The Oracle Enterprise Communications Broker (Communications Broker) provides for realm-based access control lists (ACLs) so you can explicitly permit or deny access to the realm on a per-packet basis. By default, the Communications Broker allows all packets to access the realm. You configure ACLs to filter packets by IPv4 address, application protocol (SIP) and transport protocol. You can also specify ranges of that IPv4 addressing for which you want to filter.

The Communications Broker allows ACL configuration via the GUI's System Administration controls. You set the Communications Broker to control access to the realm based on available parameters. You can also configure a free text description of each ACL to clarify their purpose.

In the absence of any ACLs, the Communications Broker allows access to all packets. In addition, ACLs support real-time configuration, meaning they do not require system reboot to become functional.