JPH0549067A - Communication equipment - Google Patents

Abstract

PURPOSE:To avoid a disadvantage due to collision between an incoming call and an outgoing call by retrieving other free analog line and making a dialing form the line when an incoming call to the free analog analog line is detected. CONSTITUTION:When a handset of a telephone set 71 is hooked off, a control section 12 discriminates an automatic free outside-line outgoing data of a preset system operation data in a memory 14. When the extension telephone set hooked off corresponds to a number indicated in the automatic free outside-line outgoing data, busy extension and outside line numbers among plural external lines 61-63 are discriminated to select a free outside line. The control section 12 checks the collision of outgoing and incoming calls of the selected outside line and when collision between the outgoing and incoming calls takes place, other free outside line is automatically supplemented. Then through the other outerside line, automatic dialing is made when collision between the outgoing and incoming calls of the outside line takes place. Thus, the disadvantage due to the collision between the outgoing and incoming calls is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device which accommodates a plurality of lines and a plurality of terminal devices and is capable of making a call to and answering an incoming call to any other party via the lines. Is.

[0002]

2. Description of the Related Art In a conventional communication device, for example, a telephone exchange system, an outside line to be transmitted from an extension telephone to an outside line may be manually picked up or an outside line may be automatically selected. That is, when the operator presses the outside line key on the telephone, the specified outside line is sent from the specified outside line, or automatically by dialing with "0" added in front of the destination telephone number. There are "0" special number transmission to select an outside line and make a call, and an automatic outside line transmission system to automatically select and send an outside line by off-hooking the handset of the telephone. In both manual and automatic outgoing calls, if outgoing calls and outgoing calls overlap,
When a so-called outgoing / incoming call collision occurs, the incoming call is prioritized for the response operation.

Further, in a button telephone device capable of accommodating a plurality of outside lines and a plurality of extensions, the outside line button of the extension telephone and the channel of the outside line are fixedly associated with each other. For example, the outside line button 1 is an ISDN ( The B1 channel of the integrated service communication network) and the outside line button 2 are configured to correspond to the B2 channel, respectively.

[0004]

Therefore, there is a problem that when a call origination / termination collision occurs, the call is answered regardless of the operator's intention to make a call.

For example, an operator may make a telephone call with an unexpected partner, which may cause discomfort to the partner due to a mistake or the like.

Further, there is a problem in that the operation becomes complicated because it is necessary to make a redial call to the other party who tried to make a call again after making a response once.

However, in the above-mentioned conventional button telephone device, if an incoming call designating the B1 channel is made from the outside line while the dial line is being input to make a call using the outside line button 1, the call cannot be made. There are drawbacks. In other words, when trying to make a call, the dial number is entered with the numeric keypad, and the dial signal is sent after the start key is pressed. There is a problem of being interrupted.

[0008]

1 is a schematic block diagram of a telephone exchange system according to an embodiment of the present invention. In the figure, 11 is a telephone exchange device, 12 is a control unit that controls the entire telephone exchange device 11 including transmission control at the time of a call origination / termination collision which will be described later, and 13 is an outside line 61 to 11 when a call path is connected or disconnected. 63 is a call path switch that forms a call path between the extension telephones 71 to 73 connected to the extension telephone interface 63.

Reference numeral 14 is a memory section for storing system setting data, shortened data for each telephone, one-touch dial data, etc., 15 is a sound source section for generating dial tone, multi-frequency calling signal, ringing sound, etc., and 16 is not shown. Is an external line interface that manages an interface with external lines 61 to 63 connected to the public telephone network or the like, and 17 is an internal line interface that manages an interface with the extension telephones 71 to 73 housed in the device.

FIG. 2 is a detailed block diagram of one of the plurality of outside line circuits included in the outside line interface 16 of FIG. L ₁ and L ₂ are input / output terminals of an external line circuit connected to the public telephone network, and 21 is a polarity detection / calling for detecting the polarity of the telephone line, that is, the polarities of L ₁ and L ₂ and the ringing signal from the telephone line. This is a signal detection circuit, and a detection signal is output to the control unit 12 via SEN1.

Ar1 is a contact point of the relay AR1 and CO
It is turned on / off under the control of the control unit 12 via NT1. VZ is a varistor that protects the circuit from an external surge voltage, BG is a diode bridge circuit, T1 is a transformer that performs 2/4 wire conversion for telephone lines L ₁ and L ₂ , BN is a balancing network circuit for impedance matching, AMPs 1 and 2 are amplifier circuits that amplify audio signals. Further, 22 is a voice codec for A / D and D / A (analog / digital, digital / analog) conversion of analog signals and digital signals, and 23 is a DC loop opening / closing forming a DC loop of telephone lines L ₁ and L _2. A circuit, which is controlled by the control unit 12 via the CONT2 to generate a dial pulse and opens and closes the DC loop.

The operation of the control unit 12 at the time of making an outside line in the telephone exchange apparatus according to this embodiment having the above configuration will be described below with reference to the flowchart of FIG.

The control unit 12 discriminates off-hook in step S1, and when the handset of the telephone set 71 is off-hook, the control unit 12 in step S2 sets the automatic external line transmission data of the system operation data preset in the memory 14. To determine. If the extension telephone set off-hook corresponds to the automatic outside line transmission data, the process proceeds to step S3. Otherwise, the process proceeds to step S11. In step S3, it is determined by referring to the memory unit 14 whether or not the external line having the largest internal / external line number of the external lines 61 to 63 is in use, and the external line that is not in use is selected.

Next, in step S4, the control section 12 determines whether or not the polarity inversion of the telephone lines L ₁ and L ₂ or the ringing signal is detected by the SEN1 and the polarity detection / ringing signal detection circuit 21 of FIG. Make a decision. Specifically, the polarities of the telephone lines L ₁ and L ₂ at the time of starting up the telephone exchange system are stored in advance in the memory unit 14 via the polarity detection circuit 21 and SEN1, and the stored data and the polarity detection are performed. Circuit 2
The result of detection in 1 is compared to determine whether or not the polarity is reversed. Further, the ringing signal is detected by determining whether or not SEN1 changes corresponding to the ringing signal frequency of 16 Hz. When the polarity inversion or the ringing signal is detected, this state is the state where the incoming and outgoing call collision has occurred, and the process proceeds to step S5. However, if the polarity inversion or the ringing signal is not detected, the process proceeds to step S6.

In step S5, the control unit 12 controls the memory unit 1
The state of the external line of No. 4 is set to be in use, and a ringing tone is sent from the sound source unit 15 to the extension telephones other than the extension telephone (telephone 71) in use through the speech path switch and the extension interface 17. , Incoming call processing such as displaying the corresponding outside line lamp of all extension telephones as an incoming call. After that, the process returns to step S3, an outside line other than the one in use is selected, and the process proceeds to step S4 again to judge whether or not there is an outgoing / incoming call collision.

If it is not an outgoing / incoming collision, the process proceeds to step S6, the relay AR1 is activated via the CONT1 of the outside line interface 16 to turn on the relay contact,
The telephone line is captured by forming the DC loop of the telephone line by the DC loop opening / closing circuit 23. Next, in step S7, the control unit 12 sets the state of the external line in the memory unit 14 to "in use" and controls the call path switch 13 to connect the extension telephone set 71 and the external line.
As a result, the telephone 71 hears a dial tone from the public telephone line. Further, the control unit 12 indicates that the corresponding outside line lamps of all extension telephones are in use.

Next, in step S8, the dial data from the extension telephone 71 is awaited. Upon receiving the dial data, the control unit 12 activates the sound source unit 15 based on the received dial data in step S9 and generates a multi-frequency calling signal as a selection signal. Then, the call path switch 13 is switched and connected, the call signal is sent to the extension telephone 71, and the CONT2 and the DC loop opening / closing circuit 23 are controlled based on the received dial data, and the DC for the telephone lines L ₁ and L ₂ is controlled. After forming the loop, a selection signal is sent to the telephone lines L ₁ and L ₂ . Thereafter, the process proceeds to step S10, and normal transmission processing such as response detection and call path connection is performed.

On the other hand, if it is determined in step S2 that the transmission is not an automatic outside line transmission, the process proceeds to step S11. That is, in step S11, the speech path switch 13 from the sound source unit 15,
A dial tone is sent to the telephone set 71 via the extension interface 17. Next, in steps S12 and S13, outside line button data or dial data is waited for. Control unit 1
When the external line button data 2 is received, the process proceeds to step S16 to drive the external line interface 16 specified by the external line button data in the same manner as in step S6 to capture the specified external line and use the state of the external line in the memory unit 14. Set inside. Then, the corresponding outside line lamps of all extension telephones are displayed as being in use. Next, in step S17, the call path switch 13 is controlled to connect the call path to the outside line and the extension line. Next, in step S8, the same operation as described above is performed.

When the dial data is received in step S13, it is determined in next step S14 whether or not the received data is a "0" special number. As a result, when the dial data of "0" special number is received, the process proceeds to step S3, and the same operation as described above is performed. On the other hand, if the special number is other than "0", the process proceeds to step S15 to perform extension calling processing.

As described above, according to the present embodiment, when an outside line is automatically selected when a call is made to an outside line, a call origination / termination collision is determined before the outside line is captured. When a call origination / termination collision occurs, an incoming call processing such as sending a ringing signal to an extension telephone other than the one in use is performed, and another outside line is automatically selected again to capture the outside line. It is possible to automatically make a call from an outside line other than the outside line where the incoming call collision has occurred.

Further, according to the present embodiment, even when an incoming / outgoing call collision occurs, by calling an extension other than the extension whose external line is selected, the incoming call can be normally answered by the extension.

In other words, when an outside line is selected to make a call, even if an outgoing / incoming collision occurs on the selected outside line, the outside line can be selected again to make a call, and the operator tries to make a call. No more answering an incoming call regardless of the intention to do so, and no more giving an unpleasant feeling to the other party by making a call with the other party. Further, it is possible to provide an excellent telephone exchange device in which it is not necessary to make a redial call to the other party after making a response once, and the operation at the time of making a call becomes simple.

FIG. 4 is a block diagram of a button telephone device according to a second embodiment of the present invention. In FIG. 4, 1 is a main device of the button telephone device, 2 is a control unit for controlling the entire device, and 3 is a controller.
Is a memory for storing the states of external lines and internal lines, 4 is a speech network for connecting internal lines to external lines, and mutual communication paths for internal lines, 5 is an external line interface for transmitting and receiving call control information to and from ISDN (Complex Service Digital Network), and 6 is ISD
It is an outside line connected to N. 6B1, 6B2, 6D
Is an external line 6 logically divided and represented by B
It supports 1 channel, B2 channel, and D channel. Further, 7 is an extension interface for communicating with a telephone, 8 is a telephone, 9 is a handset, and 10 and 11 are outside line buttons, and two buttons are assigned corresponding to one outside line (for outside line 6, 10-1 and 10-2).
Further, 12 is a dial button, and 13 is a start button for instructing the end of dial input.

5 and 6 are flow charts showing the operation of the control unit 2 of the apparatus according to this embodiment. FIG. 5 shows the operation at the time of making a call and FIG. 6 shows the operation at the time of receiving a call.

The operation at the time of calling and receiving will be described below with reference to these flowcharts.

In FIG. 5, the control unit 2 first monitors the pressing of the outside line button 10 (steps S201 and S20).
2) If the outside line button 10-1 is pressed, the memory 3
Set the usage status of the outside line button 10-1 of
The lamp of the outside line button 10-1 of each telephone is turned on (step S204). If the outside line button 10-2 is pressed, the use state of the outside line button 10-2 in the memory 3 is set to "in use", and the lamp of the outside line button 10-2 of each telephone is turned on (step S203).

Next, the dial input is monitored, and the dial is stored in the memory 3 until the start button 13 is pressed (step S205).

When the pressing of the start button 13 is detected (step S206), the usage state of the channel corresponding to the outside line 6 of the memory 3 is determined (steps S207, S20).
8) The use status of the vacant channel is set to "in use" (steps S209 and S210), the external line interface 5 is activated, and the calling process is performed based on the dial input to the corresponding channel (step S21).
1).

On the other hand, in FIG. 6, the control unit 2 monitors an incoming call from the external line 6 via the external line interface 5 (steps S301 and S302), and if there is an incoming call, the channel corresponding to the incoming call in the memory 3 is received. The use state of is set to "in use" (steps S303 and S304).

The control unit 2 then selects the outside line button 1 of the memory 3.
The usage state of 0 is determined (steps S305 and S30).
6). Then, the use state of the vacant outside line button is set to "in use", the lamp of the corresponding outside line button is blinked (steps S309 and S310), and the incoming call process is performed for each telephone (step S311).

On the other hand, when the outside line button is full, the control unit 3 returns the use state of the channel instructed to receive the call in the memory 3 to empty (step S307), activates the outside line interface, and rejects the incoming call. (Step S30
8).

The control unit 2 controls each extension telephone so that the lamps of the extension telephones have the same lighting state.

Further, when the call ends, the control unit 2 sets the use state of the outside line button and the channel corresponding to the ended call to be empty, and turns off the lamp of the outside line button.

In this embodiment, one external line is used.
Although two outside line buttons are assigned to each other, this limitation may be eliminated, and all the outside lines accommodated in the apparatus and all outside line buttons may be freely searched for and associated with each other.

In the present embodiment, the lamp is turned on and blinks in response to the push of the outside line button, but the liquid crystal display may display the channel state instead of the lamp. Further, these may be realized by using a touch panel, or the outside line button may also be used as a ten key.

In this embodiment, the key telephone device which accommodates the ISDN has been described, but the present invention can be applied to the key telephone device which can accommodate the analog line.
For example, when two ISDN lines and two analog network lines are accommodated in the device, the four external line buttons for ISDN and the four channels of ISDN are made independent. on the other hand,
The correspondence with the two outside line buttons for the analog network may be determined one to one or may be independent.

As described above, according to this embodiment, when there is an incoming call that specifies the call channel 6B1 of the outside line 6,
The control unit 2 causes one of the outside line buttons 10-1 and 10-2 in which the lamp is off to blink, and rejects the incoming call when both of them are lit or blinking. On the other hand, when the outside line buttons 10-1 and 10-2 whose lamps are off are pressed, the control unit 2 lights the lamp of the pressed outside line button. After that, when the telephone number is input by the dial button 12 and the start button 13 is pressed, the outside line 6
By making a call on a vacant channel among the call channels 6B1 and 6B2 of, the incoming call is received from the time the external line button is pressed until the start button is pressed,
It can be prevented that the call cannot be made.

In other words, by freeing the correspondence between the logical channel of the outside line and the outside line button, there is an effect that the probability of collision of arrival and departure is reduced, and the operation efficiency of the apparatus is greatly improved.

FIG. 7 is a block diagram of a button telephone apparatus according to a third embodiment of the present invention. In the figure, 100 is a dedicated extension telephone equipped with an outside button, 101 is an extension interface section, and 102 is a telephone call. Reference numeral 103 is a digital transmission path, 104 is a digital interface section, 105 is an analog transmission path, 106 is an analog interface section,
Reference numeral 107 denotes a central control unit (CPU), 108 denotes a ROM (read only memory) in which a control program section and the like are stored,
Reference numeral 109 is a RAM (random access memory) for storing various data and the like, and 110 is a timer counting circuit.

FIG. 8 is a plan view of the private extension telephone 100. 400 is a private extension telephone main body, 401 is a handset, 402 is a display unit including an LCD (liquid crystal element), 403 is a numeric keypad, and 404 is a numeric keypad. Is an outside line button, 405 is a redial button, 406 is a start button, and 407 is a cancel button.

FIG. 9 shows a part of the data contained in the RAM 109. "TMRFLG" of M500
Is data that determines whether or not to activate the timer counting circuit when a call setup from the network is detected during a call origination operation.
“0” indicates that it is not activated. In order to activate it, the cancel button 40
"1" in the order of pressing 7 and pressing the start button 406
To set. To cancel, set "0" by the same operation. Further, "DGRFLG" of M501 invalidates the redial operation when "1" is set in the area where "1" is set when even one digit of the dial number is input during the calling operation. "RDLARA1 to n" of M503 is a redial data storage area, and the number of digits is "DGTCN" of M502.
Further, M502 and M503 can be cleared by pressing the cancel button 407 and the redial button 405 of the dedicated extension telephone.

The control in the key telephone system according to this embodiment will be described with reference to the flow charts of FIGS.

In step S400 of FIG. 10, the CPU 10
7 determines whether or not an operation for capturing an outside line has been performed, that is, whether or not the outside line button 404 has been pressed. When the outside line button 404 is pressed, whether or not the type of the selected outside line is an ISDN (Integrated Service Digital Network) line is checked with reference to the RAM 109 in step S401. If not, transmission processing to the analog line etc. is performed. The type of external line is registered in the RAM 109, and the CPU 107 stores in the RAM 109 which external line (channel) is selected.

If the ISDN line has been selected, in step S402 the system waits for the input of dialed digits by the ten-key pad 403 for transmitting to an outside line. If there is an input, the CPU 10
7 determines in step S403 whether it is the first number. This is determined by whether or not the memory M501 "DGRFLG" (dial input start flag) is "0".
The "DGRFLG" in the memory M501 is set to "0" when the call is established and the call is finally released.

If the input dialed number is the first number, then in step S404, "DGRFL" of M501.
Set "1" to G "(dial input start flag),
In step S405, "1" is set in M502 "DGTCNT" (digit number counter). Also, step S406
Then, all the memories M503 "RDLARA1 to n" are cleared, and the first digit dialed in step S407 is set to "RDLARA1".

After the second number, "DGTCNT" (digit number counter) of the memory M502 is incremented by 1 in step S408. In step S409, the received digits are sequentially set to "D".
"RDLAR" indexed by the value of "GTCNT"
It is stored in a predetermined area of "A".

The CPU 107 causes the display unit 40 to display each time a numeric value for each digit of the dial number is input by the ten keys 403.
Display the number of each digit of the dial number on 2.

The CPU 107 also waits for the start button 406 to be pressed in step S410. When the operator finishes inputting the partner number and presses the start button 406, "DGRFLG" (dial input start flag) is referred to in step S411. If this flag is "0", it is determined that there is no dial input, and the start button 40
The depression of 6 is ignored, and the process returns to step S402.

On the other hand, when "DGRFLG" is "1" (there is dial input), "TMRFL" is entered in step S412.
G "(call origination / arrival collision occurrence flag) is referred to, and it is" 1 "
If so, the timer counting circuit 110 is activated. Also,
If "TMRFLG" is "0", the timer counting circuit 110 is ignored and the process proceeds to step S414.

The CPU 107 detects the expiration of the timer from the timer counting circuit 110 in step S413, or, if the timer has already expired, edits the information elements for call setup transmission in step S414. Then, step S415
ISDN via the digital interface unit 104
The call setting is transmitted to and the state transits to a state of waiting for a response from the other party.

When the CPU 107 detects that the redial button 405 is pressed in step S420, it refers to "DGRFLG" (dial input flag) in step S421, and if it is "1", redial is invalidated.
It returns to step S402. On the other hand, if "DGRFLG" is "0", the CPU 107 refers to "DGTCNT" (dial digit number counter) in step S422,
If it is "0", it is determined that the redial data cancel operation has been performed, and the process returns to step S402.

On the other hand, if "DGTCNT" is other than "0", it means that there is redial data.
Similar to when the start button 406 is pressed, step S41
Go to 2.

Here, the CPU 107 reads the dial number for redial from "RDLARA" and displays it on the display unit 402. It then checks if a timer is counting which waits until the network no longer ignores the outgoing call setup. If the time is up in step S413, or if the time is already up, the CPU 107 reads out the dial number stored in "RDLARA" in steps S414 and S415 and transmits the call setting (for example, sends a call setting acceptance). ).

On the other hand, in step S500 of FIG. 11, if the incoming call is from the ISDN, it is determined in step S501 whether the dedicated extension telephone has already selected the channel for which the incoming call has been made (external line). It is checked whether or not the button 404 is pressed. Then, if the channel is not selected, a normal incoming call process is performed.

If it is being selected, "DGRFLG" (dial input start flag) is checked in step S502. If "DGRFLG" is "0",
Since no one digit has been entered on the dial for outgoing calls, the outgoing call operation is stopped and normal incoming call processing is performed.

At this point, it is also possible to ignore "DGRFLG" and wait for reception of numbers or waiting for the redial button to be pressed. That is, when an incoming call is received, the incoming call can be ignored simply by selecting the extension or the channel.

Further, in step S502, the DGTCNT (digit number counter) may be judged and branched. That is, the number of digits already input is a predetermined digit (1 digit or 2 digits).
If it is a digit or the like), the incoming call may be ignored.

When "DGRFLG" is determined to be "1" in step S502, there is a dial input of one digit or more, and therefore no response (for example, call setting acceptance is sent) to the call setting of the incoming call, The process proceeds to step S503. In this state, the ISDN is waiting for the timer to expire, and during this period, the call setting for outgoing from this system is ignored.

Therefore, the CPU 107 carries out step S50.
In "3", "1" is set in "TMRFLG" (originating / ending call collision occurrence flag), and in step S504, the timer counting circuit 110 is activated. Timer counting circuit 110 at this time
The setting time is set to a value larger than the time when ISDN ignores the call setting of the call originating from this system.
If the timer counting circuit 110 is already set in step S504, the timer counting circuit 110 is reset and then restarted. This is ISDN IS
This is because when the timing of waiting for a response from the present system, which has received the call from the DN, has expired, the call is re-incoming.

Then, the processing is steps S402 and S41.
Returning to 0, the dial number reading process is continued.

The time-out of the timer counting circuit 110 set in step S504 is detected in step S213 of FIG.

If the start button 406 is pressed continuously while the redial button 405 is pressed, "DGRFLG" is "0", and therefore the CPU 107
Ignores pressing of the start button 406.

In the above embodiment, the operation at the time of redialing is explained, but the present invention can be applied to the case of speed dialing.

That is, the CPU 107 causes the numeric keypad 40 to
When the first digit of the speed dial is input by (3) (or the second digit or the like may be used), subsequent incoming calls are ignored and no response is made. Then, when the abbreviated number of a predetermined digit is input, the CPU 107 reads the dial number from the RAM without waiting for the input of the start button 406, and sends the call setting information from the digital interface 104.

The same applies to the one-touch dial.

It is assumed that the speed dial number and the one-touch dial number are previously stored in the RAM 109 by the ten keys 403.

The information stored in the RAM 109 is not limited to the information on the ten-key pad 403, and the start button 406
Information indicating that is pressed may be stored in the RAM 109.

That is, the CPU 107 causes the numeric keypad 40 to
After inputting the dial number by 3, start button 4
When 06 is pressed, a code indicating that the start 406 has been pressed is written in “RDLARA” of the RAM 109. This is the same when registering the speed dial or the one-touch dial.

Then, the CPU 107 depresses the redial key 405 and the one-touch dial key, and the numeric keypad 4
When the abbreviated number is input by 03, the dial number and the pressing code of the start button 406 are read from the RAM 109.

When the CPU 107 reads this pressing code, the digital interface 10 is pressed in the same manner as when the start button 406 is pressed during normal dialing (other than redial, one-touch dial, speed dial).
The call setup is transmitted according to 4.

The example in which the present invention is applied to the key telephone system has been described above, but the present invention can also be applied to a single digital telephone connectable to ISDN. In this case, the control unit inside the telephone may be controlled based on the key input and the internal memory.

The number of connectable channels may be one or plural.

Further, the present invention is not limited to ISDN, and for example,
It can also be applied when sending a dial signal to a digital network in a business office.

As described above, according to the present embodiment, by not answering the incoming call while inputting the dial number, it is possible to prevent the outgoing call operation from being disturbed and improve the operability.

Further, erroneous dialing can be prevented by continuing the dial number storing process.

Furthermore, by transmitting the dial signal after the elapse of the predetermined time, the call can be established successfully.

[0077]

As described above, according to the present invention,
When selecting an outside line and making a call, even if a call originating / receiving collision occurs on the selected outside line, it becomes possible to select the outside line again and make a call, regardless of the operator's intention to make a call. Not only will there be no response, but there will be no discomfort to the other party due to unexpected communication with the other party. Furthermore, it is not necessary to make a redial call to the other party after making a response once, and the operation at the time of calling becomes simple. An excellent telephone exchange device can be provided.

Further, according to the present invention, by preventing the incoming call from being answered while the dial number is being input, it is possible to prevent the outgoing call operation from being disturbed and improve the operability.

By continuing the dial number storage process, it is possible to prevent erroneous dialing.

Further, by transmitting the dial signal after the elapse of the predetermined time, the call can be surely established.

Further, according to the present invention, by freeing the correspondence between the logical channel of the outside line and the outside line button, there is an effect that the probability of a collision of arrival and departure is reduced and the operation efficiency is greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a first telephone exchange system embodying the present invention.

FIG. 2 is a detailed block diagram of an outside line interface unit of the first embodiment.

FIG. 3 is a flow chart showing an operation at the time of making an outside line in the first embodiment.

FIG. 4 is a configuration diagram of a second embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the control unit according to the second exemplary embodiment of the present invention when making a call.

FIG. 6 is a flowchart showing an operation of the control unit according to the second exemplary embodiment of the present invention when an incoming call is received.

FIG. 7 is a block diagram of a third telephone exchange system embodying the present invention.

FIG. 8 is a plan view of a dedicated telephone housed in the telephone exchange system of the third embodiment.

FIG. 9 is a diagram showing the contents of a memory of a third embodiment.

FIG. 10 is a flowchart at the time of making a call according to the third embodiment.

FIG. 11 is a flow chart at the time of an incoming call according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 main device 2 control section 3 memory 5 external line interface 6 external line 8 telephone 10 external line button 11 external line button 12 control section 14 memory section 15 sound source generation section 16 external line interface 100 dedicated internal line telephone 101 internal line interface section 102 call path section 103 digital transmission line 104 Digital Interface Unit 105 Analog Transmission Line 106 Analog Interface Unit 107 CPU as Central Control Unit 108 Including Program Unit for Implementing the Present Invention ROM 109 Including Data 110 Timer Counting Circuit

Claims (10)

[Claims] 1. In a communication device accommodating a plurality of analog lines and a plurality of communication terminals, a means for storing a use state of the analog line, a detecting means for detecting an incoming call to the analog line, and a use state for the use state. With reference to the selection means for selecting an empty analog line from the plurality of analog lines, and a calling for making an analog line selected by the selection means based on a request from the communication terminal. Calling means, when the detecting means detects an incoming call to the free analog line selected by the selecting means, the selecting means selects another free analog line, and the calling means is A communication device characterized by making a call using another idle analog line. 2. The communication device according to claim 1, wherein the detecting means detects an incoming call based on polarity inversion of the plurality of analog lines or a calling signal. 3. The selecting means, when the detecting means detects an incoming call to an empty analog line selected by the selecting means, the selecting means outputs the call request to a communication terminal other than the communication terminal which has issued the call request. The communication device according to claim 1, further comprising means for notifying an incoming call. 4. Accommodating a plurality of lines and a plurality of communication terminals
In the communication device, the call request from the communication terminal for the plurality of lines
First detecting means for detecting, and the communication terminal is in use among the plurality of lines.
Second detecting means for detecting a line, and the number of lines for which a call request is detected by the first detecting means
And the second detecting means detects that it is in use.
And a detection result obtained by the first detection means and the second detection means.
A hand that searches for idle communication terminals based on the result.
Dan and reject the call if the sum equals the number of lines
However, if the sum is less than the number of lines,
Responding to the incoming call for the communication terminal in idle state
And a means for requesting the communication device. 5. Accommodating a plurality of lines and a plurality of communication terminals,
The plurality of communication terminals, in a communication device having a selection key corresponding to the line for selecting the plurality of lines, a first detection means for detecting a key input by the selection key; The second detection means for detecting an incoming call and the control means for performing a predetermined display according to the key input state by the selection key are provided, and the control means detects the incoming call by the second detection means. In this case, if there is a selection key that has not been key-input among the selection keys detected by the first detection means, a display corresponding to the state of the selection key that has not been key-input is performed. A communication device, wherein the incoming call is rejected when all selection keys are keyed. 6. Accommodating a plurality of lines and a plurality of communication terminals,
In the communication device, wherein the plurality of communication terminals have a selection key corresponding to the line for selecting the plurality of lines and a display device corresponding to each of the lines, the first communication device detects a key input by the selection key. Detecting means, second detecting means for detecting incoming calls to the plurality of lines, and control means for controlling display of the display according to a key input state by the selection key. When the incoming call is detected by the second detecting means, the unlit indicator is turned on, and when all the indicators are on, the incoming call is rejected. apparatus. 7. A plurality of lines configured by a plurality of logical channels and a plurality of communication terminals are accommodated, and the plurality of communication terminals have a selection key for selecting the plurality of lines, and In a communication device in which the correspondence between the logical channel and the selection key is independent of each other, when the communication terminal makes a call, the selection key used for the call is associated with an empty channel of the logical channels. A communication device characterized by associating a designated logical channel with an unused selection key when an incoming call is made to the line. 8. A means for inputting a number for identifying a communication partner, a means for detecting an incoming call from the communication partner, and when the incoming call is detected and the number is being input, the incoming call is received. Is provided with a control means for controlling so as not to respond. 9. The communication device according to claim 8, wherein the control means includes means for storing the number, and continues to store the input number even if an incoming call is detected. 10. A means for inputting a number for identifying a communication partner, a means for detecting an incoming call from the communication partner, and a predetermined time period when the incoming call is detected and the number is being input. And a means for controlling the number to be sent out later.