Method of providing a dial-in function in telecommunication systems

The present invention relates to a method of providing a dial-in function in telecommunication systems (TC systems) that have no direct dial-in capability to extensions using dedicated extension numbers. A method and a device are described for providing or simulating a direct dial-in function by providing an extension dialing function in telecommunication systems that have no direct dial-in capability with dedicated extension numbers. The dial-in capability is implemented in that an incoming call is automatically received by the TC system, the user is automatically prompted, via an audio user message, to input extension dialing commands, these extension dialing commands are automatically assigned to an extension and with this assignment information an electronic forwarding signal is generated, which causes the TC system to switch the incoming connection to an extension. This forwarding signal simulates the control signal generated in manual forwarding between the extensions of the TC system. The device for performing the method is integrated as a circuit arrangement in a TC system or designed as an adaptive device retrofitted on existing TC systems.