Method for providing features to the user of a telephone, a central unit and a telecommunication system therefor

The invention concerns a method for providing features to the user of a telephone (HSA1,... HSAn, HSS1,... HSSm) that is connected to a central unit (CU) whereby, if said telephone (HSA1,... HSAn, HSS1,... HSSm) is currently not interconnected via the central unit (CU), said telephone (HSA1,... HSAn, HSS1,... HSSm) notifies the central unit (CU) at least about certain kinds of user activities, in case of such notification the central unit (CU) checks whether it is currently interconnected to another telephone assigned to the same subscriber as said notifying telephone (HSA1,... HSAn, HSS1,... HSSm) and in case of the existence of such interconnection, the notifying telephone (HSA1,... HSAn, HSS1,... HSSm) is interconnected in parallel to this interconnection, and if said notifying telephone (HSA1,... HSAn, HSS1,... HSSm) is not a telephone for digital communication, the other telephone is a telephone for digital communication.