JPH10271232A - Telephone system - Google Patents

Abstract

(57) [Summary] [Problem] To provide a telephone system capable of smoothly inputting numerical information by a customer's push button operation during a conversation between a customer and an operator without particularly requiring an operator's telephone connection switching operation. It is to provide. The telephone relay means is connected to an exchange and relays a telephone signal from the exchange to supply it to a receiver, and the telephone relay means relays the push-button dial sound to a corresponding number in accordance with an algorithm for converting the same to a corresponding number. It is configured to include a conversion unit for converting a telephone signal, and a control unit for controlling a conversion operation timing of the conversion unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone system having a function of converting a push button dial sound to a corresponding number, and more particularly to a telephone system in which an operator receives a telephone call with a telephone receiver. The present invention relates to a telephone system that can be converted into a corresponding number.

[0002]

2. Description of the Related Art Hitherto, there has been proposed a system for transmitting information by using a push button dial sound emitted from a push button type telephone. For example, in a reservation system for train tickets, etc., a push button of a number (#, *) assigned to a number indicating a desired date, a vehicle number of a desired train, the number of tickets, etc., or control information is operated. By doing so, such information is notified.
Specifically, the push button dial sound generated by operating the push button is converted into a corresponding numeral, and the above information is determined from the obtained numeral string.

[0003] Such a conventional system is realized by using the function of a device (voice response device) for performing automatic voice response (unattended correspondence with a customer). This voice response device is separated from a normal telephone and is independently connected to an exchange.

[0004]

In recent years, there have been proposed systems for performing bank transactions by telephone, systems for performing credit card settlement by telephone, and the like. In such a system, when talking to the operator over the telephone, the security code is not transmitted directly to the operator to identify the customer, but is transmitted by operating the push button. preferable.

[0005] Therefore, when such a system is realized by using the above-described voice response device, the input and output of a personal identification number and the like by push-button operation are performed during the conversation between the operator and the customer. Has to be switched from the operator's phone to the voice response unit. Then, after the input process of the password or the like by the push button operation is completed, it is necessary to switch the connection of the telephone from the customer from the voice response device to the telephone of the operator again.

[0006] The connection switching from the telephone of the operator to the voice response device is performed according to the instruction of the operator. Further, the connection switching from the voice response device to the telephone of the operator is performed after the voice response device performs a process of converting a push button dial tone into a number and a process of confirming a password consisting of the converted number sequence. It is performed under the control of.

As described above, in the conventional system, in order to perform the input process of the personal identification number by the push button operation,
The connection of the telephone from the customer must be switched between the telephone of the operator and the voice response device, and the operation of switching the telephone connection by the operator is troublesome. In addition, since the customer must wait for the push dial operation and the conversation with the operator again until the telephone connection switching process is completed, the input of the password and the like by the push button operation can be smoothly performed during the conversation between the operator and the customer. Can not be done.

Accordingly, an object of the present invention is to provide a telephone which allows a customer to input information by a push button operation during a conversation between the customer and the operator without particularly requiring the operator to switch the telephone connection. Is to provide a system.

[0009]

In order to solve the above problems, a telephone system according to the present invention is connected to an exchange, and relays a telephone signal from the exchange to a receiver. Telephone relay means for supplying, conversion means for converting a telephone signal relayed by the telephone relay means according to an algorithm for converting a push button dial sound to a corresponding number, and control means for controlling conversion operation timing of the conversion means It is comprised so that it may have.

[0010] In such a system, after the operator informs the customer that the push button operation will be performed during the conversation with the customer, the conversion means sends the telephone relay means under the operation timing control of the control means. And converts the relayed telephone signal according to an algorithm for converting the push button dial sound to a corresponding number. At the operation timing of the conversion means, when a push button dial sound corresponding to a customer's push button operation is input as a telephone signal, the telephone signal is converted into a number (including numbers and symbols) corresponding to the push button dial sound.

In the control of the operation timing of the conversion means by the control means, at least the conversion operation start timing and the conversion operation end timing are controlled. The conversion operation start timing can be determined, for example, based on a predetermined activation operation by the operator or based on predetermined words uttered by the operator. The conversion operation end timing
For example, it can be determined after a lapse of a predetermined time from the start time of the conversion operation, or based on a predetermined end operation of the operator.

Whether or not the state in which the telephone signal relayed by the relay means is supplied to the receiver at the operation timing of the conversion means may be determined. In particular, from the viewpoint of improving security when inputting information such as a password by operating a push button, the present invention further provides the above-mentioned conversion means by the timing control of the control means. It is possible to have a means for interrupting the supply of the telephone signal relayed by the telephone relay means to the receiver during the conversion operation of the telephone signal.

In such a system, even if the push button dial sound is input to the relay means at the operation timing of the conversion means, it is not provided to the receiver. Therefore,
Other people will not hear the push button dial sound. From the viewpoint that the operator can recognize whether or not the operation of converting the push button dial sound is performed when the supply of the telephone signal to the receiver is cut off as described above, the present invention relates to claim 3 As noted,
Further, it may be configured to have a sound source that outputs a predetermined sound signal and a unit that supplies a sound signal from the sound source to the receiver while the supply of the telephone signal to the receiver is cut off.

The sound signal output from the sound source may correspond to one or a plurality of independent sounds or may correspond to music. The operator recognizes that the conversion operation is being performed while a predetermined sound is being heard from the handset.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a telephone transaction support system to which a telephone system according to an embodiment of the present invention is applied. This telephone transaction support system is a system for supporting transactions at a bank or the like performed over a telephone, presenting information about a customer of a telephone partner to an operator, inputting transaction details, and inputting transaction details. Perform processing such as approval.

In FIG. 1, a plurality of client terminals 1
0 (1),. . . , 10 (n), 12 and 13 (1),
13 (2) is connected to the LAN. Each client terminal 10 (1),. . . , 10 (n) are terminals for receiving telephone transactions from customers, and are hereinafter appropriately referred to as reception terminals. The client terminal 12 is a terminal for monitoring the system, and is hereinafter referred to as a monitoring terminal as appropriate. The client terminals 13 (1) and 13 (2) are terminals for approving the bank transaction accepted by each accepting terminal,
Hereinafter, it is called an approval terminal as appropriate.

Further, a database server 14, a printer unit 16, a communication server 18, and a voice response unit (VRU) 22 are connected to a LAN. The database server 14 manages various files shared in the system. The printer unit 16 includes each client terminal and the data server 1.
4 and print out transaction journals, reports, contracts, etc. The communication server 18 is connected to the host computer of the bank, and transfers the contents of the transaction approved in the system to the host computer. The voice response device 22 has a function similar to each reception terminal, and performs a process related to a telephone transaction with a customer by an automatic response function.

The exchange 20 (P) connected to the public line 30
BX / ACD), each reception terminal 10 (1),. . . ,
10 (n) and the voice response device 22 are connected. The exchange 20 basically receives an external call from the voice response device 22.
Connect to The exchange 20 has an automatic call distribution function (ACD), and external calls (calls from customers) can be received at each reception terminal 10 according to a predetermined algorithm.
(1),. . . , 10 (n).

When an external call is connected, the voice response device 22 performs a voice response according to a predetermined procedure. Each reception terminal 10 (1),. . . , 10 (n) have a telephone communication function. And each reception terminal 10
(1),. . . , 10 (n) of the telephone headsets 11 (1),. . . , 11 (n) to answer calls from customers.

Each of the receiving terminals 10 (1),. . . , 10
(N) is configured, for example, as shown in FIG.
2, a reception terminal includes a control unit 101 including a so-called CPU, a memory unit 102, a display unit 103, an input unit 104, and a disk unit 10.
5, LAN unit 106, built-in telephone unit (TAP
I: Telephony Application Program Interface) 10
7 and a CD-ROM drive unit 110. These units are connected via a system bus B. In addition, the built-in telephone unit 107 includes:
A sound board 108 and a sound source 109 are connected.

The control unit 101 controls the terminal as a whole and, as described later, executes processing relating to acceptance in telephone transactions. The memory unit 102
M, including a memory such as a ROM, and stores a program to be executed by the control unit 101, necessary data obtained in the course of processing, and the like. The display unit 103 is a CRT or LC
D (liquid crystal display panel), etc., and displays various kinds of guidance and scripts for the operator, information on customers, and the like. The input unit 104 includes a keyboard, a mouse, and the like, and is used by a reception operator to input information to the reception terminal.

The LAN unit 106 is connected to the LAN, and performs data communication with the LAN. The built-in telephone unit (TAPI) 107 is connected to the exchange 20 (PBX).
/ ACD) and performs voice communication with the exchange 20. That is, the built-in telephone unit 107 relays a telephone signal (voice signal, push button dial sound) from the customer via the exchange 20 and supplies it to the telephone headset 11, and the voice signal from the telephone headset 11 is transmitted to the built-in telephone unit. 107 supplies the data to the exchange 20 via the relay. Thus, the operator responds to a telephone call from the customer via the telephone headset 11.

The built-in telephone unit 107 has a switch mechanism SW as shown in FIG. The switch mechanism SW performs a switching operation of selecting either a telephone signal from the exchange 20 or a sound signal from the sound source 109 as a signal to be supplied to the telephone headset 11. The sound signal from the sound source 109 corresponds to, for example, predetermined music. Therefore, this switch mechanism SW
The telephone headset 11
, The user can switch and listen to the voice from the customer or the music from the sound source 109.

The telephone signal from the exchange 20 is relayed by the built-in telephone unit 107, and is also supplied to the sound board 108. The sound board 108 has a sound buffer (not shown) and has a function of recording and reproducing telephone signals. The CD-ROM 200 includes
A program that describes processing related to reception in telephone transactions is stored. The processing related to the reception in the telephone transaction includes the registration processing of the customer, the reception processing of the telephone transaction, and the processing of converting the push button dial sound into the corresponding number. The program is installed in the disk unit 105 from the CD-ROM 200 set in the CD-ROM drive unit 110. Then, when starting up the reception terminal, the disk unit 10
5 is read from the memory unit 1
02 is stored. In this state, the control unit 101
The (CPU) executes a process related to reception according to a program stored in the memory unit 102.

The process of converting the push button dial sound to the corresponding number according to the present invention is realized by, for example, a function (program) as shown in FIG. 4 of each reception terminal. In FIG. 4, a function AP for converting a push button dial sound of a reception terminal into a corresponding number includes a push input control unit 201, a push conversion routine 202, a recording control unit 203, and a number storage unit 204. The push input control unit 201 includes the input unit 104
The built-in telephone unit (TAPI) 107 is controlled to capture the push button dial sound based on the control information generated by the predetermined operation. As a result, a telephone signal (push button dial sound) relayed to the telephone built-in telephone unit 107 is supplied to the sound board 108. At this time, based on a control signal from the push input control unit 201, the switch mechanism SW (see FIG. 3) in the built-in telephone unit 107 converts a signal to be supplied to the telephone set 11 from a telephone signal from the exchange 20 to a signal from the sound source 109. Switch to music signal.

The recording control unit 203 includes the built-in telephone unit 1
The control for storing the telephone signal supplied from 07 to the sound board 108 in the sound buffer is performed. Also,
The recording control unit 203 also performs control for supplying the telephone signal stored in the sound buffer to the push conversion routine 202 at a predetermined interval (for example, about 0.1 second).

The push input control section 201 activates a push conversion routine 202 based on the timing at which the predetermined operation is performed. The activated push conversion routine 202 converts the telephone signal read from the sound buffer according to a predetermined algorithm for converting a push button dial sound into a corresponding number. Then, the code data of the number obtained by the push conversion routine is stored in the memory unit 102 under the control of the number storage unit 204.

After a predetermined time (for example, 10 seconds) elapses after the push conversion routine 202 is started, the push conversion routine 202 ends the conversion operation under the timing control of the push input control unit 201. At this time, the signal to be supplied to the telephone headset 11 based on the control signal from the push input control unit 201 is switched from the music from the sound source 109 to the telephone signal from the exchange 20 so that the signal is supplied from the built-in telephone unit 107. The switch mechanism SW is controlled. In this state, the direct conversation between the customer and the operator via the telephone is resumed.

In the above-mentioned system, a process for inputting a personal identification number is performed in accordance with the procedure shown in FIG. In FIG. 5, when detecting that a call (telephone) from a customer has arrived at built-in telephone unit 107 (S1), control unit 101 causes display unit 103 to display a screen for bank transaction support (S2). In this state, the operator has a conversation with the customer via the telephone.

The control unit 101 further determines whether or not a calling number (customer telephone number) has been notified when a call from the customer is received (S3). If no calling number notification is made (S3, No), the control unit 101
Causes the display unit 103 to display guidance for requesting input of search conditions for customer information (information about the customer) (S4). The operator who sees this guidance hears information about the search conditions (account number, customer's telephone number, name, customer number, etc.) from the customer through the telephone, and inputs the information to the reception terminal using the input unit 104. The input information is displayed on the screen of the display unit 103.

On the other hand, when the calling number is notified (S
3, Yes), the control unit 101 sets the number to the corresponding condition (telephone number) (S5). Therefore,
In this case, the telephone number of the customer is displayed on the screen of the display unit 103 as a search condition from the beginning. When the input of the search condition is completed, the control unit 101 communicates with the database server 14 via the LAN unit 106,
The basic information in the database server 14 is searched using the search conditions input as described above (S6). Here, the basic information is basic information about the customer, such as a telephone number,
Includes name, address, date of birth, gender, etc. If the basic information of the customer is already registered in the system (S7, Ye
s), the control unit 101 transmits to the database server 14
From the LAN unit 1
06, the basic information is taken into the memory unit 102. Then, the basic information is displayed on the screen of the display unit 103.

Thereafter, the control unit 101 further requests the host computer (account system) via the communication server 18 to search for account information (account inquiry, history inquiry, etc.) of the customer based on the customer basic information ( S
9). Then, search results (account information) at the receiving terminal
Is received, the control unit 101 causes the display unit 103 to display the account information (S9).

Thereafter, the operator proceeds with the conversation with the customer while looking at the basic information (name, gender, date of birth, address, etc.) and account information of the customer speaking through the telephone. Therefore, the operator can know information about the customer before conducting a telephone transaction with the customer. As described above, in a state where various kinds of information on the customer are displayed on the screen of the display unit 103, the input process of the personal identification number is continuously performed as follows in order to confirm the customer.

The operator informs the customer via the telephone that he / she will input the personal identification number by operating the push button. When the operator performs a predetermined operation using the input unit 104 (for example, a click operation of a script “Verify the identity” displayed on the screen), the control unit 101 performs a push operation based on the operation. An input command is generated (S10). Based on the push input command, the switch mechanism SW of the built-in telephone unit 107
Switches the signal to be supplied to the telephone headset 11 to music from the sound source 109. Thereby, the operator recognizes that the input process of the personal identification number is being performed by the music heard through the telephone headset 11.

Further, based on the push input command, a telephone signal from the exchange 20 via the built-in telephone telephone unit 107 is sampled in a sound buffer in the sound board 108 for a predetermined time (for example, up to 10 seconds) (S11). . At this time, when the customer operates the push button corresponding to the password, the push button dial sound corresponding to the operation is stored in the sound buffer (S11). Then, the control unit 101 transmits the telephone signal recorded in the sound buffer to the memory unit 10.
Then, a push button dial sound is cut out from the telephone signal (S12). Further, the control unit 101
The cut-out push button dial sound is converted into a corresponding number according to a predetermined algorithm (S12).

The number sequence thus obtained is set in a predetermined register as a password. Then, the control unit 101 searches for a password registered in advance as corresponding to the account number obtained as described above (S13), and searches the retrieved password and the password set in the register. Is determined (S14). If they do not match, the input process of the password by the push button operation is performed again (S10 to S14). If the password input by the push button operation performed by the customer does not match the password registered three consecutive times (S15, No), the control unit 101 indicates that the bank transaction by telephone is refused. The password is displayed on the screen of the unit 103, and the input process of the personal identification number ends.

In the course of the above processing, the control unit 101
Means that the determination of the coincidence or non-coincidence of the passwords is completed after the push input command command is generated (S14, S1
Until 5), switch SW of built-in telephone unit 107
3 (see FIG. 3), the music from the sound source 109 is supplied to the telephone headset 11 instead of the telephone signal from the exchange 20. Therefore, the operator can recognize that the system is performing the input process of the personal identification number while the music is being heard from the telephone headset 11. In addition, such switching is preferable from the viewpoint of security, since the dial sound of the push button operated by the customer cannot be heard by the operator while the music is being heard.

When the determination of the coincidence or non-coincidence of the personal identification numbers is completed, the control unit 101 returns the switch SW of the built-in telephone unit 107 to the original state. As a result, the operator can talk with the customer via the telephone. Here, if the message of transaction refusal is not displayed on the screen of the display unit 103, thereafter, the operator hears the details of the transaction from the customer by telephone and inputs the information to the reception terminal device. On the other hand, if the message of transaction refusal is displayed on the screen of the display unit 103, the operator sees it and determines that the owner of the bank account cannot be identified, and refuses the current transaction to the customer.

If the basic information of the customer has not been registered in the above process (S7, No), the control unit 101 determines that the customer is a new customer and displays the basic information of the customer on the display unit 103. An input request message is displayed (S17). The operator sees this message, asks the customer about basic information, and inputs the information to the reception terminal. When the control unit 101 acquires the input basic information (S18), a predetermined new registration process S19 is executed.

The above system is an example in which a personal identification number for performing a bank transaction by telephone is input by a push button operation. For example, the same system can be applied to the case of card settlement in so-called telephone shopping. . In this case, the card number and the password number used by the customer are input by the push button operation. The specific process is performed by a computer terminal device similar to the reception terminal, for example, according to the procedure shown in FIG.

As in the case of the bank transaction, when it is recognized that a telephone call has been received from the customer (S21), information on the reception of telephone shopping is displayed on the screen of the display unit (S22). If the received call includes a calling number (telephone number) notification, information on the customer is searched using the calling number as a search condition (S25).
On the other hand, if the received call does not include the calling number notification,
A message for requesting input of information about the customer is displayed on the screen of the display unit (S2).
4). Looking at this display, the operator sends information about the customer from the customer (address, name, age, gender, date of birth, etc.)
And input it to the terminal device.

Then, the system further acquires the type of card to be settled for telephone shopping, which the operator has heard and input from the customer (S26). here,
A request for inputting a card number is displayed on the screen of the display unit (S27), and when a predetermined operation is performed after the operator who sees the request informs the customer of the request, a push input command is generated (S27). .

In the same manner as in the case of the above-mentioned banking transaction, the processes of recording the push button dial sound (S28), extracting the push signal from the recorded signal and converting it to the corresponding number (S29) are carried out. Done.
Then, after a predetermined time has elapsed from the generation of the push input command, the input process of the card number ends (S30). When the card number input process is completed in this way, a message for requesting the input of a personal identification number is further displayed on the screen of the display unit (S31).

During the above-mentioned card number input processing, music is supplied to the telephone headset of the operator as in the case of the above-mentioned bank transaction, and when the card number input processing is completed, music is supplied again. A telephone from the customer is connected to the operator's telephone headset. And
The operator is notified of the input of the operator's password after seeing the message for requesting the input of the password, and when a predetermined operation is performed, a push input command is generated again (S31).

As in the case of the card number input processing, each of the push button dial sound recording processing (S32), the cut out of the recorded signal to the push button dial sound, and the conversion to the corresponding number (S33). Processing is performed. Then, the personal identification number registered corresponding to the card specified by the card number obtained as described above is searched (S34), and the searched personal identification number and the personal identification number obtained as described above are searched. It is determined whether or not matches (S35).

If the passwords match, the password input processing is terminated, and thereafter, processing for settlement by card is performed. On the other hand, if the passwords do not match, the input process of the password is performed again (S31 to S35). As in the case of the above-described bank transaction, a transaction rejection message is displayed on the display unit (S37). In this case, the operator
Transaction (card payment) because PIN could not be matched
Tell the customer that it cannot be done.

In each of the above examples, the telephone signal from the exchange 20 relayed by the built-in telephone unit 107 of the terminal device is fetched into the terminal device without sending it to an external unit, and the original processing (bank transaction processing, card processing, etc.) is performed. As part of settlement processing, etc., a push button dial sound is extracted from the fetched telephone signal and converted into a corresponding number. Therefore, it is not necessary to switch the connection between the operator and the voice response device for converting the telephone call from the operator to the corresponding number of the push button dial sound as in the related art, and the customer can be handled smoothly. Becomes

In each of the above examples, the built-in telephone unit 107 corresponds to the telephone relay means, and performs the processing in steps S11 and S12 in FIG. 5 and the processing in step S2 in FIG.
8, processing in S29 and step S32 in FIG.
The processing in S33 corresponds to means for converting a telephone signal according to an algorithm for converting a push button dial sound to a corresponding number. These processes are performed by the recording control unit 203 and the push conversion routine 20 of the reception terminal device.
2 (see FIG. 4).

The processing in step S11 in FIG. 5 and the processing for terminating the personal identification number, the processing in steps S27 and S30 in FIG. 6, and the processing in step S31 and the termination of the personal identification number in FIG. 6 correspond to the control means.
These processes are performed by the push input control unit 2 of the reception terminal device.
01 (see FIG. 4). Further, a switch SW provided in the built-in telephone unit 107 corresponds to a unit for interrupting the supply of the relayed telephone signal to the receiver,
The switch SW also corresponds to a means for supplying a sound signal from the sound source to the receiver while the supply of the telephone signal to the receiver is cut off.

[0050]

As described above, according to the first to third aspects of the present invention, the telephone signal to be supplied to the receiver relayed by the telephone relay means corresponds to the push button dial sound. They are converted to numbers.
Therefore, during the conversation between the customer and the operator, the input of the information by the push button operation of the customer can be smoothly performed without particularly requiring the operator to switch the telephone connection.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a telephone transaction support system to which a telephone system according to the present invention is applied.

FIG. 2 is a block diagram showing a hardware configuration example of a reception terminal device in the system shown in FIG.

FIG. 3 is a diagram showing switches included in the built-in telephone unit shown in FIG. 2;

FIG. 4 is a block diagram illustrating a functional configuration example of a telephone system in the reception terminal device.

FIG. 5 is a flowchart illustrating an example of a procedure of a password input process in a bank transaction receiving process;

FIG. 6 is a flowchart illustrating an example of a procedure for inputting a card number and a password in a card shopping reception process of telephone shopping.

[Explanation of symbols]

10 (1),. . . , 10 (n) reception terminals 11 (1),. . . , 11 (n) Telephone headset 12 Monitoring terminal 13 (1), 13 (2) Approval terminal 14 Database server 16 Printer unit 18 Communication server 20 Exchange 30 Public line 101 Control unit 102 Memory unit 103 Display unit 104 Input unit 105 Disk Unit 106 LAN unit 107 Built-in telephone unit 108, sound board 109 Sound source 110 CD-ROM drive unit 200 CD-ROM 201 Push input control unit 202 Push conversion routine 203 Recording control unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyofumi Akita 4-1-1 Kamikadanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Co., Ltd. (72) Inventor Emission Shigeru 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture No. 1 Inside Fujitsu Limited (72) Inventor Takayasu Koike 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside 1-1 Fujitsu Limited (72) Hidetoshi Tsujiuchi 4-chome, Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture No. 1 Inside Fujitsu Limited

Claims (3)

[Claims] 1. A telephone relay means connected to an exchange, for relaying a telephone signal from the exchange and supplying it to a receiver, and relayed by the relay means in accordance with an algorithm for converting a push button dial sound into a corresponding number. A telephone system comprising: conversion means for converting a signal; and control means for controlling conversion operation timing of the conversion means. 2. The telephone system according to claim 1, further comprising: while the conversion means is performing a telephone signal conversion operation by timing control of the control means, to a receiver of the telephone signal relayed by the telephone relay means. Telephone system having means for interrupting the supply of electricity. 3. The telephone system according to claim 2, further comprising: a sound source for outputting a predetermined sound signal; and means for supplying a sound signal from the sound source to the handset while the supply of the telephone signal to the handset is interrupted. Telephone system with a.