Replacing Headers

In the SIP signaling message, any Via headers are stripped out and a new one is constructed with the Oracle® Enterprise Session Border Controller’s IP address in the sent-by portion. If a Contact header is present, it is replaced with one that has the Oracle® Enterprise Session Border Controller’s IP address. All other headers are subject to NATing based on the following rules:

• The Request-URI is replaced with the next hop’s IP or FQDN address.
• All other headers are replaced based on the two SIP NAT function SIP NAT function rules