![]() ![]() ![]() # diagnose debug application sip <- For example 31(1+2) as per below screenshot. For traffic matching an expected session, debug flow shows: For traffic inspected by a helper, debug flow shows: If firewall ipv4 policy has VoIP profile applied then SIP-ALG superseded over session-helper even if system setting is configured with ' set default-voip-alg-mode Kernel-helper-based'.įor the session-helper to kick in, make sure the VOIP profile is not enabled in the firewall ipv4 policy. If for example under the VOIP profile, SIP is disabled but default-voip-alg-mode is set to proxy-based, then, in that case, the SIP session helper will be used and not the default ALG. Doesn’t matter, Fortivoice has its own SIP ALG, the one on the FortiGate will conflict with it. The contact IP was changed to an interface IP of the gate not even involved in the call flow (wasn't even NAT for this leg, only between FortiVoice and Telco PBX). In other words, ALG is not configured and session helper is also not going to kick in since number 13 is deleted. Best part is, this was FortiVoice to FortiPhone SIP. Once session helper number 13 is deleted, and does not change default-voip-alg-mode proxy-based then basically traffic is relying on IPv4 policy. If kernel-helper-based is configured then it means that traffic is relying on session helper to assist the VOIP traffic. If proxy-based is selected which is a default mode, then no matter if session helper is configured, ALG mode supersedes and session helper is doing nothing. We'll show step-by-step how to disable it on your router. This article describes methods to choose SIP-ALG and Session Helper.īy default, FortiGate is using SIP ALG to process SIP traffic however some SIP providers recommend disabling SIP ALG in the firewall.īelow are points that need to be understood: SIP ALG: What Is It & Why You Should Disable It for VoIP For peak VoIP calling performance, you should turn off SIP ALG (Application Layer Gateway). ![]()
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