JP5430915B2 - Call control method and intercom system - Google Patents

Description

  The present invention relates to a call control method and an interphone system using the call control method.

  In recent years, a video / audio transfer terminal has been installed on an existing intercom system that includes a doorphone slave unit, a human sensor, and a surveillance camera installed outside a dwelling unit, such as a front door, and an intercom base unit installed in a dwelling unit. An intercom system in which a call terminal such as a mobile phone is connected is known (for example, Patent Document 1).

  In this intercom system, when a call button of a door phone slave unit is pressed by a visitor, a video and audio signal of the visitor is transmitted to the call terminal via the interphone master unit and the video / audio transfer terminal. Therefore, the user can confirm a visitor from whereabouts.

Patent Document 2 discloses a technology that enables a call terminal including a mobile phone to receive video and audio signals without going through a mobile phone communication network in the interphone system as described above.
JP 2008-135880 A JP 2008-135895 A

  However, in the conventional intercom system, when a communication path is established between a certain doorphone slave unit or surveillance camera and the call terminal, there is no particular consideration for calling another doorphone slave unit. There is a problem that calls from other intercoms are ignored.

  An object of the present invention is to provide a call control method and an intercom system capable of preventing a call to another door phone slave unit from being ignored when a communication path between a slave unit and a call terminal is established. Is to provide.

  (1) A call control method according to an aspect of the present invention includes a plurality of slave units, a master unit connected to the plurality of slave units, a video / audio transfer terminal connected to the master unit, and the video / audio transfer. A call control method for an intercom system comprising a call terminal connected to a terminal, wherein the video / audio transfer terminal establishes a call with the call terminal, and a first handset of the plurality of handset A first step of establishing a communication path with the call terminal, and a second child different from the first handset after the video / audio transfer terminal has established the call path according to the first step. A second step of accepting a call request from the machine to the call terminal, and when the video / audio transfer terminal accepts a call request of the second step, a call request is made from the second slave unit A third step of notifying the calling terminal of Eteiru.

  An intercom system according to another aspect of the present invention includes a plurality of slave units, a master unit connected to the plurality of slave units, a video / audio transfer terminal connected to the master unit, and the video / audio transfer. An interphone system comprising a call terminal connected to a terminal, wherein the video / audio transfer terminal establishes a call with the call terminal, and a first slave unit and the call terminal among the plurality of slave units A first means for establishing a communication path of the first and a second request for accepting a call request to the call terminal from a second handset different from the first handset after the establishment of the call path by the first means. And a third means for notifying the call terminal that a call request has been received from the second handset when a call request by the second means is received. .

  According to these configurations, after a call path is established between the first handset and the call terminal, when a call request is made from the second handset, the video / audio transfer terminal notifies the call terminal to that effect. To do.

  Therefore, the user of the call terminal can know that the second handset has been called during a call with the first handset, and prevent the second handset from being ignored. Can do.

  (2) a fourth step in which a call terminal that is notified of a call request from the second handset in the third step receives a predetermined operation from a user and notifies the video / audio transfer terminal; The fifth step in which the video / audio transfer terminal that has received the notification in the fourth step establishes a call path between the second handset and the call terminal without disconnecting the call with the call terminal. It is preferable to further provide.

  According to this configuration, when the call path between the call terminal and the first slave unit is established, the second slave unit is called, and the user of the call terminal performs an operation corresponding to the call, The call path between the second handset and the call terminal is established without disconnecting the call between the voice transfer terminal and the call terminal. Therefore, the user of the call terminal can promptly respond to the call of the second slave unit.

  (3) When priority is set in advance for the first and second slave units, and the video / audio transfer terminal has a higher priority of the second slave unit than a priority of the first slave unit It is preferable to execute the fifth step without receiving the notification in the fourth step.

  According to this configuration, even when the call terminal and the first handset are in a call, the user of the call terminal can make a call from the second handset having a higher priority than the first handset, It can respond reliably.

  (4) The call terminal having a call path established in the fifth step further includes a sixth step of accepting a predetermined operation from a user and notifying the video / audio transfer terminal, wherein the video / audio transfer terminal includes: It is preferable that the communication path between the second slave unit and the call terminal is unidirectional from the second slave unit to the call terminal until the notification in the sixth step is received.

  According to this configuration, even when the second handset is called during a call with the first handset, the call terminal does not perform a predetermined operation for responding to the call until the second handset is called. The call path is unidirectional from the second handset to the call terminal. Therefore, a visitor who has called the second handset cannot view the voice or the like of the user of the call terminal, but the user of the call terminal can view the sound or the like from the second handset. . Therefore, the user of the call terminal can select whether or not to answer the call after confirming the call from the second slave unit according to the voice from the second slave unit or the like.

  (5) After the communication path between the second slave unit and the call terminal is established in the fifth step, the video / audio transfer terminal communicates with the first slave unit. When the operation for resuming is accepted, it is preferable to re-establish the communication path between the first slave unit and the call terminal.

  According to this configuration, the user of the call terminal can resume the call with the first handset when the response to the call of the second handset ends.

  (6) The fourth step in which the call terminal to which the call signal has been transferred in the third step receives a predetermined operation from the user and notifies the video / audio transfer terminal, and the notification in the fourth step The video / audio transfer terminal disconnects the call with the call terminal, establishes a call with the call terminal again, and establishes a call path between the second handset and the call terminal. It is preferable to further comprise a step.

  According to this configuration, when the call path between the call terminal and the first slave unit is established, when the second slave unit is called, the user of the call terminal calls the second slave unit. Can respond.

  (7) It is preferable that the plurality of slave units include at least one of a door phone slave unit and a monitoring camera.

  According to this configuration, the call terminal can receive a call signal from the door phone slave unit and the monitoring camera.

  According to the present invention, the user of the call terminal can know that the second handset has been called during a call with the first handset, and the second handset call is ignored. Can be prevented.

(Embodiment 1)
The intercom system according to Embodiment 1 of the present invention will be described below. FIG. 1 shows an overall configuration diagram of an intercom system according to the first embodiment. This intercom system is applied to, for example, an intercom system in a detached house, and includes a call terminal 1, a video / audio transfer terminal 3, an interphone master unit 4, a plurality of interphone sub-master units 51 to 5M (M is an integer of 2 or more), a plurality of interphone systems. Door phone slave units 61 to 6N (N is an integer of 2 or more) and a plurality of sensor camera slave units 71 to 7N.

  In the following description, when the interphone sub-base units 51 to 5N are collectively referred to, the interphone sub-base unit is denoted by a number 5, and when the door phone sub-units 61 to 6N are collectively referred to, the door phone sub-unit is denoted by a reference numeral 6. When the sensor camera slave units 71 to 7N are collectively referred to, the sensor camera slave unit is denoted by reference numeral 7. In addition, each device shown in each block has a unique communication address.

  The call terminal 1 is connected to the router 2 via the external communication network NT. The video / audio transfer terminal 3 is connected to the external communication network NT via the router 2. The intercom base unit 4 is connected to the video / audio transfer terminal 3.

  Interphone sub-master devices 51 to 5N are connected in cascade to interphone master device 4. Door phone slave unit 61 to door phone slave unit 6N are connected to intercom base unit 4, respectively. The sensor camera slave units 71 to 7N are connected to the door phone slave units 61 to 6N, respectively.

  The video / audio transfer terminal 3, the interphone master unit 4, the interphone sub-master unit 5, the door phone slave unit 6, and the sensor camera slave unit 7 communicate with each other using the communication protocol of the existing interphone to configure the existing interphone system. . This existing intercom system is installed in a house, for example.

  The call terminal 1, the router 2, and the video / audio transfer terminal 3 perform communication using, for example, a SIP (session initiation protocol) communication protocol.

  The call terminal 1 is configured by a communication device such as a mobile phone or an IP videophone, and is possessed by a user. The external communication network NT is configured by, for example, a mobile phone communication network or an IP phone communication network.

  The router 2 connects the existing intercom system to the external communication network NT. The video / audio transfer terminal 3 functions as a gateway between the communication protocol of the existing intercom system and SIP.

  The intercom base unit 4 is configured by an interphone with a display device installed in, for example, an indoor living room of a house. The interphone sub-master 5 is configured by an interphone with a display device installed in a room other than an indoor living room in a house, a hallway, or the like.

  The door phone slave unit 6 includes, for example, a call button, a camera, a microphone, and the like, and is configured by a camera-equipped door phone installed outdoors such as a house entrance.

  The sensor camera slave unit 7 is constituted by, for example, a camera, is installed at a house entrance, fence, building, etc., and monitors the outside of the house.

  FIG. 2 is a sequence diagram showing a call control method executed by the intercom system according to the first embodiment. FIG. 3 is a sequence diagram continued from FIG. FIG. 4 is a sequence diagram continued from FIG. This call control method mainly includes six steps of a first step SA to a sixth step SF. The SIP server 100 shown in FIGS. 2 to 8 is a server that exists in the external communication network NT and performs call control such as associating a telephone number with an IP address or calling and connecting a partner. . In the present embodiment, for example, when the SIP server 100 receives a packet addressed to the telephone number of the call terminal 1 from the video / audio transfer terminal 3, the SIP server 100 assigns an IP address previously associated with the telephone number of the call terminal 1. Determine and forward the received packet to this IP address.

  In the first step SA, the audio / video transfer terminal 3 establishes a call with the call terminal 1 and is a child that is one of the door phone slave units 61 to 6N and the sensor camera slave units 71 to 7N. This is processing for establishing a call path between the machine K1 (first slave) and the call terminal 1.

  In the second step SB, after the video / audio transfer terminal 3 establishes the communication path in the first step SA, the call terminal starts from the child device K2 (second child device) which is a child device different from the child device K1. 1 is a process of accepting a call request to 1. In addition, the subunit | mobile_unit K2 is any one subunit | mobile_unit among the door phone subunit | mobile_units 61-6N and the sensor camera subunit | mobile_units 71-7N, Comprising: It is a subunit | mobile_unit different from the subunit | mobile_unit K1.

  In the third step SC, when the video / audio transfer terminal 3 accepts the call request in the second step SB, the third step SC is a process of notifying the call terminal 1 that the call request is received from the slave unit K2.

  In the fourth step SD, the call terminal 1 notified of the call request from the handset K2 in the third step SC accepts a predetermined operation from the user, and the video / audio transfer terminal 3 receives a call request from the handset K2. This is a process for notifying that the operation has been performed.

  In the fifth step SE, the video / audio transfer terminal 3 that has received the notification in the fourth step SD does not disconnect the SIP call with the call terminal 1 and the call path between the handset K2 and the call terminal 1 is set. It is a process to establish.

  The sixth step SF is a process in which the call terminal 1 whose call path has been established in the fifth step SE accepts a predetermined operation from the user and notifies the video / audio transfer terminal 3.

  Hereinafter, the call control method including the first step SA to the sixth step SF will be specifically described.

  First, in step S <b> 1, the slave unit K <b> 1 transmits a slave unit call to the video / audio transfer terminal 3 via the intercom master unit 4 when the call button by the visitor is pressed. Next, the video / audio transfer terminal 3 receives a handset call from the handset K1 (step S2). Next, the video / audio transfer terminal 3 establishes a SIP call with the call terminal 1 (step S3).

  Call establishment is performed as follows. First, the video / audio transfer terminal 3 transmits INVITE + SDP (O) to the call terminal 1 via the SIP server 100. Next, the call terminal 1 transmits 100 Trying to the video / audio transfer terminal 3 via the SIP server 100.

  Next, the call terminal 1 transmits 180 Ringing to the video / audio transfer terminal 3 via the SIP server 100.

  Next, when the call button is pressed by the user, the call terminal 1 transmits 200 OK + SDP (A) to the video / audio transfer terminal 3 via the SIP server 100. Next, the video / audio transfer terminal 3 transmits ACK to the call terminal 1 via the SIP server 100. Thus, a call between the video / audio transfer terminal 3 and the call terminal 1 is established.

  Here, INVITE is a SIP message, and SDP (Session Description Protocol) is a protocol for notifying the INVITE message together with session and media information (video and audio codec information). SDP (O) is information on the inquiring side and SDP (A) is information on the answering side, and both parties agree on this inquiry, and video and audio signals are transmitted after the call is established.

  Next, the video / audio transfer terminal 3 starts transferring the video and audio signals from the handset K1 to the call terminal 1 (step S4). Here, the video / audio transfer terminal 3 converts the YUV video and YUV audio transmitted from the slave unit K1 into RTP (Real-time Transport Protocol) video and RTP audio and transfers them to the call terminal 1. Here, RTP is a transmission protocol for streaming reproduction of audio and video. The RTP video and RTP audio are video signals and audio signals compliant with RTP.

  Next, the call terminal 1 starts outputting the user's voice signal (step S5). Here, the call terminal 1 may acquire a user's voice signal with a microphone and generate RTP voice from the voice signal. Further, the call terminal 1 may transmit a video signal. In this case, the call terminal 1 may shoot a user with a camera and generate an RTP video from the obtained video signal.

  Next, the video / audio transfer terminal 3 transfers the RTP video and RTP audio from the handset K1 to the call terminal 1, but does not transfer the RTP sound from the call terminal 1 to the handset K1, that is, sets the call path to the child terminal. By confirming the unidirectional direction from the machine K1 to the call terminal 1, the other party is confirmed (step S6).

  For this reason, the visitor who calls the handset K1 cannot view the voice or the like of the user of the call terminal 1, but the user of the call terminal 1 can watch the sound or the like from the handset K1. Therefore, the user of the call terminal 1 can select whether or not to answer the call after confirming the call from the child device K1 according to the voice from the child device K1.

  Next, in step S7 shown in FIG. 3, when the user pushes a push button “*”, for example, the call terminal 1 generates a PB (push button) sound for notifying the video / audio transfer terminal 3 of the push button. The data is transmitted to the video / audio transfer terminal 3.

  The video / audio transfer terminal 3 detects DTMF (Dual Tone Multi-Frequency) from the received “*” push button PB sound (step S8). Thereby, the video / audio transfer terminal 3 can recognize that the user of the call terminal 1 answers the call from the handset K1. The call terminal 1 notifies the user by pressing the “*” push button, but the present invention is not limited to this, and other users can be pressed to notify the user. Also good.

  Next, the video / audio transfer terminal 3 transmits a slave unit call start request to the slave unit K1 via the interphone master unit 4 and receives a call start permission from the slave unit K1 via the interphone master unit 4. Then, a call is made (step S9).

  Thereby, a two-way communication path is established between the handset K1 and the call terminal 1, and the handset K1 and the call terminal 1 can communicate with each other. That is, since the communication path between the handset K1 and the call terminal 1 is bidirectional, the YUV video and YUV sound from the handset K1 are converted into RTP video and RTP sound by the video / audio transfer terminal 3, and the call terminal 1 Has been sent. Further, the RTP sound from the call terminal 1 is converted into YUV sound by the video / audio transfer terminal 3 and transmitted to the slave unit K1 via the intercom base unit 4.

  In the second step SB shown in FIG. 4, when the call button of the child device K2 is pressed by the visitor, the interphone parent device 4 transmits a child device call from the child device K2 to the video / audio transfer terminal 3.

  Next, the video / audio transfer terminal 3 transmits audio / video guidance to the call terminal 1 to notify the user of the call terminal 1 that the handset K2 has been called (third step SC). Here, as the voice guidance, a predetermined call sound indicating that there has been a call from the child device K2 can be adopted, and as the video guidance, the user performs the name of the child device K2 and what operation thereafter. It is possible to employ a guidance video for guiding the user.

  Next, the process of the fourth step SD is executed as follows. First, when the user pushes the “*” push button (step S 10), the call terminal 1 transmits a PB sound of “*” to the video / audio transfer terminal 3. Next, the video / audio transfer terminal 3 performs DTMF detection and detects that the push button of “*” is pressed by the user in the call terminal 1 (step S11).

  Thereby, the video / audio transfer terminal 3 recognizes that the user of the call terminal 1 answers the call from the handset K2.

  Next, the fifth step SE is executed as follows. First, the video / audio transfer terminal 3 transmits a disconnection request to the slave unit K1 via the interphone master unit 4, and receives a slave unit disconnection completion notification from the slave unit K1 via the interphone master unit 4 (step S12). . Next, the video / audio transfer terminal 3 receives the handset call from the handset K2 via the intercom base unit 4 (step S13).

  Through the above fifth step SE, the video / audio transfer terminal 3 switches the call path with the call terminal 1 from the slave unit K1 to the slave unit K2 without disconnecting the SIP call with the call terminal 1.

  Next, the video / audio transfer terminal 3 converts the YUV video and YUV audio from the slave unit K2 into RTP video and RTP audio, and transfers them to the call terminal 1 (step S14). Here, the video / audio transfer terminal 3 does not transfer the RTP audio from the call terminal 1 to the handset K2.

  That is, the video / audio transfer terminal 3 keeps the communication path between the handset K2 and the call terminal 1 unidirectional from the handset K2 to the call terminal 1 until the notification in the sixth step SF is received, Yes.

  For this reason, the visitor who calls the handset K2 cannot view the voice or the like of the user of the call terminal 1, but the user of the call terminal 1 can view the sound or the like from the handset K2. Therefore, the user of the call terminal 1 can select whether or not to answer the call after confirming the call from the child device K2 according to the voice from the child device K2.

  In step S14, when the video displayed on the display device is switched from the slave unit K1 to that of the slave unit K2 at the call terminal 1, a time lag may occur. Therefore, the video / audio transfer terminal 3 may transmit a video signal indicating information such as “camera video switching” to the call terminal 1 and cause the call terminal 1 to display the video signal. Thereby, the stress given to the user of the call terminal 1 before the video displayed on the display device of the call terminal 1 is switched from the handset K1 to that of the handset K2 can be reduced.

  Next, the process of the sixth step SF is executed as follows. First, when the user pushes the “*” push button (step S15), the call terminal 1 transmits an audio signal corresponding to the “*” push button to the video / audio transfer terminal 3.

  Next, the video / audio transfer terminal 3 performs DTMF detection and detects that the push button of “*” is pressed by the user in the call terminal 1 (step S16). Next, the video / audio transfer terminal 3 makes the communication path between the handset K2 and the call terminal 1 bidirectional (step S17). Thereby, the RTP sound from the call terminal 1 is converted into YUV sound and transmitted to the child device K2.

  Here, priorities may be set in advance in the slave units K1 and K2. If the priority of the child device K2 is higher than the priority of the child device K1, the video / audio transfer terminal 3 immediately executes the fifth step SE without receiving the notification in the fourth step SD, A call path between the child device K2 and the call terminal 1 may be established. For example, the information on the priority may be stored in the video / audio transfer terminal 3 in association with the communication addresses of the slave units K1 and K2.

  In this case, the third step SC and the fourth step SD are omitted. When the user of the call terminal 1 presses the “*” push button (step S15), the call path between the handset K2 and the call terminal 1 is bi-directional.

  If the priority of the slave unit K1 is higher than the priority of the slave unit K2, the video / audio transfer terminal 3 is connected to the communication path between the slave unit K1 and the call terminal 1 even if a call is received from the slave unit K2. The call may be continued as is.

  When the call terminal 1 calls the handset K1, the processing in the first step SA may be the one shown in FIG. 5 instead of FIG. 2 and FIG. FIG. 5 is a sequence diagram showing the process of the first step SA when the call terminal 1 calls the handset K1. In FIG. 5, the sensor camera slave unit 7 shown in FIG. 1 is assumed as the slave unit K1. That is, the process of FIG. 5 shows the process when the call terminal 1 monitors the video imaged by the sensor camera slave unit 7.

  First, when the user presses the call button on the call terminal 1 (step S51), the call terminal 1 transmits INVITE + SDP (O) to the video / audio transfer terminal 3. Next, the video / audio transfer terminal 3 transmits a slave unit call start request to the slave unit K <b> 1 via the intercom master unit 4, and transmits 100 Trying to the call terminal 1. Next, when accepting a call start permission from the slave unit K1 via the interphone master unit 4, the video / audio transfer terminal 3 transmits 180 Ringing / 200 OK + SDP (A) to the call terminal 1. Next, the call terminal 1 transmits ACK to the video / audio transfer terminal 3. Thereby, a communication path between the child device K1 and the call terminal 1 is established.

  In this case, the YUV video and YUV audio from the handset K1 are converted into RTP video and RTP audio by the video / audio transfer terminal 3 and transmitted to the call terminal 1, and the RTP video is displayed on the display unit of the call terminal 1, The sound is output from the speaker of the call terminal 1. Note that the video / audio transfer terminal 3 converts the RTP sound from the call terminal 1 into YUV sound and does not transmit it to the handset K1, and makes the call path unidirectional from the handset K1 to the call terminal 1. This is because the handset K1 is the sensor camera handset 7, and therefore it is not necessary to transmit the audio signal from the call terminal 1 to the handset K1 that is the sensor camera handset 7.

  In FIG. 5, the communication path between the call terminal 1 and the child device K1 which is the sensor camera slave device 7 is unidirectional from the child device K1 to the call terminal 1, but the present invention is not limited to this. That is, as shown in step S7 of FIG. 3, the call terminal 1 is triggered by an operation in which the user of the call terminal 1 presses a push button of “*”, for example, as in the case of calling the handset K1 which is the door phone handset 6. And the communication path between the sensor camera slave unit 7 may be bidirectional. Thereby, when the user of the call terminal 1 finds a suspicious person by monitoring the sensor camera slave unit 7 from the call terminal 1, the user can make an inquiry to the suspicious person by pressing the push button. become.

  5 has been described on the assumption that the slave unit K1 is the sensor camera slave unit 7, the slave unit K1 may be the door phone slave unit 6. In this case, a call from the call terminal 1 to the door phone slave unit 6 is requested.

  As described above, according to the intercom system according to the present embodiment, when a call request is made from the slave unit K2 after the call path between the slave unit K1 and the call terminal 1 is established, the video / audio transfer terminal 3 This is notified to the call terminal 1.

  Therefore, the user can know that the handset K2 has been called during a call with the handset K1, and can prevent the call to the handset K2 from being ignored.

  Further, when a call path between the call terminal 1 and the handset K1 is established, the handset K2 is called, and when the user of the call terminal 1 responds to the call, the video / audio transfer terminal 3 and the call terminal 1 The call path between the handset K2 and the call terminal 1 is established without being disconnected. Therefore, the user of the call terminal 1 can respond to the call of the handset K2 promptly.

(Embodiment 2)
In the intercom system according to the second embodiment, when there is a call from the handset K2 during a call between the handset K1 and the call terminal 1, the video / audio transfer terminal 3 disconnects the call with the call terminal 1, A call path between the machine K2 and the call terminal 1 is established. In the present embodiment, the same elements as those in the first embodiment are not described.

  FIG. 6 is a sequence diagram illustrating a call control method executed by the intercom system according to the second embodiment. FIG. 7 is a sequence diagram continued from FIG. Step S21 shown in FIG. 6 is the same as step S9 shown in FIG. That is, in the present embodiment, as in the first embodiment, the processing up to step S9 in FIG. 2 to FIG. 4 or the processing in FIG. 5 is executed, and the communication path between handset K1 and call terminal 1 is established. Is done.

  Next, as in the first embodiment, the second step SB and the third step SC are executed. In the fourth step SD, the “*” push button is pressed in the first embodiment, but the disconnect button is pressed in the second embodiment. That is, when responding to a call from handset K2, the user of call terminal 1 presses the disconnect button.

  Then, after disconnecting the call with the call terminal 1, the video / audio transfer terminal 3 establishes a call with the call terminal 1 again, and establishes a call path between the handset K2 and the call terminal 1. Execute SE.

  Specifically, when the disconnect button is pressed in the fourth step SD, the call terminal 1 transmits BYE to the video / audio transfer terminal 3 (step S22).

  When receiving the BYE, the video / audio transfer terminal 3 executes the fifth step SE. First, the video / audio transfer terminal 3 transmits a disconnection request to the child device K1 (step S23). Next, when receiving the notification of the completion of disconnection of the slave unit from the slave unit K1, the video / audio transfer terminal 3 transmits 200 OK to the call terminal 1 (step S24). After the SIP call between the video / audio transfer terminal 3 and the call terminal 1 is disconnected by the processing in steps S22 to S24, the call path between the handset K1 and the call terminal 1 is established.

  Next, the slave unit K2 transmits a slave unit call to the video / audio transfer terminal 3 (step S25). Next, the video / audio transfer terminal 3 establishes a SIP call with the call terminal 1 in the same manner as in step S3 (step S26).

  Steps S27 to S29 are the same as steps S4 to S6 in FIG. 3 except that the slave unit K1 is changed to the slave unit K2, and thus description thereof is omitted. In step S29, the communication path is unidirectional from the handset K2 to the call terminal 1 and is in a partner confirmation state. Therefore, the call terminal 1 can respond to this visitor after confirming the call of the handset K2.

  Thus, in the intercom system according to the present embodiment, when the communication path between call terminal 1 and handset K1 is established, when the second handset is called, the user of call terminal 1 is It is possible to respond to the call of the slave unit K2.

(Embodiment 3)
The intercom system according to the third embodiment is characterized in that, in the intercom system according to the first embodiment, when the call with the child device K2 is terminated, the call with the child device K1 is resumed.

  In the present embodiment, the same elements as those in the first embodiment are not described. FIG. 8 is a sequence diagram illustrating a call control method executed by the intercom system according to the third embodiment.

  First, in step S31, a communication path between the handset K2 and the communication terminal 1 is established. Here, as the process of step S31, the process of FIGS. 2 to 4 or the process of FIGS. 5 to 4 may be employed.

  Next, when the user pushes the “#” push button, the call terminal 1 transmits the PB sound “#” to the video / audio transfer terminal 3 (step S32).

  Next, the video / audio transfer terminal 3 performs DTMF detection and detects that the “#” push button is pressed by the user in the call terminal 1 (step S33).

  As a result, the video / audio transfer terminal 3 recognizes that the user of the call terminal 1 ends the answering of the call from the handset K2, and responds to the call from the handset K1.

  Hereinafter, the processes of steps S34 to S39 are the same as steps S12 to S17 shown in FIG. 4 except that the child device K1 is the child device K2 and the child device K2 is the child device K1. That is, in steps S34 to S35, the video / audio transfer terminal 3 switches the communication path from the slave unit K2 to the slave unit K1. Next, in step S36, the video / audio transfer terminal 3 sets the call path in a single direction from the handset K1 to the call terminal 1. Next, in steps S37 to S39, the video / audio transfer terminal 3 makes the communication path between the handset K1 and the call terminal 1 bidirectional.

  On the other hand, in step S32, when the user of the call terminal 1 presses the end button instead of the “#” push button, the video / audio transfer terminal 3 disconnects the SIP call with the call terminal 1 and What is necessary is just to cut | disconnect the communication path of K2 and the call terminal 1, and complete | finish the call with all the subunit | mobile_units.

  As described above, according to the intercom system according to the third embodiment, the user of the call terminal 1 can resume the call with the child device K1 when the answer to the call of the child device K2 is completed.

1 is an overall configuration diagram of an intercom system according to Embodiment 1. FIG. It is a sequence diagram which shows the call control method which the intercom system by Embodiment 1 performs. FIG. 3 is a sequence diagram continued from FIG. 2. FIG. 4 is a sequence diagram subsequent to FIG. 3. It is a sequence diagram which shows a process in case a call terminal calls a subunit | mobile_unit. FIG. 10 is a sequence diagram illustrating a call control method executed by the intercom system according to the second embodiment. FIG. 7 is a sequence diagram continued from FIG. 6. FIG. 10 is a sequence diagram illustrating a call control method executed by the intercom system according to Embodiment 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Call terminal 2 Router 3 Video / audio transfer terminal 4 Interphone main unit 5, 51-5N Interphone sub-main unit 6, 61-6N Door phone sub unit 7, 71-7N Sensor camera sub unit K1, K2

Claims (6)

A call of an interphone system comprising a plurality of slave units, a master unit connected to the plurality of slave units, a video / audio transfer terminal connected to the master unit, and a call terminal connected to the video / audio transfer terminal A control method,
The video / audio transfer terminal establishes a call by the SIP (session initiation protocol) with the call terminal, and establishes a call path between the first slave unit and the call terminal among the plurality of slave units. And the steps
A second step in which the video / audio transfer terminal accepts a call request from the second slave unit different from the first slave unit to the call terminal after the establishment of the call path in the first step;
A third step of notifying the call terminal that there is a call request from the second handset when the video / audio transfer terminal accepts the call request in the second step;
A fourth step in which a call terminal that is notified of a call request from the second slave unit in the third step receives a predetermined operation from the user and notifies the video / audio transfer terminal;
The video / audio transfer terminal that has received the notification in the fourth step disconnects the communication path with the first slave unit, and without disconnecting the SIP call with the call terminal, the second slave unit And a fifth step of establishing a call path with the call terminal ,
In the third step, the video / audio transfer terminal notifies the call terminal of video guidance including a name of the second slave unit and a guidance video for guiding a user of subsequent operations. A call control method. Priorities are set in advance for the first and second slave units,
When the priority of the second slave unit is higher than the priority of the first slave unit, the video / audio transfer terminal executes the fifth step without receiving the notification in the fourth step. The call control method according to claim 1. The call terminal having a call path established in the fifth step further includes a sixth step of receiving a predetermined operation from the user and notifying the video / audio transfer terminal,
Until the video / audio transfer terminal receives the notification in the sixth step, the communication path between the second slave unit and the call terminal is unidirectional from the second slave unit to the call terminal. The call control method according to claim 1 or 2, characterized by the above-mentioned.   The video / audio transfer terminal resumes a call with the first slave unit after a call path between the second slave unit and the call terminal is established in the fifth step. The call control method according to claim 1, wherein, when an operation for receiving is received, a call path between the first slave unit and the call terminal is established again.   The call control method according to claim 1, wherein the plurality of slave units include at least one of a door phone slave unit and a surveillance camera. An interphone system comprising a plurality of slave units, a master unit connected to the plurality of slave units, a video / audio transfer terminal connected to the master unit, and a call terminal connected to the video / audio transfer terminal. And
The video / audio transfer terminal includes:
A first means for establishing a SIP (session initiation protocol) call with the call terminal and establishing a call path between the first handset and the call terminal among the plurality of handset;
Second means for accepting a call request to the call terminal from a second handset different from the first handset after establishing the call path by the first means;
A third means for notifying the call terminal that a call request has been received from the second handset when receiving a call request by the second means;
A fourth terminal that receives a predetermined operation from the user and notifies the video / audio transfer terminal of the call terminal that has been notified of the call request from the second handset by the third means;
The video / audio transfer terminal that has received the notification by the fourth means disconnects the call path with the first slave unit and disconnects the SIP call with the call terminal without disconnecting the SIP call. And a fifth means for establishing a call path with the call terminal ,
The third means is that the video / audio transfer terminal notifies the call terminal of a video guidance including a name of the second slave unit and a guidance video for guiding a user of subsequent operations. Characteristic intercom system.

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