JPS6393298A - Direct inward dial incoming call display system for push-button telephone system - Google Patents

Abstract

PURPOSE:To enhance direct inward dial (DID) services by rendering a visible display part corresponding to a line wire to display 'in busy' when an incoming call is generated in the line wire and changing 'in busy' display to an incoming display with the aid of a DID number through receiving the number. CONSTITUTION:If an incoming line wire is a DID line wire CO1, a central processing unit CCU refers to a memory M and identifies that the outside line CO1 is the DID line wire. The CCU controls not only all key telephone systems with selection buttons for the line wire CO1 among push-button telephone systems TEL1-TELn but also a line circuit for a reception telephone set TELM and instructs the visible display part to display 'in busy'. At the time of receiv ing the DID number from the line wire CO1 through DID control, the CCU refers to the memory M and judges whether there is the telephone system corre sponding to the DID number or not. If the telephone system TEL1 corresponding to the DID number is idle, the CCU controls the line circuit LC1 when the tele phone system TEL1 is the push-button telephone system. The visible display parts display the incoming call display, instead of 'in busy'.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an incoming call display method for a direct in-dial service in which a call from an outside line is directly incoming to an extension of a telephone exchange, and in particular, the present invention relates to an incoming call display method for a direct in-dial service in which calls from an outside line are directly incoming to an extension of a telephone exchange. This relates to a direct in-dial incoming call display method when displaying on a button telephone.

[Background of the invention]

A direct in-dial service is widely available in which incoming calls from an outside line are directly displayed on a specific extension of a telephone exchange, and when the extension responds, the outside line is directly connected to the extension. Note that this service is also called a dial-in service.

This is called the Direct In-Dial Service (hereinafter referred to as DII) service. ) is provided as follows. In other words, an external line with direct in-dial service (
Hereinafter referred to as DID external line. ), the telephone exchange automatically responds to this incoming call (hereinafter referred to as DID incoming call) and sends response information to the DID outside line. Above DIL
) Upon receiving the above response information, the established telephone station to which the outside line belongs sends the extension number of the destination extension of the DID call or a number corresponding to the extension number (hereinafter referred to as the DID number), and this DID number When received, the telephone exchange displays an incoming call to the DID external line on the extension specified by the DID number. This DID number may be sent from the telephone office or from the destination telephone, and the present invention can be implemented in either case.

By the way, the connection control in the telephone exchange in the DIL service is basically extension connection control (DID number has the same meaning as extension number). That is, D.I.D.
The call control after an extension call due to an incoming call to an outside line is equivalent to the callback transfer call control to the extension phone, and is extension connection control performed by regarding the DID number as the extension 'gj. According to the normal incoming call display control method, an incoming call from an incoming call will be displayed in the form of an extension incoming call, making it impossible to distinguish between an original incoming call and a DID incoming call. In particular, when a key telephone is used as an extension telephone, the DI of the key telephone
It is also extremely inconvenient that the incoming call is not displayed on the visual display corresponding to the D outside line selection button.

In addition, when using a key telephone as an extension telephone, generally the key telephone is configured so that any external line can be freely selected, so if the key telephone is used as an extension other than the extension specified by the DID number, the DID external line Since it is possible to make a call using the DID call, if you make the incoming call display for DID external lines visible only for the button phone of the extension specified by the DID number, it will be possible to make a call using the DID call and the button phone not specified by the DID number There is a risk that there will be a conflict with the transmission from the source. On the other hand, if incoming DID calls are displayed on all button telephones, the significance of DID length and service disappears.

[Purpose of the invention]

The present invention is proposed in order to solve the above-mentioned problems, and aims to provide a reasonable method for displaying incoming DID calls to key telephones.

[Summary of the invention]

For the above purpose, the present invention sets the display of the visible display part corresponding to the above-mentioned DID external line of all key telephones to indicate that the DID external line is in use (for example, the indicator lamp lights up) when an incoming call occurs on the DID external line, and displays the DID number. When receiving a call, the in-use display on the visible display section corresponding to the above-mentioned DID outside line of the button telephone specified by the DID number is changed to an incoming call display (for example, a blinking display lamp). In addition, the audible display of the DID outside line (display by incoming call bell or equivalent means) is D.
This is done only for key telephones specified by ID numbers.

[Configuration of Example]

FIG. 1 is a block diagram showing an example of the configuration of a telephone exchange device implementing the present invention.

As shown in FIG. 1, the switch circuit S N W )C is located inside a telephone (hereinafter referred to as a telephone).

~ Station n, a reception telephone or a relay stand (hereinafter, the reception telephone will be taken as an example) Station M and outside lines C01 to COm are accommodated via line circuits LC, ~LCn, LCM and outside line trunks COT, -COTm, respectively. There is.

The telephone metering device n includes a so-called button telephone that is provided with an outside line selection button and allows you to select an outside line on the telephone, and a so-called standalone telephone that is provided with an outside line selection button and is dangerous. Among these, this is implemented in key telephones. In FIG. 1, the telephones 1i and 1i and the reception telephone device M are all button telephones, and in the following explanation, unless otherwise specified, "2 telephones" does not refer to a button telephone. shall be said.

In addition, there are telephones to which the DID service is provided individually or in groups, and telephones to which the DID service is not provided.In Fig. 1, the telephone fATgL is It is assumed that the telephone, telephone device, and station R to which the DID service is individually provided are telephones to which the DID service is provided as a group.

In addition, outside lines Co and -COm include DID outside line and general 1l.
(This refers to an outside line to which DID service is not provided. The same shall apply hereinafter.) In Figure 1, outside line CO1 is a DID service.
It shall be an outside line.

In addition, the above switch circuit SNW, line circuits LC, -L
In order to collectively control Cn, LCM external line trunk COT, ~C0Tm, a central processing unit (CCU) mainly composed of a so-called one-chip CPU is provided, and it also serves as a storage means for information related to KDID control. outside, %I
Data indicating the type of CO, -Con (data distinguishing whether it is a DID external line or a general external line), DII) Data indicating the correspondence between the DID number sent from the external line CO1 and the telephone horizontal position, ~ position n. Memory M (R
It consists of AM or EFROM. ) is provided.

[Effect of the embodiment]

FIG. 2 is a time chart showing the visual display of the state of the DII) external line in the embodiment of the present invention, and FIG. 3 is a flow chart showing the operation. In the following explanation, symbols in parentheses indicate correspondence with the above-mentioned time chart or flow chart.

When an incoming call occurs on any of the outside lines CO1 to COn (a), the central processing unit (CCU) connects the outside line trunk (COT, ~C) corresponding to the outside line where the incoming call has occurred via the control line t.
0Tn) and determines whether the external line from which the call was received (hereinafter referred to as the incoming external line) is a DID external line.

If the incoming outside line is a general outside line, for example an outside line CO2,
Central processing 22) The CCU performs incoming call display processing for general outside lines (c). The incoming call display process for a general outside line is, for example, displaying an incoming call on the reception telephone device yt. That is, the central processing unit CCU controls the line circuit LCM via the control line t to ring the incoming call bell of the reception telephone device M. Also, is the telephone placed horizontally or ~ placed n out of the relevant range? The process of setting the visual display section of a telephone set corresponding to the selection button of sCO as an incoming call indicator (usually a flashing display) and ringing the incoming call bell of the telephone is also an incoming call display process for a general outside line.

If the incoming external line is an external line CO8, the central processing unit C
The CU refers to the memory M and identifies that the external line CO3 is a DID external line, and thereby all telephone areas and receptions that have selection buttons for the external line COI in the telephone metering device n The line circuit of the telephone is controlled via the control line t, and the visible display section of these telephones for the above-mentioned outside line CO1 is used to indicate that the telephone is in use (usually a lit display).
.

DIL) Upon arrival, the central processing unit CCU next performs DID control with the incoming external line COI (e). That is, the central processing unit CCU uses the control line 1. The external line trunk COT is controlled to be in a response state via the external line trunk COT, and response information is sent to the external line COI.

Then, a DID number is sent to the outside line CO1 from the home office or calling subscriber to which the outside line COI belongs.This DID number is sent to the outside line trunk COT and the control line t.
1 to the central processing unit CCU. The above is DID control.

When a DID number is received from the outside line CO1 through the DID control, the central processing unit (CCU) determines whether or not a telephone corresponding to the DID number exists by referring to the memo IJM (step). If it is determined that there is no telephone corresponding to the DID number, the central processing unit 22) CCU performs the general outside line incoming call display processing or the busy disconnection processing (3) similar to the above C.

Furthermore, if the telephone corresponding to the DID number exists in the above judgment, the central processing unit CCU searches the memo IJM to detect the telephone, and determines whether or not this telephone is in use. to).

Assume now that this telephone range is the telephone dTgL, which solely corresponds to the DID number.

If the phone is placed horizontally and the phone is on a call, the central processing
The CCU performs the general outside line incoming call display processing or the busy disconnection processing in the same way as when proceeding with a "NO" decision in step (6) above.In addition, in the processing of (6) above, It is better to use general outside line incoming call display processing than busy disconnection processing. That is, for example, when an incoming call to an outside line CO is displayed on reception telephones TF and LM, the reception telephone device M displays an incoming call on an outside line C.
o, if you can answer the reception phone,
This is because, after answering, the incoming call can be transmitted to the caller's desired extension or a nearby extension.

If the telephone TFJL is vacant, the central processing unit 22)
The CCU determines whether the telephone device is a button telephone or a standalone telephone (telephone type information is stored in a memory separate from memory M); if it is a button telephone, it controls the telephone. ! 11, the line circuit LC of the telephone device is controlled via the line t, and the display on the town a display section corresponding to the outside line Co of the telephone device is controlled by the in-use display (described above). The visual display shows that it is in use. ) to an incoming call display, and a ring tone is emitted from the audible display (incoming call bell or means equivalent to an incoming call bell). Furthermore, if the telephone set is a standalone telephone, only the control to emit a ringtone from the audible display section is performed (0).

By the way, if the DID number corresponds to a group of telephone devices t-, n, and in the judgment in (g) above, if at least one of the telephone devices, h to h, is not in use, the flow will be changed. If all the telephones are in use, the flow advances to the direction of 'YES'.In addition, in the judgment of (a) above, among the vacant telephones, if the telephone is a key telephone, the flow advances to the direction of 'YES'. If the telephone is a standalone telephone, the flow will proceed in the direction of 'YFJS', and if the telephone is a standalone telephone, the flow will proceed in the direction of 'No'.

As described above, an incoming call to the outside line CO8 is displayed on the visible display section corresponding to the outside line CO1 of the telephone corresponding to the DID number, and when the telephone, for example, a telephone device, responds, response information is transmitted from the line circuit LC1 to the control line. t, to the central processing unit CCU, and the central processing unit CCU
controls the switch circuit SNW based on this response information to connect the outside line CO1 and the telephone device, and also connects the control line 1. control the line circuit LC1 through the telephone fi,
Stops the audible incoming call display and changes the incoming call display on the visible display section for external line CO1 to self-use display (blinking display in a manner different from the incoming call display, or lighting display in a different color from the busy display, however, Figure 2 shows the flashing display.

〔Effect of the invention〕

As explained above in detail, the present invention provides L) when the destination extension of the ID external line is a key telephone;
When an incoming call occurs on the ID external line, first, the visible display section corresponding to the incoming external line of all the key telephones that accommodate the incoming external line is displayed as being in use, and then the key telephone set specified by the DID number corresponding to the incoming external line is displayed. 1) IL) Incoming call, which is one form of extension call, is displayed on the display of the corresponding external line selection button, so it is possible to distinguish between DID incoming call and extension incoming call. Furthermore, when an incoming DID call occurs, a display indicating that the outside line is in use is displayed on the telephone that accommodates the outside line, so there is no conflict between the DID51 call and the outgoing call. D for phones other than those specified by the DID number.
Change of visual display format upon receipt of ID number (i.e.
Since there is no incoming call display), the DID service can be reliably provided, and the present invention is extremely effective when adding the DID service to buttons and telephones.

[Brief explanation of the drawing]

Each of the drawings is a detailed explanation of the present invention; FIG. 1 is a block diagram (relay system diagram), FIG. 2 is a time chart of display format, and FIG. 3 is a flow chart of incoming call display processing. (Main symbols) Position, ~ position n - Telephone CO, ~ COn... External line CCU... Central processing unit.

Claims (1)

[Claims] In the direct in-dial system, in which an incoming call from an outside line is directly displayed on a specific key telephone, and the outside line is directly connected to the key telephone when answered by the key telephone, when an incoming call occurs on the outside line, The display on the visible display section corresponding to the external line of all key telephones that accommodate the external line will be set to indicate that the external line is in use, and upon reception of the direct in-dial number, the incoming external line of the key telephone specified by the direct in-dial number will be A direct in-dial incoming call display method for key telephone devices that converts the in-use display on the corresponding visible display section to an incoming call display.