JPH10155041A - Communication system, communication terminal equipment and network management equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system, communication terminal equipment and network management equipment by which an operator receives split count service without care. SOLUTION: In the case of making a call designating a split count mode (split count call) by a terminal side equipment PS5, a caller in a network side 4 discriminates whether or not the split count service is possible (whether or not a correct charge is possible according to the split count call), when the split count service is not possible, information to the effect that the split count service is not possible is informed to the terminal side equipment PS5, then the terminal side equipment PS5 displays information to the effect that the informed split count service is impossible on a display screen and a caller selects whether or not connection of a call is continued through the operation of a key input part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication system, a communication terminal device, and a network management device, and more particularly, to a communication system, a communication terminal device, and a network management device capable of performing a metering service.

[0002]

2. Description of the Related Art Recently, with the rapid progress of communication technology,
Various communication systems have been constructed. In this communication system, various communication terminal devices are connected to a communication network spread all over the country by wire or wirelessly. Also,
With the rapid progress of digital technology, various communication systems are also shifting from analog communication systems to digital communication systems.

[0003] In recent years, the number of wireless communication systems (such as mobile telephone systems) using digital technology has rapidly increased. This solves the problem that it is difficult to cope with the increase in the number of subscribers due to the limitation of the allocation of the used frequency and the problem that the confidentiality is difficult in the conventional analog system.

[0004] As one of the digital wireless communication systems, a second generation cordless telephone system (hereinafter, PHS: Personal Ha) using digital technology widely.
Ndyphone System). The wireless communication terminal (wireless telephone) used in the PHS has a feature that it can be used as a child device of a master device in addition to being used as a mobile phone.

That is, a radio telephone used in the PHS establishes a communication channel separately with a public radio base station and with a private radio base station which is a master unit of the radio telephone. In addition, a wireless zone in which a communication channel can be established between each base station and its own device is set in advance. However, the public wireless base station can be used from any wireless telephone, but the private wireless base station can only be used from a wireless telephone that is a slave of the private wireless base station.

In this PHS, an area used by a radio telephone is divided into small zones, each having a radius of about several hundred meters, called microcells. The system makes effective use of resources. In addition, since the zone (also referred to as a cell) is made smaller, the transmission output of the wireless telephone can be reduced as compared with a conventional mobile telephone or car telephone, so that the wireless telephone can be reduced in size and power consumption, and the battery can be reduced in size. And the operating time can be extended.

[0007] By the way, in the PHS, a metering service that allows the user to divide the billing destination when two parties make a call with one registered telephone number and register it (a "minute metering function" provided by the DDI Tokyo pocket telephone). Is provided. This metering service is a service that can divide call billing address into two places. Business call charges can be distributed to the company and private call charges can be distributed to the house at home. is there. Then, the sender can know the billing result by a bill or the like sent every month.

[0008]

However, in the case of using the above metering service, it is not known to which billing party the actual call charge has been added until the charge is made. There was a problem that the sender was uneasy because the billing destination was sometimes unclear.

[0009] The present invention has been made in view of the above problems, and has as its object to provide a communication system, a communication terminal device, and a network management device that allow an operator to receive a metering service with peace of mind.

[0010]

According to the first aspect of the present invention,
A communication terminal device which is connected to a communication line network and which can enjoy a metering service capable of dividing a plurality of billing destinations for call charges into a plurality of terminals. Means and a notifying means for notifying from the communication line network side after the calling means sends the information indicating whether the metering service is possible or not are provided.

That is, according to the first aspect of the present invention, in a communication terminal device which is connected to a communication line network and can enjoy a metering service capable of dividing a plurality of billing destinations for a call charge, A transmitting means for performing transmission by designating the metering service, and a notifying means for notifying from the communication network after the transmission of the transmitting means information indicating whether the metering service is possible or not. Is provided.

[0012] Therefore, when a call is made by specifying the metering service, information is sent to the user as to whether or not the notified metering service is possible. It has the effect of being accepted.

[0013] In this case, as in the second aspect of the present invention, after the notification by the notification means, a selection means for selecting whether or not to continue the call connection, and a selection result by the selection means. Transmitting means for transmitting to the communication network side,
A configuration may be provided.

Therefore, after the notification by the notifying means, the selecting means selects whether or not to continue the call connection, and the transmitting means transmits the result of the selection by the selecting means to the communication network side. Therefore, after notifying the information as to whether or not the notified metering service is possible, the operator can select the continuation or disconnection of the call by selecting the operator, so that the caller can receive the metering service with confidence. It works.

According to a third aspect of the present invention, there is provided a metering service capable of managing at least billing information of a communication terminal connected to a communication line network and dividing a plurality of billing destinations of a communication charge of the communication terminal. In a network management device capable of providing the following, the storage device storing the terminal identification information of the communication terminal device capable of the metering service and the billing destination information of the call charge in association with each other, When the designated outgoing call is made, the communication terminal device determines whether or not the metering service is possible with reference to the storage unit. The above problem is solved by providing a message notifying unit for notifying the communication terminal device of information indicating whether the total service is possible.

Therefore, when the terminal (communication terminal device) makes a call specifying the metering mode, the network side (network management device) determines whether or not the sender can perform the metering service. Since the configuration is such that information on whether or not the metering service is available is notified to the terminal, the caller can receive the metering service with ease.

In this case, the message notifying means may transmit the information indicating the billing destination of the metering service to the communication terminal after the communication terminal device ends the communication or before the communication. It is characterized by comprising a billing destination notifying means for notifying the device.

Therefore, in addition to the effect of the invention described in claim 3, the network side notifies the terminal of the "billing destination result" before or at the end of the call in the metering mode. Alternatively, at the end of the call, the billing destination of the call fee becomes clear.

According to a fifth aspect of the present invention, there is provided a communication terminal device connected to a communication line network, and a network management device for managing at least charging information of the communication terminal device. In a communication system capable of providing a metering service that can be divided into a plurality, it is determined whether or not the network management device can perform the metering service based on a call from the communication terminal device instructing the metering service. The above problem is solved by notifying the communication terminal device.

Therefore, since the terminal is informed of whether or not the metering service is possible, it is possible to clarify the billing destination of the call charge.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 8 show a communication terminal device of the present invention,
And a PHS to which a communication system is applied.

FIG. 1 is a system configuration diagram of a PHS (communication system). In FIG. 1, PHS1 is an ISDN (Integrated Services Digital Network) as a digital circuit network.
And a service management station 2b for managing the communication network 2a and providing various services.
, A DB (database) 2c for storing subscriber numbers, location registration information, billing information, etc., a line controller 4 connected to the communication line network 2a, and a base station 3 connected to the line controller 4. , And a wireless telephone (communication terminal device) PS5 or the like capable of transmitting / receiving to / from the base station 3 wirelessly.

In FIG. 1, the service management station 2b
Manages the PHS 1 and stores a table storing information such as a plurality of wireless telephone dial number data, a wireless telephone ID code of each wireless telephone, and an ID code of a wireless zone in which each wireless telephone is currently located. Have.

The service management station 2b transmits a call signal from the radio telephone PS5 via the communication network 2a or from the radio telephone PS5 via the base station 3, the line controller 4 and the communication network 2a. If received, the above table is searched based on the destination wireless telephone dial number data included in the call signal, and the wireless telephone ID code and location information stored corresponding to the destination wireless telephone dial number data are retrieved. Based on the wireless zone ID code, the base station having the wireless zone ID code is instructed to request transmission of a call signal to the wireless telephone PS5 having the wireless telephone ID code.

The line controller 4 connects to the communication network 2a in response to an outgoing request from the base station 3 or an incoming call request from the other party's telephone.
・ Transfer data to and from. In addition, each base station 3
2 manages the registration information of the metering service of the wireless telephone PS5 wirelessly connected to the telephone, as shown in FIG. 2, the dial ID (telephone number) of the wireless telephone, the presence / absence of registration of the metering service, and the billing destination information. And a table that associates

The communication line network 2a has a PSTN
(Public telephone network) or ISDN (Integrated Services Digital Network). The above is the overall configuration of the PHS.

FIG. 3 shows the radio telephone PS shown in FIG.
5 is an external view of FIG. In FIG. 3, the wireless telephone PS5
Is composed of an antenna 11 for transmitting / receiving a radio signal to / from the base station 3, a liquid crystal display unit 13 for displaying key input contents and various function guidance in the key input unit 12, a numeric keypad, a registration key and the like. Key input unit 12, a receiving speaker 14 for reproducing a receiving voice, a microphone 15 for inputting a transmitting voice, and a speaker 16 for acoustically notifying a user that the user is in a receiving state or a registered position.
It consists of.

FIG. 4 is a block diagram of the radio telephone PS5 shown in FIGS. The PS5 is configured as shown in FIG. 4, and includes an antenna 11, a radio unit 17,
Voice conversion circuit 18, speaker 14, microphone 15, telephone directory data memory unit 19, key input unit 12, display unit 13, program memory 20, work memory 21, and control unit 2
2 and so on.

The antenna 11 transmits and receives a transmission signal and a reception signal including a control signal and a voice signal of a predetermined frequency band to and from a public base station (not shown).
7 and outputs the received signal to the radio unit 17.

The radio unit 17 includes a frequency conversion unit, a modem unit,
It comprises a TDMA processing unit. The frequency conversion unit converts the transmission data input from the modem unit to a transmission signal of a predetermined radio frequency for wireless transmission to the base station and transmits the transmission signal from the antenna 11 or receives the reception data received from the base station by the antenna 11 The signal is frequency-converted and output to the modem unit.

The above-mentioned modem unit is, for example, an S / P (S
rial to Parallel), differential encoder,
It includes a signal mapping circuit, a Nyquist filter, a quadrature modulator, and the like, and performs π / 4 shift QPSK modulation / demodulation processing. That is, on the receiving side, the modem section demodulates the IF signal input from the frequency conversion section, separates it into IQ data, and outputs the data to the TDMA processing section as a data string. On the transmitting side, the modem unit creates IQ data from the data string input from the TDMA processing unit, and generates π / 4QP
SK modulation is performed and output to the frequency conversion unit.

The above TDMA (Time Division)
A Multiple Access (Time Division Multiple Access) processing unit performs frame synchronization and slot format processing on a control channel secured in a time-division manner, and transmits a control signal.

That is, the TDMA processing section performs the TDM
On the receiving side of the A processing unit, a slot is extracted at a predetermined timing from the data (frame) sent from the modem unit, and after scrambling to prevent eavesdropping is performed, configuration data is extracted from the format of this slot. Further, the receiving side of the TDMA processing unit sends the control data among the extracted configuration data to the control unit 22 and
The DPCM audio data is transferred to the audio conversion circuit 18. On the transmitting side of the TDMA processing unit, a slot is created by adding control data to the audio data transferred from the audio conversion circuit 18, and after scrambling, the slot is inserted into the frame at a predetermined timing. Output to the modem unit.

The audio processing circuit 18 compresses and decompresses digital audio data, specifically, an ADPCM (Adaptive Differential PC) using adaptive prediction and adaptive quantization.
The digital audio data is encoded and decoded by the M) method.

That is, on the receiving side of the codec section, the audio processing circuit 18 decodes the ADPCM audio data sent from the TDMA processing section into a PCM audio signal to expand the data, and the PCM performs analog / audio conversion of the audio signal.
In addition to performing the digital conversion process, the volume, ringer, tone signal, and the like are controlled and output from the speaker 14. The audio processing circuit 18 compresses the audio signal input from the microphone 15 on the transmission side and converted by the PCM into a PCM audio signal by encoding it into ADPCM audio data, and outputs it to the TDMA processing unit.

The telephone directory data memory unit 19 is constituted by a rewritable memory (for example, a RAM).
It has a memory area for storing telephone directory data, and stores telephone numbers, names, and addresses in association with each other.

The key input unit 12 includes a numeric keypad, an asterisk key, a hold key, a call key, a caller information notification selection key for selecting whether or not to notify a caller number, and a telephone directory data memory unit 7. It is provided with a registration key for registering telephone directory data, a display key for displaying a notified message, registered telephone directory data, and the like on the liquid crystal display unit 13, and a totaling service designation key for specifying a totaling service. I have.

The display unit 13 displays the telephone number, name, and telephone directory data input from the key input unit 12, the received caller number, information on whether or not the metering service can be received, and information on the billing destination result. Various kinds of information are displayed, and for example, it is configured by a liquid crystal display (LCD).

The program memory 20 has an access unit and a storage medium. The storage medium stores various control programs executed by the control unit 22, data, and the like.
As the control program, for example, there are a communication control program as a slave unit and a charging process program for a minute call transmission shown in the flowcharts of FIGS. These various control programs are stored in the form of program codes that can be read by the access unit. The storage medium is a magnetic, optical, or electric recording medium, and the storage medium is fixedly or detachably provided.

Further, the control program, data, and the like stored in the storage medium may be received from another device connected via a communication line or the like and stored in the storage medium.
Further, a storage device having a storage medium may be provided on another device connected via a communication line or the like, and a control program and data stored in the storage medium may be used via the communication line. .

The work memory 21 is used as a work area of the control unit 22, and includes a work memory for temporarily storing processing data of various processes under the control of the control unit 22.

The control section 22 is a control unit which comprises a CPU and controls the entire apparatus of the radio telephone PS5.
For example, the control unit 22 performs a process corresponding to a key input of the key input unit 12, or executes a communication control sequence as a slave based on a communication control processing program stored in the program memory 20.

That is, the control unit 22 executes a communication control sequence based on a wireless communication protocol with the base station,
For example, the communication control processing according to the communication control processing program, the display unit 13 of the telephone number input from the key input unit 8
And performs various processes such as driving a ringer to notify that there is an incoming call.

Further, the control unit 22 operates based on a charging process program for minute call transmission stored in the work memory 20.
A billing process for the minute total call described later is executed. That is, in response to the operation of the key input unit 12, the control unit 22 designates a call destination and makes a call specifying the metering service, and then determines whether or not the metering service is possible from the line control device 4. When the information to be indicated is notified, the display screen of the display unit 13 displays information as to whether or not the metering service is possible.
Select whether to continue the call connection according to the operation of.

Next, the operation will be described. The accounting process for the minute call transmission executed by the PHS1 will be described with reference to the flowchart of FIG. FIG. 5 is a flowchart for explaining the accounting process for the minute call origination executed by the PHS1.

First, a radio telephone PS5 (hereinafter referred to as "terminal")
In this case, a destination is specified, a calling operation is performed by a call (minute call) specifying a minute meter service, and an outgoing message added with data indicating a minute call is transmitted to the base station. The data is transmitted to the line controller 4 (hereinafter, referred to as "network side") via the station (step S1).

Next, when the network side receives the outgoing message of "minute call origination" (step T1), it refers to the subscription information of the minute service stored in the table (see FIG. 2) and refers to this terminal. Determines whether or not the subscriber has subscribed to the metering service, and determines whether or not “calling out a minute meter” is possible (step T2). As a result of the decision, you did not subscribe to the metering service,
If the "minute sum calling" is not possible, the terminal notifies the terminal "minute sum calling impossible" via the base station 4 (step T3). On the other hand, you have subscribed to the metering service,
If "minute call" is possible, the call is connected and call processing is performed (step T5).

When the terminal receives the message of “Minute call cannot be made”, the display screen of the display unit 13 displays, for example, FIG.
Is displayed to inform the operator that "calling a minute meter" is not possible (step S3). Next, the operator determines whether or not to continue the "call" connection, and if the operator operates the key input unit to select not to connect the "call", the process proceeds to step S9. Then, a message for stopping the "call" connection is sent to the network side via the base station, and the "call" is disconnected to terminate the calling operation. In this case, that is, when the "call" is disconnected on the terminal side (step T4), the processing on the network side is also terminated.

On the other hand, if it is determined in step S4 that the connection of the "call" is to be continued within a predetermined time, the state shifts to a call state (steps S5 and T4). (Steps S6, T6) In step T7, the network notifies the terminal of a "billing destination result" message. When the terminal receives the message "Chargeee result", it displays a message "Chargeee is xxx company" on the display screen of the display unit 13 as shown in FIG. 8 (step S8). As a result, at the end of the call, the billing destination of the call fee becomes clear.

As described above, in the accounting processing of the minute total call in FIG. 5 described above, when the terminal side makes a call specifying the minute total mode (minute total call), the network side makes a call. The caller determines whether or not the metering service is available (whether or not correct billing according to the calling for the metering is possible). If the metering service is disabled, the metering service is disabled. Is notified to the terminal side, and the terminal displays on the display screen the information that the notified metering service is not possible, and determines whether or not to continue the call connection. Is selected, the caller can make a call after confirming whether or not the metering service is possible, and the caller can receive the metering service with ease.

Further, in the accounting process of the minute call transmission shown in FIG. 5, the network notifies the terminal of a "billing destination result" message when the call is terminated, and the terminal displays the "billing destination result". When the message of "result" is received, the message is displayed on the display screen. Therefore, at the end of the call, the billing destination of the call fee is clarified, and the convenience of the operator is improved.

In the accounting process of the minute total call shown in FIG. 5, when the minute total call is recognized on the network side, the call is connected as it is, but the "minute total call" is recognized. In such a case, the terminal may be notified of a message indicating that "minute call" is possible.

Next, with reference to FIG. 6, another example of the accounting process for the minute call is described. FIG. 6 is a flowchart for explaining another example of the accounting process for the minute call transmission executed by the PHS1.

In the billing process for the minute total call shown in FIG. 5,
After the call is completed, the “billing destination result” is notified from the network side to the terminal. In the accounting processing for the minute total calling shown in FIG. 6, the “minute total calling” is performed on the network side. When it is determined that it is possible, the [billing destination result] is notified to the terminal, and the terminal checks the [billing destination result] and then determines whether to continue the call connection. .

In FIG. 6, first, the radiotelephone PS5
(Hereinafter, referred to as “terminal”) performs a call operation by “minute call” by designating the other party, and sends a message to which data indicating the minute call is added via the base station. It is sent to the line controller 4 (hereinafter referred to as "network side") (step T10).

Next, when the network side receives the outgoing message of "minute meter call" (T10), the caller refers to the subscription information of the meter service stored in the table (refer to FIG. 2), and determines the sender. It is determined whether or not the subscriber has subscribed to the metering service, and whether or not [calling out the meter] is possible (step T11). As a result of the determination, if the user does not subscribe to the metering service and cannot make a minute call, the terminal is notified of a “minute call impossible” message via the base station (step T12). . On the other hand, if the user has subscribed to the metering service and is able to make a “metering call”, he further refers to the billing destination information in the table (see FIG. 2) to send a “billing destination result” message. The terminal is notified (step T13).

When the terminal receives the message of "minutes cannot be called" or the message of "charging destination result" (step S11), it analyzes the contents of the message (step S12) and returns to the "minutes cannot be called". Is received, the process proceeds to step S13, and for example, a message such as "The metering service cannot be used" is displayed on the display screen of the display unit 13 as shown in FIG. If the message "Billing destination result" is received, step S1
4 and the display screen of the display unit 13 displays, for example, FIG.
Is displayed, a message such as “The billing destination is a XXX company.” Is displayed.

Next, in step S15, it is determined by the operator whether or not to continue the connection of the "call", and when the operator operates the key input unit 12 to select not to connect the "call". In step S18, the process proceeds to step S18.
A message for stopping the connection of the "call" is sent to the network side via the base station 3, and the "call" is disconnected to terminate the calling operation (step S18). In this case, that is, when the "call" is disconnected on the terminal side (step T14), the processing on the network side is also terminated.

On the other hand, if it is determined in step S15 that the connection of the "call" is to be continued, the state shifts to the call state (steps S16 and T16), and then the call ends (steps S17 and T16). T17), the accounting process for the minute total calling is ended.

As described above, in the accounting process of the minute total call in FIG. 6 described above, when the terminal side makes a call specifying the minute total mode (minute total call), the network side makes a call. The caller determines whether or not the metering service is possible (whether or not correct billing according to the calling for the metering is possible). If the metering service is not possible, the metering service is disabled. The terminal notifies the terminal of the fact that there is certain information. On the other hand, if the metering service is available, the terminal notifies the terminal of the "billing destination result". Is displayed on the display screen, and after confirming the content, it is determined whether or not to continue the call connection.

Therefore, the caller can confirm whether or not the metering service is available, and further, can confirm whether or not to call the user after confirming the billing destination of the call fee. The service can be used, and the convenience of the metering service is improved.

In the above-described embodiment, an example has been described in which the communication system of the present invention is applied to a PHS which is a wireless communication system, but it is needless to say that the present invention is not limited to this. For example, the present invention may be applied to a wired communication system such as PSTN or ISDN, or may be applied to a wireless communication system or a mobile phone system. In addition, the terminal is not limited to a telephone, but a PDA (Personal Digital As) having a communication function.
(Sistant) or the like, or a personal computer or the like provided with software having the above processing.

The number of billing destinations for the metering service is not limited to two, but may be three or more. The notification is not limited to the display, but may be another notification method, for example, sound, vibration, or the like. Further, the present invention is not limited to a wireless communication system, but may be a wired communication system.

[0064]

According to the first aspect of the present invention, when a communication terminal device makes a call specifying a metering service, the communication terminal device notifies the user of information indicating whether or not the metering service to be notified is possible. This makes it possible for the sender to receive the metering service with confidence.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the communication terminal apparatus, after notifying the information as to whether the notified metering service is possible or not,
Since the configuration is such that the caller selects whether to continue the call connection, the caller can receive the metering service with more assurance.

According to the third aspect of the present invention, the network management device determines whether or not the caller can perform the metering service when the communication terminal device makes a call specifying the metering mode. Since the configuration is such that information on whether or not the metering service is available is notified to the terminal, the caller can receive the metering service with ease.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, the network management apparatus notifies the "billing destination result" before or at the end of the call in the meter mode. With this configuration, there is an effect that the billing destination of the call fee becomes clear before or at the end of the call.

According to the fifth aspect of the present invention, the communication system notifies the communication terminal device whether or not the metering service is available from the network management device based on the transmission from the communication terminal device instructing the metering service. This makes it possible to clarify the billing destination of the call charge in the metering service.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system configuration of a PHS according to the present invention.

FIG. 2 is a diagram showing a data configuration of a table stored in the line control device of FIG. 1;

FIG. 3 is a diagram showing an external configuration of a PHS terminal.

FIG. 4 is a block diagram showing a circuit configuration of the PHS terminal.

FIG. 5 is a flowchart for explaining accounting processing for a minute call.

FIG. 6 is a flowchart for explaining another example of accounting processing for a minute call.

FIG. 7 is a first diagram showing a display example displayed on the display screen of the liquid crystal display unit 13;

FIG. 8 is a second diagram showing a display example displayed on the display screen of the liquid crystal display unit 13.

[Explanation of symbols]

 Reference Signs List 1 PHS 2a Communication network 2b Service management station 2c DB (database) 3 Base station 4 Line controller 5 Wireless telephone PS 11 Antenna 12 Key input unit 13 Liquid crystal display unit 14 Speaker 15 Microphone 17 Wireless unit 18 Voice conversion circuit 19 Phone book Data memory 20 Program memory 21 Work memory 22 Control unit

Claims (5)

[Claims] A communication terminal device connected to a communication line network and capable of receiving a metering service capable of dividing a plurality of billing destinations for call charges into a communication terminal device. And a notifying means for notifying, from the communication line network side, after the calling by the calling means, information indicating whether or not the metering service is possible. apparatus. 2. A communication system comprising: a selection unit for selecting whether to continue the call connection after the notification by the notification unit; and a transmission unit for transmitting a result of the selection by the selection unit to the communication network side. The communication terminal device according to claim 1, wherein: 3. A network management system that can manage at least charging information of a communication terminal device connected to a communication line network and provide a metering service that can divide call charges of the communication terminal device into a plurality of billing destinations. In the device, storage means for storing terminal identification information of a communication terminal device capable of the metering service and billing destination information of a call charge in association with each other; When the communication terminal device determines that the metering service is possible, the communication terminal device determines whether or not the metering service is possible by referring to the storage unit. And a message notifying unit for notifying the communication terminal device of information indicating whether or not the communication terminal device is present. 4. The method according to claim 1, wherein the message notifying means transmits information indicating a billing destination of the metering service after the end of the call of the communication terminal device.
4. The network management apparatus according to claim 3, further comprising a charging destination notification unit that notifies the communication terminal apparatus before a call. 5. A communication terminal device connected to a communication line network and a network management device for managing at least billing information of the communication terminal device, wherein the communication terminal device can be divided into a plurality of billing destinations for call charges. In a communication system capable of providing a possible metering service, the network management device notifies the communication terminal device whether or not the metering service is possible based on a call indicating the metering service from the communication terminal device. A communication system, comprising: