JPH02168792A - Telephone system - Google Patents

Abstract

PURPOSE:To answer an incoming call from an ISDN with an analog and digital signal transmission/reception terminal equipment by providing a D/A conversion means, an A/D conversion means and a communication path control means. Thus, to utilize the analog signal transmission/reception terminal equipment by connecting them. CONSTITUTION:When an ISDN trunk circuit 3 detects a call request, it is investigated whether or not 'an incoming sub-address' is included. When the incoming sub-address is not included, it is informed to all connection telephone sets that the incoming call from an ISDN circuit 32 is requested. In this case, additional information is simultaneously outputted to digital telephone sets 11 and 12 and the additional information is displayed from the display of the telephone sets. The ISDN ringer circuit 91 of an extension analog trunk circuit 9 is actuated for an analog telephone set 13 and a ringer tone for ISDN being an incoming call indicating the incoming call from the ISDN circuit 32 is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone system connectable to ISDN or to ISDN and a public telephone network.

[Background Art] With the development of digital processing technology and communication technology, the demand for direct digital communication between information processing devices in remote locations has increased, and ISDN has emerged as a communication line network capable of digital communication. .

[Problems to be Solved by the Invention] However, with ISDN, all communication information is sent as digital communication information.

For this reason, analog signal transmitting/receiving terminal devices (hereinafter referred to as rsL
TJ) could not be connected to ISDN and receive data.

[Means for Solving the Problems] The present invention was made for the purpose of solving the above-mentioned problems, and its purpose is to provide a telephone system that can be connected to ISDN or to ISDN and the public telephone network. .

This embodiment has the following configuration as a means for achieving the above-mentioned object.

That is, the telephone system is connected to ISDN and can accommodate at least an analog signal transmitting/receiving terminal device connecting extension line and a digital signal transmitting/receiving terminal device connecting extension line, and includes a D/A conversion means for converting digital communication information into corresponding analog communication information. , A/D conversion means for converting analog communication information into corresponding digital communication information, and communication path control means for controlling communication paths between the ISDN connection line and the storage extension line.

Furthermore, when an analog signal transmitting/receiving terminal device responds to an incoming call request from ISDN, it notifies the calling party that the analog signal transmitting/receiving terminal device has responded, and also informs the calling party that the analog signal transmitting/receiving terminal device responds to an incoming call request from ISDN. A notification means is provided to notify a certain thing.

Furthermore, it includes a collection means for collecting communication history, and a storage means for storing the communication history collected by the collection means.

Alternatively, when there is an incoming call request from the ISDN, means is provided for outputting the incoming call request to at least the connecting extension specified by the call service information from the ISDN.

In addition, as another means for solving the above-mentioned problems, there is a telephone system that is connected to the public telephone line network and the ISND network and can accommodate analog signal transmitting/receiving terminal device connecting extensions and digital signal transmitting/receiving terminal device connecting extensions. , a D/A conversion means for converting digital communication information into corresponding analog communication information, an A/D conversion means for converting analog communication information into corresponding digital communication information, and communication path control between the ISDN connection line and the storage extension line. and communication path control means for controlling the communication path.

Furthermore, the mobile phone includes charging means for performing predetermined charging processing when responding to an incoming call from the public telephone network.

[Operation] With the above configuration, an incoming call from ISDN can be answered by the analog signal transmitting/receiving terminal device and the digital signal transmitting/receiving terminal device connected to the extension.

This makes it possible to connect and use conventional analog signal transmitting/receiving terminal equipment, making effective use of resources,
Furthermore, additional services of ISDN can be fully utilized.

[Example 1] Hereinafter, an example according to the present invention will be described in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a block diagram of an embodiment according to the present invention. In the figure, 11 to 14 are extension terminal devices connected to the main device 100, and 31 is an extension terminal connected to the subscriber telephone line. Connection line, 32 is IS
Connection lines to the DN include 100 a main device, 200 a public line network, and 300 an ISDN.

In the extension terminal device, 11.12 is an extension digital telephone, and the main device 100 is a digital signal line 21.22.
connected via. Reference numeral 13 denotes an extension analog telephone set, which is connected to the main device 100 via an analog signal line 23. Reference numeral 14 denotes an input/output device connected to the main device 100 via a digital signal line 24, which is equipped with a display, a keyboard, etc., and which also functions as a system console in this embodiment for inputting and outputting various information.

In this embodiment, for the sake of simplicity, the subscriber telephone line and rsDN line are one line, and the number of extensions is four from 21 to 24.
The explanation will be given using the case of a line as an example.

However, this embodiment is not limited to the above number of lines.

In the main device 100, reference numeral 1 denotes a control unit that controls the entire embodiment according to the programs shown in FIGS. It also performs communication control in accordance with standards, and control for constructing/opening communication channels for subscriber telephone lines (public lines) in accordance with standards.

2 is a subscriber telephone line trunk circuit that controls the interface with the subscriber telephone line 31, 3 is the ISDN rank circuit that controls the interface with the ISDN line, and 4 is the connected subscriber telephone line 31, ISDN line 32, and extension terminal device. The exchange processing unit 5 is a memory that temporarily stores processing information in this embodiment in addition to the above-mentioned program, and information about the attributes of each connected extension and the extensions connected to the extension. Management table 5a for registering telephone attributes, etc.
, a call history table 5b that stores the call history for a certain period of time in the past for each extension telephone.

6 is a voice response processing unit which stores digital voice signals corresponding to various response analog voice information in a built-in message registration unit 6a, reads out and outputs a desired response digital voice signal under control of the control unit 1; Subscriber telephone line 31
a billing processing unit 8a that performs all departmental processing in the case of a call to
8b is an extension digital trunk circuit that interfaces with the extension digital telephones 11 and 12; 9 is an extension analog circuit that interfaces with the extension analog telephone 13; and 10 is an input/output device interface that interfaces with the input/output device 14. .

FIG. 2 shows a detailed block configuration of the extension digital telephone of this embodiment. In FIG. 2, a dedicated digital telephone 11
is shown as an example, but the digital telephone 12 also has substantially the same configuration.

In the figure, 111 is a ROM], a DCPU which controls the entire digital telephone according to the program stored in 12;
12 is a DROM that stores the above-mentioned programs as well as parameters used in this device, 113 is a DRAM that stores transmitted and received data, etc., and 114 is an ISDN interface (ISDN I/F) that controls the interface with the extension digital trunk circuit 8. ), 115 is ISDN/I/F11
4 converts the digital signal into a corresponding analog signal and outputs it from the receiver of the handset 116, converts the analog signal from the transmitter of the handset 116 into a corresponding digital signal, and outputs it to the ISDN/I/F 114. 116 is a handset; 117 is a keyboard including dial keys, control keys, etc.; 118 is a keyboard 1;
119 is a display, and 120 is a display control unit that controls the display of the display 119.

FIG. 3 shows a partially detailed block diagram of the extension analog trunk circuit of this embodiment. FIG. 3 mainly shows a configuration specific to this embodiment, and a part of a general extension analog trunk circuit configuration is not shown.

In FIG. 3, 91 is an analog telephone set.
N Indicates that an incoming call request has come from 300.
An ISDN ringer circuit outputs a DN ringer signal; 92 is a subscriber line ringer circuit that outputs a subscriber ringer signal indicating that there is a call from the subscriber line network 200; , ringer signal and ISDN for subscribers
It can be easily distinguished from the standard ringer signal. When the extension analog trunk circuit 9 is connected to the ISDN line 32, the selector 93 converts the digital signal from the ISDN line 32 into a corresponding analog signal.
A digital-to-analog converter (D/A converter) 94 is used to send signals from the analog telephone to the signal line 23 via the selector 96 when the extension analog trunk circuit 9 is connected to the ISDN line 32. an analog-to-digital converter (A/D converter), 9 for converting the analog signal received into a corresponding digital signal and sending it to the exchange processing unit 4;
5 is a call detection circuit that detects a call state such as a call request due to off-hook of the handset of the analog telephone 13 or termination of communication due to on-hook of the handset, etc.; 96 is a signal when the extension analog telephone is connected to the ISDN line 32; A D/A converter 93 and an A/D converter 94 are interposed between the line 23 and the switching processing section 4, and when the extension analog telephone and the subscriber telephone line 31 are connected, the signal line 23 and the switching processing are interposed between the signal line 23 and the switching processing section 4. This is a selector for direct connection with the section 4.

A partially detailed block diagram of the extension digital trunk circuit of this embodiment is shown in FIG. FIG. 4 mainly shows the configuration specific to this embodiment, and a part of the general extension digital trunk circuit configuration is not shown.

In FIG. 4, when the extension digital trunk circuit 9 is connected to the subscriber telephone line 31, 83 converts the digital signal sent from the digital telephone via the selector 86 into a corresponding analog signal, A digital-to-analog converter (D/A converter) 84 converts the analog signal from the subscriber's telephone line 31 into a corresponding digital signal when the extension digital trunk circuit 8 is connected to the subscriber's telephone line 31. An analog-to-digital converter (A/D converter) 85 converts the signal into a signal and sends it to the signal lines 21 and 22 via the selector 86. The analog-to-digital converter 85 is used for off-hook of the handset of a digital telephone, inputting a call request from the keyboard 117, etc. A call detection circuit 86 detects a call state such as a request to make a call, a call termination manually from the on-footer of the handset or the keyboard 117, etc.; A D/A converter 83 and an A/D converter 84 are interposed between the 4121.22 and the exchange processing unit 4, so that the extension digital telephone and the subscriber telephone line 31 can be connected, and the extension digital telephone and the ISDN It is a selector for directly connecting the signal line 21, 22 and the exchange processing unit 4 when the line 32 is connected.

The communication control operation of this embodiment with the above configuration is shown in FIG.
This will be explained below with reference to flowcharts A) to (C).

First, in step S1, the input/output device 14 determines which office line is I
Setting whether it is an SDN line or a subscriber telephone line, registering the extension number for the extension to which the analog telephone 13 is connected, and setting the calling party number that should be added when making a call from the analog telephone 13 to the ISDN line 32. Performs initial processing such as inputting initial setting information including additional information. These setting information are stored in the management table 5a of the memory 5.

Then, in steps S2 and S3, it is monitored whether there is an incoming call from the connection line or whether there is an outgoing call request from the extension terminal.

If there is an incoming call from the connected line and the subscriber telephone line trunk circuit 2 or ISDN trunk circuit 3 detects the incoming call or the incoming call, the process advances from step S2 to step S5, and the incoming call is detected from the ISDN line 32. It is checked whether it is detected by the ISDN trunk circuit 3 or not.

If the call is received from the ISDN line 32 and the ISDN trunk circuit 3 detects an "incoming call request", step S5
The process then proceeds to step S6, where it is checked whether the received call request frame j contains a ``calling subaddress'' as well as a ``calling number'' and a ``calling subaddress'' in accordance with the ISDN communication standard. If the "terminating subaddress" is not included, the process advances to step S7, and all connected telephones are notified that there is an incoming call request from the ISDN line 32.

At this time, digital telephone 1.1. ．． At the same time, additional information is output to 12, and the additional information is displayed on the display of the telephone. This additional information includes the "calling number", "calling address", etc. included in the "incoming call request" from the calling party.

Also, for the analog telephone 13, the ISDN ringer circuit 91 of the extension analog trunk circuit 9 is activated and the ISDN ringer circuit 91 is activated.
An ISDN ringer tone, which is an incoming call signal indicating ', which is an incoming call from the DN line 32, is output, and step S15
Proceed to.

On the other hand, if the received "incoming call request" includes the "terminating sub-address", the process advances from step S6 to step S8, and the one designated by the "incoming sub-address" is the analog telephone 13 or the digital telephone 11. Find out if it's 12. If the analog telephone 13 is not specified (if a digital telephone is specified), the process advances to step S9, and it is confirmed that there is an incoming call request from the ISDN line 32 only to the digital telephone specified by the "incoming subaddress". Notice. At this time, additional information is simultaneously output and displayed on the display of the designated digital telephone.

At this time, since the destination sub-address is specified,
No incoming signal is sent to other extension phones.

In addition, the input/output device interface circuit 1
0 to the input/output device 14 from the calling party.
Send additional information such as the "calling number" and "calling address j" included in the message.

Then, the process advances to step S15. As a result, input/output device 1
This additional information will be displayed on the display 4.

Note that the telephone designation based on the called party address is also displayed at the same time.

On the other hand, if it is determined in step S8 that the analog telephone 13 is designated by the "destination address", step S1
0, and in order to send an incoming signal only to the analog telephone 13, the ISDN ringer of the extension analog trunk circuit 9 is activated.
The circuit 91 is activated to send an ISDN ringer tone (incoming call signal) to notify that there is an incoming call request from the ISDN. At this time, since only the analog telephone is specified by the called sub-address, the call signal is not sent to other extension phones. Then, the process advances to step Sll.

With the above control, the person responding from the analog telephone can easily recognize that the call is coming from the ISDN line just by hearing the ringer tone.

In step Sll, it is checked whether additional information is included in the "incoming call request". If the additional information is not included, the process advances to step S15.

If the "incoming call request" includes additional information, the process proceeds to step SL2, where it is checked whether the analog telephone in question is equipped with a display device. Whether or not the analog telephone includes a display is specified in the initial processing of step S1. Note that in this embodiment, a display device is not provided, and the process proceeds to step S14.

However, if a telephone equipped with a display device is connected, the process advances to step S13, and the analog telephone 1
3, additional information such as the calling number j and calling address j included in the incoming call request from the caller is transmitted and displayed on the display of the telephone. Then, the process advances to step S15. In this case, for example, as a signal line with the analog telephone, a digital control signal line for controlling the display on the display unit is separately connected to the telephone, and the display data is sent to the display via the digital control signal line. This is done by sending out the .

In addition, when the switching processing unit 4 attempts to receive a call to the extension analog telephone 13 and the analog telephone 13 is in use, the control unit 1 connects the extension digital telephone (system exclusive) via the extension digital trunk circuit 8a. In addition to sending an incoming signal to the telephone (telephone) 11, the system also notifies the caller of the additional information sent by the caller and the fact that the call is being answered on behalf of the analog telephone 13, and the digital telephone 11 automatically sends a notification to that effect. It is desirable to display the information on the display of the telephone, notify the responder of the situation, and control the conversation so that it can start smoothly.

Further, at this time, the voice response processing unit 6 may also notify the caller that the caller will respond on his or her behalf. At this time, among the response messages registered in advance in the message registration section 6a of the voice response processing section 6, message information informing that a proxy will respond is selected and read out, and the exchange processing section 4, I
to the calling party via the SDN trunk circuit 3 (ISDN
Just send it to line 32).

On the other hand, if it is determined in step S12 that the analog telephone is not equipped with a display device, the process proceeds to step S14, and the "calling number" included in the received "call request" from the calling party is
, "Send additional information such as the address j to be issued to the input/output device 14 via the input/output device ink face circuit 10,
It is displayed on the display of the input/output device 14, etc. Then, proceed to steps 31 and 5.

In this embodiment, even if the destination of the call request from the ISDN line is an analog telephone, the additional information of the call request from the ISDN is displayed from the analog telephone as much as possible, and the analog telephone If the additional information cannot be displayed, the input/output device 14 can be used to display the additional information in the incoming call request. For this reason, since the ring tone from an analog telephone is a unique ring tone indicating that the call is from ISDN, ISD
By recognizing that the call is from N and checking the display on the input/output device 10 at this time, the additional information included in the call request to the analog telephone can be confirmed and an appropriate response can be taken. Note that this display may be a printout from a printer of the input/output device.

Then, in step S15, a response such as an off-hook of the handset of the connected extension telephone is waited for. If there is a response, the process advances to step S16, where it is checked whether the answering telephone is the analog telephone 13 or not. In the case of a response by the analog telephone 13, if the call detection circuit 95 of the extension analog trunk circuit 9 detects that the analog telephone 13 is off-hook, the process advances to step S17, and the voice response processing unit 6 is activated in the same manner as described above to perform ISDN communication. The caller is notified that the additional information notified by the caller has not reached the responder because the call was received by an analog telephone. This allows the conversation to start smoothly.

In addition, in the case of a system configuration in which additional information cannot be notified to the responder, a voice synthesis circuit (analog-digital conversion circuit) etc., converts the content of the additional information, which is a digital signal, into audio, which is an analog signal, and sends it to the analog telephone set.
Digital information such as the fact that the call has arrived from the DN and the content of additional information may be converted into corresponding voice information and directly notified to the responder.

Then, in the following step S18, the exchange processing unit 4 and the like are controlled to form a communication path between the incoming line and the answering telephone, and establish a call between the calling party and the answering party.

At this time, the cell 1/ctor 96 of the extension analog trunk circuit 9
A D/A converter 9 is connected between the extension and the exchange processor 4 by controlling the
3 and the A/D conversion section 94, the analog signal from the extension telephone is converted into a corresponding digital signal, and then sent to the ISD N +- rank circuit 3 via the exchange processing section 4.
and is sent to the ISDN line 32 and ISDN 300. On the other hand, the digital signal from the ISDN line 32 is converted into a corresponding analog signal and sent to the analog telephone set.

In the next step S19, the control unit 1 activates the billing processing unit 7 to start counting call charges, and also activates the input/output device 14.
control the display of call charges. Note that this billing process is performed only when communicating with the public line network 200, and the ISD
It may be controlled so that it is not performed when communicating with N300.

In the following step S20, the call detection circuit 95 checks whether to detect a disconnection request due to the end of the call or a disconnection request due to on-hook. If no disconnection request is detected and the call is to be continued, the process returns to step S19 and the display of call charges is updated.

If a disconnection request is detected and the call is terminated, the process advances to step S21, where the communication path between the two lines that were in use is disconnected, and both lines are restored. Then, the call history including the current call destination, call time, call charge, etc. is registered in the call extension telephone area of the call history table 5b in the memory 5, and the process is terminated and the process returns to step S2. Note that at this time, the input/output device 14
The display returns to the time display, etc. before the call arrived.

On the other hand, if it is a digital telephone that responds in step S16, the process advances to step S25, where the answering telephone and the
A communication path is formed with the SDN line 32. In this case,
Since both communications are based on digital signals, the selector 86 bypasses the A/D or D/A conversion section between the exchange processing section 4 and the extension line to establish a direct connection state. And step S2
In step 6, it is checked whether a disconnection request has been sent from the extension side or the ISDN line 32 side due to the end of the call. If a disconnection request is not sent, the call state is maintained, and if a disconnection request is sent, the process advances to step S21.

Further, in step S5, if the incoming call is not from the ISDN line 32 but from the subscriber's telephone line 31, the process advances to step S30. In step S30, all connected telephones are notified that there is a call from the subscriber's telephone line 31. At this time, digital telephone 11.12
The analog telephone 13 displays that the call is from the subscriber's telephone line 31 through the subscriber's line ringer circuit 92 of the extension analog trunk circuit 9. A subscriber line ringer tone is output to indicate that the Then, in step S31, a response is awaited, such as when the handset of the connected extension telephone goes off-hook. If there is a response, the process advances to step S32, where it is checked whether the answering telephone is the analog telephone 13 or not. If the call detection circuit 95 detects off-hook or the like in the case of a response by an analog telephone, the process proceeds to step 533 and controls the exchange processing section 4 to form a communication path between the subscriber telephone line 31 and the response analog telephone 13. . At this time, extension analog trunk circuit 9
D/A converter 93, A/D
The conversion section 94 is bypassed and the extension line and the exchange processing section 4 are directly connected. Then, in step S34, the billing processing unit 7 is started to start counting the call charge, and the input/output device 14 is controlled to display the call charge.

Next, in step S35, it is determined whether or not the call detection circuit 95 detects on-hook due to the end of the call or disconnection of the line. If there is no detection and the call continues, step S
The process returns to step 34 to update the call charges and display.

If the call ends and on-hook is detected, step S3
Proceed to step 6 and restore both lines that were in use. Then, the call history including the current call destination, call time, call charge, etc. is registered in the call extension telephone area of the call history table 5b in the memory 5, and the process is terminated and the process returns to step S2. At this time, the display on the input/output device 14 is returned to the time display before the call was received.

On the other hand, if it is a digital telephone that responds in step S32, the process advances to step S40, where the exchange processing section 4 is controlled to form a communication path between the answering telephone and the subscriber's telephone line 31. At this time, the selector 86 of the extension digital trunk circuit 8 is controlled to connect the D/A between the exchange processing unit 4 and the extension.
The conversion section 83 and the A/D conversion section 84 are used to convert the digital communication information from the responding digital extension telephone into corresponding analog communication information and send it to the subscriber telephone line 31. Analog-to-digital conversion processing or digital-to-analog conversion processing is performed to convert analog communication information into corresponding digital communication information and send it to a digital extension telephone. Then, proceed to step S34,
The billing processing unit 7 is activated and controlled to display the call charge on the input/output device 14. In this case, it is the digital phone that responds, and the call charge is displayed on the display of the input/output device 14 as well as on the display of the digital telephone.

Then, in step S35, it is monitored whether or not the subscriber's telephone line 31 is opened due to the end of the call, or there is a disconnection request from the telephone.

Furthermore, if there is a call request from the connected extension telephone in step S3, the process advances from step S3 to step S50, where it is checked whether the call request is to the ISDN line 32 or not.

To determine whether or not the request is to make a call to the ISDN line 32, control is performed to send control information specifying a predetermined call destination line, and it is determined from this control information which line to make the call.

The call is not made to the ISDN line 32, but to the subscriber telephone line 31.
If the call is to a subscriber, the process proceeds to step S51, where it is checked whether there is an idle line, that is, whether the subscriber's telephone line is busy. If there is no idle line and the line is busy, the process advances to step S52, where the call request type filler is notified of the busy state by a busy tone or a voice response from the voice response processing section 6, and the process returns to step S2.

If there is an idle line and it is not busy, the process advances to step S55 and the idle line is acquired. Then, in step S56, it is checked whether the call request is from the analog telephone 13 or not. If it is from the analog telephone 13, the process advances to step S57;
The exchange processing section 4 is controlled to form a communication path between the analog telephone connection line (signal line 23) and the acquired subscriber's telephone line.

At this time, the selector 96 of the extension analog trunk circuit 9 bypasses the D/A converter 93 and A/D converter 94 and directly connects the exchange processor 4 and the extension. Therefore, from now on, the destination telephone number signal from the analog telephone will be sent to the public telephone line network 20 connected to the subscriber's telephone line 31.
0 and the desired destination telephone will be called. Then, in the subsequent step S58, the input/output device 14 is set to a mode for displaying the call charge, and when the other party answers, the billing processing unit 7 is activated to count the call charge, and the billing counting result is displayed along with the calling telephone model, etc. Input/output device 14
Display from the display.

Then, in step S59, the call detection circuit 95 monitors whether or not the call has ended and the on-hook occurrence of one of the telephones has been detected. If the call has not ended, the process returns to step S58 to display and update billing.

When the call ends in step S59 and the call detection circuit 95 detects line disconnection such as an on-footer, the process proceeds to step S60, where both lines that were busy are released and restored. Then, the call history such as the current callee, call time, call charge, etc. is registered in the extension telephone area of the call history table 5b in the memory 5, and the process returns to step S2.

On the other hand, if it is determined in step S56 that the call requesting telephone is not the analog telephone 13 but a digital telephone, and the request is to make a call to a specific party, etc., step S56 is determined.
61, the call requesting telephone is notified of line capture. Then, in step S62, the subsequently sent destination telephone number data is converted into a corresponding telephone number signal and sent to the acquired subscriber's telephone line 31. In this case, the selector 86 of the extension digital trunk circuit 8 is controlled to connect the D/A converter 83 and the A/D converter 8 between the exchange processing unit 4 and the extension.
4. The process then proceeds to step S57. Note that the call charge is not displayed only on the display section of the input/output device 14 (
, and is also displayed on the display of the call requesting digital telephone to prompt the responder to shorten the call time.

In this way, when a call is made to the subscriber telephone line 31, the control section 1 causes the billing processing section 7 to immediately carry out billing processing when the other party answers, regardless of which extension telephone the call is made from. Start and monitor call charges based on the distance to the other party and the duration of the call. As the charges are added up, a signal is sent to each device via the exchange processing section 4 to update the display, and if the call is being made from a digital telephone 11 or 12, the display section and input/output device The charge is displayed on the display section 14, and when the call is made from the analog telephone 13, the charge is displayed on the display section of the input/output device 14.

Each device that has been notified of the call charges displays the current call charges in response to the display update signal and warns against long calls. And it will be displayed like this,
The monitored and calculated call charges are totaled and stored in the call history table 5b in the memory 5 in the extension telephone area where the call was made, as described above, after the call ends.

Thereby, when a call history reading command is issued from the input/output device 14, etc., the contents of the call history table 5b can be read and displayed, and at the same time, the call charges can also be displayed.

On the other hand, if the call request in step S50 is a request to the ISDN line 32, the process proceeds from step S50 to step S6.
Proceed to step 5 to check whether the ISDN line 32 has a vacant line. If there is no free line, the process proceeds to step 366, where a busy tone is output to the call requesting telephone, or a corresponding voice response is sent from the voice response processing unit 6 to notify that the ISDN line 32 cannot be captured. , return to step S2.

If it is determined in step 865 that the line is not busy and there is an idle line, the process advances to step S67 and the idle line is acquired.

Then, the call requesting telephone is notified of line capture.

This is true even if the voice response is from the voice response processing section 6 (
(in the case of an analog telephone, etc.), or by displaying it on the display of the call requesting telephone (in the case of a digital telephone, etc.) if possible. Then, in step 368, it is checked whether the call request is from the analog telephone 13 or not. The call request is from a digital telephone, and the analog telephone 13
If it is not, the process advances to step S69. In this case, the selector 86 of the extension digital trunk circuit 8 is controlled to bypass the D/A conversion section 83 and the A/D conversion section 84, and directly connect the exchange processing section 4 and the extension. The control unit 1 then receives the IS sent from the call requesting telephone.
Receives message information to be sent to the DN line 32, additional information such as calling party number, or its elements, edits this received information as necessary to generate a "call request command",
The process advances to step S72.

On the other hand, in step S68, the call request is sent to the analog telephone 13.
If the subscriber's telephone line 31 is in use, or if the request is for a call to a specific ISDN destination, the process advances to step S70, and the selector 96 of the extension analog trunk circuit 9 is controlled to select the extension. A D/A conversion section 93 and an A/D conversion section 94 are interposed between the exchange processing section 4 and the exchange processing section 4 . As a result, the digital signal sent from the ISDN line 32 via the exchange processing section 4 is converted into a corresponding analog signal and sent to the analog telephone, and the analog signal from the analog telephone is converted into a corresponding digital signal, and then It is sent to the ISDN (ISDN) rank circuit 3 via the exchange processing unit 4, and then sent to the INDN line 32 and I5DN 300.

Then, the calling party information is received in the form of a telephone number signal (such as a dial pulse signal or DTMF signal) successively sent from the analog telephone 13, is converted into a corresponding digital data signal, and is temporarily stored in a predetermined area of the memory 5. . Here, if no destination information is sent after a certain period of time, it is desirable to invalidate the call request, restore the line, and return to step S2.

Next, in step S71, a "call request command" is generated by editing the received destination number, etc., with additional information registered in advance in step S1. Then, the process advances to step S72. That is, when making an outside call via the ISDN line 32, data necessary for the additional information service that the ISDN supports (servo address information, etc.) is input/output in advance in step S1 or prior to making the call. It is sent from the device 14 to the control unit 1 via the input/output device interface circuit 10 and the exchange processing unit 4. The control unit 1 stores the sent data of the additional information service in a predetermined area of the memory 5, and the analog telephone 13 performs 1. When making a call to the SDN line 32, the additional information service data stored in the memory 5 is added to the "call request command."

In step S72, the "call request command" generated in this way is sent to the captured ISDN line 32,
In the following step S73, a response from the other party to the "call request command" is awaited. When a response from the other party is received, the process proceeds to step S74, where a communication path is formed between the call requesting telephone and the acquired line, and the communication is enabled.

Then, in the following step S75, the billing processing section 7 is started to start counting the call charges, and is controlled to display the call charges on the input/output device 14.

At this time, if the call request is from a digital telephone, the call charge is also displayed on the display of the telephone.

In the next step S76, it is determined whether or not the call detection circuit detects a disconnection request due to the end of the call, or the on-footer detects a disconnection request. If the call is to be continued, the process returns to step S75, and the display of the call fee is updated.

If a disconnection request due to the end of a call is detected, the process advances to step S77, where the communication path between the two lines that were in use is disconnected, and both lines are restored. Then, the call history such as the current callee, call time, call charge, etc. is registered in the extension telephone area of the call history table 5b in the memory 5, and the process returns to step S2. Note that at this time, the input/output device 14
The display returns to the time display, etc. before the call arrived.

As described above, according to this embodiment, both the analog telephone and the digital telephone can make calls to the ISDN line and the subscriber telephone line (public telephone network).

Furthermore, both analog and digital telephones have ISD
It is possible to respond to an incoming call (request for incoming call) from the N line or from the subscriber's telephone line (public telephone network).

[Effects of the Invention] As described above, according to the present invention, an incoming call from ISDN can be answered by an analog signal transmitting/receiving terminal device and a digital signal transmitting/receiving terminal device connected to an extension.

This makes it possible to connect and use conventional analog signal transmitting/receiving terminal equipment, making effective use of resources,
Furthermore, additional services of ISDN can be fully utilized.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention; Fig. 2 is a detailed block diagram of an extension digital telephone according to the embodiment; Fig. 3 is a partial detailed block diagram of an extension analog trunk circuit of the embodiment. FIG. 4 is a partially detailed block diagram of the extension digital trunk circuit of this embodiment, and FIGS. 5(A) to 5(C) are flowcharts showing call control processing of this embodiment. In the figure, 1...Control unit, 2...Subscriber telephone line trunk circuit, 3...SDN trunk circuit, 4...Switching processing unit, 5...Memory, 5a...Management table , 5
b...Call history table, 6...Voice response processing unit,
6a...Message registration unit, 7...Charging processing unit, 8
a, 8b... Extension digital trunk circuit, 9... Extension analog circuit, 10... Input/output device interface, 11° 12... Extension digital telephone, 13... Extension analog telephone, 14... Input/output device, 21.22
...Digital signal line, 31...Connection line to subscriber telephone line, 32...Connection line to ISDN, 83.93.
...Digital-to-analog converter (D/A converter), 84
゜94...Analog-digital converter (A/D converter), 85...Call detection circuit, 86.96...Selector, 91...I SDN ringer circuit, 92...
Ringer circuit for subscriber line, 95... call detection circuit,
100...Main device, 11]...DCPU, 112...
...DROM, 113...DRAM, 114...I
SDN interface, 115... Call circuit, 116
... Handset, 117 ... Keyboard, 118
...Keyboard control unit, 119...Display device, 120
. . . Display control unit, 200 . . . Public line network, 300.
...ISDN.

Claims (13)

[Claims] D
/A conversion means, A/D conversion means for converting analog communication information into corresponding digital communication information, and communication path control means for controlling the communication path between the ISDN connection line and the storage extension line. What is claimed is: 1. A telephone system capable of responding to an analog signal transmitting/receiving terminal device and a digital signal transmitting/receiving terminal device connected to an extension. (2) In the telephone system according to claim 1, the D/A conversion means and the A/D conversion means are energized only when the analog signal transmitting/receiving terminal device communicates with the ISDN, and the D/A
The conversion means converts the digital communication information from the ISDN into corresponding analog communication information, and the A/D conversion means converts the analog communication information from the analog signal transmitting/receiving terminal device into the corresponding digital communication information. A telephone system characterized in that an analog signal transmitting/receiving terminal device connected to an extension is capable of responding. (3) In the telephone system according to claim 1, further, when an incoming call request from ISDN is answered by an analog signal transmitting/receiving terminal device, the calling party is notified that the analog signal transmitting/receiving terminal device has responded. 1. A telephone system comprising a notification means for notifying a response analog signal transmitting/receiving terminal device that an incoming call is from an ISDN. (4) The notifying means further notifies additional service information based on ISDN to an extension connected to a digital signal transmitting/receiving terminal other than the responding terminal, and enables the connected extension to output and store the information. Telephone system as described in section. (5) The telephone system according to claim 1, further comprising: a collection means for collecting communication history; and a storage means for storing the communication history collected by the collection means. (6) The telephone system according to claim 1, further comprising means for outputting a call request to a connecting extension specified by at least additional service information provided by the ISDN when a call request is received from the ISDN. telephone system. (7) A telephone system that is connected to a public telephone line network and an ISND network and can accommodate analog signal transmission/reception terminal device connection extension lines and digital signal transmission/reception terminal device connection extension lines, which converts digital communication information into corresponding analog communication information. D to convert
/A conversion means, A/D conversion means for converting analog communication information into corresponding digital communication information, and call path control means for controlling the call path between the ISDN connection line and the storage extension line, A telephone system characterized in that an incoming call from ISDN can be answered by an analog signal transmitting/receiving terminal device and a digital signal transmitting/receiving terminal device connected to an extension line. (8) In the telephone system according to claim 7, when the analog signal transmitting/receiving terminal device communicates with the ISDN, the digital communication information from the ISDN is converted into corresponding analog communication information by a D/A conversion means, and the analog signal is transmitted/received. The analog communication information from the analog signal transmitting/receiving terminal device is converted into corresponding digital communication information by an A/D conversion means and sent to the ISDN, and when the digital signal transmitting/receiving terminal device communicates with the public telephone network, Analog communication information from the telephone line network is converted into corresponding digital communication information by an A/D conversion means and sent to the digital signal transmission/reception terminal device, and transmission/reception communication information from the digital signal transmission/reception terminal device is converted to corresponding digital communication information by the D/A conversion means. A telephone system characterized by converting into compatible analog communication information and sending it to the public telephone line network. (9) The telephone system according to claim 7, further comprising charging means for performing predetermined charging processing when an incoming call from a public telephone line is answered. (10) In the telephone system according to claim 7, further, when an analog signal transmitting/receiving terminal device responds to an incoming call request from ISDN, it notifies the calling party that the analog signal transmitting/receiving terminal device has responded. 1. A telephone system comprising a notification means for notifying a response analog signal transmitting/receiving terminal device that an incoming call is from an ISDN. (11) Claim 10, characterized in that the notifying means further notifies additional service information based on ISDN to an extension connected to a digital signal transmitting/receiving terminal other than the responding terminal, so that the connected extension can output and store the information. Telephone system as described in section. (12) The telephone system according to claim 7, further comprising: a collection means for collecting communication history; and a storage means for storing the communication history collected by the collection means. (13) The telephone system according to claim 7, further comprising means for outputting a call request to a connecting extension specified by at least additional service information provided by the ISDN when a call request is received from the ISDN. telephone system.