JP2938460B2 - Call transfer device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention captures an incoming call from one station line connected to a device when the incoming call is received from the other station line, and the other station line also connected to the device. And a call transfer device for selecting a call partner of the call exchange side central office.

2. Description of the Related Art A conventional call transfer device is shown in FIG. Reference numeral 100 denotes a configuration diagram of the call transfer device, which includes the following parts.

Reference numeral 103 denotes a bell detection unit that detects a bell signal transmitted from the central office 114 through the central office line 115 and the capacitor 102 for blocking DC power. The detection output of the bell detection unit 103 is input to the control unit 101 and used for incoming call determination. 104
Is a relay for supplementing the office line 115, which is controlled by the control unit 101 and forms / opens a DC loop with respect to the central office 114, and indicates the intention of calling, answering or ending the call. 105 detects an instantaneous interruption of the DC loop current indicating an end of the call transmitted from the central office 114 via the office line 115 (hereinafter, this instantaneous interruption of the DC loop current is referred to as a CPC signal), and notifies the control unit 101 of the interruption. This is a CPC signal detection unit to perform. The capacitor 106 cuts off the direct current of the central office line 115 and transmits only the speech voice band signal to the internal speech path 120. On the other hand, a capacitor 107, a bell detection unit 108, a relay 109, C
The PC signal detection unit 110 and the capacitor 111 are respectively a capacitor 102, a bell detection unit 103, a relay 104, and a CPC signal detection unit 10.
5. Performs the same function as the capacitor 106. Internal communication path 120
Connects the capacitors 106 and 111
A signal connection between the telephone line 115 and the office line 116 is made in the voice communication band. The control unit 101 determines whether there is a bell call on the local line 115 or the local line 116 based on the signals from the bell signal detecting units 103 and 108, and determines whether the local line 115 based on the signals from the CPC signal detecting units 105 and 110. Alternatively, it is determined whether or not a CPC signal has been received from the office line 116, and the relays 104 and 109 are driven to make the office line 115
And a DC loop formation / opening of the local line 116 is performed.

The telephone 112 is a telephone under the control of the central office 114, and is connected to the central office 114 via the central office line 113. Telephone 119, office line 1
18. The function of the central office 117 is equivalent to that of the telephone 112, central office 113, and central office 114.

FIG. 7 is a flowchart for explaining the operation of the conventional call transfer device 100 shown in FIG.

Hereinafter, the operation will be described with reference to the flowchart shown in FIG. In step 201, the bell 115
It is determined whether or not there is an incoming call. If there is no incoming call, the next step 202 is executed, and if there is an incoming call, step 203 is executed. In step 202, the bell detector 108 determines whether there is a bell incoming call on the local line 116. If there is no incoming call, the process returns to the first step 201, and the bell incoming monitoring of the local line 115 and the local line 116 is repeated. If the bell incoming is detected in step 202, the next step 204 is executed. In step 201, a bell call is detected on the line 115 in step 201, and step 20 is executed.
If you move to 3, the station line 116
It is determined whether or not the bell has arrived on the 116 side. If there is a bell incoming call on the office line 116, if both office lines (115 and 116) are captured, an incoming collision will occur, so that both office lines (115 and 116) are not captured and the process returns to step 201 to return to office line 115 and office line 116. Performs ring alert monitoring. If there is no bell call on the office line 116, the call can be captured, so the process proceeds to the next step 205, where the relays 104, 109
Is turned on, the incoming call is captured on the office line 115, and the outgoing call is captured on the office line 116. In this state, the caller receives a new line 1 from the telephone 112 via the line 113, the central office 114, the line 115, and the call transfer device 100.
It means that you can send to 16. The originating operation for the central office 117 is performed by the DTMF signal transmitted from the telephone 112 to the central office 113, central office 114, central office 115, relay 104, capacitor 106, internal communication path 120, capacitor 111, relay 10
9, via the office line 116. Here the central office 117
Is a multi-frequency selection signal (hereinafter referred to as DTMF
Signal. ) To analyze the caller's desired telephone 11
The office line to which the telephone 119 is connected so that incoming calls can be made to 9
The bell signal is sent to 118. The call is established when the callee of telephone 119 picks up the handset. The end of the call is determined by the caller of the telephone 112 or the callee of the telephone 119 returning the handset, and is connected to the call transfer device 100 from the central office (114 or 117) on the side where the handset is returned. A CPC signal is transmitted to the local line (115 or 116). Steps 206 and 207 are performed for each local line (115 or 1).
16) This is the process of detecting the CPC signal by the CPC signal detector (105 or 110). Step 20 is performed until the CPC signal is detected.
6. Repeat step 207. If a CPC signal is detected in either of these steps, the process proceeds to step 208, where the relay
104 and 109 are turned off, and the office line 115 and office line 116 are opened. Thereafter, the flow returns to step 201 to resume the bell incoming monitoring of both office lines (115 and 116).

By the way, the bell incoming monitoring of the office line 115 in the step 204 is the same as the processing in the step 203. If there is a bell incoming on the office line 115, the process returns to the step 201 to prevent the incoming collision, and the bell incoming monitoring is continued. Also, when the bell incoming call is not detected on the office line 115, the process proceeds to the step 205, the relays 104 and 109 are turned on, the incoming call is captured on the office line 116,
The station line 115 is transmitted and captured. Subsequent operations are performed by the above-described office line 115.
Can be described in the same manner as in the case where the incoming call is captured and the outgoing line is captured.

As described above, in the conventional call transfer device, a method is employed in which the DTMF signal transmitted from the caller's telephone is transmitted as it is to the call originating exchange via the called central exchange and the call transfer device. Was.

Problems to be Solved by the Invention However, in such a call transfer device, depending on the area where this device is installed, the central office on the side of originating and catching receives only a DTMF signal, or receives only a pulse signal. In that case, there is a problem that the DTMF signal can be installed only in the area of the central office which receives the DTMF signal.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides a tone signal receiving means for receiving a tone signal transmitted from a first local line, Pulse signal
And a tone signal transmitting means for transmitting a tone signal arriving at the first station line to the second station line, wherein the pulse signal transmitting means transmits the tone signal arriving at the first station line to the second station line. When a bell signal is detected, the first
Of the pulse signal transmitting means or the tone signal transmitting means, and the output of the means selected by the selecting means is output to the second terminal. And control means for controlling transmission of a signal relating to a tone signal from the first terminal to the second terminal.

Effect of the Invention According to the above configuration, when the first line is received, the first line is connected to the second line after capturing the second line, and then the first line is received. In a call transfer device for making a call to a second office line based on a tone signal sent from the office line, a central office switch of the second office line for making an outgoing call is a DT.
If the receiver receives an MF signal, by selecting the tone signal transmitting means by the selecting means, it is possible to automatically transmit the DTMF signal to the local line, and to transmit the signal. If the central office exchange of the second line receives a pulse signal, the pulse signal sending means is selected by the selecting means, so that the automatic transmission can be performed by the pulse signal to the line. I can do it.

Embodiment An embodiment of a call transfer device according to the present invention will be described below with reference to FIGS. 1, 2, 3, 4, and 5. FIG.

FIG. 1 is a block diagram of a call transfer device according to the present invention.
Is a call transfer device main body. 303 is a bell detection unit,
This section detects a bell signal transmitted from the central office exchange 314 through the central office line 315 and the capacitor 302 for DC cutoff. The detection output of the bell detection unit 303 is input to the control unit 301 and used for incoming call determination. Reference numeral 304 denotes a relay for capturing the office line 315, which is controlled by the control unit 301 and forms / opens a DC loop with respect to the office exchange 316. During capture, the DC loop is interrupted and a pulse dial signal is transmitted. 305
Is a CPC signal detection unit that detects a CPC signal transmitted from the central office exchange 314 via the office line 315 and notifies the control unit 301 of the CPC signal.
The capacitor 306 cuts off the direct current of the office line 315, and operates between the contact c between the office line 315 and the relay 320 and the resistor 321 and the contact a of the relay 211 for attenuating the speech voice band signal. It is for communication. On the other hand, a capacitor 307, a bell detector 308, a relay 309, and a CPC signal detector 310 connected to the central office 317 through the office line 316.
Are the capacitor 302, the bell detector 303, and the relay 30 respectively.
4. Performs the same function as the CPC signal detection unit 305. Also, the capacitor 311 cuts off the direct current of the station line 316, and
This is for performing only a speech voice band signal between the 20 contacts d, the resistor 321 and the contact b of the relay 322. relay
320 is connected to both ends of the resistor 321 and is connected to both local lines (315 and 3
To transmit the DTMF signal arriving from the destination line (315 or 316) during a call and between the destination line (315 or 316) between 16), short both ends of the resistor 321 to make the level of the voice band signal for the call. To prevent the decay. The relay 320 is turned off during pulse dial transmission to the originating station line (315 or 316), and the resistance 321 acts to activate the originating station line (if the station line 315 is the terminating station line, the originating station will be turned off. The line becomes the office line 316, and vice versa.) Attenuates the intermittent tone of the pulse dial signal leaking from the incoming office line (315 or 316) and coming from the incoming office line (315 or 316). DTMF signal receiver for DTMF signal
323 functions to prevent interference with signal reception. The DTMF signal receiving unit 323 is connected to the relay 322 and is switched to the contact a or the contact b under the control of the control unit 301. When the DTMF signal is connected to the contact a, the DTMF signal receiving unit 323 receives the DTMF signal coming from the local line 315, and Is connected to D
Upon receiving the TMF signal, the received data is input to control section 301. The relay 324 is interlocked with the relay 322, is switched by the control unit 301, is connected to the contact e, and is connected to the switch 325 for selecting the selection signal transmission mode at the time of capturing the transmission of the office line 316 to the DTMF signal or the pulse dial and the contact f. Similarly, office line 3
The switch 326 for selecting the selection signal transmission mode at the time of capture of the transmission of 15 to DTMF signal or pulse dial is selected.
The selection value of the switches 325 and 326 is
Is input to the control unit 301, and is used to determine the selection signal transmission mode when the station line 315 or the station line 316 is transmitted and captured. The storage unit 327 is connected to the control unit 301, and stores a buffer BF for storing the DTMF signal data received by the DTMF signal reception unit 323, and a program area storing a control program according to the flowcharts of FIGS. Table area storing PA and the conversion table shown in FIG.
Has TB. The necessity of the buffer BF inside the storage unit 327 is based on the fact that the reception DTMF signal as shown in FIG.
To convert 500 to outgoing pulse dial signal 501, use DTMF
This is to match the signal reception speed with the pulse dial signal transmission speed (for example, in the case of a pulse dial transmission speed of 10 pps, a transmission time of 1 second is required to transmit 10 pulses). In other words, the fast DTMF received
The signal data is sequentially buffered in a buffer BF in the storage unit 327, and is sequentially converted into a pulse dial signal having a low transmission speed according to the conversion table TB in FIG. Is done. Received DTMF signal 500
As shown in FIG. 4, the DTMF signal meaning "0" is converted into a 10-pulse pulse dial signal, and the DTMF signals meaning "*" and "#" are determined as no pulse transmission as shown in FIG. It is discarded without being buffered in the buffer BF.

The telephone 312 is a telephone under the control of the central office 314 and is connected to the central office 314 via a central office 313. Telephone 319, office line 3
18. The functions of the central office 317 are the same as those of the telephone 312, central office 313, and central office 314.

2 and 3 are flowcharts showing the operation of the call transfer device according to the present invention.

In step 401, the local line 315 is input by the input of the bell detecting unit 303.
It is determined whether or not there is an incoming call. If there is no incoming call, the next step 402 is executed, and if there is an incoming call, step 403 is executed. At step 402, the local line 31 is inputted by the input of the bell detecting unit 308.
It is determined in step 6 whether or not there is an incoming call. If there is no incoming call, the process returns to the first step 401 and the incoming call monitoring of the office line 315 and the office line 316 is repeated. If a bell incoming call is detected in step 402, the next step 404 is executed. Where
In the previous step 401, the bell incoming call is detected on the office line 315, and when proceeding to step 403, in order to capture the outgoing call on the office line 316 side,
It is determined whether there is a bell incoming call on the office line 316 side. Office line 3
If there is a bell incoming call at 16, if the call is captured as it is, an incoming collision between the local line 315 and the local line 316 occurs. If there is no bell incoming on the office line 316, the outgoing line 316 can be captured.
In the next step 406, the relay 322 is connected to the contact a, the DTMF signal receiving unit 323 is connected to the destination line 315, which is the destination station, the relay 324 is connected to the contact e, and the transmitting side is connected. Office line 316
Is prepared for reading information in the selection signal mode. Next, in step 407, the relay 304 is turned on, the incoming call is captured on the office line 315, the relay 309 is turned on, and the outgoing call is captured on the office line 316. Next step
At 408, information of the selection signal mode switched at step 406 is input, and if it is the DTMF mode, the next step 409
The process proceeds to step 413 in FIG. 3 if the mode is the pulse dial mode.

If the mode is the DTMF mode, the relay 320 is
Turns on, and transmits the DTMF signal arriving from the incoming call capturing side office line 315 to the outgoing capture side office line 316 without attenuating. Telephone 312
The caller sends the DTMF signal as a selection signal to the central office 317 through the central office 313, central office 314, central office 315, call transfer device 300 and central office 316, and calls the called telephone 319.
The call is established when the called party picks up the handset of telephone 319. Thereafter, in steps 410 and 411, the CPC signal of each local line (315 or 316) is monitored, and if no CPC signal is detected, step 410, step 411
Repeat 411. When the caller or called party hangs up by picking up the handset, a CPC signal is detected on either line (315 or 316) and the process proceeds to step 412, where relay 304 and relay
Turn off 309 and release both office lines (315 and 316). Thereafter, the flow returns to step 401 to monitor the incoming call at both stations (315 and 316).

In step 408, if the selection signal mode of the transmission capture station line is pulse dial in step 408, the process proceeds to step 413, the relay 320 is turned on, the resistor 321 is short-circuited, and the station line 31 is turned off.
The dial tone transmitted from the central office 317 through 6 is set to be audible on the telephone 312 of the caller. In step 414, the DTMF signal receiving section 323 determines whether or not a DTMF signal has been received, and if not, proceeds to the next step 415. In step 415 and step 416, the local station 31 as described above in step 410 and step 411.
Monitor the CPC signal of 5 and local line 316. Both steps (4
If no CPC signal is detected in steps 15 and 416), step 41
Returning to step 4, steps 414, 415, 416, etc. are repeated. If a CPC signal is detected in step 415 or step 416, the process proceeds to step 419, where relays 304 and 309 are turned off.
FF to release both office lines (315 and 316). Thereafter, the flow returns to step 401 to monitor the incoming call of both office lines (315 and 316).

When the DTMF signal is received in the previous step 414, the process proceeds to the next step 418, the relay 320 is turned off, and the incoming capture side office line 315 for transmitting a pulse dial signal to the transmission capture side office line 316. Perform mute. Next, in step 419, it is determined whether or not the reception of the DTMF signal has been completed. If the reception has been completed, the process proceeds to the next step 420, where the DTMF signal whose reception has been completed is already stored in the buffer area BF inside the storage unit 327. It is determined whether or not the data has been stored. If the data has not been written, the process proceeds to the next step 421, and the dial data of the DTMF signal for one digit that has been received is stored in the storage unit 32.
Buffer in buffer BF in 7. Then step 4
At 22, it is determined whether or not the one-digit pulse dialing transmission sequence has been completed.
The transmission dial data is read from the buffer BF in the storage unit 327 prior to the transmission of one digit of the pulse dial signal. If it is determined in step 422 that the pulse dial signal transmission sequence is currently being executed, step 42
Go directly to step 4 to continue the currently executed pulse dial signal transmission sequence. In step 424, the office line 316 is turned on and off by the relay 309 as shown in the dial pulse signal sending waveform d) to the office line 316 in FIG. 5, and the dial pulse sending sequence P and the interdigit pause sending sequence I are executed. I do. When you run some of these sequences,
The process returns from step 424 to step 419.

If it is determined in step 419 that the DTMF signal is being received, the process proceeds to step 425, where the buffer BF in the storage unit 327 is
It is determined whether or not reading of all received dial data has been completed. If dial data still exists in the buffer BF, the flow shifts to step 422 to determine whether the one-digit pulse dial transmission sequence has already been completed. It is determined whether or not it is. If it is determined in step 425 that reading of all dial data in the buffer BF in the storage unit 327 has been completed, the process proceeds to step 426 to determine whether the one-digit pulse dial transmission sequence has been completed. If the pulse dial transmission sequence is still being executed, the flow shifts to step 424 to continue the sequence. If it is determined in step 426 that the sequence has been completed, the process returns to step 413, turns on the relay 320 again, and repeats the subsequent steps 414, 415, and 416 to monitor DTMF signal reception and to monitor both stations. CPC for lines (315 and 316)
Perform monitoring.

If it is determined in step 402 that a bell incoming call is detected on the local line 316, the process proceeds to step 404, and bell incoming monitoring of the local line 315 is performed. If a bell call is detected, both lines (135 and 3)
16) Return to step 401 to continue the bell monitoring of both stations in order to prevent incoming collision at the time of capture. However, if a bell incoming call is not detected on the office line 315, the process proceeds to step 405, where the relay 322 is connected to the contact b, and the DTMF signal receiving unit 323 is connected.
Is connected to the office line 316 to prepare for the reception of the DTMF signal coming from the office line 316, and the relay 324 is connected to the contact f side to prepare for the reading of the selected signal transmission mode information of the office line 315 that has been transmitted and captured.
Next, after step 407, the description can be made in the opposite situation where the above-described office line 315 is the receiving office line and the office line 316 is the transmitting office line.

Here, the transmission pulse dial signal conversion timing chart of the received DTMF signal in FIG. 5 will be described with the incoming call capturing side office line as office line 315 and the outgoing capture side office line as office line 316.

a) shows a DTMF signal waveform on the office line 315, which shows a DTMF signal transmitted from the telephone 312 and arriving at the call transfer device 300 via the office line 313, the central office switch 314 and the office line 315. In addition, the numerical value inside represents dial information. FIG. 3B is a diagram showing a buffering state of the buffer BF in the storage unit 327, in which dial data has not yet been buffered;
This shows a state in which the MF signal is buffered in step 421 and a state in which transmission of all buffered data has been completed.
c) shows the operation of the relay 320.
Upon receiving the MF signal, the relay 320 is turned off in step 418. Thereafter, all the dial data stored in the buffer BF in the storage unit is transmitted, and the relay 320 is turned on at the timing when the pulse dial signal transmission sequence is completed and the process proceeds from step 426 to step 413. It stays ON until a signal is received. d) is a pulse dial signal transmission waveform to the office line 316. In step 421, one digit of dial data meaning "0" is read out from the buffer BF of the storage unit 327, and in step 424, sequential pulse dialing is performed. The signal transmission sequence P is executed, and then the interdigit pause transmission sequence I is executed. Subsequently, the pulse dial signal transmission sequence P and the interdigit pause transmission sequence I meaning the dial "1", and the pulse dial signal transmission sequence P and the interdigit pause transmission sequence I meaning the dial "2" have been described above. Send out in the procedure.

The present invention provides a tone signal receiving means for receiving a tone signal arriving from a first local line, a pulse signal sending means for sending a pulse signal according to the reception of the tone signal receiving means,
Selection for selecting tone signal transmitting means for transmitting a tone signal coming from the first station line, and selecting which of the pulse signal transmitting means and the tone signal transmitting means to transmit to the second station line. Means for detecting a bell signal arriving from the first station line, capturing the first station line and capturing the second station line, and selecting the pulse signal transmitting means or the tone signal transmitting means by the selecting means. A control means for outputting the output of the selected means to the second office line, so that when the first office line is received, the second office line is captured and then the first office line and the second office line are captured. A second line for making a call in a call transfer device for making a call to a second line based on a tone signal transmitted from the first line afterwards. If the central office exchange receives the DTMF signal, the selection means DTMF signal can be automatically transmitted to the station line by selecting the communication signal transmission means, and the central office exchange of the second station line for transmitting the signal transmits the pulse signal. If the signal is to be received, by selecting the pulse signal sending means by the selecting means, it becomes possible to automatically send a pulse signal to this station line. The transmission of the dial signal for the automatic transmission according to the request can be performed.

[Brief description of the drawings]

1 is a block diagram of a call transfer device according to the present invention, FIGS. 2 and 3 are flowcharts showing processing in the call transfer device according to the present invention, and FIG. 4 is for converting a received DTMF signal into a transmission pulse dial signal. FIG. 5 shows a table of FIG.
FIG. 1 is a timing chart for converting a received DTMF signal into a transmission pulse dial signal, FIG. 6 is a block diagram of a conventional call transfer device, and FIG. 7 is a flowchart showing processing in the conventional call transfer device. 112,312 Telephone 113,313 Telephone line 115,315 Telephone line 116,316 Telephone line 118,318 Telephone line 119,319 Telephone 120,320 Telephone line

Claims (1)

(57) [Claims] A first terminal and a second terminal connected to different office lines, a bell signal detecting means for detecting a bell signal arriving at the first terminal, and a connection to the first terminal. First capturing means for capturing the received office line, second capturing means for capturing the office line connected to the second terminal, and a tone for receiving a tone signal sent from the first terminal Signal receiving means; pulse signal sending means for sending a pulse signal corresponding to the reception of the tone signal receiving means to a second terminal; and transmitting the tone signal arriving at the first terminal to a second terminal. Tone signal transmitting means for selecting the output of the pulse signal transmitting means and the tone signal transmitting means to be transmitted to the second terminal; and Bell arriving at the terminal Detecting, the first capturing means captures the office line connected to the first terminal, and the second capturing means captures the office line connected to the second terminal. By outputting the output of the means selected by the selecting means of the pulse signal sending means or the tone signal transmitting means to the second terminal, a signal relating to the tone signal from the first terminal is sent to the second terminal. A call transfer device, comprising: control means for controlling transmission.