JP2021090173A - Telephone system, telephone controller, and telephone terminal - Google Patents

Abstract

To appropriately record a connection history and makes the connection history available on the basis of the fact of the connection of a telephone line in a telephone system such as a business phone system.SOLUTION: A connection destination change operation determination unit 108 of a SIP server 1 determines whether a request from a subordinate IP telephone terminal changes a connection destination of a call for a notified incoming call. When it is determined that the connection destination of the call is to be changed, a control message generation unit 107 generates control message information that includes source identification information as connection destination identification information, and supplies the information to the IP telephone terminal of a new connection destination. In the IP telephone terminal, an incoming call history including the connection destination identification information of the control message information is recorded in an incoming call history memory.SELECTED DRAWING: Figure 2

Description

The present invention relates to, for example, a telephone system applied to a business phone system constructed in a company or the like and capable of appropriately leaving an incoming call history, a telephone control device and a telephone terminal used in the telephone system.

One of the functions often used as a telephone terminal is a transfer function. In particular, the transfer function is an important function in a business phone system constructed by connecting a plurality of telephone terminals to a telephone control device called a main unit or a SIP (Session Initiation Protocol) server that performs call control. For example, a caller inside or outside the company calls the representative phone number or department phone number, and the primary responder accepts the call and connects the call to the original callee. The transfer function is used in many scenes, such as connecting a phone to the target party.

In the business phone system, the telephone control device and the telephone terminal are dedicated, and it is the telephone control device that controls the call. For this reason, the telephone control device keeps track of the operating state of the telephone terminal connected to the own unit, and the telephone control device often stores the incoming call history as well. In addition, the telephone control device also stores the transfer history, and it is conceivable to leave this as the incoming call history. Further, in the case of an IP (Internet Protocol) telephone terminal, if it can be locally connected to the telephone control device, for example, as disclosed in Patent Document 1 described later, when the transfer is performed a plurality of times. It is also possible to show the route on the screen.

Patent No. 5051368

However, the outgoing call history and the incoming call history are paired information, and the outgoing call history is generated by the occurrence of the outgoing call event, and the incoming call event occurs at the other party. The incoming call history is generated by the event of the incoming call generated at the other party. From this, when the transfer function is used, the call source does not have a record of the call with the transfer destination, and the transfer destination does not have a record of the call with the call source. That is, as shown in FIG. 15, consider a case where a plurality of telephone terminals such as telephone terminals A, B, and C are connected to the SIP server X to form a business phone system. The telephone terminals A, B, and C are installed at remote locations, for example, on different floors, but all of them also function as extension telephones.

In this case, when the extension number of the telephone terminal B is input from the telephone terminal A to make a call (step S301), the telephone terminal A retains a call history indicating that the call has been made to the telephone terminal B (step S302). When the SIP server X notifies the telephone terminal B of an incoming call (step S303), the telephone terminal B retains an incoming call history indicating that an incoming call has been received from the telephone terminal A (step S304). After that, when the user of the telephone terminal B performs a response operation, this is notified to the SIP server X (step S305), and the SIP server X notifies the calling terminal A of the response (step S305). Step S306), the call line is connected and the call becomes possible (step S307).

Due to this call, the user of the telephone terminal B cannot respond by himself / herself, and thinks that it is better to have the user of the telephone terminal C respond to the call, and the user of the telephone terminal A is asked to use the telephone terminal C. The person is informed that the telephone is to be transferred, and the transfer button of the telephone terminal B is pressed (step S308). As a result, the transfer request is notified to the SIP server X (step S309), the SIP server X gives a hold notification to the telephone terminal A (step S310), and puts the call line connected to the telephone terminal A in the hold state. (Step S311).

After that, when the user of the telephone terminal B inputs the extension number of the telephone terminal C to make a call (step S312), the telephone terminal B has a call history indicating that the call has been made to the telephone terminal C (step S313). ). When the SIP server X notifies the telephone terminal C of an incoming call (step S314), the telephone terminal C retains an incoming call history indicating that an incoming call has been received from the telephone terminal B (step S315). After that, when the user of the telephone terminal C performs a response operation, this is notified to the SIP server X (step S316), and the SIP server X notifies the calling terminal B of the response (step S316). In step S317), the call line is connected and the call becomes possible (step S318).

When the user of the telephone terminal C approves to make a call with the user of the telephone terminal A by this call, the user of the telephone terminal B performs a predetermined transfer execution operation such as performing an on-hook operation. As a result, the transfer execution request is transmitted to the SIP server X (step S319). In this case, the SIP server X releases the call line between the telephone terminal B and the telephone terminal C, transmits a transfer instruction (connection instruction) to the source telephone terminal A (step S320), and transfers the transfer destination telephone. A transfer instruction (connection instruction) is transmitted to the terminal C (step S321). As a result, the pending call line with the telephone terminal A is connected to the telephone terminal C (step S322), and a call can be made between the telephone terminal A and the telephone terminal C. ..

In this case, as can be seen from FIG. 15, since the telephone terminal A does not make a call to the telephone terminal C, the telephone terminal A has a history (outgoing history) of making a call to the telephone terminal C. In addition, the history of incoming calls from the telephone terminal A (incoming call history) does not remain in the telephone terminal C. Therefore, even if the user of the telephone terminal A wants to make a call with the user of the telephone terminal C again, since the outgoing call history does not exist, the telephone terminal C cannot be easily called by the history outgoing function. .. Similarly, even if the user of the telephone terminal C wants to make a call with the user of the telephone terminal A again, since the incoming call history does not exist, the telephone terminal A cannot be easily called by the history transmission function. ..

In this case, the user of the telephone terminal A or the user of the telephone terminal C needs to confirm the other party of the call with the user of the telephone terminal B who made the transfer and make a call again, which is troublesome. It will take a lot of trouble. Such inconvenience is caused not only when the transfer function is used, but also when the call line is connected without forming a pair of outgoing and incoming calls by using functions such as a proxy answer function, a hold function, and a park hold function. This is a problem that occurs when the telephone terminal of is changed.

In view of the above, the present invention appropriately records the connection history based on the fact of the connection of the telephone line in the telephone system configured by connecting a plurality of telephone terminals to a telephone control device such as a business phone system. , The purpose is to make this available.

In order to solve the above problems, the telephone system of the invention according to claim 1 is
A telephone system in which a plurality of telephone terminals are connected to a telephone control device that performs call control.
The telephone control device is
When an incoming call occurs to a subordinate telephone terminal, an incoming call control means for notifying the subordinate telephone terminal of the incoming call, and
After notifying the incoming call by the incoming call control means, the determination means for determining whether or not the request from the received telephone terminal changes the connection destination of the call for the incoming call, and the determination means.
When the determination means determines that the request changes the connection destination of the call, control message information including the source identification information as the connection destination identification information is formed for at least the new connection destination. , Equipped with a control message generation means to be provided to the new connection destination
Each of the plurality of telephone terminals
A request forming means that forms a request according to a user's operation input and transmits it to the telephone control device, and a request forming means.
A receiving means for receiving a control message from the telephone control device, and
A control means that controls each unit so as to perform processing according to the control message information received through the receiving means.
When the control message information received through the receiving means is the control message information including the connection destination identification information, the history information forming means for recording the incoming call history including the connection destination identification information in the incoming call history storage means. It is characterized by being prepared.

According to the telephone system of the invention according to claim 1, when an incoming call occurs to a subordinate telephone terminal, the telephone control device notifies the subordinate telephone terminal of the incoming call by the incoming call control means. When a request from a subordinate telephone terminal is received after the incoming call notification, the determination means determines whether or not the requested call changes the connection destination of the call for the notified incoming call. It is assumed that the determination means determines that the request changes the connection destination of the call. In this case, the control message generating means forms control message information including the source identification information as the connection destination identification information for at least the new connection destination, and this is provided to the new connection destination.

In the telephone terminal connected to the telephone control device, the request forming means forms a request according to the operation input of the user and transmits the request to the telephone control device. When the control message information from the telephone control device is received through the receiving means, each unit is controlled by the control means so as to perform processing according to the control message information. Further, when the control message information includes the connection destination identification information by the history information forming means, the incoming call history information including the connection destination identification information is recorded in the incoming call history storage means.

According to the present invention, when a request for changing the other party of a call is provided to the telephone control device after the incoming call notification, the telephone control device forms new control message information including the connection destination identification information. Provided to the destination. At the new connection destination, an incoming call history can be formed based on the connection destination identification information of the control message information. That is, in a telephone system composed of a plurality of telephone terminals connected to a telephone control device such as a business phone system, a call history is appropriately recorded based on the fact of the connection of the telephone line and made available. Can be done.

It is a figure for demonstrating the configuration example of the telephone system of embodiment. It is a block diagram for demonstrating the configuration example of the SIP server which is the telephone control device of embodiment. It is a figure for demonstrating the example of the storage data of the address management DB of a SIP server. It is a figure for demonstrating the example of the message information transmitted from the SIP server. It is a block diagram for demonstrating the configuration example of the IP telephone terminal of embodiment. It is a figure for demonstrating the example of the request transmitted from the IP telephone terminal to the SIP server. It is a sequence diagram for demonstrating the process when a transfer function is used. It is a figure for demonstrating information grasping and control processing in a SIP server when a transfer function can be used. It is a sequence diagram for demonstrating the process when the surrogate response function is used. It is a figure for demonstrating information grasping and control processing in a SIP server when a proxy response function is used. It is a sequence diagram for demonstrating the process when the hold / park hold function is used. It is a figure for demonstrating the information grasping and control processing in the SIP server when the hold / park hold function is used. It is a flowchart for demonstrating the process in a SIP server. It is a flowchart for demonstrating the process in an IP telephone terminal. It is a sequence diagram for demonstrating the process at the time of the conventional transfer.

Hereinafter, an embodiment of the system and apparatus of the present invention will be described with reference to the drawings. In the embodiment described below, a case where the telephone system according to the present invention is applied to, for example, a business phone system (button telephone system) constructed in a company office or the like will be described as an example.

[Telephone system configuration example]
FIG. 1 is a diagram for explaining a configuration example of the telephone system of this embodiment. As shown in FIG. 1, a plurality of IP telephone terminals 3A (1), 3A (2), ..., 3B (1), 3B (2), are attached to the SIP server 1 through a LAN (Local Area Network) 2. ..., 3C (1), 3C (2), ... Are connected to form a business phone system. The SIP server 1 is also connected to the wide area network 4. The wide area network 4 includes a public switched telephone network, a mobile telephone network, an IP telephone network, and the like.

The SIP server 1 is to which the telephone control device according to the present invention is applied, and performs call control of a telephone terminal (subordinate) connected to its own unit. In addition, call control is for making a call, receiving a call, connecting a call line (telephone line) to enable a call, disconnecting the call line, and making a call. It means various controls. The telephone terminal according to the present invention is applied to each of the IP telephone terminals 3A (1), 3A (2), ..., 3B (1), 3B (2), ..., 3C (1), 3C (2), ... It realizes the function of making a call through a call line connected to the other party's telephone terminal.

That is, each of the IP telephone terminals 3A (1), 3A (2), ..., 3B (1), 3B (2), ..., 3C (1), 3C (2), ... , Can make an outside line call with a telephone terminal 5 or a mobile phone terminal (not shown) connected to the wide area network 4. Further, each of the IP telephone terminals 3A (1), 3A (2), ..., 3B (1), 3B (2), ..., 3C (1), 3C (2), ... , Can make an extension call with another IP telephone terminal connected to LAN2. The telephone terminal 5 may be independently connected to the wide area network 4 or may be connected to the wide area network 4 as a telephone terminal of another business phone system.

Further, in the telephone system of this embodiment, the IP telephone terminals 3A (1), 3A (2), ..., The IP telephone terminals 3B (1), 3B (2), ..., And the IP telephone terminal 3C (1). 3, 3C (2), ... Are assumed to be installed in a distant place. For example, the IP telephone terminals 3A (1), 3A (2), ... Are installed in the general affairs department on the 3rd floor, and the IP telephone terminals 3B (1), 3B (2), ... Are installed in the sales department on the 2nd floor. The IP telephone terminals 3C (1), 3C (2), ... Are installed in the manufacturing department on the first floor, and so on.

[Transfer function, proxy response function, hold function, park hold function]
In the telephone system of this embodiment, the transfer function, the proxy answer function, the hold function, and the park hold function are used to make an incoming call a telephone terminal different from the first destination telephone terminal (new connection destination). Can be taken over by.

<Overview of transfer function>
For example, an extension call was made from the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1), but the user of the IP telephone terminal 3B (1) could not answer the requirements, and the IP telephone terminal 3C (1) Suppose you want to take over (turn) the phone to the user. In this case, the user of the IP telephone terminal 3B (1) operates the "transfer button" of the IP telephone terminal 3B (1) used by the user to connect to the IP telephone terminal 3A (1). Put on hold. After that, the extension number of the telephone terminal 3C (1) is dialed, and the extension telephone is made to the telephone terminal 3C (1).

In response to this, if the transfer destination answers the call by off-hooking the telephone terminal 3C (1), a call line is established between the IP telephone terminal 3B (1) and the IP telephone terminal 3C (1). Be connected. In this case, the user of the IP telephone terminal 3B (1) informs the user of the IP telephone terminal 3C (1) that he / she wants to take over the telephone through the connected telephone line. If the user of the IP telephone terminal 3C (1) approves, for example, the user of the IP telephone terminal 3B (1) performs an operation of instructing a predetermined transfer execution such as on-hooking.

As a result, the communication line connected between the IP telephone terminal 3B (1) and the IP telephone terminal 3C (1) is released. Further, the call line between the IP phone terminal 3A (1) in the hold state is connected between the IP phone terminal 3A (1) and the IP phone terminal 3C (1) to enable a call. .. In this way, by using the forwarding function, it is possible to take over the incoming call to the target forwarding destination (new connection destination). In addition, although the case of transferring the extension telephone has been described here as an example, the same can be performed when transferring the outside line telephone.

<Overview of proxy response function>
For example, it is assumed that a call is made from the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1), but the user of the IP telephone terminal 3B (1) is absent. In this case, a user of the nearby IP telephone terminal 3B (2) picks up (off-hooks) the handset of the IP telephone terminal 3B (2) and presses the "proxy answer button" to perform a proxy response. Perform the operation. As a result, it is possible to answer a call from the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1) through the IP telephone terminal 3B (2). In addition, although the case of responding to the incoming extension telephone by proxy has been described here as an example, the same can be performed when answering the incoming external telephone by proxy.

<Overview of hold / park hold function>
For example, an extension call was made from the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1), but the user of the IP telephone terminal 3B (1) could not answer the requirements, and the IP telephone terminal 3C (1) Suppose you want to take over (turn) the phone to the user. In this case, the user of the IP telephone terminal 3B (1) operates the "hold button" of the IP telephone terminal 3B (1) that he / she uses to connect to the IP telephone terminal 3A (1). Put on hold. After that, the extension number of the telephone terminal 3C (1) is dialed, and the extension telephone is made to the telephone terminal 3C (1).

In response to this, if the transfer destination answers the call by off-hooking the telephone terminal 3C (1), a call line is established between the IP telephone terminal 3B (1) and the IP telephone terminal 3C (1). Be connected. In this case, the user of the IP telephone terminal 3B (1) wants the user of the IP telephone terminal 3C (1) to press the "extension button 1" to get out of the extension from the IP telephone terminal 3A (1). Tell that. If the user of the IP telephone terminal 3C (1) approves, the user of the IP telephone terminal 3B (1) on-hooks and disconnects the communication line with the IP telephone terminal 3C (1).

On the other hand, when the user of the IP telephone terminal 3C (1) presses the "extension button 1", the telephone line with the IP telephone terminal 3A (1) in the pending state is changed to the IP telephone terminal 3A. It is connected between (1) and the IP telephone terminal 3C (1) to enable a telephone call. In this way, by using the hold function, at the other party, in the case of this example, an operation such as pressing the "extension button 1" to take over the call is added, but the purpose is to make a call to oneself. It becomes possible to take over to the other party. Here, the case where the extension telephone is held and handed over to another telephone terminal has been described as an example, but the same can be performed when the outside line telephone is held and handed over to another telephone terminal.

As described above, in the case of an extension telephone, the normal hold function associates the connected telephone line with the extension button and puts it in a hold state, and in the case of an outside telephone, associates the connected telephone line with the outside line button. Put it on hold. Therefore, when taking over the held call line, it is performed by pressing the extension button or the outside line button associated with the hold. On the other hand, in the case of the park hold function, the call line connected to the "park hold button" prepared in advance in the IP telephone terminal is associated with the hold state, and the "park hold button" is pressed. This makes it possible to take over the reserved call line.

As described above, the hold function and the park hold function have different "operation buttons" for associating the call lines in the hold state. In the case of the park hold function, there is an advantage that an IP telephone terminal equipped with a "park hold button" can take over the call line put on the park hold. Depending on how the telephone system is configured, for example, the sales department or the manufacturing department may not answer an incoming call to the representative telephone number. In this case, the external line button corresponding to the representative telephone number is not provided in the IP telephone terminal of the sales department or the manufacturing department. Therefore, the hold function cannot take over the incoming call to the representative telephone number to the IP telephone terminal of the sales department or the manufacturing department, but by using the park hold function, the call can be taken over.

In the telephone system of this embodiment, when the transfer function, the proxy answer function, the hold function, and the park hold function are used and the call line is taken over by an IP phone terminal different from the IP phone terminal of the first destination. Even so, the incoming call history can be properly recorded. As a result, even when the call line is taken over, the history transmission function using the incoming call history can be used. Therefore, the user who actually made the call can surely and easily make another contact with the other party who actually made the call by using the IP telephone terminal that he / she used.

In the following, first, the SIP server 1 used in the telephone system of this embodiment and the IP telephone terminals 3A (1), 3A (2), ..., 3B (1), 3B (2), ..., 3C ( 1), 3C (2), ..., A configuration example will be described. After that, the overall operation of the telephone system, the processing performed by the SIP server 1, the IP telephone terminals 3A (1), 3A (2), ..., 3B (1), 3B (2), ..., 3C (1) The processing performed in each of 3, 3C (2), ... Will be described.

In this embodiment, the IP telephone terminals 3A (1), 3A (2), ..., 3B (1), 3B (2), ..., 3C (1), 3C (2), ... It basically has the same configuration and realizes the same function. Therefore, in the description of the configuration example, the IP telephone terminals 3A (1), 3A (2), ..., 3B (1), 3B (2), ..., 3C (1), 3C (2), ... Are collectively referred to. Then, it is described as IP telephone terminal 3.

[Configuration example of SIP server 1]
FIG. 2 is a block diagram for explaining a configuration example of the SIP server 1 which is the telephone control device of the embodiment. The connection end 101T constitutes a connection end to the wide area network 4. The communication I / F (Interface) 101 is a part that performs communication processing through the wide area network 4. That is, the communication I / F 101 converts the signal addressed to the own machine transmitted via the wide area network 4 into a signal in a format that can be processed by the own machine, and captures the signal. Further, the communication I / F 101 converts a signal transmitted from its own device to a target destination, converts it into a signal in a transmission format, sends it to the wide area network 4, and transmits it to the destination.

Although not shown, the control unit 102 is a microprocessor including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a non-volatile memory, and the like, and controls each unit of the SIP server 1. In addition, the control unit 102 can also perform decomposition processing / generation processing of various data such as control data and voice data that are transmitted and received in packets. The storage device 103 is a device unit including a recording medium and its driver, such as an HDD (Hard Disk Drive) and an SSD (Solid State Drive), and records, changes, deletes, reads, and the like of various data. .. The storage device 103 stores necessary data and programs, and is also used as a work area for temporarily storing intermediate data generated in various processes.

The address management DB 104 is created in a recording device unit such as an HDD or SSD, and stores and holds address information and other management information about the IP telephone terminal 3 housed in the own machine. FIG. 3 is a diagram for explaining an example of stored data of the address management DB 104 of the SIP server 1. As shown in FIG. 3, the address management DB 104 contains "extension number", "IP (Internet Protocol) address", "port number", and "other" for each IP telephone terminal 3 accommodated in the SIP server 1. Each information is stored and retained.

The "extension number" is a number for an extension telephone assigned to all the IP telephone terminals 3 accommodated in the SIP server 1. The IP address is information that is assigned to a device that can connect to the Internet by, for example, a DHCP (Dynamic Host Configuration Protocol) server, and can uniquely identify each device that can connect to the Internet. In this embodiment, an IP address is assigned to each of the IP telephone terminals 3 housed in the SIP server 1.

The port number is a port number used by each of the IP telephone terminals 3. As "others", it is possible to add various necessary information such as a MAC address (Media Access Control address) and a URL (Uniform Resource Locator) of the IP telephone terminal 3, for example. From the stored data of the address management DB 104, the SIP server 1 can grasp each of the IP telephone terminals 3 accommodated in the own machine.

The connection end 105T constitutes a connection end to LAN2. The LANI / F (Interface) 105 enables communication between the SIP server 1 and the IP telephone terminal 3 accommodated in the SIP server 1 through the LAN 2. Therefore, the signal from the SIP server 1 to the IP telephone terminal 3 is converted into a signal in a transmission format by the LANI / F 105 and transmitted to the IP telephone terminal 3. Further, the signal from the IP telephone terminal 3 is converted into a signal in a format that can be processed by the own machine in the LANI / F105 and taken in.

Under the control of the control unit 102, the call control unit 106 uses the management information of the address management DB 104 to perform call control such as outgoing call, incoming call, answering, and disconnection of the IP telephone terminal 3 under its control. As shown in FIG. 2, the call control unit 106 includes a transmission control unit 1061 and an incoming call control unit 1062. When the call control unit 106 receives a call (call request) from the subordinate telephone terminal 3, the call control unit 1061 functions to call the instructed other party, and when the other party answers, the call line is disconnected. Connect and enable calls.

When the call control unit 106 receives an incoming call addressed to its own device (outgoing notification from the other party), the incoming call control unit 1062 functions to notify the subordinate IP telephone terminal 3 of the incoming call. As a result, the IP telephone terminal 3 emits a ringing tone and notifies the occurrence of an incoming call. When an operation for answering an incoming call (off-hook operation) is performed on the IP telephone terminal 3, the incoming call control unit 1062 detects this, answers the incoming call, and communicates with the subordinate IP telephone terminal 3 that has been off-hooked. Connect a call line to the phone to enable calls.

In the SIP server 1 of this embodiment, the process of suspending, transferring, or releasing the connected telephone line is controlled by the control unit 102 in response to a request from the subordinate telephone terminal 3. Processed below. Further, even when the proxy response function is used after the incoming call notification, it is processed under the control of the control unit 102 in response to the request from the subordinate telephone terminal 3. In addition, the control unit 102 also performs lighting / extinguishing control of the LED (Light Emitting Diode) included in the subordinate telephone terminal 3 and display control on the display.

In the SIP server 1 shown in FIG. 2, the control message generation unit 107 and the connection destination change operation determination unit 108 can appropriately form and hold an incoming call history in the telephone system of this embodiment. It becomes the main part. The control message generation unit 107 forms control message information for the telephone terminal to be controlled, and performs a process of providing the control message information. The telephone terminal to be controlled includes an outside line telephone terminal that has made a call, but is mainly an IP telephone terminal 3 under the control of the own unit.

FIG. 4 is a diagram for explaining an example of control message information transmitted from the SIP server 1. As shown in FIG. 4, the control message information generated by the control message generation unit 107 and provided from the SIP server 1 to the IP telephone terminal 3 under the control message includes "instruction / notification message" and "notification destination information". , "Connection destination information". The "instruction / notification message" is information indicating the content of the control message information, such as whether the control message information is a response notification, a hold notification, a transfer instruction, or a connection instruction. The "notification destination information" is information for specifying the notification destination (providing destination) of the control message information, and is information including an extension number, an IP address, a port number, and the like.

The "connection destination information" is information newly notified by the present invention. For example, suppose that the transfer function, proxy response function, hold function, and park hold function described above are used, and an IP telephone terminal 3 different from the first call destination becomes a new connection destination. In this case, when a transfer instruction or connection instruction is issued to connect the call line, the extension number or outside line number of the caller is set to "connection destination information" for the IP telephone terminal 3 which is the new connection destination. The control message information is formed and provided. On the other hand, the extension number of the new connection destination is provided to the source by forming control message information as "connection destination information".

As a result, in the IP telephone terminal 3 which is the new connection destination, by leaving the extension number and the outside line number of the caller as the incoming call history, the history transmission function from the transfer destination to the caller, which was not possible in the past, You will be able to retransmit using. Therefore, re-access from the forwarding destination to the source can be performed reliably and easily. Further, the IP telephone terminal 3 of the calling source holds the extension number of the notified new connection destination as, for example, an incoming call history. As a result, the IP telephone terminal 3 of the call source can make a re-transmission using the history transmission function to a new connection destination such as a transfer destination, which was not possible in the past. Therefore, re-access from the source to the transfer destination can be performed reliably and easily.

If the caller is an outside line telephone terminal, the connection destination instruction may be notified, but it is generally the outside line telephone terminal that cannot use this. Therefore, as in the conventional case, it is possible to send a response notification for connecting the telephone line to the outside line telephone terminal of the call source so as not to notify the extension number of the new connection destination.

The connection destination change operation determination unit 108 uses functions such as a transfer function, a proxy response function, a hold function, and a park hold function for a request from the subordinate IP phone terminal 3, and the IP phone terminal is different from the first destination. Performs a process of determining whether or not 3 is the new connection destination. In the connection destination change operation determination unit 108, the request from the subordinate IP telephone terminal 3 uses functions such as a transfer function, a proxy response function, a hold function, and a park hold function, and the IP phone terminal is different from the first destination. It is assumed that it is determined that 3 is the new connection destination.

In this case, under the control of the control unit 102, the control message generation unit 107 generates control message information including the connection destination information as described with reference to FIG. 4, and the telephone terminal to which the telephone line is connected is generated. Will be sent to. As described above, the SIP server 1 of this embodiment generates the control message information to which the connection destination information which is the new information described with reference to FIG. 4 is added, and provides the control message information to the telephone terminal to which the telephone line is connected. And connect the call line. In addition, the incoming call history can be appropriately recorded according to the control message information.

[Configuration example of telephone terminal 3]
FIG. 5 is a block diagram for explaining a configuration example of the IP telephone terminal 3 of the embodiment. The connection end 301T constitutes a connection end to LAN2. The LANI / F301 realizes the connection with the SIP server 1 through the LAN 2. That is, the LANI / F301 performs a process of converting a signal transmitted to the own machine into a signal in a format that can be processed by the own machine and taking the signal into the own machine. Further, the LANI / F301 performs a process of converting a signal transmitted from its own unit into a signal for transmission and transmitting the signal. The telephone terminal 3 of this embodiment is wiredly connected to the SIP server 1 through the connection end 301T and the LANI / F301.

Although not shown, the control unit 302 is a microprocessor formed by connecting a CPU, a ROM, a RAM, a non-volatile memory, and the like through a CPU bus. The control unit 302 controls each unit of the IP telephone terminal 3. The control unit 302 also performs decomposition processing / generation processing of various data such as control data and voice data that are transmitted and received in packets. The storage device 303 is, for example, a device unit including a semiconductor memory and a driver thereof, and records, changes, deletes, reads, and the like various data. The storage device 303 stores and holds necessary data and programs, and is also used as a work area for temporarily storing intermediate data generated in various processes.

The operation unit 304 receives an operation input from the user and provides the received information to the control unit 302. The operation unit 304 is provided with various operation buttons such as a numeric keypad, a transfer button, a proxy response button, a hold button, a park hold button, an outside line button, and an extension button, and a plurality of flexible keys to which functions can be assigned. The transmission history memory 305 is a device unit including a semiconductor memory and its driver, and when a transmission operation is performed from its own unit, a transmission history consisting of the date and time of the transmission operation and the extension number or outside line number of the other party who made the call. Is stored in memory. The incoming call history memory 306 is a device unit including a semiconductor memory and a driver thereof, and stores and holds an incoming call history consisting of an incoming call date and time and an extension number or an outside line number of the sender when an incoming call occurs in the own device.

The display 307 includes a display controller, and under the control of the control unit 302, performs a process of displaying various information on the display screen of the display 307. The displayed information includes various information such as the telephone number of the other party entered, the telephone number of the caller, the guidance message, and the warning message. The sound emitting unit 308 and the speaker 309, under the control of the control unit 302, emit a ringtone when receiving an incoming call. In addition, the sound emitting unit 308 can also, for example, emit a warning sound in the case of an erroneous operation from the speaker 309, or emit various voice messages and the like from the speaker 309.

The handset 311 is provided with a speaker (receiver) and a microphone (transmitter). In the IP telephone terminal 3, when the handset 311 is placed in the fixed position of the housing of the IP telephone terminal 3, it is in the on-hook state, and when it is picked up from the fixed position of the housing of the IP telephone terminal 3, it is in the off-hook state. ing. The IP telephone terminal 3 has a configuration in which the control unit 302 can grasp the on-hook / off-hook state.

The codec 310 receives the packet-decomposed voice data supplied by the control unit 302, compresses and decompresses the voice data, converts it into an analog voice signal, and supplies it to the speaker of the handset 311 in the off-hook state. As a result, the sound from the other party is emitted from the speaker of the handset 311. Further, the codec 310 converts the analog audio signal picked up by the microphone of the handset 311 in the off-hook state into a digital signal, compresses the data, and supplies the analog audio signal to the control unit 302. The control unit 302 packetizes the voice data from the codec 310 and transmits this to the other party through the LANI / F301 and the connection end 301T.

Under the control of the control unit 302, the request forming unit 312 forms a request (request information) to be transmitted to the SIP server 1 in response to an instruction input from the user received through the operation unit 304. The request forming unit 312 sends the formed request to the LAN 2 through the LANI / F301 and the connection end 301T, and provides the request to the SIP server 1.

FIG. 6 is a diagram for explaining an example of a request transmitted from the IP telephone terminal 3 to the SIP server 1. That is, FIG. 6 is a diagram for explaining a specific example of a request formed in the request forming unit 312 of the IP telephone terminal 3 and transmitted to the SIP server 1. The request formed by the request forming unit 312 of the IP telephone terminal 3 is simply composed of "request content", "request source information", and "necessary information" as shown in FIG. 6 (A).

In FIG. 6A, the “request content” is information indicating the content requested from the IP telephone terminal 3 to the SIP server 1. The "request source information" is identification information such as an extension number and an IP address that can identify the source of the request in the SIP server 1, and is an extension number in this embodiment. The "necessary information" is information that needs to be notified to the SIP server 1 according to the content of the request.

In the case of a outgoing call request, as shown in FIG. 6B, the "request content" is "outgoing" and the "request source information" is the "extension number" (for example, "101") of the IP telephone terminal that generated the request. ) ”, And the necessary information is the“ other party number (for example, “201”) ”of the other party to call. In reality, the "request content" is code information indicating the request content. Further, in the case of the example shown in FIG. 6B, the "destination number" indicates the case of the extension number, and of course, it may be the case of the outside line number.

Further, in the case of an incoming call answer request when an incoming call notification is given and the incoming call is answered, the "request content" becomes the "incoming call answer" and the "request source information" becomes as shown in FIG. 6 (C). The "extension number" of the IP telephone terminal that generated the request is, for example, "101". In the case of a transfer request, as shown in FIG. 6D, the "request content" is "transfer", and the "request source information" is the "extension number" of the IP telephone terminal that generated the request. For example, it becomes "101".

Similarly, in the case of a hold request, as shown in FIG. 6 (E), the "request content" is "hold" and the "request source information" is the "extension number" of the IP telephone terminal that generated the request. For example, it becomes "101". Further, in the case of a proxy response request, as shown in FIG. 6 (F), the "request content" is the "proxy response", and the "request source information" is the "extension number" of the IP telephone terminal that generated the request. For example, "101". In this way, the IP telephone terminal 3 connected to the SIP server 1 can form various requests by the request forming unit 312 in response to the instruction input from the user, and can transmit the various requests to the SIP server 1 through the LAN 2.

When making a call from its own unit, the history information forming unit 313 forms a sending history consisting of the date and time information at the time of making a call and the extension number or the outside line number of the other party to make a call under the control of the control unit 302. This is recorded in the outgoing call history memory 305. The date and time information is obtained from a clock circuit that provides the current date, the current day of the week, and the current time. Further, when the incoming call notification addressed to the own machine arrives from the SIP server 1, the history information forming unit 313 uses the date and time information at the time of the incoming call and the extension number or the outside line number of the sender under the control of the control unit 302. The incoming call history is formed and recorded in the incoming call history memory 306. The date and time information at the time of an incoming call can be obtained from the clock circuit 314, and the extension number or the outside line number of the sender can be those included in the incoming call notification.

Further, when the history information forming unit 313 receives the control message information such as the transfer instruction and the connection instruction including the connection destination information from the SIP server 1, the incoming call history including the date and time information at the time of reception and the connection destination information. Is also formed, and the process of recording this in the incoming call history memory 306 is also performed. Conventionally, it has been possible to retain an outgoing call history formed when a call is made and an incoming call history formed when an incoming call is received (when an incoming call occurs). However, when the transfer function, proxy answer function, hold function, park hold function, etc. are used and the call line is taken over from the first destination to another IP telephone terminal 3, the fact that the call line is taken over does not remain. ..

Therefore, when a forwarding instruction or a connection instruction including connection destination information is received from the SIP server 1, the call history is formed and left in the IP telephone terminal 3 that inherits the call line from the first call destination. I am trying to be able to leave. Further, in the case of an extension telephone, the IP telephone terminal 3 of the caller can also keep a history of the call line being taken over by another IP telephone terminal 3 from the first destination.

[Processing when the call line is taken over from the first callee]
Next, in a telephone system composed of the SIP server 1 and the IP telephone terminal 3 having the above-described configuration, a process when an event occurs in which a telephone line is taken over from the first called destination will be specifically described. In the following, as an example of the case where the call line is taken over from the first destination, the transfer function is used, the proxy answer function is used, and the hold function (park hold function) is used. Three cases will be described.

<Processing when using the transfer function>
FIG. 7 is a sequence diagram for explaining a process when the transfer function is used. Further, FIG. 8 is a diagram for explaining information grasping and control processing in the SIP server 1 when the transfer function is used. Here, for example, an extension call is made from the IP telephone terminal 3A (1) of the general affairs department on the third floor of the office to the IP telephone terminal 3B (1) of the sales department on the second floor of the office, and this is the manufacturing department on the first floor of the office. The case of being transferred to the IP telephone terminal 3C (1) of the above will be described as an example.

First, when the extension number of the IP telephone terminal 3B (1) is input from the IP telephone terminal 3A (1) to make a call (step S1), the IP telephone terminal 3A (1) makes a call to the IP telephone terminal 3B (1). The transmission history (described as “history” in the figure) indicating that the above has been performed is stored (step S2). The SIP server 1 that has received the outgoing call request from the IP telephone terminal 3A (1) notifies the IP telephone terminal 3B (1) of the incoming call (step S3). The IP telephone terminal 3B (1) performs processing such as emitting a ringtone, and records an incoming call history (indicated as "arrival history" in the figure) indicating that an incoming call has been received from the telephone terminal 3A (1). Store (step S4).

After that, when the user of the IP telephone terminal 3B (1) performs a response operation such as an off-hook operation, this is notified to the SIP server 1 (step S5). The SIP server 1 notifies the source IP phone terminal 3A (1) that there is a response from the IP phone terminal 3B (1) (step S6), and receives a call with the source IP phone terminal 3A (1). A telephone line is connected to the IP telephone terminal 3B (1) above, and a telephone call becomes possible (step S7).

It is assumed that the user of the IP telephone terminal 3B (1) cannot handle the call by himself / herself and should have the user of the IP telephone terminal 3C (1) handle the call. In this case, inform the user of the IP telephone terminal 3A (1) that the telephone will be transferred to the user of the IP telephone terminal 3C (1), and obtain approval. After that, the user of the IP telephone terminal 3B (1) presses the transfer button of the IP telephone terminal 3B (1) (step S8). As a result, the transfer request is notified from the IP telephone terminal 3B (1) to the SIP server 1 (step S9). The SIP server 1 notifies the IP telephone terminal 3A (1) of the hold (step S10), and puts the call line connected to the IP telephone terminal 3A (1) in the hold state (step S11). In this case, the hold sound is provided to the IP telephone terminal 3A (1), and the user of the IP telephone terminal 3A (1) can recognize that it is in the hold state.

After that, when the user of the IP telephone terminal 3B (1) inputs the extension number of the IP telephone terminal 3C (1) and makes a call (step S12), the IP telephone terminal 3B (1) is connected to the IP telephone terminal 3C. The transmission history indicating that the transmission was made in (1) is stored (step S13). The SIP server 1 notifies the IP telephone terminal 3C (1) of an incoming call (step S14). In the IP telephone terminal 3C (1), a ring tone is emitted to notify the user that there is an incoming call, and an incoming call history indicating that an incoming call has been received from the IP telephone terminal 3B (1) is stored. (Step S15). When the user of the IP telephone terminal 3C (1) performs a response operation such as an off-hook operation, this is notified to the SIP server 1 (step S16). The SIP server 1 notifies the source IP telephone terminal 3B (1) of the response (step S17), and newly connects the IP telephone terminal 3B (1) and the IP telephone terminal 3C (1). A call line is connected and a call is made possible (step S18).

It is assumed that the user of the IP telephone terminal 3C (1) agrees to make a call with the user of the IP telephone terminal 3A (1) by the call in step S18. In this case, the user of the IP telephone terminal 3B (1) performs a predetermined transfer execution operation such as an on-hook operation, so that the transfer execution request is transmitted to the SIP server 1 (step S19). In this case, the SIP server 1 releases the telephone line between the telephone terminal B and the telephone terminal C.

The SIP server 1 generates a transfer instruction (control message information) to which connection destination information is added, which is transmitted to each of the IP telephone terminal 3A (1) and the IP telephone terminal 3C (1) to which the telephone line is connected (step). S20). The control message information for the IP telephone terminal 3A (1) generated in step S20 is that the "instruction / notification message" is the "forwarding instruction" and the "notification destination information" is the "IP telephone terminal 3A (1)". The "connection destination information" is the "IP telephone terminal 3C (1)". On the other hand, as for the message information for the IP telephone terminal 3C (1) generated in step S20, the "instruction / notification message" is the "forwarding instruction" and the "notification destination information" is the "IP telephone terminal 3C (1)". , "Connection destination information" is "IP telephone terminal 3A (1)".

The SIP server 1 transmits the message information for the IP telephone terminal 3A (1) generated in step S20 to the IP telephone terminal 3A (1) (step S21). As a result, in the IP telephone terminal 3A (1), a history (incoming call history) indicating that an incoming call has been received from the IP telephone terminal 3C (1) is formed and stored based on the control message information from the SIP server 1. Yes (step S22). In this case, in the IP telephone terminal 3A (1) which is the original source, the IP telephone terminal 3C (1) forms and holds the incoming call history from the IP telephone terminal 3C (1). This is because it is not the other party who made the call from 3A (1), but the other party who was transferred.

Further, the SIP server 1 transmits the message information for the IP telephone terminal 3C (1) generated in step S20 to the IP telephone terminal 3C (1) (step S23). As a result, in the IP telephone terminal 3C (1), a history (incoming call history) indicating that an incoming call has been received from the IP telephone terminal 3A (1) can be formed and stored based on the message information from the SIP server 1. (Step S24). In this case, the transfer is from the IP telephone terminal 3B (1), but formally, it is regarded as an incoming call from the IP telephone terminal 3A (1), so that an incoming call history is formed and stored. After that, a telephone line is connected between the IP telephone terminal 3A (1) and the IP telephone terminal 3C (1) (step S25), and a telephone call is enabled.

In this way, as described with reference to FIG. 4, the SIP server 1 forms a transfer instruction message including the connection destination information, and the source IP telephone terminal 3A (1) and the transfer destination IP telephone terminal 3C. Send to (1). As a result, a telephone line is connected between the source IP telephone terminal 3A (1) and the transfer destination IP telephone terminal 3C (1). That is, the IP telephone terminal 3A (1) can transfer the telephone call to the IP telephone terminal 3B (1) to the IP telephone terminal 3C (1) and take over to the IP telephone terminal 3C (1). Moreover, since the transfer instruction message including the connection destination information is transmitted to the source IP telephone terminal 3A (1) and the transfer destination IP telephone terminal 3C (1), an incoming call history is formed based on the connection destination information. , This can be stored in memory.

In this case, the processing status described with reference to FIG. 7 is managed by the SIP server 1 as shown in FIG. As shown in FIG. 8, first, a call is made from the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1) (No. 1 in FIG. 8). An answer operation is performed to answer an incoming call to the IP telephone terminal 3B (1), a call line is connected, and a transfer function is used in the IP telephone terminal 3B (1) (No. 2 in FIG. 8), and the IP telephone terminal 3A The telephone line connected to (1) is on hold (No. 3 in FIG. 8).

After that, an extension call is made from the IP telephone terminal 3B (1) to the IP telephone terminal 3C (1) (No. 4 in FIG. 8), and the IP telephone terminal 3B (1) and the IP telephone terminal 3C (1) are displayed. A telephone line is connected between the two to enable a telephone call (No. 5 in FIG. 8). By this call, the transfer is actually agreed, and the execution instruction operation of the transfer function is performed on the IP telephone terminal 3B (1) (No. 6 in FIG. 8).

From the processing status shown in FIG. 8, it is known that in the SIP server 1, the call line connected to the IP telephone terminal 3A (1) is put on hold by the transfer function. On the other hand, the IP telephone terminal 3B (1), which executes the transfer function, performs the transfer execution operation after making an extension call to the IP telephone terminal 3 (C). In the SIP server 1, the transfer destination is the IP. It is known that it is the telephone terminal 3C (1). Therefore, as described in step S20 of FIG. 7, the SIP server 1 refers to the IP telephone terminal 3A (1) in which the call line is on hold and the IP telephone terminal 3C (1) which is the transfer destination. To generate control message information that serves as a transfer instruction.

The generated control message information is transmitted to the IP telephone terminal 3A (1) and the IP telephone terminal 3C (1) to establish a communication line between the IP telephone terminal 3A (1) and the IP telephone terminal 3C (1). It is possible to connect and make a call (No. 7 in FIG. 8). Moreover, it is possible to leave an incoming call history that matches the actual connection status of the call line in each of the source IP telephone terminal 3A (1) and the transfer destination IP telephone terminal 3C (1).

<Processing when using the proxy response function>
FIG. 9 is a sequence diagram for explaining a process when the proxy response function is used. Further, FIG. 10 is a diagram for explaining information grasping and control processing in the SIP server when the proxy response function is used. Here, for example, an extension call is made from the IP telephone terminal 3A (1) of the general affairs department on the third floor of the office to the IP telephone terminal 3B (1) of the sales department on the second floor of the office, and this is called the IP telephone terminal 3B (1). ) Will be used as an example to provide a proxy response using the IP telephone terminal 3B (2).

First, when the extension number of the IP telephone terminal 3B (1) is input from the IP telephone terminal 3A (1) to make a call (step S31), the IP telephone terminal 3A (1) makes a call to the IP telephone terminal 3B (1). The transmission history indicating that the call has been made is stored (step S32). The SIP server 1 that has received the outgoing call request from the IP telephone terminal 3A (1) notifies the IP telephone terminal 3B (1) of the incoming call (step S33). The IP telephone terminal 3B (1) performs processing such as emitting a ringtone, and records an incoming call history (indicated as "arrival history" in the figure) indicating that an incoming call has been received from the telephone terminal 3A (1). Store (step S34). The processing up to this point is the same as the processing in steps S1 to S4 shown in FIG.

In this case, since the user of the IP telephone terminal 3B (1) is absent, the user of the IP telephone terminal 3B (2) presses the proxy answer button of the IP telephone terminal 3B (2) (step S35). ), It is assumed that an incoming call to the IP telephone terminal 3B (1) is answered instead. In this case, the proxy response request is transmitted from the IP telephone terminal 3B (2) to the SIP server 1 (step S36).

The SIP server 1 transmits to each of the source IP telephone terminal 3A (1) and the proxy response destination IP telephone terminal 3B (2) in order to connect the call line in response to the received proxy response request. Generate control message information to which connection destination information is added (step S37). The message information for the IP telephone terminal 3A (1) generated in step S37 is that the "instruction / notification message" is "response notification" and the "notification destination information" is "IP telephone terminal 3A (1)". The "connection destination information" is the "IP telephone terminal 3B (2)". On the other hand, as for the message information for the IP telephone terminal 3B (2) generated in step S37, the "instruction / notification message" is "response notification" and the "notification destination information" is "IP telephone terminal 3B (2)". , "Connection destination information" is "IP telephone terminal 3A (1)".

The SIP server 1 transmits the message information for the IP telephone terminal 3A (1) generated in step S37 to the IP telephone terminal 3A (1) (step S38). As a result, in the IP telephone terminal 3A (1), a history (incoming call history) indicating that an incoming call has been received from the IP telephone terminal 3B (2) can be formed and stored based on the message information from the SIP server 1. (Step S39). In this case, in the IP telephone terminal 3A (1) which is the original source, the IP telephone terminal 3B (2) forms and holds the incoming call history from the IP telephone terminal 3B (2). This is because it is not the person to whom the call was made from 3A (1). That is, the IP telephone terminal 3B (2) is the other party of the call by the proxy response, and is for distinguishing from the other party who made the call.

Further, the SIP server 1 transmits the message information for the IP telephone terminal 3B (2) generated in step S33 to the IP telephone terminal 3B (2) (step S40). As a result, in the IP telephone terminal 3B (2), a history (incoming call history) indicating that an incoming call has been received from the IP telephone terminal 3A (1) can be formed and stored based on the message information from the SIP server 1. (Step S41). In this case, it is a proxy response of an incoming call to the IP telephone terminal 3B (1), but formally, it can be regarded as an incoming call from the IP telephone terminal 3A (1), so that an incoming call history is formed and stored. .. After that, a telephone line is connected between the IP telephone terminal 3A (1) and the IP telephone terminal 3B (2) (step S42), and a telephone call is enabled.

In this way, as described with reference to FIG. 4, the SIP server 1 forms the control message information of the response notification including the connection destination information, and the IP telephone terminal 3A (1) of the source and the proxy response destination. It is transmitted to the IP telephone terminal 3B (2). As a result, a telephone line is connected between the source IP telephone terminal 3A (1) and the proxy response destination IP telephone terminal 3B (2). That is, the IP telephone terminal 3B (2) can make a proxy response to the telephone call made by the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1). Further, since the control message information of the response notification including the connection destination information is transmitted to the source IP telephone terminal 3A (1) and the proxy response destination IP telephone terminal 3B (2), the incoming call is received based on the connection destination information. A history can be formed and stored in memory.

In this case, the processing status described with reference to FIG. 9 is managed by the SIP server 1 as shown in FIG. As shown in FIG. 10, first, a call is made from the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1) (No. 1 in FIG. 10). With respect to the incoming call to the IP telephone terminal 3B (1), a proxy answer operation is performed through the IP telephone terminal 3B (2) (No. 2 in FIG. 10).

From the processing status shown in FIG. 10, in the SIP server 1, an incoming call from the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1) and generated in the IP telephone terminal 3B (1) is an IP. It is known that the telephone terminal 3B (2) responded by proxy. Therefore, as described in step S37 of FIG. 9, control message information serving as a response notification is formed for the source IP telephone terminal 3A (1) and the proxy response destination IP telephone terminal 3B (2). And send. As a result, a telephone line can be connected between the IP telephone terminal 3A (1) and the IP telephone terminal 3B (2), and a telephone call can be made (No. 3 in FIG. 10). Moreover, it is possible to leave an incoming call history that matches the actual connection status of the call line in each of the source IP telephone terminal 3A (1) and the proxy response destination IP telephone terminal 3B (2).

<Processing when using the hold / park hold function>
Next, the processing when the hold / park hold function is used will be described. Note that the process is almost the same when the hold function is used and when the park hold function is used, except that the operation buttons to be operated are different. Therefore, here, the case where the hold function is used will be described as an example. To do. FIG. 11 is a sequence diagram for explaining a process when the hold function is used. Further, FIG. 12 is a diagram for explaining information grasping and control processing in the SIP server when the hold function is used.

Here, for example, an extension call is made from the IP telephone terminal 3A (1) of the general affairs department on the third floor to the IP telephone terminal 3B (1) of the sales department on the second floor, and this is the IP telephone terminal 3C (1) of the manufacturing department on the first floor. The case of taking over by using the hold function in 1) will be described as an example. Therefore, the situation is the same as when the transfer function described with reference to FIGS. 7 and 8 is used, and the processes from step S1 to step S18 in FIG. 11 are the steps S1 to S18 shown in FIG. The process is almost the same as the process.

That is, when a call is made from the IP phone terminal 3A (1) to the IP phone terminal 3B (1) (step S1), the call history is stored in the IP phone terminal 3A (1) (step S2). The SIP server 1 that has received the outgoing call request from the IP telephone terminal 3A (1) notifies the IP telephone terminal 3B (1) of the incoming call (step S3). The IP telephone terminal 3B (1) performs processing such as emitting a ringtone and stores the incoming call history (step S4).

After that, when the user of the IP telephone terminal 3B (1) performs a response operation, this is notified to the SIP server 1 (step S5). The SIP server 1 notifies the source IP phone terminal 3A (1) that there is a response from the IP phone terminal 3B (1) (step S6), and receives a call with the source IP phone terminal 3A (1). A telephone line is connected to the IP telephone terminal 3B (1) above, and a telephone call becomes possible (step S7).

Due to this call, the user of the IP telephone terminal 3B (1) cannot handle it by himself / herself, and thinks that it is better to have the user of the IP telephone terminal 3C (1) handle it, and the IP telephone terminal 3A (1) ) To the user of the IP telephone terminal 3C (1) to take over (turn) the telephone. After that, the user of the IP telephone terminal 3B (1) presses the hold button of the IP telephone terminal 3B (1) (step S8A). As a result, the hold request is notified from the IP telephone terminal 3B (1) to the SIP server 1 (step S9A). The SIP server 1 notifies the IP telephone terminal 3A (1) of the hold (step S10), and puts the call line connected to the IP telephone terminal 3A (1) in the hold state (step S11). In this case, the hold sound is provided to the IP telephone terminal 3A (1), and the user of the IP telephone terminal 3A (1) can recognize that it is in the hold state.

After that, when the user of the IP telephone terminal 3B (1) inputs the extension number of the IP telephone terminal 3C (1) and makes a call (step S12), the call history is stored in the IP telephone terminal 3B (1). (Step S13). The SIP server 1 notifies the IP telephone terminal 3C (1) of an incoming call (step S14). In the IP telephone terminal 3C (1), the ring tone is emitted to notify the user that there is an incoming call, and the incoming call history is stored (step S15). When the user of the IP telephone terminal 3C (1) performs a response operation such as an off-hook operation, this is notified to the SIP server 1 (step S16). The SIP server 1 notifies the source IP telephone terminal 3B (1) of the response (step S17), and newly connects the IP telephone terminal 3B (1) and the IP telephone terminal 3C (1). A call line is connected and a call is made possible (step S18).

In the call in step S18, for example, the IP phone terminal 3B (1) is receiving (holding) the call from the IP phone terminal 3A (1) and wants to answer the call from the IP phone terminal 3A (1). ) Notifies the user of the IP telephone terminal 3C (1). It is assumed that the user of the IP telephone terminal 3C (1) agrees to make a call with the user of the IP telephone terminal 3A (1) by the call in step S18. In this example, when the user of the IP telephone terminal 3B (1) performs the on-hook operation, the SIP server 1 is notified that the on-hook operation has been performed from the IP telephone terminal 3B (1) (step S51). In response to this, the SIP server 1 transmits a disconnection notification to the IP telephone terminal 3C (1) (step S52), and connects the IP telephone terminal 3B (1) and the IP telephone terminal 3C (1) connected in step S18. Release the call line between.

After that, the user of the IP telephone terminal 3C (1) makes a call connected to the IP telephone terminal 3A (1) notified by the user of the IP telephone terminal 3B (1) by the call in step S18. The line is suspended, for example, the "extension button 1" is pressed. As a result, the notification that the connection operation has been performed is transmitted to the SIP server 1 (step S53). The SIP server 1 generates control message information (connection instruction) to which connection destination information is added, which is transmitted to each of the IP telephone terminal 3A (1) and the IP telephone terminal 3C (1) to which the telephone line is connected (step). S54).

The control message information for the IP telephone terminal 3A (1) generated in step S54 is that the "instruction / notification message" is the "connection instruction" and the "notification destination information" is the "IP telephone terminal 3A (1)". The "connection destination information" is the "IP telephone terminal 3C (1)". On the other hand, as for the control message information for the IP telephone terminal 3C (1) generated in step S54, the "instruction / notification message" is the "connection instruction" and the "notification destination information" is the "IP telephone terminal 3C (1)". Then, the "connection destination information" is the "IP telephone terminal 3A (1)".

The SIP server 1 transmits the control message information for the IP telephone terminal 3A (1) generated in step S54 to the IP telephone terminal 3A (1) (step S55). As a result, in the IP telephone terminal 3A (1), a history (incoming call history) indicating that an incoming call has been received from the IP telephone terminal 3C (1) is formed and stored based on the control message information from the SIP server 1. Yes (step S56). In this case, in the IP telephone terminal 3A (1) which is the original source, the IP telephone terminal 3C (1) forms and holds the incoming call history from the IP telephone terminal 3C (1). This is because it is not the other party who made the call from 3A (1), but the other party who was transferred.

Further, the SIP server 1 transmits the control message information for the IP telephone terminal 3C (1) generated in step S54 to the IP telephone terminal 3C (1) (step S57). As a result, in the IP telephone terminal 3C (1), a history (incoming call history) indicating that an incoming call has been received from the IP telephone terminal 3A (1) can be formed and stored based on the message information from the SIP server 1. (Step S58). In this case, the call line is taken over from the IP telephone terminal 3B (1), but formally, it can be regarded as an incoming call from the IP telephone terminal 3A (1), so that an incoming call history is formed and stored. .. After that, a telephone line is connected between the IP telephone terminal 3A (1) and the IP telephone terminal 3C (1) (step S59), and a telephone call is enabled.

In this way, as described with reference to FIG. 4, the SIP server 1 forms the control message information which is the connection instruction including the connection destination information, and the IP telephone terminal 3A (1) of the source and the transfer destination It is transmitted to the IP telephone terminal 3C (1). As a result, a telephone line is connected between the source IP telephone terminal 3A (1) and the transfer destination IP telephone terminal 3C (1). That is, the IP telephone terminal 3A (1) can request the IP telephone terminal 3B (1) to take over the call by using the hold function, and the IP telephone terminal 3C (1) can take over the call. Moreover, since control message information, which is a connection instruction including connection destination information, is transmitted to the source IP phone terminal 3A (1) and the transfer destination IP phone terminal 3C (1), an incoming call is received based on the connection destination information. A history can be formed and stored in memory.

In this case, the processing status described with reference to FIG. 11 is managed by the SIP server 1 as shown in FIG. As shown in FIG. 12, first, a call is made from the IP telephone terminal 3A (1) to the IP telephone terminal 3B (1) (No. 1 in FIG. 12). An answer operation is performed to answer an incoming call to the IP telephone terminal 3B (1), a call line is connected, and a hold function is used in the IP telephone terminal 3B (1) (No. 2 in FIG. 12), and the IP telephone terminal 3A The telephone line connected to (1) is on hold (No. 3 in FIG. 12).

After that, an extension call is made from the IP telephone terminal 3B (1) to the IP telephone terminal 3C (1) (No. 4 in FIG. 12), and the IP telephone terminal 3B (1) and the IP telephone terminal 3C (1) are displayed. A telephone line is connected between the two to enable a telephone call (No. 5 in FIG. 12). By this call, an agreement is actually made to take over the call line, and the call line is disconnected from the IP telephone terminal 3B (1) (No. 6 in FIG. 12). After that, in the IP telephone terminal 3C (1), the extension button is pressed and this is notified to the SIP server 1 (No. 7 in FIG. 12).

From the processing status shown in FIG. 12, it is known that in the SIP server 1, the call line connected to the IP telephone terminal 3A (1) is put on hold by the hold function. .. On the other hand, in the IP phone terminal 3B (1) that executes the hold function, the IP phone terminal 3C (1) performs a connection operation after making an extension call to the IP phone terminal 3 (C), and the SIP server. In 1, it is known that the takeover destination is the IP telephone terminal 3C (1). Therefore, as described in step S54 of FIG. 11, the connection instruction is given to the IP telephone terminal 3A (1) in which the call line is on hold and the IP telephone terminal 3C (1) to be taken over. Form control message information.

The formed control message information is transmitted to the IP telephone terminal 3A (1) and the IP telephone terminal 3C (1), a telephone line is connected between the IP telephone terminals, and a telephone call is possible (No. in FIG. 12). .7). Moreover, it is possible to leave an incoming call history that matches the actual connection status of the call line in each of the source IP phone terminal 3A (1) and the takeover destination IP phone terminal 3C (1).

When the park hold function is used, the hold button pressing operation performed in step S8A of FIG. 11 becomes the park hold button pressing operation, and the hold request is transmitted to the SIP server 1 performed in step S9A. Is the transmission of the park hold request. The connection operation performed in step S53 is not the operation of pressing the extension button. In this case, the park hold button corresponding to the park hold button operated by the IP phone terminal 3B (1) in step S8A is operated by the IP phone terminal 3C (1), and this is notified to the SIP server 1 as a connection operation. Will be done. As described above, when the park hold function is used, the processing is performed in almost the same manner as when the hold function is used, only the operation buttons to be operated are different.

[Summary of processing of SIP server 1]
FIG. 13 is a flowchart for explaining the process executed by the SIP server 1 of the telephone system described above. The process shown in FIG. 13 is a process that is always executed by the control unit 102 when the SIP server 1 is in a power-on state. The control unit 102 receives the request addressed to the own machine through the connection end 101T and the communication I / F 101 and the connection end 105T and the LANI / F 105 (step S101), and determines whether or not the request addressed to the own machine has been received. Determine (step S102). When it is determined in the determination process of step S102 that the request addressed to the own machine has not been received, the control unit 102 repeats the process from step S101 and waits for the arrival of the request addressed to the own machine.

It is assumed that it is determined that the request addressed to the own machine has been received in the determination process in step S102. In this case, the control unit 102 controls the connection destination change operation determination unit 108, confirms the content of the received request (step S103), and determines whether the received request is a request including a change of the connection destination. (Step S104). Specifically, the determination process in step S104 determines whether it is the following four requests. That is, the received request is a transfer execution request after the transfer request, a proxy response request, a connection request from a telephone terminal different from the telephone terminal that performed the hold operation after the hold request, or a park hold operation after the park hold request. Determine if the connection request is from a telephone terminal different from the one that made the call.

In the determination process of step S104, it is assumed that the received request is determined to be a request including a change of the connection destination. In this case, the control unit 102 controls the control message generation unit 107 to generate control message information including connection destination information for each of the other parties of the call (step S105). In step S105, the control unit 102 transmits the control message information generated by the control message generation unit 107 to each of the other parties to the call (step S106). In the case of the above example, each of the callees is the first callee who connects or takes over the call line connected between the caller's telephone terminal and the caller. Means each with another IP telephone terminal.

Further, in the determination process of step S104, it is assumed that the received request is determined not to include the change of the connection destination. In this case, the control unit 102 controls the control message generation unit 107 to generate normal control message information that does not include the connection destination information (step S107). Specifically, a normal call request that includes the phone number of the other party to call but does not include the connection destination information, a normal incoming call notification that includes the caller's phone number but does not include the connection destination information, etc. are generated. To. In step S107, the control unit 102 transmits the control message information generated by the control message generation unit 107 to the target destination (step S108). After the processing of step S106 and step S108, the control unit 102 repeats the processing from step S101.

In this way, the SIP server 1 of the telephone system of this embodiment can perform the process accompanied by the takeover of the telephone line described with reference to FIGS. 7 to 12, and is immediately based on the fact that the telephone line is connected. Then, it is possible to keep the incoming call history.

[Summary of processing of telephone terminal 3]
FIG. 14 is a flowchart for explaining the process executed by the IP telephone terminal 3 of the telephone system described above. The process shown in FIG. 14 is a process that is always executed by the control unit 302 when the power is turned on to the IP telephone terminal 3. The control unit 302 receives an instruction input from the user through the operation unit 304 (step S201), and determines whether or not the instruction input has been received (step S202).

When it is determined in the determination process of step S202 that the instruction input from the user has been received, the control unit 302 controls the request forming unit 312 to form a request according to the instruction input (step S203), and this is SIP. It is transmitted to the server 1 (step S204). The control unit 302 determines whether or not the transmitted request is a transmission request (step S205), and when it determines that the transmission request is a transmission request, the control unit 302 controls the history information forming unit 313 to form a transmission history, which is used as the transmission history. A process of adding to the memory 305 is performed (step S206).

After the process of step S206, when it is determined in the determination process of step S202 that the instruction input from the user is not accepted, and when it is determined in the determination process of step S205 that the transmitted request is not a transmission request. , The process from step S207 is performed. That is, the control message information from the SIP server 1 is received (step S207), and it is determined whether or not the control message information has been received (step S208). If it is determined that the control message information from the SIP server 1 has been received in the determination process of step S208, the process according to the received control message information is executed (step S209).

After that, the control unit 302 determines whether or not the received message information from the SIP server 1 includes the destination information or the connection destination information (step S210). It is assumed that in the determination process of step S210, it is determined that the received message information from the SIP server 1 includes the transmission destination information or the connection destination information. In this case, the control unit 302 controls the history information forming unit 313 to form an incoming call history and adds the incoming call history memory 306 to the incoming call history memory 306 (step S211).

After the process of step S211, the process from step S201 is repeated. Further, even when it is determined in the determination process of step S208 that the message information from the SIP server 1 has not been received, the process from step S201 is repeated. Similarly, in the determination process of step S210, even if it is determined that the received message information from the SIP server 1 does not include the destination information or the connection destination information, the process from step S201 is repeated.

As a result, as in the case of the conventional telephone terminal, the outgoing call history can be formed and stored when making a call from the own device, and the incoming call history can be formed and stored when receiving an incoming call to the own device. Further, when the call line is taken over by the IP telephone terminal 3 different from the first callee after the incoming call, the incoming call history can be formed and stored at both the source and the takeover destination.

[Effect of Embodiment]
In the telephone system of the above-described embodiment, it is possible to appropriately leave a call history and make it available based on the fact of the connection of the telephone line. That is, when the call line is taken over by the IP telephone terminal 3 different from the first call destination, the incoming call history with the call source as the connection destination can be accumulated in the new connection destination, and the call source has a new call history. Incoming call history for the other party can be accumulated.

Therefore, when the transfer function, proxy answer function, hold function, park hold function, etc. are used to take over the call line, the history is left as an incoming call history according to the fact of the call line connection. be able to. By accumulating this incoming call history, the history transmission function can be used, and not only when making a call or receiving an incoming call, but also when a transfer is performed, the other party who made the call On the other hand, it becomes easy to make a call again.

[Modification example]
In the above-described embodiment, the case where the transfer of the telephone line by transfer or the like is performed only once has been described, but the present invention is not limited to this. The call line may be taken over multiple times. In this case, the incoming call history can be formed and accumulated for the new connection destination and the caller according to the actual connection status of the call line. However, it is not necessary to accumulate a new incoming call history when the pending call line is not taken over, for example, when the transfer is refused by the other party who made the extension call for the first time. ..

Further, in the above-described embodiment, it has been described that the incoming call history is newly accumulated in the IP telephone terminal of the new connection destination and the IP telephone terminal of the sender, but the present invention is not limited to this. In the IP telephone terminal of the calling source, history information with the new connection destination as the other party may be left as the outgoing call history.

In addition, when the control message information including the connection destination information is transmitted between the new connection destination IP phone terminal and the source IP phone terminal, a new history information such as transfer is formed and retained. You may do it. The transfer history in this case consists of at least the date and time when the transfer was performed and new connection destination information.

Further, in the above-described embodiment, the outgoing call history and the incoming call history have been described as being stored and retained in each IP telephone terminal 3, but the present invention is not limited to this. For example, the SIP server 1 may be configured to store the outgoing call history and the incoming call history for each IP telephone terminal 3. In this case, the SIP server 1 can accumulate the outgoing call history and the incoming call history formed in each IP telephone terminal 3. Further, the SIP server 1 may be configured to form an incoming call history or the like at the timing when the control message information of the transfer instruction and the control message information of the connection instruction are generated, and store the incoming call history for each IP telephone terminal 3. ..

Further, in the above-described embodiment, the case where an extension telephone is made and the transfer function, the proxy answer function, the hold function, and the park hold function are used to take over the call line has been described as an example. It is not limited to the case of applying. The same process can be used when taking over the call line connected by the incoming outside line telephone.

Further, in the above-described embodiment, the telephone control device according to the present invention is applied to the SIP server 1, and the telephone terminal according to the present invention is applied to the IP telephone terminal 3, but the present invention is not limited to this. As described between the SIP server 1 and the IP telephone terminal 3 of the above-described embodiment, if information can be transmitted and received, the system is composed of a main device such as a PBX (Private Branch eXchange) and a button telephone terminal. The present invention can also be applied to telephone systems.

[Other]
As can be seen from the description of the above-described embodiment, the function of the incoming call control means of the telephone control device according to the claim is the incoming call of the SIP server 1 of the embodiment (hereinafter, simply referred to as SIP server 1). The control unit 1062 is realized. Further, the function of the claim determination means is realized by the connection destination change operation determination unit 108 of the SIP server 1. Further, the function of the control message generation means of the telephone control device according to the claim is realized by the control message generation unit 107 of the SIP server 1.

Further, the function of the request forming means of the telephone terminal of the claim is realized by the request forming unit 312 of the IP telephone terminal 3 of the embodiment (hereinafter, simply referred to as the IP telephone terminal 3). Further, the function of the receiving means of the claim is realized by the connection end 301T and the LANI / F301. Further, the function of the control means is realized by the control unit 302 of the IP telephone terminal 3. Further, the function of the history information forming means of the telephone terminal of the claim is realized by the history information forming unit 313 of the IP telephone terminal 3.

Further, the telephone control device of the present invention can be realized by forming a program that executes the process shown in the flowchart of FIG. 13 and mounting the program on the telephone control device so that the program can be executed. Further, the telephone terminal of the present invention can be realized by forming a program that executes the process shown in the flowchart of FIG. 14 and mounting the program on the telephone terminal so that the program can be executed.

1 ... SIP server, 101T ... connection end, 101 ... communication I / F, 102 ... control unit, 103 ... storage device, 104 ... address management DB, 105T ... connection end, 105 ... LANI / F, 106 ... call control unit, 1061 ... Outgoing control unit, 1062 ... Incoming call control unit, 107 ... Control message generation unit, 108 ... Connection destination change operation determination unit, 2 ... LAN, 3 ... IP phone terminal, 3A (1), 3A (2) ... IP phone Terminal, 3B (1), 3B (2) ... IP phone terminal, 3C (1), 3C (2) ... IP phone terminal, 301T ... connection end, 301 ... LANI / F, 302 ... control unit, 303 ... storage device , 304 ... Operation unit, 305 ... Outgoing history memory, 306 ... Incoming call history memory, 307 ... Display, 308 ... Sound emitting unit, 309 ... Speaker, 310 ... Codec, 311 ... Handset, 312 ... Request forming unit, 313 ... History information Formation unit, 314 ... Clock circuit, 4 ... Wide area network, 5 ... External line telephone terminal

Claims (5)

A telephone system in which a plurality of telephone terminals are connected to a telephone control device that performs call control.
The telephone control device is
When an incoming call occurs to a subordinate telephone terminal, an incoming call control means for notifying the subordinate telephone terminal of the incoming call, and
After notifying the incoming call by the incoming call control means, the determination means for determining whether or not the request from the received telephone terminal changes the connection destination of the call for the incoming call, and the determination means.
When the determination means determines that the request changes the connection destination of the call, control message information including the source identification information as the connection destination identification information is formed for at least the new connection destination. , Equipped with a control message generation means to be provided to the new connection destination
Each of the plurality of telephone terminals
A request forming means that forms a request according to a user's operation input and transmits it to the telephone control device, and a request forming means.
A receiving means for receiving a control message from the telephone control device, and
A control means that controls each unit so as to perform processing according to the control message information received through the receiving means.
When the control message information received through the receiving means is the control message information including the connection destination identification information, the history information forming means for recording the incoming call history including the connection destination identification information in the incoming call history storage means. A telephone system characterized by being equipped. The telephone system according to claim 1.
When the caller's telephone terminal is a subordinate telephone terminal, the control message generation means of the telephone control device causes the caller's telephone terminal to have the new connection destination in addition to the new connection destination. A telephone system characterized in that control message information including the identification information of a connection destination is formed and provided to the telephone terminal of the caller. The telephone system according to claim 1 or 2.
The discriminating means of the telephone control device includes a transfer execution request after the transfer request, a proxy response request, a connection request from a telephone terminal different from the immediately preceding destination after the hold request, and the immediately preceding destination after the park hold. A telephone system characterized by being one of a park connection request from a different telephone terminal. The telephone control device of a telephone system configured by connecting a plurality of telephone terminals to a telephone control device that performs call control.
When an incoming call occurs to a subordinate telephone terminal, an incoming call control means for notifying the subordinate telephone terminal of the incoming call, and
After notifying the incoming call by the incoming call control means, the determination means for determining whether or not the request from the received telephone terminal changes the connection destination of the call for the incoming call, and the determination means.
When the determination means determines that the request changes the connection destination of the call, control message information including the source identification information as the connection destination identification information is formed for at least the new connection destination. , A telephone control device including a control message generating means provided to the new connection destination. The telephone terminal of a telephone system configured by connecting a plurality of telephone terminals to a telephone control device that performs call control.
A request forming means that forms a request according to a user's operation input and transmits it to the telephone control device, and a request forming means.
A receiving means for receiving a control message from the telephone control device, and
A control means that controls each unit so as to perform processing according to the control message information received through the receiving means.
When the control message information received through the receiving means is the control message information including the connection destination identification information, the history information forming means for recording the incoming call history including the connection destination identification information in the incoming call history storage means. A telephone terminal characterized by being provided.

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