JPH02100551A - Call transfer equipment - Google Patents

Abstract

PURPOSE:To obtain the call transfer equipment of high number of degrees of freedom by discriminating the receiving type of a selection signal in a local exchange which is previously set, transmitting an arriving DTMF signal as the signal as it is and transmitting it by means of converting it into a pulse dial signal when an originating side trunk line is captured. CONSTITUTION:When bell incoming is detected in a trunk line 315, and there is no bell incoming in a trunk line 316, a relay 322 is connected to a contact point a-side, a DTMF signal reception part 323 to a trunk line 315-side, a relay 324 to a contact point (e)-side and the reading of information on the selection signal mode of the origination side trunk line 316 is prepared. Next, a relay 304 is turned ON, the trunk line 315 is incoming-captured, a relay 309 is turned ON and the trunk line 316 is incoming-captured. At the time of a DTMF mode, a relay 320 is turned ON and the arriving DTMF signal is transmitted to the incoming-capture side trunk line 316 without attenuating the arriving DTMF signal. At the time of a pulse dial, the relay 320 is turned ON, a resistance 321 is shorted, and a dial tone transmitted from a local exchange 316 through the trunk line 316 is set in a state that it can be heard in the telephone set 312 of a caller.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to the case where an incoming call is received from one central office line connected to a device, the incoming call is captured on that central office line, and the incoming call is captured on the other central office line connected to the device in the same way. The present invention relates to a call transfer device that captures a call and selects a party to call to a central office exchange on the call capture side.

2. Description of the Related Art A conventional call transfer device is shown in FIG. Reference numeral 100 is a block diagram of a call transfer device, which is composed of the parts described below.

Reference numeral 103 denotes a bell detection section, which detects a bell signal sent from the central office exchange 114 through the central office, M+115, and the capacitor 102 for cutting off DC current. The detection output of the bell detection section 103 is input to the control section 101 and used for determining incoming call. 104 is a relay for supplementing the central office line 115, which is controlled by the control unit 101 and is connected to the central office exchange 114.
A DC loop is formed/opened to indicate the intention to make a call, respond, or end a call. 105 detects a momentary interruption of the DC loop current (hereinafter, this instantaneous interruption of the DC loop current is referred to as a CPC signal), which indicates the end of the call, sent from the central office exchange 114 through the central office line 115, and notifies the control unit 101. CP to
This is a C signal detection section. The capacitor 106 is used to cut off direct current from the office line 115 and transmit only the voice band signal to the internal communication path 120. On the other hand, central line 11
6 connected to the capacitor 107, the bell detection section 108,
Relay 109, CPC signal detection section 110. capacitor 1
11 are a capacitor 102 and a bell detection unit 103, respectively.
, relay 104, CPC signal detection section 105, and capacitor 106.

Internal communication path 120 connects capacitor 106 and capacitor 1.
11, and performs signal connection in the speech voice band between the office line 115 and the office line 116. The control unit 101 detects the central office line 11 based on the signals from the bell signal detection units 103 and 108.
5 or station line 116, and based on the signals from CPC signal detection units 105 and 110, it is determined whether or not a CPC signal has been received from station line 115 or station v1116. 104 and 109 are driven to form/open a DC loop of the central line 115 and the central line 116.

The telephone 112 is a telephone under the control of the central office exchange 114 and is connected to the central office exchange 114 via a central office line 113. The functions of the telephone 119, the central office line 118, and the central office exchange 117 are the same as those of the telephone 112, the central office line 113, and the central office exchange 114.

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

The operation will be explained below using the flowchart shown in FIG. In step 201, the bell detection unit 103 determines whether or not there is an incoming bell call on the central office line 115. If there is no incoming call, the next step 202 is executed; if there is, step 2 is executed.
Execute 03. In step 202, the bell detection unit 108
It is determined whether or not there is an incoming bell call on the office line 116, and if there is no incoming call, the process returns to the first step 201 and returns to the office line 11.
5 and repeats the monitoring of incoming bell calls on the central office line 116. Further, when an incoming call is detected in step 202, the next step 204 is executed. However, if an incoming call is detected on the office line 115 in step 201 and the process moves to step 203, in order to capture the call on the office line 116 side,
(Determines whether or not there is an incoming bell call on 1111. If there is an incoming bell call on the office line 116, both office lines (115 and 11
6), an incoming call collision will occur, so both station lines (115
and 116) and returns to step 201 to obtain the station line 11.
5 and central office line 116. If there is no incoming bell call on the central office line 116, since the call can be captured, the process moves to the next step 205, where relays 104 and 109 are turned on.
Incoming calls are captured on the office line 115, and outgoing calls are captured on the office line 116.

This state means that the calling party can make a new call to the central office line 116 from the telephone 112 via the central office line 113, central office exchange 114, central office line 115, and call transfer device 100.

A call operation to the central office exchange 117 is performed via the central office line 113 and the central office exchange 11 using a DTMF signal sent from the telephone 112.
4. The communication is carried out via the office line 115, the relay 104, the capacitor 106, the internal communication path 120, the capacitor 111, the relay 109, and the office line 116.

Here, the central office exchange 117 receives a multi-frequency selection signal (hereinafter referred to as DTMF signal) transmitted from the telephone 112.

) and sends a bell signal to the station n118 to which the telephone 119 is connected in order to have the call arrive at the telephone 119 desired by the caller. The call is confirmed when the called party on telephone 119 picks up the receiver. The end of the call is confirmed when the calling party on telephone 112 or the called party on telephone 119 puts the receiver back on, and the call transfer device 100 is connected to the central office exchange (114 or 117) on the side that put the receiver back on. Ru station &? + C for (115 or 116)
A PC signal is sent out. Step 206 and Step 2
07 is the CPC of each station line (115 or 116)
This is a process in which a signal is detected by a CPC signal detection unit (105 or 110), and steps 206 and 207 are repeated until a CPC signal is detected. If a CPC signal is detected in either of these steps, the process moves to step 208, and relays 104 and 109 are set to 0FFL, station line 115 and station line 11.
Open 6. After that, the process returns to step 201, and both station lines (
115 and 116) resumes monitoring of incoming calls.

By the way, the monitoring of incoming bell calls on the office line 115 in step 204 is the same as the process in step 203, and if there is an incoming bell call on the office line 115, the process returns to step 201 to continue monitoring the incoming bell calls in order to prevent call collision. If no incoming call is detected on the central office line 115, the process goes to step 205 and relays 104 and 109 are turned off.
Nt, the incoming call is captured on the office line 116, and the outgoing call is captured on the office line 115.

The subsequent operation is to capture the incoming call on the above-mentioned central office line 115 and transfer the incoming call to central office line 1.
16 can be similarly explained from the opposite standpoint.

As explained above, conventional call transfer devices employ a method in which the DTMF signal transmitted from the caller's telephone is directly transmitted to the originating exchange via the destination exchange and the call transfer device. Ta.

Problems to be Solved by the Invention However, with such a call transfer device, depending on the area where this device is installed, the central office exchange on the side that captured the call may be DTMF.
If the device accepts only signals or only pulse signals, there is a problem that it can only be installed in areas where central exchanges accept DTMF signals.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a method in which the originating captured station line selects a DTMF signal according to the receiving selection signal type of the originating side exchange set in advance as information on the originating captured station line. If it is a central office line that receives pulse dialing as a signal, the DTMF signal sent from the telephone on the called station line will be transmitted as is to the originating and capturing station line, and if the originating and capturing station line is a station line that receives pulse dialing as a selection signal, For example, a signal receiving means receives a DTMF signal sent from a telephone on the receiving side's office line, stores the data of the received DTMF signal, and converts it into a pulse dial signal based on the stored data and sends it out. It was configured as follows.

Effect With the above configuration, the central office exchange of the originating and capturing side line is DTMF.
Whether the signal is to be received as a selection signal or a pulse signal is to be received as a selection signal, by setting information to that effect in advance, the signal will be sent in a mode suitable for the area. do.

Embodiments Hereinafter, embodiments of the call transfer device according to the present invention will be described using FIGS. 1, 2, 3, 4, and 5.

FIG. 1 is a block diagram of a call transfer device according to the present invention.
is the main body of the call transfer device. 303 is a bell detection unit which detects the bell signal sent from the central office exchange 314 through the central office line 315.
and a part that detects through a capacitor 302 for cutting off DC current. The detection output of this bell detection section 303 is input to the control section 301 and used for determining incoming call. 304 is a relay for capturing the central office line 315, which is controlled by the control unit 301, forms/opens a DC loop with the central office exchange 316, indicates the intention to respond to a call or end a call, and transmits the central office line. During capture, the DC loop is interrupted and a pulse dial signal is sent out. A CPC signal detection unit 305 detects a CPC signal sent from the central office exchange 314 through the central office line 315 and notifies the control unit 301 of the detected CPC signal. The capacitor 306 cuts off the direct current of the office line 315, and connects the office line 315, the contact C of the relay 320, and the resistor 321, which functions to attenuate the call voice band signal, and the contact a of the relay 322, so that only the call voice band signal is transmitted. It is for communicating. On the other hand, a capacitor 307, a bell detection section 308, and a relay 30 are connected to a central office exchange 317 through a central office line 316.
9. The CPC signal detection unit 310 each has a capacitor 3
02, performs the same function as the bell detection section 303, relay 304, and CPC signal detection section 305. Also, capacitor 311
cuts off the direct current of the central line 316 and connects the central line 316 and relay 3.
This is for transmitting only voice band signals for communication between the contact d1 resistor 321 of 20 and the contact 322 of the relay 322. The relay 320 is connected to both ends of the resistor 321, and transfers the DTMF signal arriving from the receiving side office line (315 or 316) to the originating side office line (316 or 315) during a call between the two office lines (315 and 316). When transmitting to , resistor 32
1 to prevent attenuation of the voice band signal level. In addition, the relay 320 connects the originating station line (315
or 316) during pulse dial transmission, and by the action of the resistor 321, the calling side office line (if the calling side office line 315 is the receiving side office line, the calling side office line becomes the office line 316, and vice versa). ) to reduce the intermittent sound of the pulse dial signal leaking to the receiving side office line (315 or 316),
DTMF arriving from the receiving side office line (315 or 316)
It functions to prevent interference with signal reception by the DTMF signal receiving section 323. The DTMF signal receiving section 323 is connected to the relay 322, and the contact a is controlled by the control section 301.
Or, if it is switched to contact A and connected to contact a, it will receive the DTMF signal coming from the office line 315, and if it is connected to contact A, it will receive the DTMF signal coming from the office line 316.
A signal is received, and the received data is input to the control section 301.

The relay 324 works in conjunction with the relay 322 to control the control unit 301.
A switch 325 is connected to the contact e and selects a selection signal when the central office line 316 is captured.The switch 325 selects the sending mode to DTMF signal or pulse dial. The switch 326 is selected to select the transmission mode as DTMF signal or pulse dial. The selected values of the switches 325 and 326 are passed through the relay 323 to the control unit 30.
1 and is used to determine the selected signal transmission mode when the station line 315 or 316 is transmitted and captured. The storage unit 327 is connected to the control unit 301 and stores a buffer BF for storing DTMF signal data received by the DTMF signal reception unit 323, and a control program according to flowchart I in FIGS. 2 and 3. It has a program area PA1 and a table area TB in which the conversion table shown in FIG. 4 is written 1:α. The necessity of the buffer BF inside the storage unit 327 is such that when the originating and capturing side office line (315 or 316) is in the pulse dial transmission mode,
As shown in FIG. 4, when converting the received DTMF signal 500 to the transmitted pulse dial signal 501, the reception speed of the DTMF signal and the transmission speed of the pulse dial signal (for example, 10
In the case of a pulse dial sending speed of pps, sending out 10 pulses requires a sending time of 1 second. ) to ensure consistency. In other words, the received DT is faster.
The MF signal data is buffered one after another in the buffer BF in the storage unit 327, and is sequentially converted to the conversion table T shown in FIG.
According to B, the signal is converted into a pulse dial signal with a slow transmission speed, and is sent to the originating and acquiring side office line (315 or 316). The rules for converting the received DTMF signal 500 to the transmitted pulse dial signal are as shown in FIG. 4. A DTMF signal meaning 0 is converted to a 10 pulse pulse dial signal,
The DTMF signal meaning # is discarded without being buffered in the buffer BF in the storage unit 327 as no pulse is sent.

The telephone 312 is a telephone under the control of the central office exchange 314 and is connected to the central office exchange 314 via a central office line 313. The functions of the telephone 319, the central office line 318, and the central office exchange 317 are the same as those of the telephone 312, the central office line 313, and the central office exchange 314.

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

In step 401, it is determined whether or not there is an incoming bell call on the central office line 315 based on the input from the bell detection unit 303. If there is no incoming call, the next step 402 is executed, and if there is, step 4 is performed.
Execute 03. In step 402, the bell detection unit: 30
8, it is determined whether or not there is an incoming call on the office line 316. If there is no incoming call, the process returns to the first step 401 and the monitoring of incoming bell calls on the office line 315 and 316 is repeated. or,
If an incoming call is detected in step 402, the next step 404 is executed. Now, step 40
At step 1, an incoming call is detected on the central office line 315, and the process proceeds to step 403.
In order to capture the call on the central office line 316 side, it is determined whether or not there is an incoming call on the central office line 316 side. Central line 3
If there is an incoming bell call on 16, if you catch it as it is, it will become central line 31.
5 and the central office line 316, step 401 occurs.
Returning to step 3, the system monitors incoming bell calls on the office line 315 and the office line 316.

If there is no incoming bell call on the office line 316, since the office line 316 can be captured, the process moves to the next step 406, where the relay 322 is connected to the contact a side, and the DTMF signal receiving section 323
is connected to the receiving side station line 315 side, and the relay 32
4 is connected to the contact e side, and preparations are made to read information on the selected signal mode of the calling side station line 316. Next, in step 407, the relay 304 is set to ONI, the office line 315 is set to receive an incoming call, and the relay 309 is set to ONL, and the office line 316 is set to receive an outgoing call. Next, in step 408, information on the selected signal mode switched in step 406 is inputted, and if it is the DTMF mode, the process moves to the next step 409, and if it is the pulse dial mode, the process moves to step 413 in FIG. 3.

If the mode is DTMF mode, the relay 320 is set ONL in step 409, and the D coming from the incoming call capture side line 315 is
The TMF signal is not attenuated (transmitted to the originating and capturing side's office line 316. The calling party of the telephone 312 uses the DTMF signal as a selection signal and transmits it to the office line 313, the central office exchange 314, and the central office line 315.
, the call is sent to the central office exchange 317 through the call transfer device 300 and the central office line 316, and the called telephone 319 is called. 1st
1ζ is established when the called party picks up the receiver of the telephone set 319. Then, step 410 and step 4
At step 11, the CPC signal of each office line (315 or 316) is monitored, and if no CPC signal is detected, steps 4101 and 411 are repeated. When the calling party or the called party hangs up the telephone, a CPC signal is detected on either station line (315 or 316), the process moves to step 412, and relays 304 and 309 are turned off.
and open both station lines (315 and 3]6). Thereafter, the process returns to step 401 to monitor incoming bell calls on both office lines (315 and 316).

If it is determined in step 408 that the selected signal mode of the originating and captured station line is pulse dial, the process moves to step 413, where the relay 320 is ONL, the resistor 321 is shorted, and the signal is sent from the central office exchange 317 through the central office line 316. The caller's telephone 312 is set to allow the dial tone to be heard.

In step 414, L') TMF signal receiving section 32
In step 3, it is determined whether or not a DTMF signal is being received, and if not, the process moves to the next step 415.

In step 415 and step 416, step 410
Then, in step 411, the CPC signals of the office line 315 and the office line 316 are monitored as described above. If no CPC signal is detected in both steps (415 and 416), the process returns to step 414 and steps 414 and 41
5. Repeat step 416. Also step 415
Or, if a CPC signal is detected in step 416, the process moves to step 419, and relays 304 and 309 are set to 0FFL,
Both office lines (315 and 316) are opened. Thereafter, the process returns to step 401, and incoming calls on both office lines (315 and 316) are monitored.

When the DTMF signal is received in the previous step 414, the process moves to the next step 418 and the relay 320 is set to 0FF.
t. The incoming captured side office line 315 is muted in order to send a pulse dial signal to the originating captured side office line 316. Next, in step 419, it is determined whether or not the DTMF signal reception has ended. If the reception has ended, the process moves to the next step 420, and the DTMF signal reception has ended.
It is determined whether the signal has already been stored in the buffer area BF inside the storage unit 327, and if it has not been written yet, the process moves to the next step 421, and the dial data of the 1-digit DTMF signal that has been received is stored. It is buffered in the buffer BF in the storage unit 327. Next step 42
In step 2, it is determined whether the pulse dial sending sequence for one digit has been completed, and if it has been completed, step 42
3, the transmission dial data is read from the buffer BF in the storage section 327 prior to the transmission of the one-digit pulse dial signal. Further, if it is determined in step 422 that the pulse dial signal sending sequence is currently being executed, the process proceeds directly to step 424, and the currently executing pulse dial signal sending sequence is continued. In step 424, the relay 309 turns the office line 316 ON and OFF as shown in the dial pulse signal transmission waveform d) to the office line 316 in FIG.
F, and execute dial pulse sending sequence P and interdigit Bose sending sequence I.

Upon execution of some of these sequences, step 424
If it is removed, the process returns to step 419.

By the way, if the DTMF signal is still being received in step 419, the process moves to step 425, where it is determined whether reading of all received dial data from the buffer BF in the storage section 327 has been completed, and if there are still dials in the buffer BF. If the data exists, proceed to step 422;
It is determined whether the pulse dial sending sequence for one digit has already been completed. If it is determined in step 425 that all dial data in the buffer BI" in the storage section 327 has been read out, the process proceeds to step 426, where it is determined whether or not the pulse dial sending sequence for one digit has been completed. If it is determined that the pulse dial sending sequence is being executed, the process moves to step 424 and continues the sequence.If it is determined in step 426 that the sequence has ended, then step 4 is performed.
13, turn on the relay 320 again, repeat steps 414, 415 and 416,
DTMF signal reception monitoring and both station lines (315 and 316)
Performs CPC monitoring.

If the incoming call on the office line 316 is detected in step 402, the process moves to step 404, and the incoming call on the office line 315 is monitored. If an incoming call is detected, the process returns to step 401 to continue monitoring the health of both office lines (315 and 316) in order to prevent incoming calls from colliding when both office lines (315 and 316) are captured.

However, if no incoming bell call is detected on the office line 315, the process moves to step 405, where the relay 322 is connected to the contact side, the DTMF signal receiving section 323 is connected to the office line 316 side, and the In preparation for receiving the incoming DTMF signal, the relay 324 is connected to the contact 1 can II in preparation for reading the selected signal sending mode information of the station n315 that has been captured.

From the next step 407 onwards, it is possible to explain from the opposite standpoint of the case where the office line 315 described above is the receiving side office line and the office line 316 is the originating side office line.

Here, the timing chart for converting the sending pulse dial signal of the received DTMF signal in FIG. 5 will be explained assuming that the incoming call capturing side office line is the office line 315 and the originating capturing side office line is the office line 316.

a) is the DTMF signal waveform on the office line 315, which is transmitted from the telephone 312 and sent to the office line 313, the office exchange 314, and the office line 3.
DTM arriving at the call transfer device 300 via 15
F signal is shown. Note that the internal numbers represent dial information. b) is a diagram showing the buffering status of the buffer BF in the storage unit 327, in which the dial data is not yet buffered, the DTMF signal is buffered in step 421, and all buffered data has been sent out. Indicates the state of C) is relay-3
20 operation, is turned ON in step 413, and the DTMF
When the signal is received, relay 320 is turned off in step 418.
F. Thereafter, when all the dial data stored in the buffer BF in the storage unit is sent out and the pulse dial signal sending sequence is completed, the relay 320
turns on and remains on until the DTM F signal is received in step 414. ci) is a pulse dial signal transmission waveform to the office line 316, and in step 421, it is sent from the buffer BF of the section 1.alpha.
One digit worth of dial data meaning "0" is read out, and in step 424, a pulse dial signal transmission sequence P is sequentially executed, followed by an interdigital Bose transmission sequence I. Next, pulse dial signal transmission sequence P and interdigital Bose transmission sequence 11, which means dial "1", followed by pulse dial signal transmission sequence P, which means dial "2", and interdigital Bose transmission sequence I, as described above. Send with . Effects of the Invention The present invention distinguishes the type (DTMF signal or pulse dial signal) of the preset selection signal reception of the central office exchange when capturing the originating station line, and determines the type of signal received from the receiving station line. By sending the DTMF signal as it is to the originating and capturing side office line, or by converting it into a pulse dial signal and sending it, the reception selection signal of the central office exchange, which differs depending on the installation location of this call transfer device, can be changed. It is possible to provide a call transfer device with a high degree of freedom independent of modes.

[Brief explanation of the drawing]

FIG. 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. A diagram showing a table of
Fig. 5 shows a timing diagram of JJ and S combinations that convert received DTMF signals into outgoing pulse dial signals, Fig. 6 is a block diagram of a conventional call transfer device, and Fig. 7 shows processing in a conventional call transfer device. FIG. 15゜16゜18゜20゜

Claims (1)

[Scope of Claims] Signal receiving means for receiving a multi-frequency selection signal arriving from a first terminal, and transmitting a pulse signal to the second terminal or receiving a multi-frequency selection signal arriving from the first terminal. transmission mode setting means for setting whether to transmit a pulse signal; pulse generation means for generating a pulse signal based on data included in the multi-frequency selection signal received by the signal receiving means; a sending means for sending out to the second terminal; and a sending means for sending out either the pulse signal generated by the pulse generating means or the multi-frequency selection signal arriving from the first terminal according to the sending mode set by the sending mode setting means. A call transfer device comprising: a control means for transmitting data to a second terminal.