In traffic processes in a telecommunication system there is internal communication between service controlling entities which may belong to logical nodes in the same or different applications. Such a service controlling entity may be a service process controlling a service for a party of a call. The communication between the service controlling entities is controlled by rules given in a generic protocol. These rules imply lack of messages and use only of protocol parameters in the form of indivisible information transmission elements. Based upon the generic protocol, service protocols are specified, each corresponding to its service, and a protocol managing entity within an application handling the protocol management of a certain service according to the service protocol. The information elements are distributed by a communication service having a parameter distribution function for the protocol parameters, by transferring data between the protocol managing entities.