About Realms and Network Interfaces
All realms reference network interfaces on the Oracle® Enterprise Session Border Controller. This reference is made when you configure a list of network interfaces in the realm configuration.
You configure a network interface to specify logical network interfaces that correspond existing phy-interfaces on the Oracle® Enterprise Session Border Controller. Configuring multiple network interfaces on a single phy-interface creates a channelized phy-interface, a VLAN. VLANs, in turn, allow you to reuse address space, segment traffic, and maximize bandwidth.
In order to reach the realms you configure, you need to assign them network interfaces. The values you set for the name and port in the network interface you select then indicate where the realm can be reached.