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> Chapter 34 - VoIP Solutions: SIP > How the SIP ALG performs NAT > Controlling NAT for addresses in SDP lines

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Controlling NAT for addresses in SDP lines

You can use the no-sdp-fixup option to control whether the FortiGate performs NAT on addresses in SDP lines in the SIP message body.

The no-sdp-fixup option is disabled by default and the FortiGate performs NAT on addresses in SDP lines. Enable this option if you don’t want the FortiGate to perform NAT on the addresses in SDP lines.

config voip profile

edit VoIP_Pro_1

config sip

set no-sdp-fixup enable

end

end