![]() SIP and SCCP Traffic is Handled by the VoIP ALG/Proxy by default in FortiOS 5.SIP is one of the cornerstones of business VoIP you need it to make calls since it creates and maintains connections to the other party. Technical Tip: How to use the SIP ALG to prevent unwanted calls Technical Tip: How to confirm if FortiGate is using SIP Session Helper or SIP ALG # config voip profileĦ) Enable this Protection Profile in the appropriate Firewall Policy(ies) for example. Instructions below are for FortiOS firmware versions 4.0 to 5.2.Įnter the following command to a Voip Profile for SIP, limit REGISTER and INVITE requests to 100 requests per second per firewall policy (values are given as an example). The procedure to enable ALG profile before FortiOS 5.2:ġ) Check the session-helper number: FGT# show system session-helperĢ) Remove this session-helper: FGT# config system session-helperģ) Reboot the FortiGate, in order for the above changes to take effect.Ĥ) Enable VoIP Feature from WebGUI under System->Config->Featuresĥ) Create a VoIP Profile with SIP enabled: This for example, makes FortiGate use sip session-helper for SIP (but keep sccp and other voice traffic under SIP-ALG inspection): # config voip profile The default voip profile can be modified from the default settings. When SIP traffic is detected, the 'default' VoIP profile is used by FortiGate. It is not necessary to apply a VoIPprofile to a Firewall policy to apply SIP ALG. Starting with FortiOS 5.2, SIP-ALG is enabled by default. Until FortiOS 5.0, session-helper was the default SIP inspection mechanism. Reading further, this article is intended for older FortiOS firmware, though similar steps apply. If SIP-ALG was disabled on a recent firmware, you can enable it with: # config system settings ![]() ![]() Fortinet recommends to disable the SIP session-helper (Layer4), and use the SIP Application Layer Gateway (ALG) (Layer7).Ĭurrently supported FortiOS versions have SIP-ALG enabled by default. ![]()
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