Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the possibility of breaking-in.

p0001The invention relates to a method for performing a service feature-specific control procedure in connection with the possibility of a computer-controlled communications system, particularly a key communications system, a subscriber who is in a call connection to announce a concerned him urgent call request by it, ostensive attention sign (Waiting ), where for the connection of a terminal equipment to the communication system of a transmission of useful serving useful connection and, in addition, a control connection is switched, can be transmitted via the respective information which is formed inter alia due to the incentives derived during the actuation of keys.

p0002Modern communication systems designed are capable not only to the actual switching control, but also to a control or realization of additional over and beyond the actual switching process control operations. Such additional functions are generally referred to as features, where a large number of different performance characteristics is known. Such features can be introduced either in documents of the switching device or during an existing call connection. This can be done for example by the choice of certain numbers or number combinations, or by the operation of so-called function keys. Such features include, for example, audio cues for waiting users, preventing unwanted connections, call forwarding and automatic call waiting. By means of this last performance feature, for its activation the subscriber has pre-handling at its terminal or which can also be initiated automatically after a specified time after dialing a busy subscriber location, a located in-one voice call participants should be informed that another subscriber wishes to speak to him urgently. For this, a warning tone will be activated and / or displays this connection request on the display of the requested subscriber terminal associated with the existing connection. Usually, the requested subscriber can answer the call waiting by replacing the handset. In this Anklopfzustand then for the control computer provides the information to establish the connection between the requesting and requested the subscriber station.

p0003The requirement provided according Nutzverbindungsmöglichkeit and of separate control of connection can be implemented separately as a useful channel or a control channel on the same physical transmission medium by different time slots. but you can also be formed by two pairs of wires. For a key communication system in which, for example, the individual terminals are connected via two independent and one each user connection and forming a control connection pairs in a star shape to the communication system, it is known to provide additional circuit- or subscriber-specific keys in addition to the normal keypad. Through their actuation occurs immediately an assignment of the associated cable and connect between the respective terminal and another internal subscriber station. Further, in such a communication system at each terminal of the call processing state of all the rest of the terminals and the status of the individual external lines is displayed. In addition to viewing through optical display elements, which are directly associated with the individual function keys and are usually integrated into this, the subscriber can also visual cues in the form of an indication appears on the present on the terminal display.

p0004It is the object of the invention to enhance the function options in connection with the feature "call waiting" and to simplify the handling for the requested subscriber.

p0005This is achieved by the fact that the answer to the transmitted connection request signaling information is transmitted exclusively by the actuation of a corresponding function key to be located in the working position associated terminal to the computer control that with further existing requirement automatically due to this signaling information, by transferring the existing connection a connection state, which allows a continuation of the previous conversation at a later time again, a call connection with the requesting subscriber station is effected.

p0006With a single touch of this lifting corresponding function is thus with the handset lifted or upon further activation is therefore the call allows the requesting station and simultaneously ensures that the original call connection can be re-entered. This is possible according to the invention then, if the connection is transferred to the original caller on hold. It can be prepared so after the completion of the requested call again the original two-party connection. This transfer on hold may be limited to existing external call connections. The requesting station can be hooked up directly in accordance with an embodiment of the invention in the manner of a conference connection to the existing call connection by the key operation. After exiting the requesting party from the conference call, the original two-party connection should be continued. When the function key to the requesting subscriber associated subscriber key to be programmed. Assuming an existing Inter connection is made when activated the additional connection of the requesting party. Participants button this requesting party is identified by a specific signal state of the coupled with this key optical display device.

p0007The inventive method is explained with reference to a figure.

p0008The figure shows a schematic diagram of a telephone switching device VE, are connected in a star shape to the subscriber terminals Tl ... Tn. The voice transmission is to be carried out in the exemplary embodiment in an analogous manner. For the connection of terminal equipment is a four-core connecting cable is used, each consisting of a user connection, the representative voice pair a / b and a control connection performing signaling pair c / d. In an exclusively digital switching system, the control connection and the time allotted for the transmission of voice information useful connection to a two-wire connecting line would be implemented, in which case at least one traffic channel and a control channel for each terminal is formed by a specific time slot.

p0009For essentially procedural adapting the subscriber terminals Tl ... Tn are connected via a Anschalteeinheit AT, which also includes the call appearance with the electronic switching network KN. For leading to a public exchange OV or to a private power lines L, this is done via the Anschalteeinheit AL. The control functions of the system responsible for the central control computer unit ZSt that via a system bus SB with a spoke pure unit SE, said Anschalteeinheiten AT or AL and the other system components, such as the coupling device CN, one serving for the formation of multi-frequency code character unit MZ and a connected for the generation of audible tones competent unit HZ. The tasks of the central control computer unit are distributed in the exemplary embodiment on two processors. The processor ZP is intended for example, the call processing control and by the processor DP is to be the signaling processing with the involvement of a transmitter section S and a receiving portion E containing processing units Ve. Such processing unit Ve is any signaling pair c / d assigned.

p0010About this signaling wires c / d, a mutual information transmission between a terminal T and the central control computer unit ZSt is made. As displayed for the individual functional components terminal Tl is indicated, additional function keys Tf may be present in a key set Ts in addition to the number keys Tw the keypad. Upon actuation of circuit- or subscriber-specific keys can immediately an assignment of the respective line, eg. As the external line L, carried out and it can connect to be made to an internal subscriber. The communication system VE should be a key system, in which therefore appears at each terminal of the switching-oriented state of all the other terminals and the availability status of each external lines. As display elements, for example light-emitting diodes can be used, which are integrated into the respective function keys Tf. The transfer of information from the central control computer unit ZSt the switching device to the individual terminals Tl ... Tn may relate, for example, setting information for these light elements, which can lead to different light conditions. This involves analyzing the in each terminal EXISTING which control unit PE. In the embodiment of the switching device VE to a terminal device via the signaling wires c / d transmitted information to be transmitted by a binary voltage modulation and in the opposite direction to be transmitted by a binary modulation current. With the latter, for example, the changes made to the respective terminal actuation of individual keys is then signaled. This should be done in connection with the control unit PE by the unit IR. The information bits appearing at the respective signaling conductors in the opposite direction because of the provided voltage modulation can be recorded in cooperation with the control unit PE by the unit UD. They lead to appropriate control of said light elements LF. In addition or instead of these light-emitting elements can also be made a corresponding display on a display provided on the terminal DL. This display DL are also display certain information in connection with the construction and the recoupling of a compound for the subscriber. For example, the funds earmarked for an optical user guidance brief information texts can be displayed on this display.

p0011About each pair a / b, the voice information is transmitted. With this speech wires the speech circuit SP is connected. It is used in connection with the handset HA of the processing of the transmitted voice information and forms the termination.

p0012Such switching device is known in its basic structure. So Needless extent a detailed presentation of the circuit implementation and a description of what happened during connection and disconnection. Suffice it to say that the processors ZP and DP via the system bus SB to access the data stored in the memory means SE. These relate, inter alia, that stored in the memory P entire system program and belonging to him and contained in memory A operational data. In the storage part KD customer data is stored. These include, for example, the individual subscriber terminals allocated allowances for the use of certain features. Configuring this data can for example, via the input keyboard as a definable operating terminal terminal.

p0013For the realization of performance-feature-specific control procedures, the control computer unit ZSt includes individual program controls the access to the control data contained in the respective memories. So is, for example, be possible for the communications system VE, one is located in a voice call participants to announce their own urgent call request. This so-called "call waiting" is z. B. the fact that a particular alert is periodically displayed in the possibility for the desired subscriber call connection from the control computer unit ZSt. An appropriate message can be performed in the Display DL, who is also the identity of the call requesting party removed. The activation of this feature can be done by pressing a This feature assigned function key or by a code dialing. It can also be provided that after selecting encountered in busy state desired party this waiting is automatically after a specified time, initiated by the control computer unit, which monitors the individual compound phases. From that moment on, is sent to the. B. the name connected with the urgent call request information such as an appropriate reference tone will change for the requesting station until then fed busy in a special ringing tone. To prevent this participant is then informed that waiting is signaled.

p0014The requested participant now has the opportunity to respond by pressing a suitably programmed function key at his terminal call waiting another internal subscriber location and thereby enter without any further handling in a call connection with the subscriber station. There may be a special function key, a service key may be provided, if activated, could trigger various subsequent functions, depending on the existing switching state. By transmitted when the button is pressed in the state of existing for this subscriber station connection request their central computer control signaling information intercoupled switching procedures are accessed. The procedure-related control data are stored in the corresponding parts of the memory device SE. With the actuation of the service key in the Ts Anklopfzustand causing an existing external line connection is transferred into the hold state. So the question outside line receives a corresponding line termination. This can be done for example by the module MH. About this module can be loaded onto an in-holding state external line via the coupling device CN music. Pressing the button Ts simultaneously leads to a user connects to the requesting station. After completion of this conversation the participants requested in turn then has the option to return to its original voice call from hold in the call state. When connecting to the requesting station due to the key operation so the initial connection is maintained.

p0015It may be determined that this is the case only when an external call connection, while an internal call to answer call waiting is triggered with the service key. The preservation of the original call connection when connecting with a requesting party may also take place in that it is switched in the manner of a conference connection to the existing call connection. This can be done independent of the service key by means of a further function key Tf, which is provided at each terminal for any other subscriber location. Data transmitted to associated with the operation of the requesting subscriber button in Anklopfzustand the computer control ZSt information is on the computer control ZSt associated switch controller implements a procedure by which the involvement of a conference set KO the requesting subscriber station is hooked up to the existing internal connection. The requesting agent can therefore occur in a call connection over the so-formed Conference connection with the subscriber requested by him. The subscriber in question associated subscriber key can be recognized that with such a button each coupled optical display device occupies a certain signal state. After exiting the requesting party of the conference call can then be continued, the original two-party connection.

p0016In the embodiment with TG of existing for the entire clock supply clock generator and with SV denotes the power supply serving unit.