The Oracle Enterprise Communications Broker (ECB) 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 ECB 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 ECB allows ACL configuration via the GUI's System Administration controls. You set the ECB 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 ECB allows access to all packets. In addition, ACLs support real-time configuration, meaning they do not require system reboot to become functional.