DE3336096A1 - Circuit arrangement for controlling call diversions between subscriber installations of various centrally controlled telecommunication systems with a common central signal channel - Google Patents

Abstract

The invention relates to a circuit arrangement for controlling call diversions of subscriber installations of various centrally controlled telecommunication systems, in particular telephone switching systems, within one or more communication networks which are connected by a central signal channel. In the case of call diversions between the telephone switching systems (FVAU and FVAZ), connection path identifications, which form the holding criterion for already existing connection paths, are added to the call diversion address stored in the subscriber memory (TSP) in order to avoid cases of paths being busy. Such call diversions are used in special networks, in particular for energy supply companies. <IMAGE>

Description

Circuit arrangement for controlling call forwarding

gen between subscriber facilities of different centrally controlled Telecommunication systems with a common central signal channel The main patent (P32 30 653.9) relates to a circuit arrangement for controlling call forwarding from subscriber equipment various centrally controlled telecommunications systems, in particular core voice exchanges were within one or more communication systems connected to a central Character channel are in communication, the central control device of a respective Telephone switching system an authorization of the subscriber facilities of the respective telephone exchange system containing identification data memory and a Originating and call forwarding addresses of call forwarding activating subscriber devices are assigned to storing subscriber memories> and the central control devices of the core telephone exchanges can be connected to one another via the central signal channel and the call forwarding address from the subscriber memory are related with the result of the authorization check in the identification data memory of the central control device the subscriber device activating the call forwarding via the central character channel can be acknowledged on a result-related basis, the call forwarding address in the case of call forwarding can be activated by external subscriber devices in such a way that a feedback the call forwarding address to the originating telephone exchange is made, and the feedback within the originating telephone exchange system for through-connection an optimal connection path to the telephone exchange target system controllable is.

Telephone exchanges of the type defined at the outset provide that within one or more communication networks in per se independent of one another Telephone exchanges between the subscriber facilities located there Call forwarding can be done. Call diversions are from the subscriber facilities for example switched when the subscriber facilities are temporarily staffed are not busy, but the call connections to the unoccupied subscriber equipment are to be temporarily perceived by other participant facilities.

Subscriber facilities that divert calls to another Subscriber equipment switched within its own telephone exchange can use this switching measure to avoid annoying calls, for example during conferences or meetings. Own call connections are however still possible and independent of the switching status of the call forwarding.

Increasingly for special telephone systems, in particular for special networks of energy supply companies, several telephone exchanges summarized in a communication network and the subscriber devices from different communication networks with convenient operation options, such as call forwarding to any subscriber facility.

The object on which the invention is based is to provide a circuit arrangement to specify that ensures that route bestzfalls, particularly in the case of call diversions in connection with transfer after consultation or in the case of transit connections through operator consoles initiated, are largely avoided. Invention appropriately this is achieved by combining features 1.1 to 1.3.

It is to be regarded as essential for the invention that the call forwarding address is expanded by the additional information of the connection identifier, which at the same time serves as a stopping criterion for the already existing connection path. So that will first in each case the existing connection path between the different ones Telephone exchanges regardless of the different route connection, which are controlled by the routing. Occurring in between Route occupancy in the communication network can therefore not block call forwarding. On the other hand, however, the optimal connection of the connection paths in the communication network remains received when the corresponding required connection paths can be assigned and the original connection identifier from the route search with routing Detected detour identifier can be replaced.

The invention is shown in a figuratively illustrated embodiment explained in more detail, with only the switching devices necessary for understanding the invention and control lines are shown in extracts.

In the figure, the originating telephone exchange is FVAU and the telephone exchange target system FVAZ shown as a selection from one or more communications networks, any telephone exchange represent. These telephone exchanges each have the central through-switching network CSN, which in turn can be connected to one another via the voice channel SK. In addition, there are line groups in each case at the central switching network CSN LTG provided, via which the subscriber facilities TLR, TLG are connected. Each of the telephone exchanges FVA ... has the central control device CC to> those with the identification data memory KDS and the subscriber memory TSP communicates.

The central control devices CC are via the central character channel ZZK connected to each other.

Assume that the subscriber facility TLR is the originating telephone exchange FVAU the call forwarding to the subscriber device for the incoming calls TLG wants to switch the target telephone exchange system. When you pick up the handset the subscriber device TLR is in a known manner via the respective line trunk group LTG activated the central control device CC to the effect that via the central Character channel ZZK the original address and the call forwarding address from the Call forwarding activating subscriber device TLR to the telephone exchange target system FVAZ will be transferred.

The originating address and the call forwarding address are within the telephone exchange target system FVAZ is stored in the subscriber memory TSP and the call forwarding address in a known manner with the information content of the Characteristic data memory KDS compared.

Both the presence of the subscriber facilities are in the KDS identification data memory as well as their authorizations. In the event that the call forwarding receiving subscriber device TLG of the telephony exchange target system FVAZ exists and is authorized to receive call forwarding. is from the central control device CC of the telephone exchange target system FVAZ the call forwarding address with the statement "call forwarding accepted" as the acknowledgment signal over the central signal channel ZZK of the originating telephone exchange system FVAU communicated. The subscriber facility TLR of the originating telephone exchange initiating the call diversion FVAU receives the acknowledgment of the call forwarding acceptance by an appropriate acoustic signal.

All incoming calls for call forwarding initiating subscriber device TLR are now automatically from the central control device CC by setting up a new connection path to the telephone exchange target system FVAZ diverted, with the destination information in the subscriber memory TSP of the telephone exchange ~ originating system FVAU is stored.

For telephone exchanges in special special networks Can be connected to one another via several trunk groups - so-called detour traffic are, it is provided that with the incoming call connection to the call forwarding initiating subscriber device TLR from the central control device CC of the originating telephone exchange FVAU is first asked for the response of the call forwarding address. With the Acknowledgment of the call forwarding address from the target telephone exchange FVAZ to the original telephone exchange system FVAU can from the central control device CC of the telephone exchange origination system FVAU when there are several connection paths for the telephone exchange target system FVAZ now in a known manner the optimal one The connection path can be selected and switched through via the voice channel SK.

The call forwarding address supplemented by the connection identifier, which then defines the existing connection path in the event that the route search does not result in an optimal connection route found to be free.

The transfer of the call forwarding address to the respective subscriber memory ISP ensures that the subscriber device selected for call forwarding is only - in the example the participant facility TLG - not by own Call forwarding can control so-called call forwarding chain connections and thus at least to partial blockages of the speech connection paths between the individual Telephone exchanges FVA ... can lead. Failure to answer the call forwarding is in a known manner the subscriber device that has already been forwarded to a call forwarding TLG communicated acoustically.

1 Figure 1 claim

Claims (1)

Circuit arrangement for controlling call diversions from subscriber devices of various centrally controlled telecommunications systems, in particular telephone switching systems, within one or more communication systems that are connected to a central character channel, the central control device of a respective telephone exchange system having an identification data memory containing the authorization of the subscriber systems of the respective telephone exchange system and an origin - and call forwarding addresses of call forwarding activate the subscriber devices are assigned to storing subscriber memories, and the central control devices of the telephone switching systems can be connected to one another via the central character channel, and the call forwarding address from the subscriber memory in connection with the result of the authorization check in the identification data memory of the central control device activating the call forwarding Subscriber facility can be acknowledged result-related via the central character channel; The call forwarding address can be activated in the case of call forwarding by external subscriber devices in such a way that the call forwarding address is returned to the telephone exchange originating system, and the confirmation within the telephone exchange originating system for switching through an optimal connection path to the telephone exchange target system controllable; according to patent P 32 30 653.9 characterized by the combination of features 1.1 the call forwarding address can be expanded by a connection route identifier that is present in addition to a first subscriber device (TLR) and a second subscriber device (TLG), 1.2 the connection route identifier is used as a hold criterion for the existing connection route between the the first subscriber device (TLR) and the second subscriber device (TLG) can be evaluated, 1.3 the connection route identifier can be replaced by a changeover identifier which becomes effective during the route search through routing.