JP2005079857A - Intercom system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize transmitting of a video of a camera disposed at a position where a slave unit exists to a portable master unit when called from the slave unit. <P>SOLUTION: An intercom system includes a plurality of slave units 1 which are provided in the room of a hospital, and in which identification numbers are given; the master unit 2 which talks when called from the slave unit; a portable master unit 3 which is carried by a nurse in a facility, which can display a video, and which talks when called from the slave unit; a plurality of cameras 4 provided together with the slave units in the room to transmit video signals obtained by photographing by a digital data protocol; and an IP telephone exchange 5 connected to the master unit, the portable master unit, and the camera to transmit a call signal from the slave unit to the portable master unit and to transmit the video signal transmitted from the camera as digital data to the portable master unit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an interphone system, and more particularly to an interphone system that transmits an image of a camera disposed at a position where a child device is present to a portable parent device when a call is made from the child device.

  Conventionally, a nurse call cordless handset provided with a call button and an emergency call button provided on each bed in a hospital room, a nurse call master set installed in a nurse station, and a call button of the nurse call cordless handset An adapter that detects a call to the emergency call button and reports the call to the nurse call master via the controller, and a portable terminal that can be carried by a nurse and receive calls from the nurse call slave or nurse call master There is known a nurse call device provided with (for example, see Patent Document 1).

  This nurse call device can ring a ringing tone on a portable terminal when a call is made from a nurse call slave installed in the vicinity of the bed, and can make a call between the portable terminal and the nurse call slave. .

JP 2000-224321 A

  Since the nurse call device disclosed in Patent Document 1 described in the background art does not have a transmission line for video signals, it can exchange audio, but cannot transmit video.

  In recent years, intercom systems that can display video on mobile terminals such as mobile TV door phone (registered trademark) have also appeared, but these transfer the display content on the monitor of the main unit to the server once via an external line. However, since the mobile terminal accesses the server to obtain video, and it is necessary to pay a call fee to the mobile carrier for each video display, there is a running cost, and the mobile terminal used as an extension Could not be used.

  Furthermore, an interphone system that sends a video signal from the parent device to the portable terminal has been devised, but in order to transfer data to the portable terminal, the video signal transmitted from the parent device is once sent via the exchange. Because it was necessary, special modification was required to pass the video signal through the exchange, so it could not be realized.

  An intercom system according to a first aspect of the present invention is an intercom system used in a facility such as a hospital, a geriatric health facility, a kindergarten, or a school that accommodates persons who should be nursing, nursing, nursing or advocating. A nursery, a caregiver, a staff member, or a teacher can carry and display images in a facility. A portable main unit for calling and calling from the machine, a plurality of cameras provided in the room together with the slave unit for transmitting video signals captured by a digital data protocol such as TCP / IP, the main unit, and the portable main unit And an IP telephone exchange that is connected to the camera, transmits a calling signal from the slave unit to the portable base unit, and transmits a video signal transmitted from the camera as digital data to the portable base unit. Therefore, when a call is made from the slave unit, the IP telephone exchange is specified by the identification number of the called slave unit together with the call signal from the slave unit and the identification number of the called slave unit. The video signal transmitted from the camera is transmitted to the portable base unit.

  The first mode is an interphone system according to the second mode of the present invention, in which the IP telephone exchange receives a call signal from the slave unit via the master unit.

  The first aspect or the second aspect is an interphone system according to a third aspect of the present invention, wherein the camera is connected to the IP telephone exchange via a network hub.

  Each of the first to third aspects is an interphone system according to a fourth aspect of the present invention. In the interphone system, the IP telephone exchange is connected to an external line such as an analog telephone line or an IP telephone line, and the portable master unit is an external line. It can be connected to the outside via a communication line.

  Each of the first to fourth aspects is an interphone system according to a fifth aspect of the present invention, in which a general telephone is connected to the IP telephone exchange.

  Each of the first to fifth aspects is an interphone system according to a sixth aspect of the present invention. In the interphone system, the IP telephone exchange stores a video signal to be transmitted when calling from the slave unit.

  Each of the first to sixth aspects is an interphone system according to the seventh aspect of the present invention, and is provided with a server connected to the IP telephone exchange and storing a video signal. The IP telephone exchange transmits when calling from the slave unit. Video data to be transmitted to the portable base unit and the server.

  Each of the first to seventh aspects is an interphone system according to an eighth aspect of the present invention, wherein the camera changes the camera angle and / or magnification by a control signal from the IP telephone exchange.

  Each of the first to eighth aspects is the intercom system according to the ninth aspect of the present invention. In the intercom system, a room provided with the slave unit includes a sensor such as a voice sensor. The portable base unit is called, and the camera angle and / or magnification of the camera is changed according to the sensing output signal from the sensor.

  Each of the first to ninth aspects is the intercom system according to the tenth aspect of the present invention. The intercom system includes an entrance handset at the entrance of the facility, and the IP telephone switchboard Alternatively, a call signal is transmitted to the portable base unit.

  Each of the first to tenth aspects is the intercom system according to the eleventh aspect of the present invention, wherein the entrance unit has a built-in entrance unit camera.

  According to an eleventh aspect, in the intercom system according to the twelfth aspect of the present invention, the entrance slave camera camera transmits a digital video signal.

  An eleventh aspect is an intercom system according to a thirteenth aspect of the present invention, wherein the front door camera transmits an analog video signal, and converts the video signal from the slave camera into digital data. It is equipped with a data converter.

  Each of the first to thirteenth aspects is the intercom system according to the fourteenth aspect of the present invention, wherein the loudspeaker is provided outdoors such as in a garden of a facility, and the master unit and / or the portable master unit broadcasts a broadcast signal Is to send.

  Each of the first to fourteenth aspects is an intercom system according to a fifteenth aspect of the present invention, wherein the slave unit includes a child lock that prevents malfunction due to mischief.

  According to the first aspect of the intercom system of the present invention, since the camera installed in the room is directly connected to the IP telephone exchange capable of processing digital signals, the video signal from the camera is digitally converted by the IP exchange. Since the data can be transmitted to the portable parent device, the indoor image captured by the camera can be displayed on the portable parent device without performing special image processing in the parent device.

  According to the second aspect of the intercom system of the present invention, since the IP telephone exchange can receive a call signal from the slave unit via the master unit, the identification number of the called slave unit can be specified. it can.

  According to the third aspect of the intercom system of the present invention, since the IP telephone exchange and the camera are connected by the network hub, the wiring work is facilitated.

  According to the fourth aspect of the intercom system of the present invention, since the IP telephone exchange can be connected to the outside via an external communication line, the portable master is connected to an interphone device such as a slave, a master, etc. It becomes possible to communicate with various communication devices connected to the.

  According to the fifth aspect of the intercom system of the present invention, since the IP telephone exchange can also connect a general telephone, it is not necessary to separately introduce an external line exchange and an interphone exchange.

  According to the sixth aspect of the intercom system of the present invention, since the IP telephone exchange can store video data, even if the portable base unit wants to check the video later, it is stored in the IP telephone exchange. Video can be browsed using video data.

  According to the seventh aspect of the intercom system of the present invention, since the server for storing the video data is connected to the IP telephone exchange, the capacity for storing the video data can be greatly increased.

  According to the eighth aspect of the intercom system of the present invention, since only one camera is installed in the room of the facility, it is possible to display the video of the person who has called by the slave unit. An imaging blind spot by a camera can be eliminated.

  According to the ninth aspect of the intercom system of the present invention, it is possible to display an image in the direction in which the sensor provided in the room of the facility responds, so that it is possible to eliminate the blind spot taken by the camera.

  According to the tenth aspect of the intercom system of the present invention, the IP telephone exchange can transmit a call signal to the parent device or the portable parent device at the time of calling from the entrance child device. The machine can answer not only calls from inside the facility but also calls from the entrance.

  According to the eleventh aspect of the intercom system of the present invention, since the entrance slave unit has a built-in slave camera, the portable master unit displays not only images from the inside of the facility but also images from the entrance. be able to.

  According to the twelfth aspect of the intercom system of the present invention, since the front-facing handset camera can transmit a digital video signal, the portable base unit can display the video from the front door as well as the indoor camera in the facility. The video signal from the front door camera can be transmitted as digital data to the portable parent device by the IP exchange, so the room captured by the portable parent device with the camera without any special video processing. Can be displayed.

  According to the thirteenth aspect of the intercom system of the present invention, since the video signal from the entrance child camera is provided with a data converter for converting into digital data, the entrance child device incorporating the entrance child camera is Existing equipment can be used as it is.

  According to the fourteenth aspect of the intercom system of the present invention, since the loudspeaker is provided outdoors, it is possible to broadcast to a courtyard of a hospital, a garden of a kindergarten, etc. using a portable parent device or a parent device. it can.

  According to the fifteenth aspect of the intercom system of the present invention, since the child machine is provided with the child lock, it is possible to prevent malfunction even if the child performs mischief in a kindergarten or the like.

  The best mode for carrying out the intercom system of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, an intercom system that is the best mode for carrying out the present invention is a nurse call system used in a hospital that accommodates a patient who is a caregiver, and has a call notification function and a call function. A master unit 2 installed in the nurse station NS, a call notification function and a call function, and a plurality of portable master units 3 carried by a nurse at the time of patrol, etc., and a call function and a call function. Connected to the machine 2 and provided in the rooms of the hospital rooms SRA, SRB and the common room CU together with the child machine 1 provided with the identification number respectively installed in the hospital bed SRA, SRB and the common room CU, Connected to the camera 4 that transmits the video signal S1 of the video imaged by the general-purpose protocol for digital data such as TCP / IP, the base unit 2, the portable base unit 3, and the camera 4 The analog call signal S2 from the slave unit 1 transmitted via the master unit 2 is transmitted to the portable master unit 3, and the video signal S1 transmitted from the camera 4 is transmitted to the portable master unit 3 as digital data. An IP (Internet Protocol) telephone exchange 5 is provided. The camera 4 is also installed in the hospital garden GD.

  The IP telephone exchange 5 is an exchange having a function of converting an analog signal and an IP packet (digital). When a call is made from the handset 1, the call signal S2 and the call from the handset 1 are sent to the portable base unit 3. The video signal S1 transmitted from the camera 4 specified by the identification number of the called child device 1 is transmitted to the portable parent device 3 together with the identification number of the called child device 1. Specifically, since the base station 12 installed in the corridor or garden GD in the hospital is connected to the IP telephone exchange 5, the base station 12 and the portable base unit 3 perform wireless communication. Become. Each camera 4 is connected to a network hub 6 connected to an IP telephone exchange 5. This facilitates wiring work. Such an IP telephone exchange 5 identifies each hospital room SRA, SRB, and common room CU from the call signal S2, and has a correspondence table of each hospital room and camera address stored in the IP telephone exchange 5, and this correspondence table It is possible to specify the IP address of the camera 4 in the hospital room or common room where the handset 1 that has been called based on is installed. Therefore, the video signal S1 transmitted from the camera 4 specified by the identification number of the called child device 1 can be transmitted to the portable parent device 3.

  The IP telephone exchange 5 has a function of accumulating the video signal S1 to be transmitted when the handset 1 is called. As a result, the IP telephone exchange 5 can store the video data, so that the portable base unit 3 can use the video data stored in the IP telephone exchange 5 to check the video later. You can view the video. Further, a server 13 for storing the video signal S1 may be connected to the IP telephone exchange 5. Thereby, the capacity | capacitance which accumulate | stores video data can be increased significantly.

  Further, since the IP telephone exchange 5 can be connected to an external communication line 7 such as an analog telephone line or an IP telephone line, the portable base unit 3 is connected to interphone devices such as the handset 1, the base unit 2, and the camera 4. Communication with various communication devices connected to the outside line communication line 7 becomes possible. Further, if the general telephone 8 is connected to the IP telephone exchange 5, it is not necessary to separately introduce an outside line exchange and a nurse call exchange, and only by introducing this single IP telephone exchange 5, Communication connection with the outside line communication line 7 becomes possible.

  The IP telephone exchange 5 has a function of changing the angle and magnification of the camera 4 by transmitting a control signal based on remote control by an external device such as the parent device 2 or the portable parent device 3. As a result, it is possible to display an image of the patient who has called the child device 1 by installing only one camera 4 in each room, and therefore, it is possible to eliminate an imaging blind spot by the camera 4. In the garden GD, a single camera 4 can capture a wide range as an imaging range. This IP telephone exchange 5 has a correspondence table of the position of the handset 1 in each room of the hospital rooms SRA, SRB and the common room CU and the imaging angle and magnification of the camera 4 to be set, and the handset that has been called 1 has a function of changing the imaging angle and magnification of the camera 4 so that the periphery of the camera 1 can be imaged.

  Such an IP telephone exchange 5 is connected to the main unit 2. A sensor 16 such as a voice sensor provided in each of the sickrooms SRA, SRB and the common room CU is connected to the master unit 2. The IP telephone exchange 5 has a correspondence table between the sensing direction of the sensor 16 in each room of the sickrooms SRA, SRB and the common room CU and the imaging angle and magnification of the camera 4 to be set, and a sensing output signal from the sensor 16 It has a function of changing the angle and magnification of the camera 4 according to S3.

  Further, a correspondence table for changing the angle and magnification of the camera 4 may be provided in the server 13 connected to the IP telephone exchange 5, and the direction around the image of the handset 1 and the direction of the sensor 16 that responds. Thus, it is possible to eliminate the blind spot imaged by the camera 4.

  Note that the angle and magnification of the camera 4 may be changed based on the function of the camera 4, either the angle or the magnification, or both.

  The master unit 2 is connected to a loudspeaker 15 provided in the common room CU and the garden GD. As a result, the base unit 2 can transmit the broadcast signals S4 and S5 to each loudspeaker 15, and the portable base unit 3 sends the base station 12 → IP telephone exchange 5 → base unit 2 to each loudspeaker 15. Since the broadcast signals S4 ′ and S5 ′ can be transmitted through the main unit 2 and the portable base unit 3, the loudspeaker broadcast can be performed in the common room CU or the garden GD of the hospital.

  Furthermore, the main unit 2 is connected to an entrance cordless handset 10 for installation at a hospital entrance SD. The IP telephone exchange 5 has a function of transmitting a digital calling signal to the portable parent device 3 when calling from the front door device 10. As a result, the portable master unit 3 can respond not only to calls from the nurse station NS, hospital rooms SRA, SRB and the common room CU (nurse calls) but also to calls from the service port SD. . The entrance slave unit may be the entrance slave unit 11 in which the camera 111 is built. Thereby, the portable parent device 3 can display not only the images from the hospital rooms SRA, SRB, the common room CU and the garden GD but also the images from the entrance SD.

  The IP telephone exchange 5 to which the entrance cordless handset 11 is connected has a correspondence table of service ports SD stored in the IP telephone exchange 5 and camera addresses, and a call signal S6 transmitted from the entrance cordless handset 11. In addition to specifying the service port SD, the IP address of the camera 111 built in the entrance cordless handset 11 called based on the correspondence table can be specified. Therefore, the analog video signal S7 transmitted from the camera 111 specified by the identification number of the called entrance cordless handset 11 is sent to the data converter 14 via the master unit 2, and the data converter 14 sends this video signal. Since S7 is converted into a digital video signal S70 and transmitted to the IP telephone exchange 5, the IP telephone exchange 5 can transmit the video signal S70 to the portable base unit 3 via the base station 12.

  In general, since an analog system is the mainstream of cameras used in the entrance unit, the master unit 2 is connected via the data converter 14 that converts the analog video signal S7 sent from the camera 111 into a digital video signal S70. And IP telephone exchange 5 are connected. Thereby, the existing entrance child machine with a camera can be used.

  Also, when using a camera 111 that sends a digital video signal to the camera 111 built in the front door 11, the video signal is sent to the IP telephone exchange 5 via the master 2, or The camera 111 and the IP telephone exchange 5 may be connected so that the video signal can be sent directly to the IP telephone exchange 5. As a result, the portable master unit 3 also uses the IP telephone exchange 5 to convert the digital video signal from the camera 111 of the front door slave unit 11 into the portable master unit 3 in the same manner as the camera 4 in the hospital room. Therefore, the room image taken by the camera 111 can be displayed on the portable parent device 3 without performing special image processing in the parent device 2.

  In the nurse call system configured as described above, for example, when a call is made by the child device 1 of the hospital room SRA, the call signal S2 is transmitted to the parent device 2, and the parent device 2 calls the patient room or the bed that is called together with the ringing sound. The display corresponding to the number lights up. Further, when transfer to the portable base unit 3 is set in the base unit 2, the base unit 2 sends a call signal S 2 to the IP telephone exchange 5 at the same time as the display unit is turned on. The IP telephone exchange 5 that has received the call signal S2 identifies the hospital room SRA from the identification number of the called child machine 1 from the call signal S2, and based on the correspondence table of the hospital room and the camera address stored in the IP telephone exchange 5 The IP address of the camera 4 provided in the hospital room SRA is specified. That is, since the IP telephone exchange 5 can receive the calling signal S2 from the child device 1 via the parent device 2, the identification number of the called child device 1 can be specified. At this time, the IP telephone exchange 5 can capture the periphery of the called handset 1 based on the correspondence table between the position of the handset 1 in each room and the imaging angle and magnification of the camera 4 to be set. Then, a control signal is sent to the camera 4 to change the imaging angle and magnification of the camera 4. Since the camera 4 that has started photographing the periphery of the handset 1 that has been called in this way can communicate digital signals to the IP telephone exchange 5 via the network hub 6 by the digital data protocol, the IP telephone exchange 5 can communicate with the camera 4. The video signal (digital) S1 is converted into a format that can be browsed by the portable base unit 3, and the video signal (digital) S10 is wirelessly transmitted from the base station 12 together with the calling signal (digital) S20 as a radio signal. When the portable base unit 3 receives this wirelessly transmitted paging signal (digital) S20, it can respond by checking the facial expression of the patient and the state of the patient's room by the video signal (digital) S10 transmitted wirelessly at the same time. Whether or not there is urgency for the patient can also be confirmed on the video.

  Since the video signal (digital) S1 sent from the camera 4 is stored in the IP telephone exchange 5 or the server 13, the video at the time of calling can be confirmed at a later date.

  Next, when the voice sensor 16 detects the voice of the patient in the hospital room SRB, the sensor output signal S3 is transmitted from the voice sensor 16 to the master unit 2, and the master unit 2 sends the sense output signal S3 to the IP telephone exchange 5. Is sent out. The IP telephone exchange 5 that has received the sensing output signal S3, based on the correspondence table of the sensing direction of the sensor 16 in each room and the imaging angle and magnification of the camera 4 to be set, stored in the IP telephone exchange 5, The IP address of the camera 4 provided in the SRB is specified, and the imaging angle and magnification of the camera 4 are changed. Since the camera 4 that has started photographing in the direction sensed by the sensor 16 in this way can communicate digital signals to the IP telephone exchange 5 via the network hub 6 by the digital data protocol, the IP telephone exchange 5 can communicate with the IP telephone exchange 5 from the camera 4. The video signal (digital) S1 is converted into a format that can be browsed by the portable parent device 3, and the video signal (digital) S10 is wirelessly transmitted from the base station 12 as a wireless signal. The portable base unit 3 can respond by confirming the facial expression of the patient and the state of the patient's room by using the wirelessly transmitted video signal (digital) S10. Can do.

  In addition, even when a call is made from the entrance terminal 11 of the service entrance SD, the call signal S6 is transmitted to the master unit 2 in the same manner as the above-described hospital rooms SRA, SRB and the common room CU. The display unit corresponding to the called service port SD lights up. At the same time, the base unit 2 sends a call signal S6 to the IP telephone exchange 5. The IP telephone exchange 5 that has received the call signal S6 identifies the service port SD from the call signal S6 and, based on the correspondence table of the service port SD and the camera address stored in the IP phone switch 5, stores the service port SD in the service port SD. The IP address of the camera 111 of the provided entrance cordless handset 11 is specified. The camera 111 that has started photographing the surroundings of the called entrance slave unit 11 sends a video signal (analog) S7 to the master unit 2, and the master unit 2 sends the video signal (analog) S7 to the data converter 14. To send. The data converter 14 converts the video signal (analog) S7 into a digital video signal S70 and sends it to the IP telephone exchange 5. The IP telephone exchange 5 converts the video signal (digital) S70 into a format that can be viewed by the portable base unit 3, and wirelessly transmits the video signal (digital) S70 from the base station 12 together with the calling signal (digital) S60 as a radio signal. To do. Upon receiving the call signal S60 transmitted wirelessly, the portable base unit 3 can confirm the person who has called at the service port SD with a video by the video signal (digital) S70 transmitted at the same time.

  In addition, when there is a call at the entrance terminal 10 of the service entrance SD, all except the video signal communication when the call is received from the entrance terminal 11, the description is omitted.

  In the case of a call, when there is a call from the child device 1 or the entrance child device 10 or 11 to the parent device 2, a nurse or the like of the nurse station NS picks up the handset of the parent device 2 and the child device 1 or the door child. A call path is established between the machines 10 and 11 and the parent machine 2 to establish a call. Also, in the portable parent device 3, by operating to the calling state, a communication path is formed between the child device 1, the entrance child devices 10 and 11, and the portable parent device 3, and a communication path is established. In this case, since the IP telephone exchange 5 converts the analog voice signal and the digital voice signal, the call is established.

  As described above, by including the IP telephone exchange that transmits the video signal sent from the camera provided in the hospital room or the like as digital data to the portable base unit, the image is captured by the camera in the hospital room or the like with a simple device configuration. Video can be sent to the portable base unit.

  In the best mode of the present invention, for convenience, there are two rooms A and B. However, the present invention is not limited to this, and the effect of the present invention can be obtained no matter how many rooms are provided. .

  In the best mode of the present invention, the parent device 2 does not have a display means, but the cameras 4 of the hospital rooms A and B and the common room CU and the camera of the entrance unit 11 with the camera are used. Display means may be provided so that the video imaged at 111 can be confirmed at the nurse station.

  The present invention has been described with reference to the specific embodiments shown in the drawings. However, the present invention is not limited to these embodiments shown in the drawings, and as long as the effects of the present invention are exhibited, the present invention is not limited thereto. It goes without saying that any configuration known to date can be adopted.

  In the best mode for carrying out the intercom system of the present invention described above, it was used as a nurse call system in a hospital. However, the present invention is not limited to this, and care or protection for elderly insurance facilities, kindergartens, schools, etc. Any facility that can accommodate a person can be applied, and the portable parent device 3 is carried by a caregiver, a staff member, a teacher, or the like. Further, in the case of a kindergarten or a nursery school, as shown in FIG. 1, it is preferable that the child device 1 is provided with a child lock 101 so that a malfunction can be prevented even if a child performs a mischief.

The block diagram which shows one Embodiment of the best embodiment by the intercom system of this invention.

Explanation of symbols

1 …… Slave unit 2 …… Base unit 3 …… Portable base unit 4 …… Camera 5 …… IP telephone exchange 6 …… Network hub 7 …… External communication line 8 …… General phone 10 …… Wide unit 11 …… Entrance slave with camera 13 …… Server 14 …… Data converter 15 …… Loudspeaker 16 …… Sensor 101 …… Child lock 111 …… Entrance slave camera

Claims (15)

An intercom system used in hospitals, nursing homes, kindergartens, schools, etc. for nursing, nursing, nursing or advocating persons,
A plurality of slave units (1) provided in the room of the facility and assigned with an identification number, and a master unit (2) for calling and calling from the slave unit, and nurses, caregivers, and staff in the facility Alternatively, the teacher can carry and display images, and the portable parent unit (3) for calling and calling from the child unit and the indoor unit together with the child unit and taking images using a digital data protocol such as TCP / IP Connected to a plurality of cameras (4) for transmitting video signals, the master unit, the portable master unit and the camera, and transmits a call signal from the slave unit to the portable master unit and transmitted from the camera An IP telephone exchange (5) for transmitting the received video signal as digital data to the portable parent device, so that the IP telephone exchange can receive the portable parent device when a call is made from the child device. To the above An interphone for transmitting a video signal transmitted from a camera specified by the identification number of the called slave unit together with the calling signal from the device and the identification number of the called slave unit to the portable master unit system.   2. The intercom system according to claim 1, wherein the IP telephone exchange receives a call signal from the slave unit via the master unit.   The interphone system according to claim 1 or 2, wherein the camera is connected to the IP telephone exchange via a network hub (6).   The IP telephone exchange is connected to an external line (7) such as an analog telephone line or an IP telephone line, and the portable master unit can be connected to the outside via the external line. The intercom system according to any one of claims 1 to 3.   The intercom system according to any one of claims 1 to 4, wherein a general telephone (8) is connected to the IP telephone exchange.   6. The interphone system according to claim 1, wherein the IP telephone exchange stores the video signal to be transmitted when calling from the slave unit.   A server (13) connected to the IP telephone exchange and storing the video signal is provided, and the IP telephone exchange transmits the video data to be transmitted when calling from the slave unit to the portable master unit and the server. The intercom system according to any one of claims 1 to 6, wherein the intercom system is any one of the above.   8. The interphone system according to claim 1, wherein the camera changes a camera angle and / or a magnification according to a control signal from the IP telephone exchange.   A sensor (16) such as an audio sensor is provided in the room where the slave unit is provided, and the master unit and / or the portable master unit is called by sensing the sensor, and a sensor output signal is output from the sensor. 9. The intercom system according to claim 1, wherein a camera angle and / or a magnification of the camera is changed accordingly.   An entrance handset (10, 11) is provided at the entrance of the facility, and the IP telephone exchange transmits a call signal to the base unit and / or the portable base unit when calling from the entrance handset. The intercom system according to any one of claims 1 to 9, wherein the intercom system is any one of claims 1 to 9.   The intercom system according to any one of claims 1 to 10, wherein the entrance slave unit has a built-in entrance slave unit camera (111).   The intercom system according to claim 11, wherein the front door camera is configured to transmit a digital video signal.   The said entrance cordless handset camera sends out an analog video signal, and was provided with the data converter (14) for converting the video signal from the said handset camera into digital data. 11. The intercom system according to 11.   The loudspeaker (15) is provided outdoors such as a garden of the facility, and the master unit and / or the portable master unit transmits a broadcast signal to the loudspeaker. The intercom system according to any one of claims. The intercom system according to any one of claims 1 to 14, wherein the slave unit includes a child lock (101) for preventing malfunction due to mischief.

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