![]() To use the proxy mode you have to set the default-voip-alg-mode to proxy and then configure VOIP UTM profiles and assign them to the relevant firewall policies. ![]() This all being said, I have actually had a pretty reasonable amount of success with the SIP ALG helper (proxy mode, not kernel mode), especially between handsets SIP gateway If you have multiple devices connecting to the SIP server across the firewall with NAT enabled behind the same IP address, you need overload NAT instead, otherwise both phones will attempt to egress with source port 5060 on the same public IP address and that port will be blocked. I often see people set this as one-to-one NAT which is the correct thing to do IF you are just doing a simple PBX/SIP Gateway SIP Server connection. Something to be sure of is make sure your handsets are NOT egressing on the same IP address as each other using NAT one-to-one (either by being set through the policy with the keep source-port setting, or through the IP Pool being set). Those services that interfere with VOIP tend to cause an issue with the actual voice data, not the SIP control plane (eg call establishes but 1way or 0 way voice traffic) The fact you are having a registration problem is pretty rare, and usually not related to VOIP inspection/session-helpers/proxy ALGs. Sharing dumps violates a reddit global rule and may result in a site-wide ban. Posting brain or answer dumps for Fortinet certifications is prohibited as they are copyrighted material. What you have already tried as part of your troubleshooting process.Version and type of software being impacted (i.e.Some examples of useful information are the following: Next, please provide us as much information about your problem as you possibly can. ![]() If you're having a problem with a Fortinet product, first, make sure you submit your request to Fortinet TAC if you have a valid support contract. Here you can ask for help, share tips and tricks, and discuss anything related to Fortinet and Fortinet Products. Fortinet is a global leader and innovator in Network Security.
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