JPS63135095A - Telephone system - Google Patents

Abstract

PURPOSE:To send a message regardless of the state of a telephone set of a called party by reproducing a talking voice signal from a caller telephone set called from a telephone receptacle by means of a speaker of the telephone receptacle. CONSTITUTION:The telephone receptacles 101... are provided with a modular jack 45 connected to lines L1, L2 of an extension 5 and a series circuit comprising a capacitor 47 and a speaker 48 are connected between lines L3, L4 of a control line 6 in the inside. A speaker 48 is energized by a sound signal sent from a master equipment 1 through the lines L3, L4 of the control line 6 to inform the call from doorphones 31... and the extension 5 and a talking voice sent on the control line 6 is reproduced at the extension call. Thus, the message is sent regardless of the state of the called telephone set.

Description

[Detailed description of the invention] [Technical field] The present invention relates to telephone systems.

[Background technology] Conventionally, this type of telephone system includes general standalone telephones,
There is a system that connects a doorbell to a simple PBX to configure a so-called home telephone system, but in this system, when an incoming call is received, the ringing function of the standalone telephone is used to indicate the incoming call, so it is difficult to tell whether the call is coming from an outside line or an extension. There was a large fish that it was difficult to tell whether it was coming from a doorbell or a doorbell. In addition, in calls between general telephones connected to extensions,
There was an inconvenience in that it was not possible to configure a function to directly transmit the message to the other party without making a ringing sound, and the message could not be transmitted until the other party picked up the handset in response to the call.

[Object of the Invention] The present invention has been made in view of the above-mentioned problem α, and its object is to provide a telephone system.

[Disclosure of invention] The present invention will be explained by examples.

(9) FIG. 1 shows the whole of one embodiment of the telephone system of the present invention.
In this embodiment, extension calls are possible, and the main device 1 is connected with an outside line #12 from the telephone office and a call #14 connected to the door phone 3 as an outside line. ,
Furthermore, a plurality of sets of internal lines consisting of internal a5 and one control M6 are connected. Each internal line has 10 telephone outlets. ...is connected.

FIG. 2 shows a circuit block diagram of an embodiment of the main device l, in which #iL, which forms outer #i2, and L2 include an incoming call detection section 7 for detecting an incoming signal, a hold circuit 8, and a push button. A 4#i telephone outlet 10 is connected to a coupling transformer 9 for extracting signals, and is also provided for connecting to an internal line. . . . The switching contacts 2011 of the outside line switching relays Ryl+ . It is connected via...

In addition, the main device 1 is provided with a plurality of connection terminals 121 for connecting the call M4 of the door phone 31.
21... have a calling signal detecting section 141... and a backtone transmitting section 151 of the door intercom 31..., respectively.
. . , and is connected to the door phone communication circuit 13 via the switching contact 16 of the door phone switching relay Ry2. Door phone call, circuit 13 is door phone call connection relay RY3
Relay connection, α17 and each telephone outlet 10I...
Each extension connection relay R) is provided correspondingly to
Relay connection of F4+2..., α1 B ,, 18.2
...and 1 DC cut capacitor 19. The switching contacts 20. of each external line switching relay Ry, . . .・
It is connected to the a contact of... At the connection point between the relay contact 17 and the relay contact 18.1, there is another relay contact of m connection relay RVs+, ζ21. and the output of the sound source generator 23 are connected via the DC cut capacitor 22. Further, the output of this sound source generating section 23 is connected via a capacitor 22 to the back tone transmitting section 15° .
Each relay contact 18.2 . . . ．．・
...and capacitor 19. It is connected to the connection point of ....

(telephone outlet) The output of the I/F audio amplification section 24 is connected to a DC cut capacitor 26 and an extension call relay Ry61 provided corresponding to each telephone outlet 101...
each telephone outlet via relay contact 251)1
0. ... is connected to the terminal connection terminal corresponding to mL3 of the control line 6.

A control circuit 11 consisting of a CPU performs control processing for the driver transistors of each of the relays mentioned above, selects the sound of the sound source generator g23, and performs backtone transmission section 15. . . , control of the hold circuits 8 and 1 hold tone generation section 29, determination of the incoming call detection signal of the incoming call detection section 7, and control of the call signal detection section 14. . . , and furthermore, the hook/dial pulse detection section 30. . . . Alternatively, the line number detected by the Bushini button dial signal receiving section 31 is determined. In the figure, reference numeral 11 indicates a current supply source for the extension line.

Telephone outlet 10. ... is extension 5 #i L 1.
It is equipped with a monocular cable 45 connected to L2, and the #! of control line 6 is installed inside as shown in FIG. L3,
A series circuit of a capacitor 47 and a speaker 48 is connected between L4. Speaker 48 is MLl of control #X6
, L, are ringed by the sound source signal sent from the main device 1, and the doorphone 3. It is possible to notify of incoming calls from .

Next, the operation of the telephone system of this embodiment will be explained in more detail.

FIG. 4 shows the installation of the control program for the main device 1, and the main processing is divided into three groups: initialization at system start-up, input processing, and output processing. A chart is shown in FIG. Initialization is further divided into two: Ilo/memory initialization and interrupt/timer initialization. Ilo memory initialization sets initial values in the memory inside the control circuit 11.

That is, the control circuit 11 is connected to each telephone outlet 10. In order to manage the state of the general standalone telephone T connected to . . . as state variables, the main operation is to set various state variables, and the initial value set in the memory is to initialize these variables. . Further, I10 initialization is to set the incoming call display and the control of each relay to the initial state.

Interrupt/timer initialization requires periodic access to input signals,
Set the related functions of the control circuit 11 so that interval interrupts for controlling time elements can be used.6 Human processing controls the state variables held in the memory of the control circuit 11 in response to the occurrence of various input events. The 70-chart is shown in FIG. This input processing further includes the 7-key on/off processing shown in FIGS. 7(a) and 7(b), the dial input processing shown in FIG. 8, and the dial input processing shown in FIG. 9(a).
) # outside shown! The processing is classified into incoming call processing and intercom call processing shown in FIG. 9(b) of the MS9.

First, in the input process, the 7 dial pulse detection unit 3 inputs the 7 dial on/off of the connected general telephone Iso T.
01... (or Bushe button dial signal receiver M part 3
Detected in 1). When the detection signal shown in FIG. 10(a) first rises, the hook-off and control circuit 11
is set to f1, and the hook-off process shown in FIG. 7(a) is performed.

In other words, in this process, it is determined whether a call is being received from outside AI 2, and if the call is being received, processing is carried out while the outside #i2 is talking, and if no call is being received, it is determined whether or not the door phone 31 is ringing, and the call is made. If inside, call the doorbell 3. ...If there is no call, it is determined whether or not internal M5s are calling each other. #
If the outside line 2 is usable, processing is carried out while the outside line 2 is in use, and if it is not available, processing is carried out while the outside line 2 is in use. Therefore, if there is no call to the extension 5, an incoming call from an outside line, or a call from the doorbell, the extension 5 connected to the telephone T will be connected to the outside line 2 at the same time as the hook-off.

Then, when there is the final fall mentioned above, it is determined that 7 is on, and based on this determination, it is determined whether outside #12 is in use, and if outside line 2 is in use, outside line 2 is opened; If not, determine whether extension 5 is in use,
If the inner #85 is in use, open the inner #15, and if the inner #15 is not in use, it is determined whether the door phone #3,... is in use, and the door phone #15 is opened. If ... is in use, the doorbell 3.・
. . . If the telephone line 4 is not in use, the connected general standalone telephone fiT is placed in a dormant state. Further, when a dial operation is performed from hook-off to 7 hook-on and a dial pulse P is detected as shown in FIG. 10(a), the control circuit 11 uses this dial pulse P as shown in FIG. Based on this dial data, processing such as hold processing and intercom calls is performed.

In other words, as shown in Figure 8, it is determined from the dial data whether the call is to outside line M2 or not, and if the call is to outside line 2, the call is dialed as is, and if the call is not to outside line 2, the dial data is used to either call the extension or put it on hold. Determines whether the call is to be processed, released from hold, or called by doorbell.

FIG. 10(b) shows the detection interval from hook-off to seven hook-ons.

To explain further, the control circuit 11 counts the interval time from the first dial operation to the second dial operation, and if there is no second dial operation within a certain period of time, it determines that it is not an outside line call, and based on the dial data. It does the processing. In this embodiment, the dials from "1" to "5" are the telephone outlets 10 and 10 of each internal line connected to the main device 1.
..., and dial "7" is a doorbell call, and furthermore, dial "0" while the hold circuit 8 is detecting a call is on hold, and the dial is on hold. "0" is assigned to release the hold, and the control circuit 11 performs input processing according to this assignment.

Now, when there is no dial input, the number of calls from the telephone office is 1 every 3 seconds.
When the incoming call detection section 7 detects an incoming call signal that rings for seconds, the control circuit 11 performs incoming call processing. This incoming call processing is shown in epJ9 figure (
Set the incoming call flag as shown in a). In other words, as shown in FIG. 11(a), the incoming call flag is set as shown in FIG. 11(b) at the first rise of the incoming call detection signal of the incoming call detecting section 7, and the flag is set constant from the last fall of the incoming call detection signal. After the off-delay time has elapsed, the flag is reset.

If no such incoming call is detected, it is determined whether there is a call from the door phone 31..., and if there is a call from the door phone 31..., the door phone call flag is set as shown in FIG. 11(b). It stands.

In other words, as shown in FIG. 12(a), the doorphone 3. ...
When the push button is operated and the call signal is detected by the call signal detection unit 141 and the detection signal is output, the control circuit 11 detects the rising edge of the detection signal as shown in FIG. Set the doorbell call flag and then connect the general standalone telephone 1F
When the 7-turn off of IT is detected as shown in FIG. 12(e), the 7-lag is reset. If this hook-off detection is not detected even after a certain timeout period, the flag is reset again. In this way, input processing is performed as shown in FIG.

Now, the power output processing includes a connection process and an incoming call display process as shown in PtSi3 diagram.The connection process determines whether an outside line call is in progress as shown in Figure 14, and if it is not in an outside line call, switches to the outside line. Switching contact 201 of relay Ry,...
... to the B contact side and disconnect the outside M2 upstream #15, and if an outside line call is in progress, connect the outside line switching relay Ry,...
After switching, connect q 201... to the B contact side, and connect the external M
2 and extension 5.

Then, it is further determined whether the extension call is in progress, and if the extension call is not in progress, the extension connection relay Ry 411 v RV
412... relay contact 1 B, , 1a, 2...
is turned off, and turned on during a call to enable connection between the internal circuit of the main device 1 and the extension 5. Next, the doorbell 31... determines which call is in progress f1, and if the call is not in progress, the relay contact 17 of the doorbell call connection relay Rye
Turn off the phone, turn it on if a call is in progress, and turn on the doorbell call circuit 1.
Connect the output of 3 to the internal circuit and extension 2.Next, if a doorbell call is in progress, the doorbell in use will be connected to the first doorphone 3. If it is the first door phone 3I, the switching contact 16 of the door phone switching relay RVz is connected to the b contact side, and if it is the second door phone 32 side, the switching contact 16 of the door phone switching relay RVz is connected to the a contact side. And outside R
Next, it is determined whether or not the call is in progress and is on hold, and if the call is on hold, the hold circuit 8 is turned on, and if the call is not on hold, the hold circuit 8 is turned off.

In the incoming call display control, when an incoming call signal from outside #I2 is detected as shown in FIG. ．． ... and turn off the extension connection relay RV.
s+ relay contact 21. Turn on.

If no incoming call signal is detected, fq is determined to determine whether or not a ringing signal is detected from the door phone 31..., and if detected, the incoming call notification tone for the door phone 31... is set, and the extension calling relay Ry,... Relay contact 25. ...
is turned on, and relay contacts 21, . Turn off 21□. If there is no detection, it is determined whether there is an extension call, and if an extension call is detected, the extension ring tone is set and the relay corresponding to the extension on the called side is activated in extension call relay R7g +... Operate the relay contact 25. ...
is turned on, and the relay connections of extension connection relays R'1qltRys□, α21, . Turn off 21□. If there is no extension call detected, it detects whether it is on hold, and if it is on hold, it sets the hold 1!
Relay contact 25 of yr++... . . , turn on the extension connection relay R5's+yRy, relay contact 21 of 2,
．． Turn off 21□. Also, if the call is not on hold, a silent setting is made and the relay contact 25 of the extension call relay Ry61... ...and extension connection relay Rys++RFsz
Relay connection, α21. ．． 212 is turned off.

In this manner, in the incoming call control processing routine, the control circuit 11 determines the state and sets the mode of the notification sound from the sound source g23 and the notification sound of the connected general standalone telephone fiT. .

When an incoming call signal is received from the outside #i12, the control circuit 11 determines the incoming call based on the incoming call detection signal from the incoming call detection section 7, sets the incoming call notification sound, and sets the extension call relay RV m +...・Turn off the relay contacts 251..., and turn on the relay contacts 21□212 of #X unconnected relays RS's, , Ry5□. At this time, external line switching relays Ry, . . . are switching contacts 20. ... is connected to the B contact side, so the ring tone from the telephone office is heard from each telephone outlet 10. The announcement will be made from the general standalone telephone fiT connected to...

Here, when the handset of a general standalone telephone I/piT is raised and 7 tsu quo 7, this hook-off becomes a hook-off.
Detected by the dial pulse detection section 30 and transmitted to the control circuit 1
Based on this detection, No. 1 determines that a call has been made to outside #X2. From this state, the telephone outlet is in a non-calling state for outside M2)10. When the handset of the general standalone telephone Iso T connected to . Switching contact 2 of relay RyI-・
0. . . . is switched to the A contact on the extension side, and the relay contact of the extension connecting relay Ry, +2 . . . is 181°.

. . is turned on, and a sound source signal such as "bupppup..." from the sound source generation unit 23 indicating that the extension is available during an external line call is transmitted to the relay contact 21. of another extension connection relay RF51. and the relay contacts 18, 2...,
After switching, it is sent to extension 5 corresponding to the telephone outlet through α20 Bi... and connected to the general standalone telephone f.
Make a ring from the iT receiver.

Next, the push button of the door phone 31... is repeatedly pressed, and the door phone 3. When there is a call from..., this call signal is detected by the corresponding call signal detection section 14..., and the control circuit 11 determines that there is a call from the door phone 3I.... Based on this determination, the control circuit 11 controls the relay contact 1 of the doorphone call connection relay Ry3.
Door phone 3.7 turned on and the switching contact 16 of the door phone switching relay Ry2 made a call. ...Switch to the side. In addition, the relay contacts 18□... of the inner #i connection relay Ry411... are turned on, and the door phone call circuit 13 can be connected to the inner #15, and the internal connection relay R
Turn on relay contact 21□ of V52. Furthermore, the relay contact 25 of the extension call relay RFs+... . . . and connect the output of the I/F amplifier 24 to the control [telephone outlet 6].

In addition, the control circuit 11 controls the sound source so that the type of sound source signal output from the sound source generating section 23 is called, and the signal has a corresponding tone color, melody, etc. that is assigned so as to be able to identify the door phone 3, etc. that has been operated. The generator 23 is controlled.

Then, the speaker 48 of each telephone outlet 101 will emit a notification sound indicating that there is an incoming call from the door phone 31. , On the other hand, the doorbell that performed the calling operation 3. ... side, the corresponding backtone sending W115 is turned on by the control circuit 11 and the sound source generating section 2 is turned on by the control circuit 11.
The sound source signal from 3 is input as a back tone and is emitted from a speaker (not shown) of the door phone 3.

Now, doorbell 3. An incoming call will be notified, and any telephone outlet 10. When the handset of the general standalone telephone T connected to ... is picked up, the outside line switching relay Ry corresponding to the telephone outlet 101 to which the first picked up general standalone telephone fiT is connected is connected.
, , . . . , r:f, 20 + . At the same time, the sound source generation ff523 is set to a silent state. If, for example, 30 seconds have elapsed after the calling operation has been performed and there is no call 7 from any of the telephones IaT, the notification indicating an incoming M message is automatically stopped.

After this, when the handset of the general standalone telephone fiT connected to another telephone is picked up, the other telephone 8! If T is on an outside line call, the outside line connection relay Ry
,... switches to the extension side, and at the same time the relay contacts 1812... of the corresponding extension connection relays Ry,...2 turn on, and the output of the sound source generator 23 is connected, but since there is no sound. There is no sound from the handset, which indicates that an outside line is in use. Also, if the outside line is not in use, the outside line switching relay Ry corresponding to the telephone outlet 101 connected to the telephone fiT from which the handset was removed
,,... is the control circuit 11! Since the switching contact 201 is connected to the outside line 2 side under the II control, an outside line dialing tone is heard from the handset, and it is known that the outside line is available for use.

Now, when the call ends and the handset of the telephone T is turned on, the control circuit 11 returns to the state before the call.

In the above case, the explanation was made assuming a call from the doorbell 3I..., but once the call is ended, the call is made from the phone ff1.
When calling the doorbell 3I... from T@I, it is preferable to pick up the handset of the telephone fiT, perform dialing, and send a predetermined number, that is, the number assigned to the doorphone call, for example 7''.

That is, based on this dial data, the control circuit 11 selects the telephone outlet 101 to which the telephone fiT is connected.
... to the doorphone call circuit 13, connect the switching contact 16 of the doorphone switching relay RYz to the doorphone side where the last call operation was performed, set the state in which it is possible to talk to the doorphone, and then switch the doorphone switch again. You will be able to talk to the phone.

Next, when a call is to be made between extensions, it is sufficient to pick up the handset of the telephone T and dial the extension number of the other party. If the handset is picked up and only dial data for an extension call is detected within a predetermined time when the outside line 2 is open, the control 1 circuit 11 determines that the call is an extension call, and calls the phone to which the fiT phone is connected. External line switching relay Ry corresponding to outlet 101...
Connect the switching contact 201... to the A contact side on the extension line side, and at the same time connect the corresponding inner #i connection relay Ry412...
Turn on the relay contacts 18, 2, etc. Also, an extension call relay Ry corresponding to the called side's telephone line 101...

Relay contact 25. The control circuit 11 turns on and sets the sound RI signal of the sound source generator 23 to the type of extension call. Therefore, the sound a signal amplified by the I/F amplifier 24 is transmitted to the called telephone outlet 101.
... drives the speaker 48 of the
When a certain period of time has elapsed after the notification with a "boo-boo" sound, the control circuit 11 stops the operation of the sound source generator 23, and also closes the relay contact 21 of the inner S connection relay Ry, 2.
, connects #i5 of the called telephone fiT to the Hunsen r/F amplifier 24, and controls the call voice signal of the telephone T! It can be superimposed on the line L of No. 6: l, L, and sent to the telephone outlet 101 of the called side. Therefore, the speaker 48 of the telephone outlet 101 . In other words, messages can be transmitted whether the called party's general standalone telephone flT is busy, whether the handset is picked up, or whether the handset is not picked up.

Furthermore, the telephone 8 connected to the telephone outlet of the called extension number) 101... When T's handset is hooked off, the control circuit 11 connects the corresponding telephone outlet 101...
Switching contact 201 of external line switching relay Ry,...
· is connected to the A contact side of the extension line side, and at the same time, the relay contact 181□... of the corresponding extension connection relay RF412 is turned on, and the telephone fiTs of the calling side and the called side are connected through the internal Ai5. At the same time, extension call relay Ry,... relay connection, ':f, 25 l...
and relay contact 2 of extension connection relay Ry, 2.
Turn off 12. Further, the sound source signal of the sound source generator 23 is set to the sound source signal during an extension call, and its output is connected to the extension 5 through the relay connection α21+ of the extension connection relay Ry, . Now, if the outside #12 is not busy, and the handset of another telephone T goes off-hook while the inside #X5 is talking, the control circuit 11 will be connected to the corresponding telephone outlet)10. Switching of external line relay RFz corresponding to...! , 420+... is connected to the outside line 2 side, so the corresponding phone 11! An outside line dial tone will be heard from T's handset. Also, if a call is being made to the outside #12, the control circuit 11 will control the telephone outlet 10. Switching contacts 20 of external line relays Ry, . . . corresponding to . ...extension 5
Since the relay contact 1811 of the corresponding extension connection relay RF411 is turned on, the receiver of the telephone T can hear the sound due to the extension-in-use sound source signal output from the sound source generator 23. Become.

Now, if you want to make an outside line call when the outside line is not in use, the telephone outlet 10. All you have to do is pick up the handset of the telephone fiT connected to one of the terminals and dial the number. First, when 7 Tsukuo 7 is detected, the control circuit 11 switches the corresponding outside line switching relay Ry1□... Contact 2
0. is connected to the outside line 2 side, further dialing is performed,
After the first dial data is input to the control circuit 11 from the 7 dial pulse detection section 30, as shown in FIG. 16(b).
As shown in , the next dial data must be input within a certain period of time, for example 3 seconds! As mentioned above, the control circuit 11 determines that the internal extension line - is a doorbell call, but if the next dial data is input within 3 seconds as shown in FIG. 16(a), it is judged as an external line call. Control circuit 11
is determined, and the external line 2 and the corresponding phone fiT are connected without switching the extension side.
Maintain the connection state with.

By the way, if you want to put the call on hold while connected to outside line 2,
What is necessary is to operate the reservation circuit 8.

Next, the operation of this reservation circuit 8 will be explained.

First, when the telephone #a2 is called, the handset of the telephone T picks up the dial, and as shown in FIG. ,
As shown in FIG. 18(a), a current flows in accordance with the dial pulse. At this time, the light emitting diode LED2 of the photocoupler PH2 inserted into the other RL +
As shown in FIG. 18(b), no current flows through. Therefore, the control circuit 11 inputting the outputs of both photocouplers PH, , PH, determines that it is the time of calling. When the called party's telephone handset is picked up, the polarity of the outside line 2 is reversed, #XLl becomes H and #iL2 becomes L, current flows through the light emitting diode L E D 2 of the photocoupler PH2, and the other photocoupler P H+ light emitting diode LE
No current flows through D. In other words, it indicates that the phone is in a talking state.

Also, when a call is received from outside line 2, the incoming signal is shown in Figure 19 (
a) Light emitting diode L E alternately as shown in (b)
A current flows through D and -LE D2. At this time, the incoming signal sends a 16Hz signal for 1 second and then pauses for 2 seconds, so a pulse current flows for 1 second in the alternate light emitting diodes LED and LED2, and then no current flows in both light emitting diodes for 2 seconds. state. After the second state is repeated, when the handset of telephone T is picked up, at that point the line L2 becomes H1 and the line L1 becomes L.
Current flows through the light emitting diode LED, and no current flows through the light emitting diode LED2. In other words, it indicates that the phone is in a talking state.

Here, in order to determine that the control circuit 11 is in a call state both when making a call and when receiving a call, the control circuit 11 uses the photocoupler PH8 or the photocoupler as shown in FIG. 20(a) or FIG. 21(b). P Ht output continues for 5aIsec or more,
If so, the control circuit 11 sets a flag corresponding to each of them. The valid period of this flag is 3 seconds, and within 3 seconds, the output of the photocoupler P H or P Hz, which is opposite to the flag set, becomes H as shown in Fig. 20 (b) or Fig. 21 (a). , and if this state continues for 1 second, Figure 20 (
e) or as shown in FIG. 21(e), the control circuit 11 determines that the call is in progress. Note that since the determination is made as shown in FIGS. 20 and 21, the call determination can be made even when #RL and L2 of the outside line 2 are reversely connected.

Now, the situation jj3 (second
If you want to place the phone on hold (shown in Figure 2 (a)), first call
By dialing T, a number assigned to the hold, such as 0'', is transmitted. When this dialing is performed, the voltage level of line L2 changes during the dial pulse as shown in Fig. 22 (
As shown in b), it becomes L, and the Hook-Guillard pulse detection unit 30. ... is detected by the photocoupler PH, and inputted to the control circuit 11 as dial data. The control circuit 11 that inputs this dial data determines that the operation is on hold,
Turn on transistor Q1, drive relay Ry7,
Turn on the relay contact 55 and set the resistance R to #iL,,L.

Connect to and put it on hold. In this hold state, call fiT
The telephone outlet 10. ..., the output of the photocoupler PH becomes L. When the telephone T is connected again, the output of the photocoupler PH becomes H. To release the hold, a dial operation is performed to hook/dial detection unit 30. When dial data of '0'' is given to the control circuit 11 through . Wire the resistance R,
L, separate from the gap. At this time, the phone was already
is outside #! 2, it is possible to continue the call. ! @22 Figure (c) shows the output of the photocoupler PH, and IN (d) shows the pending state.

By the way, when a hold is set, a hold tone is generated from the hold tone generator 29 and sent to the telephone of the other party through the outside line 2.

When a call is received from the door phone 31 while an outside call is in progress, the phone 31...
．． When a dial number corresponding to, for example, "7" is transmitted, the corresponding 7 dial pulse detection unit 3
0. Control circuit 11 according to the dial data from...
activates the hold circuit 8, puts the phone on hold, and calls the phone 1fiT to the doorphone 3. in the same way as the doorphone call described above. Connect to...

Therefore, dialing only requires connection to the doorphone.

[Effects of the Invention] The present invention provides a telephone system in which the main device is provided with a means for superimposing the voice signal from the calling party's extension on the called party's control line during an internal call, and each telephone outlet is equipped with a means for superimposing the voice signal from the calling party's extension on the called party's control line. Since a speaker is provided to reproduce the superimposed voice signal, the call voice signal from the calling side telephone that calls the extension from the telephone station can be played back on the telephone station's speaker, so the status of the called side telephone can be reproduced. This has the effect that Messeno can be transmitted unilaterally regardless of the situation.

[Brief explanation of the drawing]

Fig. 1 is an overall circuit diagram of the first embodiment of the present invention, Fig. 2 is a circuit diagram of the main device of the same, Fig. 3 is a circuit diagram of the telephone outlet F of the same as the above, and Figs. @ Figure 9 is a 70-chart for explaining the operation of the same as above, Figures 10, 11, and 12 are time charts for explaining the operation of the same as the above, and Figures 13 to ff115 are 70-charts for explaining the operation of the same as the above. Chart, Figure 16 is a time chart for explaining the operation of the same as above, @1
Figure 7 is a circuit configuration diagram of the same holding circuit as above, and Figures 18 to 2
FIG. 2 is a time chart for explaining the operation of the above holding circuit. T...General standalone telephone, 1...Main device, 2...Outside line, 4...Talking line, 5...Extension line, 101...Telephone outlet, 45...Monular jack, 48...
・It is a speaker. Agent Patent Attorney Stone 1) Ai 7 Figure 4 Figure 6 Figure 5 Figure 8 (0) Figure 9 (b) Figure 10 Tayalhar 1 Rusu Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 figure

Claims (2)

[Claims] (1) The outside line from the central office and multiple extensions are star-connected, and when an incoming signal is detected from the outside line, an incoming call display signal is sent out via the control line corresponding to each extension. A means for determining whether a dial call is an external call or an internal call, and when the means determines that it is an internal call, a calling signal is sent via the control line of the called side corresponding to the dialed number, and the called side extension and the calling side are A main device that has a means for connecting an extension line and a predetermined extension line when making an outside line call, a telephone connection section connected to each of the extensions, and an incoming call display signal for an outside line from the main device that is connected to a control line. a telephone outlet equipped with an incoming call display means for receiving an incoming call and displaying an incoming call, and a calling means for receiving an extension call signal and displaying a call; and a telephone detachably connected to a telephone connection part of the telephone outlet. At least in the telephone system configured, the main device is provided with a means for superimposing the audio signal from the calling party's extension on the called party's control line during an internal call, and each telephone outlet has a means for superimposing the voice signal from the calling party's extension on the control line of the called party, and each telephone outlet has a means for superimposing the voice signal from the calling party's extension on the control line of the called party. A telephone system characterized by comprising a speaker for reproducing signals. (2) The telephone system according to claim 1, wherein the speaker is also used to notify a calling signal.