JPH05308668A - Electronic key telephone system - Google Patents

Abstract

PURPOSE:To call back the incoming after the end of speaking in the case of the incoming to a busy key telephone set from an ISDN line. CONSTITUTION:When a call comes to an ISDN line 1, it is reported to a CPU 4 through a line interface 7. The CPU 4 obtains the state of the handset of a key telephone set 100 as the incoming destination through a key telephone set interface 3; and if it is in the off-hook state, the CPU 4 stores the telephone number of the originating subscriber of the incoming call to the ISDN line in an outgoing number memory 6 of a RAM 5. Thereafter, the CPU 4 reads out this telephone number in the outgoing number memory 6 to send it to the line interface 7 when detecting the off-hook operation after on-hook of the handset of the key telephone set 100 through the key telephone set interface 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic key telephone device and, more particularly, to an incoming call on an ISDN line.

[0002]

2. Description of the Related Art Conventionally, an electronic key telephone device has a call receiving service of a general public line,
When a telephone call is received during a call, when a call is received, the subscriber is informed by sound that the call is received.

[0003]

[SUMMARY OF THE INVENTION In conventional electronic key telephone system described above, and it becomes necessary to have a call waiting service for incoming busy, just because coming call is received during a call The current call will be put on hold and the conversation will need to be interrupted. Also, if there is no call waiting service, the caller who called the calling subscriber will end this call. Until then, there was a problem that it was necessary to repeat the calling operation.

[0004]

SUMMARY OF THE INVENTION An electronic key telephone device of the present invention is an electronic key telephone device which is equipped with an ISDN S / T point interface and accommodates a key telephone having an indicator, and receives an incoming call to an ISDN line. When there is a call, the calling party has a calling party number memory to store the calling party number, which is the telephone number of the calling party in the call setting information sent from the network side, for each button telephone Means for writing the calling party number in the calling party number memory, means for reading out the information written in the calling party number memory when the telephone call is ended and ending the call, and the read information The ISDN line is captured by raising the handset of the key telephone that is displaying the call and the calling number stored in the calling number memory is called to the ISDN network. A configuration and means for delivering set to a constant information.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. Reference numeral 100 is a key telephone, 2 is a main unit of an electronic key telephone apparatus, 3 is a key telephone interface, 4 is a CPU that controls the entire key telephone apparatus, and 5 is information that is necessary for controlling the key telephone apparatus. RAM,
6 is a calling number memory provided in the RAM for storing the telephone number of the calling side, and 7 is a line interface for accommodating the S / T point interface of the ISDN line 1.
The CPU 4 can read out from the button telephone interface 3 whether the designated handset of the button telephone is on-hook or off-hook. FIG. 2 is a diagram showing an example of the contents of the calling number memory, which stores the calling number of an incoming call during a call corresponding to m telephones.

[0007] Now, the telephone number 04 to the button telephone 100 with the handset in the off-hook state via the ISDN line.
If there is an incoming call from 71-82-1111 (hereinafter abbreviated as calling number A), the information is notified to the CPU 4 via the line interface 7. Here, the CPU is shown in FIG.
The processing of the flow shown in is started.

First, the call setting information sent from the ISDN line is analyzed (process S1), and the presence or absence of the calling number is confirmed (process S2). If there is no calling number, it is unknown who the calling party is, and the process ends. If you have a calling number,
The calling number A is extracted from the call setting information (step S3). Next, it is checked whether or not there is a telephone that displays an incoming call (process S4), and if not, the process ends.

In this example, since the incoming call is to the key telephone 100, the telephone 100 is requested (step S5). Then, the key telephone number -100th, that is, the 0th address is obtained in the calling number memory (step S6). Then, the calling number A is set to the obtained address (process S7). This completes the setting of the calling number memory.

Next, in order to check whether or not each one of the key telephones housed in the key telephone unit is talking, that is, whether the handset is on-hook or off-hook, the CPU displays the state shown in FIG. Start the flow shown.

First, 0 is set to n in order to initialize the variable (process S8). The variable n indicates the number of key telephone sets. The variable n is compared with the number m of all button telephones (process S
9) If m is exceeded, it means that the states of the handsets of all the telephones have been checked, so the process ends, but if the variable n is less than m, the next process is performed. The nth content is read from the calling number memory (process S10), and it is checked whether the content is 0 (process S11).

If the corresponding content is 0, 100+
Since there is no incoming call to the n-th key telephone during the call, it is not necessary to check the state of the handset. Therefore, n is incremented by 1 to check the handset state of the next button telephone (step S15), but if it is not 0. For example, it indicates that there is an incoming call during a call, so the information of the telephone number 100 + nth handset is read from the button telephone interface (step S12).

Next, the state of the handset is checked (process S1
3) If it is off-hook, it is determined that a call is in progress and n is incremented by 1 to check the state of the handset of the next button telephone, but if it is on-hook, a display for notifying that there is an incoming call during the call The control data is sent to the telephone number 100 + n.

In this example, for the key telephone 100,
Control data for displaying "callback 0471821111" is transmitted (step S14), and n is incremented to check the next key telephone. With the above processing, when the key telephone set which receives an incoming call from the ISDN line during a call puts the handset in the on-hook state, a call back display is displayed on the display unit of the key telephone set.

After that, when the handset of the key telephone 100 is lifted up, the CPU starts the processing flow shown in FIG. The content of the button telephone number-100th is read out from the calling number memory (process S16), and it is determined whether it is other than 0 (process S17). If the content is 0, it means that there is no telephone number to call back, so the processing ends. If it is other than 0, it means that there is a call back destination, so the content of the calling number memory read to call the other party. Is set to the called number of the call setting information, that is, the telephone number of the call back destination (step S18), and is sent to the ISDN network (step S1).
9).

Since the operation for calling the other party is completed by the processing up to this point, in order not to call back again, the contents of the button telephone number of the calling number-100th number are 0.
Is set (process S20). As described above, it is possible to call back an incoming call during a call.

[0017]

As described above, the present invention is based on the ISDN.
When a call is received on the line, the call is returned based on the calling number in the call setting information sent from the line, and by displaying the phone number of the incoming call, it is possible to determine to some extent who the call was. There is an effect that it can be returned by a simple operation of raising the handset and that there is no need to make a call again even if the caller or callee is talking.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of a calling number memory of FIG.

FIG. 3 is a diagram showing a flow of processing of a CPU when an incoming call arrives on an ISDN line.

FIG. 4 is a diagram showing a flow of processing of a CPU when an incoming call arrives on an ISDN line.

FIG. 5 is a diagram showing a flow of processing of a CPU when an incoming call arrives on an ISDN line.

[Explanation of symbols]

 1 ISDN line 2 main device 3 button telephone interface 4 CPU 5 RAM 6 calling number memory 7 line interface 100 button telephone

Claims (1)

[Claims] 1. An electronic key telephone device having an ISDN S / T point interface and accommodating a key telephone having a display, in the call setting information sent from the network side when an incoming call is received on an ISDN line. And a means for writing the calling party number to the calling party number memory for storing the calling party number, which is the telephone number of the calling party, for each button telephone, and for writing the calling party number into the calling party number memory when the called key telephone is called. , A means for reading out the information written in the calling number memory when the key telephone is in a call and terminating the call, a means for displaying the read information on the display unit, and a button telephone which is displaying Means for capturing the ISDN line by raising the handset, and setting the calling number stored in the calling number memory to the ISDN network in the call setting information and sending it out. Electronic key telephone system to a butterfly.