Features available in one communication installation of a communication
system are made available system-wide by transmitting an item of feature
control information for a subscriber line of a first communication
installation to a second communication installation. The item of feature
control information is converted into at least one function call, whose
associated function is provided by a computer telephony integration (CTI)
interface. The function call is transmitted via the CTI interface to the
first communication installation. At least one feature control
instruction contained in the function call is executed by an
administration and maintenance device of the first communication
installation. The first communication installation depicts a controlled
instance with regard to a feature control, while the second communication
installation depicts a controlling instance. This makes it possible to
render a feature control existing in the second communication
installation usable for the first communication installation.