A method of configuring an arrangement has a computer system and a telephone installation, wherein the computer system connects to the telephone installation via a data interface and wherein the computer system and the telephone installation can assume at least one first and one second operating state, including generating control data with a control unit in the computer system depending on a change in operating state of the computer system, from the first operating state into the second operating state, exchanging the control data between the computer system and the telephone installation via the data interface, setting up one or more parameters for the second operating state of the telephone installation with a configuration unit in the telephone installation depending on the control data exchanged, and changing the operating state of the telephone installation from the first operating state into the configured second operating state set up.