Abstract: A hotline system for the purchase of parking spaces comprises a parking space payment device, which device includes a screen, display means for displaying data on the screen, and a computer-based hotline device connected to the payment device via a data transfer connection, comprising a receiver for receiving operational data received from the payment device and a transmitter for transmitting to the payment device control signals for controlling the payment device. The hotline device and the payment device each include a radioelectric transmitter-receiver, whereby the hotline device and the payment device are connected via a radioelectric connection, in the absence of a wired data transfer connection between the hotline device and the payment device, and in that the hotline device includes simulation means for simulating, based on the operational data received, the behavior of the payment device.