DE717900C - Circuit arrangement for crediting charges in telecommunication systems, in particular telephone systems - Google Patents

Description

Circuit arrangement for billing fees in telecommunications systems, in particular telephone systems The present invention relates to a circuit arrangement for crediting fees in telecommunications systems, in particular telephone systems, in which, after the connection becomes subject to charges, for each of the Factors determining the amount of the fee be transmitted.

It aims to reduce the number of Registration elements simplify the registration device as much as possible and thereby achieve the switching operations required for registration. this is achieved by the fact that the individual factors (zone, tariff) for the fee determination characterizing current surges a setting of registration elements of the registration device in a position characteristic of these factors and the identification currents for other factors (time) multiple recording (one for each current impulse) the characters determined by the previous setting.

The figures show an embodiment of the subject matter of the invention shown. There are only for the sake of simplicity and clarity the peeling means and devices required to understand the invention shown.

If -ein - subscriber TN as shown in FIG. I lifts his receiver to initiate a connection, the preselector THW adjusts itself in a known manner to a free first group selector i GW. The occupancy relay C, not shown, and the isolating relay T, also not shown, respond in a known manner via the test wire with the switching arm c, which is only indicated here. The following circuit then arises: earth, relay B i in group selector i GW, switching arm b of preselector VW, contacts 53 t, 5izz, subscriber loop, contacts q.8zz; 52 t, switching arm ca of the preselector THW, winding of relay A in the group selector, battery, earth.

In this circuit, relays A and B of the group selector respond. When relay C responded, ground potential was applied to the upper speech wire at contact 55 c in preparation. The participant now sends out power surges to set the first group selector. If the first group selector has found a free, subsequent connection device shown in FIG. 2 in the set decade, the following test current is generated: earth, contacts not shown, windings II and I of relay P, switching arm c of group selector i GW, switching arms 2Y1'6 3, aM 3, ym 3, bzza 3, winding of the occupancy relay Ca of the transformer shown in FIG. 3, battery, earth. In this circuit, the relay P of the group selector i GTTl and the occupancy relay C2 of the transformer respond. The relay P locks the found free transformer on - contact 63 P against other occupancy and performs the other switching processes in detail here shown, from well known. If the subscriber now sends out the second series of current impulses, which in addition to the setting of the second group selector in the present example contains the indicator "for the value of the connection, the series of current impulses recorded by relay A in group selector i GW at contact 54a via the upper speech wire to Relay A 2 of the transmitter shown in Fig. 2 transmits: earth, contacts 55 c, 54a, switching arm a of the group selector i GW, winding of relay A2 (Fig. 2), contact ioi g, resistance Wi io, battery, earth When the contact 104a2 closes in a pulsed manner, the pulses received by the relay A2 are passed on to the second group selector. Earth, battery, winding of the magnet Zll.l, switching arm zzn2 in rest position, contact iii a2, winding of the relay T12, earth. The magnet ZU brings its switching arms zzn i, 1M2, Mit 3 to the first contact. The switching arm znt 3 is therefore switched from the rest position, so that the previously described circuit for the relay C2 is opened. However, this is of no significance for relay C2, since it has placed itself in a hold circuit by closing its contact 103C2. The relay T12 in the circuit just mentioned is a delay relay, so that it bridges the pauses during the series of pulses. The second and the other impulses of the series of impulses then reach the magnet ZM in the following way: earth, winding of relay T12, contacts iii a2, i 12 v2, switching arm zzn2 in working position, magnet Z117, battery, earth. The magnet ZIU therefore brings its switching arms, including the switching arm NZn i, which carries out the zone identification, to a specific contact. After the series of current impulses has been transmitted, there is a longer pause, so that relay b'2 drops out. It opens its contact i i2 v2, so that the subsequent series of current impulses sent by the calling subscriber can no longer influence the magnet ZU, but are only transmitted to the following connecting devices via the upper voice wire. If the connection to the desired subscriber has been established and the called subscriber has lifted his receiver, the following circuit is created: Earth in a subsequent connection device, lower speech wire, contact 1079 "winding of relay G2, battery, earth. Relay G: 2 closes his Contact 108g2 (drag contact) and thus the following holding circuit: earth, contacts 109c2, 1o8, -2, winding of relay G2, battery, earth. Furthermore, it closes its contact 115 9, and thereby switches a periodically closing clock contact ii4uh to Magnet Y11.1, which is used to switch the switching mechanism that determines the duration of the connection, so the magnet Ylhl receives a certain number of pulses during the duration of the connection and switches its switching arms ytyti, yln2, ynt3 step by step.

If, after the connection is terminated at the calling station, the final signal is given by hanging up the receiver, the relay C in the first group selector drops in a known manner. The contact 59 c (Fig. I) is closed, creating the following circuit: earth, battery, windings 1I and I of relay Y, contacts 59 c, 58w (shaft contact that is closed when the group selector is turned for the first time). Resistor Wi4, winding of relay AJY, contact 71d, earth. Due to the high resistance of relay AN, only this relay, but not relay Y, can respond in this circuit. The relay AN closes its contact 78 old and thus the following circuit: earth, battery, winding of the magnet D of the selector WR, contact 76P1, switching arm, whether in the rest position, contacts 78 ate, 96x, earth. The magnet D switches its switching arms da and db one step forward. By opening the contact 71d, the above-mentioned circuit for the relay AN is interrupted and this thus causes it to drop out. It opens its contact 78 and thus the mentioned circuit for the magnet D. The result is that the contact 71 d and thus the circuit for the relay AN is closed again. The rotary magnet then receives the second current impulse by closing the contact 78an and switches its switching arms further. With the switching arms sits on the same shaft a disk designed in the manner of a template, which has bores in various numbers and combinations on its circumference. The calling subscribers are identified in the registration device RE by the various combinations of holes. The game between the magnet and the relay AN is repeated until the switching arm da has reached the contact via which the switching arm e of the preselector VW is connected. The following circuit is then established: earth, windings II and I of relay P i, winding of relay Z, switching arm da of selector WR, switching arm of preselector VW, contacts 58 w, 59c, windings I and II of relay Y, battery , Earth. In this circuit, only relays Y and P i can respond, but not relay Z. The relay P i closes its contact 7o p1 and blocks the found, calling subscriber against ielocation on the part of another, not shown selector bT 'c. It also stops the selector WR by opening the contact 76p1. The perforated disk is thus set in a position that characterizes the calling subscriber. The relay I 'in the first group selector i GW closes its contacts 56y, 57y and 62y. At contact 57y ground potential is applied to the lower speech wire via relay ZR and battery potential is applied to the upper speech wire via winding III of relay P via contact 56y. The result is the following circuit: earth, battery, winding III of relay P in the first group selector i GW, winding of relay A2 in the transformer (Fig. 2), contact io2g, earth. In this circuit, the relay P of the first group selector i GW is kept energized and the relay A 2 of the transformer is switched on. A drop in the relay P in the first group selector , GW is thereby initially prevented despite short-circuiting its winding I at contact 62 y. By closing the contact 121 a2 in the transformer (Fig. 2), the following circuit is created for the pickup magnet Albf: earth, contacts i22 g2, I2i a2, I20 z2, 11811 "winding of the magnet A111, battery, earth. The magnet AM switches one step forward his switching arms amn i, am 2, ain 3. At the same time, the following circuit is closed by contact 125 am of magnet A J1: earth, winding of relay T13, contact I25 am, winding I of relay Z2, battery, earth. The relay Z2 opens its contact, 05 z2, via which a choke coil DR and ground potential is connected to the lower voice wire, and closes its contact, o6--2, thereby connecting battery potential to the lower voice wire via resistor Wi ii. D, as relay Z2 continues to open its contact i2oz2 and thereby the above- mentioned circuit for the pick-up magnet AM. The above-mentioned circuit for relay Z2 is opened at contact 25 am . Relay U 3, which is in the same circuit, is marked with v equipped with delayed dropout , so that it cannot drop out due to the short interruptions at contact I25 a3-ia during the series of current impulses. The contact i2oz2 is then closed again, so that the circuit for the pick-up magnet AM is restored. By closing the contact i25 on the new circuit for the relay Z2 is created, which sends the second impulse by closing its contact io6r2 via the lower speech artery. The play between the magnet A1ff and the relay Z2 and thus the transmission of the current impulses via .die b-wire continues until the switching arm on i has reached the contact to which ground potential is switched on via the switching arm zzya i set. Then the following circuit is established: earth, switching arm zzn i in a certain position, winding of relay U2, battery, earth. The relay U2, which responds in this circuit, opens the contact ii 8 zz, and thereby switches off the pick-up magnet AM . To do this, it switches on the pick-up magnet Bild in preparation by closing the contact i i9 u2. By prolonged opening of the contact 125 on the delay relay T13 is brought to drop, so that the following circuit for the pick-up magnet Blbl now comes about: earth, Kontaktei22g2, i2ia2,, 20z2, II9I't2, i23vs, winding of the pick-up magnet image, battery, earth. The pick-up magnet BM switches its switching arms bmi1, bin2 and bm3 to the first contact. At the same time it closes its contact i26bm and thus the following circuit for the winding of relay Z2: earth, contact i26 bm, winding I of relay Z2, battery, earth. The transmission of a second series of current impulses now begins via the lower voice wire by closing and opening the contact io6z2 several times. By opening the contact i2oz, the mentioned circuit for the pick-up magnet BM is opened, and a similar play now sets in between the pick-up magnet BIVI and the relay Z2. This game continues until the switching arm bm i has found the contact to which ground potential is applied via the set switching arm ym i. The following circuit is then established for relay Z2 via its winding II: earth, switching arm ym i in a certain position, switching arm bm i in a corresponding position, winding II of relay Z2, battery, earth. The relay Z2 is kept constantly energized in this circuit, so that by continuously opening the contact I2oz .. it is not possible to switch on the pickup magnet BIIf again. By closing the contact io6z2 for a longer period and thereby connecting the battery potential to the lower speech artery for a longer period of time, the relay ZR in the first group selector i GIY is energized for a longer period of time. The relay ZR closes its contact 61 z1- for a long time, so that the short-circuit thus produced for the winding III of the relay P becomes effective and causes this relay to drop out. As a result, the contact 63 p is opened and ground potential is thereby taken from the y blocking wire. In the transformer (Fig. 2) this ground disconnection causes the relay C2 to drop out, which also opens its holding circuit at contact 103 c2. By opening the contact iioc. the signal to trigger the following connection device is given. Furthermore, the failure of the relay C2 is also the sign for the general tripping of the devices provided in the transformer. The zone identification magnet ZM is switched to the rest position in the following way: earth, battery, magnet ZiVI, switching arm zzn2 in working position, contact 113c2, relay interrupter RU, earth. The magnet Zit, 1 advances its switching arms step by step until they reach the rest position in which the relay interrupter RU no longer has any influence on: the magnet ZM. The magnet YM, which is used to identify the duration of the connection, is influenced in the following ways: earth, magnet Ylll, switching arm ym2 in working position, contact ii6co, relay interrupter RU, earth. When the switching arms of this magnet reach the rest position, the relay interrupter RU no longer has any influence on magnet YJ1 either. In the same way, the ANI and Biel pick-up magnets are moved into the rest position with their switching arms. The home circuit of the pick-up magnet A1,7 is as follows: earth, relay interrupter RU, contact f17 c2, switching arm am2 in working position, pick-up magnet Aibl, battery, earth and that of the tap switchgear BM: earth, relay interrupter RU, contact 1:24 c-., Switching arm bin-- in working position, pick-up magnet B3l, battery, earth. Opening the contact 1o9 c2 also causes the relay G ?, to drop out.

Returning to the arrangement according to FIG. I, it should be emphasized that two rows of current impulses pass one after the other from the transformer to the first group selector i GW, of which the first contains the identification of the zone, the second the identification of the duration of the connection. The relay ZR in the first group selector i GW therefore receives two series of current impulses one after the other. By correspondingly closing its contact 6o -, r and generating a stronger current via the switching arm e of the preselector VTY, the relay Z in the registration device is made to respond in a corresponding manner. With your first impulse of the first series of impulses, contact 72 z and thus the following circuit for relay V are closed: earth, contacts 72, 5, 73 w, winding of relay b ', battery. Earth. Relay V closes a hold circuit at contact 74z and prepares a circuit at contact 79 v for relay ZT7. This comes about in the first pause, ie when relay Z drops out for the first time: earth, contact 79v, 80z, winding of relay W, battery, earth. By closing its contact 82 ui, the relay W makes itself independent of the contact 79v. When relay V responded, contact 84v and thus the following circuit were also closed: earth, contacts 84v, 85 w, magnet AM, battery, earth. This circuit is opened after the relay W has responded. The magnet AM is therefore only actuated once for each connection. He has a punch pen with which he makes a one-off registration for each connection. It thus registers the number of connections (more details later in the description of FIG. 3).

If the second impulse now reaches relay Z, the following circuit occurs for magnet ZO - earth, contacts 66 w, 67v, 68z, magnet Z0, battery, earth. The magnet ZO moves, as will be explained in more detail later with reference to FIG. 3, a perforated disk for the zone identification. At the same time he adjusts his switching arms zoa, --ob, zoc, zod and zoe, which sit on the same shaft as the perforated disk, and the zone magnet takes one fewer steps than the first pulse series contains pulses. If only a single current impulse is transmitted in a known manner with local connections, the magnet ZO remains unaffected. In this case, there is no adjustment of the perforated disk for the zone identification. There now follows the pause between the first series of current impulses, which are used for zone identification, and the second series of current impulses, which characterize the duration of the connection. The longer opening of the contact 72z during this pause causes the delay relay V to drop out. The W relay, however, remains in the working position after the V relay drops out. The pause between the series of pulses is dimensioned so that the relay R ' continues to keep its contacts attracted. If the series of current impulses used to characterize the duration of the connection comes in, the relay ZR is influenced in the same way as with the first series of impulses. Its current impulses are generated by the pulsed closing of the contact 6ozr on the relay Z. The random pulses are transmitted to the punch magnet ST at the contact 88 z: earth, contact 88z, switching arm zoc, contact 86v, punch magnet ST, battery; Earth. The punch magnet now pushes in the zone identifier and the identifier for the calling subscriber so often. Paper tape, like the second series of impulses, contains impulses. After each punching, the paper tape is transported further in a known manner. Everything in more detail is described later with reference to FIG. 3.

After the second series of pulses, relay ZR is energized for a longer period of time held, as a result, the relay P is short-circuited its winding for a long time III brought to waste at contact 61 zr. This is the sign for what is now taking place Release of the connection devices and release of the registration device. These Processes are insignificant for the subject matter of the invention and therefore do not need to be to be explained in more detail.

If the requirement is to be met to show the subscriber with this counting method on a meter at the station the fee to be collected for the connection established, the following options are possible: It would have to be provided in a fee display at the station that works in such a way that it works on two different counters that record the identifier for the zone and that for the time. Then it would suffice to arrange a winding of the relay ZZ between the switching arm e of the preselector and the switching arm da of the selector WR. The two series of current impulses would then be transmitted one after the other to the charge indicator GA at the station TN by closing the contacts q9 zz and 5o zz accordingly. A reversing relay operating with a delayed dropout would then have to switch from the first to the second counter after the first series of impulses. The charge for the connection can then be derived directly or from a table from the information appearing on the charge indicator. The identification of the amount of the fee on a fee indicator constructed in this way is very simple. Difficulties only arise when the fee is to be identified on an ordinary meter at the station, ie a meter that only contains a meter. Eliminating these difficulties is the purpose of the additional device of the converter UR shown in the bottom third of FIG.

If the indicator for the zone is given by the first series of impulses, the switching arm zod is brought to a specific contact according to the number of pulses transmitted. As soon as the switching arm zoa of the magnet ZO has left the normally closed contact, the following circuit is created: earth, battery, winding of relay ZZ, switching arms db, switching arm zoa, contacts gox, g2db, winding I of relay G, earth. The relay ZZ responds and closes its contacts q.gzz and 5ozz. As a result, an alternating current source is switched on simultaneously over both speech wires, which influences the charge indicator GA at the calling subscriber station. This gives the GA charge indicator its first impulse. The relay G; responsive also in the above-mentioned electric circuit closes its contact 98g and thereby following circuit for the Abgreifermagneten DB: g soil, contacts 98, magnetic DB, battery, earth. The pick-up magnet DB switches its switching arms i db, 2db, 3db and q.db one step forward. The circuit for relays ZZ and G is disconnected by opening contact 92 db. The magnet DB is therefore 98g energized by opening the contact and closes the contact g2 db turn the circuit listed above for the relay ZZ and G. The charge indicator is given a new impetus, and at the same time by closing the contact 98g of the circuit for the Abgreifermagneten DB restored and made an indexing of his switching arms. The game between the magnet DB and the relay G continues. It should be noted that the tap DB thus begins its run already during the transmission of the first series of impulses, regardless of whether the switching arm zod, which identifies the zones, and the switching mechanism DZ, which characterizes the duration of the connection, with the switching arms i dz to 7 dz are already set is. The magnet DZ is advanced by the current impulses of the second series of current impulses, which act on the stamping magnet ST, namely in the following circuit: earth, contact 8gst, switching arm q.db in working position, winding of the magnet DZ, battery, earth. In order to prevent the gripper DB with its switching arm 3 db overtaking the zone switch and the timer, the arrangement is such that when this switch is caught, the relay G is excited via its winding II: earth, contact 75 w, switching arm zod in a certain position, one of the switching arms i dz to 5 dz, switching arm 3 db, winding II. of relay G, battery, earth. The relay G thus keeps the magnet DB excited and prevents the tap from being switched on until the earth potential is switched off by switching one of the contact arms i dz to 5 dz or the switching arm zod. If the switching arm 3 db now comes to the contact, which is characterized by the contact arm zod of the zone switch and one of the contact arms i dz to 5 dz of the timer, the pick-up stops because the relay G via its winding II in the already mentioned Circuit is kept energized. After the last pulse of the second series of impulses has been transmitted, the contact Si z is open for a longer period of time. The relay W will therefore drop out for a short time, so that the contact 75 w is opened. At this moment the short-circuit for winding II of relay X is canceled, so that it is excited in the following circuit: earth, winding II of relay X, contact gq.x, switching arm zod, one of the switching arms i dz to 5 dz, switch arm 3 db, winding II of relay G, battery, earth. The relay X places itself in a hold circuit by closing its contact 93 x via its winding I and prevents further influencing of the relay ZZ and thus the charge indicator GA at the calling station by opening the contact gox.

It can thus be seen that the two separate via the lower speech artery transmitted pulse series converted into a current impulse series by the additional device so that this arrangement is also useful for displaying the amount of the fee an ordinary training fee indicator with only one counter. The fee, determined by the two separate series of current impulses, therefore appears on the charge indicator in a certain number of value units.

The response of relay X is the signal to trigger the additional devices. By closing the contact ioox, the following circuit is established for relay J: earth, switching arm 6 dz, contacts 9g dz, ioox, winding of relay J, battery, earth. By closing the contact 97 , the magnet D7_ receives a pulse and switches its switching arms on. The circuit for relay J is opened at contact 99 dz and the magnet DZ is brought to waste by opening contact 97i. Closing the contact 99 dz causes the relay J to be energized again and thus a further switching of the switching arms. The play between your magnet DZ- and the relay J continues until the switching arms of DZ have reached their rest position.

By closing contact gi x, relay G is energized in the following circuit: earth, winding I of relay G, contacts 92db, 91x, switching arm 2db, resistor Wi6, battery, earth. By closing the contact 98 g, the magnet DB is switched on. which interrupts the circuit iiir relay G at contact 92 db. The game between the magnet DB and the relay G continues until the switching, Verk DB has reached its rest position.

Closing contact 95 x closes the following circuit for magnet D j of selector WR: earth, contact 95 x, winding of relay A i, contact 77 z0, switching arm zob in working position, contact 76p1, magnet D, battery, earth. In this circuit, only the relay A i responds, which closes its contact 69 a, and thus a circuit for the magnet ZO. The switching mechanism ZO is thereby switched on. At the same time, the contact 77v0 and thus the circuit for the relay A r is opened. By opening the contact 69 a1, the magnet ZO is made to drop and the relay A i is switched on at the contact 77zo. The game between the magnet ZO and A i continues until the switching mechanism ZO has reached its rest position. If all switching mechanisms are in the idle state, the holding circuit for the winding I of the relay X at the contact arms i db, zoe and 7d-- is interrupted, so that this is brought to waste.

In the example described, one factor is which one the registration facility is set, the zone while the number of registrations is determined in the registration device by the duration of the connection. Of course other factors, such as the tariff for day and night traffic, registered or otherwise taken into account during registration.

Fig. 3 shows a schematic representation of the most important parts of the registration device. If the calling subscriber hangs his handset at the end of the connection, the selector IVR (FIG. I) adjusts itself to the calling subscriber with the help of his rotary magnet D, as described. Simultaneously with the switching arms da and db, the identification disk SCH located on the same shaft is moved, which is designed as a template and carries the various combinations of holes for the calling subscriber on its outer ring. After adjusting to the calling subscriber, a very specific combination of holes, which identifies the calling subscriber, is compared to the guide piece FS and the punching pins ST3.

In the arrangement described, the counting operations were carried out such that two series of impulses one behind the other to the Registration device become effective, one of which is the identifier for the zone, the other the for the time contains. The first series of impulses acts, as described, on the magnet ZO. With the switching arms shown in Fig. I, this magnet sits on the same wave the zone marking disc ZKS (Fig. 3), which in a similar way is designed as a template like the subscriber identification disc SCH. Also the Zone identification disc has various combinations of holes on its outer circumference, in a number corresponding to the possible zones. The zone identification disc is therefore brought into a certain position, so that a certain combination of holes the guide piece FS and the punching pins ST4 are compared.

The second series of current impulses, which characterizes the number of time units, is then transmitted. This current impulse line acts on the punch magnet ST, which presses the punch pins ST3 and ST4 against the templates SCH and ZKS and the paper tape PS as often as current impulses are contained in the second series of current impulses. Of course, what is not shown here, the further transport of the paper tape takes place after each power surge. The magnet A117 with its punching pin ST5 is, as described earlier, actuated only once for each call. It is therefore made by this magnet, regardless of the position of the zone identification disc and regardless of how often the punch magnet ST the zone identification and 'participant combinations in the paper tape, only one punch made, so that it is immediately recognizable on the paper tape which combinations for the crediting of a conversation belong together and serve to credit the conversation that has just been held.

If one then looks at Aden shown in the lower part of FIG Section of the paper tape PS, the first heading f1 represents the number of connections the second B the zone identifiers and the third C the subscriber identifiers. Conversation a is thus conducted by a participant who has the identifier i, 3, 4, 5 carries, it can also be seen that the conversation was conducted after a zone, which is indicated by i, 3, and that this conversation takes place over three time units has extended.

The connections b; c, cd represent local connections. As stated earlier, the magnet ZO (FIG. i) remains unaffected in local connections, that is, if only a counting current impulse is transmitted. The perforated disk remains in the rest position, in which the guide piece FS and the punching pins ST4 are not opposed to any combination of holes. The three local connections b, c, d registered on the paper strip are from subscribers with the codes 2, 3, 6; i, 2, 4, 6 and a have been made. Connection e is established by a subscriber with the identifier 3, 5. This connection led into a zone which is indicated by 2. The picture also says that the connection lasted 5 time units. Connection f is in turn a local connection made by a subscriber with the hole combination z, 3, 4, 5, 6.

Claims (1)

PATENT CLAIMS: i. Circuit arrangement for accounting for charges in telecommunications systems, in particular telephone systems, in which, after the connection becomes subject to charges, for each of the factors determining the amount of the charge, identification current surges are transmitted to registration devices, characterized in that the individual factors (zone, tariff) characterize the charge determination Current surges a setting of the reg istrierelemente (ZKS) of the registration device (RE) in a position characteristic of these factors and the identification current surges for other factors (time) cause a multiple (for each current surge one) recording of the characters determined by the previous setting. a. Circuit arrangement according to Claim i, characterized in that the registration device (RE) is set by the current impulses characterizing the zone and further current impulses, the number of which depends on the duration of the connection, - cause repeated registration in accordance with the previous setting. 3. A circuit arrangement according to claim a, characterized in that the zone identifier is registered by the registration device as often as the time identification current surges arrive. Circuit arrangement according to Claim 2, characterized in that an identifier for the calling station is registered at the same time as the zone identifier. 5. Circuit arrangement according to claim 4; characterized in that the identifier for the calling station is registered with the zone identifier as often as the time-identifier current surges arrive. 6. Circuit arrangement according to _ @ nspruch i, characterized in that the registration device is brought into a position characterizing the calling line in cooperation with a selector (WR). ;. Circuit arrangement according to. @ Nspruch 6, characterized in that the registration device is coupled to a selector (IfjR), which is set to the calling line when a connection is identified as chargeable and thereby sets the registration device in a position characterizing the calling line. S. Circuit arrangement according to Claim 6, characterized in that the registration device is set into a position which characterizes the calling line only immediately before the start of the charge recording. G. Circuit arrangement according to Claim 6, characterized in that the setting of the registration device takes place after the final signal has been given by the calling subscriber station. 1o. Circuit arrangement according to Claim 6, characterized in that after the registration device has been set in a position characterizing the calling line, an incentive is sent to the device (Fig. 2) which emits charge current impulses (response of relay Y). i i. Circuit arrangement according to Claim i, characterized in that the registration device remains in the set position until after the end of the number of charge pulses. 12. Circuit arrangement according to _ # 1is claim i, characterized in that switching devices (ZZ) are provided, which are used to identify the @ @c rschiedenen factors for determining the charge current impulse groups over the subscriber line on a display device (GA) at the calling .Stelle ( TN) transferred. 13. Circuit arrangement according to - \ nspruch 12, characterized in that the display device at the intercom is equipped with as many surge receiving devices as drivers have to be identified by surge groups for determining the charges. 1d .. Circuit arrangement according to Claim 12, characterized. there; a converter (UR) cooperates with the registration unit, which converts the transmitted codes for the various factors into fee units and influences one of the number of fee units; of the charge display (GA) at the intercom.