Reverse Invocation (RVI) queue (also referred to as gateway) processing links two or more iWay Service Manager (iSM) instances in a message receiver or a message executor relationship to tunnel through secure firewalls.

To configure RVI queue (gateway) processing, you must:

1. Install the iWay Gateway extension on the iWay Proxy server and the execution engine.

   To install the iWay RVI Proxy, you must add the Gateway extension to your iSM instance during the iSM installation. For more information on installing iSM, see the iWay Installation and Configuration Guide.

   After the Gateway extension is installed, the RVIAttach listener, RVIGateway listener, and RVI Relay service are added to the design-time registry and run time configurations.

2. Configure the RVIAttach listener on the iWay Proxy server.
3. Add the RVI Relay service to the appropriate listener(s) configured on the iWay Proxy server.
4. Configure the RVIGateway listener on the execution engine.

RVI queue processing is now documented extensively in the iWay Cross-Channel Services Guide, which also describes how to:

• Configure the RVIAttach listener.
• Configure the RVI Relay service.
• Configure the RVIGateway listener.
• Configure a service to test the reverse invocation.