# diagnose debug application sip <- For example 31(1+2) as per below screenshot. A firewall without an integrated SIP server (such AVM Fritz box or. Additionally, the firewall must be prepared to operate correctly with SIP. For traffic matching an expected session, debug flow shows: In order for 3CX to work with VoIP providers and directly connected external extensions it must be able to establish communication to the devices and VoIP provider. For traffic inspected by a helper, debug flow shows: If firewall ipv4 policy has VoIP profile applied then SIP-ALG superseded over session-helper even if system setting is configured with ' set default-voip-alg-mode Kernel-helper-based'.įor the session-helper to kick in, make sure the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. In other words, ALG is not configured and session helper is also not going to kick in since number 13 is deleted. For example, the SIP server is located in an ISP's service cloud that is protected by the FortiGate SIP ALG, and the SIP phones are installed in. 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. I have tested with 100D and let alg enabled, created a sip service port 5060, create a virtual ip mapping wan ip/port to lan ip/port, a voip security profile. A FortiGate with SIP ALG or SIP Session Helper protects the SIP server from the internet, while SIP phones are in remote private networks behind NAT devices that are not aware of the SIP application. 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. 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:
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