JP4924082B2 - IP phone with call control function - Google Patents

Description

  The present invention relates to an IP phone system, and more particularly to an IP phone system that causes a terminal to execute call control processing.

  A conventional IP business phone system includes a server device having call control functions such as outgoing, incoming call, hold, and transfer of a business phone connected to a LAN, a plurality of terminals connected to the LAN, and a WAN that provides a communication service with the LAN. It consists of a gateway device that connects to the. As the server device, a SIP server compliant with SIP (Session Initiation Protocol), ITU-T H.264, and the like. There are gatekeepers conforming to H.323 or IP-PBX (IP private branch exchange) having these functions.

  However, if these server devices are installed, the cost burden on the user such as the cost of the device, installation work, and maintenance costs increases. In particular, in a small office, the cost of the server device to the system is large for the scale.

  Patent Document 1 discloses a method in which a function equivalent to a server function is installed in a gateway device, and functions such as hold and transfer are realized without a server.

Japanese Patent Laying-Open No. 2005-252809

  However, in the technique described in Patent Document 1, a special gateway is used, and in some cases a special protocol is required, so that a free system cannot be constructed. In addition, since the gateway device simultaneously realizes gateway processing and server processing for controlling a plurality of lines, it requires a CPU with high processing capability and the device cost increases. Furthermore, when the gateway device breaks down, there is a problem that the extension control in the LAN cannot be performed as well as the connection to the WAN.

  The present invention has been made in view of the above circumstances. An object of the present invention is to provide a technology for realizing a business phone system function in an IP business phone system without installing a device having a server function.

The above-described problem is an IP phone having a call control function that constitutes an IP phone system, and a call control process for processing call control related to outgoing / incoming calls of the own IP phone or another IP phone belonging to the own IP phone Call control activation information indicating that the own IP phone activates the call control processing means, and a call control activated IP phone search packet transmission means for multicasting a packet for searching for another IP phone that activates the call control processing means Call control activation information transmitting means for multicast transmission to other IP phones, and when the IP phone search packet during activation of call control is received when the own IP phone activates the call control processing means, the call control processing means is activated. Call control active response packet transmission means for transmitting a response packet indicating that the call control is active, and call control active IP phone search packet from another IP phone, or control A call control starts in IP phone search packet / response packet receiving means for receiving a capability activation in the response packet, the call control start information receiving means for receiving a call control activation information from another IP phone, a belonging request command to another IP phone A call control activation IP phone search packet / response packet reception means before the call control activation IP phone search packet transmission means transmits the call control activation IP phone search packet. When an IP phone search packet during call control activation is received from another IP phone, the IP phone search packet transmission means during call control activation stops transmission of the IP phone search packet during call control activation and searches for an IP phone during call control activation. after the packet transmission means has transmitted the IP phone search packet during startup, before starting the call control processing, or the call control activation information transmission Before stage sends a call control activation information, if the call control activation in IP phone search packet / response packet receiving means receives a call control starts in the response packet, without starting the call control processing means, the call control activation When the information transmission means stops transmitting the call control activation information and the call control activation information reception means receives the call control activation information from another IP phone, the attribution request transmission means sends an attribution request command to the transmission source of the call control activation information. And when the IP phone search packet transmitting means during call control activation transmits the IP phone search packet during call control activation, the IP phone search packet / response packet reception means during call control activation is starting call control from another IP phone. When the IP phone search packet is not received, the call control activation IP phone search packet transmission means transmits the call control activation IP phone search packet. If the call control activation IP phone search packet / response packet reception means has not received the call control activation IP phone response packet before the call control activation information transmission means transmits the call control activation information, the call control processing This can be achieved by the IP phone having a call control function in which the call control activation information transmitting means transmits the call control activation information .

  According to the present invention, it is possible to provide an inexpensive and highly reliable IP phone system that does not require a server device.

  Embodiments of the present invention will be described below with reference to the drawings using examples. Note that the same reference numerals are assigned to the same parts, and description thereof is not repeated. Here, FIG. 1 is a block diagram illustrating a network configuration. FIG. 2 is a functional block diagram of the terminal. FIG. 3 is a hardware block diagram of the terminal. FIG. 4 is a registration sequence diagram of terminals other than the terminal that is activating the call control server activation terminal determination and call control server function. FIG. 5 shows a state in which the registration sequence of FIG. 4 is completed and a terminal other than the terminal that has activated the call control server function detects the call control server function (hereinafter referred to as another terminal). FIG. 10 is a sequence diagram in which another terminal activates the call control server function when the link between the terminal that activates the call control server function and the network is disconnected in the monitored state. FIG. 6 is a flowchart of a terminal according to call control server activation terminal determination. FIG. 7 is a flowchart of the terminal monitoring the call control server function. FIG. 8 is a flowchart for explaining processing of the call control server function.

  In FIG. 1, the network includes a WAN 11, a gateway (GW) 13 connected to the WAN 11 and a terminal processing type IP phone system 20, and a terminal processing type IP phone system 20. The terminal processing IP phone system 20 includes a LAN 12 and a plurality of terminals 30 connected to the LAN 12. Here, all of the terminals 30 are terminals having a call control server function, and the terminal 30-1 has activated the call control server function. On the other hand, the terminals 30-2 to 30-4 are terminals that have not activated the call control server function. The terminals 30-2 to 30-4 belong to the call control server function activated by the terminal 30-1, and the terminal 30-1 itself belongs to the call control server function activated by the terminal 30-1.

  In FIG. 2, the terminal 30 calls a LAN interface unit 300 connected to the LAN 12, a communication control unit 301 connected to the LAN interface unit 300, and a terminal-side call control protocol unit 302 connected to the communication control unit 301. Control server activation communication unit 304, call control server protocol unit 305, call control server confirmation communication unit 306, terminal side call control protocol unit 302, man-machine interface unit 307 connected to call control server protocol unit 305, call control The server activation communication unit 304 and the call control server function determination processing unit 303 connected to the call control server protocol unit 305 are configured.

  The LAN interface unit 300 is a physical interface unit for performing communication via the LAN 12 such as Ethernet (registered trademark). The LAN interface unit 300 also performs access control. The communication control unit 301 controls communication with the Ethernet. The terminal-side call control protocol unit 302 communicates with a terminal in which a call control server function is activated in order to make / receive a call or transfer. The call control server function activation determination processing unit 303 determines whether or not to activate the call control server of its own terminal according to a predetermined rule. The call control server activation communication unit 304 notifies other terminals that the call control server function has been activated together with the address of the own terminal. When another terminal activates the call control server function, the call control server activation communication unit 304 receives the notification and performs processing for registering the terminal address included in the notification information as the address of the call control server.

  The call control server protocol unit 305 has a call control server function, and performs registration processing and state management call control for the own terminal and other terminals. In this embodiment, since SIP is applied to call control, the call control server protocol unit 305 has a SIP proxy server function, a registrar server function, and a location server function. In addition, the SIP server function may be distributed at each terminal like a general SIP server. The call control server confirmation communication unit 306 detects whether or not the call control server function activated by another terminal is functioning normally. The man-machine interface unit 307 performs voice input / output, key input, and LCD display.

  3, the terminal 30 includes a LAN interface unit 300 connected to the LAN 12, a central processing unit 310 connected to the LAN interface unit 300, a voice input / output unit 314 connected to the central processing unit 310, and a display. The unit 315, the key input unit 316, the data storage memory unit 312, the program storage memory unit 311, and a power supply unit 317 that supplies power to each unit.

  The program storage memory 311 stores a program for realizing the function of the terminal 30 and the call control server function. The central processing unit 310 controls the entire terminal 30 according to the program stored in the program storage memory 311. The data storage memory 312 stores communication data and data used for arithmetic processing. The voice input / output unit 314 is a microphone, a speaker, and a handset, and further performs voice encoding / decoding. The display unit 315 performs character, image display, and visible light display using an LCD or LED. The key input unit 316 realizes key input using buttons or a touch panel.

  In FIG. 4, the terminals 30-1 to 30-3 are powered on almost at the same time to establish a link with the network (S401 to S403). After the link with the network is established, the terminals 30-1 to 30-3 set a random number timer (S404 to S406). Here, the random number timer is a timer with a random timeout time. Here, it is assumed that the random number timer of the terminal 30-1 has timed out first.

  After the timeout of the random number timer, the terminal 30-1 sets a call control server search timer (S408), and transmits a call control server search packet by multicast (S409). The terminals 30-2 and 30-3 that have received the call control server search packet stop the random number timer (S411, S412). The terminal 30-1 that has transmitted the call control server search packet does not receive a response, so that the call control search timer has timed out, activates its own call control server function (S413), and notifies itself of the call control server activation notification. And multicast address (S414). The terminal 30-1 registers its own terminal in its own call control server (S416). When receiving the call control server activation notification, the other terminals 30-2 and 30-3 store the address of the terminal that activated the call control server function as the call control server address (S417, S418).

  The terminal 30-2 transmits a registration request (REGISTER) to the call control server function of the terminal 30-1 (S419). The terminal 30-1 that has received the registration request registers in the call control server function (S421), and transmits registration execution (200 OK) to the terminal 30-2 that has requested registration (S422). Similarly, the terminal 30-3 transmits a registration request to the call control server function of the terminal 30-1 (S423). The terminal 30-1 that has received the registration request registers in the call control server function (S424), and transmits registration to the terminal 30-3 that has requested registration (S426).

  Here, it will be described that the terminal 30-4 is turned on with a delay. When powered on, the terminal 30-4 establishes a network link (S427) and sets a random number timer (S428). When the random number timer times out before receiving the call control server activation notification packet, the terminal 30-4 sets the call control server search timer (S429), and transmits the call control server search packet by multicast (S431). When receiving the call control server search packet, the terminal 30-1 transmits a call control server search response including its own address to the terminal 30-4 (S432). The terminal 30-4 receiving the call control server search response before the call control server search timer times out stops the call control server search timer (S433), and stores the address of the terminal 30-1 as the address of the call control server. (S434). The terminal 30-4 transmits a registration request to the call control server function of the terminal 30-1 (S435). The terminal 30-1 that has received the registration request registers in the call control server function (S436), and transmits the registration execution (200 OK) to the terminal 30-4 that requested the registration execution (S437).

  In FIG. 5, the terminals 30-1 to 30-4 are connected to the LAN, and the terminal 30-1 that has activated the call control server function transmits a call control server activation notification (S501). The cycle of the call control server activation notification is a predetermined value, and is transmitted here at 10-second intervals. The other terminals 30-2 to 30-4 reset the detection timer every time the call control server activation notification is received from the terminal 30-1 (S502 to S504). Here, after the terminal 30-1 transmits the call control server activation notification twice and the other terminals 30-2 to 30-4 reset the timer (S506 to S514), the LAN connection of the terminal 30-1 is established. Suppose that it is disconnected.

  When the link between the terminal 30-1 and the LAN is broken, the call control server activation notification is stopped. If the other terminals 30-2 to 30-4 cannot receive the call control server activation notification and a timer timeout occurs, the other terminals 30-2 to 30-4 set a random number timer in the same manner as when the power is turned on (S516 to S518). Here, it is assumed that the random number timer of the terminal 30-3 has timed out earliest.

  After the timeout of the random number timer, the terminal 30-3 activates its own call control server function (S519) and transmits a call control server activation notification (S520). The terminal 30-3 registers its own terminal in its own call control server function (S521). The other terminals 30-2 and 30-4 stop the random number timer (S522, S523), and update the address of the terminal 30-3 included in the call control server activation notification as the call control server address (S524, S525). Next, the other terminals 30-2 and 30-4 transmit a registration request to the call control server function of the terminal 30-3 (S527, S528). The terminal 30-3 that has received the registration request registers with its own call control server function (S529) when registration is permitted for the terminals 30-2 and 30-4. (S530, S531).

  The terminal 30-3 periodically transmits a call control server activation notification (S532, S536), and the other terminals 30-2 and 30-4 detect each time the call control server activation notification is received from the terminal 30-3. The timer is reset (S533, S534).

In FIG. 6, when the terminal 30 is turned on and establishes a link with the network, the terminal 30 sets a random number timer for a time determined by a random number (S10). The terminal 30 determines whether a call control server search packet has been received (S11), and when YES, stops the random number timer (S12). The terminal 30 starts a later-described call control server function monitoring process (S13), and stores the address of the terminal included in the received call control server activation notification as the address of the call control server function (S14). The terminal 30 performs a process of registering its own terminal for the registered address of the call control server function (S15) and ends.

If the call control server search packet has not been received in step 11 (NO), it is determined whether the random number timer has timed out (S16). If the random number timer times out in step 16 (YES), a call control server search timer for a new predetermined time is set (S17), and a call control server search packet is transmitted (S18). In step 19, it is determined whether or not the call control server search timer has timed out (S19). If timed out (YES), the terminal 30 activates the call control server (S20) and transmits a call control server activation notification (S20). S21). The terminal 30 registers its own terminal in its own call control server function (S22), starts a call control server activation notification process described later (S23), and ends.

  If the time-out has not occurred in step 19 (NO), the terminal 30 determines whether or not a call control server search response has been received (S24). When the call control server search response is received in step 24 (YES), the terminal 30 stops the call control server search timer (S25), and proceeds to step 13.

  If the call control server search response has not been received at step 24 (NO), the terminal 30 returns to step 19 and waits for a timeout of the call control server search timer or reception of the call control server search response. Similarly, if the random number timer has not timed out in step 16, the terminal 30 returns to step 11 and waits for reception of a call control server activation notification or timeout of the random number timer.

  With reference to FIG. 7, the call control server function monitoring process in step 13 of FIG. 6 will be described. In FIG. 7, the call control server function monitoring process is a process for monitoring whether or not the call control server function is operating normally when another terminal is activating the call control server function. As shown in FIG. 6, the call control server function monitoring process is started after first receiving another call control server activation notice or receiving a call control server search response.

  In FIG. 7, the terminal 30 first sets a detection timer for a time longer than the periodically transmitted call control server activation notification interval (S301). The terminal 30 determines whether a call control server activation notification has been received (S302). If YES, the terminal 30 resets the detection timer (S303), and returns to step 302.

  When the call control server activation notification is not received in step 302 (NO), the terminal 30 determines whether or not the detection timer has timed out (S304). If the detection timer times out in step 304 (YES), the terminal 30 sets a random number timer (S305). The terminal 30 determines again whether the call control server activation notification has been received (S306A).

  When the call control server activation notification is received in step 306A (YES), the random number timer is stopped (S306B), and it is determined whether or not the address included in the call control server activation notification has been changed from the stored address (step S306B). S307). In the case of YES, the terminal 30 updates the stored call control server address to a new address (S308), registers its own terminal in the call control server function with the address as a destination (S309), and returns to step 301. . If the call control server address has not been changed in step 307, the terminal 30 returns to step 301 again.

When the call control server activation notification is not received in step 306A (NO), the terminal 30 determines whether or not the random number timer has timed out (S310). If YES, the terminal 30 activates its own call control server function (S311) and transmits a call control server activation notification (S312). The terminal 30 registers its own terminal in its own call control server (S313), starts a call control server activation transmission process described later (S314), and ends.

If the random number timer has not timed out in step 310 (NO), the terminal 30 returns to step 306A and waits until the reception of the call control server activation notification or the random number timer times out. When the detection timer has not timed out in step 304 (NO), the terminal 30 returns to step 302 and waits for reception of a call control server activation notification or timeout of the detection timer.

  With reference to FIG. 8, a process of transmitting a call control server activation notification by a terminal that activates the call control server function will be described. The call control server activation transmission process in FIG. 8 is a process started in step 23 in FIG. 6 or step 314 in FIG.

  In FIG. 8, the terminal 30 first sets a cycle timer for a predetermined time (S81). Here, the terminal 30 sets 10 seconds. Next, the terminal 30 determines whether or not a call control server search has been received (S82). If a call control server search is received (YES), a call control server search response is transmitted (S83) and the process proceeds to step 85. If no call control server search is received, the process proceeds to step 85 as it is. Next, in step 85, it is determined whether or not the periodic timer has timed out. If YES, the terminal 30 transmits a call control server activation notification (S86), and returns to step 81. If the periodic timer has not timed out in step 85 (NO), the terminal 30 proceeds to step 82 and waits until the periodic timer times out.

It is a block diagram explaining the structure of a terminal processing type | mold IP phone system. It is a functional block diagram of a terminal. It is a hardware block diagram of a terminal. It is a call control server starting terminal determination and a terminal registration sequence diagram. FIG. 10 is a sequence diagram in which another terminal activates the call control server function when the link between the terminal that activates the call control server function and the network is disconnected. It is a flowchart of the terminal of call control server starting terminal determination. It is a flowchart of the terminal of a call control server monitoring process. It is a flowchart explaining the starting notification process of a call control server.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... WAN, 12 ... LAN, 13 ... Gateway, 20 ... Terminal processing type | mold IP phone system, 30 ... Terminal, 300 ... LAN interface part, 301 ... Communication control part, 302 ... Terminal side call protocol part, 303 ... Call control server Activation determination processing unit, 304 ... call control server activation communication unit, 305 ... call control server protocol unit, 306 ... call control server confirmation communication unit, 307 ... man machine interface unit, 309 ... LAN interface unit, 310 ... central processing unit 311 ... Program storage memory unit, 312 ... Data storage memory unit, 314 ... Voice input / output unit, 315 ... Display unit, 316 ... Key input unit, 317 ... Power supply unit.

Claims (1)

An IP phone having a call control function constituting an IP phone system,
Multicasting a call control processing means for processing call control related to outgoing / incoming calls of the own IP phone or another IP phone belonging to the own IP phone, and a packet for searching for the other IP phone that is activating the call control processing means Call control activation IP phone search packet transmission means, call control activation information transmission means for multicast transmission of call control activation information to the effect that the own IP phone activates the call control processing means, and the own IP phone When the call control processing means is activated, if the call control activation IP phone search packet is received, a response packet indicating that the call control processing means is activated is transmitted. Call control activation IP phone receiving call control activation IP phone search packet or control function activation response packet from another IP phone Includes a search packet / response packet receiving means, and call control start information receiving means for receiving a call control activation information from another IP phone, a belonging request transmitting means for transmitting a belonging request command to another IP phone, a,
The call control activation IP phone search packet / response packet reception means receives call control activation IP phone from another IP phone before the call control activation IP phone search packet transmission means transmits the call control activation IP phone search packet. When the search packet is received, the call control activation IP phone search packet transmission means stops transmission of the call control activation IP phone search packet,
After the call control activation IP phone search packet transmitting means transmits the active IP phone search packet and before starting the call control process or before the call control activation information transmission means transmits the call control activation information When the call control activation IP phone search packet / response packet receiving means receives the call control activation response packet, the call control activation information transmitting means does not activate the call control processing means, and the call control activation information transmission means When transmission of information is stopped and the call control activation information receiving means receives the call control activation information from another IP phone, the attribution request transmission means transmits an attribution request command to the transmission source of the call control activation information,
When the call control activation IP phone search packet transmission means transmits the call control activation IP phone search packet , the call control activation IP phone search packet / response packet reception means is active from another IP phone. When the IP phone search packet is not received, the call control activation IP phone search packet transmission means transmits the call control activation IP phone search packet, and the call control activation information transmission means transmits the call control activation information. Before transmitting, when the call control activation IP phone search packet / response packet receiving means has not received the call control activation IP phone response packet, the call control processing means is activated , and the call control activation information An IP phone having a call control function, wherein the transmission means transmits call control activation information .

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