JP2009044218A - Extension telephone system and structuring method for extension telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technique for eliminating a break of a voice when speech communication is carried on while a master unit and a slave unit are switched during the speech communication for an extension telephone system using a main device. <P>SOLUTION: A radio AP 3 and the master unit 21 are connected to an extension network 4 and the slave unit 22 is also connected to the extension network 4 through the radio AP 3. The main device 1 accommodating the extension network 4 and an outside-wire network 5 is made to manage correspondence relation between the master unit 21 and the slave unit 22 constituting an extension telephone device 2; when switching of a connection destination of a voice path to the extension telephone device 2 between the master unit 21 and slave unit 22 constituting the extension telephone device 2 is instructed according to the mounting state of the slave unit 22 on the master unit 21, a predetermined time difference is given between instructions to the master unit 21 and slave unit 22 and voice data from a communication partner are sent to both the master unit 21 and slave unit 22 within the predetermined time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a system including a parent / child phone under the control of a private branch exchange or a key telephone main device, and more particularly, to a technique for preventing call voice interruption in switching between a parent device and a child device during a call.

  Patent Document 1 discloses a curled cordless button telephone apparatus in which a key telephone base unit and a base station are connected to a main apparatus, and a call can be made by a cordless slave unit via the base station. This curled cordless button telephone apparatus determines that the user of the slave unit is at the location of the master unit when the slave unit is placed on the master unit and is being charged, and accepts an incoming call from an outside line or extension line. If the terminal is not being charged and the terminal is not being charged, it is determined that the user of the handset is not at the base station, and an incoming call from an outside line or extension is received by the handset.

JP-A-7-240951

  However, in the case of the curled cordless button telephone device described in Patent Document 1, in order to continue the call while switching between the master unit and the slave unit during a call, it is necessary to perform some transfer switching control in the main unit. Since the call voice was interrupted during this period, there was a drawback that the smooth progress of the conversation was hindered.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to eliminate a voice interruption when a call is continued while switching between a parent device and a child device during a call in a parent-child phone system using a main device. It is to provide a technology that can.

  In order to solve the above-described problems, in the present invention, a wireless access point and an extension telephone master are connected to an extension, and an extension telephone slave is connected to the extension via the wireless access point. Then, the main unit that accommodates the extension line and the external line is allowed to manage the correspondence relationship between the extension telephone master unit and the extension telephone slave unit constituting the parent / slave telephone, and the connection destination of the voice path to the parent / slave telephone is set to the extension constituting the parent / slave telephone. Switch between the telephone base unit and the extension telephone handset. For this switching, there is a predetermined time difference between the extension telephone and the extension telephone slave unit. During this predetermined time difference, the voice data from the other party to the master / slave phone is transmitted to the master unit and the slave unit, and the voice from the master unit and the slave unit is transmitted. When data is received, it is mixed based on the correspondence between the parent and child telephones and transmitted to the other party.

For example, the present invention provides a main unit that accommodates external lines and internal lines, at least one extension telephone master unit connected to the extension, at least one extension telephone slave unit, and wireless access connected to the extension A parent-child phone system having a point,
The extension telephone cordless handset is
Connected to the extension via the wireless access point,
The main unit is
A parent-child relationship storage means for storing a correspondence relationship between the extension telephone master unit and the extension telephone slave unit constituting a parent-child phone;
Referring to the parent-child relationship storage means, a voice path switching means for switching the connection destination of the voice path to the parent-child phone between the extension telephone master unit and the extension telephone slave unit constituting the parent-child phone;
The other party that transmits voice data from the extension telephone master unit registered in the parent-child relationship storage means or the other party connected to the extension telephone slave unit to both the extension telephone master unit and the extension telephone slave unit Having voice data transmission means,
When a predetermined state change occurs in the extension telephone master unit or the extension telephone slave unit, or when a predetermined operation is performed, the voice path switching unit is notified of the extension telephone master. Voice data from the other party is sent to the extension telephone parent for a predetermined time before or after the switching is instructed, together with an instruction to switch the connection destination of the voice path to the parent telephone including the telephone or the extension telephone. Control means for transmitting to both the telephone and the extension telephone handset.

According to the present invention, when the main apparatus switches the voice path between the extension telephone master unit and the extension telephone slave unit constituting the parent / slave telephone, a predetermined time difference is provided in the switching timing, and the other party of the call is communicated only during this predetermined time. Is sent to the master unit and the slave unit, and when voice data is received from the master unit and the slave unit, it is mixed and transmitted to the other party based on the correspondence between the parent and slave phone units. It is possible to eliminate voice interruptions when continuing a call while switching.
Compared to the case where voice data from the other party is continuously transmitted to both the master unit and the slave unit during a call and the voice data from the master unit and the slave unit is mixed and transmitted to the other party. It is possible to significantly reduce the occupied bandwidth of the communication band between the network and the extension network.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic configuration diagram of a parent-child telephone system to which an embodiment of the present invention is applied.

  As shown in the figure, the parent-child telephone system according to the present embodiment includes a main apparatus 1 that accommodates an external network (for example, WAN) 5 and an internal network (for example, LAN) 4, and a wireless AP (access point) connected to the internal network 4. ) 3 and at least one set of parent-child phone 2.

  The parent / child phone 2 includes a parent device 21 and a child device 22 configured to be placed on the parent device 21. The base unit 21 is connected to the extension network 4. The subunit | mobile_unit 22 has a wireless communication function, and is connected to the extension network 4 via wireless AP3.

  The main device 1 manages the correspondence between the parent device 21 and the child device 22 constituting the parent-child phone 2. In addition, the main device 1 is connected to at least one of the master unit 21 and the slave unit 22 constituting the master-slave phone 2 when a predetermined state of the master unit 21 and the slave unit 22 constituting the master-slave phone 2 changes. When a predetermined operation is performed, the connection destination of the voice path (call path) to the parent / child phone 2 is switched between the parent device 21 and the child device 22 constituting the parent / child phone 2.

  Next, each device constituting the parent-child phone system of the present embodiment will be described.

  First, the main device 1 will be described. FIG. 2 is a schematic configuration diagram of the main device 1.

  As shown in the figure, the main apparatus 1 includes an external line IF unit 11, an internal line IF unit 12, a communication control unit 13, a GW unit 14, a router unit 15, a call control unit 16, a route switching unit 17, A parent-child information storage unit 18, an audio mixing unit 19, and a main control unit 20 are included.

  The external line IF unit 11 is an interface for connecting to the external network 5.

  The extension IF unit 12 is an interface for connecting to the extension network 4.

  The communication control unit 13 performs processing (error detection, error correction, packet analysis, etc.) necessary for transmitting / receiving communication packets to / from the external network 5 and the internal network 4.

  The GW unit 14 is a gateway that relays between the external network 5 and the internal network 4.

  The router unit 15 performs communication packet routing.

  The call control unit 16 performs call control processing according to a call control protocol such as SIP.

  The path switching unit 17 switches the connection destination of the voice path to the parent / child phone 2 between the parent device 21 and the child device 22 constituting the parent / child phone 2.

The parent-child information storage unit 18 stores information (parent-child information) related to the parent-child phone 2. FIG. 3 is a diagram schematically showing the parent-child information storage unit 18. As shown in the figure, a parent-child information record 180 is registered in the parent-child information storage unit 18 for each parent-child phone 2. The record 180 includes a field 181 for registering a telephone number assigned to the parent / child phone 2, a field 182 for registering identification information (parent device ID) of the parent device 21, and identification information (child device ID) of the child device 22. The field 183 to be registered, the field 184 for registering the state of the handset 22 (within or outside the wireless AP 3), and the state of placement of the handset 22 on the base unit 21 (placed or not placed) And a field 186 for registering the hook state (on-hook or off-hook) of the parent-child phone 2. Here, the mounted state means whether or not the child device 22 is mounted on the base of the parent device 21. The hook state refers to whether or not the parent / child phone 2 can process a call, that is, the on-hook state refers to a state where a call can be made / received, and the off-hook state refers to a state where a call cannot be received (such as busy). .

  The voice mixing unit 19 mixes voice data from the master unit 21 and the slave unit 22 received via the extension IF unit 12, the communication control unit 13, and the main control unit 20 from the master / slave telephone 2 of the extension network 4. To your phone. The voice data from the telephone of the other party on the extension network 4 or the external network 5 is copied and transmitted to the master unit 21 and the slave unit 22 of the master-slave phone 2, respectively.

  And the main control part 20 controls each part 11-19 of the main apparatus 1 centralizedly. Also, when switching voice paths, when a call switching request is received from the master unit 21 or the slave unit 22, the voice from the other party is transmitted to both the master unit 21 and the slave unit 22 for a predetermined time. Thereafter, the voice is transmitted only to the switching destination master unit 21 or the slave unit 21. Further, the audio data from the parent device 21 and the child device 22 may be passed to the audio mixing unit only during a predetermined time.

  FIG. 4 is a flowchart for explaining the operation of the main apparatus 1.

  When the main control unit 20 receives call data from the external line network 5 via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 (YES in S11), the main control unit 20 receives the call data as a call control unit. 16 In response to this, the call control unit 16 performs incoming processing described later in cooperation with the main control unit 20 (S12).

  When the main control unit 20 receives control data indicating that the call button is “ON” from the extension network 4 via the extension IF unit 12 and the communication control unit 13 (YES in S13), this control is performed. Data is passed to the call control unit 16. In response to this, the call control unit 16 performs a calling process described later in cooperation with the main control unit 20 (S14).

  Further, when receiving the management data from the extension network 4 via the extension IF unit 12 and the communication control unit 13 (YES in S15), the main control unit 20 updates the parent-child information storage unit 18 using this management data. (S16).

  Specifically, when management data including a telephone number and a handset status is received, the record 180 is searched from the parent-child information storage unit 18 using the telephone number included in the management data as a key. Then, the slave unit status included in the retrieved record 180 is updated to the slave unit status included in the management data. When management data including a telephone number and a placement state is received, the record 180 is retrieved from the parent-child information storage unit 18 using the telephone number included in the management data as a key. Then, the placement state included in the retrieved record 180 is updated to the placement state included in the management data.

  FIG. 5 is a flowchart for explaining the incoming call processing (S12 in FIG. 4) of the main apparatus 1.

  First, the call control unit 16 confirms the parent-child information of the parent-child phone 2 that is the destination of the call data in cooperation with the main control unit 20 (S121).

  Specifically, the main control unit 20 retrieves the record 180 from the parent-child information storage unit 18 using the call data arrival number as a key. Then, the call control unit 16 is notified of the parent device ID, child device ID, child device state, placement state, and hook state registered in the fields 182 to 186 of the retrieved record 180.

  When the hook state is “off hook” (“off” in S122), the call control unit 16 passes through the GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 to the call data transmission source. Busy processing such as sending a busy tone is performed (S123).

  Further, when the hook state is “on hook” (“ON” in S122) and the placement state indicates that the slave unit 22 is mounted on the master unit 21 (“placement” in S124), The call control unit 16 performs a base unit incoming call process (S126).

  Further, the hook state is “on hook” (“on” in S122), and the placement state indicates that the slave unit 22 is not mounted on the master unit 21 (“not placed” in S124), and Even when the handset state is out of the range of the wireless AP 3 (“out of range” in S125), the call control unit 16 performs a base unit incoming call process to be described later (S126).

  Further, the hook state is on-hook (“ON” in S122), and the placement state indicates that the slave unit 22 is not mounted on the master unit 21 (“not placed” in S124), and the slave unit When the state is within the range of the wireless AP 3 (“range” in S125), the call control unit 16 performs a slave unit incoming call process to be described later (S127).

  FIG. 6 is a flowchart for explaining the base unit incoming processing (S126 in FIG. 5) of main apparatus 1.

  First, the call control unit 16 sends an incoming call notification to the base unit 21 specified by the base unit ID confirmed in S121 of FIG. 5 via the communication control unit 13 and the extension IF unit 12 (S12601). Then, the call control unit 16 receives ACK data for the incoming call notification from the parent device 21 via the extension IF unit 12 and the communication control unit 13. Then, the ACK data is transferred to the call data transmission source via the GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 (S12602). Further, the main control unit 20 is requested to set the voice path to the master unit 21. In response to this, the main control unit 20 controls the path switching unit 17 to establish a voice path between the call data transmission source and the base unit 21 identified by the base unit ID confirmed in S121 of FIG. It sets (S12603).

  Next, the call control unit 16 receives the ring tone data from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14. The incoming call display data for displaying the information is transferred to the base unit 21 specified by the base unit ID confirmed in S121 of FIG. 5 via the communication control unit 13 and the extension IF unit 12 (S12604). . In this embodiment, the case where the ring tone data is received from the call data transmission source has been described. However, the main apparatus 1 has the ring tone data, and a specific control command is received from the call data transmission source. When transmitted, the main device 1 may transmit ringtone data.

  When the handset status is out of service area (YES in S12605), the call control unit 16 sets the call button (hands free button) from the base unit 21 to “ON” via the extension IF unit 12 and the communication control unit 13. If the control data indicating that the connection has been received (YES in S12606), a connection response is sent to the call data transmission source via the GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11. Data is transmitted (S12607).

  Thereby, the path switching unit 17 transmits the voice data received from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 to the communication control unit 13 and the extension line. The data is transferred to the parent device 21 specified by the parent device ID confirmed in S121 of FIG. In addition, the voice data received from the base unit 21 specified by the base unit ID confirmed in S121 of FIG. 5 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 to the call data transmission source.

  Then, the call control unit 16 updates the parent-child information of the parent-child phone 2 in cooperation with the main control unit 20 (S12608). Specifically, the main control unit 20 updates the hook state registered in the field 186 of the record 180 searched in S121 of FIG. 5 from “on hook” to “off hook”.

  On the other hand, when the handset status is within range (NO in S12605), the main control unit 20 receives a call button (hands-free button) from the base unit 21 via the extension IF unit 12 and the communication control unit 13. If control data indicating “ON” is received (YES in S12609), the processing of S12607 to S12608 is executed as in the case where the slave unit state is out of range. Also, the main control unit 20 does not receive control data indicating that the call button is “ON”, and receives the call data incoming number from the extension network 4 via the extension IF unit 12 and the communication control unit 13. If the management data including the placement state “non-placement” is received (YES in S12610), the placement state registered in the field 185 of the record 180 searched in S121 of FIG. To “Non-placed”.

  Then, the main control unit 20 controls the route switching unit 17 to set a voice route between the call data transmission source and the child device 22 identified by the child device ID confirmed in S121 of FIG. (S12611). As a result, the voice mixing unit 17 transmits the ring tone data received from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14, and the communication control unit 13 The data is transferred to the parent device 21 and the child device 22 identified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12. Also, the audio data received from the parent device 21 and the child device 22 identified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12 and the communication control unit 13 is mixed according to the setting of the parent-child information. The GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 are transferred to the call data transmission source. The call control unit 16 sends connection response data to the call data transmission source via the GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 (S12613).

  After that, if a predetermined time has elapsed (S12614), the main control unit 20 controls the path switching unit 17, and is identified by the call data transmission source and the parent device ID confirmed in S121 of FIG. 21 cancels the voice path set with the terminal 21 (S12615). As a result, the voice mixing unit 17 transmits the voice data received from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 to the communication control unit 13 and the extension line. The data is transferred to only the child device 22 specified from the parent-child information in the parent-child information storage unit 18 via the IF unit 12. Further, only the voice data received from the slave unit 22 specified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 to the call data transmission source. (S12616).

  Then, the call control unit 16 updates the parent-child information of the parent-child phone 2 in cooperation with the main control unit 20 (S12617). Specifically, the main control unit 20 updates the hook state registered in the field 186 of the record 180 searched in S121 of FIG. 5 from “on hook” to “off hook”.

  FIG. 7 is a flowchart for explaining the slave unit incoming processing (S127 in FIG. 5) of the main apparatus 1.

  First, the call control unit 16 sends an incoming call notification to the slave unit 22 specified by the slave unit ID confirmed in S121 of FIG. 5 via the communication control unit 13 and the extension IF unit 12 (S12701). Then, the call control unit 16 receives ACK data for the incoming call notification from the handset 22 via the extension IF unit 12 and the communication control unit 13. Then, the ACK data is transferred to the call data transmission source via the GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 (S12702). Further, it requests the main control unit 20 to set the voice path to the slave unit 22. In response to this, the main control unit 20 controls the path switching unit 17 to establish a voice path between the call data transmission source and the handset 22 identified by the handset ID confirmed in S121 of FIG. Setting is made (S12703).

  Next, the call control unit 16 receives the ring tone data from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14. It transfers to the subunit | mobile_unit 22 identified by the subunit | mobile_unit ID confirmed by S121 of FIG. 5 via the communication control part 13 and the extension IF part 12 (S12704). Also, incoming call display data for displaying that the incoming call has been received is sent to the parent device 21 specified by the parent device ID confirmed in S121 of FIG. 5 via the communication control unit 13 and the extension IF unit 12.

  Although not described in the present embodiment, for example, when the handset 22 has a display function such as an LCD, incoming display data is sent via the communication control unit 13 and the extension IF unit 12 in S121 of FIG. You may transfer to the subunit | mobile_unit 22 identified by confirmed subunit | mobile_unit ID, or both this subunit | mobile_unit 22 and the main | base station 21. FIG.

  Further, the ring tone data is transmitted to the base unit 21 specified by the base unit ID confirmed in S121 of FIG. 5 via the communication control unit 13 and the extension IF unit 12, or both the base unit 21 and the handset unit 22. May be sent to

  The call control unit 16 receives control data indicating that the call button is turned “ON” from the handset 22 via the extension IF unit 12 and the communication control unit 13 during transfer of the ring tone data. If so (YES in S12705), connection response data is sent to the call data transmission source via the GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 (S12706).

  Thereby, the path switching unit 17 transmits the voice data received from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 to the communication control unit 13 and the extension line. The data is transferred to the handset 22 identified by the handset ID confirmed in S121 of FIG. Also, the voice data received from the slave unit 22 identified by the slave unit ID confirmed in S121 of FIG. 5 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 to the call data transmission source.

  Then, the call control unit 16 updates the parent-child information of the parent-child phone 2 in cooperation with the main control unit 20 (S12707). Specifically, the main control unit 20 updates the hook state registered in the field 186 of the record 180 searched in S121 of FIG. 5 from “on hook” to “off hook”.

  The main control unit 20 also receives the call data arrival number and placement from the extension network 4 via the extension IF unit 12, the communication control unit 13, the router unit 15 and the GW unit 14 during the transfer of the ring tone data. When the management data including the state “placement” is received (YES in S12708), the placement state registered in the field 185 of the record 180 searched in S121 of FIG. 5 is changed from “non-placement” to “placement”. Update to Then, the main control unit 20 controls the route switching unit 17 to set a voice route between the call data transmission source and the parent device 21 specified by the parent device ID confirmed in S121 of FIG. (S12709). As a result, the voice mixing unit 17 transmits the ring tone data received from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14, and the communication control unit 13 The data is transferred to the parent device 21 and the child device 22 identified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12. Also, the audio data received from the parent device 21 and the child device 22 identified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12 and the communication control unit 13 is mixed according to the setting of the parent-child information. The GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 are transferred to the call data transmission source.

  After that, if a predetermined time has elapsed (S12711), the main control unit 20 controls the path switching unit 17 to specify the call data transmission source and the child device ID confirmed in S121 of FIG. The voice path set between the terminal 22 and the terminal 22 is canceled (S12713). As a result, the voice mixing unit 17 transmits the voice data received from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 to the communication control unit 13 and the extension line. Only the parent device 21 specified from the parent-child information in the parent-child information storage unit 18 is transferred via the IF unit 12. Further, only the voice data received from the parent device 21 specified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 are transferred to the call data transmission source (S12713).

  When the call control unit 16 receives control data indicating that the call button is turned “ON” from the base unit 22, the GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit. 11, connection response data is sent to the call data transmission source (S12714).

  Then, the call control unit 16 updates the parent-child information of the parent-child phone 2 in cooperation with the main control unit 20 (S12715). Specifically, the main control unit 20 updates the hook state registered in the field 186 of the record 180 searched in S121 of FIG. 5 from “on hook” to “off hook”.

  FIG. 8 is a flowchart for explaining the transmission process (S14 in FIG. 4) of the main apparatus 1.

  First, the call control unit 16 confirms the parent-child information of the parent-child phone 2 that is the transmission source of the control data in cooperation with the main control unit 20 (S141). Specifically, the main control unit 20 searches the record 180 from the parent-child information storage unit 18 using the ID (parent device ID or child device ID) of the control data transmission source (parent device 21 or child device 22) as a key. To do. Then, the call control unit 16 is notified of the telephone number, the parent device ID, the child device ID, the child device state, the placement state, and the hook state registered in the fields 181 to 186 of the retrieved record 180.

  When the hook state is “off hook” (“off” in S142), the call control unit 16 is busy in transmitting a busy tone to the control data transmission source via the communication control unit 13 and the extension IF unit 12. Processing is performed (S143).

  On the other hand, when the hook state is “on hook” (“ON” in S142), the call control unit 16 receives the destination from the parent / child phone 2 that is the transmission source of the control data via the communication control unit 13 and the extension IF unit 12. Is received (S144). Here, the call control unit 16 uses the parent device 21 specified by the parent device ID registered in the field 182 of the record 180 searched in S141 and the child device ID registered in the field 183 of the record 180. The destination telephone number is received by accumulating dial information received in order from either one or both of the specified slave units 22.

  Next, the call control unit 16 generates call data with the destination telephone number and sends it to the external line network 5 via the GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 ( S145).

  In the call control unit 16, the control data of the parent / child phone 2 received in S13 of FIG. 4 is control data transmitted from the parent device 21 and indicating that the call button of the parent device 21 is “ON”. In the case (“master” in S146), the master-device transmission process described later is performed (S147). On the other hand, when this control data is control data sent from the child device 22 and indicating that the call button of the child device 22 is “ON” (“child device” in S146), a child device transmission process to be described later Is performed (S148).

  FIG. 9 is a flowchart for explaining the base unit transmission process (S147 in FIG. 8) of main apparatus 1.

  First, the call control unit 16 updates the parent-child information of the parent-child phone 2 in cooperation with the main control unit 20 (S14701). Specifically, the main control unit 20 updates the hook state registered in the field 186 of the record 180 searched in S141 of FIG. 8 from “on hook” to “off hook”.

  Next, the call control unit 16 requests the main control unit 20 to set a voice path to the master unit 21. In response to this, the main control unit 20 controls the path switching unit 17 to set a voice path between the external network 5 and the base unit 21 specified by the base unit ID confirmed in S141 of FIG. (S14702). Then, the call control unit 16 transfers the ringing tone data received from the external line network 5 via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 to the parent device 21 (S14703). .

  When the call control unit 16 receives connection response data from the destination of the call data via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 (YES in S14704), A call is started between the data destination and the parent device 21 identified by the parent device ID confirmed in S141 of FIG. 8 (S14705).

  That is, the path switching unit 17 transmits the voice data received from the call data transmission source via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14, to the communication control unit 13 and the extension IF. The data is transferred to the parent device 21 specified by the parent device ID confirmed in S141 of FIG. In addition, the voice data received from the base unit 21 specified by the base unit ID confirmed in S141 in FIG. 8 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 to the destination of the call data.

  When the main control unit 20 receives the management data including the telephone number and the mounting state “non-placed” confirmed in S141 of FIG. 8 from the extension network 4 via the extension IF unit 12 and the communication control unit 13. (YES in S14706), the placement status registered in the field 185 of the record 180 searched in S141 of FIG. 8 is updated from “placement” to “non-placement”. Then, the main control unit 20 controls the route switching unit 17 to set a voice route between the call data transmission destination and the child device 22 identified by the child device ID confirmed in S141 of FIG. (S14707). Thus, the voice mixing unit 17 transmits the ringing tone data received from the call data transmission destination via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14, to the communication control unit 13, and The data is transferred to the parent device 21 and the child device 22 identified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12. Also, the audio data received from the parent device 21 and the child device 22 identified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12 and the communication control unit 13 is mixed according to the setting of the parent-child information. , The GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 to transfer to the call data transmission destination.

  After that, if a predetermined time has elapsed (S14709), the main control unit 20 controls the path switching unit 17, and the master unit specified by the call data transmission destination and the master unit ID confirmed in S141 of FIG. 21 cancels the voice path set up with the terminal 21 (S14710). Thus, the voice mixing unit 17 transmits the ringing tone data received from the call data transmission destination via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14, to the communication control unit 13, and The data is transferred only to the slave unit 22 specified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12. Further, only the voice data received from the slave unit 22 specified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 are transferred to the destination of call data (S14711).

  Thereafter, when the call control unit 16 receives the connection response data from the destination of the call data via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 (YES in S14712), A call is started between the destination of the call data and the handset 22 identified by the handset ID confirmed in S141 of FIG. 8 (S14705).

  FIG. 10 is a flowchart for explaining the slave unit transmission process (S148 in FIG. 8) of the main apparatus 1.

  First, the call control unit 16 updates the parent-child information of the parent-child phone 2 in cooperation with the main control unit 20 (S14801). Specifically, the main control unit 20 updates the hook state registered in the field 186 of the record 180 searched in S141 of FIG. 8 from “on hook” to “off hook”.

  Next, the call control unit 16 requests the main control unit 20 to set a voice path to the slave unit 22. In response to this, the main control unit 20 controls the path switching unit 17 to set a voice path between the external network 5 and the slave unit 22 identified by the slave unit ID confirmed in S141 of FIG. (S14802). Then, the call control unit 16 transfers the ringing tone data received from the external line network 5 via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 to the handset 22 (S14803). .

  When the call control unit 16 receives connection response data from the call data transmission destination via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 (YES in S14804), A call is started between the destination of the call data and the handset 22 identified by the handset ID confirmed in S141 of FIG. 8 (S14805).

  That is, the path switching unit 17 transmits the voice data received from the call data transmission destination via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 to the GW unit 14, the router unit 15, The data is transferred to the handset 22 identified by the handset ID confirmed in S141 of FIG. 8 via the communication control unit 13 and the extension IF unit 12. Also, the voice data received from the slave unit 22 identified by the slave unit ID confirmed in S141 of FIG. 8 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 to the call data transmission destination.

  In addition, the main control unit 20 receives the telephone number and placement status “placement” confirmed in S141 of FIG. 8 from the extension network 4 via the extension IF unit 12, the communication control unit 13, the router unit 15, and the GW unit 14. Is received (YES in S14806), the placement status registered in the field 185 of the record 180 searched in S141 in FIG. 8 is updated from “non-placement” to “placement”. Then, the main control unit 20 controls the route switching unit 17 to set a voice route between the call data transmission destination and the parent device 21 specified by the parent device ID confirmed in S141 of FIG. (S14807). Thus, the voice mixing unit 17 transmits the ringing tone data received from the call data transmission destination via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14, to the communication control unit 13, and The data is transferred to the parent device 21 and the child device 22 identified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12. Also, the audio data received from the parent device 21 and the child device 22 identified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12 and the communication control unit 13 is mixed according to the setting of the parent-child information. , The GW unit 14, the router unit 15, the communication control unit 13, and the external line IF unit 11 to transfer to the call data transmission destination.

  After that, if a predetermined time has passed (S14809), the main control unit 20 controls the path switching unit 17, and specifies the call data transmission destination and the slave unit identified by the slave unit ID confirmed in S141 of FIG. The voice path set between the terminal 22 and the terminal 22 is canceled (S14810). Thus, the voice mixing unit 17 transmits the ringing tone data received from the call data transmission destination via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14, to the communication control unit 13, and The data is transferred only to the parent device 21 specified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12. Further, only the voice data received from the parent device 21 specified from the parent-child information in the parent-child information storage unit 18 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 are transferred to the destination of call data (S14711).

  Thereafter, when the call control unit 16 receives the connection response data from the destination of the call data via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 (YES in S14812), A call is started between the call data transmission destination and the parent device 21 specified by the parent device ID confirmed in S141 of FIG. 8 (S14805).

  That is, the path switching unit 17 transmits the voice data received from the call data transmission destination via the external line IF unit 11, the communication control unit 13, the router unit 15, and the GW unit 14 to the GW unit 14, the router unit 15, The data is transferred to the parent device 21 specified by the parent device ID confirmed in S141 in FIG. 8 via the communication control unit 13 and the extension IF unit 12. In addition, the voice data received from the base unit 21 specified by the base unit ID confirmed in S141 in FIG. 8 via the extension IF unit 12 and the communication control unit 13 is transmitted to the GW unit 14, the router unit 15, and the communication control unit. 13 and the external line IF unit 11 to the destination of the call data.

  Next, the wireless AP 3 will be described. FIG. 11 is a schematic configuration diagram of the wireless AP 3.

  As shown in the figure, the wireless AP 3 includes a wireless IF unit 31, an extension IF unit 32, a communication control unit 33, a child device management unit 34, a child device information storage unit 35, and a main control unit 36. .

  The wireless IF unit 31 is an interface for connecting to a wireless network.

  The extension IF unit 32 is an interface for connecting to the extension network 4.

  The communication control unit 33 performs processing (error detection, error correction, packet analysis, etc.) necessary for transmitting and receiving communication packets to and from the wireless network and the extension network 4.

  The handset management unit 34 manages the handset 22 within the range of the own wireless AP 3. Specifically, a slave unit of this slave unit 22 that broadcasts a beacon (management data) to the wireless network via the communication control unit 33 and the wireless IF unit 31 and transmits by the slave unit 22 that has received this beacon. Management data including an ID and a telephone number is received via the wireless IF unit 31 and the communication control unit 33. Then, the slave unit ID and the telephone number included in the received management data are registered in the slave unit information storage unit 35 as the slave unit ID and the telephone number of the slave unit 22 within the range of the own wireless AP 3. Further, the slave unit ID and the telephone number that are not included in the received management data are deleted from the slave unit information storage unit 35 as the slave unit ID and the telephone number of the slave unit 22 that is out of the range of the own wireless AP 3.

  The main control unit 36 comprehensively controls each unit 31 to 35 of the wireless AP 3. Specifically, in cooperation with the wireless IF unit 31, the extension IF unit 32, and the communication control unit 33, relaying is performed between the wireless network and the extension network 4. Further, in cooperation with the slave unit management unit 34, the slave unit ID and the telephone number of the slave unit 22 within the range of the own wireless AP 3 are registered in the slave unit information storage unit 35, and the child that is out of the range of the own wireless AP 3 is registered. The slave unit ID and the telephone number of the unit 22 are deleted from the slave unit information storage unit 35.

  Further, the main control unit 36 generates management data including a telephone number newly registered in the handset information storage section 35 and a handset status indicating that the handset 22 having this telephone number is within range. The management data is sent to the main apparatus 1 via the communication control unit 33 and the extension IF unit 32. Similarly, the management data including the telephone number deleted from the handset information storage unit 35 and the handset status indicating that the handset 22 having this telephone number is out of service is generated, and the communication control unit 33, This management data is sent to the main apparatus 1 via the extension IF unit 32.

  Next, the master unit 21 will be described. FIG. 12 is a schematic configuration diagram of the parent device 21.

  As shown in the figure, the base unit 21 includes an extension IF unit 2101, a communication control unit 2102, a call control unit 2103, input keys such as a call button (hands-free button), dial keys, function keys, and an LCD display. An operation panel 2104 provided with a unit, an operation control unit 2105, a hands-free unit 2106 provided with a microphone and a speaker, an audio control unit 2107, a slave unit IF unit 2108, a power supply control unit 2109, and a main control unit 2110 And having.

The extension IF unit 2101 is an interface for connecting to the extension network 4.

  The communication control unit 2102 performs processing (error detection, error correction, packet analysis, etc.) necessary for sending and receiving communication packets with the extension network 4.

  The call control unit 2103 performs call control processing according to a call control protocol such as SIP.

  The operation control 2105 receives user operations and displays information via the operation panel 2104.

  The voice control unit 2107 controls voice input / output with respect to the handsfree unit 2106.

  The slave unit IF unit 2108 is an interface for connecting to the slave unit 22 when the slave unit 22 is placed on the host unit 21. The slave unit IF unit 2108 includes a power supply terminal for charging the slave unit 22, a communication terminal for acquiring the slave unit ID from the slave unit 22, and a center for detecting the placement state of the slave unit 22. Have.

  The power control unit 2109 controls charging of the slave unit 22 connected to the slave unit IF unit 2108. Further, the mounting state of the slave unit 22 is detected using a sensor provided in the slave unit IF unit 2108. Furthermore, the power control unit 2109 acquires the slave unit ID of the slave unit 22 connected to the slave unit IF unit 2108.

  The main control unit 2110 comprehensively controls each unit 2101 to 2109 of the parent device 21.

  FIG. 13 is a flowchart for explaining the operation of base unit 21.

  When the main control unit 2110 receives an incoming call notification from the main apparatus 1 via the extension IF unit 2101 and the communication control unit 2102 (YES in S211), the main control unit 2110 passes the incoming call notification to the call control unit 2103. In response to this, the call control unit 2103 performs incoming call processing described later in cooperation with the main control unit 2110 (S212).

  When the main control unit 2110 detects that the call button is “ON” via the operation panel 2104 and the operation control unit 2105 (YES in S213), the main control unit 2110 passes a call instruction to the call control unit 2103. In response to this, the call control unit 2103 performs call processing described later in cooperation with the main control unit 2110 (S214).

  When the main control unit 2110 detects that the placement state of the slave unit 22 has changed via the slave unit IF unit 2108 and the power source control unit 2109 (YES in S215), the main control unit 2110 performs the next management data transmission process. This is performed (S216).

  That is, when the placement state of the slave unit 22 changes from “not placed” to “placed”, the main control unit 2110 acquires the slave unit ID from the slave unit 22 via the power supply control unit 2109. Then, it is checked whether or not this child device ID matches that registered in advance as the child device ID of the child device 22 having a parent-child relationship with the own parent device 21. If they match, it is determined that the child device 22 having a parent-child relationship with the parent device 21 is placed, and management data including the telephone number of the parent device 2 and the placement state “placement” is generated. Then, the management data is transmitted to the main apparatus 1 via the communication control unit 2102 and the extension IF unit 2101. Further, when the placement state of the handset 22 changes from “placed” to “non-placed”, the handset 22 that has been placed on the base unit 21 until just before is in a parent-child relationship with the base unit 21. If it is a certain handset 22, the management data including the telephone number of the self-parent phone 2 and the placement state “non-placement” is generated. Then, the management data is transmitted to the main apparatus 1 via the communication control unit 2102 and the extension IF unit 2101.

FIG. 14 is a flowchart for explaining the incoming call process (S212 in FIG. 13) of base unit 21.

  First, the call control unit 2103 sends ACK data for an incoming call notification to the main apparatus 1 via the communication control unit 2102 and the extension IF unit 2101 (S22101).

  Next, the call control unit 2103 inquires of the main control unit 2110 about the placement state of the slave unit 22. In response to this, the main control unit 2110 controls the power supply control unit 2109 to check the placement state of the slave unit 22. If the child device 22 is placed on the parent device 21, the child device ID is acquired from the child device 22, and the child device ID of the child device 22 in which the child device ID has a parent-child relationship with the parent device 21. It is checked whether or not it matches with that registered in advance. If they match, the call control unit 2103 is notified of the placement state “placement”. On the other hand, if they do not match, or if the handset 22 is not placed on the base unit 21, the placement control unit 2103 is notified of the placement state “not placed”.

  When the placement state of the slave unit 22 is “placement” (“placement” in S21202), the call control unit 2103 proceeds to S21203. On the other hand, if the placement state of the slave unit 22 is “not placed” (“not placed” in S21202), the process proceeds to S21212.

  In step S <b> 2203, the call control unit 2103 waits for a notification for setting a voice path with the call control data transmission source from the main apparatus 1 via the extension IF unit 2101 and the communication control unit 2102. Based on the voice route setting notification, the voice control unit 2107 controls voice input / output with respect to the hands-free unit 2106.

  Next, the call control unit 2103 waits for incoming call tone data and incoming call display data from the main apparatus 1 via the extension IF unit 2101 and the communication control unit 2102. Then, based on the ring tone data and the incoming call display data, ringing is controlled using a sound source (not shown) or the like (S21204). Then, the call control unit 2103 waits for the call button to be “ON” or for the placement state of the handset 22 to change from “placed” to “not placed”.

  When the main control unit 2110 detects that the call button on the operation panel 2104 is “ON” via the operation control unit 2105 (YES in S21205), the main control unit 2110 notifies the call control unit 2103 of the call button “ON”. . In response to this, the call control unit 2103 sends control data indicating that the base unit ID of the base unit 21 and the call button are “ON” via the communication control unit 2102 and the extension IF unit 2101. The data is sent to the device 1 (S21206).

  Then, the call control unit 2103 stops ringing and starts a voice call (S21207). As a result, the call packet sent from the main apparatus 1 is received by the extension IF unit 2101, and voice data is extracted by the communication control unit 2102. The audio data is output from the speaker of the hands-free unit 2106 by the audio control unit 2107. The voice input to the microphone of the hands-free unit 2106 is converted into voice data by the voice control unit 2107. Then, the voice data is stored in a call packet by the communication control unit 2102 and sent from the extension IF unit 2101 to the main apparatus 1.

  In addition, the main control unit 2110 confirms that the slave unit 22 that has been placed in the master unit 21 and has a parent-child relationship with the master unit 21 has become “not placed” via the power source control unit 2109. Is detected (YES in step S21208), the call control unit 2103 is notified of the placement state “non-placement”. In response to this, the call control unit 2103 sends management data including the telephone number of the parent / child phone 2 and the placement status “non-placed” to the main apparatus 1 via the communication control unit 2102 and the extension IF unit 2101. It is sent out (S21209).

  Then, the main device 1 receives a notification that the voice path setting with the base unit 21 has been canceled via the extension IF unit 2101 and the communication control unit 2102 (S21210), and the call control unit 2103 receives the incoming call. The ringing is stopped (S21211).

  On the other hand, when the placement state of the slave unit 22 is “non-placement” (“non-placement” in S21202), the call control unit 2103 is connected to the main device 1 via the extension IF unit 2101 and the communication control unit 2102. Wait for incoming display data to be sent. Based on the incoming call display data, the incoming call display data is displayed on the display unit of the operation panel 2104 via the operation control unit 2105 (S21212).

  Next, when the main control unit 2110 detects that the child device 22 having a parent-child relationship with the own parent device 21 is placed on the own parent device 21 via the power supply control unit 2109 (YES in step S21213). The call control unit 2103 is notified of the placement state “placement”. In response to this, the call control unit 2103 sends management data including the telephone number of the parent-child phone 2 and the placement status “placement” to the main apparatus 1 via the communication control unit 2102 and the extension IF unit 2101. (S21214).

  Here, when the self-parent / child phone 2 (specifically, the child device 22) is busy, the main apparatus 1 transmits a voice path setting notification to the parent device 21. When the call control unit 2103 receives this voice path setting notification from the main apparatus 1 via the extension IF unit 2101 and the communication control unit 2102, the call control unit 2103 starts a voice call (S21213).

  As a result, the call packet sent from the main apparatus 1 is received by the extension IF unit 2101, and voice data is extracted by the communication control unit 2102. The audio data is output from the speaker of the hands-free unit 2106 by the audio control unit 2107. The voice input to the microphone of the handsfree unit 2106 is converted into voice data by the voice control unit 2107. Then, the voice data is stored in a call packet by the communication control unit 2102 and sent from the extension IF unit 2101 to the main apparatus 1.

  FIG. 15 is a flowchart for explaining the calling process (S214 in FIG. 13) of base unit 21.

  First, the call control unit 2103 sends control data indicating that the base unit ID of the base unit 21 and the call button are “ON” to the main apparatus 1 via the communication control unit 2102 and the extension IF unit 2101. It is sent out (S21401).

  Next, the call control unit 2103 accepts the telephone number of the call partner input to the dial key of the operation panel 2104 via the operation control unit 2105, and receives the telephone number of the other party from the communication control unit 2102 and the extension IF unit 2101. 1, this telephone number is transmitted (S21402). Then, main apparatus 1 transmits a voice path setting notification to base unit 21. When the call control unit 2103 receives the voice path setting notification from the main apparatus 1 via the extension IF unit 2101 and the communication control unit 2102 (S21403), the call control unit 2103 passes the extension IF unit 2101 and the communication control unit 2102. The ringing tone data received from the main device 1 is output from the speaker of the handsfree unit 2106 via the voice control unit 2107 (S21404).

  The main control unit 2110 confirms that the slave unit 22 that is placed on the master unit 21 and has a parent-child relationship with the master unit 21 has become “not placed” via the power source control unit 2109. Is detected (YES in S21405), the placement control unit 2103 is notified of the placement state “non-placement”. In response to this, the call control unit 2103 sends management data including the telephone number of the parent / child phone 2 and the placement status “non-placed” to the main apparatus 1 via the communication control unit 2102 and the extension IF unit 2101. It is sent out (S21406).

  Then, the call control unit 2103 receives a notification for canceling the setting of the voice path for the base unit 21 from the main apparatus 1 via the extension IF unit 2101 and the communication control unit 2102 (S21407), and outputs a ringing tone. Is stopped (S21408).

  Further, the main control unit 2110, when the slave unit 22 placed in the master unit 21 and in a parent-child relationship with the master unit 21 is in the “placed” state (NO in S21405), the extension IF When a connection response is received from the main apparatus 1 via the unit 2101 and the communication control unit 2102 (S21409), this is notified to the call control unit 2103. In response to this, the call control unit 2103 starts a call (S21410).

  As a result, the call packet sent from the main apparatus 1 is received by the extension IF unit 2101, and voice data is extracted by the communication control unit 2102. The audio data is output from the speaker of the hands-free unit 2106 by the audio control unit 2107. The voice input to the microphone of the handsfree unit 2106 is converted into voice data by the voice control unit 2107. Then, the voice data is stored in a call packet by the communication control unit 2102 and sent from the extension IF unit 2101 to the main apparatus 1.

  Next, the slave unit 22 will be described. FIG. 16 is a schematic configuration diagram of the slave unit 22.

  As shown in the figure, the handset 22 includes an operation unit including a wireless IF unit 2201, a communication control unit 2202, a call control unit 2203, input keys such as a call button, dial keys, and function keys, and a display unit such as an LCD. A panel 2204, an operation control unit 2205, a handset unit 2206 provided with a microphone and a speaker, a voice control unit 2207, a parent device IF unit 2208, a power supply control unit 2209, and a main control unit 2210 are provided.

  The wireless IF unit 2201 is an interface for connecting to a wireless network.

  The communication control unit 2202 performs processing (error detection, error correction, packet analysis, etc.) necessary for transmitting and receiving communication packets to and from the wireless network.

  The call control unit 2203 performs call control processing according to a call control protocol such as SIP.

  The operation control 2205 accepts user operations and displays information via the operation panel 2204.

  The voice control unit 2207 controls voice input / output with respect to the handset unit 2206.

  The base unit IF unit 2208 is an interface for connecting to the base unit 21 when the local unit 22 is placed on the base unit 21. The base unit IF unit 2208 has a power input terminal for inputting power from the base unit 21 and a communication terminal for notifying the base unit 21 of the slave unit ID of the local unit 22.

  The power control unit 2209 controls the storage of electric power provided from the parent device 21 connected to the parent device IF unit 2208. In addition, the base unit 21 connected to the base unit IF unit 2208 is notified of the base unit ID of the base unit 22.

  And the main control part 2210 controls each part 2201-2209 of the subunit | mobile_unit 22 collectively.

  FIG. 17 is a flowchart for explaining the operation of the slave unit 22.

  When the main control unit 2210 receives an incoming call notification from the main apparatus 1 via the wireless IF unit 2201 and the communication control unit 2202 (YES in S221), it passes the incoming call notification to the call control unit 2203. In response to this, the call control unit 2203 performs incoming processing described later in cooperation with the main control unit 2210 (S222).

  When the main control unit 2210 detects that the call button is “ON” via the operation panel 2204 and the operation control unit 2205 (YES in S223), the main control unit 2210 passes a call instruction to the call control unit 2203. In response to this, the call control unit 2203 performs outgoing processing described later in cooperation with the main control unit 2210 (S224).

  When the main control unit 2110 receives an ID request from the master unit 21 on which the slave unit 22 is placed via the master unit IF unit 2208 and the power source control unit 2209 (YES in S225), The child device ID registered in advance is transmitted to the device 21 via the parent device IF unit 2208 (S226).

  FIG. 18 is a flowchart for explaining the incoming call processing (S222 in FIG. 17) of the handset 22.

  First, the call control unit 2203 sends ACK data for the incoming call notification to the main apparatus 1 via the communication control unit 2202 and the wireless IF unit 2201 (S22201).

  In step S22202, the call control unit 2203 waits for a notification for setting a voice path to the call control data transmission source from the main apparatus 1 via the wireless IF unit 2201 and the communication control unit 2202. Based on the voice path setting notification, the voice control unit 2207 controls voice input / output with respect to the handset unit 2206.

  Next, the call control unit 2203 waits for incoming ring tone data to be sent from the main apparatus 1 via the wireless IF unit 2201 and the communication control unit 2202. Then, based on the ring tone data, ringing is controlled using a sound source (not shown) (S22203). Then, the call control unit 2203 notifies that the call button is turned “ON” or cancels the setting of the voice path for the child device 22 from the main apparatus 1 via the wireless IF unit 2201 and the communication control unit 2202. Wait for you to be sent.

  When the main control unit 2210 detects that the call button on the operation panel 2204 is “ON” via the operation control unit 2205 (YES in S22204), the main control unit 2210 notifies the call control unit 2203 of the call button “ON”. . In response to this, the call control unit 2203 sends control data indicating that the handset ID and the call button of the handset 22 are turned “ON” via the communication control unit 2202 and the wireless IF unit 2201. The data is sent to the device 1 (S22205).

  Then, the call control unit 2203 stops ringing and starts a voice call (S22206). As a result, the call packet sent from the main apparatus 1 is received by the wireless IF unit 2201, and voice data is extracted by the communication control unit 2202. Then, this audio data is output from the speaker of the handset unit 2206 by the audio control unit 2207. In addition, the voice input to the microphone of the handset unit 2206 is converted into voice data by the voice control unit 2207. The voice data is stored in the call packet by the communication control unit 2202 and transmitted from the wireless IF unit 2201 to the main apparatus 1.

  When the main control unit 2210 receives a notification from the main apparatus 1 via the wireless IF unit 2201 and the communication control unit 2202 for canceling the setting of the audio path for the slave unit 22 (YES in S22207), the audio path Notification of cancellation is sent to the call control unit 2203. In response, the call control unit 2203 stops ringing for incoming calls (S22208).

  FIG. 19 is a flowchart for explaining the calling process (S224 in FIG. 17) of the handset 22.

  First, the call control unit 2203 sends control data indicating that the handset device ID and the call button of the handset device 22 are “ON” to the main apparatus 1 via the communication control unit 2202 and the wireless IF unit 2201. It is sent out (S22401).

  Next, the call control unit 2203 accepts the telephone number of the call partner input to the dial key of the operation panel 2204 via the operation control unit 2205, and receives the telephone number of the other party from the communication control unit 2202 and the wireless IF unit 2201. 1, this telephone number is transmitted (S22402). Then, main apparatus 1 transmits a voice path setting notification to handset 22. When the call control unit 2203 receives the voice path setting notification from the main apparatus 1 via the wireless IF unit 2201 and the communication control unit 2202 (S2243), the call control unit 2203 passes the wireless IF unit 2201 and the communication control unit 2202. The ringing tone data received from the main device 1 is output from the speaker of the handset unit 2206 via the voice control unit 2207 (S22404).

  When receiving a connection response from the main device 1 via the wireless IF unit 2201 and the communication control unit 2202 (YES in S22405), the main control unit 2203 notifies the call control unit 2203 of this. In response to this, the call control unit 2203 stops the output of the ringing tone and starts a call (S22406).

  As a result, the call packet sent from the main apparatus 1 is received by the wireless IF unit 2201, and voice data is extracted by the communication control unit 2202. Then, this audio data is output from the speaker of the handset unit 2206 by the audio control unit 2207. The voice input to the microphone of the handset unit 2206 is converted into voice data by the voice control unit 2207. The voice data is stored in the call packet by the communication control unit 2202 and transmitted from the wireless IF unit 2201 to the main apparatus 1.

  Further, when the main control unit 2210 receives a notification from the main apparatus 1 via the wireless IF unit 2201 and the communication control unit 2202 for canceling the setting of the audio path for the slave unit 22 (YES in S22407), this audio path Notification of cancellation is sent to the call control unit 2203. In response to this, the call control unit 2203 stops outputting the ringing tone (S22408).

  Next, an example of a call by the parent-child phone system to which this embodiment is applied will be described.

  FIG. 20 is a sequence diagram for explaining an example of a call when the handset 22 makes a call when the handset 22 receives an incoming call to the base phone 2 placed on the base 21.

  When there is an incoming call from the external line network 5, the main device 1 recognizes that this incoming call is call data for the parent-child telephone 2 by the router function, gateway function, and call control function (S601). Then, the main device 1 confirms that the placement state of the parent-child phone 2 is “placement”, and sends an incoming call notification to the parent device 21 constituting the parent-child phone 2 (S602).

  When receiving the incoming call notification from main apparatus 1, base unit 21 sends ACK data for the incoming call notification to main apparatus 1. The main device 1 transfers this ACK data to the call data transmission source (to the gateway (S603). Then, the main device 1 sets a voice path between the call data transmission source and the parent device 21 (S604). After that, the main device 1 receives the ring tone data from the call data transmission source (S605) and transfers it to the base unit 21 (S606), and the base unit 21 starts ringing. To do.

  When the parent device 21 detects that the child device 22 placed on the own parent device 21 has been lifted (S607), the management including the telephone number of the parent child phone 2 and the placement state “not placed” is performed. Data is generated and sent to the main device 1 (S608). In response to this, the main device 1 sets the connection destination of the audio path not only to the parent device 21 but also to the child device 22. Further, a voice path setting notification for setting the voice path is generated for the slave unit 22, and the voice path setting notification is notified to the slave unit 22 (S609).

  As a result, the main device 1 transfers the ring tone data received from the call data transmission source to both the parent device 21 and the child device 22. Also, the audio data received from the parent device 21 and the child device 22 is mixed according to the setting of the parent-child information and transferred to the call data transmission source (S610, S611). The main device 1 sends connection response data to the call data transmission source (S612).

  After that, if a predetermined time has elapsed, the main device 1 cancels the voice path set between the call data transmission source and the parent device 21 (S613). As a result, the main apparatus 1 transfers the voice data received from the call data transmission source only to the handset 22. Further, only the voice data received from the handset 22 is transferred to the call data transmission source. (S614).

  Thereby, a communication path is formed between the handset 22 and the other party (S615).

  FIG. 21 is a sequence diagram for explaining an example of a call when the slave unit 22 is placed on the master unit 21 and is dialed by the master unit 21 to make a call and the slave unit 22 makes a call. It is.

  When the call button (hands-free button) is turned on (S701), base unit 21 sends control data indicating that to main apparatus 1 (S702). Thereafter, input of a destination telephone number is accepted (S703), and control data indicating the accepted destination telephone number is sent to the main apparatus 1 (S704).

  When there is a call from the extension network 4, the main device 1 uses the router function, the gateway function, and the call control function, and this call is control data indicating the call button “ON” and control data indicating the destination telephone number Recognize Then, call data with the destination telephone number as the called number is generated and sent to the external network 5 (S705). In addition, the main apparatus 1 sets a voice path between the call data transmission source and the parent device 21 (S706).

  Next, the main device 1 receives the ring tone data from the external network 5 (S707), and transfers it to the parent device 21 (S708). Then, base unit 21 outputs a ringing tone.

  When the parent device 21 detects that the child device 22 placed on the own parent device 21 has been lifted (S709), the management including the telephone number of the parent child phone 2 and the placement state “not placed” is performed. Data is generated and sent to the main apparatus 1 (S710). In response to this, the main device 1 sets the connection destination of the audio path not only to the parent device 21 but also to the child device 22. Further, a voice path setting notification for setting the voice path is generated for the slave unit 22, and this voice path setting notification is notified to the slave unit 22 (S711).

  As a result, the main device 1 transfers the ringing tone data received from the call data transmission destination to both the parent device 21 and the child device 22. Also, the audio data received from the parent device 21 and the child device 22 is mixed according to the setting of the parent-child information and transferred to the call data transmission destination (S712, S6713).

  After that, if a predetermined time has elapsed, the main device 1 cancels the voice path set between the call data transmission destination and the parent device 21 (S714). As a result, the main apparatus 1 transfers the ringing tone data received from the call data transmission destination only to the handset 22. Also, only the voice data received from the handset 22 is transferred to the call data transmission destination. (S715).

  After that, when receiving a connection response from the external network 5, the main device 1 transfers it to the child device 22 (S716). Thereby, a communication path is formed between the handset 22 and the communication partner (S712).

  The embodiment of the present invention has been described above.

  In the present embodiment, the wireless AP 3 and the parent device 21 are connected to the extension network 4 and the slave device 22 is connected to the extension network 4 through the wireless AP 3. Then, the main device 1 that accommodates the extension network 4 and the outside network 5 is made to manage the correspondence relationship between the parent device 21 and the child device 22 that constitute the parent-child phone 2, and the connection destination of the voice path to the parent-child phone 2 When switching between the parent device 21 and the child device 22 constituting the telephone 2, a predetermined time difference is provided in the switching instruction to the parent device 21 and the child device 22, and during this predetermined time, the voice data from the call partner is received as the parent data. The data is transmitted to both the device 21 and the child device 22, and the voice data from the parent device and the child device is mixed and transmitted to the other party. For this reason, even if the audio path is switched between the parent device 21 and the child device 22, the call voice can be prevented from being interrupted, and the call can be continued smoothly.

  During the call, the voice data from the other party is transmitted to both the base unit 21 and the handset 22, and the time for mixing the voice data from the base unit 21 and the handset 22 and sending it to the other party is usually normal. Therefore, the time required to occupy the communication band between the wireless network and the extension network 4 can be reduced to a short time.

  Further, in the present embodiment, when the handset 22 is placed on the base unit 21, the audio path to the base phone 2 is connected to the base unit 21, and the handset 22 is not placed on the base unit 21. In this case, the audio path for the parent / child phone 2 is connected to the child device 22. For this reason, the connection destination of the audio path to the parent / child phone 2 is switched by placing the child device 22 on the parent device 21 or lifting the child device 22 placed on the parent device 21 from the parent device 21. Therefore, the usability of the parent-child phone 2 is improved.

  In the present embodiment, when the handset 22 is placed on the base unit 21, a ring tone is sent to the base unit 21. When the handset 22 is not placed on the base unit 21, the incoming call is received. Sound is sent to the handset 22. For this reason, the transmission destination of the ringtone for the parent / child phone 2 is switched by placing the child device 22 on the parent device 21 or lifting the child device 22 placed on the parent device 21 from the parent device 21. Therefore, the usability of the parent-child phone 2 is improved.

  Further, in the present embodiment, when the handset 22 placed on the base unit 21 that is ringing an incoming call is lifted, a connection response to the incoming call is sent to the base phone 2 having the base unit 21 and the handset 22. It is sent to the external network 5. For this reason, it is possible to simultaneously realize the instruction to switch the connection destination of the voice path to the parent / child phone 2 and the instruction to connect the call to the parent / child phone 2 by the same operation.

  Further, in the present embodiment, when a call is made to the external network 5, if the handset 22 is placed on the base unit 21, the ringing tone from the external line network 5 is transferred to the base unit 21. If the child device 22 is not placed on the parent device 21, the ringing tone from the external network 5 is transferred to the child device 22. For this reason, the transmission destination of the ringing tone to the parent / child phone 2 is switched by placing the child device 22 on the parent device 21 or lifting the child device 22 placed on the parent device 21 from the parent device 21. Therefore, the usability of the parent-child phone 2 is improved.

  Further, in the present embodiment, when the handset 22 is out of the range of the wireless AP 3, the voice path to the base phone 2 is connected to the base unit 21 regardless of the placement state of the handset 22 on the base unit 21. . For this reason, it is possible to prevent the call from being disconnected from the parent / child telephone 2.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary. For example, each configuration of the main device 1, the parent / child phone 2, and the wireless AP 3 may be executed by an integrated logic IC such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA). Alternatively, it may be executed in software by a computer such as a DSP (Digital Signal Processor) or a PC (Personal Computer).

  In the present embodiment, the case where the placement state of the slave unit 22 is detected by the sensor provided in the slave unit IF unit 2108 of the master unit 21 has been described as an example. However, the present invention is not limited to this. For example, the mounting state of the child device 22 may be detected by monitoring the charging state of the child device 22 with the power supply control unit 2109 of the parent device 21.

  FIG. 22 is a diagram for explaining a modification of the slave unit IF unit 2108 and the power source control unit 2109 of the master unit 21 and the master unit IF unit 2208 and the power source control unit 2209 of the slave unit 22.

  As illustrated, in the parent device 21, the child device IF unit 2108 includes a communication terminal 21081 for acquiring a child device ID from the child device 22 and power supply terminals 21082 and 21083 for supplying power to the child device 22. And having. In addition, the power control unit 2109 measures a power supply 21091 that supplies power to the power supply terminals 21082 and 21083, a resistor 21095 inserted in the power supply line of the power supply 21091, and a current value flowing through the power supply line of the power supply 21091. It has a current meter 21093, a voltage meter 21094 that measures the voltage value between the power supply terminals 21082 and 21083, and a power supply controller 21092 that adjusts the power supplied to the power supply 21091.

  In the child device 22, the parent device IF unit 2208 is connected to the communication terminal 21081 of the parent device 21, a communication terminal 22081 for notifying the parent device 21 of the child device ID, and a power supply terminal 21082 of the parent device 21. 21, and power input terminals 22082 and 22083 for inputting power from the parent device 21. The power supply control unit 2209 includes a voltage meter 22092 that measures a voltage value between the power input terminals 22082 and 22083, and a battery 22091 that stores the power input to the power input terminals 22082 and 22083.

  In the configuration as described above, the power supply controller 21092 controls the supply power of the power supply 21091 based on the measured values of the current meter 21093 and the voltage meter 21094, and determines the placement state of the slave unit 22 based on these measured values. To detect. When the current value of the power supply line is equal to or less than a predetermined value, it is considered that the power supply terminals 21082 and 21083 are open. Further, when the voltage value between the power supply terminals 21082 and 21083 is equal to or lower than a predetermined value, it is considered that some abnormality has occurred in the slave unit 22 and the power input terminals 22082 and 22083 of the slave unit 22 are short-circuited. In such a case, it is determined that the placement state is “non-placement”. Then, when the current value of the power supply line is within a predetermined range and the voltage value between the power supply terminals 21082 and 21083 is within the predetermined range, it is determined that the mounting state is “mounted”.

Alternatively, the voltage value applied to the resistor 21095 is calculated using the output voltage of the power source 21091 and the measured value of the voltage meter 21094, and the measured value of the voltage meter 22092 of the slave unit 22 is acquired via the communication terminals 21081, 2081. And a mounting state is detected by comparing both. For example, the resistance value of the resistor 21095 is set so as to be larger than the resistance value between the power input terminals 22082 and 22083 of the slave unit 22, and a voltage difference corresponding to the difference between the two resistance values is applied to the resistor 21095. When it occurs between the voltage value and the measured value of the voltage meter 22092, it is determined that the placement state is “placement”. In other cases, it is determined that the placement state is “non-placement”.

  In the present embodiment, it is assumed that the placement state is detected on the base unit 21 side, but the placement state is detected on the handset unit 22 side, and this is notified to the main device 1 via the wireless network. You may make it do.

In the present embodiment, the handset 22 may have a function as a single phone. That is, a dedicated telephone number different from the telephone number of the parent / child phone 2 is assigned to the child device 22. A changeover switch between the parent-child phone mode and the single phone mode is also provided. When the single telephone mode is selected, communication with other terminals is performed using the telephone number assigned to the own telephone, in the same way as a normal telephone. When the telephone mode is switched, the slave unit 22 notifies the main device 1 to that effect. The main device 1 manages the telephone mode of each slave unit 22, and handles the slave unit 22 operating in the single phone mode in the same manner as when the slave unit state is “out of service”. This prevents the incoming call to the parent / child telephone 2 from being transferred to the child device 22.

  Further, in the present embodiment, the case where a wireless LAN is used for the wireless communication of the slave unit 22 has been described. However, the present invention is not limited to this. You may utilize PHS and a mobile telephone for the radio | wireless communication of the subunit | mobile_unit 22. FIG. In this case, the main apparatus 1 creates a call path for both the parent device 21 and the child device 22, determines which call path is valid, and notifies each of the parent device 21 and the child device 22. The telephone set for which the call path is valid enables voice input / output using a speaker and a microphone, and sends and receives voice data to and from the call partner. A telephone set for which the call path is invalidated disables voice input / output using a speaker and a microphone, and does not transmit / receive voice data to / from the other party.

  In the present embodiment, the slave unit 22 is connected to the master unit 21 having a parent-child relationship with the slave unit 22 via the extension network 4 and the wireless AP 3. However, the present invention is not limited to this. By installing a wireless interface in the parent device 21, the child device 22 may be directly connected to the parent device 21 having a parent-child relationship with the child device 22 via a wireless network.

FIG. 1 is a schematic configuration diagram of a parent-child telephone system to which an embodiment of the present invention is applied. FIG. 2 is a schematic configuration diagram of the main device 1. FIG. 3 is a diagram schematically showing the parent-child information storage unit 18. FIG. 4 is a flowchart for explaining the operation of the main apparatus 1. FIG. 5 is a flowchart for explaining the incoming call processing (S12 in FIG. 4) of the main apparatus 1. FIG. 6 is a flowchart for explaining the base unit incoming processing (S126 in FIG. 5) of main apparatus 1. FIG. 7 is a flowchart for explaining the slave unit incoming processing (S127 in FIG. 5) of the main apparatus 1. FIG. 8 is a flowchart for explaining the transmission process (S14 in FIG. 4) of the main apparatus 1. FIG. 9 is a flowchart for explaining the base unit transmission process (S147 in FIG. 8) of main apparatus 1. FIG. 10 is a flowchart for explaining the slave unit transmission process (S148 in FIG. 8) of the main apparatus 1. FIG. 11 is a schematic configuration diagram of the wireless AP 3. FIG. 12 is a schematic configuration diagram of the parent device 21. FIG. 13 is a flowchart for explaining the operation of base unit 21. FIG. 14 is a flowchart for explaining the incoming call process (S212 in FIG. 13) of base unit 21. FIG. 15 is a flowchart for explaining the calling process (S214 in FIG. 13) of base unit 21. FIG. 16 is a schematic configuration diagram of the slave unit 22. FIG. 17 is a flowchart for explaining the operation of the slave unit 22. FIG. 18 is a flowchart for explaining the incoming call processing (S222 in FIG. 17) of the handset 22. FIG. 19 is a flowchart for explaining the calling process (S224 in FIG. 17) of the handset 22. FIG. 20 is a sequence diagram for explaining an example of a call when the handset 22 makes a call when the handset 22 receives an incoming call to the base phone 2 placed on the base 21. FIG. 21 is a sequence diagram for explaining an example of a call when the slave unit 22 is placed on the master unit 21 and is dialed by the master unit 21 to make a call and the slave unit 22 makes a call. It is. FIG. 22 is a diagram for explaining a modification of the slave unit IF unit 2108 and the power source control unit 2109 of the master unit 21 and the master unit IF unit 2208 and the power source control unit 2209 of the slave unit 22.

Explanation of symbols

  1: main device, 2: parent / child phone, 3: wireless AP, 4: extension network, 5: outside network, 11: outside line IF unit, 12: extension IF unit, 13: communication control unit, 14: GW unit, 15: Router unit, 16: call control unit, 17: route switching unit, 18: parent-child information storage unit, 19: main control unit, 21: master unit, 22: slave unit, 31: wireless IF unit, 32: extension IF unit, 33: Communication control unit, 34: Slave unit management unit, 35: Slave unit information storage unit, 36: Main control unit, 2101: Extension IF unit, 2102: Communication control unit, 2103: Call control unit, 2104: Operation panel, 2105: Operation control unit, 2106: Hands-free unit, 2107: Audio control unit, 2108: Slave unit IF unit, 2109: Power supply control unit, 2110: Main control unit, 2201: Wireless IF unit, 2202: Communication control unit, 2203 : Call control unit, 220 : Operation panel 2205: operation control unit, 2206: handset, 2207: audio control unit, 2208: base unit IF unit, 2209: power supply control unit, 2210: The main controller

Claims (8)

A parent and child having a main unit that accommodates an external line and an extension, at least one extension telephone master unit connected to the extension, at least one extension telephone slave unit, and a wireless access point connected to the extension A telephone system,
The extension telephone cordless handset is
Connected to the extension via the wireless access point,
The main unit is
A parent-child relationship storage means for storing a correspondence relationship between the extension telephone master unit and the extension telephone slave unit constituting a parent-child phone;
Referring to the parent-child relationship storage means, a voice path switching means for switching the connection destination of the voice path to the parent-child phone between the extension telephone master unit and the extension telephone slave unit constituting the parent-child phone;
The other party that transmits voice data from the extension telephone master unit registered in the parent-child relationship storage means or the other party connected to the extension telephone slave unit to both the extension telephone master unit and the extension telephone slave unit Having voice data transmission means,
When a predetermined state change occurs in the extension telephone master unit or the extension telephone slave unit, or when a predetermined operation is performed, the voice path switching means is instructed to the extension telephone master unit. Instructing the switching of the connection destination of the voice path to the parent / child phone including the telephone or the extension telephone and the voice data from the other party for a predetermined time before or after instructing the switching And a control means for transmitting to both the master unit and the extension telephone slave unit. The parent-child phone system according to claim 1,
At least one of the extension telephone master unit and the extension telephone slave unit constituting the parent / child phone is:
A placement state detecting means for detecting a placement state of the extension telephone slave unit on the extension telephone master unit;
Mounting state transmitting means for transmitting information indicating the mounting state detected by the mounting state detecting means to the main device;
The main unit is
It further has a placement status receiving means for receiving information indicating a placement status from the extension telephone master or the extension telephone slave,
The control means includes
The information indicating the placement status received by the placement status receiving means indicates that the extension telephone slave is placed on the extension telephone master that constitutes the extension telephone slave and the parent-child telephone. Instructing the voice path switching means to switch to the extension telephone base unit of the voice path connection destination for the parent / child phone,
The information indicating the placement status received by the placement status receiving means indicates that the extension telephone handset is not placed on the extension telephone base phone constituting the extension telephone handset and the parent-child phone. If there is, the parent-child telephone system characterized by instructing the voice-route switching means to switch to the extension telephone slave unit to which the voice path is connected to the parent-child telephone. The parent-child phone system according to claim 2,
The control means includes
Information indicating the placement status received from at least one of the extension telephone master unit and the extension telephone slave unit that constitutes the parent telephone set that is the destination of the call when the call is received Indicates that the extension cordless handset is mounted on the extension phone master phone, the ring tone is sent to the extension phone master phone, and the extension phone slave phone is set to the extension phone master phone. A parent-child telephone system characterized by sending a ring tone to the extension telephone handset when it is indicated that it is not placed on the telephone. The parent-child phone system according to claim 3,
The control means includes
When the ring tone is being sent to the extension telephone master unit, it is received from the extension telephone master unit or the extension telephone slave unit constituting the extension telephone master unit and the master phone by the above-mentioned setting state receiving means. When the information indicating the placement state is changed to one indicating that the extension telephone slave is not placed on the extension telephone master, response information for the call is transmitted to the external line. Parent-child phone system. The parent-child phone system according to claim 2,
The control means includes
When placing a call, the placement state received from at least one of the extension telephone master unit and the extension telephone slave unit constituting the parent-child telephone that is the call originator is shown by the placement state receiving unit When the information indicates that the extension telephone slave is mounted on the extension telephone master, a ringing tone indicating that the other party is being called is sent to the extension telephone master, A parent-child phone system characterized in that, when an extension telephone handset indicates that the extension telephone handset is not mounted on the extension telephone main handset, the ringing tone is transmitted to the extension telephone handset. The parent-child phone system according to claim 5,
The control means includes
When the ring tone is being sent to the extension telephone master unit, it is received from the extension telephone slave unit constituting the extension telephone master unit or the extension telephone master unit and the master phone unit by the above-described placement state receiving means. When the information indicating the placement status is changed to indicate that the extension telephone slave is not placed on the extension telephone master, the destination of the ringing tone is sent from the extension telephone master to the extension telephone. A parent-child phone system characterized by switching to a handset. The parent-child phone system according to any one of claims 1 to 6,
The control means includes
Refer to the parent-child relationship storage means, and when the extension telephone slave unit and the extension telephone slave unit constituting the parent-child phone are out of the range of the wireless access point, the placement status received by the placement status reception means Regardless of the information shown, the voice path switching means is instructed to switch the voice path connection destination for the parent telephone to the extension telephone master unit. The parent-child phone system according to any one of claims 1 to 7,
The extension telephone cordless handset is
In addition to the telephone number assigned to the parent / child phone including the extension telephone slave unit, a single telephone communication means for communicating with other terminals using the telephone number assigned to the extension telephone slave unit is provided. A parent-child phone system.

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