Mapping FQDNs

The Oracle® Enterprise Session Border Controller maps FQDNs that appear in the certain headers of incoming SIP messages to the IP address that the SBC inserts in outgoing SIP contact headers. The mapped FQDNs are restored in the SIP headers in messages that are sent back to the originator.

This feature is useful to carriers that use IP addresses in the SIP From address to create trunk groups in a softswitch for routing purposes. When the carrier’s peer uses FQDNs, the carrier is forced to create trunk groups for each possible FQDN that it might receive from a given peer. Similarly, this can apply to SIP Contact and P-Asserted-Identity headers.