DE3644228C2 - - Google Patents

Description

The invention relates to a method for call forwarding according to the preamble of claim 1.

The "call forwarding" feature is known. Here Calls that are intended for the first terminals are set redirection destination. With the well-known Features can have multiple call forwardings to a destination different participants (Siemens product brochure: System Hicom 600, order no. A19 100-K3161-G430-01, Page 38).

The private branch exchange known from this product publication is designed in such a way that an extension line a common number (uniform communication number) assigned to all internal communication services (e.g. voice, fax, etc.) can be (page 6 of the publication).

In today's switching systems, the z. B. over Btx-, Data, fax or teletext terminals can have certain terminals different person-specific Numbers can be assigned to costly communication terminals e.g. B. to be provided only departmentally, but each employee under his personal Call number also z. B. can be reached by fax.

From the German patent DE 28 11 059 C2 already a procedure for handling functional processes depending on a certain memory allocation in a data memory of a centrally controlled telephone switching system known. Both can be free selectable as well as a predefined call forwarding be activated, but with a chain of Subscriber stations with the two different types is prevented by call forwarding.  

From German published application 28 11 042 a method is already known in which in the case of interlinking call forwarding by comparing A call forwarding from a source and destination the first subscriber station triggering the call forwarding via further subscriber stations back to the first subscriber station is prevented.

From the German patent DE 28 17 985 C2 already a procedure for private branch exchanges known with features for rerouting calls. Here it is provided that a switching center has information is fed that the connection with which the operator console is currently connected by a Reversal carried out automatically by the system has been.

From European patent application 0 066 668 A1 already a method of operating a telephone system known, in a connection several user-specific Numbers can be assigned. When calling an individual The phone number becomes one for the desired subscriber characteristic call signal in the corresponding multiple access line prompted.

The object of the present invention is a Specify the procedure of the type mentioned above, the further Refinements of the "call forwarding" feature.

This object is achieved according to the present invention solved the features of claim 1. As essential for the invention is to be seen that for terminals to which different Numbers are assigned to both individual numbers Call forwarding as well a global all call diversions assigned to the terminal device is created. This enables connections  to end devices, such as B. Fax machines only departmentally are once provided, e.g. B. in the absence of the responsible Redirect operator (secretary) to other end devices, without multiple call number-specific call forwarding is to be made.

The invention is described below with reference to a drawing illustrated embodiment explained in more detail. It shows

Fig. 1 shows the basic structure of a centrally controlled switching system and

Fig. 2 and Fig. 3 shows examples of lists according to the present invention.

Fig. 1 shows a centrally controlled switching system, which consists essentially of the switching network KN and the central control ZSt. In the exemplary embodiment shown, the subscribers Tlna, Tlnb and Tlnc are connected to the coupling network KN in addition to a public telephone network ÖN. The subscriber station Tlna has a normal voice terminal, a fax and a teletext terminal. The fax terminal of the subscriber station Tlna is also assigned the call number of the two subscriber stations Tlnb and Tlnc, while the teletext terminal of the subscriber station Tlna is additionally assigned the call number of the subscriber station TlnB.

The central controller is assigned a memory unit ZSt Sp, the construction shown in Fig. 2 and Fig. 3 are stored in the lists provided. The structure of the first and the second list corresponds to the structure of the list shown in principle in FIG. 2. This means that depending on the type of communication used, each call number is assigned a specific connection location, which identifies the physical connection of the station to the switching system.

The first list shows the assignments between the phone number and the connection locations that are valid for the normal operation of the switching system without activated call forwarding, that is, that correspond to the static configuration of the switching system. The list shown in FIG. 2 corresponds to the configuration of the switching system shown in FIG. 1. This means that the subscriber station TlnC with the number 5002 is assigned the voice communication relating to the connection position z and the connection position m for a fax service. For a fax service, the subscriber stations TlnA, TlnB are also assigned the connection position m, as can be seen from FIG. 1.

In the second list, which is basically like the first list is set up, there are only entries for each phone number about the connection position when call forwarding is activated. Is it assumed that the subscriber station Tlnc  a call forwarding regarding voice communication Participant station Tlna is desired, is located at only one entry in the second list in these circumstances. In this entry the number 5002 is under the communica Language type assigned to the Alx connection location. The sequence when establishing the connection is such that first using the first list which the normal number of the desired number orderly connection position is determined after determination of this existing due to the configuration of the switching system Connection position is checked whether in the second list under the desired number in association with the corresponding Communication type there is an entry. Is there in this If there is an entry in the second list, the Connection to the connection location specified in this entry built up. If there is no entry in the second list, then the connection to the connection specified in the first list location built.

The type of call forwarding described so far is also called Call number call forwarding is known and is known. In which The inventive method for call forwarding is in the a third is assigned to the central control ZSt List filed, in each case a predetermined connection position a certain other connection location can be assigned. The actual connection establishment in the method according to the invention takes place only after querying this third list. This means, First, the list that normally exists is based on the first list Assignment between the dialed number and its connection location determined for a certain type of communication. Then over checks whether there is a call diversion. this happens based on the second list as described above. To In any case, query of the second list becomes either the from the first list determined connection location or to the  the second list determined connection location, checked whether a additional connection location assignment according to the third list is present. In the event that such a connection location assignment the connection is established accordingly.

Claims (2)

1.Method for call forwarding in switching systems with a central control (ZSt) and a memory unit (Sp) assigned to it, in which the first assignment data for subscriber stations (TlnA, FAX, Ttx, TlnB, TlnC) are stored, which assign the subscriber stations ( Specify TlnA, FAX, Ttx, TlnB, TlnC) assigned numbers and physical addresses (Alx, Alm, Aln; Aly, Alm, Aln, Alz, Alm) of the respective subscriber line, whereby several physical numbers are assigned to one physical address (Alm, Aln) can, and in the second assignment data can be stored, which, when call forwarding is activated, indicate an assignment between a first subscriber station addressed by a calling subscriber and a second subscriber station forming a call forwarding destination, characterized in that third assignment data are stored in the memory unit (Sp) an assignment between a physical address (Alm), the multiple R Call numbers can be assigned and each indicate a further physical address (Alo) that the central controller (Zst) checks when establishing a connection, whether there is a second assignment date based on the number on which the connection is based, that the central controller (Zst) continues to establish a connection Checks whether there is a further physical address (Alo) based on a first physical address (Alm) specified by the first assignment date or a second physical address specified by a possibly existing second assignment date, that the central controller (Zst) provided no further physical Address (Alo) is present, the connection to the subscriber station determined by the first physical address or, if there is a second physical address, to the subscriber station determined by the second physical address, and that the central controller (Zst), if e There is a further physical address (Alo) which establishes the connection to the subscriber station determined by the further physical address (Alo). 2. Switchboard for the implementation of the procedure Claim 1 characterized, that the control (Zst) of the switching system a Method defining control program is assigned.