JP2001144857A - Telephone exchange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telephone exchange capable of preventing the wrong number of an originator from being reported to a call-incoming destination in originating a call from an extension to an office line. SOLUTION: The telephone exchange having a storing means for storing a relation between a call-incoming outside line and an extension to call-income a call-incoming signal from the office line to the extension, based on the stored contents of the storing means, is provided with an office line group storing means for storing a group of plural office lines, an available office line detecting means for detecting the available state of an office line include in the group when a call-originating request occurs from the extension and a corresponding extension detecting means for detecting whether the available office line detected by the available office line detecting means is in correspondence with the extension, the originating of which is requested, based on the storing means. Then, when the detected available office line is not in correspondence with the extension, the originating of which is requested, the exchange sends the rejection of informing a call-incoming destination of an originating number of a network.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone exchange apparatus capable of notifying a called party of a calling party number.

[0002]

2. Description of the Related Art In recent years, as a service of not only the ISDN network but also an analog network, there is a service of notifying a caller number to a called side (caller number notification service). By using this service, recent telephones allow the user to confirm the caller's incoming call by displaying the caller ID on the display unit before answering, and to store the outgoing call stored as a call history. In some cases, dialing is automatically performed using a user number to improve convenience at the time of outgoing / incoming calls.

[0003] In the field of telephone exchanges, a function of utilizing this network service has recently been developed. FIG.
6 are diagrams for explaining a conventional telephone exchange. The conventional telephone exchange 41 shown in FIG. 4 has a memory (not shown), and the memory stores in advance the incoming call table shown in FIG. 5 indicating the relationship between the office line and the extension of the called party. Then, as shown in FIG. 4, when there is an incoming call from the office line, first, which office line has been received is detected, and then the extension of the destination is determined based on the table.
Make a call to the extension of this destination. For example, according to the table shown in FIG. 5, if there is an incoming call from the office line 45, an incoming call is made to the extension 42, if there is an incoming call from the office line 46, an incoming call is made to the extension 43, and an incoming call from the office line 47 is received. If there is, an incoming call is made to extension 44. On the other hand, at the time of outgoing call, when calling from the extension to the office line using the above-mentioned caller ID receiving function, the network side judges the grasped office line according to the operation of the extension telephone, and the network The line number (so-called telephone number) assigned to the line will be notified to the called party. However, as a function of the telephone exchange, when calling from the extension to the line, the line is blocked and the call cannot be made. In order to solve the problem, there is a device that automatically searches for a free line in a line group (a free line search function).

[0004]

However, conventionally, the following problems have been encountered in telephone exchanges having the above two functions, namely, a caller ID receiving function and a free office line search function. As shown in FIG. 6, for example, when a vacant line search function is used to search for a vacant line at the time of calling from the extension 42, the line 45 that has been used as a destination in the incoming call table is already used and blocked. In this case, the station line 46 not associated with the station line 45 may be selected instead of the station line 45. In this case, the caller ID of the extension 42 notified to the called party is determined by the network by the number of the station line 46 ( Telephone number). Then, in this case, even if the caller number is dialed back at the notified end, the extension 43 corresponds to the office line 46 where the incoming call was received in the incoming call table of the telephone exchange. Extension 4
2 had a problem that they could not receive calls.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a telephone exchange which can prevent an erroneous caller ID from being notified to a called party when a call is made from an extension to an office line. is there.

[0006]

In order to achieve the above object, a telephone exchange according to the present invention has storage means for storing a relationship between a destination line and an extension, based on the storage contents of the storage means. In a telephone exchange device for receiving an incoming call signal from an office line to an extension, an office line group storage means for storing a group consisting of a plurality of office lines, and a telephone line included in the group when a call is requested from the extension. Empty line detecting means for detecting the state of empty, and corresponding extension detecting means for detecting whether the empty line detected by the empty line detecting means based on the storage means is in correspondence with the extension for which transmission was requested, If the detected vacant line does not correspond to the extension for which the transmission was requested, a notification rejection of the calling number to the destination is rejected to the network.

Further, the telephone exchange apparatus of the present invention has at least one extension telephone at an extension, and utilizes a storage means for storing a relationship between a called station line and an extension based on the storage contents of the storage means. In a telephone exchange apparatus for receiving an incoming call signal from a line to the extension, a station line group storage means for storing a group consisting of a plurality of station lines, and a station included in the group when a call request from the extension is made. A vacant local line detecting means for detecting a vacant state of a line, and a corresponding extension detecting means for detecting whether the vacant local line detected by the vacant local line detecting means based on the storage means corresponds to the extension for which the transmission request was made. If the detected free station line does not correspond to the extension for which the call was requested, a notification rejection of the calling number to the called party is rejected to the network.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG.
~ 2-n is extension phone, 3-1 ~ 3-m is local line (external line), 4 is
The ISDN telephone 5 is an ISDN office line.

The exchange 1 includes an exchange circuit 11, trunk circuits 12-1 to 12-m forming one group, line circuits (subscriber circuits) 13-1 to 13-n, an ISDN extension interface 14, and an ISDN. It comprises a line interface 15, a control unit (central control unit) 16, and a storage unit 17.

The exchange circuit 11 exchanges and connects the extension lines with each other or between the extension line and the office line. The control unit 16 uses this switching circuit
It is responsible for the overall control, including the control of the 11 replacement operations.

The storage unit 17 stores programs for the control unit 16 and
Various tables including the table shown in FIG. 2 and data relating to the set functions are stored. Further, the storage unit 17 stores various information generated in the exchange,
Here, a program for controlling data exchange between the exchange 1 (not shown) and a connectable maintenance terminal is stored.

The line circuits 13-1 to 13-n are connection interfaces provided for each extension, and serve as connection interfaces between the switching circuit 11 and each extension telephone. The trunk circuits 12-1 to 12-m are respectively connected to the switching line 11 and the corresponding office line 3-.
It is a circuit that interfaces with 1 to 3-m and detects incoming calls and closes a DC loop for capturing local lines.

Here, when a call is received from the public network to these trunk circuits, the storage unit 17 stores
Line circuit 13-1 for trunk circuit 12-1, line circuit 13-2 and trunk circuit 12-m for trunk circuit 12-2
, Line circuits 13-n are respectively set.

The above-mentioned components in the exchange 1 are connected to the control unit 16 via a control highway 18 and
16 controls the switching circuit 11 according to a control program stored in the storage unit 17 so that a communication path between the line circuits 13-1 to 13-n and the trunk circuits 12-1 to 12-m is formed. Exchange operation is enabled. The ISDN telephone 4 is a terminal that can respond when there is an incoming call from the ISDN network 5.

Next, the operation of the exchange 1 will be described below. (Incoming call operation from office line) When there is an incoming call from office line 3-1 to 3-m, the control unit 16 detects the incoming call by one of the trunk circuits 12-1 to 12-m, and Call the extension at. Then, a communication path is secured by the switching circuit 11 or the like in response to the extension telephone, and communication between the two is enabled. (Calling operation to office line) As shown in the table shown in FIG. 2, office lines 3-1 to 3-m for notifying the telephone number of the caller (hereinafter referred to as calling number) correspond to the extension. The data is stored in the storage unit 17 as data.

First, an outgoing call operation to an office line will be outlined. For an outgoing call from an extension line to an office line, a request to send an office line from the line circuit 13-1 is generated by a call operation of an extension telephone, and the control unit 16 After recognizing that the request is for a local line transmission, the trunk circuit 12-1 corresponding to the line circuit 13-1 is derived from the table of FIG. In the selected trunk circuit 12-1, the use status of the office line is checked, and if the office line is free, a call to the office line (output of dial information) is performed. As a result, the number assigned to the called party to the trunk circuit 12-1 is notified to the called party from the public network as the calling party number, and the called party can communicate with each other by responding.

On the other hand, if the trunk circuit 12-1 is in use, the control unit 16 selects another trunk circuit 12-2 in the group to which the trunk circuit 12-1 belongs, and performs transmission to the office line. Will be done. At this time, the selected trunk circuit 12-2
Does not have a caller number assigned to the line circuit 13-1, which is the caller, the control unit 16 adds a caller ID notification rejection number to the incoming call number, and the trunk circuit 12-2 Send to

Next, the transmission operation to this office line will be described in detail with reference to the flowchart of FIG. The control unit 16 of the exchange 1 constantly monitors requests from each component in the exchange 1 and starts the flowchart when there is a request.

First, it is determined whether or not a request from the line circuits 13-1 to 13-n is a transmission request (step 301).
If it is an outgoing call request, it is next determined whether or not this request is a request for an outgoing line (step 302).

If it is determined in step 302 that the request is for a line transmission, a line (trunk) corresponding to the extension requested to be transmitted is selected with reference to the table of FIG.
It is detected whether or not this station line is free (step 3-
3). For example, when the extension request is made by the extension telephone 2-1, select the office line 3-1 (trunk 12-1) corresponding to this extension and detect whether or not the office line 3-1 is free. Becomes

Next, when the office line corresponding to the extension is vacant at step 303, a ring back tone is transmitted to the extension telephone and a dial input from the extension telephone is waited for (step 304). Case (Step 30
In 5), the input dial is transmitted to a station (public network) (step 306).

On the other hand, if the office line corresponding to the extension is not vacant at step 303, it is detected whether or not a camp-on request is made from the extension telephone (step 307). If there is a camp-on request, the process returns to step 303 and waits until the station line corresponding to the extension becomes empty. If there is no camp-on request in step 307, it is detected whether another free office line (for example, office line 3-2 (trunk 12-2)) of the group to which the office line corresponding to the extension belongs is available (step 307). 308) If no other office line is available, a busy tone is sent to the extension telephone (step 30).
9).

On the other hand, at step 308, another free office line of the group to which the office line corresponding to the extension belongs (for example, office line 3-2)
If (trunk 12-2)) is free, a ring back tone is sent to the extension telephone (step 310),
Wait for a dial input from the extension telephone (step 31)
1). Here, if there is a dial input, a notification rejection number (for example, 184) is added to the input dial number, and the dial number is transmitted to the station (public network) (step 31).
2).

Although the case where the destination line is an analog line has been described above, the present invention is similarly applicable to a digital line (digital network) such as ISDN capable of transmitting a calling number.

[0025]

As described above, according to the telephone exchange apparatus of the present invention, it is possible to prevent an erroneous caller ID from being notified to a destination when a call is made from an extension to an office line. In addition, even when the calling party number notified from the telephone exchange device is used at the time of making a return call at the destination, it is possible to prevent the call from being received by an inappropriate party.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a table showing a relationship between an extension and a station line for notifying a calling number in the embodiment of the present invention.

FIG. 3 is a diagram showing a flowchart of a local line transmission operation in the embodiment of the present invention.

FIG. 4 is a diagram for explaining an incoming call operation in a conventional telephone exchange.

FIG. 5 is a diagram showing a table representing a relationship between a station line used for receiving a call and a destination in a conventional telephone exchange;

FIG. 6 is a diagram for explaining an outgoing / incoming operation in a conventional telephone exchange.

[Explanation of symbols]

 1 exchange 2-1 to 2-n extension telephone 3-1 to 3-m office line (external line) 11 exchange circuit 12-1 to 12-m trunk circuit 13-1 to 13-n line circuit 14 control unit 15 storage unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K024 AA02 AA61 AA62 BB04 CC01 DD05 GG00 GG03 GG11 5K049 AA07 BB04 CC05 CC11 EE04 EE11 FF01 FF32 FF36 FF43 GG00

Claims (6)

[Claims] 1. A telephone exchange device having storage means for storing a relationship between an incoming office line and an extension, and receiving an incoming call signal from an office line to said extension based on the storage contents of said storage means. Station line group storage means for storing a group consisting of station lines; empty line detection means for detecting the state of empty line lines included in the group when there is a call request from the extension; and Corresponding extension detecting means for detecting whether or not the vacant office line detected by the vacant office line detecting means is in correspondence with the extension for which the transmission request has been made; and A telephone exchange device for transmitting rejection of notification of a calling number to a called party to a network when it is not relevant. 2. An extension having at least one extension telephone, and using a storage means for storing a relationship between a called office line and an extension, receiving an incoming call signal from the office line based on the storage contents of the storage means. In a telephone exchange device for receiving an incoming call at an extension, an office line group storage means for storing a group consisting of a plurality of office lines, and detecting an empty state of an office line included in the group when there is a call request from the extension. A vacant local line detecting means, and a corresponding extension detecting means for detecting whether the vacant local line detected by the vacant local line detecting means is in correspondence with the extension for which the transmission request was made based on the storing means, A telephone exchange device for transmitting rejection of notification of a calling number to a called party to a network when an available line does not correspond to an extension for which a calling request has been made. 3. The apparatus according to claim 1, wherein, when selecting an empty station line when calling from an extension, a corresponding station line stored in said storage means is selected first. Telephone exchange. 4. If the detected empty station line does not correspond to the extension requested to be transmitted as a result of the detection by the corresponding extension detecting means, whether or not to camp on the extension telephone associated with the extension. 3. The telephone exchange according to claim 1, further comprising a first notification unit for notifying an inquiry. 5. If the detected empty station line does not correspond to the extension requesting the transmission as a result of the detection by the corresponding extension detecting means, the extension telephone corresponding to the extension requesting the transmission is immediately transmitted to the extension telephone. 3. The telephone exchange according to claim 1, further comprising a second notifying unit for notifying that the vacant office line does not correspond to the extension. 6. If the detected free station line has a corresponding relationship with the extension requesting the transmission as a result of the detection by the corresponding extension detecting means, the extension telephone corresponding to the extension requesting the transmission is immediately transmitted to the extension telephone. 3. The telephone exchange according to claim 1, further comprising third notification means for notifying that the vacant office line is associated with the extension.