JPH0310452A - Private branch exchange - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of an extension terminal equipment by rejecting an incoming call when the incoming call is a call without addition of an incoming subaddress information element specifying an incoming terminal equipment. CONSTITUTION:When a call setting message is received as an incoming call from a line 1 via an ISDN interface 4, a CPU 10 discriminates whether or not an incoming subaddress information element exists in the call setting message. When no incoming subaddress information element exists as the result of discrimination or the connection to an extension terminal equipment is disabled, it is informed. That is, in the case of an incoming call without provision of the incoming subaddress information element specifying the incoming terminal equipment, the incoming call is rejected. Then the utilizing efficiency of the extension terminal equipment is improved without responding to an undesired incoming call.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a private branch exchange, and particularly to a private branch exchange connected to a digital public network.

[Prior Art] In recent years, with the development of digital communication technology, conventional public telephone networks have also come to be configured with digital lines. In the l5DN, which is a typical public communication network, when dialing a call, it is possible to send a subaddress in addition to the other party's line number, so the subaddress can be used to specify the extension of the private branch exchange connected to the network. It is now possible to receive calls directly.

[Problems to be Solved by the Invention] However, in the conventional example described above, in the case of an incoming call without a called subaddress added, all extension terminals corresponding to the line number are ringed, resulting in the following drawbacks: there were.

(1) There is a high possibility that the sender does not wish to communicate or the terminal responds (this means that the responder or terminal will be used for communication that is not originally necessary, which is uneconomical). It is true.

(2) If the relevant terminal is a facsimile machine or the like, situations such as leakage of secrets and loss of documents may occur due to a terminal that should not originally receive the call responding.

(3) The receiving side accepts incoming calls from parties other than those to whom the subaddress has been notified in advance (even if there is no other party, unnecessary incoming calls will be accepted, reducing traffic and economic efficiency).

Furthermore, when the called side does not respond due to the called subaddress not being added or layer compatibility mismatch, etc., the calling side does not know the clear reason for not getting a response and wants to communicate no matter what. Problems are occurring in such cases.

The present invention was made to solve the above problems, and
In the case of an incoming call that does not include a called subaddress information element that identifies the called terminal, by rejecting the incoming call,
To provide a private branch exchange capable of improving the utilization efficiency of extension terminals without responding to unnecessary incoming calls and notifying the caller of this fact.

[Means for Solving the Problems] In order to achieve the above object, the private branch exchange of the present invention has the following configuration. That is, in a private branch exchange that accommodates a plurality of extension terminals and performs circuit switching by identifying the called terminal from the extension terminals based on the called subaddress information element included in the called information, the called information including the called subaddress information element is received. receiving means;
a determining means for determining whether or not there is a called subaddress information element in the incoming call information from the receiving means; It has a means of informing about taste.

[Operation] In the above configuration, incoming call information including a called subaddress information element is received, and it is determined whether or not there is a called subaddress information element in the incoming call information.

Then, as a result of the determination, if there is no destination subaddress information element or if connection with the extension terminal is not possible, it operates to notify that fact.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Description of Configuration (Fig. 1)> Fig. 1 is a configuration diagram of a private branch exchange in which the present invention is implemented. In the figure, l is an l5DN line (the line number is 123-
4567>, 2 is the l5DN line (the line number is 12
3 = 7654), 3 is a private branch exchange, 4.5 is l5
DN interface (I/F), 6 is a CPU that controls the l5DN interfaces 4 and 5, 7 is a ROM that stores the CPIJ6 program, 8 is a RAM that the CPU 6 uses as work when executing processing, 9 is an exchange switch memory (MTS), 10 is a main CPU that controls the entire exchange 3, 11 is a ROM that stores the processing procedure (program) of the CPU 10, which will be described later, 12 is a RAM that is used as a work when the CPU10 executes processing, and 13 is a highway , 14 is an extension interface card, 15.16 is a CPU that controls the extension interface card, 17 to 20
is an extension interface (LC), 21 to 26 are l5DN telephones connected to the extension interface 17, and 27.
28 is l5DNG connected to extension interface 17
4 facsimile, 29-31 is extension interface 18
32 is an l5DNG4 facsimile connected to the extension interface 18, 33-
36 is an l5DN telephone connected to the extension interface 19, 37.38 is an l5DNG4 facsimile connected to the extension interface 19, 39 is an l5DN telephone connected to the extension interface 20, 40 is an l5DNG4 facsimile connected to the extension interface 20,
41 is a terminal group that responds to incoming calls on line l;
42 times! II 2 is a terminal group that responds to an incoming call, and 43 is a keyboard for setting terminal subaddress information, which will be described later.

Explanation of Initial Settings> Next, the initial settings in which the user of the private branch exchange 3 configured as described above sets the number of the extension terminal to ring for the incoming line will be described.

First, the extension terminal (21) connected to which extension interface (17 to 20) is determined by the incoming line (1 or 2).
-40) Specify whether to make one sound. Next, the subaddress numbers of the extension terminals connected to each of the extension interfaces 17 to 20 are set. For example, the subaddresses of each extension terminal 21 to 40 are assigned numbers 21 to 40 respectively.
40, in this embodiment, in response to an incoming call to line 1, the incoming call to line 2 is sent to the extension terminal connected to extension interface 17.18, that is, the terminal with subaddresses 21 to 32. In response to an incoming call, the extension terminals connected to the extension interfaces 19 and 20, that is, the terminals at subaddresses 33 to 40, are notified of the incoming call.

The keyboard 43 is used to set each of the conditions described above. The setting method is, for example, "#1=17=2
1.22.23.24.25.26.27.28”“#
1=18=29.30,31.32"#2=19=3
3.34, 35.36, 37.38 ”“#2=20=
39.40'' are inputted sequentially from the keyboard 43, and the inputted data is stored in the RAM 12.Furthermore, each subaddress is set on the extension terminal side.

This setting method depends on the type of extension terminal and is not related to this private branch exchange, so a detailed explanation thereof will be omitted.

<Recording of voice data> Next, recording of response voice when a destination subaddress is not received will be described.

As will be described later, the responder needs to change the content depending on the situation, and in this embodiment, it is assumed that several types of voices can be recorded depending on the situation. For example, if the extension terminal cannot be identified and connected because the called subaddress has not been added, voice of response voice type l is sent to the network side, and even though the called subaddress has been added, the terminal with the corresponding subaddress If there is no response voice type 2 on the extension, voice of response voice type 2 is sent to the network side. Further, the audio data to be sent out is stored at an address of the audio data storage memory 44 defined according to each situation.

To record this voice data, manually enter "#123#l#" using the dial keys of the extension terminal (telephone), and the response message can be recorded when no called party subaddress is added. In this state, for example, ``Connection is not possible because the destination subaddress has not been added.'' ” is generated in the microphone of the handset, and when the “#゛°° key is pressed after the generation is finished, the voice data is stored at the address l of the voice memory 44.
is stored in Note that the number "123" input earlier is an identification number to prevent erroneous recording.

Similarly, if the destination subaddress is added but the terminal with the corresponding subaddress is not on the extension, "#123#2
#" You can start recording manually. This allows a response message such as "There is an error in the subaddress. Please check and call again." to be recorded in the voice memory 4.
It will be stored at address 2 of 4.

Explanation of processing procedure (Figure 2)> Next, when an incoming call is received in this embodiment, the CPL
The processing procedure executed by J10 will be described below with reference to the flowchart shown in FIG.

First, in step Sl, when a call setup message is received from line 1 via 15DN interface 4,
The CPU 10 advances the process to step S2 and detects the destination subaddress information element included in the call setup message. The result is determined in step S3, and if the called subaddress information element is detected, the process proceeds to step S7, and the extension terminal stored in the RAM 12 is used to specify the extension terminal corresponding to the subaddress. Find subaddress information. This search process uses the subaddress 2 of each extension terminal connected to the extension interface 17.18 for the received subaddress and the incoming call to line l.
1 to 32 and determines whether a corresponding extension terminal exists or not.

For example, if the viewed subaddress is '21', as a result of the comparison, there is a terminal with the subaddress '21°', so the CPU 10 advances the process to step Sit and checks layer consistency. As a result, higher layer consistency,
If the lower layer compatibility and the like match, the process advances to step S15, and the CPU 15 for controlling the extension interface is notified of the incoming call. Then, a call setup message is sent from the extension interface 17 to the extension terminal, and
Each extension terminal 21-2 that received the call setup message
8, only the extension terminal 21 whose subaddress matches returns a response message to the extension ink face 17.

At this time, if the corresponding extension terminal is in a busy state, the process advances from step S16 to step S17, and a busy process is executed. In this process, the reason display information element indicates that the user is busy via the extension interface 17.
This is a process of transmitting in-channel information (busy tone) to the network via the 15DN interface 4. However, if the extension terminal 21 is not busy, the process advances to step S18, calls the extension terminal 21, and when a response is detected via the CPtJ 15, the response is transmitted to the 15DN interface 4.

Then, a response message is sent from the ISDN interface 4 to the network side, and communication is started (step 519).
).

On the other hand, if the result in step Sll is that the high layer consistency, low layer consistency, and consistency do not match, step SL2
The process proceeds to , and a response message is sent. Then, in step S13, when the state is changed to a state in which transparent communication with the network side is possible, in the next step S14, a notification to the effect of layer consistency mismatch is sent. Here, audio RAM4
The voice data stored in the layer consistency mismatch address in 4 is sent to the network, and the reason why the extension terminal cannot respond is clearly explained to the caller.

Also, if the received subaddress is 33°, R
As a result of comparison with the data in AM12, since there is no extension terminal with the corresponding subaddress "33" in the extension terminal group 41, the process advances to step S8. Then, in step S8, a response message is sent, and in step S9, the state becomes communicable, and step SI
In O, I received the message ``There is an error in the subaddress. Please check and try again.'' The voice data J is sent to the network.

On the other hand, in step S3, if the called subaddress cannot be detected in the received call setup message, the process advances to step S4, and an instruction to send a response message is sent to l5.
Notify the DN interface 4. Next, step S5
When the state shifts to a communicable state, the audio data stored at address l of the audio RAM 44 is sent out in step S6. Through this process, the caller can learn the reason for not being able to connect by hearing the response voice message ``Connection is not possible because no @subaddress has been added.''

As explained above, this embodiment has the following effects.

(1) Responder for communications that are not originally required, such as when a destination subaddress is not added.

Response terminals are no longer used, improving office efficiency.

(2) If the relevant terminal is a facsimile machine or the like, a terminal that should not originally receive a call will not respond, and confidentiality can be maintained and document loss can be prevented.

(3) It is possible to accept incoming calls from parties other than those to whom the sub-address has been notified in advance on the receiving side (if there is no other party, there is no need to accept unnecessary incoming calls), which improves traffic and economic efficiency.

(4) By notifying the caller by voice of the reason why the connection cannot be made, the caller can take appropriate action based on detailed information, which is efficient for the caller as well.

In this embodiment, the sub-address settings of the extension terminals are set using the keyboard inside the exchange, but even if the main CPU collects and sets the contents set at each extension terminal via the extension interface control CPU, the same result will not occur. Content data can be stored in RAM. Also, this allows
Settings can be simplified.

Further, in this embodiment, the audio data is stored in the memory (RAM), but the same effect can be obtained by using a magnetic tape for recording the audio.

Furthermore, in this embodiment, the extension interface is equivalent to the l5DN interface, and eight terminals can be connected to the bus from one extension interface, but the extension side of the exchange needs to be equivalent to the l5DN interface. There isn't.

That is, as shown in Fig. 3, if one extension terminal can be connected to one extension ink face and a subaddress is defined for each extension terminal, after the main CPUI receives the destination address information element, , simply switch the exchange switch and connect the line to the extension interface having the corresponding sub-address terminal.

[Effects of the Invention] As explained above, according to the present invention, if an incoming call does not include a called subaddress information element that specifies the called terminal, it is possible to respond to an unnecessary incoming call by rejecting the incoming call. This makes it possible to improve the efficiency of using extension terminals and to make the calling party aware of the benefits.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a private branch exchange in this embodiment, FIG. 2 is a flowchart showing the incoming call processing procedure in this embodiment, and FIG. 3 is a diagram showing the configuration in a modified example. In the figure, 1.2...l5DN line, 4.5...l5D
N interface, 9...MTS% lO...CP
U, 17-20... extension interface, 43...
Keypad, 44...Voice memory.

Claims (1)

[Scope of Claims] In a private branch exchange that accommodates a plurality of extension terminals and performs circuit switching by identifying a called terminal from the extension terminals based on a called subaddress information element included in incoming call information, the incoming call includes the called subaddress information element. a receiving means for receiving information; a determining means for determining whether or not there is a called sub-address information element in the incoming information from the receiving means; A private branch exchange characterized by having a notification means for notifying when connection with a terminal is impossible.