SIP NAT Translations

There are other translations that occur by way of SIP NAT functionality acting on the SIP R-URI, From-URI, and To URI headers. The translation of URIs in the SIP message occurs as messages are received and sent from the Oracle® Enterprise Session Border Controller’s SIP proxy. These translations create a bridge between the external and home realms and remove all references to the original IPv4 addressing from the packets sent to the destination network.

The purpose of this translation is to prevent private IPv4 addresses from appearing in SIP message URIs while traveling through the public network. This aspect of the SIP NAT’s functionality involves either translating the private address to a public address or encrypting the private address into the URI.