Configuration Overview

To plan steering pool ranges, take into account the total sessions available on the box, determine how many ports these sessions will use per media stream, and assign that number of ports to all of the steering pools on your Oracle® Enterprise Session Border Controller. For example, if your Oracle® Enterprise Session Border Controller can accommodate 500 sessions and each session typically uses 2 ports, you would assign 1000 ports to each steering pool. This strategy provides for a maximum number of ports for potential use, without using extra resources on ports your Oracle® Enterprise Session Border Controller will never use.

The following table lists the steering pool parameters you need to configure:

Parameter	Description
IP address	IPv4 address of the steering pool.
start port	Port number that begins the range of ports available to the steering pool. You must define this port to enable the system to perform media steering and NAT operations.
end port	Port number that ends the range of ports available to the steering pool. You must define this port to enable the system to perform media steering and NAT operations.
realm id	Identifies the steering pool’s realm. The steering pool is restricted to only the flows that originate from this realm.

Note:

The combination of entries for IP address, start port, and realm ID must be unique in each steering pool. You cannot use the same values for multiple steering pools.

Each bidirectional media stream in a session uses two steering ports, one in each realm (with the exception of audio/video calls that consume four ports). You can configure the start and end port values to provide admission control. If all of the ports in all of the steering pools defined for a given realm are in use, no additional flows/sessions can be established to/from the realm of the steering pool.