Communication terminal and control method

Abstract

To provide a communication terminal capable of appropriately switching between a plurality of communication methods.SOLUTION: A communication terminal (1) includes a call control unit (71) that controls calls made by an IP wireless processing unit (72) that performs IP wireless communication and calls made by an IP telephone processing unit (73) that performs IP telephone calls. The call control unit controls a call via IP wireless communication to be made using a handset (20) if a call via IP wireless communication is being conducted using a main body side speaker and a main body side microphone when the handset is off-hooked, and controls an IP telephone call to be made using the handset if IP wireless communication is not being conducted when the handset is off-hooked.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a communication terminal and a control method for the communication terminal.

Background Art

[0002] Conventionally, relay devices that relay voice communication such as transceivers or telephones over a network have been proposed. By connecting a plurality of relay devices via a network, it is also possible to enable different types of communication devices, such as IP phones and radios, to communicate with each other by voice.

[0003] Patent Document 1 discloses a relay device that enables switching of the transmission control method of a voice signal according to the function of a communication partner. When there is a call from a SIP phone to an analog transceiver, the relay device determines the address and device type of the analog transceiver from the call information, and transmits the voice signal to the analog transceiver using a transmission control method suitable for the analog transceiver.

[0004] In addition, communication terminals equipped with both an IP phone call function using SIP and a PTT call function using an IP network by the PTT method have also been put into practical use. In the following description, for convenience, communication by the PTT method is referred to as IP wireless communication, and a call by IP wireless communication is referred to as an IP wireless call.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a communication terminal equipped with both an IP phone call function and an IP wireless call function, calls are made using one microphone and one speaker. In this case, switching between the IP phone call function and the IP wireless call function is performed by an instruction input from the user. On the other hand, for example, in a stationary communication terminal equipped with a main body speaker and a main body microphone, and a handset speaker and a handset microphone, there is room for improvement in how to switch between the IP phone call function and the IP wireless call function.

[0007] One aspect of the present invention aims to realize a communication terminal and the like that can easily switch between an IP phone call function and an IP wireless call function in a communication terminal equipped with both functions.

Means for Solving the Problem

[0008] To solve the above problems, a communication terminal according to one aspect of the present invention includes a PTT call processing unit that performs PTT calls by the PTT (Push to Talk) method, an IP phone processing unit that performs IP phone calls by SIP (Session Initiation Protocol) via an IP (Internet Protocol) network, a call control unit that controls PTT calls by the PTT call processing unit and IP phone calls by the IP phone processing unit, a main body equipped with a main body speaker and a main body microphone, and a handset equipped with a handset speaker and a handset microphone. When the handset is off-hooked, the call control unit controls the PTT call to be made by the handset when the PTT call is being made by the main body speaker and the main body microphone, and controls the IP phone call to be made by the handset when the PTT call is not being made at the time when the handset is off-hooked.

[0009] Also, a control method for a communication terminal according to an aspect of the present invention includes a PTT call processing unit that performs a PTT call by the PTT method, an IP phone processing unit that performs an IP phone call by SIP via an IP network, a main body including a main body side speaker and a main body side microphone, and a handset including a handset side speaker and a handset side microphone. The control method for the communication terminal includes, when the handset is off-hooked, if a call by the PTT call is being made by the main body side speaker and the main body side microphone, controlling the PTT call processing unit so that the call by the PTT call is made by the handset; and when the handset is off-hooked and the PTT call is not being made, controlling the IP phone processing unit so that the IP phone call is made by the handset.

[0010] The communication terminal according to each aspect of the present invention may be implemented by a computer. In this case, a control program for a communication terminal that realizes the communication terminal by operating a computer as each part (software element) included in the communication terminal, and a computer-readable recording medium on which the program is recorded also fall within the scope of the present invention.

Advantages of the Invention

[0011] According to one aspect of the present invention, it is possible to realize a communication terminal or the like that can easily switch between an IP phone call function and an IP wireless call function.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0013] Hereinafter, an embodiment of the present invention will be described in detail.

[0014] 〔Communication System〕 FIG. 1 is a diagram showing an example of the configuration of a communication system 100 including a communication terminal 1 according to Embodiment 1. In the example shown in FIG. 1, the communication system 100 includes a relay device 110, a communication terminal 1, and communication terminals 131, 132, 133, 134.

[0015] The communication terminal 1 is a communication terminal capable of making calls using a plurality of communication methods. Specifically, the communication terminal 1 has a PTT (Push to Talk) call function using an IP (Internet Protocol) network by the PTT method and an IP phone call function by IP phone communication using SIP (Session Initiation Protocol). As will be described later, the connection of the communication terminal 1 to the IP network 121 may be made by wire or wirelessly. In the following description, for convenience, communication by the PTT method is referred to as IP wireless communication, and a call by the IP wireless communication is referred to as an IP wireless call function. The communication terminal 1 is connected to the IP network 121 by wire or wirelessly and is connected to the relay device 110 via the IP network 121. The specific configuration of the communication terminal 1 will be described later. Note that communication by the PTT method is not limited to that via an IP network and may be performed via other types of communication networks.

[0016] The communication terminals 131 to 134 are communication terminals capable of communicating via IP wireless communication or IP telephone communication. The communication terminal 131 is connected to the relay device 110 via the IP network 121 and performs IP wireless communication. The communication terminal 132 is connected to the relay device 110 via an LTE (Long-Term Evolution) communication network 122 having a base station (not shown) and performs IP wireless communication. The communication terminal 133 is connected to the relay device 110 via the IP network 121 and performs IP wireless communication and IP telephone communication. The communication terminal 134 is connected to the relay device 110 via the LTE communication network 122 and performs IP wireless communication and IP telephone communication.

[0017] The relay device 110 is a device in which a VoIP (Voice over Internet Protocol) gateway 111 and a network communication relay unit 112 are integrally configured. However, the communication system 100 does not necessarily need to include the relay device 110 in which the VoIP gateway 111 and the network communication relay unit 112 are integrated, and the VoIP gateway 111 and the network communication relay unit 112 may be provided separately.

[0018] The VoIP gateway 111 is a gateway device that relays the VoIP procedure for transmitting voice signals via the IP network 121 and a communication terminal that performs telephone communication. The VoIP gateway 111 relays IP telephone communication between the communication terminal 1 and the communication terminals 133 and 134, or between the communication terminals 133 and 134. The communication terminal 134 is connected to the VoIP gateway 111 in the relay device 110 via the LTE communication network 122.

[0019] The VoIP gateway 111 incorporates a SIP (Session Initiation Protocol) server function. The SIP server function is a function that uses the SIP protocol to associate a telephone number (URI) with an IP address and perform call control to call and connect the telephone of the communication partner. However, the communication system 100 may be provided with an IP-PBX (Internet Protocol Private Branch eXchange) device that performs circuit switching of communication terminals having an IP telephone communication function instead of the VoIP gateway 111.

[0020] The network communication relay unit 112 relays communication between the communication terminal 1 and the communication terminals 131 to 134, or between the communication terminals 131 to 134. In particular, the network communication relay unit 112 relays IP wireless communication between the communication terminal 1 and the communication terminals 131 to 134, or between the communication terminals 131 to 134.

[0021] In addition, the network communication relay unit 112 receives voice packets transmitted from the communication terminal 1 or the communication terminals 131, 133. Further, the network communication relay unit 112 distributes the voice signal of this packet to the communication terminal 1 or the communication terminals 131, 133 of the communication partner based on the communication control information written in the voice packet. Thereby, the user can perform voice communication via the IP network 121 with the same feeling of use as a conventional transceiver.

[0022] Note that in the relay device 110, the VoIP gateway 111 and the network communication relay unit 112 may be connected so that a call can be made between a communication terminal performing IP telephone communication and a communication terminal performing IP wireless communication.

[0023] 〔Configuration of Communication Terminal〕 FIG. 2 is a plan view showing an example of the appearance of the communication terminal 1. FIG. 3 is a block diagram showing an example of the configuration of the main part of the communication terminal 1. In the examples shown in FIGS. 2 and 3, the communication terminal 1 includes a main body 10, a handset 20, and a cord 30. In FIG. 3, the cord 30 is omitted.

[0024] The main body 10 includes a main body side speaker 11 and a main body side microphone 12. The main body side speaker 11 outputs sound during a call made by the main body 10. The main body side microphone 12 receives an input of sound during a call made by the main body 10.

[0025] The main body 10 further includes a hook switch 13. The hook switch 13 is pressed when the handset 20 is on-hook and released when the handset 20 is off-hook. That is, the hook switch 13 is a switch for detecting whether or not the handset 20 is off-hook.

[0026] The main body 10 further includes a PTT button 14. The PTT button 14 is a button for starting a transmission by the PTT method. For example, the communication terminal 1 may start a transmission at the timing when the user presses the PTT button 14 and end the transmission at the timing when the user releases the PTT button 14. Alternatively, the communication terminal 1 may start a transmission at the timing when the user presses and releases the PTT button 14 and end the transmission at the timing when the user presses and releases the PTT button 14 again.

[0027] The main body 10 further includes a display unit 15. The display unit 15 displays information about the operation of the communication terminal 1. The display unit 15 may be a known display device such as a liquid crystal panel.

[0028] For example, when IP wireless communication is being performed, the display unit 15 displays information indicating that IP wireless communication is being performed. Further, when IP phone communication is being performed, the display unit 15 may display information indicating that IP phone communication is being performed. Thereby, the user can easily recognize in which mode the call is being made by checking the display unit 15.

[0029] In addition, when there is an incoming call for IP phone communication while IP wireless communication is being performed, or when there is a reception for IP wireless communication while IP phone communication is being performed, the display unit 15 displays to that effect.

[0030] The main body 10 further includes an instruction input unit 16. The instruction input unit 16 may be a button provided on the surface of the main body 10, but is not limited thereto. For example, the instruction input unit 16 may be a touch panel provided so as to overlap the display unit 15. The instruction input unit 16 receives an instruction input from the user to display at least one of a call destination list, a reception or incoming call history, and a transmission or outgoing call history on the display unit 15.

[0031] When the above instruction input is received at the time when IP wireless communication is being performed, the display unit 15 may display at least one of an address book, a reception history, and a transmission history related to IP wireless communication. Further, when the above instruction input is received at the time when IP phone communication is being performed, the display unit 15 may display at least one of a phone book, an incoming call history, and an outgoing call history related to IP phone communication.

[0032] Generally, the address book or phone book, the reception or incoming call history, and the transmission or outgoing call history in communication are different from each other between IP wireless communication and IP phone communication. By having the display unit 15 display at least one of the address book or phone book, the reception or incoming call history, and the transmission or outgoing call history as described above, it becomes possible to display on the display unit information corresponding to the communication method in which communication is being performed at that time.

[0033] The handset 20 includes a handset-side speaker 21 and a handset-side microphone 22 (see FIG. 3). The handset-side speaker 21 outputs sound during a call made by the handset 20. The handset-side microphone 22 receives an input of sound during a call made by the handset 20. When communicating using the handset 20, the user may hold the handset 20 near his or her head such that the handset-side speaker 21 is positioned near the ear and the handset-side microphone 22 is positioned near the mouth.

[0034] The cord 30 is a cord that connects the main body 10 and the handset 20. As for the cord 30, a known cord can be used without particular limitation.

[0035] Also, as shown in FIG. 3, a headset 90 can be connected to the communication terminal 1. The user can connect the headset 90 to the communication terminal 1 and make a call. The headset 90 includes a headset-side speaker 91 and a headset-side microphone 92. The headset-side speaker 91 outputs sound during a call made by the headset 90. The headset-side microphone 92 receives an input of sound during a call made by the headset 90.

[0036] 〔Detailed Configuration of Main Body〕 A more detailed configuration of the main body 10 will be described below.

[0037] The main body 10 is provided with amplifiers 41, 42, 43, 44, 45, and 46. The amplifier 41 amplifies the audio signal output to the main body side speaker 11. The amplifier 42 amplifies the audio signal input from the main body side microphone 12. The amplifier 43 amplifies the audio signal output to the handset side speaker 21. The amplifier 44 amplifies the audio signal input from the handset side microphone 22. The amplifier 45 amplifies the audio signal output to the headset side speaker 91 when the headset 90 is connected to the communication terminal 1. The amplifier 46 amplifies the audio signal input from the headset side microphone 92 when the headset 90 is connected to the communication terminal 1. Note that the handset side speaker 21 and the headset side speaker 91 may be configured to be amplified by one amplifier, and the connection destination may be switched appropriately by a switch. Similarly, the handset side microphone 22 and the headset side microphone 92 may be configured to be amplified by one amplifier, and the connection destination may be switched appropriately by a switch.

[0038] The main body 10 further includes a main body side codec 51 and a handset side codec 52. The communication terminal 1 transmits and receives the audio signal in an encoded state. The main body side codec 51 decodes the audio signal received from the outside and outputs it to the main body side speaker 11. Also, the main body side codec 51 encodes the audio signal input from the main body side microphone 12.

[0039] The handset side codec 52 decodes the audio signal received from the outside and outputs it to the handset side speaker 21. Also, the handset side codec 52 encodes the audio signal input from the handset side microphone 22.

[0040] Furthermore, when the headset 90 is connected to the communication terminal 1 and the user communicates using the headset 90, the handset side codec 52 decodes the audio signal received from the outside and outputs it to the headset side speaker 91. Also, in this case, the handset side codec 52 encodes the audio signal input from the headset side microphone 92.

[0041] The main body 10 further includes an audio cancellation processing unit 60. The audio cancellation processing unit 60 removes the audio signals output to the main body side speaker 11 and the handset side speaker 21 from the audio signals input from the main body side microphone 12 or the handset side microphone 22. When a headset 90 is connected to the communication terminal 1, the audio cancellation processing unit 60 removes the audio signals output to the main body side speaker 11, the handset side speaker 21, and the headset side speaker 91 from the audio signals input from the main body side microphone 12, the handset side microphone 22, or the headset side microphone 92.

[0042] That is, the audio cancellation processing unit 60 prevents howling caused by the output of the main body side speaker 11 being input to the main body side microphone 12 and howling caused by the output of the handset side speaker 21 being input to the handset side microphone 22. Further, even when an IP phone call is made using the handset 20, the audio cancellation processing unit 60 cancels the output from the main body side speaker 11 in addition to the output from the handset side speaker 21 from the audio signal of the handset side microphone 22, thereby suppressing the output from being mixed into the call being made on the handset 20 side. As a result, the quality of the audio signal transmitted to the outside can be improved regardless of whether the audio signal is input from the main body side microphone 12, the handset side microphone 22, or the headset side microphone 92.

[0043] The main body 10 further includes a control unit 70. The control unit 70 controls the operation of the communication terminal 1. The control unit 70 includes a call control unit 71, an IP wireless processing unit (PTT call processing unit) 72, and an IP phone processing unit 73.

[0044] The IP wireless processing unit 72 performs IP wireless communication in the PTT method via the IP network 121. The IP phone processing unit 73 performs IP phone communication by SIP via the IP network 121. The call control unit 71 controls the calls made by the IP wireless processing unit 72 and the calls made by the IP phone processing unit 73.

[0045] Specifically, when the handset 20 goes off-hook, if IP wireless communication is being performed by the main body speaker 11 and the main body microphone 12, the call control unit 71 controls the call by the IP wireless processing unit 72 so that IP wireless communication is performed by the handset 20. Here, the "case where IP wireless communication is being performed" means that a call is in progress by IP wireless communication or within a predetermined time after receiving voice by IP wireless communication. The predetermined time may be a length of time generally assumed as a blank time during a call, for example, 5 seconds. Also, when the handset 20 goes off-hook and IP wireless communication is not being performed, the call control unit 71 controls the call by the IP phone processing unit 73 so that an IP phone call by SIP is performed by the handset 20.

[0046] By the above control, in the communication terminal 1, whether an IP wireless communication is being performed or not when the handset 20 goes off-hook determines whether a call by IP wireless communication or a call by IP phone communication is switched to be performed by the handset 20. Therefore, the user can make a call in an appropriate call mode only by the operation of taking the handset 20 off-hook. In this case, the IP wireless communication continues until the handset 20 is next put on-hook.

[0047] Also, when the handset 20 goes off-hook and neither IP wireless communication nor IP phone communication is being performed, the call control unit 71 causes the handset side speaker 21 to output a dial tone (DT) sound in the IP phone communication. Further, when the PTT button 14 is pressed in this state, the call control unit 71 starts IP wireless communication.

[0048] With the above control, when the handset 20 is off-hooked in the communication terminal 1 while neither IP wireless communication nor IP telephone communication is being performed, it first stands by in a state where IP telephone communication can be started. Then, when the PTT button 14 is pressed, IP wireless communication is started. Also in this case, the IP wireless communication continues until the handset 20 is on-hooked next.

[0049] Therefore, when the user wants to make an IP telephone call, the user can simply off-hook the handset 20 and input the telephone number of the called party, etc. On the other hand, when the user wants to perform IP wireless communication, the user can off-hook the handset 20 and press the PTT button. That is, the user can start a call in a desired mode with natural operations.

[0050] Also, as described above, when there is an incoming call for IP telephone communication while IP wireless communication is being performed, or when there is a reception for IP wireless communication while IP telephone communication is being performed, the display unit 15 displays that fact. At this time, the call control unit 71 may switch from IP wireless communication to IP telephone communication, or switch from IP telephone communication to IP wireless communication, in response to an instruction input from the user. Thereby, when there is an incoming call for IP telephone communication while IP wireless communication is being performed, or when there is a reception for IP wireless communication while IP telephone communication is being performed, the user can change to a desired mode based on the display on the display unit.

[0051] The control unit 70 is not limited to the processing by the call control unit 71, the IP wireless processing unit 72, and the IP telephone processing unit 73, and comprehensively controls the operation of the communication terminal 1. The control unit 70 controls, for example, the display unit 15 to display the above-described information.

[0052] The main body 10 further includes a storage unit 80. The storage unit 80 is a storage device that stores information required by the control unit 70 in the control of the communication terminal 1. However, in the communication terminal 1, the storage unit 80 is not essential. When the communication terminal 1 does not include the storage unit 80, the communication terminal 1 may be communicably connected to an external storage device.

[0053] (Control Method of Communication Terminal) FIG. 4 is a flowchart showing an example of a control method of the communication terminal 1. The control method shown in FIG. 4 starts when the handset 20 goes off-hook.

[0054] When the handset 20 goes off-hook, the call control unit 71 determines whether a call by IP wireless communication is being made by the main body side speaker 11 and the main body side microphone 12 at the time when the handset 20 goes off-hook (S1). If a call by IP wireless communication is being made by the main body side speaker 11 and the main body side microphone 12 (YES in S1), the call control unit 71 controls the IP wireless processing unit 72 so that a call by IP wireless communication is made by the handset 20 (S2).

[0055] On the other hand, if a call by IP wireless communication is not being made by the main body side speaker 11 and the main body side microphone 12 (NO in S1), the call control unit 71 outputs a DT tone from the handset side speaker 21 (S3). In that state, the call control unit 71 determines whether the PTT button 14 has been pressed by the user (S4).

[0056] If the PTT button 14 has been pressed by the user (YES in S4), the call control unit 71 controls so that a call by IP wireless communication is made by the handset 20 (S2). If the PTT button 14 has not been pressed by the user (NO in S4), the call control unit 71 controls the IP phone processing unit 73 so that a call by IP phone communication is made by the handset 20 (S5).

[0057] [Example of Realization by Software] The function of the communication terminal 1 (hereinafter referred to as the "device") is a program for causing a computer to function as the device, and can be realized by a program for causing a computer to function as each control block of the device (especially each part included in the control unit 70).

[0058] In this case, the above device includes, as hardware for executing the above program, a computer having at least one control device (for example, a processor) and at least one storage device (for example, a memory). By executing the above program by this control device and storage device, each function described in each of the above embodiments is realized.

[0059] The above program may be recorded on one or more computer-readable recording media, not temporarily. This recording medium may or may not be provided in the above device. In the latter case, the above program may be supplied to the above device via any wired or wireless transmission medium.

[0060] Also, part or all of the functions of each of the above control blocks can also be realized by a logic circuit. For example, an integrated circuit in which a logic circuit functioning as each of the above control blocks is formed is also included in the scope of the present invention.

[0061] 〔Summary〕 The present invention can also be expressed as follows.

[0062] The communication terminal according to Embodiment 1 of the present invention includes a PTT call processing unit that performs a PTT call by the PTT (Push to Talk) method, an IP phone processing unit that performs an IP phone call by SIP (Session Initiation Protocol) via an IP (Internet Protocol) network, a call control unit that controls the PTT call by the PTT call processing unit and the IP phone call by the IP phone processing unit, a main body including a main body side speaker and a main body side microphone, and a handset including a handset side speaker and a handset side microphone. When the handset goes off-hook, the call control unit controls the PTT call to be made by the handset when the PTT call is being made by the main body side speaker and the main body side microphone, and controls the IP phone call to be made by the handset when the PTT call is not being made when the handset goes off-hook.

[0063] According to the above configuration, in a communication terminal capable of both PTT calls and IP phone calls, when the handset goes off-hook, whether the PTT call is being made or not determines whether the handset makes a PTT call or an IP phone call. Therefore, the user can make a call in an appropriate call mode only by taking the handset off-hook.

[0064] The communication terminal according to Embodiment 2 of the present invention, in Embodiment 1, includes a PTT button for starting the utterance by the PTT call. When the handset goes off-hook and neither the PTT call nor the IP phone call is being made, the call control unit causes the handset side speaker to output a dial tone in the IP phone call, and when the PTT button is pressed in this state, starts the PTT call.

[0065] According to the above configuration, when the handset is off-hooked in a state where neither PTT call nor IP phone call is being made, it first stands by in a state where an IP phone call can be started. Then, when the PTT button is pressed, a PTT call is started. Therefore, when the user wants to make an IP phone call, the user simply off-hooks the handset and enters a phone number or the like. When the user wants to make a PTT call, the user off-hooks the handset and presses the PTT button. That is, the user can start a call in a desired mode with natural operations.

[0066] The communication terminal according to Aspect 3 of the present invention includes, in Aspect 1 or 2, a display unit that displays information. When the PTT call is being made, the display unit displays information indicating that the PTT call is being made. When the IP phone call is being made, the display unit displays information indicating that the IP phone call is being made.

[0067] According to the above configuration, the user can easily recognize in which mode a call is being made by checking the display unit.

[0068] The communication terminal according to Aspect 4 of the present invention includes, in Aspect 3, an instruction input unit that receives an instruction input from the user to display at least one of an address book or a phone book, a reception or incoming call history, and a transmission or outgoing call history on the display unit. When the instruction input is received at the time when the PTT call is being made, the display unit displays at least one of an address book, a reception history, and a transmission history related to the PTT call. When the instruction input is received at the time when the IP phone call is being made, the display unit displays at least one of a phone book, an incoming call history, and an outgoing call history related to the IP phone call.

[0069] According to the above configuration, it is possible to display at least one of an address book or a phone book, a reception or incoming call history, and a transmission or outgoing call history on the display unit according to the operating mode.

[0070] In the communication terminal according to Embodiment 5 of the present invention, in Embodiment 3 or 4, when the PTT call is being made, if an incoming call for the IP phone call arrives, or when the IP phone call is being made, if a reception of the PTT call arrives, the display unit displays to that effect, and the call control unit switches from the PTT call to the IP phone call or from the IP phone call to the PTT call in response to an instruction input from the user.

[0071] According to the above configuration, when a PTT call or an IP phone call is being made and an incoming call for the IP phone call or a reception of the PTT call arrives, the user can change to a desired mode based on the display on the display unit.

[0072] In the method for controlling a communication terminal according to Embodiment 6 of the present invention, in any one of Embodiments 1 to 5, the PTT call processing unit makes the PTT call via the IP network.

[0073] According to the above configuration, for a PTT call and an IP phone call via an IP network, the user can make a call in an appropriate call mode only by taking the handset off-hook.

[0074] The control method for a communication terminal according to aspect 7 of the present invention is a control method for a communication terminal including a PTT call processing unit that performs a PTT call by the PTT method, an IP phone processing unit that performs an IP phone call by SIP via an IP network, a main body including a main body side speaker and a main body side microphone, and a handset including a handset side speaker and a handset side microphone. When the handset goes off-hook, if a call by the PTT call is being made by the main body side speaker and the main body side microphone, the step of controlling the PTT call processing unit so that the call by the PTT call is made by the handset, and when the handset goes off-hook and the PTT call is not being made, the step of controlling the IP phone processing unit so that the IP phone call is made by the handset.

[0075] According to the above configuration, the same effects as those of the above-described aspect 1 are achieved.

[0076] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

Explanation of Signs

[0077] 1 Communication terminal 10 Main body 11 Main body side speaker 12 Main body side microphone 13 Hook switch 14 PTT button 15 Display unit 16 Instruction input unit 20 Handset 21 Handset side speaker 22 Handset side microphone 71 Call control unit 72 IP wireless processing unit (PTT call processing unit) 73 IP phone processing unit

Claims

1. A PTT call processing unit that performs PTT calls by the PTT (Push to Talk) method, An IP phone processing unit that performs IP phone calls by SIP (Session Initiation Protocol) via an IP (Internet Protocol) network, A call control unit that controls the PTT calls by the PTT call processing unit and the IP phone calls by the IP phone processing unit, A main body having a main body side speaker and a main body side microphone, A handset having a handset side speaker and a handset side microphone, Comprising, The call control unit, When the handset is off-hooked and the PTT call is being made by the main body side speaker and the main body side microphone, controls so that the PTT call is made by the handset, A communication terminal that, when the handset is off-hooked and the PTT call is not being made, controls so that the IP phone call is made by the handset.

2. Comprising a PTT button for starting a speech by the PTT call, The call control unit, When the handset is off-hooked and neither the PTT call nor the IP phone call is being made, outputs a dial tone in the IP phone call from the handset side speaker, and when the PTT button is pressed in this state, starts the PTT call. The communication terminal according to claim 1.

3. Comprising a display unit for displaying information, The display unit displays information indicating that the PTT call is being made when the PTT call is being made, and displays information indicating that the IP phone call is being made when the IP phone call is being made. The communication terminal according to claim 1 or 2.

4. Comprising an instruction input unit that receives an instruction input from a user to display at least any one of an address book or a phone book, a reception or incoming call history, and a transmission or outgoing call history on the display unit, When the indication input is received at the time when the PTT call is being made, the display unit displays at least any one of the address book, reception history, and transmission history regarding the PTT call, and when the indication input is received at the time when the IP phone call is being made, the display unit displays at least any one of the phone book, incoming call history, and outgoing call history regarding the IP phone call. The communication terminal according to claim 3.

5. When there is an incoming call for the IP phone call while the PTT call is being made, or when there is a reception for the PTT call while the IP phone call is being made, the display unit displays to that effect, and The call control unit switches from the PTT call to the IP phone call or from the IP phone call to the PTT call in response to an indication input from the user. The communication terminal according to claim 3.

6. The PTT call processing unit makes the PTT call via the IP network. The communication terminal according to claim 1.

7. A control method for a communication terminal including a PTT call processing unit that makes a PTT call by the PTT method, an IP phone processing unit that makes an IP phone call by SIP via an IP network, a main body including a main body side speaker and a main body side microphone, and a handset including a handset side speaker and a handset side microphone, comprising: When the handset is off-hook, if a call by the PTT call is being made by the main body side speaker and the main body side microphone, a step of controlling the PTT call processing unit so that the handset makes a call by the PTT call, and When the handset is off-hook and the PTT call is not being made, a step of controlling the IP phone processing unit so that the handset makes an IP phone call. A control method for a communication terminal.

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