JP4480698B2 - COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, AND COMMUNICATION CONTROL PROGRAM - Google Patents

Description

  The present invention relates to a communication control device, a communication control method, and a communication control program for controlling communication between SIP terminals compliant with SIP (Session Initiation Protocol).

  SIP (Session Initiation Protocol) is a protocol for establishing a point-to-point session prior to communication in an IP (Internet Protocol) communication network. Requested session establishment.

  For this reason, in a conventional communication control device using SIP (hereinafter referred to as SIP communication control device), even when establishing a session between SIP telephones in a LAN, the originating SIP telephone designates one destination. The session was established from point to point. That is, there is an inconvenience that it is not possible to make a simultaneous call to a plurality of SIP telephones in an extension call between SIP telephones under the LAN.

  On the other hand, a conventional SIP communication control device is connected to a WAN (Wide Area Network) as part of the function of a VoIP (Voice over IP) router and relays a SIP server in the WAN to establish a session. Yes.

  Such a SIP communication control device can, when there is a session establishment request from the WAN side, make incoming calls to a plurality of SIP telephones on the LAN side at the same time. A method may be considered in which a session establishment request is transmitted from a SIP telephone to its own WAN address via a SIP server, and a plurality of SIP telephones in the LAN are collectively called. Such a method will be described with reference to FIG.

  As shown in FIG. 7, the conventional SIP communication control device 70 is connected to the SIP telephones a, ˜i,... And the WAN network 95, and is connected to the SIP telephones a, ˜i,.・ Establishing a session between. When the SIP telephone a makes a simultaneous incoming call to the SIP telephones e, f, and g, the SIP telephone a connected to the LAN side of the SIP communication control device 70 is connected to the SIP server 90 via the WAN network 95. Send a session establishment request to its own WAN address. In response to this request, the SIP server 90 makes an incoming call to the WAN address designated by the source (in this case, the same as the WAN address of the source). Since the SIP communication control device 70 is set in advance so as to make an incoming call to the SIP telephones e, f, and g in response to an incoming call from the WAN network 95, as a result, the SIP telephone set a to the SIP telephones e, f and All incoming calls can be made to g.

  In addition, when a plurality of SIP telephones are grouped in advance and an incoming call is made to the address of a representative SIP telephone of each group, a SIP server is set so that all SIP telephones belonging to that group are called. Patent Document 1 discloses a method that can execute a simultaneous incoming call request.

JP 2006-33517 A

  However, according to the method described in Patent Document 1, when there is an incoming call request to a representative SIP phone in the group, the incoming call is always made to all SIP phones in the group, and the incoming call cannot be made only to the representative SIP phone. There was an inconvenience. In addition, the method described in Patent Document 1 and the conventional SIP communication control device shown in FIG. 7 have a disadvantage that a call charge is generated through the WAN because it has to go through the SIP server. . Further, in the conventional SIP communication control device shown in FIG. 7, there are some telephone operators that do not permit outgoing calls to their WAN addresses, and such operators cannot adopt the above-described method. was there.

  Accordingly, the present invention provides a communication control device, a communication control method, and a communication control program that improve the disadvantages of the above-described prior art and enable simultaneous incoming calls between SIP terminals connected to a LAN without generating a call charge. Its purpose is to provide.

In order to achieve the above object, a communication control apparatus according to the present invention is a communication control apparatus that is connected to a plurality of SIP terminals that use SIP as a communication control protocol through a local communication network, and groups the plurality of SIP terminals. and was the applied to the group identification information to each group and group information storage unit that stores in association with address information of SIP terminal belonging to the group, one of reference the SIP terminal information in the group information storage unit and destination information determination means that the destination information to determine whether there in the group identification information included in the origination terminal or Ranose cushion initiation request is, if the destination information is determined to be the group identification information A destination identification unit for reading out address information of the SIP terminal corresponding to the group identification information from the group information storage unit; A paging means for transmitting the read address data the session start request to all, the paging means and said source terminal and destination terminal is a previous SIP terminal which has transmitted a session start request "To:" header tag information in a SIP message that relays SIP messages exchanged between them and transmits / receives "To:" header tag information in a SIP message transmitted to the source terminal to / from the destination terminal Means for setting a value different from that of the destination terminal, and stores “To:” header tag information included in the SIP message transmitted / received between the destination terminal and the address information of the corresponding destination terminal, and stores the outgoing call The “To:” header tag information included in the SIP message transmitted / received to / from the source terminal is used as the source terminal. A tag information storage unit that stores the address information in association with the address information, and when receiving a SIP message from each of the SIP terminals, the tag information storage unit is referred to, based on the “To:” header tag information included in the SIP message. A message recognition means for recognizing which SIP terminal the SIP message is for establishing a session with, and when an OK message for the session start request is received from one of the destination terminals; Call interruption means for transmitting a cancel message for interrupting the session start request to the address information of all destination terminals other than the originator of the OK message .

  According to such a communication control apparatus, when a session start request for a SIP terminal belonging to a group is received, the group is specified by the destination information determining means, and the address information of the SIP terminals belonging to the group is specified by the destination specifying means. Is read, and a session start request is transmitted for all address information by the simultaneous calling means. Therefore, simultaneous incoming calls can be executed between SIP terminals connected to the LAN.

  In addition, since a session is established within the LAN without going through the WAN, it is possible to suppress the occurrence of call charges.

  In this way, tag information in a SIP message transmitted / received between the communication control device and each SIP terminal can be managed individually for each SIP terminal, and even when a session start request is transmitted to a plurality of SIP terminals. It is possible to recognize which terminal the SIP message is for establishing a session with.

  In this way, when a session is established between one destination SIP terminal and the source SIP terminal that have received all of the incoming calls, the call interruption means terminates the request with the other destination SIP terminal. Therefore, it is possible to suppress useless processing that occurs with other SIP terminals.

Next, according to the communication control method of the present invention, group identification information of each group obtained by grouping a plurality of SIP terminals connected via a local area communication network and address information of SIP terminals belonging to the group are stored in association with each other. A communication control method by a communication control device having a group information storage unit, a request reception step of receiving a session start request from a source terminal which is one of the plurality of SIP terminals, and the received session start A destination information determination step of determining whether or not the destination information included in the request is group identification information of a group obtained by dividing the plurality of SIP terminals into several parts with reference to information stored in the group information storage unit ; When the destination information is determined to be group identification information, S belonging to the group indicated by the group identification information A destination specifying step for the P terminal identifies with reference to the information stored in the group information storage unit, the paging process of transmitting the session start request to all SIP terminal that is this particular starting the session A response receiving process for receiving a response message to the request from the called terminal that is the SIP terminal to which the request has been sent, and the “To:” header tag information in the response message is read to correspond to the identification information of the called terminal A tag information storing step to be added and stored, a response transmitting step of changing the value of the “To:” header tag information in the response message to a different value and transmitting the value to the source terminal, and a “ To: “Associating header tag information with identification information of the source terminal Tag information storing step for storing sender, and when an OK message for the session start request is received from one of the receiver terminals, the session start request is interrupted for all receiver terminals other than the sender of the OK message And a call interruption step of transmitting a cancel message for performing the above.

  According to such a communication control method, simultaneous incoming calls between SIP terminals connected to the LAN can be executed by processing in the LAN without going through the WAN, and the generation of call charges can be suppressed.

  In this way, even if a session start request is transmitted to a plurality of SIP terminals, it is possible to manage which terminal the SIP message is for establishing a session with.

  In this way, when a session is established between one of the destination SIP terminals and the source SIP terminal of the incoming calls, the request between the other destination SIP terminals is terminated. It is possible to suppress useless processing that occurs with the destination SIP terminal.

Next, the communication control program according to the present invention includes a LAN interface unit that communicates with a plurality of SIP terminals that perform communication using SIP via a local communication network , and a group of the plurality of SIP terminals. Sent from a source terminal, which is one of the SIP terminals, to a computer mounted on a communication control device having a storage unit that stores group identification information and address information of SIP terminals belonging to the group in association with each other. Destination information determination processing for determining whether the destination information included in the received session start request is group identification information with reference to the information stored in the group information storage unit, and the destination information is group identification information. If it is determined that there is a SIP terminal address information corresponding to the determined group identification information, the group information A destination specifying process of reading from憶部, a paging process of sending the session start request to all the read address data is the previous SIP terminal which has transmitted a session start request in the paging process In a SIP message that relays a SIP message transmitted / received between a destination terminal and the source terminal and transmits / receives “To:” header tag information in the SIP message transmitted to the source terminal to / from the destination terminal Corresponding to the address information of the corresponding receiving terminal, the “To:” header tag information included in the SIP message transmitted / received to / from the receiving terminal. And the “To” included in the SIP message transmitted / received to / from the source terminal. "Tag information storage processing for storing header tag information in the storage unit in association with address information of the source terminal, and an address corresponding to" To: "header tag information included in the SIP message sent from each SIP terminal A message recognition process for identifying information from the information in the storage unit and recognizing which SIP terminal the SIP message is for establishing a session with, and from one of the receiving side terminals to the session start request A call interruption process for transmitting a cancel message for interrupting the session start request to all address information of the receiving terminal other than the originator of the OK message when an OK message is received. It is characterized by that.

  According to such a communication control program, simultaneous incoming calls between SIP terminals connected to the LAN can be executed by processing in the LAN without going through the WAN, and generation of call charges can be suppressed.

  In this way, tag information in a SIP message transmitted / received to / from each SIP terminal can be individually managed for each SIP terminal, and even when a session start request is transmitted to a plurality of SIP terminals, It is possible to recognize which terminal is a message for session establishment.

  In this way, when a session is established between one of the destination SIP terminals and the source SIP terminal of the incoming calls, the request between the other destination SIP terminals is terminated. It is possible to suppress useless processing that occurs with the destination SIP terminal.

  Since the present invention is configured and functions as described above, this allows the SIP telephone to execute a point-to-multipoint simultaneous transmission operation on a predetermined group of SIP telephones in the LAN.

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

<First Embodiment>
FIG. 1 is a block diagram showing the configuration of the first embodiment according to the present invention.

  As shown in FIG. 1, in the first embodiment, a LAN (private communication network) and a WAN in which a plurality of SIP telephones (SIP terminals) 2a to 2i using SIP (Session Initiation Protocol) as a communication control protocol are installed. A SIP communication control device 1 is connected to the network 3.

  The SIP communication control device 1 divides a plurality of SIP telephones 2a to 2i into several groups, and stores group identification information assigned to each group and address information of SIP terminals belonging to the group in association with each other. Information storage unit 10, WAN interface unit 11, SIP termination unit 12 that performs analysis and transmission / reception of a SIP message transmitted from or addressed to any one of SIP telephones 2a to 2i, and a LAN interface unit 13.

  The group information storage unit 10 includes a ROM, a RAM, a hard disk device, and the like, and includes a group address list 103 and a tag information storage area 104.

  The group address list 103 obtains a telephone SIP URI, which is address information of a SIP telephone belonging to this group, from a group SIP URI (Session Initiation Protocol Uniform Resource Identifier) which is identification information (address information) assigned to the group of SIP telephones. This is a list for identification. As shown in FIG. 2, a group SIP URI and a telephone SIP URI are recorded in association with each other.

  The tag information storage area 104 stores tag information described in the “To:” header of the header part in the SIP message transmitted / received to / from the SIP terminal in association with the telephone SIP URI of the SIP terminal. It is an area as a storage unit. This “To:” tag information is included in the response message transmitted from the SIP telephone that has received the request message. In SIP, a relationship between a sender and a receiver identified by a combination of a “Call-ID” header, “To:” tag information, and “From” tag information in a message is called a dialog. The dialog is established by a response (2xx or the like) to the session start request “INVITE”. The tag information is information for identifying each session establishment request when there are a plurality of session establishment requests, and the same tag information is used from the start to the end of the session.

  The SIP termination unit 12 performs a function of a session layer (layer 5) in OSI (Open System Interconnection), and includes a destination information determination unit 12a and a session establishment / stop unit 12b as shown in FIG. Yes.

  The destination information determination unit 12a in the SIP termination unit 12 refers to the group address list 103 stored in the group information storage unit 10, and the destination SIP URI (destination information) described in the input request message is a group. It has a function of determining whether or not it is a group SIP URI registered in the address list 103.

When the destination information determination unit 12a determines that the destination SIP URI described in the request message is a group SIP URI, the group SIP SIP
The telephone SIP URI corresponding to the URI is read from the group address list 103 and has a function as a destination identification unit for outputting to the session establishment / stop unit 12b.

Further, the destination information discriminating means 12a receives the destination SIP described in the request message.
When it is determined that the URI is not a group address, the destination SIP URI described in the request message is output as it is to the session establishment / stop unit 12b as a telephone SIP URI.

  The session establishment / stop unit 12b in the SIP termination unit 12 has a function as a general call unit that outputs a request message having the telephone SIP URI input from the destination information determination unit 12a as the destination SIP URI to the LAN interface unit 13. is doing.

  In addition, the session establishment / stop unit 12b transmits the “To:” tag information included in the SIP message transmitted / received to / from the terminating terminal that is the SIP terminal to which the request message has been transmitted, to the telephone SIP URI of the terminating terminal. The tag information is written in the tag information storage area 104 and the “To:” tag information included in the SIP message transmitted / received to / from the source terminal of the request message is associated with the telephone SIP URI of the source terminal. The tag information storage area 104 has a function of writing.

  When the session establishment / stop unit 12b receives the SIP message from the SIP terminal, the session establishment / stop unit 12b refers to the tag information storage unit and based on the “To:” tag information included in the SIP message, the session with which SIP terminal the SIP message is It has a function as message recognition means for recognizing whether it is a SIP message for establishment.

  Here, the session establishment / stop unit 12b receives the response message having the same content from each of the plurality of SIP telephones that simultaneously receive the call, but receives the telephone URI of the request source corresponding to only the response message received first. It functions to output a response message with the destination SIP URI to the LAN interface unit 13.

  Further, when the session establishment / stop unit 12b receives an OK message issued from one of the called terminals that is the SIP terminal to which the session start request is transmitted, the session establishment / stop unit 12b sends another cancel message for interrupting the session start request. It has a function as a call interruption means for adding the telephone SIP URI (address information) of all terminals on the receiving side as a destination SIP URI and outputting it to the LAN interface unit 13.

  The LAN interface unit 13 mainly has the functions of layer 1 (physical layer), layer 2 (data link layer), layer 3 (network layer), and layer 4 (transport layer) of the OSI reference model. ˜2i and the SIP termination unit 12 have a function of transmitting and receiving SIP messages.

  Next, the overall operation of the first embodiment will be described. Here, the communication control method according to the present invention is also shown and described.

  FIG. 5 is a sequence diagram showing the operation of the entire system when a session start request is transmitted from the SIP telephone 2a to the group consisting of the SIP telephones 2e, 2f, and 2g.

  First, a session start request “INVITE” in which “sip: 0501234568@sample.com” is described as a destination SIP URI is transmitted from the SIP telephone 2a (FIG. 4: step S1). In the SIP communication control device 1, when the “INVITE” message is received by the LAN interface 13, the “INVITE” message is output to the SIP termination unit 12 (request receiving step).

  In the SIP termination unit 12 of the SIP communication control device 1, the destination information determination unit 12 a reads “sip: 0501234568@sample.com”, which is the destination SIP URI of the “INVITE” message, from the destination SIP URI. Then, the process of specifying the group identification information assigned to this SIP URI is performed.

  That is, the destination information determination unit 12a refers to the group address list 103 (FIG. 2) in the group information storage unit 10 and determines whether “sip: 0501234568@sample.com” is a group address (FIG. 2). 4: Step S2, destination information discrimination step).

  Here, the request reception process and the destination information determination process described above may be configured to be programmed and executed by a computer that controls the SIP communication control device 1 as a request reception process and a destination information determination process.

Thereafter, the destination information discriminating means 12a makes the destination SIP of the “INVITE” message.
If it is determined that the URI is a group address, this destination SIP URI is identified as a group SIP URI, and the telephone SIP URI corresponding to this group SIP URI is “sip: 0501234551@sampl.com”, “sip: “0501234552@sampl.com” and “sip: 0501234553@sampl.com” are read from the group address list 103 (FIG. 2) (FIG. 4: Step S3, destination identification process).

  “Sip: 0501234551@sampl.com”, “sip: 0501234552@sampl.com”, and “sip: 0501234553@sampl.com” at this time are SIP URIs assigned to the SIP telephones 2e, 2f, and 2g, respectively.

  Then, all the telephone SIP URIs read by the destination information determination unit 12a are output to the session establishment / stop unit 12b.

  In the session establishment / stop unit 12 b, when telephone SIP URIs are sequentially input from the destination information determination unit 12 a, an “INVITE” message with the telephone SIP URI as the destination SIP URI is output to the LAN interface unit 13. Then, an “INVITE” message is transmitted from the LAN interface unit 13 to each of the SIP telephones 2e, 2f, 2g (FIG. 4: steps S4, S5, S6, simultaneous call process).

  Here, the contents of the destination identification process and the general call process described above may be programmed and executed by a computer that controls the SIP communication control apparatus 1 as the destination identification process and the general call process.

  Thereafter, when the SIP communication control device 1 receives a response message “180 Ringing” transmitted from the SIP telephone 2f and indicating that the call is in progress (FIG. 4: step S7, response reception process), the SIP communication control device 1 The session establishing / stopping means 12b in the SIP terminating unit 12 reads the tag information “B” in the “To:” header described in the “180 Ringing” message, and the tag information “B” is group information. It is stored in the tag information storage area 104 of the storage unit 10 in association with the telephone SIP URI of the SIP telephone 2f (tag information storage step). Here, the destination SIP URI of the “180 Ringing” message is the SIP URI “sip: 05012345447@sampl.com” of the SIP telephone 2a.

  Subsequently, in the session establishment / stop unit 12b in the SIP termination unit 12 of the SIP communication control device 1, “α” is the “To:” header as tag information not stored in the tag information storage area 104 of the group information storage unit 10. Is sent to the SIP telephone 2a via the LAN interface unit 13 (FIG. 4: step S8, response transmission step). Thereafter, the tag information “α” is stored in the tag information storage area 104 in association with the telephone SIP URI of the SIP telephone 2a (source tag information storage step).

  Subsequently, when “180 Ringing” messages from the SIP telephones 2e and 2g are sequentially received by the SIP communication control device 1 (FIG. 4: Steps S9 and S10, response reception process), the session establishment / reaction of the SIP communication control device 1 is performed. The stop means 12b reads the tag information “A” and “C” of the “To:” header described in these “180 Ringing” messages, and the tag information “A” and the tag information “C” are the tags. It is stored in the information storage area 104 in association with the telephone SIP URIs of the SIP telephones 2e and 2g, respectively (tag information storage process). At this time, the “180 Ringing” message corresponding to the “180 Ringing” message received from the SIP telephones 2e and 2g is not transmitted to the SIP telephone 2a.

  Here, the tag information storage process and the sender tag information storage process described above may be configured to be programmed and executed by a computer that controls the SIP communication control device 1 as a tag information storage process.

Thereafter, when a response message “200 OK” indicating that the request has been processed normally is transmitted from the SIP telephone 2e and received by the SIP communication control device 1 (FIG. 4: step S11), the session of the SIP communication control device 1 is performed. The tag information “A” in the “To:” header described in the “200 OK” message is read by the establishment / stop unit 12b, and the tag information “A” is stored in the tag information storage area 104. It is confirmed whether or not. If it is confirmed that the tag information “A” is stored in the tag information storage area 104, it is confirmed that the received “200 OK” message is used when establishing a session with the SIP telephone 2e. . This “200 OK” message contains the destination SIP.
As the URI, the SIP URI “sip: 0501234547@sampl.com” of the SIP telephone 2a is described.

  Subsequently, the session establishment / stop unit 12b transmits a “200 OK” message to the request-originating SIP telephone 2a via the LAN interface unit 13 (FIG. 4: step S12). In this “200 OK” message, “α” is described as tag information of the “To:” header.

Thereafter, when “200 OK” messages from the SIP telephones 2f and 2g are sequentially received by the SIP communication control device 1 (FIG. 4: steps S13 and S14), the session establishment / stop means 12b of the SIP communication control device 1 The tag information “B” and “C” of the “To:” header described in these “200 OK” messages are read, and these tag information “B” and “C” are stored in the tag information storage area 104. It is confirmed whether it is memorized. When it is confirmed that the tag information “B” and “C” are stored in the tag information storage area 104, the received “200 OK” message is used when establishing a session with the SIP telephones 2f and 2g. Is confirmed. At this time, the “200 OK” message corresponding to the “200 OK” message from the SIP telephones 2f and 2g that are sequentially input is not transmitted to the SIP telephone 2a. Further, “200” from the SIP telephones 2f and 2g.
The “OK” message may not be received by the SIP communication control device 1.

  Subsequently, when the “ACK” message from the SIP telephone set 2a is received by the SIP communication control device 1 (FIG. 4: step S15), the session establishment / stop unit 12b of the SIP communication control device 1 changes the “ACK” message. The tag information “α” in the “To:” header described is read out, and it is confirmed whether the tag information “α” is stored in the tag information storage area 104 in the group information storage unit 10. When it is confirmed that the tag information “α” is stored in the tag information storage area 104, it is confirmed that the received “ACK” message is used when establishing a session with the SIP telephone 2a. In this “ACK” message, the SIP URI “sip: 05012345451@sampl.com” of the SIP telephone set 2e is described as the destination SIP URI.

  Here, among the operations described above, the operation process for confirming which SIP terminal the message is used for establishing a session from the tag information of the “To:” header described in the message is as follows. The contents may be programmed to be executed by a computer that controls the SIP communication control device 1 as message recognition processing.

  Thereafter, the session establishing / stopping unit 12b transmits an “ACK” message to the SIP telephone 2e that is the source of the first received “200 OK” message via the LAN interface unit 13 (FIG. 4: step S16). . In the “ACK” message, “A” is described as tag information of the “To:” header.

  As a result, the session is established between the SIP telephone 2a and the SIP telephone 2e, and thereafter, the SIP telephone 2a and the SIP telephone 2e shift to a call state (FIG. 4: step S17).

  Thereafter, the session establishment / stop unit 12b sequentially transmits “CANCEL” messages for ending the establishment of the session to the SIP telephones 2f and 2g (FIG. 4: steps S18 and S19, call interruption step). Then, a “200 OK” message indicating that the “CANCEL” message has been accepted is sequentially received from each of the SIP telephones 2f and 2g, and the processing is terminated (FIG. 4: steps S20 and S21).

  Here, the above-described call interruption process may be configured to be programmed and executed by a computer that controls the SIP communication control device 1 as a call interruption process.

  According to such a first embodiment, for example, when a connection request describing a group SIP URI is input from the SIP telephone 2a, the telephone SIP URIs of the SIP telephones 2e, 2f, and 2g corresponding to the group SIP URI are obtained. Therefore, the SIP telephones 2e, 2f, and 2g connected to the LAN can be simultaneously called.

  Further, according to the first embodiment, since the session between the SIP telephones 2a to 2i is established by the processing in the LAN, it is possible to suppress the generation of a call charge.

  Further, according to the first embodiment, when a session is established in the LAN with respect to the SIP telephone to which the first specified telephone SIP URI is assigned, another SIP telephone is set by the session establishment / stop unit 12b. Since the incoming call to 2 is stopped, useless processing required for a response generated with another SIP telephone can be suppressed.

  Here, since SIP can be held and transferred after the session is established (call state), the SIP communication control device 1 of the first embodiment can accept a call during a call from any SIP telephone in the telephone group. It is also possible to forward to (the SIP telephone that responded first).

<Second Embodiment>
Next, a second embodiment according to the present invention will be described.

  In the first embodiment, the case where the device connected to the LAN side of the SIP communication control device 1 is a SIP telephone is shown. However, in the second embodiment, the SIP telephone is a personal computer (using a SIP communication application software) Hereinafter, it is configured to replace the SIP terminal PC).

  Normally, PCs use electronic mail application software to send and receive electronic mail between PC terminals. In such a case, a mail server is arranged in the LAN, and the e-mail address of each PC terminal is managed by this server.

In SIP communication, SIP is specified to identify each communication device (SIP telephone, personal computer, etc.).
URI (SIP Uniform Resource Identifier) is used. This SIP URI is expressed in a format similar to an e-mail address, and both have the same purpose of use for specifying each communication device. As an example, while the expression method of the email address is “username@sample.com”, SIP
The URI expression method is “sip: username@sample.com”, and the “username@sample.com” portion has the same format.

  In addition, in e-mail communication, there is a mailing list system in which a plurality of e-mail addresses are registered in a mail server as a group and information is simultaneously distributed. Therefore, e-mail addresses are used as part of a SIP URI and SIP communication is performed. By making a call to the mailing list, a simultaneous call operation can be performed for the SIP terminals PC registered in the mailing list.

  FIG. 5 is a block diagram showing the overall configuration of the second embodiment according to the present invention.

  As shown in FIG. 5, in the second embodiment, a plurality of PCs 4 in which SIP communication application software is installed and a LAN (local communication network) in which an electronic mail server 5 that manages the mail addresses of the PCs 4 is installed. SIP communication control device 6 is connected between WAN and WAN network 3. The communication control device 6 includes a group information storage unit 60, a WAN interface unit 61, a SIP termination unit 62, and a LAN interface unit 63.

  The WAN interface unit 61 and the LAN interface unit 63 have the same functions as those constituting the SIP communication control device 1 of the first embodiment.

  The group information storage unit 60 has a tag information storage area 604 as in the first embodiment.

  As shown in FIG. 11, the SIP termination unit 62 includes a destination information determination unit 62d and a session establishment / stop unit 62c. When a SIP message from a certain PC 4 is input, the destination information discriminating means 62d refers to the mailing list 51 managed by the email server 5, and the same email as a part of the destination SIP URI described in the SIP message It has a function of determining whether an address is registered in the mailing list 51.

  When a part of the destination SIP URI is registered in the mailing list 51, the destination information discriminating means 62d identifies this destination SIP URI as a group SIP URI, and an e-mail address of a PC belonging to this group, that is, a PCSIP URI. Is read from the mailing list 51 and output to the session establishment / stop unit 62c. On the other hand, when the destination SIP URI is not registered in the mailing list 51, the destination information determination unit 62d outputs the destination SIP URI as it is to the session establishment / stop unit 62c.

  The session establishment / stop unit 62c has a function of generating a PCSIP URI based on an e-mail address that is a part of the PCSIP URI, and transmitting a SIP message with the PCSIP URI as a destination SIP URI to the PC 4. Thereafter, similarly to the SIP communication control device 1 of the first embodiment, session establishment with a certain PC 4 and termination of session establishment are performed.

  According to the second embodiment, as in the first embodiment, when the SIP communication control device 1 receives a request message for the PC 4 belonging to the group, the PC SIP URI paired with the group SIP URI indicated in the request message is changed. Since it is specified, it is possible to make simultaneous incoming calls to the PCs 4 connected to the LAN.

  Further, according to the second embodiment, similarly to the first embodiment, since a session between the PCs 4 is established by processing in the LAN, it is possible to suppress the generation of a call charge.

  Further, according to the second embodiment, as in the first embodiment, when a session is established for the PC 4 to which the first specified destination information is assigned, the session establishment / stop unit 12c Since the establishment of a session with the PC 4 is stopped, useless processing required for a response generated with another PC 4 can be suppressed.

It is a block diagram which shows the whole structure of 1st Embodiment which concerns on this invention. It is a figure which shows the group address list | wrist disclosed by embodiment shown in FIG. It is a block diagram which shows the structure of the SIP termination | terminus part disclosed by embodiment shown in FIG. It is a sequence diagram which shows the whole operation | movement of embodiment shown in FIG. It is a block diagram which shows the whole structure of 2nd Embodiment which concerns on this invention. It is a block diagram which shows the structure of the SIP termination | terminus part disclosed by embodiment shown in FIG. It is explanatory drawing which shows the conventional communication control method.

Explanation of symbols

1, 6 SIP communication control device 10, 60 Group information storage unit 103 Group address list 104, 604 Tag information storage area 11, 61 WAN interface unit 12, 62 SIP termination unit 12a, 62d Destination information specifying means 12b, 62c Session establishment / Stop unit 13, 63 LAN interface unit 2a to 2i SIP telephone 3 WAN network 4 PC
5 E-mail Server 51 Mailing List 70 SIP Communication Control Device 80 SIP Telephone 90 SIP Server 95 WAN Network

Claims (3)

A communication control device connected via a local communication network to a plurality of SIP terminals using SIP as a communication control protocol ,
A group information storage unit that stores in association with the group identification information assigned to the respective groups were grouped plurality of SIP terminals and the address information of the SIP terminal belonging to the group, the information in the group information storage unit and destination information determination means for referring to the destination information contained in which is one originating terminal or Ranose cushion initiation request of the SIP terminal to determine whether or not in the group identification information, the destination information is group identification Destination identification means for reading out the address information of the SIP terminal corresponding to the group identification information from the group information storage unit when the information is determined to be information, and the session start request for all of the read address information A general calling means for transmitting
In the SIP message that relays the SIP message exchanged between the destination terminal, which is the SIP terminal to which the simultaneous calling means transmits the session start request, and the source terminal, and transmits to the source terminal Means for setting “To:” header tag information to tag information different from “To:” header tag information in a SIP message transmitted / received to / from the destination terminal;
A SIP message transmitted and received between the source terminal and the “To:” header tag information included in the SIP message transmitted / received to / from the destination terminal is stored in association with the address information of the corresponding destination terminal. A tag information storage unit for storing “To:” header tag information included in the message in association with address information of the source terminal;
When a SIP message is received from each of the SIP terminals, the information in the tag information storage unit is referred to, and based on the “To:” header tag information included in the SIP message, with respect to which SIP terminal the SIP message is associated with the session establishment Message recognition means for recognizing whether the SIP message is
When an OK message for the session start request is received from one of the destination terminals, the session start request is suspended for address information of all destination terminals other than the source of the OK message. A communication control apparatus comprising: a call interruption means for transmitting a cancel message . A communication control apparatus comprising a group information storage unit that stores a group identification information of each group obtained by grouping a plurality of SIP terminals connected via a local communication network and address information of SIP terminals belonging to the group in association with each other A communication control method according to
A request receiving step of receiving a session start request from a source terminal which is one of the plurality of SIP terminals;
It is determined by referring to the information stored in the group information storage unit whether the destination information included in the received session start request is group identification information of a group obtained by dividing the plurality of SIP terminals into several groups. Destination information determination step to be performed;
A destination identification step of identifying a SIP terminal belonging to a group indicated by the group identification information with reference to information stored in the group information storage unit when it is determined that the destination information is group identification information;
A general paging step of transmitting the session start request to all the specified SIP terminals;
A response receiving step of receiving a response message to the request from the terminating terminal which is the SIP terminal to which the session start request is transmitted;
A tag information storage step of reading out the “To:” header tag information in the response message and storing it in association with the identification information of the called terminal;
A response sending step of changing the “To:” header tag information in the response message to different tag information and sending it to the source terminal;
A tag information storage step for a sender that stores the “To:” header tag information in the transmitted response message in association with the identification information of the sender terminal;
A call interruption step of transmitting a cancel message for interrupting the session start request to all the incoming side terminals other than the originator of the OK message when receiving an OK message for the session start request from one of the incoming side terminals And a communication control method characterized by comprising: A LAN interface unit that communicates with a plurality of SIP terminals that perform communication using SIP via a private network , group identification information of each group obtained by grouping the plurality of SIP terminals, and addresses of the SIP terminals that belong to the group In a computer mounted on a communication control device including a storage unit that stores information in association with each other ,
It is determined by referring to the information stored in the group information storage unit whether or not the destination information included in the session start request sent from the source terminal which is one of the SIP terminals is group identification information. Destination information determination processing, and when the destination information is determined to be group identification information, a destination identification processing that reads out the address information of the SIP terminal corresponding to the determined group identification information from the group information storage unit, A general paging process for transmitting the session start request to all the read address information;
In the SIP message that relays the SIP message exchanged between the destination terminal which is the SIP terminal to which the session start request is transmitted in the simultaneous call processing and the source terminal and transmits to the source terminal A process of setting “To:” header tag information to tag information different from “To:” header tag information in a SIP message transmitted / received to / from the destination terminal;
The SIP message transmitted and received between the source terminal and the “To:” header tag information included in the SIP message transmitted / received to / from the called terminal is stored in association with the address information of the corresponding called terminal. Tag information storage processing for storing the “To:” header tag information included in the message in association with the address information of the source terminal in a storage unit;
The address information corresponding to the “To:” header tag information included in the SIP message sent from each SIP terminal is specified from the information in the storage unit, and the SIP message for establishing the session with which SIP terminal the SIP message is. Message recognition processing for recognizing whether it is a message,
When receiving an OK message for the session start request from one of the called terminals, the session start request is interrupted for all address information of the called terminal other than the source of the OK message. A communication control program for executing a call interruption process for transmitting a cancel message .

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