JPH05207156A - Telephone exchange system - Google Patents

Abstract

PURPOSE:To easily operate a line wire by permitting a transfer destination to be a line wire call state at the point of time when a transfer source telephone set is on-hooked after the transfer destination and a transfer source become an extension call state. CONSTITUTION:When a holding is operated in the dial operation of a telephone set under the line wire call, a line is picked-up in a DC closed circuit 3 and also the extension L2 is separated from the line wire L1 by corresponding relays r1-r6 so that the control circuit 11 becomes the holding state. When extension L2 is called so as to call the transfer destination by the transfer source dial operation, the state becomes the extension call state after the transfer destination responds. Then, when the transfer source is on-hooked, a hook and DP detecting circuit 2 detects it, the circuit 11 stops holding melody sound from a holding sound transmitting circuit 9 to the line wire L1, extension L2 is connected to the line wire L1 by the relay contact r of extension L2 in the transfer destination and also the DC closed state by the circuit 3 is released. Therefore, there is no necessity to release the holding in the transfer destination and the state automatically becomes the line wire call state so that line wire transfer is easily operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone exchange system capable of making an outside call and an extension call with a plurality of commercially available telephones and also performing an outside call transfer by dialing the telephones.

[0002]

2. Description of the Related Art Recently, a plurality of commercially available telephones are connected via an extension to a telephone exchange connected to an outside line which is a public telephone line, and a telephone exchange device is used to establish a communication path between an outside line and an extension line or between extension lines. There is provided a telephone exchange system which is formed by switching and enables outside calls and extension calls to be made with the above-mentioned commercially available telephone. This telephone exchange system calls extension calls,
Various processes such as paging, holding operation, and outside line transfer can be performed by dialing the telephone.

[0003]

By the way, in the above telephone exchange system, when the outside line transfer is performed to a specific extension line,
First, the dial operation (“0” dial) corresponding to the hold is performed to put the outside line call state on hold. After the hold operation, the extension of the transfer destination is called by dialing the transfer source telephone. In this case, the extension call can be made by dialing the extension of the transfer destination (for example, dialing any one of "1" to "6"). When there is a response from the extension of the transfer destination due to this extension call, the telephone of the extension of the fall source is on-hook by notifying that the extension transfer will be performed. As a result, the processing of the transfer source ends. Then, in order to start an outside line call at the transfer destination, the hold state may be released. In other words, the hold state can be released by dialing the transfer destination telephone (dial “0” again), and an outside call can be made.

In this type of telephone exchange system, the outside line transfer is generally performed by the above operation. However, with the above-mentioned outside line transfer method, there is a problem in that the transfer destination has to perform the hold release operation, and the operation is troublesome. The present invention has been made in view of the above points,
It is an object of the invention to provide a telephone exchange system in which an external line transfer operation is easy.

[0005]

According to the present invention, in order to achieve the above object, a holding operation and an extension calling operation after the holding are performed by a dial operation of a transfer source telephone for an outside line transfer. When the transfer destination responds to the extension call and the transfer source and the transfer destination are in the extension call state and the transfer source telephone is on-hook, the transfer destination is set to the outside call state at that time.

[0006]

The present invention has the above-mentioned configuration,
When the outside line transfer operation at the transfer source is completed, the outside line call state is automatically established without performing the hold release operation at the transfer destination, and the outside line transfer operation becomes easy.

[0007]

1 to 3 show an embodiment of the present invention. Book
The telephone exchange system of the embodiment is a simple type used for home use.
This telephone exchange system is shown in Figure 2.
In addition, it is a public telephone line through the divider G and the protector H.
Outside line L₁Telephone exchange A connected to the central office E,
Extension L as a communication line to the telephone exchange A of₂And signal transmission
Control line L as a line₃And the commercially available telephone C connected to each
Consists of multiple telephone outlets B that are detachably connected
And the outside line L at the telephone exchange A₁And extension L ₂Or
Extension L₂Switch the communication path between each other to form a telephone outlet
Telephone C connected to B can make external and internal calls
It has become so. In the case of this embodiment, the maximum
It is possible to connect up to 6 telephones with.

A modular jack M is provided in each telephone outlet B, and a general commercially available telephone C is detachably connected by this modular jack M. The telephone outlet B is also sent via the control line L ₃ and a speaker SP for reproducing a notification signal such as an extension ringing sound or a doorphone ringing sound sent via the control line L _3. Equipped with light emitting display units La and Lb for discriminating display signals which are voltage signals and displaying during an internal call or an external call, the speaker SP and the light emitting displays La and Lb perform notification and display operations. The volume of the speaker SP can be adjusted by the volume control switch VS.

Further, in this telephone exchange system, the intercom D is connected to the telephone exchange A by the telephone line L ₄ , and the intercom conversation can be performed using the telephone C. Note that the telephone exchange A also switches and forms the communication path between the intercom D and the telephone C. First, the configuration of the telephone exchange A will be briefly described together with the operation. In telephone exchanges A, as shown in FIG. 1, the relay contact r ₁ ~r ₆ provided for each extension L ₂ of the telephone outlet B is connected, extension L ₂ and external L ₁ in the relay contact r ₁ ~r ₆ The call current supply circuit 4 ₁ to 4 outputs the call current for an extension call or a doorphone call with the extension L ₂ disconnected from the extension L _{1 by} disconnecting the connection with
Supplied from 4 ₆ . The relay contacts r _{1 to} r ₆ are normally switched to the side for disconnecting the extension L ₂ from the outside L _1, and are switched to the side for the outside L ₁ only during an outside call.

An incoming call to the outside line is now detected by the incoming call detection circuit 5.
Then, the control circuit 11 composed of the CPU is
The extension L is driven by driving the signal generation circuit 23.₂Through doubt
Similar incoming signal (substantially the same as the incoming signal sent from the central office E)
, 16Hz) to telephone C,
Call the outside line by ringing the bell etc. built in machine C
It It should be noted that the pseudo incoming signal generation circuit 23 outputs the pseudo incoming signal.
Extension L₂The sending control circuit 24₁~ 24₆
Is provided, and this sending control circuit 24₁~ 24 ₆Behavior
Control is performed by the control circuit 11, and an arbitrary extension L₂Pseudo incoming
You can send a signal.

In response to this call, the handset of the telephone C picks up.
When raised, relay contact r₁~ R ₆Is the outside line L₁Cut off
Hook / DP (dial pad)
Rus) Detection circuit 2₁~ 2₆Is phone C off-hook?
The response state is detected from the control circuit 1 according to the detected output.
Extension L to which 1 responded₂Relay contact r corresponding to₁~ R ₆
To change the extension L₂To the outside line L₁Connect to the outside line
Allows you to make calls. The hook / DP detection circuit 2
₁~ 2₆In addition to detecting the hook state of the telephone C,
For dial pulse (DP) signals input from telephone C
It also detects the dial signal.

In this way, when the outside line call is started, the control circuit 11 causes the display control circuit 18 to send a display signal to each telephone outlet B through the control line L ₃ , and the light emission display portion La of each telephone outlet B. Is displayed to indicate that an outside line call is in progress. Next, when making an outside line from the telephone C, the receiver is lifted and dial operation is performed. In the following description, a case where the telephone line contract is a dial pulse line will be described. The off-hook state of the telephone C is detected by the hook / DP detection circuit 2, and at this time, the control circuit 11 drives the signal sound generation circuit 20 to simulate a dial tone (two tone) sent from the telephone station E. Send a dial tone to telephone C through extension L ₂ . The sending of the pseudo dial tone is stopped when the hook / DP detection circuit 2 detects the first dial signal.

By the way, in this type of telephone exchange system, telephone call processing such as extension calling is performed by inputting a specific dial signal from the telephone C, so that even if the telephone C is dialed, an outside line call is made. However, there is a case of other call processing such as extension calling. Therefore, the control circuit 11 receiving the dial signal starts the outside line transmission operation only when the number of digits of the dial signal exceeds the number of digits of the dial signal allocated for call processing (two digits in this embodiment). To start. This external line transmission is performed by once DC-closing the direct-current closing circuit 3 to capture the line and then driving the DP sending circuit 6 to send a DP signal to the external line L ₁ via the diode bridge DB.

When the other party responds to the call from the outside line, the polarity of the outside line L ₁ is inverted. Therefore, this polarity inversion is detected by the polarity inversion detection circuit 16 and then the outside line L ₁ and the telephone set C which has made an outside line. The relay contact r is switched so as to connect with the extension line L ₂ connected to the external line L ₂ to enable an external line call. Also at this time, the display control circuit 18 causes the telephone outlet B to display the outside line communication.

A dial tone transmitted through the outside line L ₁ , for example, a busy tone is detected by the outside line tone sound detection circuit 8.
At that time, a busy tone is sent from the signal sound generating circuit 20 to the telephone C which has made an external call, through the extension L ₂ . When making an extension call, the receiver is lifted and a dial signal is input in the same manner as in the case of making an outside call. The control circuit 11 determines from the number of digits of the dial signal that this extension call is made. At this time, the notification sound generation circuit 17 is driven to control the control line L corresponding to the telephone C on the called side.
_A notification sound signal is sent to the telephone outlet B through ₃ to cause the speaker SP of the telephone outlet B to ring the extension ringing tone. When the hook / DP detection circuit 2 detects that the telephone C is off-hook in response to the called side, the control circuit 11 controls the crosspoint switch 10 to extend the extension L corresponding to the telephone C on the calling side. ₂ and called telephone C
In response to the above, the extension L ₂ is connected to enable extension communication. At this time, the display control circuit 18 causes the telephone outlet B to display the extension call state.

By the way, although the above-mentioned extension call is made to a specific telephone C, if the telephone C to be called is unspecified, a simultaneous call can be made. In this case, the dial signal corresponding to the general call is sent to the telephone C.
Input from the telephone outlets B all simultaneously ring the extension ringing tone, and when one of the telephones C is off-hook in response to the call, the detection output of the hook / DP detection circuit 2 corresponding to the telephone C is output. In response, the control circuit 11
Is the extension L ₂ corresponding to the telephone C and the calling telephone C
The extension L ₂ corresponding to is connected by controlling the crosspoint switch 10 to enable extension communication.

By the way, in the above description, the case where the line contract is the dial pulse line is explained, but when the line contract is the push button line, the PB signal from the push button type telephone C is used. The dial signal is detected by the PB receivers 12 and 13, and the line is closed by the DC closing circuit 3.
It operates in the same way as a dial pulse line except that it sends a dial signal to ₁ .

Next, the case where the intercom is called will be described. In the case of the present embodiment, two intercoms D can be connected. The intercom calling detection circuit 14 detects that the push button of the intercom D has been pressed, and the control circuit 11 receives this detection output. Causes the alarm sound generation circuit 17 to send an alarm sound signal corresponding to a call to the intercom to each telephone outlet B, and the telephone outlet B causes the intercom ring tone to ring. When the handset of one of the telephones C is picked up in response to the calling of the intercom, the control circuit 11 switches the call line L ₄ of the calling intercom D and the extension L _{2 of the} telephone C that responds to the switch S ₁ , S. Turn on one of the _two ,
And by connecting the cross point switch 10,
Enables intercom calling. Here, the intercom communication is performed via the intercom communication circuit 15. The intercom call can be made by calling the intercom D from the telephone C.

By the way, when the electric lock I is installed at the entrance or the doorway, the opening / closing control of the electric lock I can be performed using the telephone C during the intercom call. . In this case, when a specific dial signal is input from the telephone C during the intercom call, the opening / closing signal is given to the electric lock controller K through the opening / closing control circuit 26 so that the electric lock I can be locked / unlocked by remote control. Is becoming

Further, in the telephone exchange A, a security device (abnormality alarm device or emergency push button) is connected so that an emergency alarm can be issued by using the telephone outlet B or the intercom D. Here, the abnormality signal and the alarm signal are given to the control circuit 11 via the abnormality detection circuit 27. In addition, it is possible to receive various services such as call waiting service and triophone service carried out by NTT, and the call processing at this time is performed by the predetermined telephone C as in the case of extension call. It can be operated by dial operation (including hooking operation). Further, the telephone exchange A is a commercial power source (AC100
V) is used as a power supply, and the power supply circuit 28 creates and supplies power for each part from a commercial power supply.

By the way, in the telephone exchange A of this embodiment,
The facsimile F can be connected to one specific extension L ₂ . When the facsimile F is unnecessary, the telephone C is connected to this extension L ₂ . In this embodiment, the facsimile incoming signal (1300 Hz) sent from the telephone central office E is detected so that the telephone C can receive the non-ringing incoming call service in which the facsimile F is automatically answered without ringing the ringing tone. A facsimile incoming signal detection circuit 22 is provided.

Now, the facsimile incoming signal detection circuit 22
When the facsimile incoming signal is detected by the control circuit 11, the control circuit 11 sets the extension L ₂ to which the facsimile F is connected to the external line L ₁
Connect to. As a result, if the facsimile F is compatible with the silent ringing service, the facsimile F can be automatically answered. The outside line transfer operation of the telephone exchange system of this embodiment will be described below with reference to FIG. Now, if an outside line transfer is performed during an outside line call, a holding operation is performed by dialing the telephone C as shown in FIG. The dial signal input by this dial operation is detected by the hook / DP detection circuit 2 or the PB receiver 12. When the outside line transfer operation is detected in this way, the control circuit 11 causes the DC closing circuit 3 to capture the line, and the relay contact r
Thus, the extension L _{2 of the} transfer source is disconnected from the outside line L ₁ , and the holding tone sending circuit 9 sends a holding melody sound to the outside line L ₁ . As a result, the holding state is set as shown in FIG.

After this holding, the extension is called by the dial operation of the transfer source. It should be noted that this extension call can be called individually for each extension L ₂ or can be called all at once, as described above. For example, when performing an individual call, dial by selecting any one of the extension L identified every _two "0" to "6". When calling all at once, dial "9". As a result, the extension call is made to the specific extension L ₂ or all the extensions L ₂ other than the transfer source as shown in FIG. 3C. The individual call and the simultaneous call are sent to the telephone outlet B by appropriately sending the ringing tone signal output from the alarm sound generating circuit 17 to the control line L ₃ via the crosspoint switch 10 as described above. It is emitted from the speaker SP.

When the call is answered as shown in FIG. 3D, that is, when the telephone C ₁ is off-hook, this is detected by the hook / DP detection circuit 2. Upon receiving this detection output, the control circuit 11 causes the crosspoint switch 1
0 to form a extension call path between the extension L ₂ there is a response the transfer source extension L ₂ in. By this, the extension L that responded
_An extension call can be made between ₂ and the transfer source extension L ₂ .

At this time, by the extension call, the transfer source informs the response side, that is, the transfer destination that the external line transfer is to be performed. Then, when the transfer source telephone C is hooked on-hook,
The extension call path is opened and the extension call state ends. Here, in the case of the conventional outside line transfer method, after that, a hold release operation is required in the transfer destination telephone C. However, in the case of the present embodiment, when the telephone C of the transfer source is hooked on-hook, the hold state is released at that point, and the outside call can be made at the transfer destination. That is, when the hook / DP detection circuit 2 detects the on-hook of the transfer source telephone C, the control circuit 1
Stops the output of the hold melody sound from the hold sound sending circuit 9 to the outside line L ₁ , and then connects the extension line L ₂ to the outside line L ₁ by a relay contact r provided for the extension line L _{2 of the} transfer destination. At the same time, the direct-current closed state by the direct-current closed circuit 3 is released, and an outside line call can be made at the transfer destination.

In this way, the hold releasing operation at the transfer destination can be made unnecessary, and it can be prevented that the outside line call cannot be made by an erroneous operation by the transfer destination user.
In the case of this telephone exchange system, a response to an extension call or a doorphone call during an outside line call can be made by almost the same operation as the above-mentioned outside line transfer operation, but since this point is not related to the present invention, the explanation will be omitted. Omit it.

[0027]

As described above, according to the present invention, a holding operation and an extension calling operation after the holding are performed by the dial operation of the transfer source telephone for the outside line transfer, and the transfer destination responds to the extension calling after the holding. If the transfer source phone goes on-hook after the transfer source and transfer destination are in the extension call state, the transfer destination is set to the outside line call state at that point, so the outside line transfer operation at the transfer source ends. Then, even if the hold release operation is not performed at the transfer destination, the external line call state is automatically established, and the external line transfer operation becomes easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic circuit configuration of a telephone exchange device according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram of a telephone exchange system using the same as above.

FIG. 3 is an explanatory diagram of a main operation of the above.

[Explanation of symbols]

A Telephone switchboard C Telephone L ₁ External line L ₂ Internal line r Relay contact 2 Hook / DP detection circuit 3 DC closing circuit 9 Hold sound sending circuit 10 Crosspoint switch 11 Control circuit 12, 13 PB receiver

Claims (1)

[Claims] 1. A telephone exchange connected to an external line which is a public telephone line, and a plurality of commercially available telephones connected to the telephone exchange via an extension line, and the telephone exchange has an external line and an extension line or extension lines. In a telephone exchange system in which the telephone line can be switched to form an outside line call and an extension line call at the telephone, and an outside line transfer can be performed by dialing the telephone, a holding operation and a dialing operation by the transfer source telephone can be performed for the outside line transfer. The extension call operation after the hold is performed, and when the transfer destination answers the extension call after the hold and the transfer source and the transfer destination are in the extension communication state and the transfer source phone is on-hook, transfer is performed at that point. A telephone exchange system characterized in that the destination is an outside line telephone call state.