Registering Endpoints

The Oracle® Enterprise Session Border Controller uses periodic endpoint registration messages to dynamically establish and maintain bindings in the NAT. These bindings keep a signaling port (port that is opened on a firewall to allow traffic to pass through it is a pinhole) open in the NAT that allows the inbound signaled communications to pass through. Using the endpoint registrations, the Oracle® Enterprise Session Border Controller then maps the Layer 3 (OSI network layer that deals with switching and routing technologies for data transmission between network devices) IPv4 address/port information from the NAT device to the Layer 5 (OSI session layer that deals with session and connection coordination between applications) entity (for example, user name or phone number) behind the NAT so that when an incoming signaling message is received, the Oracle® Enterprise Session Border Controller sends it to the appropriate address and port on the NAT for the called party.