The invention is concerned with a method in a communication network for invoking
services, the communication network comprising at least one or more terminals and
at least two service entities. In the method the terminal deduces necessary support
and service components for providing an end-user service. A set of configuration
requests is the constructed at the terminal, each associated with one or more specific
service entities for invoking individual service components composing a service.
Each configuration request is forwarded from the terminal to the service entity/entities
indirectly, by using a special network support function for configuring service
entities-the assembler unit of the invention-or directly in a way, which is chosen
in accordance with pre-defined criteria. The invention is also concerned with a
communication network, a terminal and an assembler unit to perform the method.