Configuring SIP IP address conservation for the SIP ALG

Configuring SIP IP address conservation for the SIP ALG

You can use the following command to enable or disable SIP IP address conservation in a VoIP profile for the SIP ALG. SIP IP address conservation is enabled by default in a VoIP profile.

config voip profile edit VoIP_Pro_1 config sip set nat-trace disable

end

end

If the SIP message does not include an i= line and if the original source IP address of the traffic (before NAT) was 10.31.101.20 then the FortiGate would add the following i= line.

i=(o=IN IP4 10.31.101.20)

You can also use the preserve-override option to configure the SIP ALG to either add the original o= line to the end of the i= line or replace the i= line in the original message with a new i= line in the same form as above for adding a new i= line.

By default, preserver-override is disabled and the SIP ALG adds the original o= line to the end of the original i= line. Use the following command to configure the SIP ALG to replace the original i= line:

config voip profile edit VoIP_Pro_1 config sip set preserve-override enable

end

end


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