JPH0261199B2 - - Google Patents

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 known in which an incoming call from an outside line is 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.

Direct Indial Service (hereinafter referred to as DID)
It's called service. ) is provided as follows.
In other words, when an incoming call occurs on an external line to which Direct In-Dial service has been provided (hereinafter referred to as a DID external line), the telephone exchange equipment handles this incoming call (hereinafter referred to as
It's called a DID call. ) and sends response information to the DID external line. Upon receiving the response information, the telephone office to which the DID external line belongs sends the extension number of the destination extension of the incoming DID call or a number equivalent to the extension number (hereinafter referred to as the DID number),
Upon receiving this DID number, the telephone exchange
Displays incoming calls to the above 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, connection control in a telephone exchange in DID service is basically extension connection control (DID number has the same meaning as extension number). In other words, the ringing control of an extension telephone due to an incoming call to a DID external line is equivalent to the call back transfer ring control to the extension telephone, and is extension connection control performed by regarding the DID number as an extension number. According to the normal incoming call display control method, an incoming call from an extension line will be displayed in the form of an extension incoming call, making it impossible to distinguish between an original extension incoming call and a DID incoming call. Particularly when a key telephone is used as an extension telephone, an incoming call is not displayed on the visible display section of the key telephone corresponding to the DID outside line selection button, which is extremely inconvenient.

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. Since it is possible to make calls using the There is a risk that there will be a conflict with the transmission from the source. However, if incoming DID calls are made to be displayed on all key phones, the significance of the DID service will disappear.

[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 provides that when an incoming call occurs on a DID outside line, the DID
The display on the external line compatible visible display section will indicate that it is in use (for example, the indicator lamp lights up), and upon receiving the DID number, the above DID of the button telephone specified by the DID number will be displayed.
The in-use indication on the visible display section for external lines is changed to an incoming call indication (for example, a blinking indicator lamp). Note that the audible display of the DID outside line (display by means of an incoming call bell or equivalent means) is performed only for the key telephone set designated by the DID number.

[Configuration of Example]

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

As shown in Figure 1, the switch circuit SNW has extension telephones (hereinafter referred to as telephones) TEL ₁ to
TEL _o , reception telephone or relay stand (hereinafter, the reception telephone is taken as an example) TEL _M and outside lines CO ₁ to _{CO n} are connected via line circuits LC ₁ to _{LC o} , L _M and outside line trunks COT ₁ to COT _n , respectively. are accommodated.

Telephones TEL ₁ to TEL _o include so-called button telephones, which are equipped with an outside line selection button and allow you to select an outside line, and so-called standalone telephones, which are not equipped with an outside line selection button.
Among these, the present invention is implemented in a button telephone. In Figure 1, the telephones TEL ₁ to TEL _o and the reception telephone TEL _M are all button telephones, and in the following explanation, unless otherwise specified, "telephone" refers to a button telephone. shall be.

In addition, telephones TEL ₁ to TEL _o include telephones to which DID service is provided individually or in groups,
There are some telephones that are not provided with DID service, and in Figure 1, telephone TEL ₁ is independently DID
Telephone with service, telephone TEL ₂ ~
It is assumed that TEL _R is a telephone to which DID service is provided in the group.

In addition, external lines CO ₁ to _{CO n} include DID external lines and general external lines (external lines to which DID service is not provided. The same applies hereinafter).
Assume that CO ₁ is a DID outside line.

In addition, the above switch circuit SNW, line circuit
In order to collectively control LC ₁ to LC _o and _LCM external line trunks COT ₁ to _{COT n} , a central processing unit CCU mainly composed of a so-called 1-chip CPU is provided, and further information related to DID control is provided. Data indicating the type of outside line CO ₁ to CO _o (DID
data to distinguish between outside lines and general outside lines), DID
DID number sent from outside line CO ₁ and telephone
A memory M (comprised of RAM or EPROM) is provided for storing data indicating correspondence with TEL ₁ to TEL _o in a table format.

[Effect of the embodiment]

FIG. 2 is a time chart showing the visual display of the state of the DID 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 CO ₁ to _{CO o}
(b) The central processing unit CCU receives the incoming call information from the external line trunk (any of COT ₁ to _{COT o} ) corresponding to the external line where the incoming call occurred via the control line _l1 , and transmits the incoming call information to the external line ( (hereinafter referred to as an incoming external line) is a DID external line (b).

If the incoming external line is a general external line, for example an external line _CO2 , the central processing unit CCU performs incoming call display processing for the general external line (c). The incoming call display process for a general outside line is, for example, displaying an incoming call on the reception telephone TEL _M. That is, the central processing unit CCU controls the line circuit _LCM via the control line _l2 to ring the incoming call bell of the reception telephone _TELM . In addition, among the telephones TEL ₁ to TEL _o , the visible display part of the telephone that has a selection button for the outside line CO ₂ will be used as an incoming call display (usually a flashing display), and the incoming bell of the telephone will ring. The process is also an incoming call display process for a general outside line.

When the incoming external line is external line CO ₁ , the central processing unit CCU refers to memory M and determines whether the external line CO ₁ is
It identifies that it is a DID external line, and thereby first controls the line circuit of all telephones that have the selection button for the external line CO ₁ among the telephones TEL ₁ to _{TEL o} and the reception telephone TEL _M via the control line l ₂ . , the visible display section of these telephones for the above-mentioned outside line CO ₁ shall indicate when the telephone is in use (usually a lit display) (d).

Upon receiving a DID call, the central processing unit CCU next performs DID control with the incoming outside line _CO1 (e).
That is, the central processing unit CCU controls the outside line trunk COT ₁ via the control line _l1 to put it into a response state, and sends response information to the outside line CO ₁ . As a result, the DID number is sent to the outside line CO ₁ from the telephone office to which the outside line CO ₁ belongs or the calling subscriber. this
The DID number is received by the central processing unit CCU via the external trunk COT ₁ and the control line _l1 . More than
It is DID control.

When a DID number is received from outside line CO ₁ by the above DID control, the central processing unit CCU
It is determined whether or not a telephone corresponding to the number actually exists by referring to the memory M (f). If it is determined that there is no telephone corresponding to the DID number, the central processing unit CCU performs the same general outside line incoming call display process as in (c) above or the busy disconnection process (e).

Additionally, if the telephone corresponding to the DID number exists in the above judgment, the central processing unit CCU searches the memory M for the telephone to detect it, and determines whether or not this telephone is in use. ). This phone is now the only phone that supports DID numbers.
TEL shall be ₁ .

If the telephone TEL ₁ is busy, the central processing unit CCU performs the general outside line incoming call display processing or the busy disconnection processing (e) in the same way as when the decision in (f) is made to proceed to "NO". .

Note that in the process (e) above, the general outside line incoming call display process is better from the service standpoint than the busy disconnection process. In other words, for example, an outside line is placed on the reception telephone TEL _M.
By displaying the incoming call from CO ₁ , you can respond to the outside line CO ₁ using the corresponding reception phone TEL _M.
This is because, after answering at the reception telephone TEL _M , the incoming call can be transferred to the caller's desired extension or an extension nearby.

If the telephone TEL ₁ is empty, the central processing unit CCU determines whether the telephone TEL ₁ is a button telephone or a standalone telephone (H) (telephone type information is stored in a separate memory from the memory M). ), if it is a button telephone, it controls the line circuit LC _{1 of the telephone TEL 1 through} the control line L ₂ ,
The display on the visible display section corresponding to outside line CO ₁ of the telephone TEL ₁ is changed from the in-use display (the visible display section has been set to the in-use display in the process (d) above) to the incoming call display ( (l), a ring tone is emitted from the audible display unit (an incoming call bell or means equivalent to an incoming call bell) (n). Further, if the telephone TEL ₁ is a standalone telephone, only the control to emit a ringtone from the audible display section is performed (N).

By the way, when the DID number corresponds to _{a group of telephones TEL 2 to TEL R} , the flow is " If all are busy, the flow goes in the "YES" direction. In addition, in the judgment in (H) above, among the vacant telephones, the flow should proceed in the direction of "YES" for those that are key telephones, and the flow should proceed in the direction of "NO" for those that are stand-alone telephones. becomes.

As described above, an incoming call to the outside line CO ₁ is displayed on the visible display section of the phone corresponding to the DID number corresponding to the outside line CO ₁ , and the incoming call is displayed on the visible display section of the phone corresponding to the DID number, such as the phone TEL ₁ .
When a response is made, the response information is sent from the line circuit LC ₁ to the central processing unit CCU via the control line L ₂ .
Based on this response information, the central processing unit CCU controls the switch circuit SNW to connect the outside line CO ₁ and the telephone.
At the same time, the line circuit LC ₁ is controlled via the control line _{L 2} to stop the audible incoming call display on the telephone TEL ₁ , and the incoming call display on the visible display section corresponding to the outside line CO ₁ is changed to the self-use display ( (However, FIG. 2 shows a blinking display.).

〔Effect of the invention〕

As explained above in detail, the present invention
When the destination extension of an external line is a key telephone, when a call is received on the DID external line, first the visible display part corresponding to the incoming external line of all key telephones that accommodate the incoming external line is displayed as being in use. , Next, the visible display part of the key telephone designated by the DID number corresponding to the incoming external line is converted to an incoming call display, and the DID is one form of receiving an internal call.
Since the incoming call is displayed on the display of the corresponding external line selection button, it is possible to reliably distinguish between an incoming DID call and an incoming extension call, and at the same time as the incoming DID call occurs, the telephone accommodating the external line shows that the external line is in use. There is no conflict between incoming and outgoing DID calls, and furthermore, there is no change in visual display format (i.e. incoming call display) due to reception of the DID number on phones other than those specified by the DID number. The present invention is extremely effective in adding DID services to key telephones, such as the ability to reliably provide services.

[Brief explanation of drawings]

The drawings are diagrams for explaining embodiments 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, TEL ₁ ~ TEL _o ... Telephone, CO ₁ ~
CO _o ...External line, CCU...Central processing unit.

Claims (1)

[Claims] 1. When an incoming call occurs on an outside line under the direct in-dial system, in which an incoming call from an outside line is directly displayed on a specific key telephone, and when answered by the button telephone, the outside line is directly connected to the key telephone. , the display on the visible display section corresponding to the external line of all the key telephones that accommodate the external line will be displayed as being in use, and upon reception of the direct in-dial number, the above-mentioned incoming call will be sent to the key telephone specified by the direct in-dial number. A direct in-dial incoming call display method for pushbutton telephone equipment that converts the in-use display on the visible display section for external calls to an incoming call display.