JP5163579B2 - Telephone system, telephone control method, and cordless cordless handset - Google Patents

Description

  The present invention relates to a telephone control technique, and more particularly to a telephone call technique in the event of a disaster caused by a cordless cordless handset accommodated in a telephone system.

  In a telephone system such as a button telephone system or a PBX system, a cordless telephone may be used as a telephone accommodated in a main control unit or a telephone control device such as a PBX. This cordless telephone is composed of a parent device connected to the telephone control device via a wired line, and a cordless child device connected to the parent device via a wireless line, and has a call path formed via the wireless line. The cordless handset is used to make a call through the telephone control device.

In such a telephone system, when a disaster such as an earthquake or torrential rain occurs, users can check each other's safety and disaster status by making a voice call between each telephone accommodated in the extension. .
When such disasters occur, there are many cases where power outages occur simultaneously. Therefore, when a power failure occurs, the power supply to the telephone control device and the base unit is stopped, so that the cordless handset itself can operate with the secondary battery, but cannot make a call as normal.

As a known technique for realizing a call during such a power failure, a backup battery is installed in the parent device so that it can be operated even during a power failure (see, for example, Patent Document 1), or placed in the parent device. A technique (for example, refer to Patent Document 2) has been proposed in which a secondary battery of a cordless slave unit is operated even when a power failure occurs.
However, when a cordless telephone is accommodated in the telephone control device, an extension call is performed via the telephone control device. Therefore, even when an extension call is made between cordless slave units, the entire telephone system is operated. There is a need. Therefore, a large-scale secondary battery is required for users of each cordless cordless handset to obtain sufficient talk time to confirm the safety and the disaster situation with each other, which increases the cost of the entire system. .

  Conventionally, in a cordless telephone system in which a plurality of cordless slave units are accommodated in a common extension in one master unit, voice data is transmitted via the master unit by using an empty time slot for wireless communication established between the parent and the slave unit. A technique has been proposed in which a telephone conversation is performed directly between cordless slaves by exchanging (for example, see Patent Document 3).

Japanese Patent Laid-Open No. 4-262651 JP-A-6-152705 JP-A-8-098243

  However, in such a conventional technology, since the idle time slot of the wireless communication established between the parent and child is used, when the parent device fails, the wireless communication between the parent and child is interrupted and audio data is transmitted via the parent device. As a result, the direct call between cordless cordless handsets is interrupted. Therefore, in order to enable a call between cordless cordless handsets even in the event of a power failure, a backup secondary battery for operating the entire telephone system is required, as in the known technology described above. However, in order to obtain sufficient call time for confirming the safety and the disaster situation with each other, a large-scale secondary battery is required, which increases the cost of the entire telephone system.

  The present invention is for solving such a problem, and even if a power failure occurs at the time of a disaster without requiring a backup secondary battery for operating the entire telephone system, a call between cordless slave units is possible. Is intended to provide a telephone system, a telephone control method, and a cordless cordless handset.

  In order to achieve such an object, the telephone system according to the present invention comprises a set of a base unit and a cordless handset that operates on a battery, and uses a mutual link to establish a link between the two. A cordless handset that includes a plurality of cordless telephones that perform wireless communication and a telephone control device that accommodates these cordless telephones in an extension, and the cordless handset, when the link with its own base is disconnected, Switch the operation mode from normal mode to call out to the power outage mode that allows direct communication with other cordless handset without going through the main unit and link from the main unit in power outage mode In response to the establishment request, an operation mode switching unit that switches its own operation mode from the power failure mode to the normal mode, and a cordless slave unit other than itself in the power failure mode In response to the call operation, a link is established with the partner cordless slave unit and a direct call is made. When switching from the power failure mode to the normal mode, the link with the partner cordless slave unit is disconnected, And a communication control unit for reestablishing a link with the machine.

In addition to this , in the operation mode switching unit, in response to the emergency call received from the telephone control device via its own base unit, the report information included in the emergency call is displayed on the display unit, and the emergency call Set the detection period for link disconnection detection based on the reception time or the estimated disaster occurrence time notified by the emergency call, and if the link with the base unit is disconnected within the detection period When switching to the power failure mode and the link is disconnected outside the detection period, the operation mode is maintained in the normal mode, and if the communication control unit disconnects the link with its parent device in the normal mode, it is obtained so as to re-establish the link in response to the link establishment request from the machine.

  Further, the telephone control method according to the present invention comprises a set of a base unit and a cordless slave unit that operates on a battery, and performs wireless communication via a link established between the two using mutual identification information. A telephone control method used in a telephone system including a cordless telephone and a telephone control device that accommodates these cordless telephones. When a cordless slave unit is disconnected from its own master unit, Switch from the normal mode for making calls via the main unit to the power outage mode that allows direct calls with other cordless slave units without going through the main unit, and establish a link from the main unit in the power outage mode An operation mode switching step for switching the operation mode from the power failure mode to the normal mode upon request, and cordless other than self in the power failure mode In response to the call operation on the machine, establish a link with the partner cordless slave unit and perform a direct call. When switching from power failure mode to normal mode, disconnect the link with the partner cordless slave unit, A communication control step for re-establishing a link with the base unit.

In addition to this , in the operation mode switching step, in response to an emergency call from the telephone control device received via its own master unit, the report information included in the emergency call is displayed on the display unit, and the emergency call Set the detection period for link disconnection detection based on the reception time or the estimated disaster occurrence time notified by the emergency call, and if the link with the base unit is disconnected within the detection period When switching to the power failure mode and the link is disconnected outside the detection period, the normal operation mode is maintained in the normal mode.If the link with the main unit is disconnected in the normal mode in the communication control step, it is obtained so as to re-establish the link in response to the link establishment request from the machine.

  Further, the cordless slave unit according to the present invention includes a pair of a master unit and a cordless slave unit that operates on a battery, and uses a plurality of identification information to perform wireless communication via a link established between the two. A cordless handset that is used in a telephone system including a cordless telephone and a telephone control device that accommodates these cordless telephones. When a link with its own base is broken, a call is made via the base. Switch the operation mode from the normal mode to the power failure mode that allows direct calls with other cordless slave devices without going through the parent device, and in response to a link establishment request from the parent device in the power failure mode, An operation mode switching unit that switches its own operation mode from the power failure mode to the normal mode, and a call operation for a cordless slave unit other than itself in the power failure mode Accordingly, establish a link with the corresponding cordless cordless handset, perform a direct call, disconnect the link with the partner cordless cordless handset when switching from power failure mode to normal mode, and then link with the cordless cordless handset. And a communication control unit for re-establishing.

In addition to this , in the operation mode switching unit, in response to the emergency call received from the telephone control device via its own base unit, the report information included in the emergency call is displayed on the display unit, and the emergency call Set the detection period for link disconnection detection based on the reception time or the estimated disaster occurrence time notified by the emergency call, and if the link with the base unit is disconnected within the detection period When switching to the power failure mode and the link is disconnected outside the detection period, the operation mode is maintained in the normal mode, and if the communication control unit disconnects the link with its parent device in the normal mode, it is obtained so as to re-establish the link in response to the link establishment request from the machine.

  ADVANTAGE OF THE INVENTION According to this invention, a telephone call can be performed directly between the cordless subunit | mobile_units which operate | move with a battery, without passing through a telephone control apparatus or a main | base station. As a result, without the need for a secondary battery for backup that operates the entire telephone system, even if a power outage occurs in the event of a disaster, it is sufficient for the users of each cordless handset to check each other's safety and disaster status Long talk time.

It is a block diagram which shows the structure of the telephone system concerning this Embodiment. It is a block diagram which shows the structure of the cordless cordless handset concerning this Embodiment. It is a block diagram which shows the structure of the main | base station concerning this Embodiment. It is a flowchart which shows the power failure control process of the cordless cordless handset concerning this Embodiment. It is a sequence diagram which shows the power failure operation | movement of the telephone system concerning this Embodiment.

Next, an embodiment of the present invention will be described with reference to the drawings.
[Configuration of the embodiment]
First, a telephone system according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a telephone system according to the present embodiment.

  This telephone system 1 is cordless that operates with a base unit 20 (20A, 20B, ..., 20N) that performs wireless communication between each other using mutual identification information and a battery (hereinafter referred to as a battery) including a secondary battery. A plurality of cordless telephones 30 (30A, 30B,..., 30N), each of which is paired with a handset 10 (10A, 10B,..., 10N), and the cordless telephones 30 are accommodated as extensions and connected to the telephone network NW. Phone control device 40.

Specific examples of the telephone system 1 include a button telephone system and a PBX system. For example, in the case of a button telephone system, the main apparatus and the telephone server correspond to the telephone control apparatus 40, and in the case of a PBX system, the PBX corresponds to the telephone control apparatus 40.
The telephone network NW is connected to a known emergency call system 50 that notifies an emergency call such as an emergency earthquake bulletin or a tsunami bulletin regarding a disaster that an organization such as the Japan Meteorological Agency anticipates. When an emergency disaster that requires notification occurs, the emergency call system 50 notifies the communication device such as the telephone control device 40 that has contracted in advance via the telephone network NW.

  In the telephone system according to the present embodiment, when the cordless handset 10 is disconnected from its own base unit 20, the normal mode in which a call is made via the base unit 20 passes through the base unit 20. Without switching the operation mode to the power outage mode in which direct communication with the cordless handset 10 other than the self is possible, and from the power outage mode to the normal mode in response to a link establishment request from the base unit 20 in the power outage mode. It is assumed that its own operation mode is switched, and in response to a call operation to the cordless slave unit 10 other than the self in the power failure mode, a link is established with the partner cordless slave device 10 and a direct call is performed. At the time of switching to the mode, after the link with the partner cordless slave unit 10 is disconnected, the link with the master unit 20 is re-established. .

[Cordless cordless handset]
Next, the configuration of the cordless slave unit of the telephone system according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the cordless cordless handset of the telephone system according to the present embodiment.

  The cordless handset 10 as a whole includes a wireless communication terminal that operates on a battery and performs wireless communication with the base unit 20 and the cordless handset 10, and includes a control unit 11, a storage unit 12, an operation input unit as main functional units. 13, a display unit 14, a wireless interface unit (hereinafter referred to as a wireless I / F unit) 15, and an audio processing unit 16 are provided, and these functional units are connected to each other via a common bus.

  The cordless handset 10 according to the present embodiment has two types of operation modes, a normal mode and a power failure mode. Among these, the normal mode is an operation mode in which a call is made via the parent device, and the power failure mode is an operation mode in which a direct call can be made with a cordless child device 10 other than itself without going through the parent device. . The control unit 11 operates by switching these operation modes according to its own situation.

  The control unit 11 includes a CPU and its peripheral circuits, and has a function of controlling the entire cordless child device 10 by reading a program from the storage unit 12 and executing it. As main processing units provided in the control unit 11, there are a communication control unit 11A and an operation mode switching unit 11B.

  11 A of communication control parts respond | correspond to the function which controls the radio | wireless communication with the main | base station 20 which used the radio | wireless I / F part 15, and cordless slave units other than self, and the call operation with respect to cordless slave units 10 other than self in a power failure mode Then, after establishing a link with the counterpart cordless cordless handset 10 and performing a direct call, and when switching from the power failure mode to the normal mode, the link with the counterpart cordless cordless handset 10 is disconnected, 20 and a function for reestablishing the link in response to a link establishment request from the parent device 20 when the link with the parent device 20 is disconnected in the normal mode. doing.

  The operation mode switching unit 11B has a function of displaying the notification information included in the emergency call on the display unit 14 in response to the emergency call from the telephone control device 40 received via its own base unit 20, and the emergency call When the link with the main device 20 is disconnected within the detection period, and a function for setting a detection period for link disconnection detection based on the received time of the disaster or the estimated disaster occurrence time notified by the emergency call A function for switching the own operation mode held in the storage unit 12 from the normal mode to the power failure mode, a function for maintaining the own operation mode in the normal mode when the link is disconnected outside the detection period, and a power failure mode. In response to a link establishment request from the base unit 20 in the system, it has a function of switching its own operation mode held in the storage unit 12 from the power failure mode to the normal mode.

The storage unit 12 has a function of storing programs used for processing in the communication control unit 11A and the operation mode switching unit 11B and various processing information. Main processing information stored in the storage unit 12 includes its own operation mode, identification information of the parent device 20 paired with the cordless child device 10, identification information and extensions of all cordless child devices 10 used in the telephone system 1. There are numbers.
The operation input unit 13 includes various operation keys such as dial keys and function keys, and has a function of detecting a user operation and outputting it to the communication control unit 11A and the operation mode switching unit 11B.
The display unit 14 includes a display circuit such as an LCD or an LED, and displays various information such as notification information notified by its own operation mode or emergency notification in response to an instruction from the communication control unit 11A or the operation mode switching unit 11B. It has a function to display.

The wireless I / F unit 15 is composed of a dedicated wireless circuit, and based on a wireless communication protocol such as Bluetooth (registered trademark) or wireless LAN, the wireless I / F unit 15 communicates with a communication partner including the parent device 20 and the cordless child device 10 other than itself. Has a function of establishing a link between them and performing wireless communication via this link.
The audio processing unit 16 includes a dedicated audio processing circuit, decodes audio data received via the wireless I / F unit 15 into an audio signal, outputs the audio signal from the speaker, and converts an input audio signal from the microphone into audio data. It has a function of encoding and outputting to the wireless I / F unit 15 and a function of outputting various signal sounds such as a ringtone from a speaker in response to an instruction from the control unit 11.

[Base unit]
Next, with reference to FIG. 3, the structure of the main | base station of the telephone system concerning this Embodiment is demonstrated. FIG. 3 is a block diagram showing the configuration of the base unit of the telephone system according to the present embodiment.
The base unit 20 as a whole is composed of a wireless communication terminal that operates by the power supply from the telephone control device 40 and performs wireless communication with the cordless handset 10, and includes a control unit 21, a storage unit 22, an operation unit as main functional units. An input unit 23, a display unit 24, a wireless interface unit (hereinafter referred to as a wireless I / F unit) 25, a voice processing unit 26, and a communication interface unit (hereinafter referred to as a communication I / F unit) 27 are provided. The functional units are connected to each other via a common bus.

The control unit 21 includes a CPU and its peripheral circuits, and has a function of controlling the entire master device 20 by reading a program from the storage unit 22 and executing it.
The storage unit 22 has a function of storing a program used for processing in the control unit 21 and various processing information. The main processing information stored in the storage unit 22 includes the identification information of the cordless child device 10 paired with the parent device 20 and the identification information of all the cordless child devices 10 used in the telephone system 1.

The operation input unit 23 includes various operation keys such as dial keys and function keys, and has a function of detecting a user operation and outputting the operation to the control unit 21.
The display unit 24 includes a display circuit such as an LCD or an LED, and has a function of displaying various types of information in accordance with instructions from the control unit 21.

The wireless I / F unit 25 is composed of a dedicated wireless circuit, establishes a link with the cordless handset 10 based on a wireless communication protocol such as Bluetooth or wireless LAN, and the cordless cord via the link. It has a function of performing wireless communication with the slave unit 10.
The audio processing unit 26 includes a dedicated audio processing circuit, decodes audio data received via the wireless I / F unit 25 into an audio signal, outputs the audio signal from the speaker, and converts an input audio signal from the microphone into audio data. It has a function of encoding and outputting to the wireless I / F unit 25, and a function of outputting various signal sounds such as ringtones from a speaker in response to an instruction from the control unit 21.
The communication I / F unit 27 includes a dedicated communication circuit, and has a function of performing data communication with the telephone control device 40 via an extension transmission line formed of a wired line.

  In the telephone system 1 according to the present embodiment, the telephone control device 40 has a generally known configuration, and a detailed description thereof is omitted here. Further, a telephone device other than the cordless telephone 30 may be connected to the telephone control device 40. The telephone network NW may be an analog public telephone network, or a digital ISDN or IP telephone network.

[Operation of this embodiment]
Next, the operation of the telephone system according to the present embodiment will be described with reference to FIG. Here, the power failure control operation in the cordless handset 10 will be described. FIG. 4 is a flowchart showing the power failure control process of the cordless child device according to the present embodiment.

  When the control unit 11 of the cordless handset 10 receives an emergency call from the telephone control device 40 via its own base unit 20 by the wireless I / F unit 15 while operating in the normal mode, the operation mode switching unit 11B After the notification information notified by the received emergency call is displayed on the display unit 14, the power failure control process of FIG. 4 is executed. This emergency call includes types such as an earthquake early warning and a tsunami warning, and notification information such as a disaster occurrence area, a disaster content, and a disaster occurrence estimated time expected by an organization such as the Japan Meteorological Agency is notified.

  In the power failure control process, first, the control unit 11 uses the operation mode switching unit 11B to set the reception time of the emergency call or the estimated disaster occurrence time notified by the emergency call as a reference time, before and after or including the reference time. After the time, a detection period for detecting link disconnection is set (step 100), and the execution of the subsequent process is waited until the detection period starts using the timer function of the CPU (step 101).

For the detection period, the time used as the reference time and the time position and time length of the detection period may be set in advance in the storage unit 12 for each type of emergency call.
For example, in the case of emergency earthquake warning, there is not much time difference between the time of receipt of the earthquake early warning and the estimated earthquake occurrence time, the variation in estimated earthquake occurrence time is small, and if a power failure occurs, several minutes from the occurrence of the earthquake There is a high possibility that a power outage will occur. Therefore, the detection period may be within 10 minutes from the time when the earthquake early warning is received or the estimated earthquake occurrence time notified by the earthquake early warning.
In the case of a tsunami warning, the time difference between the reception time of the earthquake early warning and the estimated tsunami arrival time is large, and the variation in the estimated tsunami arrival time is also large. Therefore, the detection period may be 30 minutes before and after the estimated tsunami arrival time notified by the tsunami warning (1 hour in total).

Next, after the detection period starts, the operation mode switching unit 11B uses the wireless I / F unit 15 to check whether or not the link for wireless communication with the parent device 20 is disconnected (step 102), and the link disconnection is confirmed. If not (step 102: NO), the end of the detection period is confirmed (step 103).
Here, when the end of the detection period is confirmed (step 103: YES), the series of power failure control operations is ended, and when the detection period has not ended (step 103: NO), the process returns to step 102.

  On the other hand, when link disconnection is confirmed in step 102, the operation mode switching unit 11B switches its own operation mode held in the storage unit 12 from the normal mode to the power failure mode (step 110), and the link establishment standby state. It becomes.

  In the link establishment standby state, when the operation input unit 13 detects a call operation to the cordless child device 10 other than the self that has designated the extension number (step 111: YES), the control unit 11 uses the communication control unit 11A. Then, identification information of the cordless slave unit corresponding to the extension number is acquired from the storage unit 12, and a link is established with the partner cordless slave unit 10 based on the identification information and called (step 112). In response to a response from the partner cordless handset 10 to this call, a direct call is started with the partner cordless handset 10 (step 113).

  Thereafter, when the operation end unit 13 detects an end-of-call operation, the call with the counterpart cordless handset 10 is terminated, and a call operation to the new cordless handset 10 is detected by the operation input unit 13. In such a case, the above-described steps 112 and 113 may be repeatedly executed after the previous link is disconnected.

On the other hand, in the link establishment standby state, when the wireless I / F unit 15 receives a link establishment request from the parent device 20 (step 114), the control unit 11 holds the storage unit 12 with the operation mode switching unit 11B. The self-operated operation mode is switched from the power failure mode to the normal mode (step 115).
Thereafter, when the communication control unit 11A establishes a link with the cordless slave unit 10 other than itself, the control unit 11 disconnects the link and then establishes the link with the base unit 20. (Step 116), a series of power failure control operations is terminated.

FIG. 5 is a sequence diagram showing the power failure operation of the telephone system according to the present embodiment.
When an emergency call is notified from the emergency call system 50 to the telephone control device 40 in a state where the base unit 20A, 20B has established a link with the cordless handset 10A, 10B forming a pair (step 200) (step 201) The telephone control device 40 notifies the cordless handset 10A, 10B of the received emergency call via the respective base unit 20A, 20B (steps 202, 203).

  Cordless cordless handset 10A, 10B receives the emergency report from telephone control device 40, displays the report information (step 204), and according to the stop of telephone system 1 due to a power failure (step 205), within the detection period When disconnection of the link with each of the parent devices 20A and 20B is detected (step 206), the normal mode is shifted to the power failure mode and the link establishment standby state is entered (step 207).

  In the power failure mode, when a call operation is performed on the cordless slave unit 10B by the cordless slave unit 10A (step 210), the cordless slave unit 10A notifies the cordless slave unit 10B of a link establishment request and responds accordingly. In response to the OK notification from the cordless handset 10B, a link is established between the two. Thereafter, when a response notification is returned from the cordless handset 10B in response to a call notification from the cordless handset 10A, a direct call is started between the two without going through the base units 20A, 20B.

Thereafter, when the telephone system is restarted by power recovery (step 220), a link establishment request 221 is notified from the parent device 20A to the cordless child device 10A (step 221). Corresponding to this, the cordless slave unit 10A shifts from the power failure mode to the normal mode (step 222), disconnects the link with the cordless slave unit 10B (step 223), and then transmits an OK notification to the master unit 20A. (Step 224). As a result, the link is re-established between the parent device 20A and the cordless child device 10A (step 225).
Steps 221 to 225 are also executed in parallel between the parent device 20B and the child device 10B.

[Effects of the present embodiment]
As described above, according to the present embodiment, when the link with the parent device 20 of the cordless child device 10 is disconnected, the normal mode in which a call is made via the parent device 20 passes through the parent device 20. Without switching the operation mode to the power outage mode in which direct communication with the cordless handset 10 other than the self is possible, and from the power outage mode to the normal mode in response to a link establishment request from the base unit 20 in the power outage mode. It is assumed that its own operation mode is switched, and in response to a call operation to the cordless slave unit 10 other than the self in the power failure mode, a link is established with the partner cordless slave device 10 and a direct call is performed. At the time of switching to the mode, after the link with the partner cordless slave unit 10 is disconnected, the link with the master unit 20 is re-established.

  Therefore, it is possible to make a direct call between cordless cordless handsets operating on batteries without going through the telephone control device 40 or the base unit 20. As a result, without the need for a secondary battery for backup that operates the entire telephone system, even if a power outage occurs in the event of a disaster, it is sufficient for the users of each cordless handset to check each other's safety and disaster status Long talk time.

  In the present embodiment, since the emergency mode is received and the link with the base unit 20 is disconnected within the detection period, the normal mode is switched to the power failure mode. It is possible to suppress a direct call between the cordless slave units 10 in a power outage that is not accompanied by a disaster, such as a stoppage, and it is possible to stably operate the telephone system.

Moreover, although this embodiment demonstrated as an example the case where execution of a power failure control process was started in each cordless cordless handset 10 based on the emergency call from the emergency call system 50, it is not limited to this. For example, in the known technology, when a power failure is detected in the telephone control device 40, there is a function of notifying each extension telephone of the power failure detection before stopping the system. Therefore, the execution of the power failure control process may be started in each cordless handset 10 based on this power failure detection notification. At this time, when the telephone system is stopped due to the maintenance, if the telephone control device 40 is controlled to stop the notification of the power outage, the scheduled power outage without any disaster such as the telephone system being stopped due to the maintenance is stopped. The direct call between the cordless handset 10 can be suppressed, and the telephone system can be stably operated.
Further, the operation mode of the slave unit may be switched by an operation from the master unit such as a link release request from the master unit to the slave unit or a call start request between the slave units.

  DESCRIPTION OF SYMBOLS 1 ... Telephone system 10, 10A, 10B, ..., 10N ... Cordless cordless handset, 11 ... Control part, 11A ... Communication control part, 11B ... Operation mode switching part, 12 ... Memory | storage part, 13 ... Operation input part, 14 ... Display unit, 15 ... Wireless I / F unit, 16 ... Audio processing unit, 20, 20A, 20B, 20C, ..., 20N ... Master unit, 21 ... Control unit, 22 ... Storage unit, 23 ... Operation input unit, 24 ... Display unit, 25 ... Wireless I / F unit, 26 ... Audio processing unit, 27 ... Communication I / F unit, 30, 30A, 30B, 30C, ..., 30N ... Cordless phone, 40 ... Telephone control device, NW ... Telephone network 50 ... Emergency call system.

Claims (3)

A set of a cordless cordless handset that is operated by a battery and a cordless cordless handset, and that accommodates a plurality of cordless phones that perform wireless communication via a link established between the two using identification information of each other and these cordless phones. A telephone system including a telephone control device,
The cordless handset is
When the link with its own base unit is disconnected, the normal mode in which a call is made via the base unit is changed to a power outage mode in which a direct call can be made with the cordless handset other than the self without using the base unit. An operation mode switching unit that switches its own operation mode from the power failure mode to the normal mode in response to a link establishment request from the parent device in the power failure mode, while switching its own operation mode,
In response to a call operation on the cordless slave unit other than the self in the power failure mode, a link is established with the partner cordless slave device to perform the direct call, and when switching from the power failure mode to the normal mode, A communication control unit for reestablishing a link with the master unit after disconnecting the link with the partner cordless slave unit ,
The operation mode switching unit displays the notification information included in the emergency call on the display unit according to the emergency call from the telephone control device received via its own base unit, and the reception time of the emergency call or A detection period for link disconnection detection is set based on the estimated disaster occurrence time notified by the emergency call, and when the link with the base unit is disconnected within the detection period, the operation mode is changed to the power failure. Switch to mode, when the link is disconnected outside the detection period, to maintain its normal operation mode as the normal mode,
The telephone system according to claim 1, wherein the communication control unit reestablishes the link in response to a link establishment request from the parent device when the link with the own parent device is disconnected in the normal mode . A set of a cordless cordless handset that is operated by a battery and a cordless cordless handset, and that accommodates a plurality of cordless phones that perform wireless communication via a link established between the two using identification information of each other and these cordless phones. A telephone control method used in a telephone system including a telephone control device,
The cordless handset is
When the link with its own base unit is disconnected, the normal mode in which a call is made via the base unit is changed to a power outage mode in which a direct call can be made with the cordless handset other than the self without using the base unit. An operation mode switching step for switching the operation mode from the power failure mode to the normal mode in response to a link establishment request from the parent device in the power failure mode, as well as switching its operation mode.
In response to a call operation on the cordless slave unit other than the self in the power failure mode, a link is established with the partner cordless slave device to perform the direct call, and when switching from the power failure mode to the normal mode, A communication control step of re-establishing a link with the master unit after disconnecting the link with the partner cordless slave unit ,
In the operation mode switching step, in response to an emergency call from the telephone control device received via its own master unit, the report information included in the emergency call is displayed on the display unit, and the time when the emergency call is received or A detection period for link disconnection detection is set based on the estimated disaster occurrence time notified by the emergency call, and when the link with the base unit is disconnected within the detection period, the operation mode is changed to the power failure. Switch to mode, when the link is disconnected outside the detection period, to maintain its normal operation mode as the normal mode,
In the communication control step, when the link with its own base unit is disconnected in the normal mode, the link control method re-establishes the link in response to a link establishment request from the base unit . A set of a cordless cordless handset that is operated by a battery and a cordless cordless handset, and that accommodates a plurality of cordless phones that perform wireless communication via a link established between the two using identification information of each other and these cordless phones. A cordless handset used in a telephone system including a telephone control device;
When the link with its own base unit is disconnected, the normal mode in which a call is made via the base unit is changed to a power outage mode in which a direct call can be made with the cordless handset other than the self without using the base unit. An operation mode switching unit that switches its own operation mode from the power failure mode to the normal mode in response to a link establishment request from the parent device in the power failure mode, while switching its own operation mode,
In response to a call operation on the cordless slave unit other than the self in the power failure mode, a link is established with the partner cordless slave device to perform the direct call, and when switching from the power failure mode to the normal mode, A communication control unit for reestablishing a link with the master unit after disconnecting the link with the partner cordless slave unit ,
The operation mode switching unit displays the notification information included in the emergency call on the display unit according to the emergency call from the telephone control device received via its own base unit, and the reception time of the emergency call or A detection period for link disconnection detection is set based on the estimated disaster occurrence time notified by the emergency call, and when the link with the base unit is disconnected within the detection period, the operation mode is changed to the power failure. Switch to mode, when the link is disconnected outside the detection period, to maintain its normal operation mode as the normal mode,
The communication control unit re-establishes the link in response to a link establishment request from the parent device when the link with its own parent device is disconnected in the normal mode .

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