JP4174060B2 - COMMUNICATION CONTROL SYSTEM, COMMUNICATION CONTROL METHOD, AND PROGRAM - Google Patents

Description

  The present invention relates to an IP telephone system.

  In an IP (Internet Protocol) telephone system, an IP telephone, a PC (Personal Computer) having a microphone, a speaker, and the like are connected via a communication network such as the Internet by SIP (Session Initiation Protocol) and RTP (Real-time Transport Protocol). Thus, audio data and the like are transmitted to and received from other devices.

  In an IP telephone using SIP, two-way communication using voice data is generally used. The procedure for establishing the call is to exchange and negotiate codecs (G.711, G.729a, etc.) supported by each other by describing SDP (Session Description Protocol) in the body part of the INVITE request and its response. Based on offer / answer procedures.

  In addition, in an IP telephone based on SIP, not only voice data but also text data, image (moving image) data, AP (application program) data, and the like are communicated bidirectionally. In order to realize such bi-directional communication using multiple media, codec (H.261, H.263, etc.) by instant message by SIP MESSAGE request or by specifying media type (m = audio / video / control, etc.) ) Is described.

  For example, Patent Document 1 discloses a technique for establishing another session without using a server provided by a service provider by using signaling information of a session established through a server provided by the service provider. ing.

JP 2005-293065 A

  Here, a specific example of transmitting image data and AP data in addition to the voice data by the IP phone in the conventional IP phone system will be described. FIG. 18 is a diagram showing an outline of a conventional IP telephone terminal system. This system is, for example, a video conference telephone system. The IP telephone terminal system includes a communication device 1801, a communication device 1802, a SIP server 1803, a communication network 1804, and the like. The communication device 1801, the communication device 1802, the SIP server 1803, and the like are connected via a communication network 1804. The communication device 1801, the communication device 1802, and the like support SIP, RTP, and the like, and transmit and receive audio data, image data, AP data, and the like. The SIP server 1803 supports SIP, and establishes transactions such as with the communication device 1801 and the communication device 1802.

  Here, a plurality of types of media devices 1811 and the like are connected to each of the communication device 1801 and the communication device 1802. The media device 1811 inputs and outputs audio data, image data, AP data, and the like, and is, for example, a conventional IP phone, display, microphone, speaker, headphones, camera, or the like. Each of the communication device 1801 and the communication device 1802 transmits voice data, image data, AP data, etc. input from the media device 1811 by RTP, and receives the received voice data, image data, AP data, etc., to other media devices. 1811 is output.

  Note that each of the communication device 1801 and the media device 1811 and the communication device 1802 and the media device 1811 is referred to as a media terminal.

  Here, when transmitting and receiving audio data, image data, AP data, and the like as described above, each of the communication device 1801 and the communication device 1802 of the prior art is connected to each of all the media devices 1811 connected to itself. It is necessary to perform RTP control, device control, user interface control, and the like. The media device 1811 is, for example, an IP phone, a display, a microphone, a speaker, headphones, a camera, and the like as described above, and there are many types. Therefore, development man-hours, costs, and the like are required to develop the communication device 1801, the communication device 1802, and the like that perform RTP control, device control, user interface control, and the like for all such media devices 1811.

  The present invention has been made in view of such circumstances, and in an IP telephone terminal system, it is possible to reduce development man-hours, costs, etc. for developing a system for inputting / outputting data in real time to a plurality of input / output devices. The purpose is to provide the technology that enables it.

  The present invention has been made to achieve the above object. A media device that inputs and outputs data has a communication means, and a control terminal that controls the media device inputs data to be input and output to the media device. Receive connection information of the media device from another communication terminal that controls the output media device, transmit the received connection information to the media device controlled by the media device, and control the transmission / reception of data by the media device itself It is characterized by.

  The present invention also provides a first media terminal group having a plurality of types of media terminals having communication means for inputting / outputting media data and communicating with other devices, and control for controlling the first media terminal group When a first communication network including a terminal and a second media terminal group having a plurality of types of media terminals are connected and a request including media terminal type information is received, the same type of media terminal of the received type is received. Communication control in which a media terminal is selected from the second media terminal group, and a communication terminal that transmits connection information and type information of the selected media terminal in association with each other is connected via the second communication network. A management information storage unit, wherein the control terminal stores the identification information and the type information of the media terminals included in the first media terminal group in association with each other; Type transmitting means for transmitting a request including type information read from the management information storage means to the communication terminal, and the same type as the transmitted type information included in the second media terminal group from the communication terminal A receiving means for receiving connection information and type information of a media terminal, and a type of the media terminal to be connected to the received connection information from among the media terminals included in the first media terminal group. Connection information transmitting means for transmitting to the same type of media terminal, and the media terminal that has received the connection information transmits and receives media data to and from the communication terminal using the connection information. To do.

  According to the technology of the present invention, it is not necessary to mount an RTP control function for each of a plurality of types of media devices, a device control function, an interface function for controlling each media device, and the like in one apparatus. As a result, it is possible to reduce development man-hours, costs, etc. for developing a system for inputting / outputting data to / from a plurality of input / output devices in real time.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  First, an outline of the present embodiment described below will be described with reference to FIG.

  The system of this embodiment includes a communication network 9901, a communication device 9902, a SIP server 9903, a communication network 9904, and the like. The communication network 9901, the communication device 9902, and the SIP server 9903 are connected to each other via the communication network 9904. A control terminal 9911, a plurality of types of media terminals 9912, and the like are connected to the communication network 9901. Here, each media terminal 9912 has a communication function, an RTP function, a SIP function, and the like. In addition, a plurality of types of media devices 9922 are connected to the communication device 9902. The communication device 9902 and the media device 9922 are collectively referred to as a media terminal.

  The control terminal 9911 transmits the type information of the media terminal 9912 to the communication device 9902. Upon receiving this, the communication device 9902 selects a media device 9922 of the same type as the received type, and transmits connection information and the like for connecting to the selected media device 9922 to the control terminal 9911. The operation itself of the communication device 9902 is the same as that of the conventional SIP. The control terminal 9911 transmits this connection information to the media terminal 9912. The media terminal 9912 controls to directly communicate with the communication device 9902 without the control of the control terminal 9911 according to the received connection information.

  Thus, in this embodiment, the control terminal 9911 does not control transmission / reception of data input / output by the media terminal 9912, and each of the media terminals 9912 controls its own data transmission / reception. On the other hand, it is possible to reduce the development man-hours and costs for developing a device that performs RTP control, device control, user interface control, and the like.

Hereinafter, the system of this embodiment will be described in detail.
<First Embodiment>
First, the first embodiment will be described.

  A system configuration example of the first embodiment will be described with reference to FIG.

  In FIG. 2, the system of the present embodiment includes a network 1, a media terminal 2, a SIP (Session Initiation Protocol) server 3, and the like. The network 1, media terminal 2, etc. are connected via a communication network 4.

  The network 1 is a network composed of devices connected to each other by, for example, a local area network (LAN), a wide area network (WAN), wired, or wireless.

  The SIP server 3 is the same as the prior art, and establishes a transaction using SIP or the like.

  The communication network 4 is, for example, a LAN, a WAN, a dedicated line, the Internet, a public network, a mobile phone network, or the like.

  The network 1 includes devices such as a control terminal 11 and a plurality of types of media devices 12. The control terminal 11 and a plurality of types of media devices 12 are connected via a communication network 13.

  The media device 12 is not particularly limited as long as it has input / output of image data, audio data, AP data, and the like and has a communication function, a SIP function, an RTP function, and the like. Specifically, the media device 12 is, for example, an information processing device such as a PC, a mobile phone, a PHS (Personal Handyphone System), an IP phone, a TV media terminal, a camera, a speaker, a microphone, a display, or the like. Note that the TV media terminal here is a terminal used in, for example, a conventional TV phone, and has a display, a camera, and the like. The hardware configuration for realizing the communication function, the SIP function, and the RTP function of the media device 12 may be built in each media device 12, or the communication function of an external device such as a GW (gateway), the RTP A function or a SIP function may be used. A device having such a communication function, a SIP function, an RTP function, and the like is a conventional technique, and thus detailed description thereof is omitted.

  In the following description, when the media devices 12 are specifically distinguished, the media device 12 that does not have a communication function is referred to as a “media device 12-1”, and the media device 12 that has a communication function is referred to as a “media device”. It is referred to as “terminal 12-2”. Further, when the plurality of types of media devices 12 are particularly distinguished and described, for example, description is given with reference numerals such as “media device 12-1A” and “media terminal 12-2C”. As described above, in the present embodiment, whether or not the media device itself has a communication function is not a gist, and it is only necessary that the media device can communicate, so that “media device” and “media terminal” As a general term, “media equipment” is used.

  Devices such as the control terminal 11, the media terminal 12-2C, the media terminal 12-2D, and the media terminal 12-2E communicate by SIP. Accordingly, FIG. 2 shows that the control terminal 11, the media terminal 12-2C, the media terminal 12-2D, the media terminal 12-2E, and the like are physically connected by one communication network 13. The control terminal 11, the media terminal 12-2C, the media terminal 12-2D, etc. are connected by a LAN or the like, and the control terminal 11 and the media terminal 12-2E are connected via a mobile phone network or the like. It is also possible. A media device 12-1A, a media device 12-1B, and the like are connected to the control terminal 11.

  The control terminal 11 is an information processing apparatus such as a PC. The control terminal 11 makes a call request to a communication device 21 (to be described later) in the media terminal 2, transmits connection information of the media device 22 to be communicated to the media device 12, and the media device 12 and the media devices 22 communicate with each other. Control until communication. Details of the control terminal 11 will be described later.

  The media terminal 2 includes a communication device 21, a media device 22, and the like. The communication device 21 is an information processing device such as a PC, for example.

  A plurality of types of media devices 22 are connected to the communication device 21. As described above, the media device 22 is not particularly limited, and is, for example, a camera, a speaker, a microphone, a display, or the like. In the present embodiment, it is assumed that the media device 22 does not have a communication function. Therefore, although it is also described as “media device 22” in FIG. 2, this indicates the same device as the media device 22.

  The communication device 21 performs RTP control, device control, SIP control, and the like of each media device 22 and responds to a call request from the control terminal 11. Since this communication device 21 is the same as the IP telephone terminal system of the prior art, detailed description is omitted.

  In addition, the number of each apparatus which shows an example in FIG. 2 is not necessarily restricted to this. The number of devices constituting the system of the present embodiment is arbitrary.

  Next, a configuration example of the control terminal 11 will be described with reference to FIG.

  The control terminal 11 includes a CPU (Central Processing Unit) 111, a memory 112, a storage device 113, an input device 114, an output device 115, a communication interface 116, and the like. The CPU 111, the memory 112, the storage device 113, the input device 114, the output device 115, the communication interface 116, and the like are connected by a bus 117 and the like.

  The memory 112 stores a dialog table 161 and the like. The dialog table 161 stores information related to the currently usable media device 12.

  The storage device 113 is, for example, a storage medium such as a CD-R (Compact Disc-Recordable) or a DVD-RAM (Digital Versatile Disk-Random Access Memory), a drive device for the storage medium, an HDD (Hard Disk Drive), or the like. . The storage device 113 stores a program 171, a management table 172, and the like. The program 171 is a program for realizing functions to be described later. The management table 172 stores information related to the registered media device 12.

  The input device 114 is, for example, a keyboard or a mouse. The output device 115 is, for example, a display or a printer. The control terminal 11 is connected to the network 13 via the communication interface 116.

  The CPU 111 implements functions such as a management table creation unit 151, a dialog table creation unit 152, and a connection information notification unit 153 by executing the program 171.

  The management table creation unit 151 creates a management table 172. The dialog table creation unit 152 determines whether each of the media devices 12 read from the management table 172 is usable, and stores information on the usable media devices 12 in the dialog table 161. Further, the dialog table creation unit 152 transmits the type information and the like of the media device 12 in the dialog table 161 to the communication device 21. The connection information notification unit 153 transmits the connection information of the connection target media device 22 transmitted from the communication device 21 to the media device 12.

  Next, information in the memory 112 and the storage device 113 will be described in detail.

  First, an example of the dialog table 161 in the memory 112 will be described with reference to FIG.

  The dialog table 161 includes a dialog key 401, dialog information 402, and the like. Dialog key 401, dialog information 402, and the like are associated with each other.

  The dialog key 401 is identification information for communication with each device that has established a session in SIP. Here, the dialog key 401 in the dialog table 161 is identification information for communicating with the communication device 21 that has established a session. The dialog key itself is the same as the conventional SIP. The dialog information 402 is information related to a usable state among the media devices 12 controlled by the control terminal 11 when a session with the corresponding dialog key 401 is established.

  The dialog information 402 includes an item number 411, a media type 412, a payload type 413, a determination flag 414, and the like. The item number 411, the media type 412, the payload type 413, the determination flag 414, and the like are associated with each other.

  The item number 411 is a number uniquely assigned to the media device 12 controlled by the control terminal 11. In the example of FIG. 4, the item number 411 “1” indicates the media device 12-1A. The item number 411 “2” indicates the media device 12-1B. The item number 411 “3” indicates the media terminal 12-2C. The item number 411 “4” indicates the media terminal 12-2D. The item number 411 “5” indicates the media terminal 12-2E. The media type 412 indicates a data type that can be input / output by the media device 12 of the corresponding item number 411. The payload type 413 indicates the payload type of the media device 12 of the corresponding item number 411. The determination flag 414 indicates whether or not the media device 12 having the corresponding item number 411 is actually used. In the example of FIG. 4, the determination flag 414 “ON” indicates that it is actually used, and the determination flag 414 “OFF” indicates that it is not actually used.

  Note that the information such as the media type and payload type in the dialog table 161 is the same as that in the prior art.

  One dialog table 161 is created each time a call connection is made with the communication device 21. That is, when making a call connection with a plurality of communication devices 21, dialog tables 161 are created for the number of communication devices 21. Also, the dialog table 161 is discarded when the connection with the communication device 21 is disconnected.

  Information in the dialog table 161 is stored by an operation example described later.

  Next, an example of the management table 172 in the storage device 113 will be described with reference to FIG.

  The management table 172 includes an item number 501, a terminal position 502, a media type 503, a payload type 504, a codec 505, an attribute 506, a priority 507, a timer 508, a status flag 509, and the like. The item number 501, the terminal position 502, the media type 503, the payload type 504, the codec 505, the attribute 506, the priority 507, the timer 508, the status flag 509, and the like are associated with each other. The item number 501 is a number uniquely assigned to the media device 12 controlled by the control terminal 11. This item number 501 indicates the same media device 12 as the item number 411 of the dialog table 161 described above. The terminal location 502 is information indicating the location of the media device 12 of the corresponding item number 501 and is, for example, an IP address. In FIG. 5, the terminal position 502 “(null)” indicates that it is directly connected to the control terminal 11. The media type 503 indicates a data type that can be input / output by the media device 12 of the corresponding item number 501. The payload type 504 indicates the payload type of the media device 12 of the corresponding item number 501. A codec 505 indicates the codec of the media device 12 of the corresponding item number 501. An attribute 506 indicates the attribute of the codec 505 of the media device 12 of the corresponding item number 501. The priority order 507 indicates the use priority order when there are a plurality of media types 503, payload types 504, and codecs 505 that are the same as the media device 12 of the corresponding item number 501. In the example of FIG. 5, it is assumed that the priority 507 of the corresponding terminal position 502 “(null)”, that is, the media device 12 directly connected to the control terminal 11 is “0”. The timer 508 indicates a time limit for no response from the media device 12 of the corresponding item number 501. The status flag 509 indicates whether or not the media device 12 of the corresponding item number 501 is usable. In the example of FIG. 5, the status flag 509 “ON” indicates that it can be used, and the status flag 509 “OFF” indicates that it cannot be used.

  Note that the information itself such as the media type, payload type, codec, and attribute of the management table 172 is the same as that of the conventional technology.

  Of the information in the management table 172, at least information such as item number 501, terminal position 502, priority 507, timer 508, and the like is stored in advance. Information such as the media type 503, the payload type 504, the codec 505, and the attribute 506 is stored by an operation example described later. The information of the status flag 509 stores “OFF” as an initial value, and is updated to “ON” or the like by an operation example described later.

  Here, in order to acquire information such as the item number 501, terminal position 502, priority 507, timer 508, etc. in the management table 172, for example, the control terminal 11 can select either the output device 115 such as a display or the media device 12 Alternatively, the screen shown in FIG. 6 may be output to an output device (not shown) of another connected communication terminal. In FIG. 6, the user instructs to add, change, delete, etc. the item number 501, terminal position 502, priority 507, timer 508, etc. in the management table 172 by pressing a button 611 on the screen 601. To do. The device 11 adds, changes, deletes information such as the item number 501, the terminal position 502, the priority 507, the timer 508, and the like according to the instruction. Note that the priority 507 of the media device 12 directly connected to the control terminal 11 is assumed to store “0” as an initial value.

  Next, an operation example will be described. In the following, first, an operation example using the control terminal 11 alone will be described, and then a specific sequence example will be described.

  First, an example of the operation of the control terminal 11 alone that stores information such as the media type 503, payload type 504, codec 505, attribute 506, and status flag 509 in the management table 172 will be described with reference to FIG. This operation example is activated when the user inputs an outgoing event instruction by using any of the media devices 12 or the input device 14 or the like, for example. When this instruction is input, the control terminal 11 issues a transmission event. This operation example is the same as in the prior art. At this time, it is assumed that communication between the control terminal 11 and the media device 12 has already been established.

  When a transmission event is issued (S701), the management table creation unit 151 selects one of the media devices 12 controlled by the management table creation unit 151 (S702). Specifically, for example, the management table creation unit 151 selects one item number 501 from the management table 172 in descending order or the like. Next, the management table creation unit 151 determines whether or not information related to the media device 12 selected in S702 is stored in the management table 172 (S703). For this purpose, the management table creation unit 151 determines whether, for example, the media type 503, the payload type 504, the codec 505, and the like corresponding to the item number 501 selected in S702 are stored in the management table 172.

  As a result of the determination in S703, if the information related to the media device 12 selected in S702 is stored in the management table 172, the management table creation unit 151 creates an offer SDP (S704). In this SDP, “a = recvonly”, which means holding, is described. The process for creating such an offer SDP is the same as in the prior art.

  As a result of the determination in S703, when the information regarding the media device 12 selected in S702 is not stored in the management table 172, or after the processing in S704 described above, the management table creation unit 151 selects the media device 12 selected in S702. "INVITE" is transmitted to (S705). For this purpose, for example, the management table creation unit 151 reads the terminal position 502 corresponding to the item number 501 selected in S702 from the management table 172, and transmits “INVITE” to the media device 12 at the read terminal position 502. At this time, when the process of S704 is performed, the management table creation unit 151 transmits “INVITE” including the offer SDP created in the process of S704.

  The media device 12 that has received “INVITE” transmits a response to INVITE by the conventional SIP. This process is the same as in the prior art.

  The management table creation unit 151 determines whether it is a reception timeout (S706). Therefore, the management table creation unit 151 reads the timer 508 corresponding to the item number 501 selected in S702 from the management table 172, transmits “INVITE” by the process of S705 described above, and then reads the timer 508 of the read timer 508. It is determined whether or not a response is received in time.

  As a result of the determination in S706, if a response is received without a reception timeout, the management table creation unit 151 determines whether the received response indicates success (S707). Therefore, the management table creation unit 151 determines whether the received final response code is in the 200s, for example. This determination process is the same as the conventional SIP.

  As a result of the determination in S707, if the received response indicates success, the management table creation unit 151 stores information on the media device 12 included in the received response in the management table 172 (S708). Specifically, for example, the received response includes information such as the media type, payload type, codec, and attribute of the media device 12 selected in S702. Accordingly, the management table creating unit 151 sets the media type, payload type, codec, attribute, and the like extracted from the received response to the media type 503, payload type 504, and the like corresponding to the item number 501 selected in S702 of the management table 172. Stored in the codec 505, the attribute 506, and the like.

  Further, the management table creation unit 151 updates the status information of the media device 12 selected in S702 in the management table 172 (S709). Specifically, for example, the management table creation unit 151 sets the status flag 509 corresponding to the item number 501 selected in S702 of the management table 172 to “ON”.

  The management table creation unit 151 determines whether an offer SDP has been created in the process of S704 described above (S710). This determination may be arbitrary. For example, when the process of S704 described above is performed, a flag indicating that the process has been performed is set, and the determination may be performed by referring to the flag.

  As a result of the determination in S710, if the offer SDP has not been created in the above-described processing of S704, the management table creation unit 151 creates an answer SDP for the SDP included in the received response (S711).

  As a result of the determination in S710, when the offer SDP has been created in the above-described processing of S704, or after the above-described processing in S711, the management table creation unit 151 sends “ACK” to the media device 12 selected in S702. Transmit (S712). Here, when the answer SDP is created in the process of S711 described above, the answer SDP is also transmitted. This operation example is the same as the conventional SIP.

  On the other hand, if the received response does not indicate success as a result of the determination in S707 described above, the management table creation unit 151 initializes a part of the information related to the media device 12 selected in S702 in the management table 172 ( S713), the status information of the media device 12 selected in S702 in the management table 172 is updated (S714), and the process of S715 described later is performed. Specifically, for example, the management table creation unit 151 deletes information such as the media type 503, payload type 504, codec 505, and attribute 506 corresponding to the item number 501 selected in S702 in the management table 172. Furthermore, the management table creation unit 151 sets the status flag 509 corresponding to the item number 501 selected in S702 of the management table 172 to “OFF”. As described above, in this case, when the initial state of the state flag 509 is “OFF”, the management table creation unit 151 does not change the state flag 509 corresponding to the item number 501 selected in S702. Also good.

  If it is determined in S706 that a reception timeout has occurred, the management table creation unit 151 performs the processing of S714 described later after performing the processing of S714 described above.

  The management table creation unit 151 determines whether there is an unselected media device 12 (S715).

  As a result of the determination in S715, when there is an unselected media device 12, the management table creation unit 151 performs the process in S702 again, and selects one of the unselected media devices 12.

  If the result of determination in S <b> 715 is that there is no unselected media device 12, processing by the management table creation unit 151 is terminated, and processing proceeds to processing by the dialog table creation unit 152. An example of this operation will be described later.

  Here, a sequence example according to the operation example of the control terminal 11 described with reference to FIG. 7 will be described.

  First, an example of a sequence for acquiring information such as a media type, a payload type, a codec, and an attribute from the media device 12 will be described with reference to FIG. Here, a sequence example in the case where the management table creation unit 151 selects “media terminal 12-2C” in the processing of S702 described above will be described. An example of the management table 172 at this time is shown in FIG. As described above, here, the item number 501 “3” of the management table 172 indicates the media terminal 12-2C. That is, here, it is assumed that information such as the media type, payload type, codec, and attribute of the media terminal 12-2C is not stored in the management table 172 at the start of the processing described below.

  In FIG. 8A, the management table creation unit 151 of the control terminal 11 transmits “INVITE” to the media terminal 12-2C (S801). This process corresponds to S705 described above. As described above, since information such as the media type 503, payload type 504, and codec 505 corresponding to the item number 501 is not stored in the management table 172, the management table creation unit 151 transmits the INVITE transmitted here. Does not include SDP.

  The media terminal 12-2C reads the media type, payload type, codec, attribute, etc. from its own storage device (not shown) and transmits the read information as SDP (S802). Processing such as creation and transmission of SDP by the media terminal 12-2C is the same as in the prior art. Here, an example of information included in the SDP transmitted from the media terminal 12-2C is shown in a message 811 in FIG.

  In FIG. 8A, the management table creation unit 151 of the control terminal 11 extracts the media type, payload type, codec, attribute, and the like from the received information and stores them in the management table 172. This operation example is the same as S708 described above. An example of the table updated by this operation example is shown in FIG. The management table 172 shown as an example in FIG. 9B stores a media type 503, a payload type 504, and a codec 505 corresponding to the item number 501 “3”. The attribute 506 is left blank because it is not included in the information from the media terminal 12-2C.

  In FIG. 8A, the management table creation unit 151 transmits “ACK” to the media terminal 12-2C (S803). This process corresponds to S712 described above. Here, since SDP is not included in the INVITE transmitted in S801, the management table creating unit 151 creates an answer SDP and sends an ACK including the answer SDP to the media terminal 12-2C. In this SDP, “a = recvonly”, which means holding, is described. The process for creating such an answer SDP is the same as in the prior art. Here, an example of information included in the answer SDP transmitted by the control terminal 11 is shown in a message 812 in FIG.

  Note that the media device 12 that has received the SDP including “a = recvonly” indicating the hold stands by until the next instruction or the like is input.

  Next, a sequence example when the response transmitted from the media device 12 does not indicate success in the determination of S707 described above will be described with reference to FIG. Here, a sequence example when the management table creation unit 151 selects “media terminal 12-2D” in the processing of S702 described above will be described. An example of the management table 172 at this time is shown in FIG. As described above, the item number 501 “4” in the management table 172 indicates the media terminal 12-2D. Therefore, it is assumed here that information such as the media type, payload type, and codec of the media terminal 12-2D is stored in the management table 172 at the start of the processing described below.

  In FIG. 10A, the management table creation unit 151 of the control terminal 11 transmits “INVITE” to the media terminal 12-2D (S1001). This process corresponds to S705 described above. Here, as described above, since the management table 172 stores information such as the media type 503, payload type 504, codec 505, etc. corresponding to the item number 501, the management table creation unit 151 transmits the information here. To the INVITE to be transmitted including the SDP created in S704 described above. Here, an example of information included in the SDP transmitted by the control terminal 11 is shown in a message 1011 in FIG.

  In FIG. 10A, the media terminal 12-2D transmits an error response by detecting some abnormality (S1002). Specifically, for example, the media terminal 12-2D transmits 400 or more response codes corresponding to the cause of the error. This processing example is the same as the conventional SIP.

  The management table creation unit 151 of the control terminal 11 determines that the response from the media terminal 12-2D is an error based on the determination in S707 described above. In this case, the management table creation unit 151 updates the information of the media terminal 12-2D in the management table 172. This operation example is the same as described above. An example of the table updated by this operation example is shown in FIG. In the management table 172 shown as an example in FIG. 11B, information such as the media type 503, the payload type 504, the codec 505, etc. corresponding to the item number 501 “4” is deleted and is blank.

  Next, an example of the operation of the control terminal 11 alone that shifts after the processing described with reference to FIG. 7 will be described with reference to FIG.

  The dialog table creation unit 152 initializes the dialog table 161 (S1201). Specifically, for example, the dialog table creation unit 152 creates a dialog key that is identification information for communicating with the communication device 21. The operation example for creating this dialog key is the same as that of the conventional SIP. Next, the dialog table creation unit 152 stores the dialog key in the dialog table 161 (S1202). Specifically, for example, the dialog table creation unit 152 stores the dialog key created in the above-described processing of S1201 as the dialog key 401 of the dialog table 161.

  The dialog table creation unit 152 selects one of the media devices 12 to be controlled (S1203). For this purpose, the dialog table creation unit 152 selects one item number 501 from the management table 172 in descending order or the like.

  The dialog table creation unit 152 determines whether or not the media device 12 selected in S1203 is in a usable state (S1204). Therefore, the dialog table creation unit 152 refers to the management table 172 and determines whether or not the status flag 509 corresponding to the item number 501 selected in S1203 is “ON”.

  As a result of the determination in S1204, when the media device 12 selected in S1203 is in a usable state, the dialog table creation unit 152 sets the media type and payload type of each media device 12 already stored in the dialog table 161. It is determined whether or not the combination includes the same combination as the media type and payload type of the media device 12 selected in S1203 (S1205). For this purpose, for example, the dialog table creation unit 152 first reads the media type 503 and the payload type 504 corresponding to the item number 501 selected in S1203 from the management table 172. Next, the dialog table creation unit 152 sequentially reads the media type 412 and payload type 413 corresponding to each other in the dialog table 161, and whether the media type 503 and payload type 504 match the media type 412 and payload type 413. Judge whether or not.

  In the following description, among the media devices 12 already stored in the dialog table 161 in the determination in S1205, the combination of the media type and the payload type is the media type of the media device 12 selected in S1203. The same payload type is called a duplicate media terminal.

  If the duplicate media terminal is not stored in the dialog table 161 as a result of the determination in S1205, the dialog table creation unit 152 stores information on the media device 12 selected in S1203 in the dialog table 161 (S1206). Specifically, for example, the dialog table creation unit 152 reads the media type 503, the payload type 504, and the like corresponding to the item number 501 selected in S1203 from the management table 172, and this item number 501, media type 503, payload The type 504 and the like are stored as the item number 411, media type 412 and payload type 413 of the dialog table 161. Further, the dialog table creation unit 152 stores “OFF” in the determination flag 414 corresponding to the item number 411 stored here.

  As a result of the determination in S1205, when the duplicate media terminal is stored in the dialog table 161, the dialog table creation unit 152 determines whether or not the priority order of the media device 12 selected in S1203 is higher than the priority order of the duplicate media terminal. Determination is made (S1207). For this purpose, the dialog table creation unit 152 reads the item number 411 of the duplicate media terminal from the dialog table 161. Next, the dialog table creation unit 152 from the management table 172, the priority order 507 corresponding to the item number 501 selected in S1203, and the priority corresponding to the item number 501 that matches the item number 411 read in the above processing example. The rank 507 is read out. The dialog table creation unit 152 determines whether or not the priority order 507 corresponding to the item number 501 selected in S1203 has priority over the priority order 507 corresponding to the item number 501 of the duplicate media terminal. In the example of the dialog table 161 in FIG. 4, the dialog table creation unit 152 determines whether the priority 507 corresponding to the item number 501 selected in S1203 is lower than the priority 507 corresponding to the item number 501 of the duplicate media terminal. To determine.

  If the priority of the media device 12 selected in S1203 is higher than the priority of the duplicate media terminal as a result of the determination in S1207, the dialog table creation unit 152 selects information on the duplicate media terminal in the dialog table 161 in S1203. It replaces with the information regarding the media device 12 that has been made (S1208). Specifically, for example, the dialog table creation unit 152 deletes the duplicate media terminal item number 411, the media type 412, the payload type 413, the determination flag 414, and the like in the dialog table 161. Further, the dialog table creation unit 152 reads the media type 503, the payload type 504, and the like corresponding to the item number 501 selected in S1203 from the management table 172, and reads the item number 501, the media type 503, the payload type 504, and the like. The item number 411, media type 412, and payload type 413 of the dialog table 161 are used. Further, the dialog table creation unit 152 stores “OFF” in the determination flag 414 corresponding to the item number 411 stored here.

  Next, the dialog table creation unit 152 transmits “BYE” to the duplicate media terminal, and disconnects the connection (S1209). Specifically, for example, the dialog table creation unit 152 reads the terminal position 502 corresponding to the item number 501 of the duplicate media terminal from the management table 172, and transmits “BYE” with the read terminal position 502 as a destination or the like. To do. This process is the same as the conventional SIP.

  With this operation example, it is possible to set only one of the media devices 12 having the same media type and payload type as the media device 12 that is actually used.

  On the other hand, when the priority of the media device 12 selected in S1203 is lower than the priority of the duplicate media terminal in the determination in S1207 described above, the dialog table creation unit 152 transmits “BYE” to the media terminal selected in S1203. Then, the connection is disconnected (S1210). Since this specific example is the same as described above, a description thereof will be omitted. This process is the same as the conventional SIP.

  As a result of the determination in S1204, if the media device 12 selected in S1203 is not usable, or after the processing in S1206, S1209, and S1210 described above, the dialog table creation unit 152 has an unselected media device 12 It is determined whether or not (S1211).

  If there is an unselected media device 12 as a result of the determination in S1211, the dialog table creation unit 152 performs the above-described processing in S1203 again, and selects one of the unselected media devices 12.

  If there is no unselected media device 12 as a result of the determination in S1211, the dialog table creation unit 152 sorts the dialog table 161 by the media type 412 (S1212), and creates an SDP (S1213). Here, the SDP created by the dialog table creation unit 152 is for notifying the controllable media device 12 of the control terminal 11. An example of the SDP created here is shown in FIG. In FIG. 13, a message 1301 is created from information in the dialog table 161 shown as an example in FIG. The message 1301 includes the terminal position, media type, payload type, codec, attribute, and the like of each media device 12 indicated by the item number 401 included in the dialog table 161. The dialog table creation unit 152 reads all the item numbers 411 from the dialog table 161. Next, the dialog table creation unit 152 from the management table 172, the terminal position 502, the media type 503, the payload type 504, the codec 505, the attribute 506, and the like associated with the item number 501 that matches each item number 411 read out. Is read. The dialog table creation unit 152 creates a message 1301 by combining the dialog key 401 in the dialog table 161 and the read information.

  The dialog table creation unit 152 transmits “INVITE” including the SDP created in S1213 to the communication device 21 (S1214). Thereby, the process by the dialog table creation unit 152 is terminated, and the process proceeds to the process by the connection information notification unit 153.

  Here, an operation example of the communication apparatus 21 when “INVITE” transmitted by the process of S1214 is received will be described. The operation example of the communication device 21 is the same as that of the conventional SIP.

  When “INVITE” including SDP is received by the process of S1214 described above, the communication device 21 selects a media device 22 that communicates media data among the media devices 22 controlled by the communication device 21, and displays information regarding the selected media device 22. Then, it is transmitted to the communication device 21 as a response to the received INVITE. More specifically, when receiving “INVITE” including SDP, the communication device 21 extracts the terminal position, media type, payload type, codec, attribute, and the like of each media device 12 from the received SDP. The communication device 21 reads the media type, payload type, codec, attribute, and the like of each media device 22 that it controls from a storage device (not shown) or the like. The communication device 21 compares the media type, payload type, codec, attribute, and the like of each media device 22 with the media type, payload type, codec, attribute, etc. of the media device 12, and compares the media type, payload type, codec, and the like. It is determined whether or not the attributes match. The communication device 21 reads connection information for communicating with the media device 22 determined to match from the storage device, associates the previously read media type, payload type, codec, attribute, and the like with the connection information, Include in answer SDP. The communication device 21 transmits this answer SDP or the like as a response to the control terminal 11. The connection information is, for example, the port number of the port where the media device 22 is connected to the control terminal 11, the IP address of the control terminal 11, and the like.

  Note that if any abnormality is detected, the communication device 21 transmits a predetermined response code indicating an error. This operation example is also the same as the prior art.

  Next, an example of the operation of the control terminal 11 alone that shifts after the processing described with reference to FIG. 12 will be described with reference to FIG.

  The connection information notification unit 153 determines whether it is a reception timeout (S1401). Therefore, the connection information notification unit 153 determines whether or not to receive a response within a predetermined time after transmitting “INVITE” by the process of S1214 described above.

  As a result of the determination in S1401, when the response is received without receiving timeout, the connection information notification unit 153 determines whether the received response indicates success (S1402). For this purpose, the connection information notification unit 153 determines whether the received final response code is in the 200s, for example. This determination process is the same as the conventional SIP.

  As a result of the determination in S1402, if the received response indicates success, the connection information notification unit 153 analyzes the SDP included in the received response (S1403), and the communication target media device 22 transmitted by the communication device 21. Extract information about. Specifically, for example, the connection information notification unit 153 extracts connection information, media type, payload type, codec, attribute, and the like for each media device 22 from the answer SDP.

  Next, the connection information notification unit 153 selects one media device 12 from the dialog table 161 (S1404). For this purpose, the connection information notification unit 153 selects one item number 411 from the dialog table 161 in descending order or the like.

  Next, the connection information notification unit 153 determines whether or not the connection information of the type of media device 22 that matches the type of the media device 12 selected in S1404 is valid (S1405). For this purpose, for example, the connection information notification unit 153 reads the media type 412 corresponding to the item number 411 selected in S1404 from the dialog table 161. Next, the connection information notification unit 153 selects a media type that matches the read media type 412 from the combination of connection information, media type, payload type, codec, attribute, and the like for each media device 22 extracted by the above-described processing. Select a combination to include. Hereinafter, among the media devices 22 included in the SDP received in the above process, the media device 22 having the same media type as the media type of the media device 12 selected in S1404 is referred to as a communication target media device 22. The connection information notification unit 153 determines whether or not the connection information included in the selected combination is “0”. As described above, since the connection information for each media device 22 includes, for example, a port number, a port number of “0” indicates that the connection information is invalid.

  If the connection information is valid as a result of the determination in S1405, the connection information notification unit 153 determines that another media device 12 of the same type as the media device 12 of the media device 12 selected in S1404 has already been transmitted. It is determined whether or not the device 22 is to be connected (S1406). Therefore, the connection information notification unit 153 determines whether or not the dialog table 161 includes an item number 411 associated with the media type 412 that matches the media type 412 corresponding to each item number 411 selected in S1404. . As a result of this determination, if there is a corresponding item number 411, the connection information notification unit 153 refers to the dialog table 161 and determines whether or not the determination flag 414 associated with the corresponding item number 411 is “ON”. judge. If the determination flag 414 is “ON” as a result of this determination, the connection information notification unit 153 determines that the other media device 12 has already been connected to the communication target media device 22.

  As a result of the determination in S1406, if the other media device 12 is not yet connected to the communication target media device 22, the connection information notification unit 153 indicates that the media device 12 selected in S1404 is displayed in the dialog table 161. Information indicating communication with the media device 22 is stored (S1407). Specifically, for example, the connection information notification unit 153 changes the determination flag 414 corresponding to the item number 411 selected in S1404 of the dialog table 161 to “ON”.

  Next, the connection information notification unit 153 transmits “Re-INVITE” to the media device 12 selected in S1404 (S1408). Here, the connection information notifying unit 153 transmits the connection information, media type, payload type, codec, attribute, and the like of the communication target media device 22 included in this “Re-INVITE”. Here, when the media device 12 selected in S1404 is controlled by the control terminal 11 itself, the connection information notification unit 153 stores information for connecting to the communication target media device 22 in the memory 112 or the like. It is also possible to store the data in a predetermined area and perform the processing of S1413 described later without performing the processing of S1408 to S1410.

  The media device 12 that has received “Re-INVITE” transmits a response to the “Re-INVITE”. This operation example is the same as the conventional SIP.

  When the connection information notification unit 153 receives a response indicating success (S1409), the connection information notification unit 153 transmits an ACK to the media device 12 selected in S1404 (S1410). This operation example is the same as the conventional SIP.

  On the other hand, as a result of the determination in S1405 described above, when valid connection information is not included, the connection information notification unit 153 establishes connection to each of all the media devices 12 of the same type as the media device 12 selected in 1404. Cutting is performed (S1411), and a process of S1413 described later is performed. Specifically, for example, the media type 412 corresponding to the item number 411 selected in S1404 is read from the dialog table 161. Next, the connection information notification unit 153 reads all of the item numbers 411 associated with the media type 412 that matches the read media type 412 from the dialog table 161. The connection information notification unit 153 reads the position information 502 associated with the item number 501 that matches the read item number 411 from the management table 172. The dialog table creation unit 152 transmits “BYE” with the read position information 502 as a destination. The operation itself of transmitting this “BYE” is the same as the conventional SIP.

  Here, as a result of the determination in S1405 described above, when valid connection information is not included, and the media device 12 selected in S1404 is controlled by the control terminal 11 itself, a connection is established. The information notification unit 153 may perform the process of S1413, which will be described later, without performing the process of S1411 described above on the media device 12 controlled by the control terminal 11 itself.

  If the other media device 12 is already connected to the media device 22 in the determination of S1406 described above, the connection information notification unit 153 establishes a connection to the media device 12 selected in 1404. Cutting is performed (S1412), and the processing of S1413 described later is performed. Since this operation example is the same as described above, a description thereof will be omitted.

  After the processing of S1410, S1411, and S1412 described above, the connection information notification unit 153 determines whether there is an unselected control terminal 11 in the dialog table 161 (S1413).

  As a result of the determination in S1413, if there is an unselected one, the connection information notifying unit 153 performs the above-described processing of S1404 again and selects one of the unselected control terminals 11.

  As a result of the determination in S1413, if there is no unselected one, the connection information notification unit 153 transmits “ACK” to the communication device 21 (S1414). This operation example is the same as the conventional SIP.

  On the other hand, if the result of the determination in S1401 is a reception timeout or the result of the determination in S1402 indicates that the received response does not indicate success, the connection information notification unit 153 connects to all the media devices 12. Is cut (S1415). This operation example is the same as described above.

  The media device 12 that has received “Re-INVITE” in the processing of S1408 described above, or the media device 12 for which the determination flag 414 of the dialog table 161 is “ON” includes the connection information and media included in the “Re-INVITE”. Communication with the media device 22 is performed using the type, payload type, codec, attribute, or the like, or connection information, media type, payload type, codec, attribute, etc. in a predetermined area of the memory 112. This operation example is the same as that of the conventional RTP.

  Here, a sequence example according to the operation example of the control terminal 11 described with reference to FIGS. 12 and 14 will be described with reference to FIG.

  In FIG. 15A, the dialog table creation unit 152 transmits “INVITE” to the communication device 21 (S1501). This operation corresponds to S1214 described above. In response to this “INVITE”, the communication device 21 transmits a response including connection information, media type, payload type, codec, attribute, and the like of the media device 22 to be communicated by the same operation as the above-described conventional technology (S1502). An example of information included in this response is shown in a message 1511 in FIG. As shown in the message 1511, the response includes connection information, media type, payload type, codec, attribute, and the like of the media device 22 that communicates. The example of the message 1511 includes connection information, payload type, codec, attribute, and the like of the media device 22 having the media types “audio” and “video”. In the example of the message 1511, it is assumed that invalid connection information is not included.

  When the response including the message 1511 is received, the connection information notification unit 153 of the control terminal 11 performs the operation described with reference to FIG. Here, it is assumed that the connection information notification unit 153 first selects “media device 12-1A” in the processing of S1404. As shown in FIG. 4 and FIG. 5 as an example, the media type of “media device 12-1A” is “audio”. As described above, the response from the communication device 21 does not include invalid connection information, and the media device 12 having the media type “audio” is not selected in the processing of S1404. The determination flags 414 corresponding to the media type “audio” 161 are all “OFF”. And the payload type matches the response coming from the communication device 21. Therefore, the connection information notification unit 153 sets the determination flag 414 corresponding to the item number 411 “1” of the dialog table 161 to “ON”. Since the item number 411 “1” selected here is the media device 12 controlled by itself, the connection information notification unit 153 stores the connection information and the like of the communication target media device 22 in a predetermined area of the memory 112. The processing of S1404 is performed again without transmitting “Re-INVITE”.

  It is assumed that the connection information notifying unit 153 selects “media device 12-1B” in the next processing of S1404. As shown in FIG. 4 and FIG. 5 as an example, the media type of “media device 12-1B” is “audio”. In the above-described processing, in the dialog table 161, the determination flag 414 corresponding to the item number 411 “1” having the same media type “audio” is “ON”. Accordingly, the connection information notifying unit 153 determines that there is a duplicate media terminal in the determination of S1405 described above, ends the process regarding the selected “media device 12-1B”, and performs the process of S1404 again.

  It is assumed that the connection information notification unit 153 has selected “media terminal 12-2C” in the next processing of S1404. The media type of “media terminal 12-2C” is “audio”. As a result of the above-described operation, the determination flag 414 corresponding to the media type “audio” in the dialog table 161 is included as “ON”. Accordingly, the connection information notification unit 153 transmits “BYE” to the media terminal 12-2C (S1503). This operation corresponds to S1412 described above. The connection information notification unit 153 transmits “BYE” to the media terminal 12-2D by the same operation.

  It is assumed that the connection information notification unit 153 has selected “media terminal 12-2E” in the next processing of S1404. The media type of “media device 12-1B” is “video”. As described above, the response from the communication device 21 does not include invalid connection information, and the media device 12 having the media type “video” is not selected in the processing of S1404. The determination flags 414 corresponding to the media type “video” 161 are all “OFF”. And the payload type matches the response coming from the communication device 21. Therefore, the connection information notification unit 153 sets the determination flag 414 corresponding to the item number 411 “5” of the dialog table 161 to “ON”. An example of the dialog table 161 at this time is shown in FIG. In FIG. 16, in the dialog table 161, the determination flag 414 corresponding to the item number 411 “1” and the item number 411 “5” is “ON”, and the other determination flags 414 are “OFF”. .

  In FIG. 15A, the connection information notification unit 153 transmits “Re-INVITE” to the media terminal 12-2E (S1504). This operation corresponds to S1408 described above.

  The media terminal 12-2E transmits a response to the “Re-INVITE” (S1505). The connection information notification unit 153 transmits an ACK to the response to the media terminal 12-2E (S1506). Furthermore, the connection information notification unit 153 transmits an ACK to the communication device 21 (S1507). This operation corresponds to S1410 and S1414 described above.

  The control terminal 11 reads the connection information, media type, payload type, codec, attribute, and the like of the communication target media device 22 from a predetermined area of the memory 112, and using these information, the media device 12-1A 21 is connected by RTP, and is controlled to transmit and receive data in real time. Further, the media terminal 12-2E extracts the connection information, media type, payload type, codec, attribute, and the like of the communication target media device 22 from the received “Re-INVITE”, and uses these information to media terminal 12 -2E is connected to the communication device 21 by RTP and controls to send and receive data in real time.

  According to the above-described embodiment, the control terminal can realize a virtual IP telephone terminal in which a plurality of existing media terminals are integrated.

  As a development merit, by using the existing media device 12 as one device, it is not necessary to install the equivalent function on the own terminal side. In addition, by using the SIP provided in each terminal as the control means, it is possible to reduce the man-hours for mounting the control function.

As an advantage on the user side, the operation interface of the terminal already used can be inherited and used as part of a multimedia tool.
<Second Embodiment>
Next, a second embodiment will be described.

  The second embodiment is different from the system configuration of the first embodiment described above. In the first embodiment, the device of the network 1 has the control terminal 11 of the present embodiment. In the second embodiment described below, the control terminal 11 is provided in both the network 1 and the network 2.

  An example of the system configuration of the second embodiment is shown in FIG. In FIG. 17, a device in the network 2 that responds to a call request has the same control terminal 11 as the network 1 in FIG. The control terminal 11 of the network 1 and the control terminal 11 of the network 2 shown in FIG. 17 are the same as the control terminal 11 shown in FIG.

  In the first embodiment described above, the media device 12 of the network 1 is connected to the communication device 21. In the system illustrated in FIG. 17, the media device 12 (media terminal 12-2) of the network 1 is connected to the media device 12 (media terminal 12-2) of the network 2. The operation example in this case is the same as described above, and the control device 11 transmits connection information and the like to the media device 12 controlled by the control device 11, and the media device 12 controls the connection using the information.

  In addition, the number of each apparatus which shows an example in FIG. 17 is not necessarily restricted to this. The number of devices constituting the system of the present embodiment is arbitrary.

  In the first embodiment described above, call connection can be requested only from one side. As in the system configuration example of the second embodiment, the devices in the network 2 that respond to the call request have the same control terminal 11 as the network 1 in FIG. It becomes.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included. .

  For example, in the above-described embodiment, the communication partner device that responds to the call connection is a conventional IP telephone or the control terminal of the present embodiment, but is not limited thereto. The communication partner device that accepts the call connection may be any device as long as it has a SIP function or the like.

It is a figure explaining the outline | summary of one Embodiment of this invention. 1 illustrates an example of a system configuration of a first embodiment. In the embodiment, a configuration example of a control terminal is shown. In the embodiment, an example of a dialog table is shown. In the embodiment, an example of a management table is shown. In the embodiment, an example of a screen for registering initial settings of a management table is shown. FIG. 10 is a diagram illustrating an operation example for creating a management table in the embodiment. FIG. 10 is a diagram illustrating an operation example for creating a management table in the embodiment. FIG. 10 is a diagram illustrating an operation example for creating a management table in the embodiment. FIG. 10 is a diagram illustrating an operation example for creating a management table in the embodiment. FIG. 10 is a diagram illustrating an operation example for creating a management table in the embodiment. In the embodiment, an operation example for creating a dialog table is shown. In the embodiment, an example of a message is shown. In the embodiment, it is a figure explaining the operation example which transmits the information for connecting with a communication object terminal to a media terminal. In the embodiment, it is a figure explaining the operation example which transmits the information for connecting with a communication object terminal to a media terminal. In the embodiment, it is a figure explaining the operation example which transmits the information for connecting with a communication object terminal to a media terminal. It is a figure which shows the system configuration example of 2nd Embodiment. It is a figure for demonstrating a prior art.

Explanation of symbols

1: network, 2: network, 3: SIP server, 4: communication network, 11: control terminal, 12: media device, 13: communication network, 21: communication terminal, 22: media device, 111: CPU, 112: memory 113: Storage device 114: Input device 115: Output device 116: Communication interface 117: Bus 151: Management table creation unit 152: Dialog table creation unit 153: Connection information notification unit 161: Dialog table 171: Program, 172: Management table

Claims (5)

A first media device group including a plurality of types of media devices having communication means for inputting / outputting media data and communicating with other devices; and a control terminal that controls the first media device group. Communication network,
When a second media device group having a plurality of types of media devices is connected and a request including media device type information is received, a media device of the same type as the received media device type is received from the second media device group. A media terminal that selects and transmits the connection information and type information of the selected media device in association with each other, is a communication control system connected via a second communication network,
The control terminal is
Management information storage means for storing identification information of media devices included in the first media device group , type information , priority, response time limit, and status flag in association with each other ;
Inquiries are made to the media devices included in the first media device group, and if there is a response within the response time limit associated with the identification information of the media device that has made the inquiry, the media device The status flag is updated to a flag indicating a usable status, and if no response is received within the response time limit, the status flag of the media device is updated to a flag indicating an unusable status. Management information update means;
The identification information and type information of the media device associated with the status flag indicating the usable state are acquired for each media device from the management information storage unit, and the media device whose acquired type information matches is acquired. In other cases, the media device type information with the highest priority is stored in a predetermined memory, and all media devices with the highest priority among media devices with the same type information are stored. If there is no other media device whose type information matches, dialog information creating means for storing the acquired type information in the memory as it is,
Type transmission means for transmitting a request including type information stored in the memory from the management information storage means to the media terminal;
Receiving means for receiving connection information and type information of the same type of media device as the transmitted type information included in the second media device group from the media terminal;
Connection information transmitting means for transmitting the received connection information to a media device of the same type as the media device connected by the received connection information among the media devices included in the first media device group; Have
A communication control system, wherein a media device that receives the connection information transmits / receives media data to / from the media terminal based on the connection information. A first media device group having a plurality of media devices having communication means for inputting / outputting media data and communicating with other devices, and a first control terminal for controlling the first media device group A first communication network including:
When a second media device group having a plurality of types of media devices and a request including media device type information are received, a media device of the same type as the received media device type is selected from the second media device group. A communication control system in which a third communication network including a second control terminal that transmits the connection information and type information of the selected media device in association with each other is connected via the second communication network. There,
The first control terminal is
Management information storage means for storing identification information of media devices included in the first media device group , type information , priority, response time limit, and status flag in association with each other ;
Inquiries are made to the media devices included in the first media device group, and if there is a response within the response time limit associated with the identification information of the media device that has made the inquiry, the media device The status flag is updated to a flag indicating a usable status, and if no response is received within the response time limit, the status flag of the media device is updated to a flag indicating an unusable status. Management information update means;
The identification information and type information of the media device associated with the status flag indicating the usable state are acquired for each media device from the management information storage unit, and the media device whose acquired type information matches is acquired. In other cases, the media device type information with the highest priority is stored in a predetermined memory, and all media devices with the highest priority among media devices with the same type information are stored. If there is no other media device whose type information matches, dialog information creating means for storing the acquired type information in the memory as it is,
Type transmission means for transmitting a request including the type information stored in the memory from the management information storage means to the second control terminal;
Receiving means for receiving connection information and type information of the same type of media device as the transmitted type information included in the second media device group from the second control terminal;
Connection information transmitting means for transmitting the received connection information to a media device of the same type as the media device connected by the received connection information among the media devices included in the first media device group; Have
The communication control system, wherein the media device that has received the connection information transmits / receives media data to / from the selected media device based on the connection information. The communication control system according to claim 1 or 2,
The control terminal is
Type information requesting means for requesting the media device to transmit type information;
Type information receiving means for receiving type information transmitted from the media device;
Type information registration means for storing the received type information in the type information storage means;
The communication control system further comprising: A first media device group including a plurality of types of media devices having communication means for inputting / outputting media data and communicating with other devices; and a control terminal that controls the first media device group. Communication network,
When a second media device group having a plurality of types of media devices is connected and a request including media device type information is received, a media device of the same type as the received media device type is received from the second media device group. A communication control method by a communication control system in which a media terminal that selects and transmits connection information and type information of the selected media device in association with each other is connected via a second communication network,
The control terminal having management information storage means for storing identification information of media devices included in the first media device group , type information , priority, response time limit, and status flag in association with each other But,
Inquiries are made to the media devices included in the first media device group, and if there is a response within the response time limit associated with the identification information of the media device that has made the inquiry, the media device The status flag is updated to a flag indicating a usable status, and if no response is received within the response time limit, the status flag of the media device is updated to a flag indicating an unusable status. A management information update step;
The identification information and type information of the media device associated with the status flag indicating the usable state are acquired for each media device from the management information storage unit, and the media device whose acquired type information matches is acquired. In other cases, the media device type information with the highest priority is stored in a predetermined memory, and all media devices with the highest priority among media devices with the same type information are stored. If there is no other media device whose type information matches, a dialog information creation step for storing the acquired type information in the memory as it is,
A type transmission step of transmitting a request including the type information stored in the memory from the management information storage means to the media terminal;
Receiving from the media terminal connection information and type information of the same type of media device as the transmitted type information included in the second media device group;
A connection information transmission step of transmitting the received connection information to a media device of the same type as the media device connected by the received connection information among the media devices included in the first media device group; Have
A communication control method, wherein a media device that receives the connection information transmits / receives media data to / from the media terminal based on the connection information. A first media device group including a plurality of types of media devices having communication means for inputting / outputting media data and communicating with other devices; and a control terminal that controls the first media device group. Communication network,
When a second media device group having a plurality of types of media devices is connected and a request including media device type information is received, a media device of the same type as the received media device type is received from the second media device group. A media terminal that selects and transmits the connection information and type information of the selected media device in association with each other, and is a program executable by the communication control system connected via the second communication network,
The control terminal having management information storage means for storing identification information of media devices included in the first media device group , type information , priority, response time limit, and status flag in association with each other In addition,
Inquiries are made to the media devices included in the first media device group, and if there is a response within the response time limit associated with the identification information of the media device that has made the inquiry, the media device The status flag is updated to a flag indicating a usable status, and if no response is received within the response time limit, the status flag of the media device is updated to a flag indicating an unusable status. A management information update step;
The identification information and type information of the media device associated with the status flag indicating the usable state are acquired for each media device from the management information storage unit, and the media device whose acquired type information matches is acquired. In other cases, the media device type information with the highest priority is stored in a predetermined memory, and all media devices with the highest priority among media devices with the same type information are stored. If there is no other media device whose type information matches, a dialog information creation step for storing the acquired type information in the memory as it is,
A type transmission step of transmitting a request including the type information stored in the memory from the management information storage means to the communication terminal;
A receiving step of receiving connection information and type information of the same type of media device as the transmitted type information included in the second media device group from the communication terminal;
By transmitting the received connection information to a media device of the same type as the media device connected by the received connection information among the media devices included in the first media device group, the connection information A connection information transmission step of causing a media device that has received the message to transmit / receive media data to / from the media terminal based on the connection information.

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