JPH0575708A - Communication system and communication equipment - Google Patents

Abstract

PURPOSE:To constitute the equipment so that a terminal user who is executing a communication does not necessitate to receive a call having no relation, and also, a user who should receive actually an incoming receives its incoming call without being influenced by other user, and moreover, whether an incoming call can be transferred in the course of communication or not can be set. CONSTITUTION:A control part 106 compares a calling party number sent out of a calling party side in an incoming in the course of communication from an ISDN 11, with a calling party number stored in a memory l07, determines to receive or reject an incoming notice in the course of communication from a connecting circuit in accordance with a result of comparison, and executes control so that the connection can be executed only to the other party to which the incoming is permitted. Also, for instance, a display of an extension terminal which receives an incoming in the course of communication is controlled, and the control is executed so that extension terminals 113, 114, etc., can monitor a state of an incoming in the course of communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication apparatus and a communication system which accommodate a plurality of extension terminals and a plurality of outside lines and can accommodate at least one ISDN line of the plurality of outside lines, for example, an ISDN line. A communication method for receiving an incoming call to an appropriate terminal according to the terminal designation information of the incoming call during communication, or a connection terminal control for displaying an incoming call during communication to the terminal when a channel-less call setting message is received from the ISDN line The present invention relates to a communication device having a function or a communication device having a terminal function such as a telephone capable of displaying an incoming call during communication.

[0002]

2. Description of the Related Art CCITT Q.3 used in ISDN networks that have been rapidly spreading in recent years. One of the information elements of 931 recommendation is a channel identifier information element. This information element may be included in the call setup message and may come from the ISDN network with the information channel selection in the channel identifier information element indicated as "no channel". This means that the B channel controlled by the D channel of the ISDN line to which the call setup message has been transmitted is all used and is an incoming call when there is communication. ing.

Further, the call setting message includes various information elements for designating a terminal to receive a call. For example,
Destination sub-address information element, lower layer compatibility information element, etc. Conventionally, in the exchange, when all the B channels are in communication as described above, and when a call setting message of "no channel" is received, communication is performed by selecting from terminals using the B channel. I was sending an incoming call notification to the terminal.

In the past, for example, ISD was used as a local line.
In a private branch exchange accommodating N lines, when a terminal on the extension side is communicating with the network side of ISDN using each B channel of the ISDN line, if a new call setup message of "no channel" is received, The display of the incoming call during communication is displayed on all the terminals. Further, conventionally, a notification of an incoming call during communication to a telephone is unconditionally notified to a person to be notified because it is notified by a telephone line of an analog line like a telephone service.

Further, although there is no example in a communication terminal device such as a button telephone device used in an ISDN network, in a communication terminal device such as a conventional button telephone device accommodated in an analog network,
As is known in mobile phones, an audible signal is transmitted from the network when an incoming call is received from the same outside line during a call with an outside line, and when the inside line is hooked, the communication partner of the outside line is switched.

An example of the operation of a conventional communication system connectable to an ISDN line will be described below with reference to FIGS. 16 and 17. As shown in FIG. 16, the following description will be made on the communication network 10.
20 through the communication line 1021 to the communication processing device 1001
The system configuration in which the communication terminals 1031 and 1032 are connected will be described as an example.

A communication network capable of notifying an incoming call during communication, for example, I
In SDN, a control channel and an information channel are independent on a communication line, and communication is controlled by exchanging communication procedure information on the control channel. This conventional communication control will be described below with reference to the communication procedure of FIG.

Now, it is assumed that the communication terminals 1011 and 1031 connected to the communication processing apparatus 1001 are in communication (in use by the information channel of the communication line 1021a) as shown in FIG. In this state, the communication terminal 1032 sends the communication line 1021 to the communication processing device 1001 as shown in (b).
When a call is made by designating a, the communication network 1020 sends call setting information to the communication processing device 1. At this time, the communication processing device 1
The processing of 001 can be roughly divided into the four processings shown in c.

In the first processing shown in, the communication terminal 103
The communication with 1 is suspended and the communication terminal 1032 is responded (call waiting). In the second process indicated by, the communication with the communication terminal 1031 is disconnected and the communication terminal 1032 is connected. In the third processing shown in, the incoming call from the communication terminal 1032 is transferred. In the fourth processing shown in
It does not accept the incoming call from the communication terminal 1032.

[0010]

However, conventionally, the information for designating the terminal of the call setting message of the incoming call during communication does not correspond to all the terminals in communication, but corresponds to the extension terminal accommodated therein. Even if there is, it is necessary to make some notification to the communicating terminal, the notified terminal receives a notification unrelated to that terminal,
It is bothersome for the user, and the user of the terminal that actually received the call needs to have another terminal in communication perform operations such as disconnecting and holding to respond to the call. Yes, it was very inconvenient.

[0011] Further, since the display of the incoming call during communication is displayed to all terminals in communication, "no channel"
There is a drawback that even if the terminal is not able to perform normal communication with the transfer capacity specified by the transfer capacity information element in the call setting message, the incoming call display is displayed.
The user of the terminal is prompted to respond to a call that cannot perform normal communication, and if answered, the existing communication is interrupted by a call that cannot perform normal communication. .. In addition, there is a possibility that a terminal that can perform normal communication due to this response may interfere with the response to the display of the incoming call during communication.

Furthermore, since it is not possible to select whether to accept or reject the incoming call notification on the terminal side such as the telephone of the person to be notified, when the notification is given, it is necessary to respond without fail. There were the following drawbacks. (1) Temporary calls must be interrupted even during important calls. (2) Since an incoming call notification during communication is given to a prank call or the like, it is necessary to respond to these notifications.

Further, in the conventional key telephone device, there is a case where the user cannot hear the call only by the audible signal when there is an incoming call during communication, and it takes time to surely recognize that the caller is called by the third party. In other words, if you switch the caller several times by hooking, you may not know who was talking first, and a busy tone is sent when you switch because you cannot detect the disconnection of the waiting person. There was a problem such as being lost.

Furthermore, in the above-mentioned methods and
When the user does not want to interrupt or disconnect the communication with the communication terminal 1031, it cannot cope well. With this method, you must have a proper destination to forward. This method is the same as not using the incoming call notification service after all.

[0015]

The present invention has been made for the purpose of solving the above-mentioned problems, and has the following structure as one means for solving the above-mentioned problems. That is, a communication system for accommodating a plurality of extension terminals and a plurality of outer lines, capable of accommodating at least one ISDN line of the plurality of outer lines, and performing the incoming call processing during communication, the outer line I
Call setting message receiving means for receiving a call setting message of call 1 from the network via the SDN line, and if call 1 is recognized as an in-communication incoming call when the call setting message is received by the call setting message receiving means, A terminal specifying information checking means for checking the terminal specifying information in the call setting message of 1;
When there is an extension terminal that does not correspond to all the extension terminals that are communicating through the ISDN line that has arrived and the other accommodated extension terminal corresponds to the terminal designation information in the call setting message of call 1, call 1 And an incoming call control means for making an incoming call to an external line different from the external line ISDN line to which the call 1 accommodated by the device is received.

Alternatively, there is provided a communication device which accommodates at least one or more ISDN lines and a plurality of transmission lines connected to terminals, and which can physically connect the B channels of the ISDN lines to the transmission lines, each transmission line being Attribute storage means for storing the attributes of the terminal to be connected, transfer capacity storage means for recognizing and storing the transfer capacity information element in the received call setting message from the accommodated ISDN line, and "channel-less" message reception from the accommodated ISDN line Of the message receiving ISDN line based on the information stored in the transmission capacity storing unit and the attribute storing unit when the detecting unit detects the message reception of "no channel" through one ISDN line of the stored ISDN line. Select the terminal that displays the incoming call during communication from the terminals connected to the transmission path connected to one or more B channels. Comprising a-option unit, and incoming display means for display during the communication call to the selected terminal in said selection means.

Furthermore, a plurality of extension terminals and a plurality of outside lines are accommodated, and at least one or more ISDN lines out of the plurality of outside lines are accommodated.
In a communication device that can receive an incoming call notification during communication that can be connected to a digital line from a switching device that can accommodate the line,
Sending caller number storage means for storing the caller number sent from the caller side, input caller number storage means for storing the caller number input from the operation input unit, and input call Comparing means for comparing the calling party number with the calling party number,
And a reception unit that receives an incoming call notification from the connection line according to the result of the comparison by the comparison unit. Then, for example, the input calling party number storage means stores the calling number of the other party who should receive the incoming communication notification, and the reception means notifies the notified person when the calling number of the other party who should receive the incoming communication notification is received. The control to notify the incoming call during communication, or the reception means is only for the call of a specific caller number that is registered in advance, the call to the specified extension or the input caller number storage means The calling number of the other party who rejects the incoming communication notification is stored, and the reception means does not notify the notified person when the calling number of the other party who rejects the incoming communication notification is received.

Furthermore, in a communication device such as a key telephone device accommodated in the ISDN network, a first detecting means for detecting an incoming call notification from the ISDN network and a second detection means for detecting an abandonment of the incoming call. Means, a response means for responding to an incoming call during extension, a switching means for switching a communication partner to the ISDN network, and a third detecting means for detecting a disconnection signal of the communication partner before switching from the ISDN network. Means and
The first display is displayed when a call is being made to the extension, the second display is displayed when an incoming call notification is detected, and the first display is displayed when an abandoned call is detected during communication. The third display is displayed when the incoming call is answered, and the fourth display if the third display is displayed when the call partner is switched.
Is displayed, the third display is performed if the fourth display is in progress,
When the disconnection signal of the other party before switching is detected, the first
Display control means for displaying

Further, at least the calling party number is included in the communication procedure information, the control channel and the information channel are independently provided on the line, and even when the information channel is in use, it is confirmed that there is an incoming call to the line in use. A communication device capable of notifying by communication procedure information on the control channel, a terminal connecting means for connecting and accommodating a plurality of communication terminals, a control means for controlling a display device of the accommodating communication terminal in the terminal connecting means, and communication Calling party number holding means for holding a calling party number included in the received communication procedure information when receiving communication procedure information indicating an incoming call, and the calling party number holding means when a call during communication is completed The automatic call means for automatically making a call to the other party who has received a call during the held communication.

[0020]

In the above configuration, the terminal user who is communicating is
There is no need to receive unrelated calls, and the effect is that the user who should actually receive the call can receive the incoming call without being affected by other users. Furthermore, whether or not to transfer the incoming call during communication can be set. By doing so, there is an effect that various applications can be realized.

Among terminals connected to a transmission line connected to one or more B channels of the ISDN line, terminals capable of normal communication with the transmission capacity designated by the transmission capacity information element in the call setting message It is possible to display the incoming call only during communication. In other words, when a call setup message of "No channel" is received, by displaying the incoming call in progress only to the terminal corresponding to the delivery capability of the call setup message, a terminal that cannot perform normal communication due to the delivery capability is displayed. There is no need to receive an indication of an incoming call during communication, and a response to such a call will not be prompted.

Further, in the above configuration, since the incoming call notification during communication can be selected and received, it is not necessary to suspend the communication due to unnecessary requirements during the communication of important requirements, and prank call etc. It becomes unnecessary to respond to the incoming call notification during communication by. Also, for the extension, the first display is displayed during a call, the second display is displayed when an incoming call notification is detected, and the first display is displayed when an abandonment of incoming call is detected. , The third display is made when a response to an incoming call during communication is made, the fourth display is made if the third party is being displayed and the third display is made if the fourth party is being displayed when the communication partner is switched. Is displayed, and when the disconnection signal of the other party before switching is detected, the first display is displayed, etc. By displaying each status related to the incoming call during communication, the incoming call during communication can be recognized quickly and the current call The other person can see at a glance,
Further, there is an effect that it is possible to recognize that the other party who has been waiting has been disconnected, and to smoothly operate the incoming call during communication.

Furthermore, when the communication procedure information indicating an incoming call is received during communication, a means for holding the calling party number included therein, and a party receiving the incoming call during communication when the call during communication is terminated. Even if there is an incoming call during communication, the communication can be formed without interrupting / disconnecting the communication with the current communication partner and without missing a new communication request. The effect that can be obtained is obtained.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described in detail below with reference to the drawings.

[0025]

[First Embodiment] A first embodiment according to the present invention with reference to FIGS.
An example will be described first. FIG. 1 is a diagram showing the overall configuration of a first embodiment according to the present invention. In FIG. 1, 11 is an ISDN accommodated as an external network by the device, 12 is a control unit for controlling various service interface terminals of the device, 13 is a ROM containing various control programs,
Reference numeral 14 is a RAM holding various setting data, 15 is an exchange unit, 16a and 16b are ISDN external line interfaces accommodating ISDN basic interfaces, 17
Reference numerals a, 17b and 17c are extension interfaces accommodating extension terminals, and 18a, 18b and 18c are extension terminals, and in the present embodiment, telephones are respectively connected as extension terminals.

The in-communication incoming call processing of the first embodiment having the above configuration will be described below with reference to the flow charts of FIGS. FIG. 2 is a flowchart of a process for setting whether to transfer an incoming call during communication, and FIG. 3 is a flowchart of a process for incoming call during communication. First, the in-communication incoming call transfer permission setting processing in this embodiment will be described with reference to FIG.

First, in step S1, it is monitored whether the incoming call setting special number during communication is input from any of the telephones 18a to 18c which are extension terminals. And the telephones 18a-18
When the special number for setting the incoming call during communication is input from any one of c, the process proceeds to step S2, and it is checked whether or not the setting code input subsequently is a transferable code. If the input code is a transfer-enabled code, the flow advances to step S3 to set "transfer-enabled" and end the setting.

On the other hand, if the input code is not a transfer-enabled code but a transfer-disabled code, the process proceeds from step S2 to step S4 to set "transfer disabled" and finish the setting. Through the above processing, it can be arbitrarily set from the telephone set whether or not the own telephone can set the incoming call during communication.

Next, referring to FIG. 3, the in-communication incoming call processing in this embodiment will be described. In the communication process, first, in step S11, it is monitored whether an incoming call from the ISDN arrives at this device. When an incoming call from the ISDN is detected, the process proceeds to step S12, and it is determined whether the incoming call is an incoming call during communication, that is, whether the channel identifier in the call setting message indicates "no channel". If the incoming call is not an incoming call during communication, the process proceeds to step S13 to perform a normal incoming call process, select a connected terminal according to the incoming call from the ISDN, call it, and enable communication.

On the other hand, when it is recognized that the incoming call is during communication, the process proceeds to step S14. For example, in FIG.
One of the B channels of the basic interface accommodated in the DN interface 16a is connected to the extension terminal 18a.
However, when the extension terminal 18b is communicating using the other B channel, a call setting message is further transmitted to the ISDN interface 16a. In this case, it is checked whether the extension terminal corresponding to the terminal designation information included in the call setup message received in step S14 is communicating through the ISDN line that received the call setup message. If the corresponding terminal is communicating through the incoming line, the process proceeds to step S15, where a normal incoming call process such as incoming call to the terminal is performed.

On the other hand, when there is no terminal corresponding to the terminal communicating on the incoming line, the process proceeds to step S16 to check whether or not there is another corresponding terminal. If there is no other corresponding terminal, the process proceeds to step S17 to release the incoming call and terminate the process. On the other hand, when there is another corresponding terminal, for example, in FIG. 1, the subaddresses of the extension terminals 18a and 18b that are communicating through the outside interface do not match the called subaddress of the incoming call, but they match the subaddress of the extension terminal 18c. If so, proceed to step S18,
The in-communication incoming call transfer availability setting set by the above-described in-communication incoming call transfer availability setting process is checked. If "transfer not possible" is set for the transfer of the incoming call during communication, the process proceeds to step S20 to perform a busy process.

On the other hand, if "transfer allowed" is set, the flow advances to step S19 to search for an extraneous line. If there is no extraneous line, the process proceeds to step S20 to perform a busy process. If there is an outside line, step S2
The process proceeds to step 1 and the call transfer process for the call that has arrived first is started for the outside line, and the process ends.

In the above-described embodiment, the example in which the busy process is performed when the call transfer during communication is disabled is described. However, the present invention is not limited to the above example, and naturally displaying on a corresponding terminal is also included in the scope of the present embodiment. In addition, it goes without saying that displaying to that effect on the terminal during communication is also included in the scope of the present invention. Furthermore, waiting for an incoming call, 1
It is also possible for one terminal to process a call that has been waiting immediately after disconnection and release, in the same manner as a normal incoming call.

As described above, according to this embodiment, I
During communication in SDN When the terminal specification information of the incoming call does not correspond to the terminal communicating on the incoming line, and there is a corresponding terminal in the accommodation extension terminals, the call is transferred by performing the call transfer. The terminal user does not need to receive an unrelated call, and the user who should actually receive the call can receive the incoming call without being affected by other users. Further, by setting whether or not to transfer the incoming call during communication, various applications can be realized.

[0035]

[Second Embodiment] A second embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 4 is a diagram showing the configuration of the second embodiment according to the present invention. In FIG. 4, 11
Is an ISDN, 101 is a private branch exchange, 102 is an ISDN office line interface that accommodates an ISDN line as an external line,
Reference numeral 103 is a telephone interface, 104 is a data terminal interface, 105 is a communication path, 106 is a central control unit that controls the entire private branch exchange 101 including control of the respective interfaces 102, 103, 1044 and the communication path 105, and 107 is A memory 109 is an IS housed in the private branch exchange 101 by an ISDN office line interface 102.
ISDN line of DN basic interface, 110, 11
Reference numerals 1 and 112 denote B1 channels, B2 channels and D channels of the ISDN line 109, 113 denotes a telephone, and 11
4 is a data terminal, and 115a and 115b are telephones 11.
3 and the data terminal 114 are connected to the private branch exchange 101, and the private branch exchange 10 is connected by the interfaces 103 and 104.
1 is an extension transmission line accommodated in 1; 116 is an area A in the memory 107 for storing transmission capacity; 117 is a B1 channel 11;
Areas B and 118 in the memory 107 for storing terminals that are communicating via the B. 1 and B2 channels 112 are memories 1 for storing attributes of extension terminals connected to the private branch exchange 101.
Areas C and 119 in 07 are processing units A and 120 that perform processing relating to a "no channel" call setting message received via the D channel 112 of the ISDN line 109, and processing 120 that relates to selection of a terminal that displays an incoming call during communication. It is a processing unit B for performing.

The operation of the second embodiment having the above configuration will be described with reference to the flow chart of FIG. In the second embodiment, it is assumed that the attributes of all the terminals connected to the private branch exchange 101 are stored in the area C118 in advance. For example, information that a telephone is connected to the extension 115a and a data terminal is connected to the extension 115b is stored.
Then, for example, the telephone 113 is B of the ISDN line 109.
If the data terminal 114 is communicating using the B2 channel 111 of the ISDN line 109 and the ISDN is connected to the ISDN in the area B117.
The terminal that is communicating using the line 109 is the telephone 1
13 and data terminal 14 are stored.

In the present embodiment, FIG.
The process of step S51 is executed and the reception of the call setting message of "no channel" is monitored.
When the call setup message of "no channel" is not received, normal communication processing is continued. And IS during communication
When the call setting message of "no channel" is received via the D channel 112 of the DN line 109, the process proceeds from step S51 to step S52, and the processing unit A120 stores the transmission capability information element of the received call setting message in the memory 1
The data is stored in the area A116 of 07. In the subsequent step S53, the processing unit B21 sets 0 in the built-in counter i and stores it in the flag B in the area B117 as an initial setting for performing the processing described later for all terminals in communication stored in the area B117. Stores the number of terminals currently in communication. Then, in step S54, the counter i is incremented by one. In the subsequent step S55, the area C11
The attribute of the terminal i stored in 8 is read out, and step S
Proceed to 56. In step S56, it is determined whether the read attribute of the terminal i can be normally communicated based on the transmission capability stored in the area A116. If normal communication is not possible due to the read capability of the terminal i stored in the area A116, step S5 is performed.
In step 8, it is checked whether the count value of the counter i is smaller than the flag n, that is, whether there is a communication terminal that has not been checked. If there is a communication terminal that has not been checked yet, the process returns to step S54 to check the next communication terminal. If there is no communication terminal that has not been checked yet, the process ends.

On the other hand, the terminal i read in step S56
If normal communication is possible due to the transfer capability stored in the area A116, the process proceeds to step S57, and an incoming call display is displayed on the terminal that can communicate. Then, the process proceeds to step S58.

In this embodiment, since the terminals are the telephone 113 and the data terminal 114, for example, when the information transfer capability of the transfer capability information element is voice, the telephone 113 displays an incoming call during communication, and the data terminal 114 displays. Do not display incoming call during communication. When the information transfer capability of the transfer capability information element is an unrestricted digital, the telephone 113 does not display an incoming call, but the data terminal 114 displays an incoming call.

As described above, according to this embodiment, for example, when a telephone and a data terminal are connected to the extension of the private branch exchange and communication is being performed using different B channels of the same ISDN line, The terminal does not perform normal communication While receiving a call, it does not have to be displayed as an incoming call, and there is no need to worry about interrupting existing communication in response to such a call. There is an effect that it is possible to respond to the display of the incoming call during communication without being disturbed by the terminal.

As another similar embodiment, the same effect is obtained when the extension side terminal of the second embodiment is expanded to not only the telephone and the data terminal but also all terminals capable of accepting an incoming call. Obtainable. Similarly, the present invention is not limited to the case where the ISDN line is used as the basic interface, and the same effect can be obtained by the same operation even in the case of the primary group interface and other interfaces.

Further, when the present invention is applied not only to a private branch exchange as a communication apparatus for carrying out the present invention but also to a terminal adapter (TA), the same operation is performed by replacing the communication path 105 in FIG. 4 with a switch. The same effect can be obtained with. As described above, when a “channel-less” call setting message is received, normal communication is displayed in terms of transfer capability by displaying the incoming call during communication only to the terminal corresponding to the transfer capability in the call setting message. The terminal that cannot perform the call does not receive the display of the incoming call during communication and is not prompted to answer such a call.

Although the above description has been made with respect to the communication of the ISDN line, this is the INS64 of NTT.
It is not limited to public services such as the INS1500 and the INS1500, but the extension side of the PBX (for example, C
The same can be done for the communication device of the present invention connected to the S-point interface defined by CITT).

[0044]

[Third Embodiment] Next, a third embodiment of the present invention will be described in detail with reference to FIGS. FIG. 6 is a block diagram showing a third embodiment according to the present invention. In FIG. 6, 10
Reference numeral 20 is a communication network similar to the communication network shown in FIG. 16 described above, and is actually ISDN. Reference numeral 201 denotes a communication processing device which is the center of control in the communication processing system of the third embodiment, and here is a second processing device which accommodates a plurality of outside lines and extension lines.
The telephone exchange apparatus has a configuration substantially similar to that of the embodiment. However, the control of the control device 205 is mainly different in the third embodiment. An extension terminal 211 is housed in the communication processing apparatus 201 and has a display device 212. 22
1 is a communication line connected to the communication network 1020, 103
Reference numerals 1 and 1032 denote other communication terminals connected to the communication network 1020.

In the communication processing device 201, 202 accommodates a line 221 of a communication network 1020 which is a communication network capable of notifying an incoming call during communication, an ISDN interface which controls the interface with the communication network 1020, and 203 an external line / extension line. A call path switch for exchanging / connecting a call path between the two, reference numeral 204 is an extension interface that controls the interface with the extension terminal 211, and controls the call path connection with the extension terminal 211, control of the extension terminal 211 by data communication, etc. Do. 20
Reference numeral 5 is a control device which is stored in the ROM 207 and is constituted by a microprocessor or the like for controlling the overall control of the communication processing device 201 of the third embodiment according to the control procedure shown in FIG. RA that stores the calling party number and holds information for operating this system
Reference numerals M and 207 are ROMs for holding control procedure programs and the like in the control device 205.

The characteristic operation of the third embodiment having the above construction will be described below with reference to the flow chart of FIG.
In the following description, it is assumed that the extension terminal 211 is communicating with the communication terminal 1031, as in the example described in the section of the related art.
At this time, a case will be described as an example where the communication terminal 1032 makes a call to the line in communication (to the extension terminal 211).

At this time, the control unit 205 shifts to the processing of step S61 of FIG.
It is monitored whether the DN interface 202 detects an incoming call from the communication network 1020 to the communication line. If the incoming call to the line during communication is not detected, the process during communication is continued. Here, the ISDN interface 202 is the communication network 1
When an incoming call from 020 to the line under communication is detected and communication control information (call setting) from the communication network is received, the process proceeds to step S62, and the calling party number included in the call setting is stored in the RAM 206.

Then, in step S63, the extension terminal 21
In order to notify the user of No. 1 that there is an incoming call, the extension terminal 21 is notified via the extension interface 204.
The display device 212 of No. 1 is controlled to display that effect.
Then, in step S64, the ISDN interface 20
Instructing No. 2 to control not to accept this incoming call during communication but to reject it. After that, in step S65, the process waits until the call currently being communicated ends. At this time, other in-communication processing is performed in parallel, but for simplification of description, it is shown here as a step for monitoring the end of the call during communication. When the end of the call being communicated is detected in step S65, the process proceeds to step S66, and the ISDN interface 202 is restarted in step S62 to notify the other party who is receiving the call based on the caller number stored in the RAM 206. Calls automatically without user operation. After that, the process shifts to a normal process during normal communication.

As described above, according to the third embodiment,
When receiving communication procedure information that indicates an incoming call during communication, a means for holding the calling party number included in it and automatically calling the other party who received the call during communication when the call during communication ends By providing the means for performing communication, even if an incoming call is received during communication, it is possible to form communication without interrupting / disconnecting the communication with the current communication partner and without missing a new communication request. ..

The present invention is not limited to the above-mentioned third embodiment, and various modifications can be made. For example, in step S66 of FIG. 7, after the end of the call during communication,
Instead of making a call immediately, it may be made after a certain period of time. In this case, the time until the automatic call is set in advance in the timer 208, and step S6
After the end of the call during communication in 5 is detected, the timer 208 may be started, and after the timer setting time has expired, the automatic call may be made.

[0051]

[Fourth Embodiment] A fourth embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 8 is a block diagram of a telephone device implementing a fourth embodiment of the present invention, and FIG. 9 is a fourth block diagram.
9 is an operation flow chart when an incoming call notification is received during communication in the embodiment. The fourth embodiment is applicable to the extension terminal of each of the above-described embodiments, and is an example in which the present invention is applied to, for example, a digital telephone that can be connected to the extension interface of the exchange unit 15 of the first embodiment.

In FIG. 8, numeral 300 indicates the fourth portion according to the present invention.
The telephone device 310 of the embodiment is a telephone device 300 of the fourth embodiment.
Is a digital telephone line connected to each other, for example, a D channel which is a data channel of B1 and B2 and a control channel which is connected to the switching unit 15 and the like via the extension interface 17 of the first embodiment described above. is doing. Reference numeral 311 is a data output terminal connected to the telephone device 300.

In the telephone device 300, 301 is a channel demultiplexing circuit, 302 is a CODEC, 303 is a sound source,
304 is a handset, 305 is a memory for storing a calling party number, 306 is a CPU that controls the entire telephone apparatus 300 including comparison of calling party numbers, which will be described later, 307 is a speaker,
Reference numeral 308 is a display unit and 309 is a key input unit. The operation of the fourth embodiment having the above-mentioned configuration when the incoming call notification is received during the communication will be described below with reference to the flow chart of FIG.

In the following description, the in-communication incoming call setting special number of the key input unit 309 is input by the above-mentioned in-communication incoming call transfer permission setting processing in FIG. 2 of the first embodiment, for example. Performed when "Transfer allowed" is entered. In this case, the key operation of the key input unit 309 is also performed to store the calling party numbers of a plurality of parties who accept the incoming call notification in communication in the memory 305.

Then, it is assumed that an incoming request is further made in a state where it is already in communication with another communication terminal. At this time, B1,
When both channels of B2 are in communication, the incoming notification of communication is transmitted from the D channel. When this incoming communication notification is sent, the processing of the CPU 306 shifts to the processing shown in FIG. First, in step S71, the calling party number of the caller included in the incoming call notification during communication is stored in the memory 305. Subsequently, the CPU 306 determines in step S72 to step S74 the caller number of the caller specified in the communication incoming call notification and the caller number of the other party who accepts the plurality of communication incoming call notifications already stored in the memory 305. The process of comparing and is performed.

That is, in step S72, the caller number of the other party who accepts the first incoming call notification of the plurality of caller numbers of the other party who accepts the plurality of incoming call notifications that are preset and registered from the memory 305 in step S72. Read out. And step S7
In step 3, the calling party number of the other party who accepts the read communication incoming notification is compared with the calling party number of the calling party stored in step S71. As a result, if the calling numbers do not match, the process proceeds to step S74, the calling party number of the other party who accepts the next incoming call notification in the memory 305 is read, and the calling party number comparison processing in step S73 is performed again. Do.

Continuing the matching process in step S73, if none of the registered caller numbers of the other party who accepts the incoming call notification of the registered one matches the received caller number, the process proceeds to step S75, and the digital line is connected. A message indicating that the incoming call notification is rejected is output to 310, and the in-communication process is continued without issuing the in-communication notification from the sound source 303.

On the other hand, as a result of comparison, if the calling party number of the accepting party stored in the memory 305 and the received calling party number match, the process proceeds to step S76 and the CPU 3
06 activates the sound source 303, instructs the handset 304 during communication to output an incoming call notification, and then performs step S77.
The in-communication incoming call notification is output from the handset 304 during communication. By the above procedure, only the incoming call request of the other party who accepts the incoming call notification stored in the memory 305 can be notified to the notified party, and the incoming call request from the caller who rejects the acceptance disturbs the communication. It will not be done.

As described above, according to the fourth embodiment,
Storage means for storing the calling party number sent from the calling party side, storage means for storing the calling party number input from the telephone device input section, and comparing means for comparing the former and latter calling party numbers By providing means for selecting whether to accept or reject the incoming call notification during a call, the following effects can be expected. (1) Since the incoming call notification during communication can be selected and received, there is no need to suspend communication during unnecessary communication due to unnecessary requirements. (2) It becomes unnecessary to respond to the incoming call notification during communication by a prank call or the like.

[0060]

[Fifth Embodiment] In the above-mentioned fourth embodiment, the telephone device has no switching function. However, the present invention is not limited to the above example, and the same function has a switching function, and is also effective in a telephone device that accommodates one or more outside lines and has two or more extensions.

FIG. 10 shows that a similar function has an exchange function.
FIG. 11 is a block diagram of a telephone device having a switching function of a fifth embodiment according to the present invention, which is applied to a telephone device having the above-mentioned external lines and having two or more extension lines. Hereinafter, a fifth embodiment of the present invention will be described in detail with reference to FIG. In FIG. 10, reference numeral 321 is an extension telephone, 322 is a channel demultiplexing circuit, 323 is a memory for storing a calling party number, 324 is a central control unit for controlling the entire apparatus of this embodiment including comparison of calling party numbers ( CPU), 325 is a central control circuit for performing exchange control, 326 is a memory, 327 is a communication path switch, 3
28 is an extension interface and 329 is a digital line.

Also in the communication incoming notification of the fifth embodiment having the above-mentioned configuration, the CPU 325 as the central processing unit carries out the incoming communication processing according to the control procedure shown in FIG. 9 similarly to the CPU 306 of the fourth embodiment. Since this control procedure is the same as that in FIG. 9, illustration is omitted. That is, also in the fifth embodiment, similarly to the fourth embodiment, an incoming call request is made in a state where the memory 326 stores the caller numbers of a plurality of callers who accept the incoming call notification during communication by key input on the extension telephone 321. The following explanation will be made assuming a case.

In the processing of the CPU 325, B1, B2
In the case where both channels are communicating, when the incoming communication notification is transmitted from the D channel, the processing shifts to the processing in FIG. In this case, first, the calling party number of the calling party is stored in the memory. Then, the CPU 325 compares the calling party number of the calling party with the calling party number of the other party who accepts the plurality of incoming communication notifications already stored in the memory 326. as a result,
If it matches the calling party number of the accepting party already stored in the memory, the central control unit is instructed to notify the extension telephone of the called party that the incoming call is received. If they do not match, the CPU does not command the central control unit.

Even in the telephone device having the exchange function according to the above-described procedure, only the incoming call request of the other party who accepts the incoming call notification during communication can notify the notified person who is using the extension telephone. Similarly, after this notification, it is easily possible to make an incoming call to a specific extension, while only a call having a specific calling number is important.

[0065]

[Sixth Embodiment] In the fourth and fifth embodiments,
The embodiment of the means for receiving the incoming call notification during communication has been described when the calling party number sent from the calling party side and the calling party number input from the telephone device input unit match. However, the present invention is not limited to the above example, and when the caller number sent from the caller side and the caller number input from the telephone device input section match, the communication incoming notification is given. The same effect can be obtained when the means for refusing is used.

A sixth embodiment according to the present invention having the above-described structure will be described below with reference to the flow chart of FIG. Also in the sixth embodiment, the configuration of the telephone device may be the same as that of the fourth embodiment shown in FIG. 8 or the fifth embodiment shown in FIG. 10, and the description of the configuration will be omitted. FIG. 11 shows, for example, by the key operation from the key input unit 309 shown in FIG.
7 shows a flow chart when an incoming call request is received in a state where a plurality of caller numbers of the other parties who reject the incoming call notification during communication are stored in a memory.

In FIG. 11, the same steps as those in FIG. 9 described above are designated by the same step numbers, and detailed description thereof will be omitted. In FIG. 11, for example, by key operation from the key input unit 309 shown in FIG. 8, the caller numbers of a plurality of callers who reject the incoming call notification during communication are set and input, and the incoming call request comes in the state registered in the memory 305 or the like. It shows the flow chart at the time of standing.

It is assumed that an incoming call request is made by operating the keys of the key input unit 309 while a plurality of caller numbers of the other parties who reject the incoming call notification are stored in the memory. At this time, if both channels B1 and B2 are communicating,
Incoming call notification is sent from D channel. In this case, the calling party number of the caller is stored in the memory 305 by the same process as in step S71 of FIG. 9, and in the following steps S81 and S82, unlike the steps S72 and S73 of the above-described embodiment, the CPU 306 sends the caller's caller number. The calling party number and the calling party number of the other party who rejects the plurality of incoming communication notifications already stored in the memory 305 are compared. Other processes are the same as those in FIG. As a result, the memory 30
If the calling party number of the other party to be rejected stored in No. 9 does not match, the incoming call notification is transmitted to the handset 304 through the sound source 303. If they match, the CPU 306 does not notify the sound source 303.

In the above-described procedure, the incoming call request of the other party who rejects the incoming call notification stored in the memory 305 can be prevented from being notified to the notified person. Even if configured as described above, a storage means for storing the caller number sent from the caller side, a storage means for storing the caller number input from the telephone device input section, the former and the latter By providing a comparison means for comparing the calling party numbers of the two and a selection means for deciding whether or not to reject the incoming call notification, it is possible to select and receive the incoming call notification. The effect is that there is no need to suspend communication due to necessary requirements.

[0070]

[Seventh Embodiment] The above description is mainly about the control of whether or not to display the fact that there is an incoming call during communication, and when the incoming call during communication is not displayed, There was no notification that there was an incoming call during this communication. However, the present invention is not limited to the above example, and naturally displaying various correspondence situations for incoming calls during communication is also included in the scope of the present invention.

Hereinafter, a seventh embodiment according to the present invention for displaying various correspondence states for incoming calls during communication in a graspable manner will be described with reference to FIG.
~ It demonstrates with reference to FIG. FIG. 12 is a system configuration diagram of a seventh embodiment according to the present invention. In the figure, 401 is a main device of a button telephone device, 407 _{1 to} 407 _n are lines connected to a line network, and 408 _{1 to} 408 _n are A key telephone, which is an extension terminal connected to the extension, and 420 is a line network, which is constituted by ISDN in this embodiment. Also,
421 to 423 are communication terminals connected to the line network 420.

In the main unit 401 of the key telephone unit,
Reference numeral 402 denotes a CP which is stored in the ROM of the memory 403 and which controls the entire apparatus in accordance with, for example, the control procedure shown in FIG.
U and 403 are memories including a ROM in which a program for controlling the operation of the CPU 402 is stored and a RAM for reading / writing various information, and 404 is a line 40.
7 is a speech network for controlling the connection of the communication path between the telephone 7 and the telephone 408, and 405 is a line interface for controlling the interface with the line 407, and sends and receives signals to and from the line network 420 via the line 407. An extension interface 406 controls the interface with the telephone 408, and transmits and receives signals to and from the telephone 408.

FIG. 1 shows the logical configuration of the above-mentioned line 407.
13 is a diagram shown in FIG. 3, and 407-B1, 40 in FIG.
Reference numeral 7-B2 is an information channel (B channel), both of which a voice signal is transmitted, and 407-D is a control channel (D channel) to which a control signal such as an incoming / outgoing call is transmitted.

FIG. 14 shows the appearance of the above-mentioned telephones 408 _{1 to} 408 _n . In FIG. 14, 409 is an indicator (LCD) that displays the telephone number of the other party when receiving a call, and 410 is an illuminated external line button used to display the status of the line and to supplement the line, corresponding to the information channel of each line. The processing status of the incoming call display during communication is also displayed. Reference numeral 412 denotes a handset for making a call, 41
Reference numeral 3 is a dial key portion for inputting a telephone number of a call destination.

The control when there is an incoming call during communication in the seventh embodiment having the above configuration will be described below with reference to the flow chart of FIG. FIG. 15 shows the CP of the seventh embodiment.
FIG. 3 is a flow chart showing an incoming call operation during communication of U402, in which the telephone 408 ₁ is in a call with an outside line partner (for example, the communication terminal 421) via the speech network 404 and the information channel 407 ₁ -B1 of the line 407 ₁ . Further, the operation of the telephone 408 ₂ will be explained according to the flow chart from a state in which the telephone 408 ₂ is in a call with the other party (for example, the communication terminal 422) of another outside line via the speech network 404 and the information channel 407 ₁ -B2 of the line 407 _1. ..

During execution of the normal communication process, the process of step S401 is periodically executed to check whether there is an incoming call during communication. If there is no incoming call during communication, the normal incoming call process is continued without performing the process of FIG. In the above-described state, for example, the communication terminal 4 from the line network 420 via the control channel 407-D.
When there is an incoming call notification from the telephone 23 to the telephone 408, the process proceeds from step S401 to step S402 to activate the line interface 405 and send a call request signal to the line network 420 via the control channel 407-D. Then, in step S403, the extension interface 406 is activated,
LCD4 of telephone 408 specified from the incoming call notification during communication
The other party who has newly arrived at 09 (for example, the communication terminal 42
Control to display the telephone number of 3). at the same time,
The display of the corresponding outside line button of the telephone, for example, the illuminated outside line button 410-B1 is controlled so as to change from the normal green state, which is the normal busy state display, to the fast blinking green display.

Then, in a succeeding step S404, a partner (communication terminal 42) newly receiving a call from the circuit network 420 in response to the calling request signal transmission in the step S402 is first performed.
It is checked whether or not a disconnection signal indicating the abandonment from 3) is detected. When the disconnection signal is detected, the process proceeds to step S405, the other party number on the LCD 409 of the telephone 408 is erased,
The display of the outside line button 10-B1 is again turned on normally in green, which is a normal call display, and the process returns to step S401.

On the other hand, if the disconnection signal is not received in step S404, the process proceeds to step S406, and it is checked whether or not there is hooking from the telephone 408 via the extension interface 406 during the incoming call. When there is no hooking, the process returns to step S404, and the hooking is detected or the detection of the disconnection signal from the incoming call requesting device during communication is monitored.

When the hooking of the handset 412 is detected, the process proceeds from step S406 to step S407 to send a response signal to the line network 420 in response to the incoming call, and at the subsequent step S408, the LCD 4 of the telephone 408 is sent.
In 09, a message indicating that a call is being made with a new partner (communication terminal 423) is displayed, and the display of the outside line button 410-B1 is made to blink red slowly to display that the call partner has been changed.
Then, in step S409, it is checked whether the extension interface 406 has detected hooking as in step S406. If the hooking is not detected during the communication, the process proceeds to step S410, and it is checked whether or not the other party waiting during the switching call is disconnected. If the other party waiting during the switching call is not disconnected, step S409
Return to and watch for hooking or disconnect detection.

In this state, a disconnection signal is sent from the line network 420 to notify that the other party waiting during the switching call is disconnected, and when the line interface 405 detects the reception of this signal, the step S410 is executed. The process proceeds to step S411, and the outside line button 410-B of the telephone 408 is used.
1 is controlled to the green lighting state, and the display returns to the normal calling state. After that, the normal call processing is performed.

On the other hand, step S409 and step S41
The telephone 408 that is switching the call during the loop processing of 0
When the hooking is detected from step S409, the process proceeds from step S409 to step S412, the line interface 405 is activated, a switching signal of the call partner is sent to the line network 420, and the call control with the communication partner waiting for the call is started. In the present embodiment, since the display is changed depending on the other party who is currently talking, it is checked in step S413 whether the other party is the communication terminal 421 or the communication terminal 422, for example. Then, for example, when the communication with the communication terminal 421 is in progress, the process proceeds to step S414 to instruct the outside line button 410-B1 of the telephone 408 to be displayed in slow blinking green, and the process returns to step S409.

On the other hand, when the communication with the communication terminal 422 is in progress, the process proceeds to step S415 to instruct the outside line button 410-B1 of the telephone 408 to be displayed in red slow flashing, and the process returns to step S409. As described above, according to the seventh embodiment, by displaying each state related to the incoming call during communication, the incoming call during communication can be recognized quickly, and the other party who is currently talking can be seen at a glance and the other party who has been waiting. There is an effect that the disconnection can be recognized and smooth operation regarding incoming calls during communication can be performed.

In the above description, the response to the incoming call during communication and the switching operation of the call partner are performed by hooking, but they may be performed by pressing another button, for example, an outside line button. Further, although the display on the telephone is performed by the LCD and the outside line button, the tone interface may be displayed together by controlling the extension interface when the state changes. As described above, it goes without saying that any method of displaying the fact that there is an incoming call during communication and the state of the incoming call by the telephone in a recognizable manner is included in the scope of the present invention.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0085]

As described above, according to the present invention, the terminal user who is in communication does not need to receive an unrelated call, and the user who should actually receive the call is not affected by other users. The effect that the incoming call can be received is obtained. Further, various applications can be realized by making it possible to set whether or not to transfer the incoming call during communication.
In this way, by making it possible to select whether to accept or reject incoming call notification from a terminal, such as a telephone, it is possible to select and receive incoming call notification, which is unnecessary during communication of important requirements. It is possible to obtain an effect that it is not necessary to suspend communication due to requirements, or it is not necessary to respond to an incoming call notification during communication such as a prank call.

Further, when communication procedure information indicating an incoming call is received during communication, the calling party number included therein is temporarily held, and when the call during communication is completed, it is automatically sent to the other party who received the call during communication. By providing means for automatically calling, even if there is an incoming call during communication, the communication with the current communication partner is interrupted /
Without disconnecting, without missing a new communication request,
The effect that communication can be formed occurs.

Furthermore, when a call setting message of "no channel" is received, normal communication is performed in terms of transfer capability by displaying the incoming call during communication only to the terminal corresponding to the transfer capability of the call setting message. No terminal does not receive an indication of an incoming call during communication and is not prompted to answer such a call. Furthermore, by making it possible to display each status related to the incoming call during communication from the terminal device, for example, the telephone, the incoming call during communication can be recognized quickly, the other party who is currently talking can be seen at a glance, and the other party who has been waiting can be disconnected. There is an effect that the user can recognize the fact that he / she has done and can smoothly operate the incoming call during communication.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a first embodiment according to the present invention.

FIG. 2 is a step flow chart showing a process of setting whether or not to transfer an incoming call during communication in the first embodiment.

FIG. 3 is a flow chart showing an incoming call processing during communication in the first embodiment.

FIG. 4 is a block diagram of a second embodiment according to the present invention.

FIG. 5 is a flow chart showing processing relating to a call setup message of “no channel” in the second embodiment.

FIG. 6 is a block diagram of a third embodiment according to the present invention.

FIG. 7 is a flow chart showing a characteristic operation of the third embodiment.

FIG. 8 is a block diagram of a telephone device according to a fourth embodiment of the present invention.

FIG. 9 is an operation flow chart when an incoming call notification during communication is received in the fourth embodiment.

FIG. 10 is a block diagram of a telephone device having a switching function according to a fifth embodiment of the present invention.

FIG. 11 is an operational flow chart in the case of receiving an incoming call notification during communication according to the sixth embodiment of the present invention.

FIG. 12 is a block diagram of a seventh embodiment according to the present invention.

FIG. 13 is a diagram showing a logical configuration example of a line used in the seventh embodiment.

FIG. 14 is a front view of a telephone of a seventh embodiment.

FIG. 15 is a flow chart showing control during an incoming call during a call according to a seventh embodiment.

FIG. 16 is a diagram showing a configuration of a system.

FIG. 17 is a diagram showing a flow of control information in a conventional example.

[Explanation of symbols]

11 ISDN, 12 control section, 15 exchange section, 16a, 16b ISDN external line interface, 17a, 17b, 17c, 204, 328, 406
Extension interface, 18a, 18b, 18c, 211 Extension terminal, 101 private branch exchange, 102 ISDN office line interface, 103 telephone interface, 104 data terminal interface, 105 speech path, 106, 325 central control section, 107, 305 , 326 memory, 116 area A for storing transmission capacity, 117 area B for storing terminals in communication, 118 area C for storing attributes of terminals, 119 processing units A, 120 processing units B, 201 communication processing device, 202 ISDN interface, 203 speech path switch, 205 control device, 206 RAM, 207 ROM, 208 timer, 1031, 1032 communication terminal, 1020 communication network, 301 channel demultiplexing circuit, 303 sound source, 304 handset, 306, 324, 402 CPU, 309 key input section, 310 digital line, 321 extension telephone, 322 channel demultiplexing circuit, 327 channel switch 401 main unit, 404 speech network, 405 line interface, 407 line, 408 telephone, 409 LCD, 410 outside line It is a button.

Front Page Continuation (72) Inventor Takuhiro Tanigawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Masatomo Ouchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. In the company

Claims (9)

[Claims] 1. A plurality of extension terminals and a plurality of outside lines are accommodated,
ISDN of at least one line of the plurality of outside lines
A communication method for processing an incoming call during communication of a switching device capable of accommodating a line, wherein a call setting message of call 1 is transmitted from the network to the external ISDN line, and the switching device receives the call during communication. When recognizing that there is, the terminal designation information in the call setting message of the call 1 is checked, and it does not correspond to all the extension terminals communicating through the ISDN line where the call 1 is received, and other accommodated extension terminals. When there is an extension terminal corresponding to the terminal designation information in the call setting message of the call 1, the call 1 accommodated by the switching device is the outside line IS from which the call 1 is received.
A communication method characterized by making an incoming call to an outside line different from the DN line. 2. The communication system according to claim 1, wherein it is possible to set whether or not to transfer the incoming call to an external line different from the external line ISDN line where the call 1 is received. 3. A communication device which accommodates at least one or more ISDN lines and a plurality of transmission lines connected to a terminal, and which can physically connect the B channel of the ISDN line and the transmission lines to each other. Attribute storage means for storing attributes of terminals connected to the road, transfer capacity storage means for recognizing and storing transfer capacity information elements in the received call setting message from the stored ISDN line, and "no channel" from the stored ISDN line. "Detection means for detecting reception of message" and storage information in the transmission capacity storage means and the attribute storage means when the detection means detects reception of "no channel" message through one ISDN line of the stored ISDN lines Indication of an incoming call during communication from a terminal connected to a transmission line connected to one or more B channels of the message receiving ISDN line Selection means for selecting a terminal to perform a communication apparatus characterized by comprising a call display means for displaying in a communication call to the selected terminal in said selection means. 4. A plurality of extension terminals and a plurality of outside lines are accommodated,
ISDN of at least one line of the plurality of outside lines
In a communication device that can receive an incoming call notification during communication that can be connected to a digital line from a switching device that can accommodate the line,
Sending caller number storage means for storing the caller number sent from the caller side, input caller number storage means for storing the caller number input from the operation input unit, and the input caller number It is characterized by further comprising: comparing means for comparing the caller number and the transmitted calling party number; and receiving means for receiving an incoming call notification from the connection line according to the result of the comparison by the comparing means. Communication device. 5. The input calling party number storage means stores the calling number of the other party who should receive the incoming communication notification, and the reception means receives the calling number when receiving the calling number of the other party who should receive the incoming communication notification. 5. The communication device according to claim 4, wherein the communication device is controlled so as to notify the notifier of an incoming call during communication. 6. The communication device according to claim 5, wherein the accepting means causes only a call of a specific caller number registered in advance to receive a call to a designated extension. 7. The input calling party number storage means stores the calling number of the other party who rejects the incoming call notification, and the reception means receives the calling number when the incoming caller number of the other party who rejects the incoming call notification is received. The communication device according to claim 4, wherein the notification is not sent to the notifier. 8. In a communication device such as a key telephone device accommodated in an ISDN network, a first detecting means for detecting an incoming call notification from the ISDN network and a second detecting means for detecting an abandonment of the incoming call. When,
Responding means for responding to incoming calls during extension, and ISD
Switching means for switching the other party to the N network, and ISD
Third detection means for detecting a disconnection signal of the other party before switching from the N network, and a first display when a call is being made to the extension and a second display when an incoming call notification is detected. The first display is made when abandonment of the incoming call is detected, the third display is made when a response to the incoming call is made, and the third display is made when the call partner is switched. If there is a fourth display, if there is a fourth display, then the third display
And a display control means for performing a first display when a disconnection signal of the other party before switching is detected. 9. At least a calling party number is included in the communication procedure information, a control channel and an information channel are independently provided on the line, and even when the information channel is in use, there is an incoming call to the line in use. A communication device capable of notifying by communication procedure information on a control channel, a terminal connecting means for connecting and accommodating a plurality of communication terminals, a control means for controlling a display device of the accommodating communication terminal in the terminal connecting means, and a communication Calling party number holding means for holding a calling party number included in the received communication procedure information when receiving communication procedure information indicating an incoming call, and the calling party number holding means when a call during communication is completed In the communication device, the communication device is provided with an automatic calling means for automatically making a call to the other party who has received the incoming call.