Last step – restart or power cycle all your SIP phones and devices. You can reboot your firewall or run the command below to reset saved saved session diagnose sys session clear The last set of commands disables processing of RTP protocol on the firewall config voip profile Now execute following commands: delete 13 Disabling SIP ALG Use the following commands for a device on FortiOS starting at 6.2.2 config system settings set sip-expectation disable set sip-nat-trace. Scroll down until you see an entry for SIP, in our example it was number 13 but this may be different depending on model and software release. fortigate sip alg The SIP ALG provides: All the same features as the SIP session helper including NAT and SIP and RTP Pinholes. Next we need to locate SIP entry in session helper list and delete it config system session-helper Rest of configuration is the same for all FortiOS versions If you see an error while entering “set default-voip-alg-mode kernel-helper-based”, just ignore it. Disabling SIP ALG on a Fortigate Firewall Scope: The following article will show you how to disable the SIP ALG setting on a Fortigate Firewall. Set default-voip-alg-mode kernel-helper-basedįortiOS older than software release 6.2.2 : Run following commands from Fortigate firewall CLI config system settings Overview SIP ALG (Application Level Gateway) is a feature in which the network device (router, access point, or any Layer 2 or Layer 3 device) manipulates the payload section of a SIP Packet to change the Private address to be Public address. Incoming phone calls are not reaching the SIP phone(s)īackup configuration of your firewall before making any changesįortiOS starting at software release 6.2.2 : Run following commands from Fortigate firewall CLI config system settings.SIP phones are unable to register on a remote phone system.We observed following problems when SIP ALG is active on Fortigate firewalls: Created on 07-07-2022 06:22 AM Article Id 217022 Technical Tip: Changes in SIP ALG's behavior after upgrading on 7.0 or 7. This will cause problems with SIP VoIP phones registration and call processing. On Fortigate firewalls SIP Application Layer Gateway (SIP ALG) is enabled by default.
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