Throughout the 20th century, telephone switchboards were devices used to connect circuits of telephones to establish telephone calls between users and/or other switchboards. The switchboard was an essential component of a manual telephone exchange, and was operated by switchboard operators who used electrical cords or switches to establish the connections.
In computer networks, a reverse proxy is a type of proxy server that retrieves resources on behalf of a client from one or more servers. These resources are then returned to the client, appearing as if they originated from the server itself.

services available on the sandbox switchboard