Bandwidth-Based Admission Control

The Oracle® Enterprise Session Border Controller is a policy enforcement point for bandwidth-based call admission control. Sessions are admitted or rejected based on bandwidth policies, configured on the Oracle® Enterprise Session Border Controller for each realm.

To manage bandwidth consumption of a network’s overall capacity, you can configure aggregate bandwidth policies for each realm.

As the Oracle® Enterprise Session Border Controller processes call requests to and from a particular realm, the bandwidth consumed for the call is decremented from the bandwidth pool for that realm. The Oracle® Enterprise Session Border Controller determines the required bandwidth from the SDP/H.245 information for SIP and from the OLC sent in the SETUP message for H.323. Any request that would cause the bandwidth constraint to be exceeded is rejected with a SIP 503 Service Unavailable or an H.323 Release Complete.

For example, if an incoming SIP message requests PCMU for a payload/encoding name, a zero (0) payload type, and an 8000 cycle clock rate, the Oracle® Enterprise Session Border Controller must determine how much bandwidth is needed.

To accomplish this task, the system checks the media profile values and reserves the bandwidth required for flows. If the required bandwidth for the new flow exceeds the available bandwidth at the time of the request, the Oracle® Enterprise Session Border Controller rejects the session.

With these mechanisms, the Oracle® Enterprise Session Border Controller provides bandwidth-based admission control.