Deleting sip-helper from global context, will make it inaccessible for all VDOMs. Note3: Multi-vdom considerations: sip-helper is a global setting. Fine-tuning SIP-ALG is done through the voip profile. The commands associated with the SIP-helper will not be relevant if the FortiGate is using SIP-ALG. Note2: disabling SIP session-helper is only necessary if ALL the SIP inspection must be removed. Note1: When a firewall policy has a voip-profile applied, SIP-ALG is used over SIP session-helper, even if disabled. All other VoIP equipment must also refer to the SIP server by its public IP.Ģ) Open up corresponding audio ports through VIP on the FortiGate.įirewall policies must now explicitly allow all UDP ports to be opened for the audio traffic (and not only the SIP 5060 or SCCP 2000 control ports).ĭisabling SIP inspection can be done partially or completely. If the SIP traffic is NAT'd when passing through the FortiGate, the SIP server must be configured to use its public IP address in the application header. In preparation for removing SIP proxy & session helper functionality, two steps are required.ġ) Modify the local SIP server (if NAT is used). In FortiOS 5.0, if VoIP profile is not applied, the SIP session helper will be applied. Since FortiOS 5.2, the FortiOS proxy/ALG handles all SIP traffic by default. Possible reasons to disable VoIP inspection include:ġ) Troubleshooting (to isolate a problem).Ģ) As a workaround, either to address incorrect FortiGate SIP ALG behavior or to allow non-standard SIP handling in the overall VoIP deployment. When in this mode, FortiGate acts as a basic firewall. This article explains how to disable the use of SIP or SCCP proxy/ALG and/or session-helper. This is available in the Fortinet Document Library. Otherwise, firewall policies must be used to statically open a wide range of ports for RTP/audio (through a VIP).ģ) Inspection and logging of VoIP traffic.įor more details on the benefits of the SIP ALG in FortiOS, as well as information on how to troubleshoot SIP issues, consult the VoIP Solutions of the FortiOS handbook. Otherwise, SIP-helper can open these ports with very basic Layer4 logic. Use of an Application Layer Gateway (ALG) allows for:ġ) Modification of IP addresses in the application payload when NAT is used.Ģ) Dynamic opening of data ports ('pinholes') as required to allow audio traffic. Re-enabling SIP-ALG will require a restart.ĭISABLING SIP-ALG IS NOT THE FIRST TROUBLESHOOTING ACTION TO TAKE! NOTE: disabling the VoIP inspection may influence the production systems. In some cases, other vendors recommend disabling the SIP inspection altogether on the FortiGate (carefully note the date and FortiGate model of the articles, which may be outdated). The alternative in FortiGate, SIP-helper, is obsolete and provides a very basic pinhole opening service. This article describes how to disable SIP-inspection on FortiGate and explains the consequences.įortinet recommends the use of SIP/SCCP proxy/ALG (called SIP-ALG even though it does not handle only SIP traffic) in most situations.
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