer for the Fortigate OS version 5.4.x

Fortigate configuration that turned off the SIP and allowed audio:


Fortigate OS version 5.4.x

 edit 13

set name sip

set port 5060

set protocol 17




config system settings

set sip-helper disable

set sip-nat-trace disable

set default-voip-alg-mode kernel-helper-based



Then create a rule allowing all traffic outbound from the LAN to the OnSIP public IPs


After that is done reboot the firewall.  This will clear all the sessions.

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