A method for operating a system with an elevator system and an interface for communication via a communication network, wherein the elevator system comprises an elevator control, an elevator car and a drive unit, which moves the elevator car between floors (L1, L2, L3) of the building upon activation by the elevator control, wherein a camera is arranged in the elevator car in order to produce a camera recording of an interior of the elevator car, and wherein the method comprises the steps of: receiving a first input signal by means of the interface, which is communicatively linked to the elevator control and the camera, wherein the interface has a processing unit and a transmitting and receiving unit in order to communicate with a communication device of a host and a mobile device of a visitor via a communication network, and wherein the first input signal indicates that the host initiates a movement of the elevator car to a first defined floor (L1, L2, L3), on which the visitor would like to enter the elevator car, by means of an input on a communication device; generating a first elevator control signal by means of the processing unit of the interface based on the first input signal; transmitting the first elevator control signal to the elevator control by means of the processing unit of the interface in order to initiate the movement of the elevator car to the first defined floor (L1, L2, L3); receiving a camera recording of the interior of the elevator car by means of the interface once the visitor has entered the elevator car; transmitting the camera recording to the communication device by means of the interface via the communication network; receiving a second input signal by means of the interface via the communication network, wherein the second input signal is generated in that the host initiates a movement of the elevator car to a second defined floor (L1, L2, L3), on which the visitor would like to exit the elevator car, by means of an input on the communication device; generating a second elevator control signal by means of the interface based on the second input signal; and transmitting the second elevator control signal to the elevator control by means of the interface in order to initiate the movement of the elevator car to the second defined floor (L1, L2, L3). receiving a first input signal by means of the interface, which is communicatively linked to the elevator control and the camera, wherein the interface has a processing unit and a transmitting and receiving unit in order to communicate with a communication device of a host and a mobile device of a visitor via a communication network, and wherein the first input signal indicates that the host initiates a movement of the elevator car to a first defined floor (L1, L2, L3), on which the visitor would like to enter the elevator car, by means of an input on a communication device; generating a first elevator control signal by means of the processing unit of the interface based on the first input signal; transmitting the first elevator control signal to the elevator control by means of the processing unit of the interface in order to initiate the movement of the elevator car to the first defined floor (L1, L2, L3); receiving a camera recording of the interior of the elevator car by means of the interface once the visitor has entered the elevator car; transmitting the camera recording to the communication device by means of the interface via the communication network; receiving a second input signal by means of the interface via the communication network, wherein the second input signal is generated in that the host initiates a movement of the elevator car to a second defined floor (L1, L2, L3), on which the visitor would like to exit the elevator car, by means of an input on the communication device; generating a second elevator control signal by means of the interface based on the second input signal; and transmitting the second elevator control signal to the elevator control by means of the interface in order to initiate the movement of the elevator car to the second defined floor (L1, L2, L3).