Abstract: In current telecommunications services, it is usual for the service provider of the initiator (e.g. the caller or the A-side) of the communications connection to determine the price and charge the A-side accordingly. The other subscribers are not usually charged. The A-side service provider pays a compensation amount (balance) to the B-side service provider. This fee charging and payment system is too rigid for modern communications services. The inventive method solves this problem.

Abstract: The invention relates to a method for updating software (sof) in different terminals (PEC, PAL), which are connected to a communications network (NET), said network allowing communication between the terminals. On request, the software state of software (sof) that is running on one of the terminals (PEC) is transmitted to the second terminal (PAL) via the communications network (NET) and software that is running on the second terminal (PAL), which corresponds to the software (sof) on the first terminal (PEC), is provided with the transmitted software state and continues to run on the second terminal (PAL) with the last current state of the first terminal (PEC). The software used is, for example, an agent software.

Abstract: A method in which two terminals operated on a data transmission network store at least one electronic credit. With the aid of the credits, charge metering is performed. The electronic credits are transmitted with credit messages to control units, which check the validity of the credits and, depending on the result of the check, clear network resources.