JP2809312B2 - Communications system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a communication system accommodating a digital external line and an analog internal line.

[Prior art] With the development of digital processing technology and communication technology,
There has been an increasing demand for direct digital communication between remote information processing devices, and ISDN has emerged as a communication network capable of digital communication.

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

For this reason, analog signal transmitting and receiving terminal devices (hereinafter referred to as “SL”), such as general public telephone line connection telephones, are widely used.
T ") cannot be connected to ISDN to receive data.

[Means for Solving the Problems] That is, an external line accommodating means for accommodating a digital external line, an extension accommodating means for accommodating a plurality of extensions including analog terminals,
When a digital outside line is connected to an analog terminal, an output unit that outputs additional information from the digital outside line is provided to an output terminal accommodated in the extension accommodation unit other than the analog terminal.

Alternatively, an external line accommodating means for accommodating a digital external line, an extension accommodating means for accommodating an analog internal line, and when connecting a digital external line and an analog internal line, outputting a voice corresponding to additional information from the digital external line to the analog internal line. And output means for performing the operation.

Further, an external line accommodating means for accommodating a digital external line, an extension accommodating means for accommodating an analog extension, a storage means for storing subaddress information corresponding to an analog extension, and a storage means for connecting a digital external line and an analog extension. Output means for outputting the sub address information stored in the digital external line to the digital external line.

Further, an external line accommodating means for accommodating a digital external line, an extension accommodating means for accommodating an analog extension, and, when an incoming call from a digital external line is connected to an analog extension, a message indicating that the incoming call has been connected to the analog extension. Output means for outputting to the digital outside line.

Furthermore, there is provided an external line accommodating means for accommodating digital and analog external lines, an analog extension accommodating means for accommodating an analog extension, and a digital extension accommodating means for accommodating a digital extension. When there is an incoming call, an incoming signal indicating an incoming call from an analog external line is output to an analog extension, and when there is an incoming call from a digital external line, an incoming signal indicating an incoming call from a digital external line is output to an analog internal line. Outputting additional information to a digital extension so that when an incoming call is received from an analog extension, it indicates that the incoming call is from an analog external line, and when there is an incoming call from a digital external line, additional information from the digital external line is displayed. It is characterized by.

[Operation] With the above configuration, when a digital external line is connected to an analog terminal, it is possible to output additional information from the digital external line to an output terminal accommodated in an extension accommodating means other than the analog terminal. it can.

Further, when a digital external line is connected to an analog extension, a sound corresponding to additional information from the digital external line can be output to the analog extension.

Further, when connecting a digital external line to an analog internal line, the sub-address information stored in the storage means can be output to the digital external line.

Furthermore, when an incoming call from a digital outside line is connected to an analog extension, a message indicating that the incoming call has been connected to the analog extension can be output to the digital outside line.

When an incoming call is received from an analog external line, an incoming signal indicating an incoming call from an analog external line is output to the analog extension when an incoming call is received from a digital external line. When an incoming call is received from a digital external line, the additional information can be output to the digital extension so as to display the additional information from the digital external line.

Hereinafter, an embodiment 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 which 11 to 14 are extension terminal devices connected to a main unit 100, and 31 is a connection to a subscriber telephone line. A connection line, 32 is a connection line to ISDN, 100 is a main unit, 200 is a public line network, and 300 is ISDN.

In the extension terminal devices, reference numerals 11 and 12 denote extension digital telephones, which are connected to the main device 100 via digital signal lines 21 and 22. 13 is an extension analog telephone, the main unit
100 is connected via an analog signal line 23. 14
Is connected to the main device 100 via the digital signal line 24,
The input / output device includes a display, a keyboard, and the like, and performs input / output of various types of information having a function as a system console of the present embodiment.

In this embodiment, for the sake of simplicity, the description will be made by taking as an example the case where the subscriber telephone line and the ISDN line are one line, and the extensions are four lines 21 to 24. However, the present embodiment is not limited to the above number of lines.

In the main device 100, reference numeral 1 denotes a control unit for controlling the whole of the present embodiment in accordance with, for example, programs shown in FIGS. 5A to 5C incorporated in the memory 5, and the control unit 1 is a known device.
It also performs communication control in accordance with the ISDN communication standard, and also establishes / opens a communication path in accordance with the standard for the subscriber telephone line (public line). Two are a subscriber telephone line trunk circuit that controls the interface with the subscriber telephone line 31, 3 is an ISDN trunk circuit that controls the interface with the ISDN line, and 4 is a connected subscriber telephone line 31, the ISDN line 32 and an extension terminal. An exchange processing unit 5 for controlling a communication path between devices is a memory for temporarily storing processing information and the like in the present embodiment, in addition to the above-mentioned programs, and is an attribute of each connection extension and is connected to the extension. It also includes a management table 5a in which the attributes and the like of the extension telephones are registered, a call history table 5b storing a call history for a certain period in the past for each extension telephone, and the like.

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

FIG. 2 shows a detailed block diagram of the extension digital telephone according to the present embodiment. In FIG. 2, a dedicated digital telephone 11 is shown.
As an example, the digital telephone 12 has substantially the same configuration.

In the figure, 111 is a DCPU that controls the entire digital telephone according to a program stored in a ROM 112, 112 is a DRAM that stores parameters and the like used in the present apparatus in addition to the programs described above, and 113 is a DRAM that stores transmission and reception data and the like. , 114 interface with the extension digital trunk circuit 8
ISDN interface (ISDN / I / F), 115 is ISDN / I / F114
The digital signal is converted to a corresponding analog signal and output from the handset 116 receiver.
A communication circuit for converting an analog signal from the transmitter of the transmitter into a corresponding digital signal and outputting 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 117 A keyboard control unit that controls input, 119 is a display, and 120 is a display control unit that controls display of the display 119.

FIG. 3 shows a block diagram of a part of the extension analog trunk circuit of this embodiment. FIG. 3 mainly shows a configuration peculiar to the present embodiment, and also does not show a part of a general extension analog trunk circuit configuration.

In FIG. 3, reference numeral 91 denotes an ISDN ringer circuit for outputting an ISDN ringer signal indicating that an incoming call request from the ISDN 300 is coming to the analog telephone, and 92 denotes a subscriber line network 200.
A ringer circuit for a subscriber line that outputs a ringer signal for a subscriber indicating that there is a called party, so that the ringer signal for the subscriber and the ringer signal for the ISDN can be easily distinguished. I have. Numeral 93 denotes a digital-analog converter for converting a digital signal from the ISDN line 32 to a corresponding analog signal when the extension analog trunk circuit 9 is connected to the ISDN line 32, and sending the analog signal to the signal line 23 via the selector 96. (D / A converter), 94 is an extension analog trunk circuit 9
Is connected to the ISDN line 32, an analog-to-digital converter (A / D converter) for converting an analog signal sent from the analog telephone via the selector 96 to a corresponding digital signal and sending it to the exchange processor 4. ), 95 is a call request by the off-hook of the handset of the analog telephone 13,
A call detection circuit for detecting a call state such as communication termination due to on-hook of a handset, etc.
When the ISDN line 32 is connected, a D / A conversion unit 93 and an A / D conversion unit 94 are interposed between the signal line 23 and the exchange processing unit 4 so that the extension analog telephone and the subscriber telephone line 31 are connected. When connected, it is a selector for directly connecting between the signal line 23 and the exchange processing unit 4.

FIG. 4 is a block diagram showing part of the details of the extension digital trunk circuit of this embodiment. FIG. 4 mainly shows a configuration peculiar to the present embodiment, and a part of a general extension digital trunk circuit configuration is not shown.

In FIG. 4, reference numeral 83 denotes a conversion processing unit which converts a digital signal sent from a digital telephone via a selector 86 to a corresponding analog signal when the extension digital trunk circuit 8 is connected to the subscriber's telephone line 31; A digital-analog conversion unit (D / A conversion unit) 84 for transmitting the analog signal from the subscriber telephone line 31 to the corresponding digital signal when the extension digital trunk circuit 8 is connected to the subscriber telephone line 31 The signal is converted to a signal, and the signal
An analog-to-digital converter (A / D converter) 85 for sending to the user, a call request from the digital telephone handset off-hook and a call request input from the keyboard 117, and a call from the handset on-hook and the keyboard 117 A call detecting circuit 86 for detecting a call state such as communication end due to an end input or the like; 86, signal lines 21 and 22 and an exchange processing unit 4 when the extension digital telephone and the subscriber telephone line 31 are connected;
A D / A conversion unit 83 and an A / D conversion unit 84 are interposed between the extension digital telephone and the subscriber telephone line 31 so as to be connectable.
When the extension digital telephone is connected to the ISDN line 32, the selector is a selector for directly connecting between the signal lines 21 and 22 and the exchange processing unit 4.

The communication control operation of the present embodiment having the above configuration will be described below with reference to the flowcharts of FIGS. 5 (A) to 5 (C).

First, in step S1, from the input / output device 14, which station line is ISDN
Line or subscriber telephone line setting, analog telephone
Initial processing such as registration of an extension number for the extension to which 13 is connected and input of initial setting information including additional information such as a caller number to be added when making a call from the analog telephone 13 to the ISDN line 32. Do. These setting information are stored in the management table 5a of the memory 5.

Then, in subsequent steps S2 and S3, it is monitored whether there is an incoming call (called) from the connection line or a calling (calling) request from the extension terminal.

If there is an incoming call from the connection line and the subscriber's telephone line trunk circuit 2 or ISDN trunk circuit 3 detects a called or incoming call, the process proceeds from step S2 to step S5, and the incoming call is detected from the ISDN line 32. It is checked whether or not the packet is detected (whether or not the ISDN trunk circuit 3 has detected it). ISDN line 32
From the ISDN trunk circuit 3
Is detected, the process proceeds from step S5 to step S6,
A check is made as to whether the "calling number" and "calling subaddress" in the "calling request frame" according to the received ISDN communication standard include the "calling subaddress". If the "sub-address" is not included, the flow advances to step S7 to notify all the connected telephones that there is an incoming call request from the ISDN line 32.

At this time, the additional information is output to the digital telephones 11 and 12 at the same time, and the additional information is displayed on the display of the telephone. This additional information includes a "calling number", a "calling sub-address", etc. included in the "calling request" from the calling party.

For the analog telephone 13, the ISDN ringer circuit 91 of the extension analog trunk circuit 9 is started to activate the ISDN line 32.
A ringer tone for ISDN, which is an incoming signal indicating that the call has been received from, is output, and the flow advances to step S15.

On the other hand, in the received “call request”,
Is included, the process proceeds from step S6 to step S8, and it is checked whether the analog telephone 13 or the digital telephones 11 and 12 are designated by the “destination subaddress”. If the analog telephone 13 is not specified (if a digital telephone is specified), the process proceeds to step S9, where only the digital telephone specified by the “Destination subaddress” has an ISDN line.
Notify that there is a call request more than 32. At this time, the additional information is output at the same time, and the additional information is displayed on the display of the designated digital telephone.

At this time, since the destination subaddress has been specified, no incoming signal is sent to other extension telephones.

Also, with it, I / O device interface circuit
The additional information such as the “calling number” and the “calling sub-address” included in the “call request” from the caller is transmitted to the input / output device 14 via 10. Then, the process proceeds to step S15. As a result, the additional information is displayed on the display of the input / output device 14. At the same time, the telephone designation by the destination subaddress is also displayed at the same time.

On the other hand, if it is determined in step S8 that the analog telephone 13 is specified by the “sub-address”, the process proceeds to step S10, and in order to transmit an incoming signal only to the analog telephone 13,
It activates the ISDN ringer circuit 91 of the extension analog trunk circuit 9 and sends an ISDN ringer sound (incoming signal) to notify that there is an incoming call request from ISDN. At this time, since only the analog telephone is specified by the destination subaddress,
No incoming signal is sent to other extension telephones. Then, the process proceeds to step S11.

With the above control, the responder from the analog telephone can
Just by listening to the ringer sound, you can easily recognize that the call is coming from the ISDN line.

In step S11, it is checked whether or not additional information is included in the "call request". If the additional information is not included, the process proceeds to step S15.

If additional information is included in the "call request", the flow advances to step S12 to check whether or not a display is attached to the analog telephone. Whether or not a display is included in the analog telephone is specified in the initial process of step S1. In this embodiment, no display is provided, and the process proceeds to step S14.

However, if a telephone equipped with a display is connected, the process proceeds to step S13, and the analog telephone 13 receives the "call number" and "call number" contained in the "call request" from the caller. The additional information such as "sub address" is transmitted and displayed on the display of the telephone. Then, the process proceeds to step S15. In this case, for example, as a signal line with an analog telephone, a digital control signal line for display control or the like in the display unit is separately connected to the telephone, and the display data is displayed on the display via the digital control signal line. For example.

Note that the control unit 1 sends the analog processing data to the extension
When 13 was busy, the extension digital trunk circuit
Extension digital telephone via 8a (system dedicated telephone)
In addition to sending an incoming signal to the telephone 11, the additional information sent by the caller and the fact that the call is a proxy response to the analog telephone 13 are notified. It is desirable to display on the display unit, notify the responder of the situation, and control so that the conversation can be started smoothly.

At this time, the voice response processing unit 6 may also notify the caller that the caller will respond. At this time, from among the response messages registered in advance in the message registration unit 6a of the voice response processing unit 6, message information for notifying that a response is to be made by proxy is selected and read out, and the exchange processing unit 4, IS
What is necessary is just to send it to the calling side (to the ISDN line 32) via the DN trunk circuit 3.

On the other hand, if the analog telephone is not provided with a display in step S12, the process proceeds to step S14, where the "calling number" included in the "call request" from the received caller,
The additional information such as “source subaddress” is transmitted to the input / output device 14 via the input / output device interface circuit 10 and displayed on the display of the input / output device 14. And step S15
Proceed to.

In the present embodiment, even when the destination of the incoming call request from the ISDN line is an analog telephone, the additional information during the incoming call request from the analog telephone is displayed from the analog telephone as much as possible. 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, it is possible to recognize that the incoming call is from ISDN rather than the unique ringing tone indicating that the ring tone from the analog telephone is an incoming call from ISDN. At this time, the display on the input / output device 10 is checked. Thereby, the additional information included in the incoming call request for the analog telephone can be confirmed, and appropriate measures can be taken. This display may be a printout from the printer of the input / output device.

Then, in step S15, a response by the off-hook or the like of the handset of the connected extension telephone is waited. If there is a response, step
Proceeding to S16, it is checked whether the answering telephone is the analog telephone 13. In the case of a response by the analog telephone 13, the call detection circuit 95 of the extension analog trunk circuit 9 is
When the off-hook 13 is detected, the process proceeds to step S17, in which the voice response processing unit 6 is activated in the same manner as described above, and the caller from ISDN is called by an analog telephone. Notify that the notified additional information does not reach the responder. Thereby, the conversation can be started smoothly.

In the case of such a system configuration in which the additional information cannot be notified to the responder, a voice synthesis circuit (analog-digital) for converting the content of the additional information into a voice signal is supplied to the voice response processing unit 6 or the extension analog trunk circuit 6. Conversion circuit)
The contents of the additional information, which is a digital signal, are converted into audio, which is an analog signal, and sent to an analog telephone.
Digital information such as an incoming call from the DN or the content of the additional information may be converted into corresponding voice information and directly notified to the responder.

Then, in the following step S18, the exchange processing section 4 and the like are controlled to form a communication path between the incoming line and the answering telephone, thereby establishing a call with the calling party. At this time, the selector 96 of the extension analog trunk circuit 9 is controlled so that the D / A conversion unit 93 and the A / D conversion unit 94 are interposed between the extension and the exchange processing unit 4, and the analog signal from the extension telephone is After being converted into a corresponding digital signal, the signal is transmitted to the ISDN trunk circuit 3 via the switching processing unit 4 and transmitted to the ISDN line 32 and the ISDN 300. On the other hand, a digital signal from the ISDN line 32 is converted into a corresponding analog signal and sent to an analog telephone.

In the next step S19, the control section 1 activates the accounting section 7 to start counting the call charges, and controls the input / output device 14 to display the call charges. It should be noted that the charging process may be controlled so as to be performed only when communicating with the public line network 200 and not performed when communicating with the ISDN 300.

In the next step S20, it is checked whether the call detection circuit 95 detects a disconnection request due to the end of the call or a disconnection request due to on-hook. When the disconnection request is not detected and the telephone call is continued, the process returns to step S19 to update the display of the telephone charge.

When the disconnection request is detected and the call is terminated, the process proceeds to step S21, where the communication path between the two lines during the call is disconnected, and both lines are restored. And the call history table in the memory 5
The call destination such as the current call destination, the call time, and the call charge are registered in the extension telephone area where the call was made in step 5b, the processing is completed, and the process returns to step S2. At this time, the display of the input / output device 14 is returned to the timetable before receiving the call.

On the other hand, if the digital telephone responded in step S16, the process proceeds to step S25, where the answering telephone and the ISDN
A communication path is formed with the line 32. In this case, since both of the communications are digital signals, the selector 86 bypasses the A / D or D / A conversion unit between the exchange processing unit 4 and the extension to establish a direct connection state. Then, in step S26, it is checked whether a disconnection request has been sent from the extension side or the ISDN line 32 due to the end of the call. If the disconnection request has not been sent, the communication state is maintained, and if the disconnection request has been sent, the process proceeds to step S21.

Further, in step S5, if the incoming call is not from the ISDN line 32 but an incoming call from the subscriber telephone line 31, the process proceeds to step S30. In step S30, all connected telephones are notified that there is a call from the subscriber telephone line 31. At this time, the subscriber telephone line 3 is connected to the digital telephones 11 and 12.
Indicate that the call was received from 1
The subscriber line ringer circuit 92 of the extension analog trunk circuit 9 outputs a subscriber line ringer sound indicating that a call is being received from the subscriber telephone line 31. Then, in step S31, a response by the off-hook of the handset of the connected extension telephone is waited. If there is a response, the flow advances to step S32 to check whether or not the answering telephone is the analog telephone 13. If the call detection circuit 95 detects off-hook or the like in the case of a response by the analog telephone, the process proceeds to step S33, and the exchange processing unit 4
To form a communication path between the subscriber telephone line 31 and the answering analog telephone 13. At this time, at the same time, the selector 96 of the extension analog trunk circuit 9 is controlled so that the D / A exchange section 93 and the A / D
The conversion unit 94 is bypassed, and the extension and the exchange processing unit 4 are directly connected. Then, in the subsequent step S34, the accounting processing section 7 is activated to start counting the call charges, and the input / output device 14 is controlled to display the call charges.

Next, in step S35, it is checked whether or not the on-hook or the line disconnection due to the end of the call is detected by the call detection circuit 95. To continue the call without detection, go to step S34
To update the call charge and display.

If the call is terminated and on-hook is detected, step S3
Proceed to step 6 to restore both lines during the call. Then, the call history of the current call destination, the call time, the call charge, and the like are registered in the extension telephone area of the call in 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 of the input / output device 14 is returned to the time display before the incoming call or the like.

On the other hand, if the answer in step S32 is a digital telephone, the flow advances to step S40 to control the exchange processing unit 4 to form a communication path between the answer telephone and the subscriber telephone line 31. At this time, the selector 86 of the extension digital trunk circuit 8 is controlled so that the D / A conversion section 8 is connected between the exchange processing section 4 and the extension.
3 and the A / D converter 84, and converts the digital communication information from the responding digital extension telephone into corresponding analog communication information and sends it to the subscriber telephone line 31, and the analog communication from the subscriber telephone line 31 An analog-to-digital conversion process or a digital-to-analog conversion process in which information is converted into corresponding digital communication information and sent to a digital extension telephone is performed. Then, the process proceeds to step S34, in which the charging processing section 7 is started, and the input / output device 14 is controlled to display the call charge.
In this case, the digital telephone responded, and the display of the call charge is performed together with the display of the input / output device 14 on the display of the digital telephone.

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

Further, if there is a call request from the connected extension telephone at step S3, the process proceeds from step S3 to step S50 to check whether or not the call request is for the ISDN line 32. ISDN line
Whether or not the call is to be made to the call 32 may be controlled by sending control information for specifying a predetermined call destination line, and it may be determined which line to call based on the control information.

If the call is not to the ISDN line 32 but to the subscriber telephone line 31, the process proceeds to step S51 to determine whether or not there is an empty line, that is, whether or not the subscriber telephone line is busy. Find out. If there is no idle line and the telephone is busy, the flow advances to step S52 to notify the call request telephone that the telephone is busy with a busy tone or a voice response from the voice response processing unit 6, and the flow returns to step S2.

If there is an empty line and the line is not busy, the process proceeds to step S55 to capture the empty line. Then, in step S56, it is checked whether or not the call request is from the analog telephone 13. If it is from the analog telephone 13, proceed to step S57 to control the exchange processing unit 4 to control the analog telephone connection line (signal line 23).
And the subscriber's telephone line. At this time,
The selector 96 of the extension analog trunk circuit 9 bypasses the D / A converter 93 and the A / D converter 94, and
And the extension directly. For this reason, the other party's telephone number signal from the analog telephone is thereafter transmitted to the subscriber telephone line 31.
Is sent to the public telephone network 200 connected to the telephone, and a desired partner telephone is called. Then, in the next step S58, the input / output device 14 is set to the mode for displaying the call charge, and when the other party answers, the charging processing unit 7 is started to count the call charge, and the charge count result is displayed together with the calling telephone type and the like. Is displayed on the display of the input / output device 14.

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

When the call ends in step S59 and the call detection circuit 95 detects a line disconnection such as on-hook or the like, the process proceeds to step S60, in which both lines that were busy are released and restored. And memory 5
The current call destination, the call time such as the call time, the call charge, etc. are registered in the extension telephone area of the call in the call history table 5b, and the process returns to step S2.

On the other hand, in step S56, the calling request telephone is not the analog telephone 13 but a digital telephone calling request,
When a call request to a specific party is made, step S61
To notify the call request telephone of the line seizure. Then, in step S62, the destination telephone number data transmitted subsequently is converted into a corresponding telephone number signal and transmitted to the captured subscriber telephone line 31. In this case, the selector 86 of the extension digital trunk circuit 8 is controlled so that the D / A converter 83 and the A / D converter 84 are interposed between the exchange processor 4 and the extension.
Then, the process proceeds to step S57. The display of the call charge is displayed not only on the display unit of the input / output device 14 but also on the display unit of the call request digital telephone, and control is performed to prompt the respondent to shorten the call time.

As described above, when a call is made to the subscriber's telephone line 31, the billing process is performed by the billing processor 7 as soon as the other party answers, regardless of which extension telephone is called. Start and monitor call rates from distance and call duration. As the charge is added, a signal for updating the display is sent to each device via the exchange processing unit 4, and when a call is made from the digital telephones 11, 12, the display unit and the input / output device The charge is displayed on the display unit 14, and when a call is made from the analog telephone 13, the charge is displayed on the display unit of the input / output device 14.

Each device notified of the call charge displays the call charge up to the present according to the signal for updating the display,
Call attention to long phone calls. Then, the call charges displayed, monitored and calculated in this manner are totaled after the end of the call as described above, and stored in the extension telephone area of the call in the call history table 5b in the memory 5.

Thus, when a call history read command is issued from the input / output device 14 or the like, the contents of the call history table 5b can be read and displayed, and at the same time, the call charge can be displayed together.

On the other hand, if the call request is a request for the ISDN line 32 in step S50, the process proceeds from step S50 to step S65,
It checks whether there is a free line in the ISDN line 32. If there is no idle line, the process proceeds to step S66, in which a busy tone is output to the calling request telephone or a corresponding voice response is transmitted from the voice response processing unit 6 to notify that the ISDN line 32 cannot be captured. Return to step S2.

If it is not busy at step S65 and there is an empty line, the process proceeds to step S67 to capture the empty line. Then, the call requesting telephone is notified of the line capture. This is done by displaying the call requesting telephone on the display unit (such as a digital telephone) if possible, even if it is a voice response from the voice response processing unit 6 (such as an analog telephone). Is also good.
Then, in step S68, it is checked whether or not the call request is from the analog telephone 13. If the call request is from the digital telephone and not from the analog telephone 13, the process proceeds to step S69. In this case, the selector 86 of the extension digital trunk circuit 8 is controlled to bypass the D / A conversion unit 83 and the A / D conversion unit 84, so that the exchange processing unit 4 and the extension are directly connected. The control unit 1 receives message information sent to the ISDN line 32, additional information such as a caller number, and the like, or elements thereof, which are subsequently sent from the call requesting telephone set, and transmits the received information as necessary. By editing, a "call request command" is generated, and the flow advances to step S72.

On the other hand, if the call request is from the analog telephone 13 in step S68, and if the subscriber's telephone line 31 is in use or a call request to a specific ISDN connection partner, the process proceeds to step S70, where the extension analog By controlling the selector 96 of the trunk circuit 9, a D / A converter 93 and an A / D converter 94 are interposed between the extension and the exchange processor 4. As a result, the digital signal sent from the ISDN line 32 via the switching unit 4 is converted into a corresponding analog signal and sent to an analog telephone, and the analog signal from the analog telephone is converted into a corresponding digital signal. ISDN via exchange unit 4
The data is sent to the trunk circuit 3 and sent to the INDN line 32 and the ISDN 300. Then, the telephone number signal (dial pulse signal or DTMF
Signal, etc., is received, converted into a corresponding digital data signal, and 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 perform control to invalidate the call request, restore the line, and return to step S2.

Next, the call origination request command is generated by editing the additional information and the like registered in advance in step S1 to the destination number and the like received in step S71. Then, the process proceeds to step S72. That is, when an outgoing call is made via the ISDN line 32, the data (subaddress information, etc.) necessary for the additional information service supported by ISDN is stored in advance in step S1 or in the input / output device prior to the call. From 14, the data is sent 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 transmitted data of the additional information service in a predetermined area of the memory 5, and stores the additional information service stored in the memory 5 when the analog telephone 13 calls the ISDN line 32. 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, and in step S73, a response from the other party to the "call request command" is waited for. When receiving a response from the other party, step S74
Then, a call path is formed between the call request telephone and the capture line, and a call is made possible.

Then, in the following step S75, the accounting processing section 7 is activated to start counting the call charges, and to control the display of 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 unit of the telephone.

In the next step S76, it is checked whether or not there is a disconnection request detected by the call detection circuit due to the termination of the telephone call or a disconnection request detected by the on-hook. If the call is to be continued, the flow returns to step S75 to update the display of the call charge.

If a disconnection request is detected due to the end of the call, the flow advances to step S77 to disconnect the communication path between the two lines during the call and restore the two lines. Then, the call destination such as the current call partner, the call time, and the call charge is registered in the extension telephone area of the call in the call history table 5b in the memory 5, and the process returns to step S2. At this time, the display of the input / output device 14 is returned to the timetable before receiving the call.

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

Furthermore, both analog and digital telephones are ISDN
It is possible to respond to a called (incoming request) from a line or a subscriber's telephone line (public telephone network).

[Effects of the Invention] As described above, according to the present invention, when a digital outside line is connected to an analog terminal, additional information from the digital outside line is output to an output terminal accommodated in extension accommodation means other than the analog terminal. By outputting, even if the additional information from the outside line can not be displayed on the analog terminal, the user of the analog terminal, by referring to the output terminal accommodated in the extension accommodation means other than the analog terminal,
Additional information from the digital outside line can be obtained.

Further, when connecting a digital external line and an analog extension, by outputting a voice corresponding to the additional information from the digital external line to the analog extension, the additional information from the external line cannot be displayed on the analog terminal. Also, the user of the analog terminal can obtain additional information from the digital outside line by voice.

Further, when connecting a digital external line to an analog extension, by outputting the sub-address information stored in the storage means to the digital external line, the sub-address information corresponding to the analog extension having no function of outputting the sub-address information is converted to the digital external line. Can be notified to the other party to be connected via.

Further, when an incoming call from a digital external line is connected to an analog extension, a message indicating that the incoming call has been connected to the analog external line is connected to the digital external line, so that the other party connected via the digital external line can receive an analog signal. It is possible to notify that the connection has been made to the extension and make the other party perform appropriate communication.

When an incoming call is received from an analog external line, an incoming signal indicating an incoming call from an analog external line is output to the analog extension when an incoming call is received from a digital external line. By displaying additional information to a digital extension so as to indicate that an incoming call has been received from an analog external line, and to display additional information from the digital external line when an incoming call has been received from a digital external line, the extension can be output to either of the external lines. An appropriate response can be made depending on whether the call is incoming.

[Brief description of the drawings]

1 is a block diagram of an embodiment of the present invention, FIG. 2 is a detailed block diagram of an extension digital telephone of the embodiment, and FIG. 3 is a block diagram of a part of an extension analog trunk circuit of the embodiment. FIG. 4 is a block diagram showing part of the details of the extension digital trunk circuit of this embodiment, and FIGS. 5A to 5C are flow charts showing a call control process of this embodiment. In the figure, 1... Control unit, 2... Subscriber telephone line trunk circuit, 3... ISDN trunk circuit, 4.
... Memory, 5a ... Management table, 5b ... Call history table, 6 ... Voice response processing unit, 6a ... Message registration unit,
7 Billing processing unit, 8a, 8b Extension digital trunk circuit, 9 Extension analog circuit, 10 I / O device interface, 11, 12 Extension digital telephone, 13 Extension analog telephone, 14 ... I / O device, 21,22 ... Digital signal line, 31 ... Connection line to subscriber telephone line, 32 ... IS
Connection line to DN, 83,93 ... Digital-analog converter (D
/ A converter), 84,94 …… Analog-digital converter (A / D
Conversion unit), 85: Call detection circuit, 86, 96: Selector, 9
1 ... Ringer circuit for ISDN, 92 ... Ringer circuit for subscriber line, 95 ... Call detection circuit, 100 ... Main unit, 111 ...
DCPU, 112… DROM, 113… DRAM, 114… ISDN interface, 115… Communication circuit, 116… Handset, 11
7 ... Keyboard, 118 ... Keyboard controller, 119 ...
Display 120, Display control unit 200 Public network 300
... ISDN.

Claims (5)

(57) [Claims] 1. An external line accommodating means for accommodating a digital external line, an extension accommodating means for accommodating a plurality of extensions including an analog terminal, and when connecting a digital external line and an analog terminal, the extension accommodating means other than the analog terminal Output means for outputting additional information from the digital outside line to an output terminal accommodated in the communication system. 2. An external line accommodating means for accommodating a digital external line, an extension accommodating means for accommodating an analog internal line, and when connecting a digital external line and an analog internal line, a sound corresponding to additional information from the digital external line is output to the analog external line. An output means for outputting to an extension. 3. An external line accommodating means for accommodating a digital extension, an extension accommodating means for accommodating an analog extension, a storage means for storing subaddress information corresponding to the analog extension, Output means for outputting the sub-address information stored in said storage means to said digital external line. 4. An external line accommodating means for accommodating a digital external line, an extension accommodating means for accommodating an analog internal line, and when an incoming call from a digital external line is connected to the analog internal line, the incoming call is connected to the analog internal line. Output means for outputting a message to the digital outside line. 5. An external line accommodating means for accommodating a digital extension and an analog external line, an analog extension accommodating means for accommodating an analog extension, and a digital extension accommodating means for accommodating a digital extension. When an incoming call is received from an analog external line, an incoming signal indicating an incoming call from the analog external line is output to the analog extension, and when an incoming call is received from the digital external line, an incoming signal indicating an incoming call from the digital external line is output to the analog extension. The means outputs the additional information to the digital extension so that when there is an incoming call from the analog extension, it indicates that the incoming call is from the analog external line, and when there is an incoming call from the digital external line, the additional information from the digital outside line is displayed. A communication system, comprising: