JP4669701B2 - IP telephone exchange and incoming call control method thereof - Google Patents

Description

  The present invention acquires a destination number from a SIP (Session Initiation Protocol) message of an IP packet received by a destination in an IP telephone system that transmits voice information via an IP (Internet Protocol) network, and receives a destination logical outside port. In particular, the present invention relates to an IP telephone exchange that determines a logical external port for performing incoming call processing by specifying an incoming call and an incoming call control method thereof.

  In recent years, IP telephone systems that transmit voice information over an IP network are being used. There are several specifications for the protocol for realizing the IP telephone system, but the IP telephone service of the SIP specification is provided by various service providers.

  In a conventional telephone communication system using a general telephone line network, the number of channels for one physical line is one. However, in an IP telephone system, a physical port and a logical port are not necessarily one-to-one. A plurality of channels can be set for one physical line. However, the number of channels that can be set for one physical line depends on the usable communication band of the IP network.

  As described above, in the IP telephone system, since a plurality of channels are set for one physical line, an IP telephone exchange that performs an incoming call processing by specifying a destination telephone terminal of the received IP packet on the receiving side is provided. (For example, refer to Patent Documents 1, 2, and 3). In this IP telephone exchange, when a plurality of logical external ports used for IP are provided and an IP packet including a SIP message (call control information) is received, the destination number is determined from the SIP message of this IP packet. , The destination logical external port is identified, and the incoming processing to the logical external port designated in advance is required.

  When one logical external port is set for one telephone number, the IP telephone exchange may perform incoming processing for the logical external port corresponding to the telephone number for which an incoming request has been made. However, IP phone service may have multiple simultaneous calls (number of channels) for one phone number, and there is a service that allows incoming calls of multiple phone numbers through one logical external port. To do. When such a service is provided, it is necessary to be able to flexibly perform incoming call control designated in advance by the user.

In particular, an enterprise exchange equipped with a function corresponding to an IP telephone service often accommodates a large number of channels, and in consideration of convenience in business operation, a destination to a specified logical external port for each telephone number. It is necessary to closely control the number of simultaneous calls for each phone number.
JP 2003-18624 A JP 2003-153316 A Japanese Patent Laid-Open No. 2004-104489

  In the conventional IP telephone exchange described above, incoming call control such as setting the number of simultaneous calls, which is the number of telephone terminals that can make a call to one phone number, and limiting the number of simultaneous calls for each phone number is flexibly set. There was a problem that it was difficult.

  An object of the present invention is to provide an IP telephone exchange capable of limiting the number of simultaneous calls for each telephone number, etc., by making it possible to flexibly determine an incoming call to a logical external port designated in advance by a user. And an incoming call control method thereof.

In order to achieve the above object, an IP telephone exchange of the present invention obtains a destination number from a SIP message of an IP packet received by a destination in an IP telephone system that transmits voice information via an IP network, and receives the destination number. An IP telephone exchange that identifies a logical external port and determines a logical external port that performs incoming processing .
There a telephone number registration table for storing the logical external line port registration table in association with the ID code and the logical Rigai line ports, with each logical external port currently empty associates the telephone number and the ID code A data storage unit storing a logical external port state transition table for storing information indicating whether a call is in progress;
In accordance with a user operation, in the logical external port registration table, a setting unit that sets a logical external port for a telephone number by setting a plurality of ID codes in association with one logical external port;
An SIP message processing unit that analyzes the SIP message and obtains the telephone number information of the incoming call request destination when the SIP message is included in the IP packet received by the LAN interface;
Based on the telephone number acquired by the SIP message processing unit, the corresponding ID code is searched from the telephone number registration table in the data storage unit, and the logical external port registration table is searched based on the searched ID code. Thus, a logical external port set for the acquired telephone number is searched, and by referring to the logical external port state transition table, it is sequentially determined whether or not the searched logical external port is empty. When the logical external port that has been confirmed and searched is in an empty state, a call control unit that executes an incoming call processing to the logical external port is provided.

  According to the present invention, the logical external port registration table and the telephone number registration table for associating the telephone numbers for each logical external port whose registration can be changed by the user interface are held in the data storage unit. By referring to, the incoming call control to the logical external port designated for the telephone number for which the incoming call request has been made becomes possible. Further, it is possible to limit the number of channels that can be used simultaneously for each telephone number.

  In the logical external port registration table, a plurality of ID codes may be stored in association with one logical external port. According to the present invention, more complex incoming call control can be flexibly performed by the ID code combination method.

  As described above, according to the present invention, the telephone number registration table and the logical external port registration table are held in the data storage unit, so that the incoming call determination to the logical external port designated in advance by the user can be flexibly performed. This makes it possible to perform incoming call control such as limiting the number of simultaneous calls for each telephone number.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a system diagram showing a configuration of an IP telephone system according to a first embodiment of the invention.

  The IP telephone system according to the present embodiment is connected to a network device 11 connected to the IP network 10 via a WAN, an IP telephone switch 12 connected to the network device 11 via a LAN, and the IP phone switch 12. The plurality of telephone terminals 13 are configured.

  Next, the configuration of the IP telephone exchange 12 shown in FIG. 1 will be described with reference to FIG.

  As shown in FIG. 2, the IP telephone exchange 12 of this embodiment includes a user interface 100, a data storage unit 101, a LAN interface 102, a SIP message processing unit 103, and a call control unit 104. Yes.

  The LAN interface 102 is connected to the IP network 10 via the network device 11 and has a function of transmitting and receiving IP packets.

  The data storage unit 101 includes a telephone number registration table 200 that stores a telephone number and an ID code in association with each other, a logical external port registration table 201 that stores a logical external line port and an ID code in association with each other, and each logical external port Is stored in a logical external port state transition table 300 for storing information indicating whether the terminal is currently idle or busy.

  When the SIP message (call control information) is included in the IP packet received by the LAN interface 102, the SIP message processing unit 103 analyzes the SIP message and acquires the telephone number information of the incoming call request destination.

  As a specific method for the SIP message processing unit 103 to determine whether or not the received IP packet is a SIP message, the following method is used.

  The received IP packet includes information necessary for data communication, and includes information such as a port number that is different for each protocol. Since the SIP protocol port number uses “5060” by default, the port number of the IP packet is referred to. If the port number is “5060”, the SIP message processing unit 103 has received The IP packet is analyzed as a SIP message.

  The user interface 100 sets registration of a logical external port for a telephone number in the data storage unit 101 by an operation from the user. As a method for setting the correspondence between a telephone number and a logical external port via the user interface 100, there are a method of inputting settings from the telephone terminal 13, a method of inputting using a Web browser, and the like.

  As a method for inputting settings from the telephone terminal 13, a method is conceivable in which the telephone terminal 13 is connected to the IP telephone exchange 12 with a modular code and input is performed using a button on the telephone terminal 13. In this case, since a setting screen is displayed on the LCD of the telephone terminal 13, setting input is performed according to each setting item.

  As a method of inputting using a Web browser, the LAN interface of the IP telephone exchange 12 and a PC (personal computer) equipped with a Web browser are connected by a LAN interface so that IP communication can be performed. Setting input is performed using a Web browser. In this case, since the setting screen is displayed on the Web browser of the PC, setting input is performed according to each setting item.

  The user data storage unit 101 stores a telephone number registration table 200 using an ID as a key and a logical external port registration table 201 using a logical external port as a key.

  The call control unit 104 retrieves a corresponding ID code from the telephone number registration table 200 in the data storage unit 101 based on the telephone number acquired by the SIP message processing unit 103, and based on the retrieved ID code, a logical external line By searching the port registration table 201, the logical external port set for the acquired telephone number is searched, and the logical external line port searched is referred to by referring to the logical external port state transition table 300. Whether or not the logical external port is free is sequentially checked. If the logical external port is free, incoming processing for the logical external port is executed.

  Next, the operation of the IP telephone exchange 12 of this embodiment will be described in detail with reference to FIGS.

  The user interface 100 stores data in the telephone number registration table 200 and the logical external port registration table 201 using the ID as a key in the data storage unit 101.

  When an IP packet including a SIP message is received from the LAN interface 102 connected to the IP telephone service, the content of the SIP message received by the SIP message processing unit 103 is analyzed to obtain detailed information (step 401).

  When the telephone number “2222” is acquired from the message content (step 402), the call control unit 104 searches the telephone number registration table 200 using this telephone number as a key, and searches for a matching ID code (step 403). ).

  Here, “2” is acquired as a matched ID code as a result of the search (step 404), and the call control unit 104 searches the logical external port registration table 201 in ascending or descending order using this ID code as a key (step 404). 405), search for a matching logical external port.

  On the other hand, when the acquired telephone number is not registered in the telephone number registration table 200, the call control unit 104 executes a disconnection process (step 410).

  If “L3” is acquired as the matched logical external port as a result of the search (step 406), the call control unit 104 searches the logical external port state transition table 300 (step 407), and the logical external port is free. If it is in the state (step 408), the incoming call processing to the logical external port “L3” is executed as the destination port (step 109).

  By this method, it is possible to determine a logical external port as a destination within the IP telephone exchange 12.

  If the logical external port “L3” is in use in step 408, the logical external port registration table 201 is searched again (step 405), and the logical external port “L4” is acquired (step 406). If the logical external port is not in use (step 408), the destination is determined, and the call control unit 104 executes an incoming process to the logical external port “L4” (step 409).

  If the logical external port is in use, the logical external port registration table 201 is searched again (step 105). If the logical external ports “L3” and “L4” are in use, they match. It is determined that there is no logical external line port to be performed (step 406), and disconnection processing is executed (step 410).

  This method makes it possible to limit the number of incoming channels for each telephone number in the IP telephone exchange 12 on the receiving side.

  That is, inside the terminal, the telephone number “1111” can be received to the logical external ports “L1” and “L2”, and the number of channels can be limited to two. The telephone number “2222” can be received at the logical external ports “L3” and “L4”, and the number of channels can be limited to two.

  According to the IP telephone exchange 12 of the present embodiment, the logical external port registration table 201 and the telephone number registration table 200 for associating telephone numbers for each logical external port whose registration can be changed by the user interface 100 are held in the data storage unit 101. Therefore, the call control unit 104 can control the incoming call to the logical external port designated for the telephone number for which the incoming call is requested by referring to these tables 200 and 201. Further, it is possible to limit the number of channels that can be used simultaneously for each telephone number. As a result, convenience as a telephone system can be improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.

  3 and 6, in this embodiment, instead of the logical external port registration table 201 and the telephone number registration table 200 shown in FIG. 3, a logical external port registration table 501 telephone number registration table 500 shown in FIG. Is different. The telephone number registration tables 200 and 500 are tables having the same contents. That is, the logical external port registration table 501 in the present embodiment is different in that a plurality of ID codes are stored in association with one logical external port.

  Referring to FIG. 6, for example, in the logical external port “L1”, “1” is associated with ID-a and “3” is associated with ID-b, so that telephone numbers “1111” and “3333” are associated with each other. Can be received.

  By expanding the logical external line registration table in the IP telephone exchange 12, it is possible to receive incoming calls with a plurality of telephone numbers for one logical external port. That is, it can be expanded as in the logical external port registration table 501, and more precise incoming call control can be performed depending on the combination of ID codes.

1 is a system diagram showing a configuration of an IP telephone system according to a first embodiment of the present embodiment. It is a block diagram which shows the structure of the IP telephone switch 12 of the 1st Embodiment of this invention. 5 is a diagram illustrating an example of a logical external line port registration table 201 and a telephone number registration table 200. FIG. 5 is a diagram showing an example of a logical external port state transition table 300. It is a flowchart which shows operation | movement of the IP telephone switch 12 of FIG. It is a figure which shows an example of the logical external port registration table 501 and the telephone number registration table 500 in the IP telephone system of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 IP network 11 Network equipment 12 IP telephone exchange 13 Telephone terminal 100 User interface 101 Data storage part 102 LAN interface 103 SIP message processing part 104 Call control part 200 Telephone number registration table 201 Logical outside line port registration table 300 Logical outside line port state transition table 401-410 Step 500 Telephone number registration table 501 Logical external port registration table

Claims (6)

In an IP telephone system that transmits voice information over an IP network, a destination number is obtained from a SIP message of an IP packet received by the destination side, a destination logical outside port is specified, and a logical outside port for performing incoming processing is determined. an IP telephone exchange to,
There a telephone number registration table for storing the logical external line port registration table in association with the ID code and the logical Rigai line ports, with each logical external port currently empty associates the telephone number and the ID code A data storage unit storing a logical external port state transition table for storing information indicating whether a call is in progress;
In accordance with a user operation, in the logical external port registration table, a setting unit that sets a logical external port for a telephone number by setting a plurality of ID codes in association with one logical external port;
An SIP message processing unit that analyzes the SIP message and obtains the telephone number information of the incoming call request destination when the SIP message is included in the IP packet received by the LAN interface;
Based on the telephone number acquired by the SIP message processing unit, the corresponding ID code is searched from the telephone number registration table in the data storage unit, and the logical external port registration table is searched based on the searched ID code. Thus, a logical external port set for the acquired telephone number is searched, and by referring to the logical external port state transition table, it is sequentially determined whether or not the searched logical external port is empty. If the logical external port that has been confirmed and found is idle, a call control unit that executes an incoming call process to the logical external port;
IP telephone switchboard with   The IP telephone exchange according to claim 1, wherein the setting unit acquires a logical external port for a telephone number input to a telephone terminal by a user and sets the acquired logical external port for the telephone number.   The IP telephone exchange according to claim 1, wherein the setting unit acquires a logical external port for a telephone number input to a Web browser by a user and sets the acquired logical external port for the telephone number. In an IP telephone system that transmits voice information over an IP network, a destination number is obtained from a SIP message of an IP packet received by the destination side, a destination logical outside port is specified, and a logical outside port for performing incoming processing is determined. An incoming call control method for an IP telephone exchange,
In accordance with the user's operation, in the logical external port registration table that stores the ID code and the logical external port in association with each other, by setting a plurality of ID codes in association with one logical external port, the logic for the telephone number is set. Setting up an external port;
If the SIP message is included in the IP packet received by the LAN interface, analyzing the SIP message and obtaining the telephone number information of the incoming call request destination;
Searching for a corresponding ID code from a telephone number registration table in which a telephone number and an ID code are stored in association with each other based on the acquired telephone number;
Based on the retrieved ID code, the logical phone port registration table that stores the ID code and the logical external port set by the setting unit in association with each other is searched to set the acquired telephone number. Searching for a logical external port,
Whether or not the searched logical external port is in an empty state by referring to the logical external port state transition table storing information indicating whether each logical external port is currently in an empty state or in a call Are sequentially checked, and when the retrieved logical external port is in an empty state, a step of executing incoming processing to the logical external port;
An incoming call control method for an IP telephone exchange comprising: 5. The incoming call control of the IP telephone exchange according to claim 4 , wherein in the setting step, the logical external port corresponding to the telephone number input by the user to the telephone terminal is acquired, and the acquired logical external port is set to the telephone number. Method. 5. The incoming call control of the IP telephone exchange according to claim 4 , wherein in the setting step, a logical external port corresponding to a telephone number input by a user to a Web browser is acquired, and the acquired logical external port is set to the telephone number. Method.

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