JP2009171054A - Distributed call control type ip telephony system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of actualizing the call control server function using a plurality of IP telephone terminals. <P>SOLUTION: The plurality of telephone terminals 10 are connected to a LAN (Local Area Network) 70, in which a terminal 10-1 is in charge of general management and terminates a call to an external network and each of terminals other than the terminal 10-1 has a processing function according to a SIP (Session Initiation Protocol) message in call control server processing, respectively. In addition, the terminal 10-1 manages the content of processing by and the status of the terminal in its duty other than the terminal 10-1. If the terminal 10-1 receives a call origination to an external network 60 or a call termination from the external network 60, the terminal 10-1 distributes its processing according to a type of the SIP message. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an IP telephone system that does not require a call control device.

  A conventional IP telephone system includes a call control server device that manages call control and a plurality of telephone terminals belonging to the call control server.

For example, Patent Document 1
JP 2007-219637 A

  An object of the present invention is to provide an IP telephone system that does not require a call control server device.

In order to solve the above problems, the present invention provides an IP telephone including a central IP telephone terminal that controls call control, and a plurality of distributed call control IP telephone terminals that execute part of call control in accordance with instructions from the central IP telephone terminal A system,
Each of the general IP telephone terminal and the distributed call control IP telephone terminal
Extension IP telephone terminal control means for controlling the terminal as an extension IP telephone terminal of the IP telephone system, shared information storage means for storing information shared with other IP telephone terminals, and the shared information of other IP telephone terminals Having shared information reading means for reading predetermined information from the storage means;
The general IP telephone terminal is
Call control message receiving means for receiving a call control message via WAN or LAN, and writing the call control message received by the call control message receiving means into a predetermined area of the shared information storage means of any IP telephone terminal Call control message writing means; call control message processing request means for requesting processing of the call control message to a predetermined distributed call control IP telephone terminal that identifies the type of call control message and shares the processing of the call control message; And a call control message transmitting means for transmitting a call control message generated by the distributed call control IP telephone terminal via WAN or LAN,
Each of the distributed call control IP telephone terminals
The processing contents of the call control message to be shared are determined in advance, and the call control message written by the central IP telephone terminal is shared when the central IP telephone terminal requests processing of the call control message. Call control message processing means for reading from the information storage means and executing predetermined processing, and response message generation means for generating a response message for the call control message.

  According to the present invention, since no call control server device is required, there is an advantage that the cost and installation space for the call control server device can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same reference number is given to substantially the same site | part, and description is not repeated.

  A system configuration diagram of the present invention will be described with reference to FIG.

  Each telephone terminal 10 has a function of processing a part of a call control server device (hereinafter, SIP server) allocated in advance, in addition to a SIP (Section Initiation Protocol) function as a normal telephone function. A plurality of telephone terminals 10 cooperate to realize a SIP server function and operate as an extension telephone system.

  The telephone terminal 10-1 according to the present invention includes a general responsible program among the responsible programs, and allocates call control processing to telephone terminals having other responsible programs. Specifically, the telephone terminal 10-1 requests the telephone terminals 10-2 to 10-N to perform SIP message processing performed by the SIP server in accordance with the role of the respective responsible program. Executes the processing of the program in charge.

  In addition, the partner telephone terminal 20 registers the telephone terminal 10-1 as a SIP server, and a SIP message from the external network 60 is always transmitted to the telephone terminal 10 via the telephone terminal 10-1. That is, the telephone terminal 10-1 is recognized as a SIP server from the external network 60, and transmissions from other telephone terminals 10 to the external network 60 are always transmitted via the telephone terminal 10-1. In the following description, the telephone terminal 10-1 is referred to as a general charge terminal 10-1.

  The telephone terminal 10-2 includes an INVITE responsible program among the responsible programs, and performs processing when the SIP server receives INVITE in response to a request from the general responsible terminal 10-1. In the following description, when the telephone terminal 10-2 performs a process related to the call control process, it is referred to as an INVITE terminal 10-2.

  The telephone terminal 10-3 has a 180 Ringing charge program among the responsible programs, and performs processing when the SIP server receives 180 Ringing in response to a request from the general charge terminal 10-1. In the following description, when the telephone terminal 10-3 performs a process related to the call control process, it is referred to as a 180 Ringing terminal 10-3.

  The telephone terminal 10-4 has a 200OK program in charge of each of the programs in charge, and performs processing when the SIP server receives 200OK in response to a request from the supervisor terminal 10-1. In the following description, when the telephone terminal 10-4 performs a process related to the call control process, it is referred to as a 200OK terminal 10-4.

  The telephone terminal 10-5 has an ACK charge program among the responsible programs, and performs processing when the SIP server receives ACK in response to a request from the general charge terminal 10-1. In the following description, when the telephone terminal 10-2 performs a process related to the call control process, it is referred to as an ACK terminal 10-5.

  Similarly, the telephone terminal 10-N has a program in charge of XX and performs processing according to the SIP message.

  Next, the operation of each responsible program of the telephone terminals 10-1 to 10-N will be described in more detail with reference to FIG.

  The fields of the role assignment table in FIG. 2 indicate the telephone terminal ID of each telephone terminal 10, the name of each responsible program, and the processing of each responsible program.

  The supervising terminal 10-1 of the record 1081 operates as a virtual SIP server from the counterpart telephone terminal 20, the external network 60, and the telephone terminal 10, and the exchange of SIP messages is always transmitted via the supervising terminal 10-1. The

  When the SIP message is received, a responsible terminal other than the supervisory responsible terminal to which processing is assigned for each SIP message is searched, and a SIP message processing request (call control message processing request) is transmitted to the corresponding responsible terminal. Request message processing. When the processing of each responsible terminal is completed, the notification of the processing result is received together with the SIP message processing completion notification. If there is a SIP message in the processing result received from the responsible terminal, it is transmitted to the corresponding terminal.

  Here, the SIP message processing completion notification is an IP packet for notifying that the terminal in charge other than the supervisor terminal 10-1 has executed its own call control process and has completed the process. In addition, the responsible terminals other than the general responsible terminal 10-1 generate a SIP message that the conventional SIP server receives and then transmits the SIP message as a processing result at the time of its own call control processing. The SIP message processing completion notification is generated and transmitted including the generated SIP message.

When receiving the SIP message processing request (INVITE processing request) from the overall responsible terminal 10-1, the INVITE responsible terminal 10-2 of the record 1082 analyzes the SIP message of the overall responsible terminal 10-1 and transmits the destination telephone terminal. Search for. If the search is successful, an INVITE to the destination telephone terminal and 100 Trying to the other telephone terminal 20 are generated.
Found is generated and transmitted to the overall terminal 10-1 as a SIP message processing completion notification for notifying that the processing has been completed.

  Upon receiving the SIP message processing request (180 Ringing processing request) from the overall responsible terminal 10-1, the 180 Ringing responsible terminal 10-3 of the record 1083 analyzes the SIP message of the overall responsible terminal 10-1 and transmits it to the destination telephone terminal. 180 Ringing to 10 is generated and transmitted to the supervisor terminal 10-1 as a SIP message processing completion notification.

  When the 200OK terminal 10-4 in the record 1084 receives the SIP message processing request from the supervisor terminal 10-1, the 200OK terminal 10-1 analyzes the SIP message of the supervisor terminal 10-1 and performs 200OK to the destination telephone terminal 10. And 180 Ringing to the destination telephone terminal 10 is generated and transmitted to the overall terminal 10-1 as a SIP message processing completion notification.

  When the ACK terminal 10-5 of the record 1085 receives the SIP message processing request from the central terminal 10-1, the ACK terminal 10-5 analyzes the SIP message of the central terminal 10-1 and sends an ACK to the destination telephone terminal 10. It is generated and transmitted to the supervisor terminal 10-1 as a SIP message processing completion notification.

  The XX responsible terminal 10-N of the record 1086 performs processing according to the SIP message in the same manner as the telephone terminals 10-2 to 10-5, and transmits a SIP message processing completion notification.

  When each SIP message processing is requested or a SIP message is transmitted, a memory control method using write / read processing which is one of the features of the present invention is used.

  Next, write / read processing will be described using the memory layout diagram of FIG.

  In the memory space of the telephone terminal 10, a responsible program 1001, a local data 1002, a global data 1003, a terminal function program 1005, and a terminal function data 1006 are developed.

  The memory address in FIG. 3 is an example, and may be set according to the program size and the like.

  Here, the responsible program 1001 is a responsible program in which the SIP server described in FIG. 2 is allocated for each SIP message, and the overall responsible program 1001-1 is assigned to the telephone terminal 10-2. INVITE responsible program 1001-2, 180Ringing responsible program 1001-3 is developed in telephone terminal 10-3, and XX responsible program is expanded in telephone terminal 10-n (not shown).

  The local data 1002 indicates static data used in its own program such as storage of variables and temporary data in the processing of each program.

  The global data 1003 indicates data that shares processing with other responsible terminals such as SIP messages, search results, and processing results in the processing of each responsible program. The global data 1003 further includes a plurality of message boxes 1004 for each process, and a message box number is assigned to each message box. In addition, each responsible terminal 10 constantly monitors the usage state of the message box 1004 developed between the terminals.

  When each responsible terminal 10 completes processing of its own responsible program or has a write / read process, each responsible terminal 10 refers to a message box not used by another responsible terminal and transmits a write / read process request together with the data. . If the received write / read processing request is data exceeding the capacity of the message box 1004, it is expanded between two or more message boxes.

  Next, functional blocks of the telephone terminal 10 according to the present invention will be described with reference to FIG.

  The telephone terminal 10 includes an external connection IF unit 101, a communication control unit 102, a main control unit 103, a responsible call control processing unit 104, a write / read processing unit 105, a terminal function processing unit 106, and a man-machine IF. Unit 107, state management unit 108, and storage unit 109.

  The external connection IF unit 101 is an external connection interface that sends an IP packet signal from the LAN 70 to the communication control unit 102 and sends an IP packet signal from the communication control unit 102 to the LAN 70.

  The communication control unit 102 controls general communication with the LAN 70 via the external connection IF unit 101, passes an IP packet passed from the main control unit 103 to the external connection IF unit 101, and is passed from the external connection IF unit 101. The IP packet is passed to the main control unit 103.

  The main control unit 103 is connected to the communication control unit 102, the assigned call control processing unit 104, the write / read processing unit 105, the state management unit 108, the terminal function processing unit 106, and the storage unit 109, and cooperates with each connected block. The overall processing of the own telephone terminal 10 is performed.

  The assigned call control processing unit 104 is connected to the main control unit 103, and is a block that performs assigned call control processing of the own assigned terminal among the processes of each assigned terminal described in FIG.

  When the own terminal is the supervisor terminal, the SIP message of the external network 60 or the LAN 70 is detected in cooperation with the main control unit 103 and the communication control unit 102. Then, the detected SIP message is stored in the local data memory unit 115 and the write / read processing unit 105 is instructed to transmit a write processing request for the global data 1003.

  When a message box number is received as a response to the write processing request from the write / read processing unit 105, the SIP message type is extracted from the SIP message stored in the local data memory unit 115, and the extracted SIP message type is set as the key. From the role assignment table, the IP address of the terminal in charge of the distributed processing request destination is specified.

  Here, the role assignment table is a table in which the telephone terminal ID field, the duty field, and the IP address of each telephone terminal of the role assignment table described in FIG.

  Then, an SIP message processing request including a message box number is generated for the requesting responsible terminal, and is transmitted to the requesting responsible terminal in cooperation with the main control unit 103 and the communication control unit 102.

  When a SIP message processing completion notification is received as a response to the SIP message processing request from the requesting terminal in charge, the SIP message included in the SIP message processing completion notification is extracted and transmitted as the SIP message of the own terminal.

  When the own terminal is a terminal in charge other than the general charge terminal 10-1, the SIP message processing request from the general charge Tamatsu 10-1 is detected in cooperation with the main control unit 103 and the communication control unit 102. The detected SIP message processing request is stored in the local data memory unit 115, the message box number included in the SIP message processing request is extracted, and the message box number of the global data 1003 is sent to the write / read processing unit 105. Send a read processing request.

  Next, when the read data is received from the write / read processing unit 105 as a response to the read processing request, the read data is stored in the local data unit 115. Then, processing of the program in charge in the program memory unit 113 is started.

  Here, the process of each responsible program is a process related to a general SIP message, and a description thereof will be omitted. If write / read control of global data 1003 occurs during the processing of its own program, a write / read processing request is similarly transmitted, the result is stored in the local data memory unit 115, and the processing is continued.

  When the processing of the self-responsible program is completed, the self-terminal generates a SIP message to be transmitted as a processing result by the terminal in charge other than the supervisory terminal 10-1. Then, in cooperation with the main control unit 103 and the communication control unit 102, a SIP message processing completion notification including the generated SIP message is transmitted to the overall terminal 10-1.

  The write / read processing unit 105 is a block that is connected to the main control unit 103 and generates the global data message box write / read processing and write / read processing request described with reference to FIG. When a write / read processing request is detected in cooperation with the control unit 102, the memory box number is extracted, and the corresponding memory address in the message box address table stored in the message box management unit 114 is extracted using the extracted memory box number as a key. Extract and perform write / read processing.

  Here, the message box address table is a correspondence table of the memory box number and the memory address of each terminal, which is stored in the message box management unit 114.

  When a read processing request is received, the corresponding memory address is extracted from the message box address table using the message box number included in the read processing request as a key, and the data at the extracted memory address is read as read data. Then, in cooperation with the main control unit 103 and the communication control unit 102, a read processing completion notification including read data is transmitted to the terminal in charge who has transmitted the read processing request.

  When a write process request is received, the write data and message box number included in the write process request are extracted, and the corresponding memory address is extracted from the message box management table using the extracted message box number as a key. Write data to. Then, in cooperation with the main control unit 103 and the communication control unit 102, the completion of the write process is transmitted as a write process completion notification to the terminal in charge that has transmitted the write process request.

  When the write / read processing completion notification is detected in cooperation with the main control unit 103 and the communication control unit 102, if the read processing completion notification is detected, the read data included in the read processing completion notification is handled by the assigned call control processing. If it is a write processing completion notification, it is passed to the assigned call control processing unit 104.

  Further, when a transmission instruction for a write / read processing request is received from the assigned call control processing unit 104, the unused message box number is searched from the message box management table.

  Here, the message management table is a table in which the message box number expanded in the global data 1003 is associated with the use state. Further, only the message box number is assigned a memory address, and the table is stored each time write / read processing is performed. Update.

  The terminal function processing unit 106 is connected to the main control unit 103 and the man-machine IF unit 107, and performs general phone call function processing as a terminal and control of input / output devices such as dial keys, handsets, speakers, LCDs and other display devices (not shown). I do.

  The man-machine IF unit 107 is connected to the terminal function processing unit 106 and includes input / output devices such as dial keys, handsets, speakers, LCDs and the like (not shown), and the terminal function processing unit 106 uses information from the input device as a digital signal. The digital signal information sent from the terminal function processing unit 106 is displayed on the output device.

  The state management unit 108 is connected to the main control unit 103 and saves a role assignment table (not shown) when the own terminal 10 is the overall charge terminal, and changes the SIP message charge terminal according to an instruction from the main control unit 103. A storage unit to be referred to. If the terminal 10 is a SIP message terminal, the state management unit 108 does not operate.

  The storage unit 109 is a memory storage unit that is connected to the main control unit 103 and the terminal function processing unit 106 and refers to data according to an instruction from each block. In addition, the storage unit 109 includes a call control memory unit 110 and a terminal function memory unit 111.

  In the present embodiment, the state management unit 108 and the storage unit 109 are described separately for easy understanding, but the state management unit 108 may be included in the storage unit 109.

  The assigned call control memory unit 110 is a storage unit related to the assigned program of the storage unit 109 related to the role sharing shown in FIG. 2, and includes a global data memory unit 112, a program memory unit 113, a message box management unit 114, and a local data memory unit. 115 is a storage unit used for assigned call control processing that is distributed to each telephone terminal.

  The global data memory unit 112 is a memory area in which the global data described in FIG. 3 is stored, and stores data such as message box data and SIP messages.

  The program memory unit 113 is a memory area for storing the program data described with reference to FIG.

  The message box management unit 114 is a memory area that stores a message box management table and a message box address table.

  The local data memory unit 115 is a memory area in which the local data described with reference to FIG. 3 is stored.

  The terminal function memory unit 111 is a storage unit related to a terminal function, and includes a terminal function program memory unit 116 and a terminal function data memory unit 117.

  The terminal function program memory unit 116 is a memory area in which the terminal function program described with reference to FIG. 3 is stored, and stores a program that operates as a telephone terminal.

  The terminal function data memory unit 117 is a memory area in which the terminal function data described with reference to FIG. 3 is stored, and stores setting data and the like for operating as a telephone terminal.

  Next, the processing flow of the telephone terminal 10 will be described with reference to FIG. This flow starts from a state in which a plurality of telephone terminals 10 to which a program in charge is assigned are turned on but a telephone system is constructed.

  First, it is determined whether or not a key operation or an on-hook operation has been performed on the man-machine IF unit 107 (S1). Here, when there is a key operation or an on-hook operation (S1: Yes), the terminal function processing unit 106 of the telephone terminal 10 performs terminal function processing in accordance with the operation (S2) and the main control unit 103 is operated. To be notified.

  Here, the terminal function processing is a telephone function on the terminal side using the SIP protocol.

  If it is not a key input operation or an on-hook operation (S1: No), the communication control unit 102 determines whether or not an IP packet addressed to itself is received from the LAN 70 via the external connection IF unit 101 (S3). . If an IP packet addressed to the terminal itself has not been received (S3: No), the process returns to S1.

  When an IP packet addressed to the terminal itself is received (S3: Yes), the communication control unit 102 passes the IP packet to the main control unit 103, and the main control unit 103 includes the assigned call control processing unit 104 and the write / read processing unit 105. Analyzes IP packets received in cooperation. If the IP packet is an IP packet for assigned call control processing (S4: Yes), the main control unit 103 passes the IP packet to the assigned call control processing unit 104, and the assigned assigned call control processing unit 104 receives the IP packet shown in FIG. Then, various responsible call control processes assigned to each responsible terminal described later in FIG. 7 are performed (S5), and the process returns to S1.

  When the IP packet is an IP packet for global data write / read processing request (S6: Yes), the main control unit 103 passes the IP packet to the write / read processing unit 105.

  When the write / read processing unit 105 receives the IP packet of the write / read processing request, it analyzes the write / read processing request, writes read / write flag information, a message box number, and write data when it is a write. The source address of the IP packet is extracted and stored in the local data memory unit 115.

  When the extracted flag information is a read flag (S7: Read), the write / read processing unit 105 reads the data of the extracted message box number (S8). Then, read data is transmitted to the source of the extracted IP packet (S9), and the process returns to S1.

  If the extracted flag information is a write flag (S7: write), the write / read processing unit 105 writes write data to the extracted message box number (S10). Then, the completion of writing is transmitted to the transmission source of the IP packet (S11), and the process returns to S1.

  If the IP packet is not the assigned call control process or the write / read process (S6: No), it is determined that the process is on the terminal side, such as an incoming call, and the main control unit 103 passes the IP packet to the terminal function processing unit 106 to Function processing is performed (S2), and the process returns to S1.

  Next, the processing flow of the overall responsible terminal 10-1 in the responsible terminal process of FIG. 5 will be described with reference to FIG.

  When the assigned call control processing of the central responsible terminal is started in S5, the assigned call control processing unit 104 stores the IP packet of the SIP message received from the main control unit 103 in the local data memory unit 115, and the write / read processing unit. In cooperation with 105, an instruction to send a write processing request is given.

  Upon receiving the instruction, the write / read processing unit 105 designates an unused message box number from the message box management table of the message box management unit 114 (S501).

  Then, the message box address table of the message box management unit 114 is searched using the designated message box number as a key, and it is determined whether or not it is the message box number of the own terminal (S502).

  If it is the message box number of its own terminal (S502: Yes), the main control unit 103 is notified, and the notified main control unit 103 stores data in the memory address of the corresponding message box number in the global data memory unit 112. Store (S503) and proceed to S506.

  If it is the message box number of the terminal itself (S502: No), a write processing request including a write flag information, an empty message box number, and a SIP message to be written is generated for the telephone terminal of the message box number. (S504). Then, it waits until a write processing completion notification is received from the telephone terminal that has transmitted the write request (S505).

  Next, the assigned call control processing unit 104 analyzes the type of the received SIP message.

  If the SIP message is an INVITE SIP message (hereinafter referred to as INVITE message) (S506: Yes), the assigned call control processing unit 104 searches the role assignment table of the state management unit 108 for the INVITE responsible terminal using the INVITE message as a key (S507). ). Then, the IP address of the searched INVITE terminal is extracted, and an INVITE processing request including the message box number designated in S501 is generated with the extracted IP address as the destination. Further, the assigned call control processing unit 104 sends the INVITE processing request generated in the communication control unit 102 in cooperation with the main control unit 103 and the communication control unit 102 to the INVITE terminal on the LAN via the external connection IF unit 101. A processing request is transmitted (S508).

  If it is a 180 Ringing SIP message (hereinafter, “180 Ringing message”) (S509: Yes), the assigned call control processing unit 104 searches for the 180 Ringing responsible terminal from the role assignment table of the state management unit 108 using the 180 Ringing message as a key (S510). ). Then, the IP address of the searched 180 Ringing terminal is extracted, and a 180 Ringing processing request including the message box number specified in S501 is generated with the extracted IP address as the destination. Furthermore, the assigned call control processing unit 104 sends the 180 Ringing processing request generated in the communication control unit 102 in cooperation with the main control unit 103 and the communication control unit 102 to the 180 Ringing responsible terminal on the LAN via the external connection IF unit 101. A processing request is transmitted (S511).

  If it is a 200 OK SIP message (hereinafter, “200 OK message”) (S512: Yes), the assigned call control processing unit 104 searches the role assignment table of the state management unit 108 for a 200 OK assigned terminal using the 200 OK message as a key (S513). ). Then, the IP address of the searched 200OK terminal is extracted, and a 200OK processing request including the message box number designated in S501 is generated with the extracted IP address as the destination. Further, the assigned call control processing unit 104 sends the 200 OK processing request generated in the communication control unit 102 in cooperation with the main control unit 103 and the communication control unit 102 to the 200 OK terminal on the LAN via the external connection IF unit 101. A processing request is transmitted (S514).

  If the SIP message is an ACK SIP message (hereinafter, ACK message) (S515: Yes), the assigned call control processing unit 104 searches the role assignment table of the state management unit 108 for the ACK responsible terminal using the ACK message as a key (S516). ). Then, the IP address of the searched ACK terminal is extracted, and an ACK processing request including the message box number specified in S501 is generated with the extracted IP address as the destination. Further, the assigned call control processing unit 104 ACKs the ACK processing request generated in the communication control unit 102 in cooperation with the main control unit 103 and the communication control unit 102 to the ACK handling terminal on the LAN via the external connection IF unit 101. A processing request is transmitted (S517).

  Further, when the extracted SIP message type is other than the above (S515: No), each SIP message request process is similarly performed (S518). In this description, description of SIP message processing other than the above is omitted.

  When transmission of each SIP message processing request is completed, the process waits until a SIP message processing completion notification is received (S519).

  When the SIP message processing completion notification is received (S519: Yes), the assigned call control processing unit 104 transmits the SIP message generated when the own assigned call control processing is completed (S520), and returns to S1 of FIG.

  Next, with reference to FIG. 7, the processing flow of the responsible terminal other than the supervisory responsible terminal will be described in S5.

  (A) of FIG. 7 is a processing flow of the terminal in charge of INVITE.

  First, when the assigned call control processing unit 104 receives the IP packet for the INVITE processing request from the main control unit 103, it stores it in the local data memory unit 115 and extracts the message box number. Then, the INVITE message stored in the global data 1003 is read from the extracted message box number.

  Specifically, the message box address table is searched using the message box number as a key, and it is determined whether or not the message box number of the own terminal is the message box of the own terminal.

  If it is the message box of the own terminal, the memory address of the matched message box number is extracted from the message box address table, and the INVITE message stored in the memory address is read.

  If it is not the message box of its own terminal, the message box management table is further searched using the message box number as a key. Then, the terminal in charge with the matched message box number is extracted and a read request is transmitted to the terminal in charge. Further, when a read processing completion notification is received from the terminal in charge, the read data of the INVITE message included in the read processing completion notification is extracted.

  Next, when the INVITE message is read, the INVITE message is stored in the local data memory unit 115, and the destination user ID (external line number) is extracted. Next, the assigned call control processing unit 104 searches for a record of the corresponding user ID from a destination table (not shown) of the storage unit 109 using the destination user ID extracted in cooperation with the main control unit 103 as a key (S522).

  Here, the destination table is a table having a user ID and an IP record for each telephone terminal 10 belonging to the telephone system, and is a table held by a normal SIP server.

  If there is a record of the corresponding user ID (S523: Yes), the assigned call control processing unit 104 generates an INVITE message with the destination IP address as the destination, and sends a 100 Trying message with the source IP address as the destination. It is generated and stored in the local data memory unit 115 (S524). If there is no corresponding user ID record (S523: No), a 404 Not Found message is generated with the IP address of the transmission source that transmitted the INVITE message as the destination, and stored in the local data memory unit 115 (S525). Then, a SIP message processing completion notification including the generated SIP message is transmitted to the supervisor terminal (S526), and the process returns to S1 in FIG.

  FIG. 7B is a process flow of the 180 Ringing terminal.

  First, when the assigned call control processing unit 104 receives the IP packet of the 180 Ringing processing request from the main control unit 103, it stores it in the local data memory unit 115 and extracts the message box number. Then, the 180 Ringing message stored in the global data 1003 is read from the extracted message box number (S541).

  Then, the 180 Ringing message is analyzed, and the IP address of the destination telephone terminal is extracted (S542). Then, a 180 Ringing message is generated using the extracted IP address of the destination telephone terminal as the destination IP address (S543). Then, a SIP message processing completion notification including the generated SIP message is transmitted to the supervisor terminal (S544), and the process returns to S1 in FIG.

  (C) of FIG. 7 is a processing flow of the terminal in charge of 200OK.

  First, the assigned call control processing unit 104 receives the 200 OK processing request IP packet from the main control unit 103, stores it in the local data memory unit 115, and extracts the message box number. Then, the 200OK message stored in the global data 1003 is read from the extracted message box number (S561).

  Then, the 200OK message is analyzed, and the IP address of the destination telephone terminal is extracted (S562). Then, a 200 OK message is generated with the IP address of the extracted destination telephone terminal as the destination IP address (S563). Then, a SIP message processing completion notification including the generated SIP message is transmitted to the supervisor terminal (S564), and the process returns to S1 in FIG.

  (D) of FIG. 7 is a processing flow of the terminal in charge of ACK.

  First, when the assigned call control processing unit 104 receives an IP packet for an ACK processing request from the main control unit 103, it stores it in the local data memory unit 115 and extracts a message box number. Then, the ACK message stored in the global data 1003 is read from the extracted message box number (S581).

  Then, the ACK message is analyzed, and the IP address of the destination telephone terminal is extracted (S582). Then, an ACK message is generated with the extracted destination telephone terminal IP address as the destination IP address (S583). Then, a SIP message processing completion notification including the generated SIP message is transmitted to the supervisor terminal (S584), and the process returns to S1 in FIG.

  Even in the case of SIP messages other than those described above, the assigned call control process via the global data 1003 is similarly performed.

  Next, an operation sequence from when the telephone system receives an incoming call from the other party telephone terminal 20 to the telephone terminal 10-3 and makes a telephone call will be described with reference to FIG.

  First, when an INVITE message is received from the partner telephone terminal 20 to the general charge terminal 10-1 (S101), the general charge terminal 10-1 stores the received INVITE message in a message box of the global data memory unit 112. Then, using the received INVITE message as a key, the role assignment table of the state management unit 108 is searched to extract the corresponding INVITE terminal 10-2. Then, an INVITE processing request including the message box number of the message box stored in the global data memory unit 112 destined for the extracted INVITE terminal 10-2 is generated and transmitted (S102).

  Upon receiving the INVITE processing request, the INVITE terminal 10-2 performs read processing on the data in the message box from the terminal having the message box number included in the INVITE processing request. Then, the INVITE process of the read message box is executed, and an INVITE message addressed to the telephone terminal 10-3 and a 100 Trying message addressed to the partner telephone terminal 20 are generated. Next, an INVITE processing completion notification including the generated SIP message is transmitted to the overall terminal 10-1 (S103).

  Upon receiving the INVITE processing completion notification, the supervisor terminal 10-1 transmits the INVITE and 100 Trying SIP messages, and transmits the INVITE message to the telephone terminal 10-3 as its own SIP message (S104). In response to this, a 100 Trying message is transmitted (S105).

  Next, when the telephone terminal 10-3 receives the INVITE message, the terminal function processing unit 106 performs INVITE terminal function processing, and returns 180 Ringing and 200 OK to the overall terminal 10-1 (S106, S110).

  When the supervising terminal 10-1 receives the 180 Ringing message from the telephone terminal 10-3 (S106), the supervising terminal 10-1 stores the received SIP message in the message box of the global data memory unit 112. Then, the destination of the corresponding 180 Ringing terminal 10-3 is extracted with reference to the role assignment table of the state management unit 108 using the received SIP message as a key. Then, a 180 Ringing processing request including the message number of the message box stored in the global data memory unit 112 addressed to the 180 Ringing terminal 10-3 is generated and transmitted (S107).

  Upon receiving the 180 Ringing process request, the 180 Ringing terminal 10-3 transmits a read request from the message box number included in the 180 Ringing process request to the telephone terminal in which the message box number is expanded, and performs the read process. Then, the 180Ring process of the read message box is executed, a 180Ringing message addressed to the other party telephone terminal 20 is generated, and a 180Ringing process completion notification including the 180Ringing message is transmitted to the overall terminal 10-1 (S108).

  Receiving the 180Ringing process completion notification, the supervisory terminal 10-1 transmits a 180Ringing SIP message as a SIP message of its own terminal to the partner telephone terminal 20 (S109).

When the supervisor terminal 10-1 receives the 200 OK message from the telephone terminal 10-3 (S110), the supervisor terminal 10-1 stores the received SIP message in the global data memory unit 112. Then, using the received SIP message as a key, the role assignment table of the state management unit 108 is referred to and the corresponding 200
The destination of the OK terminal 10-3 is extracted. Then, a 200 OK processing request including the SIP message stored in the global data memory unit 112 addressed to the 200 OK terminal 10-3 is generated and transmitted (S111).

  Upon receiving the 200 OK processing request, the 200 OK terminal 10-3 transmits a read request from the message box number included in the 200 OK processing request to the telephone terminal in which the message box number is expanded, and performs the read processing. . Then, the 200 OK process of the read message box is executed, a 200 OK message addressed to the other party telephone terminal 20 is generated, and a 200 OK process completion notice including the 200 OK message is transmitted to the overall responsible terminal 10-1 (S112).

  Upon receiving the 200 OK processing completion notification, the supervisor terminal 10-1 transmits a 200 OK SIP message as a SIP message of its own terminal to the partner telephone terminal 20 (S113).

  When the supervising terminal 10-1 transmits 200 OK, the partner telephone terminal 20 transmits ACK.

  When the ACK message is received from the partner telephone terminal 20 to the general charge terminal 10-1 (S114), the general charge terminal 10-1 stores the received ACK message in the global data memory unit 112. Then, with reference to the role assignment table of the state management unit 108 using the received SIP message as a key, the corresponding ACK terminal 10-2 is referred to. Then, an ACK processing request including the message box number of the message box stored in the global data memory unit 112 destined for the referred ACK terminal 10-2 is generated and transmitted (S115).

  The ACK terminal 10-3 that has received the ACK processing request transmits a read request from the message box number included in the ACK processing request to the telephone terminal in which the message box number is expanded, and performs the read processing. Then, the ACK process of the read message box is executed, an ACK message addressed to the other party telephone terminal 20 is generated, and an ACK process completion notification including the ACK message is transmitted to the overall charge terminal 10-1 (S116).

Upon receiving the ACK processing completion notification, the supervisor terminal 10-1 transmits an ACK SIP message as an SIP message of its own terminal to the 180 Ringing terminal 10-3 (S117), and the communication path is established and the voice is established. A data call is started (S118).

  The embodiment of the present invention has been described above.

  In the present embodiment, in order to realize the SIP server function in a plurality of telephone terminals 10, each of the telephone terminals 10 having a normal telephone function processes a part of the SIP server processing, and further, the SIP server function A part of the processing was divided into a SIP message handling terminal in charge of processing for each type of SIP message, and a general handling terminal 10-1 allocating processing to the SIP message handling terminal. For this reason, it is possible to construct an extension telephone system simply by arranging a plurality of telephone terminals 10, and there is an effect that it is possible to reduce the space and cost for installing a SIP server or the like.

  Further, in the present embodiment, each telephone terminal 10 has a global data memory unit 112, and memory control (write / read control) performed by the SIP server is performed on the LAN, so that each telephone terminal 10 has free memory. Effective use of the area. For this reason, even when the scale of the telephone system is expanded, the memory area of the increasing global data of the telephone terminal can be used, so that the system can be flexibly expanded.

  Furthermore, since the data developed in the global data memory section is write / read control in message box units, the memory design for each terminal is free.

  In the description of the present embodiment, the case where SIP control is used is described as an example. However, the present invention is not limited to this.

  Further, in this embodiment, the number of programs in charge of each processing terminal is limited to one for easy understanding, but the present invention is not limited to this. For example, it may be distributed to a plurality of responsible programs depending on the performance of the telephone terminal 10 or the processing time of the responsible program itself, or the number of responsible programs owned by the telephone terminal 10 may be different. By managing a plurality of programs in charge, the number of telephone terminals required for the call control server can be reduced, and the load on each SIP terminal can be distributed.

  Furthermore, although the call control server related to outgoing / incoming calls has been described in the present embodiment, the present invention is not limited to this. For example, a server function that can be connected to a call control server such as a presence server, a mail server, or a voice mail server using SIP control may be distributed in this telephone system.

  Furthermore, in this embodiment, the global memory address stores only the global address space of its own terminal and performs write / read processing by multicast / broadcast, but the present invention is not limited to this. For example, the IP address of the telephone terminal assigned for each global address space may be used as a record to perform write / read processing by unicast. This has the effect of reducing the load on the network.

  Furthermore, in this embodiment, for the sake of easy understanding, the SIP message handling terminal is described as one program in charge, but the present invention is not limited to this. For example, a plurality of responsible programs are duplicated for each telephone terminal, and the overall responsible terminal 10-1 monitors the processing state of each telephone terminal in the role assignment table of the state management unit 108, and each telephone terminal You may sort according to the state. As a result, the processing load can be further distributed, and even if the assigned terminal is temporarily out of service due to a failure or disconnection, it is supplemented by another telephone terminal. There is also an effect.

  Furthermore, in the present embodiment, the case where the distributed processing is distributed for each SIP message has been described, but the present invention is not limited to this. For example, an INVITE processing control telephone terminal that controls the INVITE processing may be arranged in addition to the terminal in charge of the processing to further distribute the processing, and the INVITE processing may be distributed and processed. As a result, the processing load can be distributed, and the memory capacity required for the distributed processing of the call control server can be reduced.

  Conversely, if there are only a few connected devices and the number is less than the required SIP message terminal, a plurality of SIP messages may be processed simultaneously.

  Further, in the present embodiment, for the sake of easy understanding, the overall terminal in charge is described as one, but the present invention is not limited to this. For example, if the supervisor terminal is registered in a carrier-side SIP server not shown in FIG. 1, there are as many supervisor terminals as the number of lines that can be registered, and the supervisor terminals are registered. Each supervising terminal manages the state of each SIP message terminal, and each terminal may operate as a SIP server. As a result, the global data memory can be shared by a plurality of supervising terminals, and there is an effect that the accommodation line can be easily increased.

  Furthermore, although the call control server has been described in the present embodiment, the present invention is not limited to this. For example, a server function that can be connected to a call control server such as a presence server, a mail server, or a voice mail server using SIP control may be distributed in this telephone system.

System configuration diagram of this IP phone system Role assignment table Memory layout of this IP phone system Block diagram of telephone terminal of the present invention Phone terminal flowchart Flow chart of the terminal in charge Flow chart of the terminal in charge other than the supervisor terminal Incoming call processing sequence

Explanation of symbols

10: Telephone terminal, 10-1: Telephone terminal (in charge of generalization), 10-2: Telephone terminal (in charge of INVITE), 10-3: Telephone terminal (in charge of 180 Ringing), 10-4 Telephone terminal (in charge of 200OK), 10- 5: Telephone terminal (ACK charge), 10-N: Telephone terminal (XX charge),
20: partner telephone terminal, 60: external network, 70: LAN, 101: external connection IF unit, 102: communication control unit, 103: main control unit, 104: assigned call control processing unit,
105: write / read processing unit, 106: terminal function processing unit, 107: man-machine IF unit, 108: state management unit, 109: storage unit, 110: assigned call control memory unit, 111: terminal function program memory unit,
112: Global data memory unit, 113: Program memory unit, 114: Message box management unit, 115: Local data memory unit, 116: Terminal function memory unit,
117: Terminal function data memory unit

Claims (2)

An IP telephone system including a central IP telephone terminal that supervises call control and a plurality of distributed call control IP telephone terminals that execute part of call control in accordance with instructions from the central IP telephone terminal,
Each of the general IP telephone terminal and the distributed call control IP telephone terminal
Extension IP telephone terminal control means for controlling the own terminal as an extension IP telephone terminal of the IP telephone system, shared information storage means for storing information shared with other IP telephone terminals, and other distributed call control IP telephone terminals Having shared information reading means for reading predetermined information from the shared information storage means;
The general IP telephone terminal is
Call control message receiving means for receiving a call control message via a WAN or LAN, and a call control message received by the call control message receiving means for a predetermined area of shared information storage means of any distributed call control IP telephone terminal Call control message writing means for writing the call control message, and call control message processing for requesting processing of the call control message to a predetermined distributed call control IP telephone terminal for identifying the type of the call control message and sharing the processing of the call control message Request means, and call control message transmission means for transmitting a call control message generated by the distributed call control IP telephone terminal via WAN or LAN,
Each of the distributed call control IP telephone terminals
The processing contents of the call control message to be shared are determined in advance, and the call control message written by the central IP telephone terminal is shared when the central IP telephone terminal requests processing of the call control message. A distributed call control type IP telephone system, comprising: a call control message processing unit that reads from an information storage unit and executes predetermined processing; and a response message generation unit that generates a response message to the call control message. The telephone system according to claim 1,
The shared information storage means has a number of message boxes for storing information in units of call control messages, and each of the number of message boxes is given an identification label,
The distributed call control type IP telephone system, wherein the central IP telephone terminal or the distributed call control IP telephone terminal accesses the shared information storage means by the label.

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