JP3832411B2 - Telephone equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a telephone device including a parent device and a plurality of child devices that can be connected to the parent device, and more particularly to control when an extension call is made between the child devices.
[0002]
[Prior art]
  Conventionally, a so-called cordless telephone connected to a public telephone line has a portable handset. Among such telephones, there is a telephone that can make an extension call between slave units via the master unit (see, for example, Patent Documents 1 and 2).
[0003]
[Patent Document 1]
JP-A-8-19051
[Patent Document 2]
JP-A-5-292019
[0004]
  The above-mentioned Japanese Patent Application Laid-Open No. Hei 8-19051 discloses a technique for detecting whether a mobile device is in a call area or out of a call area while waiting for the mobile device to perform an extension call between the slave devices, and notifying that effect. It is disclosed. As a result, the user can recognize that the handset is within the calling range or outside the calling range even when the handset is waiting.
[0005]
[Problems to be solved by the invention]
  However, according to the technology disclosed in the above publication, after detecting and informing whether the communication area is out of standby, no specific processing to recover the connection between the parent device and the child device is performed. This is inconvenient for the user.
[0006]
  The present invention has been proposed in view of the above points, and when a slave unit detects a connection abnormality during an extension call with each other via the master unit, the phone can smoothly restore the connection. An object is to provide an apparatus.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, a telephone device according to a first aspect of the present invention includes a parent device that can communicate with a partner through a line, an extension call that can be connected to the parent device, and is connected to the parent device. A telephone device comprising a plurality of possible slave units, wherein the master unit is, DoubleNumber of handsetsIs in a state of being connected and making an extension call, and in a standby state before the extension call is started.WhenWhile discriminating between these two statesA detecting means for detecting a connection error with any one of the slave units; and the detecting meansOneWhen a connection error with the other handset is detected,otherA link error command transmission means for transmitting a command indicating that a connection error has been detected to the other slave unit;When a command to restore the connection is received from the other slave unit, the command to restore the connection from the other slave unit is in a state where the one and the other slave unit are connected and an extension call is being made. If it corresponds to a connection abnormality in the communication line, it transmits a channel designation command for restoring the connection based on a preset channel for the extension call, while responding to a connection abnormality in the standby state. For example, designated command transmission means for switching to a channel different from the preset channel and transmitting a channel designation command for restoring connection based on the switched channel;And the other slave unit receives a command indicating that a connection error is detected by the link error command transmission means,SaidConnection recovery command transmission means for transmitting a command for restoring the connection to the parent device is provided.
[0008]
  According to such a telephone device, when a connection abnormality is detected in the connection with the one slave unit that is performing an extension call in the master unit, a message to that effect is sent to the other slave unit, and the other Since the slave unit sends a command to restore the connection to the master unit, the master unit performs reconnection processing in accordance with the command to restore the connection. Can be quickly recovered and the extension call can be resumed immediately.On the other hand, when a connection abnormality in the standby state is detected, there is a high possibility that some kind of failure has occurred in a previously set channel (for example, a call channel), so if switching to another channel as described above, Inconveniences such as a failure in the communication channel can be solved, and the connection between the parent device and the child device can be more reliably recovered.In the other slave unit, when a command indicating that a connection abnormality is detected is sent from the master unit, a command for restoring the connection may be automatically transmitted to the master unit. According to this, since the connection between the master unit and the slave unit is automatically recovered, the extension call can be smoothly resumed without giving the user a sense of incongruity.
[0009]
  According to a second aspect of the present invention, there is provided a telephone device according to the first aspect, wherein the other handset is an input signal for transmitting a command for restoring the connection by a user. The connection recovery command transmitting means transmits a command for restoring the connection to the parent device based on the input signal input by the input means.
[0010]
  According to such a telephone device, in addition to the effect of the telephone device according to claim 1, since the connection can be recovered by an input operation by the user, the user recognizes that a connection abnormality has occurred. , Input operation to restore the connection can be performed.
[0011]
  The telephone device according to a third aspect of the present invention is the telephone device according to the first or second aspect, wherein the detecting means responds to a periodic command periodically transmitted to each of the slave units. Then, when a response acknowledge command from any of the slave units is not returned from the slave unit, a connection abnormality is detected.
[0012]
  According to such a telephone apparatus, in addition to the effect of the telephone apparatus according to claim 1 or 2, a connection abnormality is detected when a response acknowledge command in response to a periodic command sent to the slave unit is not returned. Therefore, it is possible to easily detect an abnormal connection between the master unit and the slave unit.
[0013]
[0014]
[0015]
  Claims4The telephone device according to the invention described in claim 11 to 3The base unit is a response command receiving means for receiving a response command from the handset for the channel designation command by the designation command transmission means;In the case of dealing with a connection abnormality in the standby state,When the response command received by the response command receiving unit is an ACK command, the mobile phone further includes a inter-slave unit call command transmitting unit that transmits a inter-slave unit call command to the sub unit.
[0016]
  According to such a telephone device, the claims1 to 3In addition to the effects of the telephone device described inWhen dealing with connection errors in the standby state,When the ACK command is received from the slave unit, the inter-slave unit call command is transmitted to the slave unit, so that the conversation between the slave units can be started smoothly.
[0017]
  Claims5The telephone device according to the invention described in claim 14The telephone device according to claim 1, wherein the master unit isIn the case of dealing with a connection abnormality in the standby state,When the response command received by the response command receiving means is a NACK command, the apparatus further includes switching means for switching the channel to another channel.
[0018]
  According to such a telephone device, the claims4In addition to the effects of the telephone device described inWaiting letter When dealing with connection abnormalities inWhen the NACK command is received from the slave unit, the channel is switched to another channel, so that the connection between the master unit and the slave unit can be recovered more quickly.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
[0020]
  FIG. 1 is a schematic block diagram showing an example of a telephone device according to the present invention. The telephone device includes a parent device 1 including a facsimile device and a child device 2 that can communicate with the parent device 1 wirelessly. For convenience of explanation, the slave units that perform extension calls with each other will be referred to as “slave unit 2A” and “slave unit 2B”, respectively.
[0021]
  Although not shown, the master unit 1 is provided with a plurality of functions such as an inkjet printing function, an image reading function (scanner function), and an image communication function. For example, when transmitting facsimile data, master device 1 reads an original using an image reading function, and transmits the read original data to a destination using a communication function. When the facsimile data is received by the communication function, the contents of the facsimile data are printed on a predetermined recording sheet using the printing function. In addition, this main | base station 1 can also be utilized as a printing apparatus or a scanner in the independent form, for example in the state connected to the personal computer. Further, the printing function and the image reading function can be linked to use as a copier.
[0022]
  The base unit 1 includes a CPU 10, an NCU 11, a RAM 12, a modem 13, a ROM 14, an NVRAM (Non-Volatile RAM) 15, a gate array 16, a codec 17 and a DMAC 18, which are connected to each other by a bus 19. ing. The bus 19 includes an address bus, a data bus, and a control signal line. Further, in the parent device 1, a reading unit 21, a printing unit 22, an operation unit 23, a display unit 24, a cordless control unit 25, a compander 26, and a wireless module 27 are connected to the gate array 16. A public telephone line 28 is connected to the NCU 11. An EEPROM 29 and a compander 26 are connected to the cordless control unit 25. The wireless module 27 is connected to the compander 26 and the cordless control unit 25. The base unit 1 is connected to a handset including a microphone and a speaker (not shown).
[0023]
  The CPU 10 controls the operation of the entire base unit 1. The NCU 11 performs network control by being connected to the public telephone line 28. The RAM 12 provides a work area for the CPU 10. The modem 13 performs modulation and demodulation of voice data and facsimile data. The ROM 14 stores programs to be executed by the CPU 10. The NVRAM 15 stores data and various types of information. The CPU 10 incorporates a timer (not shown) for monitoring the connection state with the handset 2 during an extension call.
[0024]
  The gate array 16 functions as an interface between the CPU 10 and the units 21 to 27. The codec 17 performs encoding and decoding of voice signals, facsimile data, and the like. The DMAC 18 mainly performs writing and reading of data to and from the RAM 12.
[0025]
  The reading unit 21 includes, for example, an image sensor, an LED light source, a document feed motor (all not shown), and the like, and reads an image image from a facsimile document or the like under the control of the CPU 10.
[0026]
  The printing unit 22 prints images such as characters and figures in monochrome or color by a thermal method or the like.
[0027]
  As shown in FIG. 2, the operation unit 23 includes numeric keys 23 </ b> A, a jog dial key 23 </ b> B, other operation keys, and the like, and transmits an input signal by a user's key operation to the CPU 10.
[0028]
  Similarly, as shown in FIG. 2, the display unit 24 includes, for example, a liquid crystal display panel 24A, and displays an operation state, operation guidance, and the like on the liquid crystal display panel 24A.
[0029]
  The wireless module 27 includes an antenna (not shown), and exchanges audio signals and various data with each handset 2 using a control channel and a communication channel.
[0030]
  The compander 26 separates the audio signal and the data signal sent from the slave unit 2 via the wireless module 27 and sends the audio signal to the CPU 10 side and the data signal to the cordless control unit 25 side. Conversely, the audio signal and data signal from the CPU 10 side are sent to the wireless module 27.
[0031]
  The cordless control unit 25 performs control related to communication with the slave unit 2, and the EEPROM 29 is controlled by the cordless control unit 25 and stores, for example, the number of the slave units 2 and the ID number of the added slave unit 2. Is to do.
[0032]
  The subunit | mobile_unit 2 is temporarily installed in the room etc. which are different from the room where the main | base station 1 was installed in the house, for example. As shown in FIG. 1, the slave unit 2 includes a control unit 41, a ROM 42, a RAM 43, an EEPROM 44, and the like, which are connected to each other by a bus 45. A wireless module 46, a compander 47, an operation unit 48, and a display unit 49 are connected to the control unit 41. A compander 47 is connected to the wireless module 46. A speaker 51 and a microphone 52 are connected to the compander 47.
[0033]
  The control unit 41 controls the overall operation of the child device 2. The ROM 42 stores programs to be executed by the control unit 41. The RAM 43 provides a work area for the control unit 41 and the like. The EEPROM 44 stores data and various types of information.
[0034]
  As shown in FIG. 3, the operation unit 48 includes numeric keys 48 </ b> A, a select key 48 </ b> B, and other operation keys, and transmits an input signal corresponding to a user operation to the control unit 41. In the following explanation, an extension key for requesting an extension call, a call key for requesting that oneself speak, a reconnection key for requesting a reconnection, and an extension call are terminated. An end key or the like will be described. By inputting the numeric key 48A, select key 48B, and other operation keys in combination, functions such as an extension key can be substituted.
[0035]
  As shown in FIG. 3, the display unit 49 includes a liquid crystal display panel 49A, for example, and displays an operation state, operation guidance, and the like on the liquid crystal display panel 49A.
[0036]
  The wireless module 46 includes an antenna (not shown), and exchanges audio signals and various data with the parent device 1 and other child devices 2 using a control channel and a communication channel.
[0037]
  The compander 47 separates an audio signal and a data signal sent from the base unit 1 via the wireless module 46 and sends the audio signal to the speaker 51 and the data signal to the control unit 41. In addition, an audio signal from the microphone 52 and a data signal from the control unit 41 are sent to the parent device 1 via the wireless module 46.
[0038]
  The speaker 51 and the microphone 52 are capable of making a call with the parent device 1 and other child devices 2.
[0039]
  Next, the control operation of the telephone apparatus in this configuration will be described with reference to the flow sequence diagrams shown in FIGS. The extension call between the slave units in this telephone device employs a so-called transceiver system. For example, when the slave unit 2A is transmitting, the slave unit 2B is receiving a call. At that time, the slave unit 2B It is assumed that it is not possible to transmit to the machine 2A. The slave unit 2B can transmit the speech after the transmission of the slave unit 2A is completed.
[0040]
  First, in the handset 2A, when an input operation of the extension key of the operation unit 48 by the user is performed and an input to the other side handset (slave handset 2B) to be called is performed, the handset 2A is controlled. A link command for link connection is transmitted to the base unit 1 using the channel (S1).
[0041]
  In response to the link command, base unit 1 returns a call channel designation command to handset 2A (S2). As a result, the call channel is designated, and the inter-slave unit call command is transmitted from the slave unit 2A to the master unit 1 (S3), and the connection between the master unit 1 and the slave unit 2A is established.
[0042]
  Thereafter, the base unit 1 once transmits a disconnect command for disconnecting the connection with the handset 2A (S4), and transmits a link command to each of the handset 2A and the handset 2B (S5). , S6), a call channel designation command is transmitted (S7, S8). As a result, it is possible to talk with both the slave units 2A and 2B, and the master unit 1 alternately transmits the inter-slave unit call command at regular intervals to each of the slave units 2A and 2B (S9, S11, S13, S15). In the slave unit 2A and the slave unit 2B, an ACK command is transmitted to the master unit 1 in response to the inter-slave unit call command (S10, S12, S14).
[0043]
  In addition, when the slave unit 2B receives the inter-slave unit call command from the master unit 1, the slave unit 2B displays a message “Incoming” on the liquid crystal display panel 49A of the display unit 49, and the user presses the extension key of the operation unit 48. When pressed, a standby command is transmitted to the base unit 1 instead of the ACK command (S16).
[0044]
  The master unit 1 that has received the standby command transmits a standby command to the slave unit 2A (S17). Thereafter, until the call key or the like is input, each of the slave unit 2A and the slave unit 2B Standby commands are transmitted alternately at regular intervals (S19, S21, S23, S25). In response to the standby command, slave unit 2A and slave unit 2B transmit an ACK command to master unit 1 (S18, S20, S22, S24), and a standby state is established between both slave units 2A and 2B.
[0045]
  Thereafter, for example, when the user presses the call key of the operation unit 48 in the slave unit 2A, a transmission request command is transmitted to the master unit 1 instead of the ACK command (S26). When the base unit 1 receives the transmission request command, the base unit 1 transmits the transmission request command to the handset 2B (S27), and also transmits the transmission request command to the handset 2A (S29). Thus, the slave unit 2A is in a state in which the extension unit 2A can perform an extension call during transmission.
[0046]
  Here, as shown in FIG. 5, it is assumed that during the extension call in the slave unit 2A and the slave unit 2B, for example, the slave unit 2B has moved out of the talking area, so that a call cannot be made. In this case, if the call key of the operation unit 48 is released in the child device 2A and the transmission from the child device 2A is completed, the child device 2A transmits a standby command to the parent device 1 (S31). In response to this, the base unit 1 thereafter transmits standby commands to both the handset units 2A and 2B (S32, S33, S35, S36, S38).
[0047]
  However, since the handset 2B is out of the communication range, it cannot return an ACK command for the standby command from the base unit 1. The base unit 1 constantly monitors the ACK command from the handset 2B after transmitting the standby command. In this case, if the ACK command for the standby command does not return, for example, three times continuously, a connection error occurs. Is determined.
[0048]
  If the base unit 1 determines that the connection is abnormal, the base unit 1 transmits a link abnormality command indicating that the connection abnormality is detected to the slave unit 2A (S39). In the slave unit 2A that has received this link abnormality command, since an abnormality has occurred in the connection with the slave unit 2B on the liquid crystal display panel 49A of the display unit 49, a display prompting reconnection between the slave unit 2A and the slave unit 2B is displayed. Do.
[0049]
  Here, when the user who visually recognizes the display performs an input operation of the reconnection key of the operation unit 48, the child device 2A transmits a reconnection request command to the parent device 1 (S41).
[0050]
  Thereafter, base unit 1 sends a disconnect command to handset 2A (S42). As a result, the connection between the master unit 1 and the slave unit 2A is temporarily disconnected, and the master unit 1 then sends a link command to the slave units 2A and 2B to connect the slave unit 2A and the slave unit 2B again. In addition to the transmission (S43, S44), a call channel designation command is sent (S45, S46).
[0051]
  As a result, the slave unit 2A and the slave unit 2B are restored to the connection state, and can enter the extension call, and the master unit 1 transmits the inter-slave unit call command to both the slave units 2A and 2B (S47, S49). ). On the other hand, the handset 2A returns an ACK command (S48), and the handset 2B returns a standby command when the extension key is pressed (S50). Thereafter, base unit 1 sends a standby command to both slave units 2A, 2B (S51, S53, S55), and both slave units 2A, 2B enter a standby state. At this time, if the end key is operated in the slave unit 2A, the slave unit 2A sends an end request command to the master unit 1 (S56), and the master unit 1 accordingly sends an end command to the slave unit 2B. (S57).
[0052]
  In this way, the slave unit 2AExtension callWhen a connection error occurs on the handset 2B side, the base unit 1 sends a command to that effect to the handset 2A, and the handset 2A sends a command for restoring the connection to the base unit 1. Therefore, the base unit 1 performs reconnection processing such as sending a call channel designation command to both the handset units 2A and 2B in accordance with the command to restore this connection. Therefore, the connection between the parent device 1 and the child device 2 can be quickly recovered, and the extension call can be immediately resumed. Further, since the connection can be recovered by an input operation by the user, the user can perform the input operation after recognizing that a connection abnormality has occurred.
[0053]
  In the above control, when the slave unit 2A receives a link error command from the master unit 2, the slave unit 2A automatically transmits a reconnection request command to the master unit 1 to restore the connection with the slave unit 2B. It may be. That is, when the slave unit 2A receives the link abnormality command from the master unit 2, the slave unit 2A displays on the display unit 49 that an abnormality has occurred in the connection with the slave unit 2B. In this case, the reconnection request command is unconditionally displayed. Send. Subsequent processing is the same as the control described above.
[0054]
  As described above, if the slave unit 2A automatically transmits a command for restoring the link to the master unit 1, the connection between the master unit 1 and the slave unit 2 is automatically restored. Thus, it is possible to smoothly resume the extension call without giving a sense of incongruity.
[0055]
  Next, the control operation of base unit 1 when a connection abnormality occurs during standby will be described with reference to the flowcharts shown in FIGS.
[0056]
  First, in the base unit 1, during standby, control for monitoring the connection state with the handset 2 is performed. Specifically, as shown in FIG. 6, the cordless control unit 25 of the base unit 1StandbyA standby command is transmitted to the slave unit 2 inside (T1), and a monitoring timer (not shown) is started (T2). The cordless control unit 25 recognizes that the connection state with the slave unit 2 is normal when any command is returned from the slave unit 2 within a predetermined time in response to the standby command. In addition, as shown in the flow sequence diagram of FIG.StandbyIt is alternately sent to the slave unit 2A and the slave unit 2B.
[0057]
  Next, the cordless control unit 25 determines whether or not any command is received from the child device 2. In step T3, it is determined whether or not a transmission request command has been received. If a transmission request command has been received (T3: YES), a transition is made to the transmission mode. The transmission mode is a mode state in which a call with the other handset 2 can be made. In this case, a state in which the handset 2 (for example, the handset 2A) that has transmitted the send request command can send a call. Say.
[0058]
  When the transmission request command is not received (T3: NO), the cordless control unit 25 determines whether the termination request command is received (T4), and when the termination request command is received (T4: YES). ), An end command is transmitted to the handset 2 that has transmitted the end request command (T5). Thereby, the main | base station 1 will be in a standby state.
[0059]
  When the termination request command is not received (T4: NO), the cordless control unit 25 determines whether or not the ACK command is received (T6), and when the ACK command is received (T6: YES), the timer Is reset (T7). And after predetermined time progress (T8: YES), it returns to step T1, and transmits a standby command with respect to the subunit | mobile_unit 2 which transmitted the ACK command.
[0060]
  On the other hand, when the ACK command is not received (T6: NO), the cordless control unit 25 determines whether or not the timer has overflowed (T9), and when the timer has not overflowed (T9: NO), step T3 Return to the determination of whether or not the transmission request command is received.
[0061]
  If it is determined in step T9 that the timer has overflowed (T9: YES), that is, if no command is returned even after a lapse of a certain time from the transmission of the standby command, the cordless control unit 25 Recognizing that an abnormality occurred in the connection status with the machine 2 and an extension call with the slave unit 2 in which the abnormality occurred in the connection statusofA link abnormality command is transmitted to the other handset 2 (T10).
[0062]
  Next, proceeding to FIG. 7, the cordless control unit 25 determines whether or not a reconnection request command is received from the other handset 2 (T11). If a reconnection request command has not been received (T11: NO), it is determined whether an end request command has been received (T12). When the end request command is received (T12: YES), that is, when the user on the other handset 2 side presses the end key to end the extension call, the cordless control unit 25 An end command is transmitted to 2 (T13), and the apparatus is on standby. If no termination request command is received (T12: NO), the process returns to step T11.
[0063]
  In step T11, when a reconnection request command is received (T11: YES), that is, the user on the other side of the slave unit 2 presses the reconnect key for reconnecting to the slave unit 2 in which an abnormality has occurred. In this case, the cordless control unit 25 once transmits a disconnection command to the other handset 2 in order to reconnect the link to both handset 2 (T14). A link command is transmitted (T15).
[0064]
  Next, the cordless control unit 25 determines whether there is a call channel other than the call channel used for the extension call of the two slave units 2 (T16). This is because a call channel other than the call channel used when a connection abnormality occurs is used when the connection is re-established. Because there is a possibility that. In step T16, if there is no call channel (T16: NO), the process proceeds to a process of transmitting an end command in step T13 in order to forcibly end the extension call.
[0065]
  In step T16, when there is a call channel (T16: YES), the cordless control unit 25 selects another appropriate call channel (T17). Then, a call channel designation command including the selected call channel is transmitted (T18).
[0066]
  Thereafter, the cordless control unit 25 determines whether a NACK command is received from the other handset 2 (T19), and if a NACK command is received, the cordless control unit 25 determines whether the call channel of step T16 Return to the presence / absence determination process. When the ACK command is received, the cordless control unit 25 transmits the inter-slave device call command (T20), and shifts to the call mode. The call mode refers to a mode state in which the slave unit 2 on the other side calls the slave unit 2 in which an abnormality has occurred.
[0067]
  As described above, when the base unit 1 receives a command to restore the link from the handset unit 2, the base unit 1 switches to a call channel different from the preset call channel, and specifies the call channel based on the switched call channel. Send a command. When a connection error is detected, there is a high possibility that some trouble has occurred in the call channel that was used before that, so if you switch to another call channel as described above, the call channel has trouble. Thus, the connection between the parent device 1 and the child device 2 can be recovered more reliably.
[0068]
  Next, the control operation of the handset 2 when a link connection abnormality occurs during standby will be described with reference to the flowchart shown in FIG.
[0069]
  The control part 41 of the subunit | mobile_unit 2 determines whether the link abnormal command was received from the main | base station 1 (T31), and when the link abnormal command is received (T31: YES), the liquid crystal display panel of the display part 49 49A is displayed to prompt reconnection (T32). As a result, the user has an anomaly in the link, so whether to reconnect the link or whether to terminate the extension call.please ~Can be judged.
[0070]
  The control unit 41 determines whether or not the end key of the operation unit 48 for ending the extension call is pressed by the user (T33). When the end key is pressed (T33: YES), the end request command Is transmitted to the base unit 1 (T34), and then the standby mode is set.
[0071]
  When it is determined that the end key is not pressed (T33: NO), it is determined whether or not the reconnection key is pressed by the user (T35). When the reconnection key is not pressed (T35: NO), the process returns to step T33. . When the reconnection key is pressed (T35: YES), a reconnection request command is transmitted to the base unit 1 (T36), and a reconnection process is being performed on the liquid crystal display panel 49A of the display unit 49. Display is performed (T37).
[0072]
  Next, the control unit 41 determines whether or not a call channel designation command has been received from the parent device 1 (T38). If the call channel designation command is received (T38: YES), it is included in the call channel designation command. It is determined whether or not the current call channel can be used (T39). If the call channel cannot be used (T39: NO), a NACK command is transmitted to the base unit 1 (T40), and the process returns to the determination process of whether or not the call channel designation command in step T38 has been received.
[0073]
  In step T39, when the call channel is usable (T39: YES), an ACK command is transmitted to the base unit 1 (T41), and then it is determined whether or not the inter-slave unit call command is received (T42). . When the inter-slave unit call command is received (T42: YES), the mode shifts to the call mode.
[0074]
  In the control of the slave unit 2, when a link abnormality command is received from the master unit 1, the user is caused to input a reconnection between the parent and the child. When the process of steps T32 to T35 of the control operation shown in FIG. 8 is deleted and a link abnormality command is received from the parent device 1 (T31: YES), a process (T36) for immediately transmitting a reconnection request command is performed.
[0075]
  In addition, this invention is not limited to the said embodiment. For example, the internal configuration of base unit 1 and handset 2 is not limited to the configuration shown in FIG.
[0076]
【The invention's effect】
  As described above, according to the telephone device of the first aspect of the present invention, when a connection abnormality is detected in the connection with one of the slave units that is performing an extension call, the command is sent to the command. The other slave unit sends a command for restoring the connection to the master unit. Therefore, the master unit processes the reconnection according to the command for restoring the connection. Is done. Therefore, the connection between the master unit and the slave unit can be quickly recovered, and the extension call can be resumed immediately.On the other hand, when a connection abnormality in the standby state is detected, there is a high possibility that some kind of failure has occurred in a previously set channel (for example, a call channel), so if switching to another channel as described above, Inconveniences such as a failure in the communication channel can be solved, and the connection between the parent device and the child device can be more reliably recovered.In the other slave unit, when a command indicating that a connection abnormality is detected is sent from the master unit, a command for restoring the connection may be automatically transmitted to the master unit. According to this, since the connection between the master unit and the slave unit is automatically recovered, the extension call can be smoothly resumed without giving the user a sense of incongruity.
[0077]
  Further, according to the telephone device of the invention described in claim 2, in addition to the effect of the telephone device according to claim 1, since the connection can be recovered by an input operation by the user, the user has an abnormal connection. It is possible to perform an input operation to restore the connection after recognizing that.
[0078]
  Furthermore, according to the telephone device of the invention described in claim 3, in addition to the effect of the telephone device according to claim 1 or 2, when a response command in response to the periodic command sent to the slave unit is not returned Since the connection abnormality is detected, the connection abnormality between the parent device and the child device can be easily detected.
[0079]
[0080]
  And claims4According to the telephone device of the invention described in claim 1,One of 3When the ACK command is received from the slave unit, the inter-slave unit call command is transmitted to the slave unit, so that the conversation between the slave units can be started smoothly.
[0081]
  And claims5According to the telephone device of the invention described in claim4When the NACK command is received from the slave unit, the channel is switched to another channel when the NACK command is received from the slave unit, so that the connection between the master unit and the slave unit can be recovered more quickly.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of a telephone device according to the present invention.
FIG. 2 is a diagram showing a panel surface of the master unit.
FIG. 3 is an external view of a slave unit.
FIG. 4 is a flow sequence diagram showing exchange of commands between a parent device and a child device.
FIG. 5 is a flow sequence diagram showing exchange of commands between a parent device and a child device.
FIG. 6 is a flowchart showing a control operation of the master unit.
FIG. 7 is a flowchart showing a control operation of the master unit.
FIG. 8 is a flowchart showing a control operation of the slave unit.
[Explanation of symbols]
    1 Facsimile device (master unit)
    2 handset
    2A One handset
    2B Other handset
  25 Cordless control unit
  28 Public telephone line
  41 Control unit
  49 Display (child unit)
  49A liquid crystal display panel (slave unit)

Claims (5)

A telephone device comprising: a master unit capable of communicating with a partner through a line; and a plurality of slave units connectable to the master unit and capable of making an extension call via the master unit,
The base unit is
Double herring roe machine to each other, when connected to a state of performing extension call and the extension call before the start waiting state der Rutoki detects abnormal connection between the while discriminating these two states either handset Detection means;
When detecting a connection fault between the hand of the handset by the detecting means, and link failure command transmission means for transmitting to the other side of the handset, the command to the effect that connection abnormality is detected,
When a command to restore the connection is received from the other slave unit, the command to restore the connection from the other slave unit is in a state where the one and the other slave unit are connected and an extension call is made. If it corresponds to a connection abnormality, it transmits a channel designation command for recovering the connection based on a preset channel for the extension call, while it corresponds to a connection abnormality in the standby state. Switching to a channel different from the preset channel, and a specified command transmitting means for transmitting a channel specifying command for recovering the connection based on the switched channel ,
The other handset is
When a command indicating an abnormality is detected connection is received by the link failure command transmitting means, telephone characterized in that it comprises a connection recovery command transmission means for transmitting commands to be recovering the connection to the base unit apparatus. The other handset is
An input means capable of inputting an input signal for transmitting a command to restore the connection by the user;
The connection recovery command transmission means includes
2. The telephone device according to claim 1, wherein a command for restoring connection is transmitted to the parent device based on an input signal input by the input means. The detection means includes
The connection abnormality is detected when a response acknowledge command from any of the slave units is not returned from the slave unit in response to a periodic command periodically sent to each of the slave units. Telephone equipment. The base unit is
A response command receiving means for receiving a response command from the slave in response to a channel specifying command by the specified command transmitting means;
In the case of dealing with a connection abnormality in the standby state, when the response command received by the response command receiving unit is an ACK command, the inter-slave unit call command transmitting unit transmits the inter-slave unit call command to the slave unit The telephone device according to claim 1, further comprising: The base unit is
5. The apparatus according to claim 4 , further comprising a switching unit that switches the channel to another channel when the response command received by the response command receiving unit is a NACK command in the case of dealing with a connection abnormality in the standby state. Telephone device.

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