Back-to-Back Gatekeeper and Gateway
For peering connections where both networks use inter-domain gatekeeper signaling, the Oracle® Enterprise Session Border Controller is configured as a back-to-back gatekeeper proxy and gateway mode of operation. The Oracle® Enterprise Session Border Controller responds and issues LRQs and LCFs/LRJs acting as a routed gatekeeper. Peered gatekeepers send LRQ to the RAS address of one of the Oracle® Enterprise Session Border Controller’s virtual gatekeepers and it responds by providing its call signaling address that performs the gateway functions. Routing policies are used to determine the egress virtual gatekeeper that then exchanges LRG/LCF to determine the call signaling address of the terminating gateway.
The following diagram illustrates the back-to-back gatekeeper and gateway.
![](img/GUID-D25ECE1F-9883-4DD0-9448-07B64A1A3D11-default.jpg)