![]() ![]() I see this as an important portion to understand atleast while working with fortigate firewalls. Enable this option if you don’t want the FortiGate to perform NAT on the addresses in SDP lines. The no-sdp-fixup option is disabled by default and the FortiGate performs NAT on addresses in SDP lines. You can use the no-sdp-fixup option to control whether the Fortigate performs NAT on addresses in SDP lines in the SIP message body. *Controlling NAT for addresses in SDP lines However, the SIP session helper is available and can be useful for high-performance solutions where a high level of SIP security is not a requirement. In most cases you would want to use the SIP ALG since the SIP session helper provides limited functionality. NOTE: Also remove SIP session helper profile under” config system session-helper” Set default-voip-alg-mode kernel-helper-based ![]() If you want to use the SIP session helper you need to enter the following command: *Fortigate VoIP ALG mode “kernel Mode” + Disable Session Helper = no SIP ALG on fortigate.īy default FortiOS uses the Proxy Mode SIP ALG for SIP traffic. ![]() *Fortigate VoIP ALG mode “Proxy Mode”(ALG) = More SIP ALG features /security features and explicit FW policy required. *Session helper + Fortigate VoIP ALG mode “Kernel Mode” = SIP session offload, SDP conversion happens with RTP session pin hole *SIP sessions using port 5060 accepted by a security policy that does not include a VoIP profile are processed by the “SIP session helper”. Tweaking your Fortigate based on your design requirements for SIP VoIP Traffic : SIP network with FortiGate running NAT/Route Mode: SIP with a FortiGate running Transparent Mode When to use”session helper” & “Voip-ALG(Kernel mode)” & “Voip-ALG(Proxy mode)”? This is just my version of the same and with some add-ons!! I know there are other Fortinet Experts who already shared some idea related to this Topic. If you are looking for some idea on change/tweak on fortigate for SIP/VoIP traffic, I believe the below details could give help you a bit of insight on configuring Fortinet for your SIP/VoIP design. ![]()
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