IPS-based and voipd-based VoIP profiles

IPS-based and voipd-based VoIP profiles

In FortiOS 7.4.0 and later, the new IPS-based VoIP profile allows flow-based SIP to complement SIP ALG while working together. There are now two types of VoIP profiles that can be configured:

config voip profile
    edit <name>
        set feature-set {ips | voipd}
    next
end

A voipd-based VoIP profile is handled by the voipd daemon using SIP ALG inspection. This is renamed from proxy in previous FortiOS versions.

An ips-based VoIP profile is handled by the IPS daemon using flow-based SIP inspection. This is renamed from flow in previous FortiOS versions.

Both VoIP profile types can be configured at the same time on a firewall policy. For example:

config firewall policy
    edit 1
        set voip-profile "voip_sip_alg"
        set ips-voip-filter "voip_sip_ips"
    next
end

Where:

• voip-profile can select a voip-profile with feature-set voipd.

• ips-voip-filter can select a voip-profile with feature-set ips.

The VoIP profile selection within a firewall policy is restored to pre-7.0 behavior. The VoIP profile can be selected regardless of the inspection mode used in the firewall policy. The new ips-voip-filter setting allows users to select an IPS-based VoIP profile to apply flow-based SIP inspection, which can work concurrently with SIP ALG.

Upon upgrade, the feature-set setting of the voip profile determines whether the profile applied in the firewall policy is voip-profile or ips-voip-filter.

config voip profile
    edit "ips_voip_filter"
        set feature-set flow
    next
    edit "sip_alg_profile"
        set feature-set proxy
    next
end

config firewall policy
    edit 1
        set voip-profile "ips_voip_filter"
    next
    edit 2
        set voip-profile "sip_alg_profile"
    next
end

config voip profile
    edit "ips_voip_filter"
        set feature-set ips
    next
    edit "sip_alg_profile"
        set feature-set voipd
    next
end

config firewall policy
    edit 1
        set ips-voip-filter "ips_voip_filter" 
    next
    edit 2       
        set voip-profile "sip_alg_profile"
    next
end