DE19522953A1 - Remote connection for telephone connections - Google Patents

Abstract

Remote connections are made between an exchange and a subscriber terminal. Additional information can be transmitted along with operational information after detection of the status of the connected subscriber. The exchange only allows transmission of operational data to the subscriber after checking to see if the information transmitted from the subscriber to the exchange matches the reference information. The exchange transmits an FSK request signal in reply to a first signal transmitted from the terminal.

Description

The invention relates to a method for producing Telecommunications connections according to the preamble of the patent saying 1.

From the European Telecommunications Standards Institute (ETSI) published draft, version: 4 of 15. December 1994, Work Item No. DE / SPS-03034 "Signaling Pro tocols and switching (SPS); SPS Protocol over the local loop for display (and related) services "is a so-called" off hook data transmission "procedure (Chapter 8.2). Da it is provided that a so-called terminal alarm signal (CPE alerting signal (CAS)) is used to the end device to signal that data transmission is to be expected.

In this connection, the following sequence of method steps is provided, which is shown in FIG. 1 of the present application (= FIG. 6 of the aforementioned design):

• - A switching center LE blocks a voice transmission to and from a remote subscriber station to avoid disruptions, which is characterized by a later alarm and data signal can result in a near-end subscriber location CPE to mini mate and prevent these signals from reaching the distance terminal participant reached;
• - A rest period Ta follows the voice transmission block tion;
• - If necessary, a subscriber alarm signal (SAS) from the switching center is sent to the terminal, which can be followed by another rest period Tb;
• - The exchange LE sends to the near-end subscriber set a signal CAS and wait for a confirmation supply signal ACK of the terminal CPE at least during egg  of the period Tc. The exchange recognizes none Terminal confirmation signal within a period T out, the signaling process is terminated and the Voice transmission resumed immediately;
• - an FSK data transmission (transmission of data that e.g. B. the phone number and the name of the B-subscriber be draw) from the exchange to the terminal, and after a period Td from receipt of the confirmation supply signal ACK from the terminal CPE;
• - after a period Te after the completion of the FSK data the transfer of voice data between the Remote subscriber and the exchange again be included.

In the context of this method, therefore, only data are transmitted from the switching center to the terminal ("FSK data transmission"), it also being provided that after the end of this data transmission, the transmission of voice data is resumed (see FIG. 6 of the draft: "Far-end speech transmission reestablishment"). Likewise, a resumption of the voice transmission is provided if the terminal does not transmit a confirmation signal to the switching device before the actual data transmission (“FSK da tatransmission”) Chap. 8.2., Point 4) of the draft).

The invention is based on this prior art based on the problem, a method of the aforementioned Specify the type of transmission of terminal and / or enables operator-specific identification data, the method being compatible with ETSI standards.

The invention has a number of advantages. The method according to the invention enables unauthorized Te telephone or an unauthorized message transmission through the entry of one or more terminal and / or be prevent personal identification data. The inventive method prevents  Telephone devices or other news terminals operated will be unauthorized to these devices agreed telecommunications sockets to be connected.

The invention will now be described with reference to the drawing.

It shows:

Fig. 1 is a sequence of method steps for transmitting FSK data between an exchange and a Nahteilnehmerstelle according to the prior art;

Fig. 2 process steps of the method according to the invention, in particular immediately after the connec tion;

Figure 3 process steps of the method according to the invention, wherein input to the terminal according to the request of the switching center, an identification code. and

Fig. 4 steps of the method according to the invention, a new terminal and / or user-specific identification information is agreed with the switching center on the initiative of the terminal. and

Fig. 5 shows the structure of an arrangement consisting of switching center and terminal for performing the inventive method.

In FIG. 2, process steps are a deverbindung produced at a telephone excha subscriber terminal CPE involved schematically shown of the method according to Invention in association with points in time after detection of a busy condition. The blocks with hatching denote transmissions from the terminal CPE to a switching center LE (public switching office; private branch exchange), while blocks without hatching denote information transmissions in the reverse direction, i.e. from the switching center LE to the subscriber terminal CPE.

It is assumed that after detection of a busy state B of the telecommunications connection established Participated subscriber terminal CPE through the switch device LE at time t = 0 a user data transmission is prevented. After a period of Ta after recognizing the Occupied state and prevention of user data transmission a first signal DT1-RQS entered into the terminal CPE and transferred to the exchange LE. Entering the Signals DT1-RQS is done manually by an operator, however, the terminal preferably sends the DT1-RQS signal automatically. This first signal directs a handshake Procedure between the terminal and the switching device.

After a time Tb after transmission of the first signal DT1-RQS, the exchange can send a confirmation signal Transfer FSK-ACK to the end device. Immediately afterwards thereon or after a time Tc after transmission of the before the signal FSK-ACK transmits the switching equipment device another signal FSK-RQS (request signal) with which the terminal or the respective operator prompts is, the terminal and / or an operator be Drawing information DT1-PIN (assigned by the network operator First code).

After receiving this information DT1-PIN, the switching device compares this information with first terminal and / or operator-specific reference information RE1-PIN stored there (memory MEML, FIG. 5) for a match in a time period Te after receipt of the signal DT1-PIN. If this check reveals a match between the two pieces of information, the switching device transmits a signal FSK-ACK denoting the match to the terminal, at the end of the time period Te. This signal FSK-ACK can be displayed on a display device assigned to the end device.

Following the transmission of this signal FSK-ACK, ie after a period Tf after transmission of the signal FSK-ACK, the switching device enables the transmission of useful data between switching device and terminal (release F). Only at this point in time can the call number of the B subscriber (CPE2, FIG. 5) be entered into the terminal CPE.

In the connection between the aforementioned ("first") end device and the switching device, another end device CPE 2 ( FIG. 5) can be involved, in the time between the detection of the busy state of the first terminal and the release of the transmission of user data no useful data (e.g. voice data) are transmitted between the first terminal and the switching device between the first and the second terminal.

The above periods Ta - Tf are used by the Netzbe driver specified, the by an interruption of the Loss of quality occurring with user data transmission is taken into account.

After establishing the telecommunication connection between the switching device and the terminal or after recognizing the busy state of the terminal by the switching device, a first information DT1-PIN identifying the terminal CPE and / or an operator can be entered into the terminal CPE and transmitted to the switching device LE becomes. The switching device LE compares the transmitted first information DT1-PIN with a first terminal and / or operator-specific reference information RE1-PIN, which is stored in a memory MEML ( FIG. 5) of the switching device, for agreement. If the two above-mentioned information DT1-PIN and RE1-PIN match, the switching device releases the transmission of user data between the terminal CPE and switching device LE within the framework of the connection established.

It can be provided that the first device and / or information identifying an operator DT1-PIN Receive one from the switching device LE to the terminal transmitted request signal FSK-RQS in the terminal CPE can be entered. In this regard, may continue be provided that the switching device LE the Request signal FSK-RQS in response to that from the terminal transmitted first signal DT1-RQS forms.

In Fig. 3 method steps of the United method according to the invention are shown after useful data have already been transmitted in the context of the established Ver connection. Alternatively, it can also be provided that the process steps shown in FIG. 3 are carried out immediately after the detection of the occupancy status B.

The switching device transmits a request signal FSK-RQS to the terminal. With this request signal, the terminal or the operator concerned is requested to enter further first information DTW-PIN (new secret number) identifying the terminal and / or an operator into the terminal. This information DTW-PIN is transmitted to the switching center LE, which in turn compares the transmitted further first information DTW-PIN with a further first terminal and / or operator-specific reference information REW-PIN. The reference information REW-PIN is stored in the memory MEML ( FIG. 5) of the switching device LE. The switching device LE only enables the further transmission of user data between the subscriber terminal and the switching device in the context of the connection established if the two information DTW-PIN and REW-PIN match. Furthermore, if the two pieces of information DTW-PIN and REW-PIN match, the switching device can transmit information FSK-ACK that designates this match to the terminal, wherein this signal can be displayed on the terminal.

The other first the terminal and / or an operator significant information DTW-PIN can be identical to the first the device and / or an operator designating In formation be DT1-PIN.

As already stated, are already in the switching device in addition to the information DT1-PIN and RE1-PIN also the others Information DTW-PIN and REW-PIN saved. Farther is specified in the switching device, to which Points in time which information DT1-PIN or DTW-PIN one hand and RE1-PIN and REW-PIN are valid.

The switching device LE can the request signal FSK-RQS more than once during a telecommunication connection in regular or preferably in irregular time Transfer distances to the end device CPE. The Switching device, for example, a quasi-random generator, which can be implemented programmatically in order to irregular time intervals between the transmission each to determine a request signal FSK-RQS.

When the transmission of a prompt signal to each egg ner time takes place in which the transmission of user data ge is blocked, between the transfer of two to each other following request signals FSK-RQS a time min The minimum distance is maintained to determine the quality of the user data not affect the wear.

The algorithm of the handshake procedure described (CPE-LE) can be known to the terminal. But it can also be provided be that the information DT1-PIN and DTW-PIN is not itself  actively transmitted from the terminal to the switching device but that this information is manually entered into the end device CPE can be entered.

Fig. 4 shows a further embodiment of the method according to the invention, with the proviso that after the detection of the busy state B of the terminal by the switching device, the method steps according to FIG. 2 are processed. However, the method according to the invention is not limited to this; rather, the method steps further specified in FIG. 4 can be carried out independently of whether the steps according to FIG. 2 have been carried out beforehand.

In this embodiment of the method according to the invention agreed the terminal or an operator of the terminal its own PIN, d. H. another first the endge advises and / or information identifying an operator DTW- PIN or DTWt1 PIN.

In this context, it is provided that a Signal DT-RQS entered and sent to the exchange is transmitted. This signal can be identical to the signal DT1-RQS. Triggered by the received signal if the switching device sends a request signal FSK RQS to the terminal, which then has a new secret number, d. H. a (further) first information DTW2-PIN, which the end device and / or an operator referred to the Ver averaging device transmits. Access to this information tion can by a signal FSK-V (Verify) by the mediator be confirmed, this signal on a display device assigned to the terminal can be displayed can be so that the operator can visually perceive that the transmission of the new first information DTW2-PIN was consequent. This procedure can be done with a DT-Quit signal be ended, entered into the terminal and sent to the Switching device is transmitted.  

It can be provided that information DTWt1-PIN designating a terminal and / or an operator, which is entered into the terminal at a specific first time t1 and then transmitted to the switching device, there (in the memory MEML, FIG. 5) REWt1-PIN is stored in the switching device as a piece of terminal and operator-specific reference information and is used for different tests. Any previously stored terminal and / or operator-specific reference information that may have been stored is overwritten by the current reference information.

Among other things, this reference information REWt1-PIN for a Checking the switching center for compliance with another first, the terminal and or an operator significant information used DTWt2-PIN entered into the terminal at a second time t2 and are transmitted to the switching device. At About agreement of these two information DTWt2-PIN and REWt1- PIN gives the switching device the transmission of User data between the subscriber terminal and the exchange direction in the context of a connection established. At this embodiment of the method according to the invention the information DTWt1-PIN identical to the information DTWt2 PIN.

Within the scope of the method according to the invention it can further be provided that the switching device blocks the transmission of user data after transmission of a request signal FSK-RQS (see FIGS . 2, 3 and 4) to the terminal, provided that following the reception of the request signal on Terminal no information designating the terminal and / or an operator is entered into the terminal. Furthermore, it can be provided that the information denoting the terminal device and / or an operator DT1-PIN, DTW-PIN, DTWt1-PIN, DTWt2-Pin can be entered into the terminal during the transmission of user data between the switching device and terminal and / or the switching device are transmitted.

In one embodiment of the method according to the invention, the switching device LE blocks the transmission of user data at least from the time of reception of the first signal DT1-RQS (beginning of the period Tb in FIG. 2) at least until the end of the test for compliance of the transmitted terminal and / or operator-specific information with the corresponding reference information.

According to a further embodiment of the method according to the invention, the switching device blocks the transmission of user data at least from the point in time at which the request signal FSK-RQS ( FIG. 3) is transmitted to the terminal.

Furthermore, the method according to the invention can be designed in such a way that a second signal DT2-RQS can be input into the terminal. This signal DT2-RQS is transmitted to the switching device LE, which, triggered by the reception of the signal, prevents the transmission of a request signal FSK-RQS to this terminal for a specifiable period of time. This second signal DT2 is RQS al lerdings be activated only after performing the steps shown in Fig. 2 so that out in this example in each case in the shown in FIG. 2 process steps.

Fig. 5 shows schematically an embodiment of an arrangement for performing the method according to the invention consisting of the switching center LE and the terminal CPE. A plurality of terminals can be connected to the switching device. A terminal CPE2 can be involved in the telecommunication connection between the switching device and the first terminal CPE described above.

The switching device, for example a HICOM private branch exchange from SIEMENS AG, has a control device CPU, with this being assigned a control program that defines the method. The memory MEML shown schematically in FIG. 5 serves, among other things, to hold the reference information Re1-PIN and REW-PIN.

The terminal is with a control device (microprocessor) MP equipped. The one assigned to the control device Control program works with the control program of the intermediary processing facility and defines the procedures that from the terminal in cooperation with the exchange direction.

Claims (15)

1. A method for establishing telecommunication connections, in particular telephone connections, between a switching device (LE) and a subscriber terminal (CPE), whereby after detection of a busy state of the subscriber terminal (CPE) involved in the established telecommunication connection, further information can be transmitted in addition to useful information, characterized,
that after establishing the telecommunication connection in the terminal (CPE), a first piece of information (DT1-PIN) identifying the terminal (CPE) and / or an operator can be entered, which is transmitted to the switching device (LE), that the switching device (LE) compares the transmitted first information (DT1-PIN) with a first terminal and / or operator-specific reference information (RE1-PIN) for agreement, and
that the switching device (LE) if the first information (DT1-PIN) matches the first reference information (RE1-PIN) releases the transmission of user data between the subscriber terminal (CPE) and the switching device (LE) as part of the connection established. 2. The method according to claim 1, characterized in that after a transfer of user data within the framework of the established connection further first the terminal and / or information identifying an operator (DTW-PIN) during the connection to the terminal (CPE) can be entered that the switching device (LE) the further transmitted first information (DTW- PIN) with further first terminal and / or operating person Individual reference information (REW-PIN) matches compares mood, and that the switching device (LE) only if the other first pieces of information match tion (DTW-PIN) with the further first reference information  tion (REW-PIN) a further transmission of user data between the subscriber terminal (CPE) and the operator direction (LE) in the context of the connection established releases. 3. The method according to the preamble of claim 1, characterized characterized in that at a first time (t1) rend the established connection a first, the Endge advises and / or information identifying an operator (DTWt1-PIN) in the terminal (CPE) for a first Time (t1) can be entered that the mediation direction (LE) this information (DTWt1-PIN) as one Terminal and / or operator-specific reference stores information (REWt1-PIN). 4. The method according to claim 2, characterized in that the switch (LE) at the first time point (t1) first information entered into the terminal (CPE) mation (DTWt1-PIN) to match one to two th time (t2) entered into the terminal first the terminal and / or an operator drawing information (DTWt2-PIN) compares, and that the switching device (LE) only if they match the second time (t2) in the terminal entered further first information (DTWt2-PIN) with the further first reference information (REWt1-PIN) further transmission of user data between participants terminal (CPE) and switching center (LE) in Releases frame of the connection established. 5. The method according to any one of the preceding claims, characterized characterized in that the first or further first the Terminal and / or an information characterizing an operator mations (DT1-PIN, DTW-PIN) after receiving one of the Switching device (LE) transmitted to the terminal Request signal (FSK-RQS) in the terminal (CPE) can be entered.   6. The method according to claim 5, characterized in that the switching device (LE) the request signal (FSK-RQS) in response to a transmission from the terminal forms the first signal (DT1-RQS). 7. The method according to claim 5 or 6, characterized in that that the switching device (LE) after transmission of the Request signal (FSK-RQS) to the terminal (CPE) die Transmission of user data blocks, if following none of the reception of the request signal at the terminal first or no further first the terminal and / or one Operator identifying information (DT1-PIN, DTW-PIN) is entered into the terminal (CPE). 8. The method according to any one of the preceding claims, characterized characterized in that the switching device (LE) at Matching of the first information (DT1-PIN) with the first reference information on the match transmits significant signal (FSK-V) to the terminal, which signal can be displayed on the terminal. 9. The method according to any one of claims 2 to 8, characterized characterized in that the further first information (DTW- PIN) during the transfer of user data into the Terminal can be entered and / or to the operator facility (LE) can be transferred. 10. The method according to any one of claims 3 to 9, characterized ge indicates that the switching device (LE) the Request signal (FSK-RQS) several times during a Telecommunication connection in regular or irregular transmitted to the end device (CPE) at regular intervals. 11. The method according to any one of claims 6 to 10, characterized ge indicates that during the transmission of the request tion signal (FSK-RQS) the transmission of user data ge is locked.   12. The method according to any one of claims 5 to 11, characterized ge indicates that the switching device (LE) the Transfer of user data from the time of receipt of the first signal (DT1-RQS) at least until completion locks the check for compliance. 13. The method according to claim 5, characterized in that in the terminal can input a second signal (DT2-RQS), which is transmitted to the switching center (LE), and that the switching device (LE), triggered by the second signal received, the transmission of the Request signal (FSK-RQS) to this terminal for prevents a predeterminable period of time. 14. Switching device (LE) with a control device (CPU) to carry out the method according to one of the preceding claims in cooperation with an end device (CPE), characterized in that one of the Control device (CPU) assigned it control program defines the procedure. 15. Terminal (CPE) with a control device (MP) for Implementation of the method according to one of the claims (1- 13) in cooperation with the switching center (LE), characterized in that one of the tax direction (MP) assigned it to the control program Procedure defined.