Abstract: In a method for processing a network service request, a first network element that is logically closest to a user requesting the network service manages a file into which data can be entered in respect of a user authorization to receive the network service. A network element includes a device for allowing and blocking transmission of a network service to a user requesting the network service. The device can be switched in accordance with the authorization data contained in the data memory.

Abstract: A method and a device for processing data on a connection between two nodes of a communication network. A first node conveys first data of a first size to a second node. The second node conveys second data of a second size to the first node. The first node determines a first time based on a duration from when the first data is sent until the second data is received. The first node conveys third data of the second size to the second node. The second node conveys fourth data of the first size to the first node. Then the first node determines a second time based on a duration from when the third data is sent until the fourth data is received. A communication system includes at least one such device.

Abstract: In a method for processing a network service request, a first network element that is logically closest to a user requesting the network service manages a file into which data can be entered in respect of a user authorization to receive the network service. A network element includes a device for allowing and blocking transmission of a network service to a user requesting the network service. The device can be switched in accordance with the authorization data contained in the data memory.

Abstract: The invention relates to a method for establishing a communication link. According to said method, to establish said link, a communications unit transmits at least one message that initiates the establishment of the communications link in at least one communications network and at least one corresponding confirmation is transmitted with the aid of a broadcast transmission method in the direction of the initiating communications unit. The information that represents the initiating communications unit is stored in the communications network or networks. The confirmation(s) that has or have been transmitted with the aid of the broadcast transmission method is detected and target information that is contained in said confirmation is compared to the stored information. If the compared information agrees at least partially, the confirmation(s) is or are routed to the initiating communication unit represented by the communication unit.