Realms and Nested Realms
This chapter explains how to configure realms and nested realms, and specialized media-related features.
A realm is a logical definition of a network or groups of networks made up in part by devices that provide real-time communication sessions comprised of signaling messages and possibly media flows. These network devices might be call agents, softswitches, SIP proxies, H.323 gatekeepers, IP PBXs, etc., that are statically defined by IPv4 addresses. These network devices might also be IPv4 endpoints: SIP phones, IADs, MAs, media gateways, etc., that are defined by an IPv4 address prefix.
Realms support bandwidth-based call admission control and QoS marking for media. They are the basis for defining egress and ingress traffic to the Oracle® Enterprise Session Border Controller—which supports the Oracle® Enterprise Session Border Controller’s topology hiding capabilities.
This chapter also explains how to configure media ports (steering pools). A steering pool exists within a realm and contains a range of ports that have a common address (for example, a target IPv4 address). The range of ports contained in the steering pool are used to steer media flows from one realm, through the Oracle® Enterprise Session Border Controller, to another.
Finally, in this chapter you can learn about TOS/DiffServ functionality for realm-based packet marking by media type.