JP2011254222A - Call collision avoidance apparatus, call collision avoidance method, and call collision avoidance program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a state in which a line is busy and both sides are not connected when both sides call simultaneously.SOLUTION: In case that when a call collision avoidance apparatus 1 sends a call connection request signal, the call collision avoidance apparatus 1 receives a call connection request signal, the call collision avoidance apparatus 1 compares transmission destination telephone number of a call connection request signal sent from a call incoming/outgoing collision determination unit 109 with transmission origin telephone number of a received call connection request signal. When the telephone number of transmission destination is coincident with the telephone number of transmission origin, a priority determination unit 110 determines which call connection request signal has high priority and performs call connection processing based on the call connection request signal with high priority. This makes it possible to prevent a state in which a line is busy and both sides are not connected when both sides call simultaneously.

Description

  The present invention relates to a technique for avoiding a busy state when calls are made simultaneously.

  In recent years, IP telephones using the Internet Protocol (IP) technology without using an exchange are becoming mainstream. For example, there are services such as OCN dot phone provided by NTT Communications, Hikari Denwa provided by NTT East and NTT West. In IP telephones using these IP technologies, some of the functions realized in the public switched telephony networks (PSTN) network are realized on the telephone side. For example, if a call is made from Mr. A to Mr. B and from Mr. B to Mr. A at the same time and is not connected, in the exchangeable telephone service, the connection is refused on the network side. On the other hand, in the IP telephone, since the signal is not cut off on the network side, the signal reaches the telephone and the connection is rejected on the telephone side.

  In this way, the telephone is changing from the exchange type to the method using the IP technology. Patent Document 1 describes an invention in which when a call is received while talking to an IP telephone terminal, the calling telephone terminal is notified that a call is possible. Thereby, it is possible to know that a call can be made without making a call to the IP telephone terminal many times by the calling telephone terminal.

JP 2009-278438 A

  Conventionally, when calling from Mr. A to Mr. B and from Mr. B to Mr. A at the same time, there is a problem that it is not determined that the user is busy even though they want to talk to each other. In order for both parties to make a call, it is necessary to repeat the call at different timings. In addition, Patent Document 1 does not consider the case where the call cannot be made when calling each other simultaneously.

  The present invention has been made in view of the above, and an object of the present invention is to avoid a state in which calls are not being made to each other when calls are made simultaneously.

  A call collision avoidance device according to a first aspect of the present invention includes a telephone number holding means for holding a telephone number, a first telephone number indicating a destination of the first call, while sending a first call. When the second call is received when the first call is made and the calling means stored in the telephone number holding means, the second telephone number indicating the caller of the second call is set as the telephone number A receiving unit for storing in the holding unit, a number determining unit for reading out the first and second telephone numbers from the telephone number holding unit and determining whether or not the first and second telephone numbers match each other; When the number determination means determines that the first and second telephone numbers match each other, priority determination means for determining which of the first call and the second call has priority, and the priority determination means Call connection of the first or second call determined to have priority A connection processing means for processing, characterized by having a.

  A call collision avoidance method according to a second aspect of the present invention includes a step of transmitting a first call and storing a first telephone number indicating a destination of the first call in a telephone number holding unit; Storing the second telephone number indicating the originator of the second call in the telephone number holding means when the second call is received when the first call is made; and the telephone number holding means Reading out the first and second telephone numbers from the first and second steps to determine whether the first and second telephone numbers match each other, and when determining that the first and second telephone numbers match each other Determining whether to give priority to the first call or the second call, and performing a call connection process for either the first call or the second call determined to have priority. It is characterized by.

  A call collision avoidance program according to a third aspect of the present invention causes a computer to execute the call collision avoidance method.

  According to the present invention, it is possible to avoid a state in which calls are not being connected to each other when calls are made simultaneously.

It is a functional block diagram which shows the structure of the call collision avoidance apparatus in this Embodiment. It is a flowchart which shows the flow of a process of the said call collision avoidance apparatus. It is a flowchart which shows the flow of a process of a collision avoidance process. It is a sequence diagram when making a call using SIP. When making a call using SIP, it is a sequence diagram when calling at the same time. It is a figure which shows the example of an INVITE request.

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

  FIG. 1 is a functional block diagram showing a configuration of a call collision avoidance device according to the present embodiment. The call collision avoidance device 1 is a so-called telephone, and avoids a situation in which a call is not established when a call is made to the other party at the same time. 1 includes an operation unit 101, a voice input / output unit 102, a network interface 103, a call connection control unit 104, an incoming phone number holding unit 105, an incoming call connection signal storage unit 106, an outgoing phone number. A holding unit 107, an outgoing call connection signal storage unit 108, an outgoing / incoming collision determination unit 109, and a priority determination unit 110 are provided. Each unit included in the call collision avoidance device 1 may be configured by a computer including an arithmetic processing device, a storage device, and the like, and the processing of each unit may be executed by a program. This program is stored in a storage device included in the call collision avoidance apparatus 1, and can be recorded on a recording medium such as a magnetic disk, an optical disk, or a semiconductor memory, or provided through a network.

  The operation unit 101 receives an input of a telephone number, an operation such as on-hook from a user.

  The voice input / output unit 102 includes a microphone and a speaker. The voice input / output unit 102 picks up the user's voice and transmits it to the communication partner, and outputs the voice received from the communication partner. In addition, a ring tone, a ring back tone, a busy tone, and the like are output according to an instruction from a call connection control unit 104 described later.

  The network interface 103 is connected to the network and transmits and receives voice signals, call control signals, and the like.

  The call connection control unit 104 transmits and receives call control signals via the network interface 103, and performs call connection processing such as call origination processing and call arrival processing. Further, in order to avoid a collision of outgoing calls, a priority call is selected by controlling each unit based on the transmitted / received call control signals, and connection processing is performed.

  The incoming telephone number holding unit 105 holds the caller telephone number of the incoming call, and the incoming call connection signal storage unit 106 saves the call connection request signal of the incoming call.

  The outgoing telephone number holding unit 107 holds the destination telephone number of the outgoing call and saves the call connection request signal of the outgoing call.

  The outgoing / incoming call collision determination unit 109, when outgoing and incoming calls occur at the same time, the incoming telephone number of the incoming call from the incoming telephone number holding part 105 and the outgoing telephone number holding part 107 and the outgoing telephone number of the outgoing call Are read out and compared to determine whether the telephone numbers match or not.

  The priority determination unit 110 determines whether to give priority to an incoming call or an outgoing call when the outgoing / incoming collision determination unit 109 determines that the telephone numbers of the caller and the callee match. For determining the priority, a call connection request signal and a telephone number of an incoming call and an outgoing call are used. For example, the telephone number is regarded as a 10-digit number, and the priority is determined based on the magnitude.

  Next, a processing flow of the call collision avoidance device in the present embodiment will be described.

  2 and 3 are flowcharts showing the processing flow of the call collision avoidance apparatus 1.

  First, when the user operates the operation unit 101 to input a destination telephone number, the call connection control unit 104 receives a call request from the operation unit 101 to the destination (step S101).

  Then, the call connection control unit 104 stores the call destination telephone number in the call phone number holding unit 107 (step S102), sends a call connection request signal to the call destination via the network interface 103, and starts the call connection sequence. In step S103, the call connection request signal is stored in the outgoing call connection signal storage unit 108 (step S104).

  Then, the call connection control unit 104 instructs the voice input / output unit 102 to ring a ringback tone (step S105).

  Here, the call connection control unit 104 determines whether or not a call connection request signal is received from another telephone (step S106). If the call connection request signal has been received, since outgoing and incoming calls are occurring simultaneously, the process proceeds to the collision avoidance process in step S200. The collision avoidance process will be described later with reference to FIG.

  When the call connection request signal is not received, when a call arrives at the destination telephone and the handset of the destination telephone is raised, a call is established between the call collision avoidance apparatus 1 and the destination telephone. Then, voice communication is started (step S107).

  When the operation unit 101 is on-hooked or receives a call connection end signal from the destination, the call connection control unit 104 disconnects the voice communication (step S108) and instructs the voice input / output unit 102 to sound a busy tone (step S108). Step S108).

  Next, the flow of the collision avoidance process will be described.

  If it is determined in step S106 in FIG. 2 that outgoing and incoming calls are occurring simultaneously, the call connection control unit 104 interrupts the call connection sequence and starts the collision avoidance process (step S201 in FIG. 3).

  The call connection control unit 104 stores the received call connection request signal in the incoming call connection signal storage unit 106 (step S202), and stores the caller telephone number in the incoming phone number holding unit 105 (step S203).

  Then, the outgoing / incoming collision determination unit 109 compares the telephone numbers stored in the outgoing telephone number holding unit 107 and the incoming telephone number holding unit 105 to determine whether or not they match (step S204).

  If the telephone numbers do not match, the fact that the call is busy is transmitted to the caller, and the call connection sequence to the callee is resumed (step S209). When a call with the callee is established, voice communication is started (step S210). Voice communication is cut off by receiving an on-hook or call connection end signal (step S211), and a busy tone is sounded (step S212).

  On the other hand, if the call destination and the caller telephone number match, the priority determination unit 110 determines which call connection processing has priority (step S205).

  When giving priority to the received call connection request signal, the call connection control unit 104 transmits a cancel request signal for the transmitted call connection request signal (step S206), validates the received call connection request signal, and receives the call connection request. A call connection sequence based on the signal is started (step S207).

  When giving priority to the transmitted call connection request signal, the received call connection request signal is ignored and the interrupted call connection sequence is resumed (step S208).

  After the call connection is established, processing such as voice communication start and disconnection is performed (steps S210 to S212).

  Next, an embodiment in which the present invention is applied to an IP telephone network using Session Initiation Protocol (SIP) will be described.

  FIG. 4 is a sequence diagram when making a call from the telephone 1A to the telephone 1B using SIP. In FIG. 4, there is no call collision. Both the telephones 1A and 1B are telephones incorporating the call collision avoidance device according to the present embodiment.

  When the telephone number of telephone 1B is input to telephone 1A, telephone 1A transmits an INVITE request as a call connection request signal to telephone 1B (step S301). In the telephone 1 </ b> A, the telephone number of the telephone 1 </ b> B that is the destination is stored in the outgoing telephone number holding unit 107, and the transmitted INVITE request is stored in the outgoing call connection signal storage unit 108.

  The telephone set 1B that has received the INVITE request returns a 180 Ringing message to the telephone set 1A, and notifies the incoming call by ringing a ring tone (step S302). On the other hand, the telephone 1 </ b> A that has received the 180 Ringing message causes the voice input / output unit 102 to ring a ringback tone.

  When the telephone set 1B is off-hooked, a 200 OK message is transmitted to the telephone set 1A (step S303).

  The telephone 1A returns ACK (acknowledgment response) (step S304), and voice communication is started (step S305).

  When ending the voice communication, the telephone 1A transmits a BYE (call connection end signal) (step S306), and the telephone 1B receiving it returns a 200 OK message to the telephone 1A (step S307).

  The above is the normal call sequence using SIP.

  Next, a case where a call collision occurs will be described. FIG. 5 is a sequence diagram when the telephone 1A and the telephone 1B make a call at the same time.

  At the same time when the INVITE request is transmitted from the telephone 1A to the telephone 1B (step S401), when the INVITE request is transmitted from the telephone 1B to the telephone 1A (step S402), both the outgoing call and the incoming call are simultaneously generated in the telephones 1A and 1B. In each of the telephones 1A and 1B, there are two INVITE requests transmitted from the telephones 1A and 1B and an INVITE request received from another telephone.

  The call connection control unit 104 detects the presence of two separate INVITE requests and determines that the outgoing call and the incoming call are in conflict.

  When the outgoing call and the incoming call collide, the call connection control unit 104 interrupts the call connection sequence related to the outgoing call, and performs the collision avoidance process shown in FIG. Hereinafter, the processing of the telephone 1A will be specifically described. The same processing is performed for the telephone 1B.

  When transmitting the INVITE request in step S401, the telephone 1A stores the telephone number of the destination telephone 1B in the outgoing telephone number holding unit 107 and stores the transmitted INVITE request in the outgoing call connection signal storage unit 108.

  When the telephone 1A receives the INVITE request in step S402, the telephone 1A stores the telephone number of the calling telephone 1B in the incoming telephone number holding unit 105, and stores the received INVITE request in the incoming call connection signal storage unit 106. To do.

  Since outgoing and incoming calls occur at the same time, the outgoing / incoming collision determination unit 109 reads the telephone numbers from the incoming telephone number holding unit 105 and the outgoing telephone number holding unit 107, and determines whether or not they match. In the example shown in FIG. 5, both the incoming telephone number holding unit 105 and the outgoing telephone number holding unit 107 hold the telephone number of the telephone 1B, and it is determined that the telephone numbers match.

  When the call destination and the caller telephone number match, the priority determination unit 110 reads the INVITE request from each of the incoming call connection signal storage unit 106 and the outgoing call connection signal storage unit 108, and a character string in the INVITE request, for example, The priority is determined using the character string in the Call-ID field. FIG. 6 shows an example of the INVITE request. When determining the priority using the character string of the Call-ID field, the priority determination unit 110 replaces the alphabet before “@” with a number from 1 to 26, and converts the resulting character string to a decimal number. Considering it as a number, compare its magnitude and determine the priority. Alternatively, the telephone numbers may be regarded as decimal numbers and the magnitudes thereof may be compared.

  Then, the call connection sequence of a call determined to have a low priority is canceled, and the call connection sequence of a call determined to have a high priority is restarted. For example, when it is determined that the INVITE request transmitted from the telephone 1A has a low priority, the telephone 1A transmits a Cancel request to the telephone 1B and starts a call connection sequence for the INVITE request received from the telephone 1B. On the other hand, since the telephone set 1B determines that the INVITE request transmitted by itself is high in priority, the telephone set 1B ignores the INVITE request received from the telephone set 1A and performs a call connection sequence for the INVITE request transmitted by the telephone set 1B itself. Resume. In this case, the state is the same as when a call is made from the telephone 1B to the telephone 1A.

  Note that by making the priority determination rules the same for both the telephones 1A and 1B, either one of the calls can be made effective to avoid a call collision, but the communication partner telephone 1B incorporates a call collision avoidance device. If not, it is possible to avoid a call collision by determining that the telephone 1A prioritizes the call originated by the telephone 1B.

  As described above, according to the present embodiment, when the call collision avoidance device 1 transmits a call connection request signal, when the call connection request signal is received, the call arrival collision determination unit 109 transmits the call connection request signal. The destination telephone number of the received call connection request signal is compared with the source telephone number of the received call connection request signal. When the telephone number of the destination and the source matches, the priority determination unit 110 determines which call connection By deciding whether to give priority to the request signal and performing call connection processing based on the call connection request signal having a high priority, it is possible to avoid a situation where the call is not busy when calling at the same time. it can. As a result, both can be connected without imposing the trouble of calling again, and the load of re-calling can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Call collision avoidance apparatus 101 ... Operation part 102 ... Voice input / output part 103 ... Network interface 104 ... Call connection control part 105 ... Incoming call number holding part 106 ... Incoming call connection signal storage part 107 ... Outgoing telephone number holding part 108 ... outgoing call connection signal storage unit 109 ... outgoing call incoming collision determination unit 110 ... priority determination unit

Claims (5)

A telephone number holding means for holding a telephone number;
A calling means for sending a first call and storing a first telephone number indicating a destination of the first call in the telephone number holding means;
An incoming means for storing a second telephone number indicating the originator of the second call in the telephone number holding means when the second call is received when the first call is made;
Number determination means for reading out the first and second telephone numbers from the telephone number holding means and determining whether or not the first and second telephone numbers match each other;
Priority determining means for determining whether to give priority to the first call or the second call when the number determining means determines that the first and second telephone numbers match each other;
Connection processing means for performing call connection processing of either the first or second call determined to be given priority by the priority determination means;
A call collision avoidance device characterized by comprising:   2. The priority determination unit according to claim 1, wherein the priority determination unit determines a call having priority by using a call control signal of the first or second telephone number or the first or second call. Call collision avoidance device. Making a first call and storing a first telephone number indicating a destination of the first call in a telephone number holding means;
Storing a second telephone number indicating the originator of the second call in the telephone number holding means when a second call is received when the first call is made;
Reading the first and second telephone numbers from the telephone number holding means and determining whether or not the first and second telephone numbers match each other;
Determining whether to give priority to the first call or the second call when it is determined that the first and second telephone numbers match each other;
Performing a call connection process of any of the first and second calls determined to have priority;
A call collision avoidance method characterized by comprising:   The step of determining the priority call determines a priority call using a call control signal of the first or second telephone number or the first or second call. Item 4. A method for avoiding a call collision according to Item 3.   A call collision avoidance program that causes a computer to execute the call collision avoidance method according to claim 3 or 4.

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