Abstract: It is disclosed a apparatus including transmitting a request message including first information being different from credit control information, second information indicating absence of a need for credit control, third information indicating a need for call charge indication, and fourth information concerning a service requested; and a method including transmitting an answer message including call charge information responsive to reception of the request message.

Abstract: The invention provides a method, including detecting, at a network element, a type of a supplementary service requested by a user equipment, sending, by the network element, a message containing the detected type of the requested supplementary service to a charging system, receiving, at the network element, a message including information related to the detected type of the requested supplementary service from the charging system. The present invention further provides a respective system and network elements.

Abstract: A method for the reverse signaling of a transmission service is used during a call from a first telecommunication network. A mobile terminal is called in the supply range of a target switchboard of a digital mobile radio network from the first telecommunication network, and the information completely describing the transmission service which is to be used is exchanged between the mobile terminal and the destination mobile switchboard of the digital mobile radio network, is stored in the destination mobile switchboard and is transported by at least one signaling message ADDRESS COMPLETE, ANSWER to at least one access mobile switchboard involved in the call which to be made, whereupon it is made available.

Abstract: Data transfer between a first subscriber having a first IP address and a second subscriber having a second IP address via a tariff-reduced data connection in a data mobile radio network is controlled by a functional unit in the data mobile radio network examining the authorization of the subscribers using the IP addresses of the subscribers involved in the data transfer.

Abstract: A method for the reverse signaling of a transmission service is used during a call from a first telecommunication network. A mobile terminal is called in the supply range of a target switchboard of a digital mobile radio network from the first telecommunication network, and the information completely describing the transmission service which is to be used is exchanged between the mobile terminal and the destination mobile switchboard of the digital mobile radio network, is stored in the destination mobile switchboard and is transported by at least one signaling message ADDRESS COMPLETE, ANSWER to at least one access mobile switchboard involved in the call which to be made, whereupon it is made available.