Establishing Media Flows

During call setup, the ports for bidirectional media flows are established dynamically. Since the media flows also pass through the Oracle® Enterprise Session Border Controller, it can identify the IPv4 address/port information on the NAT device used for the outgoing media coming from the user name/phone number. The Oracle® Enterprise Session Border Controller then uses that same NAT’s IPv4 address/port information to send incoming media to the correct user name/phone number behind the NAT device.