JP5040443B2 - IP phone terminal with server detour direct call function - Google Patents

Description

  The present invention works in conjunction with a call control server that controls incoming / outgoing IP (Internet Protocol) telephones via a WAN (Wide Area Network) and a LAN (Local Area Network). The present invention relates to an IP telephone terminal.

  Conventionally, when a server of IP-PBX (Internet Protocol Private Branch eXchange: an apparatus and software for performing circuit switching of an IP telephone terminal in an IP network) cannot be used due to a failure or the like, Means for switching the operation, or means for performing call connection via a bypass transmission GW (Gateway) set in advance have been taken.

In addition, for this problem, correspondence information between the telephone number and the IP address is recorded in advance in the extension telephone, and when the server cannot be used due to a failure or the like, based on this correspondence information, the destination directly A method of recognizing an IP address and making a call to the IP address has been taken. For example, Patent Document 1 discloses an invention of an IP telephone network and a call detour method used therefor.
JP 2005-39565 A

  However, in the conventional method, when each system device is applied by DHCP (Dynamic Host Configuration Protocol: a protocol that automatically assigns necessary information such as an IP address to a computer temporarily connected to the Internet) or a GW for bypass transmission When the number of IP telephone terminals is increased / decreased, the IP address assignment changes, so that the correspondence information needs to be updated to the latest state at any time.

  In addition, this correspondence information (table) is also inconvenient because it is necessary to secure a huge memory capacity when the telephone numbers and IP addresses of all terminals existing in the system are stored, and the terminal cost increases. .

  An object of the present invention is to realize detour transmission by direct IP address transmission without switching the operation to a spare server in the event of a server failure.

The IP telephone terminal of the present invention is linked to a call control server that controls outgoing / incoming calls of IP telephones via WAN and LAN, and the call control server or counterpart terminal when there is an outgoing call or incoming call through the call control server An IP address storage means for storing the IP address of the caller terminal or the callee terminal notified from the telephone number in association with the telephone number of the partner terminal, and directly to the partner terminal by the IP address of the partner terminal without going through the call control server An IP telephone terminal having an IP address direct call control means for making a call and a call control server monitor means for monitoring an abnormality of the call control server, and making a call request to the call control server by designating a telephone number of a partner terminal When the call control server monitoring means detects an abnormality of the call control server, the IP address direct call control means Find the IP address of the remote terminal corresponding to the telephone number stored in the address storage means, said originating directly retrieved IP address, IP address information corresponding to the telephone number in the IP address storing means exist If not, the IP address corresponding to the telephone number is inquired of the IP address information corresponding to the telephone number from another terminal that has been determined according to a predetermined rule from its own outgoing / incoming call history, and the other terminal that has made the inquiry is set to the telephone number If there is no corresponding IP address information, an IP address inquiry means for determining a next inquiry destination candidate according to a predetermined rule from the call origination / incoming history and inquiring information relating to the IP address to the determined other terminal; When an inquiry about an IP address corresponding to a telephone number is received from another terminal, the I And wherein said IP address if there is a corresponding IP address to the telephone number further organic and IP address reply means for replying to said other terminal in stored in the address storage means.
Further, the IP telephone terminal of the present invention further operates using the first communication protocol when making and receiving calls via the call control server, and when making and receiving calls without going through the call control server, It operates by switching to the second communication protocol.

  According to the present invention, by storing IP address information in association with the telephone number of the outgoing / incoming call history of the IP telephone terminal, it is possible to directly send and connect to the IP address of the partner terminal in the event of a server failure that has not been possible in the past. Is possible.

  In addition, the interface with the call control server when making / receiving calls through the call control server is not a standard protocol such as SIP (Session Initiation Protocol: one of the call control protocols used in Internet telephones), but at the time of failure. Switch the terminal operation to a standard protocol such as SIP that can be directly connected in the case of a system configuration in which extension terminals cannot be interconnected with the server access protocol when directly sending to the IP address of the partner terminal without going through the call control server To realize call connection. For this reason, a server installed as a spare in the event of a failure becomes unnecessary.

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

  FIG. 1 is a system configuration diagram showing an embodiment of the present invention, which includes a telephone terminal having an IP communication function and a call control server 3, and a server and PSTN for controlling IP telephone terminals 1-a to 1-c. (Public Switched Telephone Networks: public subscriber telephone network; “public telephone switched network”). A call is established with the partner terminal 6 via the WAN 5.

  FIG. 2 is a configuration diagram of the IP telephone terminal 1 in FIG. 1. The control unit 12 controls the whole, the call control unit 11 establishes a call, the IP address direct transmission unit 17 that can perform IP address transmission in the event of a server failure, the same The IP address information of another IP telephone terminal 1 connected on the LAN 2 is stored, the other terminal inquiry unit 15 that inquires when the IP address of the partner terminal 6 is not known at the time of a server failure, and the IP address when an inquiry comes from another terminal An IP address notification processing unit 16 for processing information notification, a search information control unit 14 for controlling a search function, a history memory unit 13 for storing outgoing / incoming history, and a LAN interface unit 18 connected to the LAN 2 are provided.

  FIG. 3 is an internal configuration diagram of the history memory unit 13 in FIG. 2, and shows a configuration in which the IP address information 133 obtained at the time of establishing a call is recorded in correspondence with the telephone number 132 and the time 131.

  FIG. 4 is a series of flowcharts when the IP telephone terminal 1 in FIG.

  When the IP telephone terminal 1 receives an incoming call from another terminal (S401), the incoming call processing is performed (S407), and the partner IP address information obtained at that time is stored in the history memory unit 13 (S408). When there is an IP address inquiry from another terminal (S402), the history memory unit 13 of the own terminal is searched (S409), and when there is an IP address corresponding to the telephone number of the inquiry (S411), the inquiry side terminal The IP address is transmitted to (S410). If the IP address does not exist, information without an IP address is transmitted to the inquiry side terminal (S412).

  If there is no inquiry from another terminal and there is no server failure after the transmission (S403) (S404), the telephone number is transmitted via the call control server (S413), and the normal operation is performed. The partner IP address information obtained at this time is stored in the history memory unit 13 (S416).

  When there is a server failure (S404), the history information stored in the IP telephone terminal 1-a is searched (S405), and when the IP address of the other party to be transmitted exists (S406), the IP address A call is made directly to the partner terminal (S418).

  At this time, if the telephone number and IP address of the target other party terminal are not present in the own outgoing / incoming call history, an IP address inquiry is transmitted to another IP telephone terminal 1 (S414), and another IP telephone is sent. When the IP address is present in the reply from the terminal (S415), direct transmission is made to the received IP address (S418). If it does not exist, it is determined whether there is a next candidate inquiry destination IP telephone terminal (S417), and if it exists, the same operation as above is repeated. If there is no next candidate, the call fails, and BT (Busy Tone) is sent to end the call.

  FIG. 5 is a sequence diagram of an operation for storing the IP address of the called party terminal 6 when making a call from the calling IP telephone terminal 1-a in FIG. The IP of the partner terminal 6 added to the Ringing 180 signal (S506) transmitted from the call control server in the call establishment protocol using SIP with the partner terminal 6 when making a call from the IP telephone terminal 1-a in FIG. An operation for storing the address information in the history memory unit 13 in association with the telephone number is performed (S514) to establish a call.

  FIG. 6 is a sequence diagram of an operation for storing the IP address of the caller counterpart terminal 6 when receiving a call to the callee IP telephone terminal 1-a in FIG. In the call establishment protocol using SIP with the partner terminal 6 when making a call to the IP telephone terminal 1-a in FIG. 1, the partner terminal added to the INVITE signal (S603) transmitted from the call control server 3 The operation of storing the IP address information in the history memory unit 13 in association with the telephone number is performed (S604).

  FIG. 7 is a sequence diagram of a sequence of operations for making a call when there is a destination IP address stored in the own history (S702) in the event of a server failure from the originating IP telephone terminal 1-a in FIG. . The IP telephone terminal 1-a transmits a telephone number via the call control server 3, but a telephone call cannot be established due to a server failure (S703). At this time, as a method of determining that a server failure has occurred, when a telephone number transmission (INVITE) is transmitted in S701, a timer for a predetermined time (for example, 3 seconds) is started, and 100 TRYING before the timeout occurs. If a server failure is not received, it is determined that a server failure has occurred. For this reason, the IP telephone terminal 1-a searches the own call history to see if there is a telephone number to be transmitted. If there is, the IP telephone terminal 1-a directly contacts the receiving terminal 6 with the IP address stored in association with the telephone number. An IP address is transmitted (S704).

  FIG. 8 shows that the IP address desired to be transmitted in the case of a server failure from IP telephone terminal 1-a in FIG. 1 (S801) is not stored in its own history (S803), and other IP telephone terminals 1-b or 1-c. FIG. 5 is a series of sequence diagrams of an operation of searching for the history of another IP telephone terminal by searching (S804, S813), obtaining the destination IP address of the counterpart terminal 8 from the other IP telephone terminal 1-c, and making a call. The IP telephone terminal 1-a makes a telephone number transmission via the call control server 3 (S802), but a call cannot be established due to a server failure. Therefore, the IP telephone terminal 1-a searches for the telephone number and IP address value to be transmitted from the latest one of its own outgoing / incoming history.

  If the target telephone number and IP address value do not exist (S803), the IP telephone terminal 1-b recorded most recently in the history of the IP telephone terminal 1-a is searched (S804), and the IP telephone terminal 1-b is inquired about the IP address value corresponding to the target telephone number.

  The IP telephone terminal 1-b that has received the inquiry searches the history information of its own terminal (S805). If the IP address information of the other party to be transmitted is not accumulated, the IP telephone terminal 1-b transmits that there is no IP address information to the IP telephone terminal 1-a (S812).

  When the IP telephone terminal 1-a finds that the inquiry destination terminal does not have IP address information, the IP telephone terminal 1-a searches for the next candidate IP telephone terminal 1-c in its own history (S813), and makes an inquiry to the IP telephone terminal 1-c. Do.

  The IP telephone terminal 1-c that has received the inquiry searches the history information of its own terminal (S814). If the IP address information of the destination to be transmitted is stored, the IP telephone terminal 1-c sends the IP address information to the IP telephone terminal 1-a (S806).

  The IP telephone terminal 1-a transmits the IP address directly to the partner terminal 6 based on the sent IP address information (S807).

  In the present embodiment, for the sake of simplicity, the partner terminal search method has been described based on the IP address information. However, the present application is not limited to this. For example, the gateway address, the caller's router address, etc. may be stored as IP address information together with the IP address according to the network.

  In this embodiment, the IP address value corresponding to the target telephone number is searched with reference to the outgoing / incoming call history, but the present application is not limited to this. For example, a telephone number / IP address correspondence table independent of the history memory unit 13 may be created for each outgoing / incoming call.

FIG. 1 is a system configuration diagram showing an embodiment of the present invention. FIG. 2 is a configuration diagram of the IP telephone terminal 1-a in FIG. FIG. 3 is an internal configuration diagram of the history memory unit 13 in FIG. FIG. 4 is a sequence diagram showing a series of operations of the present invention. FIG. 5 is a sequence diagram of an operation for storing the IP address of the partner terminal 6 at the time of transmission from the IP telephone terminal 1-a in FIG. FIG. 6 is a sequence diagram of an operation for storing the IP address of the partner terminal 6 at the time of an incoming call to the IP telephone terminal 1-a in FIG. FIG. 7 is a sequence diagram of a sequence of operations for searching for a destination IP address stored in the self-history at the time of server failure from IP telephone terminal 1-a in FIG. FIG. 8 is a series of sequence diagrams of operations for searching for a destination IP address by making an inquiry to another terminal in the event of a server failure from IP telephone terminal 1-a in FIG.

Explanation of symbols

1-a IP telephone terminal 1-b IP telephone terminal 1-c IP telephone terminal 2 LAN
3 Call control server 4 External gateway 5 WAN
6 partner terminal 11 call control unit 12 control unit 13 history memory unit 14 search information control unit 15 other terminal inquiry unit 16 IP address notification processing unit 17 IP address direct transmission unit 18 LAN interface unit 131 time 132 telephone number 133 IP address

Claims (2)

In conjunction with a call control server that controls incoming and outgoing IP telephones via WAN and LAN,
IP address storage for storing the IP address of the outgoing or incoming call partner terminal notified from the call control server or the counterpart terminal when the call is made or received via the call control server in association with the telephone number of the counterpart terminal An IP telephone terminal comprising: means; an IP address direct call control means for directly making a call to the counterpart terminal by the IP address of the counterpart terminal without going through the call control server; and a call control server monitoring means for monitoring an abnormality of the call control server Because
If the call control server monitoring means detects an abnormality in the call control server when a call request is made to the call control server by designating the telephone number of the other terminal, the IP address direct call control means Search for the IP address of the partner terminal corresponding to the telephone number stored in the storage means, and directly send with the searched IP address ,
When the IP address information corresponding to the telephone number does not exist in the IP address storage means, the IP address corresponding to the telephone number corresponds to the telephone number for another terminal determined according to a predetermined rule from its own call history The IP address information to be inquired is determined, and when the other terminal inquired does not have the IP address information corresponding to the telephone number, the next inquiry destination candidate is determined according to a predetermined rule from the own outgoing / incoming call history, and the determined When an IP address inquiry means for inquiring information related to an IP address to another terminal and an IP address inquiry corresponding to the telephone number from another terminal, the telephone number is stored in the IP address storage means. IP that returns the IP address to the other terminal if there is a corresponding IP address IP telephone terminal, characterized in that the further organic and dress reply means. The IP telephone terminal according to claim 1,
When making / receiving calls via the call control server, it operates with the first communication protocol, and when making / receiving calls without going through the call control server, it operates by switching to the second communication protocol. A featured IP phone terminal.

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