Anonymous Requests

If a SIP endpoint sends an INVITE message with a From header that is anonymous, the Oracle® Enterprise Session Border Controller can find the registration cache entry by using the Contact and Via headers. In cases such as instant messaging (IM), where there is no Contact header, the Oracle® Enterprise Session Border Controller can use the Via header.

The Oracle® Enterprise Session Border Controller’s checks whether the reg-via-key option is configured for the access-side SIP interface where a REGISTER is received. If the option is enabled, the Oracle® Enterprise Session Border Controller makes the via-key by adding the IP address from the Via header to the firewall address (if there is a firewall present between the Oracle® Enterprise Session Border Controller and the endpoint).

When an INVITE arrives at a SIP interface where this option is enabled, the Oracle® Enterprise Session Border Controller determines whether the From header is anonymous or not. If it is anonymous, then the Oracle® Enterprise Session Border Controlleruses the Via-key to find the registration entry.