SIP Proxy Subscriptions

When the Oracle® Enterprise Session Border Controller operates in dialog mode (i.e., as a B2BUA), it creates and maintains dialog state for subscription dialogs created with SUBSCRIBE/NOTIFY messages and for INVITE-initiated dialogs. Since there can be a very large number of subscriptions per user in a Rich Communication Services (RCS) environment (especially for presence subscriptions), Oracle® Enterprise Session Border Controller resources can quickly become depleted.

To alleviate this consumption of resources, you can configure your Oracle® Enterprise Session Border Controller to operate in proxy mode for event packages that you define using the proxy-sub-event parameter in the global SIP configuration. When you define event packages in this list and the operation mode for the SIP configuration is dialog or session, the Oracle® Enterprise Session Border Controller processes all SUBSCRIBE and NOTIFY requests and responses for the designated event packages in transaction stateful mode.