Shared Session Agent

Usually, the same set of servers (the external proxy) is used for all SIP NATs to the backbone network. In order to support redundant servers in the backbone of a SIP NAT bridge, the original egress realm as determined by the incoming Request URI needs to be retained after a local policy lookup.

When a request arrives at the Oracle® Enterprise Session Border Controller, it determines the matching (target) session agent and, after the local policy is examined, sets the new outbound session agent to the one from the selected target.

If the target session agent’s realm is set to *, the Oracle® Enterprise Session Border Controller retains the original session agent’s realm ID. Because the target session agent does not have a realm ID defined, the original egress realm is retained.