Number Translation Implementation

Oracle® Enterprise Session Border Controller number translations are implemented in three steps. First, the individual number translation rules are defined in the translation rules subelement. Next, the established rules are grouped in a specified order to apply to calling and called numbers. This second step occurs in the session translation element. Finally, session translations are attached to either session agents or realms in the session agent element or realm configuration element.

Number translations attached to session agents take precedence over number translations attached to realms. If no number translation is applied to a session agent, then the Oracle® Enterprise Session Border Controller will use the number translation applied to a realm. If a number translation is applied to both a realm and session agent, the translation attached to the session agent will apply. If session agents and realms have no associated translations, then all numbers will remain in their original forms as they pass through the Oracle® Enterprise Session Border Controller.

Within each realm or session agent, the number translation is applied to either the incoming or outgoing call leg. This distinction between incoming and outgoing calls is made from the point of view of the Oracle® Enterprise Session Border Controller. The following diagram illustrates the number translation concept.

The following table shows you which parameters to apply a session translation ID in order to affect the corresponding leg of the call as shown in the illustration.

Leg	Calling SA	Called SA	Realm A	Realm B
A	IN Translation ID		IN Translation ID
B		OUT Translation ID		OUT Translation ID