A method for establishing a videoconferencing connection between a first television set and a second television set, wherein the first television set is associated with a first telephone number and the second television set is associated with a second telephone number, and wherein the first television set is registered in a first communication network, said method comprising: Transmitting a connection request (201, 301) with the second telephone number from the first television set to establish a communication connection with the second television set; Determining whether the second television set is registered in the first communication network; Forwarding (503, 202a, 203) the connection request to the second television set and acceptance of the connection request by the second television set to establish the videoconferencing connection, if the second television set is registered in the first communication network; otherwise: Locating a second communication network based on the connection request and forwarding the connection request to the second communication network; Retrieving the subscriber data of the second television set from a second subscriber data server in the second communication network based on the connection request; Forwarding (506, 306, 307) the connection request to the second television set based on the subscriber data of the second television set and acceptance of the connection request by the second television set to establish the videoconferencing connection, if the second television set is registered in the second communication network; and Registering the second television set in the first communication network; wherein the first communication network comprises a first proxy server, a first connection server, a first query server and a first subscriber data server; and wherein registering the second television set in the first communication network comprises entering the second telephone number in the first subscriber data server, in order to publish the second telephone number in the first communication network. Transmitting a connection request (201, 301) with the second telephone number from the first television set to establish a communication connection with the second television set; Determining whether the second television set is registered in the first communication network; Forwarding (503, 202a, 203) the connection request to the second television set and acceptance of the connection request by the second television set to establish the videoconferencing connection, if the second television set is registered in the first communication network; otherwise: Locating a second communication network based on the connection request and forwarding the connection request to the second communication network; Retrieving the subscriber data of the second television set from a second subscriber data server in the second communication network based on the connection request; Forwarding (506, 306, 307) the connection request to the second television set based on the subscriber data of the second television set and acceptance of the connection request by the second television set to establish the videoconferencing connection, if the second television set is registered in the second communication network; and Registering the second television set in the first communication network; Locating a second communication network based on the connection request and forwarding the connection request to the second communication network; Retrieving the subscriber data of the second television set from a second subscriber data server in the second communication network based on the connection request; Forwarding (506, 306, 307) the connection request to the second television set based on the subscriber data of the second television set and acceptance of the connection request by the second television set to establish the videoconferencing connection, if the second television set is registered in the second communication network; and Registering the second television set in the first communication network; wherein the first communication network comprises a first proxy server, a first connection server, a first query server and a first subscriber data server; and wherein registering the second television set in the first communication network comprises entering the second telephone number in the first subscriber data server, in order to publish the second telephone number in the first communication network.