DE2647476A1 - Telephone exchange reversed charges system - uses extra code dialled before called number which transfers charge pulses, with agreement of called party - Google Patents

Abstract

The system has the facility for charge transfer to the called subscriber, which is normally the responsibility of the calling subscriber. When the called subscriber accepts the charge transfer, he operates a device allocated to his line, which sends to a signal to a switch in the change bu which transmission of charge pulses to the calling subscriber is stopped and transferred to the called subscriber. The calling subscriber who wishes to make a call charged to the called subscriber dials a special code before dialling the called subscriber number. A device behind the counting pulse generator is looped in. It signals to the called subscriber to wish for charge transfer. Signal transmitted now by the called subscriber to the special device confirms the acceptance of the call, and the charge pulses are now sent to a store located to the called subscriber.

Description

Telephone switching system with takeover of the call

fee by the called subscriber The registration concerns a tele-speaking exchange system with the option of assuming the call charge through the called subscriber for whom the fee is usually paid by the calling subscriber is borne and with whom the called subscriber, QEls he to the call fee wish to take over, by actuating one of his telephone connection assigned Establishing a takeover identifier in the switching system specifically for this purpose provided switching means through which the transmission of counting pulses for interrupted the calling subscriber and instead charged the called subscriber will.

Such a system is already from the DT-PS 10 95 325 for Transfer of local traffic charges known.

However, it is not possible to assume fees for long-distance transport. Especially in long-distance traffic, however, there is an interest that in special cases the fees be taken over by the called party, as they are a multiple of the fee in local traffic be.

The invention is based on the object of a device of the above Art to create with which the charges in long-distance traffic are taken over by the called party can be.

This is achieved according to the invention in that the calling subscriber, who wants to conduct a call for which the called subscriber pays the charges, by dialing a special code before dialing the number of the person called Subscriber causes the establishment of a connection path to the called subscriber, in a special device behind the counting pulse generator, as seen by the calling subscriber is looped in, which the called subscriber after his report is present of the desire to take over the call charges signals that a follow-up from called subscriber sent takeover identifier to the special facility Sending a confirmation to the called subscriber and initiating the transmission caused by charge pulses to a memory assigned to the called subscriber and that the usual transmission of charge pulses to the calling subscriber is prevented will.

This has the advantage that the interventions in the existing Switching system are very low and that the calling party learns that the called subscriber pays for the call according to his wishes takes over.

A further development is that the special device a Contains memory in which the call number of the subscriber authorized to transfer charges are stored that when the connection is set up, those selected by the calling subscriber Digits are compared with the contents of the memory and that if there is no match the connection is released. This has the advantage that the occupancy time of the special facilities for connections to unauthorized participants to a is limited to a very short time.

Other developments of the invention can be found in the subclaims.

The invention will now be explained with reference to the accompanying drawings illustrated embodiments explained in more detail. They show: FIG. 1 an overview plan of a switching system according to an embodiment of the invention, FIG. 2 is a block diagram the special device used in FIG. 1, FIG. 3 an overview plan of a switching system according to a second embodiment of the system, FIG. 4 shows an overview diagram of a switching system according to a third embodiment and FIG. 5 a block diagram of the new additional devices in Fig. 4.

If the calling subscriber A-subscriber wants the subscriber to be called by him Subscriber B-Tln takes over the call charges and is entitled to dial between the traffic elimination number 0 and the area code for the local area network of the B subscriber a special code number 12.

The further choice is then made in the usual way. This particular one Code number 12 controls the access to the line charac- teristic transfer of charges.

With the first selected digit 0, the I. group selection .1. GW set to the O-alley and occupies a counting pulse generator in a known manner ZIG in the node exchange, which is then via the relay search selector RSW a free node register KRG is occupied. This register takes the chosen particular Code number 12 and, if applicable. still part of the area code and then forwards a Request to the corrector UMW. From the digits 12, the corrector recognizes that a Connection to a special facility SE is to be switched and gives a corresponding Information. The node office direction selector KRW is set to a direction to which the special facilities SE are connected and occupies one of them.

At the same time, the ZIG counting pulse generator receives a code that identifies it switches to the international traffic "state. The counting pulse generator then does not work more as a pulse generator but as a pulse repeater for a downstream Pulse generator (usually foreign counter pulse generator) emitted pulses and has the Time monitoring switched off.

The node exchange register takes all further digits sent by the A-subscriber KRG and forwards them to the special facility SE. The occupied special facility SE then occupies a free node exchange register via the relay search selector RSW KRG ', which takes over the area code from the special facility SE and then this passes on to a corrector UMW.

The corrector then recognizes the origin and sets the zoning for the fees and has one of the special facilities set up occupied node office direction selector KRW 'in the desired direction, with either the code path KZW or cross-connection lines QL can be used. That Node register KRG 'then stores all of the connection establishment in a known manner required digits. When the B-subscriber is reached, the will be sent back End-of-election sign recorded by the special facility SE. How the special facility works is described in more detail below with reference to FIG.

When the B-subscriber answers, there is a start signal in a known manner sent back. The special facility picks up this symbol and controls depending on the situation of which the transmission of a counting pulse to the A subscriber, that of the counting pulse generator ZIG is passed on because it is set to "Abroad", and transmits briefly an advisory tone to the B-subscriber so that he knows that it is a conversation acts for which he is supposed to pay the fees. If he'll take the charge wants, he sends a transfer indicator back to the special facility, which then briefly transmits an audible tone to the A-subscriber so that he knows that the B-participant has taken over the fee. At the same time is then in the special facility with the generation of charge pulses in accordance with those specified by the corrector Zone started, which are stored in the special facility and after the end of the call together with the call number of the B subscriber, which was passed through when the connection was established Digits is known, forwarded to a central unit ZE. This in the central unit The recorded information can then be used to charge the B-subscriber will.

The transfer indicator can, for example, result from the sequence of the number disc (Digit 0) are generated at the B-subscriber, from which then in the line selector LW 1-3 short characters (interrupted flicker final character) can be corrected, which in the transmissions are corrected to the length of short backward characters. These characters are recognized and counted in the special facility. If <3 characters arrive, in this way, a takeover indicator is recognized, while if> 4 characters are received is recognized on the flicker termination sign. The connection will be at the end of the flicker signal triggered forwards and assigned a busy signal to the A-subscriber.

If the B-subscriber is not willing to pay the fees and accordingly does not send a takeover indicator, a time monitoring device disconnects the connection in the special facility. To make sure connections over the special facility can only be set up for authorized participants Call number with area code of the authorized participants in the special facility and the number dialed by the A-subscriber is saved in the special facility compared with these stored numbers. If not a match with one of the stored numbers exists, the connection is made by the special facility triggered.

Essential components of the special equipment SE (Fig.2) are a Counting pulse generator ZIG ', which differs from a normal Counting pulse generator only differentiated by the wiring, a fee recording unit GE and a Device ZA for character evaluation for the backward characters.

The dialing pulses sent by the A. subscriber hit the d-wire in the special facility SE and become a call number memory RSp in the Charge recording unit GE directed, stored there and with the help of the comparator Compare with the call numbers of the authorized subscribers stored in the control memory KSp compared.

If there is no match, the comparator causes the Counting pulse generator ZIG 'to release the connection.

At the same time, the dialing pulses are transmitted via the ZIG 'counting pulse generator forwarded to a node register KRG ', which in connection with a corrector then, as already explained above, the establishment of the connection via the node exchange direction selector KRW 'controls and sets the charge zone in the ZIG' counting pulse generator.

All incoming backward characters are picked up by relay E. and passed on to the character evaluation ZA via contact e. The first incoming Sign can either be lane or election end and becomes the counter ZIGt forwarded directly to this; Evaluates characters in a known way (when the lane is busy Triggering, at the end of dialing shutdown of the node register).

The second incoming character can either be the beginning character or the subscriber busy be. If the participant is busy, the ZA character evaluation will trigger again, while at the beginning of the character with the contact assigned to the character evaluation zall an audible tone generator HTG applied to the speech lines leading to the B-subscriber for a specified time and transmit a sign to it.

At the same time, the message counting pulse is sent to the A subscriber via contact za12 sent.

Furthermore, a time monitoring for e.g. 15 sec started. If the takeover indicator is not received when this time has elapsed triggers again.

A character string that is received during the runtime of the time watchdog it is then checked whether there are> 4 characters (flicker termination sign - triggering) or s are 3 characters (transfer indicator). when determining the takeover indicator an audible tone generator is sent to the voice line to the A-subscriber via contact za2 switched on to indicate that the fee has been taken over by the To transmit called. In the triggering cases, the transmission is via the contact zab controlled by a busy signal.

With the takeover indicator, the counting pulse generator ZIG ' a start character and begins the counting pulses corresponding to the set zone, derived from the clock generator ZTG, to be generated and delivered via its vein.

Deviating from the usual wiring of a clock the delivered counting pulses now to the charge memory GSp of the charge device GE and are totaled there.

At the end of the call, the special facility SE receives the flicker stop signal, which is evaluated by the character evaluation ZA and the release of the connection controls.

With this final trigger from the character evaluation ZA becomes also released a gate circuit T in the charging device GE and for this Call number stored in the conversation and the accumulated charge pulses are used for Transfer to central device ZE for further processing.

Depending on the components chosen, it can also be useful be to separate the fee facility GE from the special facility SE and with a corresponding increase in the storage space for call numbers and charge pulses to be used jointly for several special facilities.

However, it is also possible to first install the special device SE in the central switching centers ZVSt (Fig. 3) to be used.

The connection to the special facility is established via the code path in the usual way for normal telephone connections, i.e. from the node exchange direction selector KRW a connection record is sent via the code path ANS occupied in the main exchange HVSt and then with the help of a main office register HRG and a corrector assigned to it, the setting of the main office direction selector HRW and the central office group voters I.ZGW and II.ZGW on a free special facility SE controls. In this case, too, the counting pulse generator ZIG is in the central exchange KVST adjusted to international traffic.

From the special facility SE then another first Central office group selector I.ZGW reached as with normal connections of the B-subscriber.

The structure and operation of the special facility in the central office switching center ZVSt does not differ fundamentally from the structure and the way it works the special facility already described above in the node exchange. When using the special facility in the central office exchange, a Origin detection is no longer possible and therefore correct zoning is also possible do not take place, at most a subdivision into own and external central office exchanges. This means that only two time cycles then need to be connected.

When using the special facilities in the central office exchanges there is the advantage that relatively few special facilities are necessary. That stands but on the other hand the disadvantage that all traffic is always routed via the code path must be, even if the target is in a place that is usually about a cross line is reached. This means that there are more lines for the key figure path necessary. In contrast, when the special facilities are used in the Node exchanges require more specialized facilities, but it can all existing cross lines can also be used. So there are costs for special facilities compared to the cost of cables.

If a fine zoning for the fees is not deemed necessary the special facility can be divided be in a part in the node or central office switch and to a part in the destination local switch.

With such a system (FIG. 4), the A-Participant achieves after Choosing the special code instead of the special facility is a simpler one Special connection kit SANS, which only has that part of a counting pulse generator which is necessary for connection establishment and monitoring, as well as the facilities for character evaluation and audible tone transmission correspond to Fig. 2.

B-subscribers who are entitled to pay the call charge, have a special additional charge GZS, which is connected to the subscriber circuit TS is. Furthermore, all line selectors LW via which such subscribers can be reached are provided with an addition LZ, the structure of which is further detailed with reference to FIG is described.

The evaluation of the end-of-election and beginning characters is done in the special connection block SANS exactly as already described for the special arrangement SE with reference to FIG.

The B-subscriber receives after the report also with this execution an advisory tone and then sends a takeover indicator by means of the dial (Digit 0) back.

The addition of the line selector LZ picks up on this indicator and transmits it to the additional fee GZS, which evaluates it and if received correctly forms a long backward character that is transferred to the addition LZ and there as DC signal is applied to the speech vein a.

In the special connection set SANS, this character is used as a transfer indicator and at the same time evaluated as an authorization identifier. Simultaneously with that Sending the direct current signal is also initiated in the additional charge, the counting. Since the origin cannot be determined, a single counting cycle is sufficient.

If unauthorized B-subscribers also use the Let the number disc expire, this can probably be recognized in the special connection kit. The connection is triggered anyway because the long DC symbol appears the speech artery a is missing and cannot be imitated by the participant either.

When the number disc expires, the feed relay A (Fig. 5) drops in Clock of the pulses from and its contact a applies potential to the known line selector L provided point TB. This potential, which occurs in pulses, is added LZ in the series-connected amplifiers V1 and V2 on one opposite the Potential on test wire c positive potential amplified and applied to this c wire. As long as the amplifier Vi is working, it blocks the amplifier V3, which is responsible for this Time on the c-core should not increase potential.

This positive potential is again in the subscriber circuit of the c-core is tapped and passed into the GZS fee rate and controls via a Separation stage Tr an evaluation counter AZ. The rectifier G3 prevents the bistable flip-flop FP is operated.

As soon as the selection counter is 10, corresponding to the ten pulses for the digit 0, has reached the monostable multivibrator MF is triggered, which has a positive potential for a specified time of e.g. 750 ms upd applies the separation stage Tr at the same time via the rectifier G3 to the c-core locks. In addition to the line selector LZ, the amplifier V3 is enabled and amplified the incoming potential, so that relay S responds and with its contact s during this predetermined time a ground potential connects to the speech wire a. By the triggering of the monostable multivibrator MF also becomes the bistable multivibrator FF tilted, which applies a potential to input B of the charge clock GTG. Of the Charge clock is controlled by a control clock ST and forwards every nth Clock pulse from input ZT to output ZJ, which is then amplified in Amplifier V4 continues the charge meter z associated with the subscriber by one digit.

The one described in OS 24 11 223, for example, can be used as the charge clock Additional device ZE can be used. The connection points of the charge clock GTG have the same reference numerals as the additional device in the above OS received.

With the rectifiers G1 and G2 there are undesirable influences prevented.

With this separate arrangement of special connection rate and fees In addition, it is also possible to use the SANS special connection set in the central office exchange to be built in.

It is also possible to change the transfer indicator after the automatically generated by the called subscriber.

Claims (9)

Claims 49 telephone switching system with the possibility to take over the call charge by the called subscriber for whom the charge is usually borne by the calling subscriber and for which the called subscriber, if he wishes to pay the call charge, by pressing one of his Telephone connection associated device a takeover identifier to in the switching system specially provided switching means through which the transmission of counting pulses for the calling subscriber and instead the called subscriber is charged, characterized in that the calling subscriber (A-Tln), the one Wants to conduct a call for which the called subscriber (B-subscriber) pays the charges, by dialing a special code number (12) before dialing the number of the called party Causes the establishment of a connection path to the called subscriber, in the one behind the ZShlimpulsgeber (ZIG) as seen from the calling subscriber Special facility (SE) is looped in, which the called subscriber after his Notification of the request, signaled that the call charges will be accepted (HTG) that a transfer identifier sent by the called subscriber the special facility (SE) to send a confirmation (HTG ') to the calling party Initiates participants and the transmission of charge pulses to one of the rumored Subscriber allocated memory (GSp) causes and that the usual transmission of charge impulses to the calling subscriber is prevented. 2. System according to claim 1, characterized in that the special device a memory (KSp) contains, in which the call numbers of those authorized for transfer of charges Subscribers are stored that when the connection is established by the calling subscriber selected digits are compared with the contents of the memory (cf.) and that at Mismatch the connection is released. 3. System according to claim 2, characterized in that the calling party Subscriber's dialed number is stored in the special facility (SE) (RSp) and that the charge pulses for a connection in a charge memory (GSp) in the special facility and together with after the end of the conversation the stored phone number can be transmitted to a central facility (ZE). 4. System according to claim 1, characterized in that the special device (SE) Means for receiving (E) and evaluating (ZA) the backward characters and sending means (HTG, TG ') for reference symbols. 5. System according to claim 1, characterized in that the special device (SE) is divided into two parts, that one part (SANS) in a remote switching center near the originating exchange and the other part (GZS, LZ) in the Destination exchange is arranged that the one part (SANS) transmission means (HTG) Contains that the participants information about requests for payment of fees and Transfer completed transfer of fees, as well as receiving devices (E, ZA) for Recording and evaluation of the backward signs and that the other part (GZLZ) middle (MF, S) for generating special backward characters, as well as means for generating and Storage of fees. impulses (GTG, T) contains. 6. System according to claim 5, characterized in that the in the Destination exchange arranged part (GZS) each to an authorized subscriber is assigned and forms an addition to the subscriber circuit (TS). 7. System according to claim 6, characterized in that the called Participants via the voice lines sent backward characters in the line selector (LW) tapped and via the test wire (c) to the addition assigned to the subscriber (GZS) is transmitted, which forms a new character (MF) from it and over the same The wire is transmitted back to the line selector and that the reception of this character causes the transmission (S) controls a special information that cannot be imitated. 8. System according to claim 1, characterized in that the counting pulse generator (ZIG) depending on the selected code (12) in the status "international traffic" is controlled. 9. System according to claim 1, characterized in that the start character is routed as a message counting pulse to the calling party's counter (zal2).