|Description||This article explains the recommended scenarios to use each VoIP mode that is available on a FortiGate firewall.|
|Scope||Any supported version of FortiGate.|
The following VoIP modes are available on the FortiGate firewall:
Use the following CLI command to review the VOIP mode:
config system settings
The query will return the following:
proxy-based: Use a default proxy-based VoIP ALG.
kernel-helper-based: Use the SIP session helper.
An SIP session helper is used when traffic does not match a policy that includes a VOIP security profile and the VOIP mode is set to kernel-helper-based.
SIP ALG is used in the following conditions: