JPH03195162A - Redial system for exchange of additional number dial-in call incoming - Google Patents

Abstract

PURPOSE:To make a call incoming to another extension even when the caller of a line cuts a call and does not retransmit the call by transiting a state to a figure receiving state again by dialing a specified figure from the line when a call incoming line and the extension are disconnected by erroneous dialing during the extension call. CONSTITUTION:In an exchange processing control part 10, an additional dial number connection processing part 11, specified figure reception detecting means 12, figure information clear means 13 and signal tone/tokey connection instructing means 14 are provided. When an additional number is received and the connection to the extension corresponding to the additional number can not be executed by a busy state or erroneous dialing, etc., after the call is incoming from the line, the information of the received additional number are reset by detecting the specified figure information sent out from the transmission side and the connection to the other extension is enabled by receiving the other additional number from the transmission side. Thus, when a called party can not be connected by the busy state or the erroneous dialing, the other additional number dial is inputted again and the other extension is connected without disconnecting the line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] This invention relates to an additional number dial-in terminating exchange that performs connection processing to a called extension based on numeric information sent from the caller after receiving a call from a public line to the exchange.

The purpose of this invention is to provide a redialing method that allows connection to another extension by re-entering an additional number different from the original number without disconnecting the line when the other party cannot be connected due to a busy call or incorrect number dialing.

The exchange processing control unit includes a specific digit reception detecting means for detecting that specific digits are received from the line with a signal tone or talkie connected to the line due to busy or incorrect dialing of the called extension; A numeric information clearing means that is activated by the detection output of the detection means and clears the numeric information of the additional number that has already been received, and a signal tone/talkie connection that connects a dial tone or talkie to one line and sets the number receiving state. and an instruction means, and is configured to connect to the called extension by re-dialing from the calling side.

[Field of Industrial Application] The present invention relates to an exchange using an additional number dial-in service, which processes a connection to a called extension based on numerical information sent from a caller after receiving a call from a public line to an exchange.

In recent years, various central office line terminating services have come to be provided at private exchanges (PBXs) in response to user requests. Among these, with the additional number dial-in service, after receiving a call from one central office line, the exchange returns a response to the central office line, receives the dial from the first caller, and calls the called extension of that number. If you want to receive a call to an extension other than one that can be shifted, or if the connection is busy due to an incorrect dialing, etc., the caller must terminate the connection, then call again to a different extension number. This has the inconvenience of having to dial the number and being charged again. It is desired to call another extension without disconnecting the call.

[Prior Art] FIG. 4 is a connection system diagram of a conventional example, and FIG. 5 is a processing flow diagram of additional number dial-in of a conventional example.

In Figure 4, 41 is public! ll telephone network, 42 is a central office line, 43 is a PBX exchange, and 44 is a network.

45 represents an exchange processing control section.

To explain the operation of the additional number dial-in service, a call is made from the telephone 4o of the public telephone network 41, and a telephone number for calling the exchange 43 is dialed. For example, ○O○-
When you dial the main number ×××−△ΔΔ△, it is public telephone network 41. The call arrives at the network 44 of the exchange 43 via the route of the central office line 42° line control unit 46. Here, when the switching processing control section 45 detects an incoming call by the line control section 46 of the exchange 43, it instructs the single line control section 46 to respond to the central office line 42. At the same time, the exchange processing control unit 45 connects a sound source, ie, a talkie or dial tone (dial tone) 49, to the incoming line, and notifies the user of the 9-calling type talking device 40 to dial an additional number. . At this time, control is also performed to connect a PB (push phase signal) receiver 47 to this line in order to receive the additional number. As a result, the exchange processing control unit 45 of the exchange 43 enters a digit reception state.

The processing flow in the exchange processing control unit from this digit reception state is shown in FIG. 5, and will be described below with reference to the flow in FIG. 5.

That is, during the reception of numbers in step 51.

Call 4 by listening to the above talkie or dial tone! ! 40
When a user of
Dial the number 21" and the PB receiver 47
When this is detected and the beginning of the dial is detected, the talkie or dial tone (DT) 49 is removed from the line. It is determined whether or not the number of digits received by the PB receiver 47 has reached the number of extension digits (four digits in this example).
Step 52), if it is equal to the number of extension digits, the number is set to a state in which digits cannot be received (the connection between the PB receiver and the line is disconnected) (Step 53). If the number of extension digits is not reached, the process returns to numeric receipt B (step 51).

In step 54, the received digit is analyzed to identify whether it is an extension number of this exchange; if it is an extension number;

Determine whether or not it is possible to receive calls to the corresponding extension (busy, incoming call restriction, etc.) (step 55) #
If the received digits do not correspond to the extension number or if the call cannot be received due to connection restrictions, the connection between the PB receiver 47 and the line is released (step 61), and the line is further released and the user of the calling telephone 40 is sent to the public telephone network 41. A busy tone is heard, or a talkie connection is made to the line (an announcement that there is no corresponding extension, etc.) (step 62).

If the corresponding extension exists on the exchange and two calls can be received,
The PB receiver 47 is released (step 56), and a paging connection (a connection for sending a paging signal to the destination and a ringing tone to one caller) is performed (step 57). In addition, in this additional number dial-in service, in step 55, a telephone corresponding to the additional number (in this example, 1 number "332
When B) cannot be connected due to a busy situation, etc., a control operation is performed to automatically perform a reset shift type operation.

This reset-shift method involves dialing again the last digit (l'°) of the telephone extension number originally dialed by the calling subscriber, in this example "3321". This is a method to change the number to one number (one from 0 to 9) and execute the connection operation again.
This allows incoming calls to be changed to a telephone near the original extension telephone.

That is, in step 55 of FIG. 5, when the designated extension is busy and cannot receive a call, the process moves to step 58, and first the received digit ("3321") in the numeric receiving area secured in the memory in the exchange control unit is read. Clear the last digit by one digit (in this case, clear "1" to become "332").Next, in step 59, subtract 1 from the number of received digits (make the number of received digits 3).Further step At step 60, the control state of the exchange processing control section is set to a state in which numbers can be received.

Return to step 51 again.

When returning from step 60 to step 51, a reset shift tone (indicated by R3FT) is output from the sound source 4 to inform the caller that there is a
I'll let you know from 9. When the caller dials a single digit in this state, the PB receiver 47 receives the number. Then, in the case of number reception while listening to the reset shift sound, the number of received digits is incremented by 1 to become "4'," the received number is added to the end of the number reception area, and the number reception state (step 51), the control is transferred to the path 510 in the figure, and a state is made in which numbers cannot be received (step 53).

For example, if a caller dials °'2n, the extension number will be "3322" in the above example. Thereafter, through the processes in steps 54 and 55, two calls are received if it is possible to receive a call on the shifted partner's extension.

If you cannot receive a call because the other party's extension is busy, you can also perform a reset shift.

The above reset shift operation when the other party's extension line is busy is
The line incoming to exchange 43 in the figure is connected to another exchange (PBX).
), etc., the same processing is carried out in the case of a trunk line from an exchange. In other words, ? )! When a private exchange network is constructed using old exchanges, connection is established by dialing the telephone number specifying each exchange and the extension number within each exchange.

In such a switching system, when a caller on one switch dials a number that identifies the other switch, a corresponding trunk line to the other switch FIAIm is captured and the call is terminated at the other switch. Thereafter, one caller dials the extension number of the other exchange to be connected to the extension of the other exchange.

The reset shift connection control in this case is performed in the same way as the reset shift method of dialing in an additional number after receiving a call using the above-mentioned central office line. However, in that case, the PB receiver is used only when the signal from the trunk line is in the PB signaling system. Note that, unlike the additional number dial-in incoming call method, the trunk line incoming call does not return a response to the first line when one incoming call is detected, but returns a response when nine incoming extensions respond.

[Problem to be Solved by the Invention 1] As described above, in the conventional additional number dial-in service, when the other party is busy, an adjacent telephone can be called using the reset shift method.

However, if connection is not possible due to the other party's call or connection restrictions, etc., there may be cases where it is desired to connect to another telephone (an extension other than the extension number that can be reset-shifted). In that case, it is necessary to temporarily disconnect the connection via the public line and make the call again. Similarly.

If you make a mistake when dialing an additional number, you must disconnect from the public line and call again. is returned, so 2
Call fees are charged, and if you make a re-call, not only will you be charged an additional fee, but you will also have to dial the phone number all over again to establish a connection via the public line.

Therefore, if you cannot connect to the other party because the other party is busy or dialed the wrong number as mentioned above, the line will be disconnected and then tried again, so in addition to the problem of being charged each time, you will also have to make another call. The user had to perform a series of operations to dial the destination, which caused problems in serviceability and operability.

In addition, even when connecting via the conventional trunk line described above, reset shift is allowed when the other party is busy, but you want the call to arrive at an extension other than the one that can be reset shifted, or when you dial the wrong extension number. .

I had to call and dial again.

The present invention allows an additional number dial-in exchange to connect to another extension by re-entering an additional number different from the original number without disconnecting the line when a call is in progress or a connection cannot be made due to dialing an incorrect number. The purpose is to provide a redial method. In connection with this, another object of the present invention is to provide a redialing method when a call arrives on a trunk line.

[Means to solve the problem] FIG. 1 is a diagram showing the principle configuration of the present invention.

In FIG. 1, 10 is an exchange processing control section, 11 is an additional number dial connection processing section, 12 is a specific number reception detection means,
13 is a numerical information clearing means, 14 is a signal tone/talkie connection instruction means, and 15 is a memory.

The present invention provides a system in which when an additional number is received after an incoming call is received from a telephone line, and connection to the extension corresponding to the additional number is not possible due to a busy call or incorrect dialing, 1. ) When the information is detected, the received additional number information is reset (cleared). 1. It is possible to receive another additional number from the calling side, thereby making it possible to connect to another extension.

[Function] FIG. 1 shows a basic configuration centered on nine of the switching processing control sections that perform the connection processing of each section including the switching network, which are provided according to the present invention.

When a call is received from a line such as a central office line from the public telephone network, the additional number dial connection processing section 11 of the exchange processing control section 10 is activated. The additional number dial connection processing unit 11 receives the additional number dial as in the conventional example, stores the numerical information in the memory 15, analyzes the numerical information (extension number), and connects according to the status of the corresponding extension. Execute processing.

When the extension is busy or cannot be connected (for example, when the received additional number is incorrect and the corresponding extension does not exist), an instruction to connect a signal tone or talkie to the line is output to the network.

When predetermined specific digits (including symbols) are sent from the caller's telephone while this signal tone or talkie is being output to the line, the specific digit reception detection means 12 detects and outputs occurs. When this detection output is given to the numerical information clearing means 13, it is activated and clears the numerical information (received additional number) stored in the memory 15.

In parallel with the clearing operation of the numerical information clearing means 13, the signal tone/talkie connection instructing means 14 is activated to give an instruction to the network to connect the signal tone or talkie to the line.

The state in which this signal tone or talkie is connected to the line is the same as the state in which one line first arrives at the exchange, and the additional number of another extension can be dialed again from the calling party's telephone. Connection processing is performed in the additional number dial connection processing section 11 according to the additional number received by re-dialing.

[Embodiment] FIG. 2 is a block diagram of an exchange in which the present invention is implemented, and FIG. 3 is a processing flow diagram of the embodiment.

In the configuration shown in FIG. 2, 20 is a network of exchanges;
21 is a line control unit that connects to the central office line from the public telephone network;
2 is a line control unit that connects to a trunk line from another exchange;
3 is an exchange processing control unit, 24 is a memory, 25 is a PB receiver, 26-1 is a dial tone (DT), 26-2 is a reset shift tone (R3FT), and 27-1 is a talkie.
27-2 represents talkie-B and generates the message ``This is OO, please dial the extension number.'' 27-2 represents talkie-B.
Contents for notifying dead level and dead number talkie 1 For example, a message such as "The number you have called is currently not in use" is generated, and 28 and 29 each represent an extension telephone.

The operation in FIG. 2 will be explained.

Let me explain what happens when a call arrives on the central office line for the first time.

When a call arrives at the line control unit 21 from the central office line, a dial tone (DT) 26-
1 or Talkie A, 27-1 is connected, and when an additional number dial is received in response, the numeric information is stored in the received digit area 242 of the call information block 241 of the memory 24. The received number at this time is '4321''.

Therefore, the number of received digits 243 is "4".

The exchange processing control unit 23 processes the extension call based on the received digits, but if the corresponding extension is busy or there is no corresponding extension (in the case of incorrect dialing), it controls the network and performs a reset shift. Sound 26-2 or talkie
Connect B and 27-2 and send out to 5 lines.

At this time, when the second caller dials a predetermined reset dial special number (in this example, the push button dial number "#" using a two-frequency signal), the PB receiver 25
Receive at. The exchange processing control unit 23 analyzes this received digit, and if it detects that it is a reset dial special number, it clears the received digit area 242 of the call information block 241 and sends the line and dial tone 26-1 via the network 20. Or connect Talkie-A, 27-1.

do. As a result, when the numeric information is received again from the 0 line (° "4567") which causes a transition from the reset shift sound 26-2 or talkie-B 27-2 sending state to the numeric receiving state, the exchange processing control unit 23 The incoming extension is determined based on the number, and the process of calling the corresponding extension is performed.

If a number (0 to 9) other than "#" is received while the above-mentioned reset shift sound 26-2 is being sent to the line, a reset shift can be performed as in the conventional example.

The processing flow in the exchange processing fee jn section for carrying out the above control will be explained with reference to FIG.

300 in Figure 3 indicates that the exchange processing control unit (23 in Figure 2) is receiving digits, and there is an incoming call from 1 line and 5 dial tones (
DT) 26-1 or Cent Shift Tone (R3FT)
) 26-2 or Talkie-A 27-1 is connected to the line and the PB receiver 25 is connected at the same time, an additional number (extension number) is received from 9 lines (assuming the extension number is 4 digits, 4 When a digit number is received), the process moves to step 301, and the DT, R3FT, or Talkie-A that was connected while receiving the digit is released, and the digits are not received (step 302). Next, the extension number is analyzed and the status of the corresponding extension is checked to determine whether or not it is possible to receive a call (step 303). As a result, when it is determined that the extension can be received, the PB receiver is released and the state changes to a state in which the 9-destination extension is ringing (step 305). Thereafter, response detection and connection control of the called party are performed in the same manner as before.

If it is determined in step 303 that the extension cannot receive a call due to a busy call or the like, steps 306 to 309 are sequentially executed. That is, clear the end of the number reception area by one number, and calculate the number of received digits by IN.

Make it possible to receive numbers (connect the PB receiver to the line) and capture the R3FT (connect to the line).

After this, the state returns to the state (300) in which numbers are being received.

While this number is being received, if the 4 digits of the extension are received and analyzed and it is determined that the extension number does not exist, or if the digits in the middle of 9 are determined to be other than the extension number, the connected tone Or liberate Talkie-A Step 3
10), it is determined whether the last received digit is a predetermined reset dial special number "#°" (step 311).
).

This special number is used when a caller intends to dial "3324" but dials "333" by mistake.

If you notice a mistake and then dial ° "#", it will be detected in this step. Also, when "#" is received from the reset shift sound connection while the other party's extension line is busy, it is also detected in this step.

If it is a reset dial special number, clear the numeric reception area 242 in the call information block 241 for the incoming call from the relevant line in the memory 24 (Step 31B), set the number of received digits 243 to O'' (Step 319), and continue. to capture dial tone (DT) or talkie-A (step 320).
) Returns to the state of receiving numbers (300).

In step 311, if the last received digits are not a special number (because the digits received in the digit reception state 300 are digits other than an extension number), the talkie-B is captured (
The sum is added (step 312), and the talkie sending state (3
13) and notifies the caller that the dialed extension does not exist. In this state, the PB receiver is also connected to the line at the same time. In this case, if a number is not received within a predetermined time, a timeout occurs and the talkie-B is released (step 314), and the PB receiver and line (station 1Ili) are released (step 315). In step 313,
When digits are received, it is determined whether the last of the received digits is a reset dial special number or not. If YES, talkie B is released (step 317) and the process moves to step 318; if NO, the process moves to step 314. .

The process shown in Figure 3 above is not only the connection process for additional number dial-in when a call is received from a central office line from a public telephone exchange, but also the connection process when a call is received from a trunk line connected to another PBX exchange. Additional number sent from (
The same applies when connecting via an extension number). in this case.

Since "#" is used as the reset dial special number, the signal format of the trunk line must be the PB signal format.

[Effects of the Invention] According to the present invention, when an additional number dial-in call or a trunk line call is received, a specific number (special number) is dialed from the 9th line when the incoming line and extension are disconnected due to a busy extension, incorrect dialing, etc. As a result, the caller on the first line can call the extension by dialing the extension number that he or she wants to receive a call from, so the caller on the first line can disconnect the call and make the call again. You can have the call arrive on another extension even if you don't have one. As a result, it is possible to improve the operability of the additional number dial-in service and the trunk line service, and to reduce the fee charged to the central line caller when the additional number dial-in line is a central line.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle configuration of the present invention, FIG. 2 is a diagram showing the configuration of an exchange in which the present invention is implemented, and FIG. 3 is a processing flow diagram of an embodiment.
FIG. 4 is a connection system diagram of a conventional example, and FIG. 5 is a processing flow diagram of a conventional example. In Figure 1. 10: Exchange processing control section 11: Additional number dial connection processing section 12: Specific number reception detection means 13: Number information clearing means 14: Signal tone/talkie connection instruction means 15: Memory setting

Claims (1)

[Scope of Claims] An exchange processing control unit (10
) is a specific digit reception detection means (12) for detecting that specific digits have been received from the line with a signal tone or talkie connected to the line due to the called extension being busy or an incorrect dial.
), numeric information clearing means (13) that is activated by the detection output of the specific numeric reception detection means (12) and clears the numeric information of the additional number that has already been received, and a dial tone or talkie connected to the line. Redialing in an exchange for receiving an additional number dial-in call, which is equipped with a signal tone/talkie connection instruction means (14) for setting a numeric reception state, and connects to the called extension by redialing from the calling party. method.