Abstract: To control the change, necessitated by the transmission of system information in the local information transmission loop, from a telecommunication channel—e.g. the Cf channel defined in the DECT standard—to a telecommunication channel—e.g. the Cs channel defined in the DECT standard, in a telecommunication subsystem which is tied into a telecommunication system as local information transmission loop—particularly a DECT-specific RLL/WLL subsystem tied into an ISDN system, the changing of channels is preferably initiated and performed by a time-limited interruption of the transmission of information in the telecommunication subsystem and subsequent resumption of the transmission of information.

Abstract: In a method for operating a connection in an ISDN network (NE) by integrating at least one DECT intermediate system (IS) in which, from the protocol of the connections, the triplet (terminal address (TE 1)/call identification (CR 2)/identifier of the transmission service (BC 1)) for each connection is stored in a list in the DECT intermediate system, it is provided that, upon the arrival of the confirmation (HOLD ACK) for the holding of a connection, this triplet (TEI 1/CR 2/BC 1) is marked; upon the arrival of a confirmation (RETR ACK) of the reactivation of a connection under the same terminal address (TEI 1), the marked call identification (CR 2) is searched for in the list; and then a DECT connection is made available, which connection corresponds to the identifier of the transmission service (BC 1) of the marked triplet (TE 1/CR 2/BC 1), and finally the marker (X) is erased again.

Abstract: In order to design a cellular cordless telecommunications system which makes it possible to implement a large number of performance features, for example synchronization, roaming, handover, internal links, hold, check-back, transfer etc. in the cellular cordless telecommunications system without any additional wire link between the cordless base stations in the cellular cordless telecommunications system, the cordless base stations are connected to an S0 bus (i.e., a basic access line for a multi-device configured system).

Abstract: To allocate telecommunication channels of different channel capacity, e.g. the ISDN D channel and DECT channels to one another (e.g. simulation of the ISDN channel structure by the DECT channel structure) with good (economic) utilization of the bandwidth and minimum technical complexity in a hybrid telecommunication system, particularly an “ISDN DECT-specific RLL/WLL” system, a DECT-specific Cs channel and a DECT-specific Cf channel are used in dependence on the amount of information transmitted on the ISDN D channel for transmitting information in the hybrid telecommunication system.

Abstract: When information is to be exchanged in encrypted or unencrypted form on a per call basis between ISDN terminal equipment (15, 16; 20, 21), that is, data terminals, terminals or telecommunications systems, under the condition that the ISDN basic call procedures are available at the interfaces but supplementary services are not yet available everywhere, then, following a phase produced during the course of the call setup wherein the network (14) has already setup a connection between the calling and the called cryptographic equipment, the cryptographic equipment instead of the network control the further course of the call setup. The B-channel connection that already exists is employed for the mutual control, that is, the D-channel procedures at the ISDN terminal equipment interfaces are imaged onto B-channel procedures at the network interfaces upon employment of an expedient in-band coordination. The method can be employed in conjunction with the utilization of cryptographic equipment in ISDN.