KR101288344B1 - System and method for notifying possibility of call in mobile communication network - Google Patents

System and method for notifying possibility of call in mobile communication network Download PDF

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Publication number
KR101288344B1
KR101288344B1 KR1020060074570A KR20060074570A KR101288344B1 KR 101288344 B1 KR101288344 B1 KR 101288344B1 KR 1020060074570 A KR1020060074570 A KR 1020060074570A KR 20060074570 A KR20060074570 A KR 20060074570A KR 101288344 B1 KR101288344 B1 KR 101288344B1
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South Korea
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call
called terminal
terminal
state
status notification
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KR1020060074570A
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Korean (ko)
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KR20080013272A (en
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최필규
강재현
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에스케이텔레콤 주식회사
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Priority to KR1020060074570A priority Critical patent/KR101288344B1/en
Publication of KR20080013272A publication Critical patent/KR20080013272A/en
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Publication of KR101288344B1 publication Critical patent/KR101288344B1/en

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Abstract

According to the present invention, when a call connection is not made according to a state of a called terminal, when the called terminal state is restored to a callable state, a call available state in a mobile communication network that enables the calling terminal and the called terminal to notify a callable state. A notification system and method, comprising: receiving a call connection from a calling terminal to a called terminal from a calling terminal and requesting location information of the called terminal to a home location register in which the called terminal is registered; As a result of determining the current state of the called terminal by the home location register, if the called terminal is unable to connect to either of the power off state and the busy state, the call availability state notification service is provided to the call availability state notification server. Requesting process; Monitoring, by the home location register, whether the called terminal is restored to a callable state and reporting that the called terminal is restored to a callable state when the called terminal is restored to a callable state; and; Preferably, the call availability status notification server includes a step of transmitting a call availability status notification message to the calling terminal and the called terminal with a time difference.

Incoming call, power off, called terminal, call availability status

Description

SYSTEM AND METHOD FOR NOTIFYING POSSIBILITY OF CALL IN MOBILE COMMUNICATION NETWORK}

1 is a view schematically showing the configuration of a mobile communication network including a call availability status notification system according to an embodiment of the present invention.

2 is a flowchart illustrating a call availability status notification method in a mobile communication network according to an embodiment of the present invention.

3 is a flowchart illustrating a call availability status notification method in a mobile communication network according to another embodiment of the present invention.

DESCRIPTION OF THE REFERENCE SYMBOLS

10/30. Originating / receiving terminal, 15/35. Originating / receiving base station,

20/40. Origin / called base station controller, 25/45. Called / called MSC,

50.HLR, 60.SMSC,

70. Call availability report server

The present invention relates to a callable state notification system and method in a mobile communication network. Particularly, when a call connection is not made according to a state of a called terminal, the called terminal state is restored to a callable state. The present invention relates to a call availability state notification system and method in a mobile communication network.

In the mobile communication network, when the called terminal requesting a call connection is busy or the call is not made due to the power off, conventionally, the called terminal is busy or powered off so that the call cannot be connected. It provides an automatic reply service to connect to a mailbox.

However, as described above, when a voice message or a call number is left to the called terminal using an answering machine, there is a problem that the called party who has confirmed the voice message or call number has to wait for the call.

In addition, when the voice message or the call number is not left, there is a problem that the calling subscriber continues to retry the call until the call is made to the called party.

In order to solve the above problems, conventionally, when a called terminal requesting a call connection by the calling terminal is busy or a call is not made due to power off, the called terminal monitors the state of the called terminal to make a call. When recovering to the possible state, a technology has been developed and used to make a call by simultaneously transmitting a call capable message indicating that the called terminal is in a callable state to the calling terminal and the called terminal.

However, as described above, when the callable message is simultaneously transmitted to the calling terminal and the called terminal, the calling party and the called subscriber who have received the callable message at about the same time have a high probability of requesting a call connection at the same time. There is a problem that frequently occurs when the call connection is not made.

The present invention has been made to solve the above-mentioned problems, the state of the called terminal is restored to the callable state, when sending a call available message to the calling terminal and the called terminal, the call available message to the calling terminal and the called terminal with a time difference It is an object of the present invention to provide a system and a method for notifying of a call availability state in a mobile communication network, by reducing the probability of an originating subscriber and a called party requesting a call connection at about the same time.

In the mobile communication network according to an embodiment of the present invention for achieving the above object, the call availability status notification system, with a time difference between the calling terminal and the called terminal by a call availability status notification message indicating a call availability state of the called terminal. A call availability status notification server for transmitting; When the calling terminal attempts to connect to the called terminal, when the called terminal is identified as one of a power off state and a busy state, and a call connection is impossible, a call availability status notification service is provided to the call availability notification server. A home position for monitoring the state of the called terminal through the called MSC and when the called terminal is restored to the callable state, reporting the called terminal to the call availability status notification server that the called terminal has been restored to the callable state. A register; And a short message center for converting the call availability status notification message received from the call availability status notification server into a short message and transmitting the message to the call / calling terminal.

Furthermore, when the call availability status notification server receives a report from the home location register that the called terminal has been restored to a call availability state, the call availability status notification server transmits a call availability status notification message to the calling terminal, and after the preset time elapses, the incoming call is received. It is preferable to transmit a call availability status notification message to the terminal.

When the call availability report server receives a report from the home location register that the called terminal has been restored to a call availability state, the call availability status notification server transmits a call availability report to the calling terminal, from the home location register within a preset time. If the originating terminal does not receive a report that the call connection is requested to the called terminal, it is preferable to transmit a call availability status notification message to the called terminal.

The home location register reports the called terminal to the available state notification server to the callable state, and then the calling terminal requests a call connection from the calling terminal to the called terminal. If there is a request for the location information, it is preferable to report to the call availability status notification server that the calling terminal has requested a call connection to the called terminal.

On the other hand, the call availability status notification method in a mobile communication network according to an embodiment of the present invention, the call from the originating terminal to the call from the calling terminal to the destination terminal, the called terminal to the home location register where the called terminal is registered; Requesting location information of the terminal; As a result of determining the current state of the called terminal by the home location register, if the called terminal is unable to connect to either of the power off state and the busy state, the call availability state notification service is provided to the call availability state notification server. Requesting process; Monitoring, by the home location register, whether the called terminal is restored to a callable state and reporting that the called terminal is restored to a callable state when the called terminal is restored to a callable state; and; Preferably, the call availability status notification server includes a step of transmitting a call availability status notification message to the calling terminal and the called terminal with a time difference.

In addition, the process of transmitting a call availability status notification message to the calling terminal and the called terminal may include a call from the home available register to the calling terminal from the call possibility status notification server that has been reported that the called terminal has been restored to a callable state. Transmitting a possible status notification message; After transmitting the call availability status notification message to the calling terminal, if the predetermined time is exceeded, it is preferable to include a step of transmitting a call availability status notification message to the called terminal.

The transmitting of the call availability status notification message to the calling terminal and the called terminal may include: calling from the home location register to the calling terminal by the call possibility status notification server that is reported that the called terminal has been restored to a callable state. Transmitting a possible status notification message; Determining whether the calling terminal requests a call connection to the called terminal within a preset time; If the originating terminal does not request a call connection to the called terminal within a predetermined time as a result of the determination, it is preferable to include the step of transmitting a call availability status notification message to the called terminal.

Furthermore, the process of transmitting the call availability status notification message to the calling terminal and the called terminal may include requesting a call connection with the called terminal according to a key operation of the calling subscriber who confirmed the call availability status notification message. Requesting location information of the called terminal from the calling exchange to the home location register; The home location register preferably further comprises the step of reporting to the call availability state notification server that the calling terminal has requested a call connection to the called terminal.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the system and method for notification of call availability in a mobile communication network according to an embodiment of the present invention.

1 is a road schematically showing the configuration of a mobile communication network including a call availability state notification system according to an embodiment of the present invention, a call / call terminal 10/30, a call-call base station 15/35, Calling / Calling Base Station Controller (20/40), Calling / Calling Mobile Switching Center (MSC) (25/45), Home Location Register (HLR) (50), Short Message Service Center (SMS) (60), Call A possible status notification server 70 is provided.

In such a configuration, the originating / receiving terminal 10/30 makes a mobile phone call by making a call to the other party through the mobile communication network.

The originating / receiving side base station 15/35 is in charge of communicating with the originating / receiving terminal 10/30 using a wireless section, and transmits or receives a radio signal to the originating / receiving terminal 10/40. Receives a radio signal from the terminal 10/30.

The calling / called base station controller 20/40 controls the calling / called base station 15/35 between the calling / called base station 15/35 and the calling / called MSC 25/45, and wirelessly. It manages resources and performs a handoff function to maintain the continuity of the call while the subscriber is mobile.

The calling / calling MSC 25/45 stores the location and service profile of the calling / calling terminal 10/40, and performs an exchange function to establish a call path between the calling terminal 10 and the called terminal 30. Connect to make a call.

The HLR 50 stores the location information of the calling / calling terminal 10/40 through the location registration of the calling / calling terminal 10/40 and provides all the permanent information of the mobile communication terminal necessary to provide a mobile communication service. Information (terminal information (MIN, ESN), subscriber information, additional service information of the subscriber, etc.), and if the destination terminal 30 is not available, the code for the announcement to provide to the calling terminal 10 It is storing information.

In addition, the HLR 50, when the caller terminal 10 attempts to connect to the caller terminal 30, when the caller terminal 30 is powered off or busy and the call is not connected, the call availability status notification server Requesting for the call availability status notification service by transmitting identification information (MIN) of the calling terminal 10 and the called terminal 30 to 70, the status of the called terminal 30 through the called MSC 45; When the receiver terminal 30 is restored to the callable state by monitoring the call, the call state notification server 70 reports that the receiver terminal 30 is restored to the callable state.

In addition, the HLR 50 reports that the called terminal 30 is restored to a callable state to the callable state notification server 70, and then the calling terminal 10 attempts to make a call to the called terminal 30 to make a call. When there is a location information request for the called terminal 30 from the side MSC 25, the call possibility status notification server 70 notifies that the calling terminal 10 requests the call terminal 30 to call.

The SMSC 60 converts the call availability status notification message received from the call availability status notification server 70 into an SMS message and transmits it to the calling / receiving terminal 10/30.

The call availability status notification server 70 is connected to the HLR 50 and the SMSC 60 so as to notify the calling terminal 10 of the call availability status at the calling terminal 10 and the called terminal 30 with a time difference. In charge of control.

That is, the call availability status notification server 70 receives identification information (MIN) of the calling terminal 10 and the called terminal 30 from the HLR 50 and receives a call availability status notification service, and then the HLR 50. If the receiving terminal 30 is reported that the call back to the call-enabled state, and transmits the call availability status notification message to the calling terminal 10 through the SMSC (60), after the preset time has passed the called terminal 30 When the call availability status notification message is transmitted to the caller, or the HLR 50 reports that the called terminal 30 has been restored to the call availability state, the call availability status notification message is transmitted to the calling terminal 10 through the SMSC 60. Thereafter, if the caller terminal 10 does not receive a report that the call terminal 10 has requested a call connection from the HLR 50 within the preset time, the call availability status notification message is transmitted to the called terminal 30.

Meanwhile, the call availability status notification server 70 may receive and store a called number for receiving a service from a service subscriber, and may provide a service only for the set called number.

In addition, the call availability status notification server 70 receives the notification time information from the service subscriber, and when the calling subscriber attempts to call the destination number and the call is not connected, the call terminal state notification server 70 of the called terminal 30 only receives the set time from the attempted time of the call. You may also be informed of the status.

2 is a flowchart illustrating a call availability status notification method in a mobile communication network according to an embodiment of the present invention.

First, the originating terminal 10 performs location registration according to the movement. The originating MSC 25 transmits a location registration request message to the HLR 50 according to the location registration of the originating terminal 10, and the HLR. 50 includes the additional service information of the calling terminal 10 requesting the location registration in the location registration request response message and transmits it to the calling MSC 25, and the calling MSC 25 sends the additional service information for the calling terminal. Will be temporarily saved.

Subsequently, when the calling terminal 10 attempts to make a call connection with the called terminal 30 (S10), the calling MSC 25 transmits the called terminal 30 to the HLR 50 in which the called terminal 30 is registered. A location information request message for requesting location information is transmitted (S12).

When the calling party MSC 25 transmits the location information request message to the HLR 50 in step S12, the additional service information of the calling terminal 10 provided from the HLR 50 is registered when the location of the calling terminal 10 is registered. Include in location information request message and send.

The HLR 50, which has received the location information request message from the calling MSC 25 through the process S12, sets up a call connection between the calling terminal 10 and the called terminal 30. Determine the state (S14).

In the process S14, the HLR 50 registers the position through the HLR 50 when the terminating terminal 30 is powered off, so that it is possible to determine the power-off state of the terminating terminal 30. And, in response to the route information request message transmitted to the destination MSC 45 in response to receiving the location information request message from the source MSC 25, the destination MSC 45 sends the call to the HLR 50. It is possible to determine that the called terminal 30 is currently in a call state based on the state information of the terminal 30.

As a result of the determination in step S14, when the terminating terminal 30 is powered off or the call connection with the terminating terminal 30 fails because the terminating terminal 30 is in a call, it is received from the calling MSC 25. On the basis of the additional service information of the calling terminal 10 included in the location information request message, the HLR 50 recognizing that the calling terminal 10 is a callable status notification service subscriber is sent to the call availability status notification server 70. The called terminal 30 transmits a call availability status notification request message including information indicating that a power off state or a busy state is requested, and requests a call availability status notification service (S16 and S18).

In the process S18 described above, the call availability status notification request message transmitted by the HLR 50 to the call availability status notification server 70 may include identification information (MIN) of the called terminal 30, which should track the call availability status, and call. Preferably, the identification information MIN of the calling terminal 10 and the called terminal 30 to be notified of the status is included.

The call availability status notification server 70 having received the call availability status notification request message from the HLR 50 through the process S18 identifies the originating terminal 10 and the called terminal 30 received from the HLR 50. Store the information (MIN) in the database.

On the other hand, in step S14, the HLR 50 confirms that the call connection with the called terminal 30 is impossible, in response to the location information request message, the caller sends a response message including the announcement code information according to the state of the called terminal. The MSC 25 transmits the announcement message corresponding to the announcement message code information included in the response message received from the HLR 50 to the calling terminal 10.

As described above, after transmitting the announcement according to the state of the called terminal 30, the call is terminated according to the call termination request received from the calling terminal 10.

Thereafter, the HLR 50 monitors whether the called terminal 30 is restored to a callable state (S20), and when the called terminal 30 is restored to a callable state (S22), the call available state notification server 70 The receiver terminal 30 reports that the call has been restored to the available state (S24).

In the process S20, when the receiver terminal 30 is powered off, the HLR 50 receives the power from the receiver terminal 30 based on the location registration performed by the receiver terminal 30 according to the power. You will be able to recognize that the call has been restored.

When the called terminal 30 is busy, the terminal MSC 45 monitors the state change of the called terminal 30 to report when the called terminal 30 recovers to the callable state, and the HLR ( When the called MSC 45 monitors the state change of the called terminal 30 according to the request of 50) and the called terminal 30 terminates the call and is released from the busy state, the called terminal 30 is sent to the HLR 50. ) And the HLR 50 receives a report from the called MSC 45 that the called terminal 30 has been restored to the available state, and recognizes that the called terminal 30 has been restored to the available state. It becomes possible.

The call availability status notification server 70 that has been reported from the HLR 50 that the called terminal 30 has been restored to the available call state through the process S24 may call the calling terminal 10 retrieved from the database as identification information of the called terminal 30. On the basis of the identification information (MIN) of the call through the SMSC (60) transmits a call availability status notification message indicating that the terminating terminal 30 has been restored to the available state (S26).

The calling party status notification message transmitted to the calling terminal 10 in step S26 includes the identification information (MIN) of the called terminal 30, and the calling subscriber who checks the calling status notification message is included in the call availability status notification message. It is preferable to be able to immediately perform a call connection by using the identification information (MIN) of the called terminal 30 included.

After that, when the preset time is exceeded (S28), the call availability status notification server 70 notifies the call that the call is possible with the calling terminal 10 that attempts to connect the call to the called terminal 30 even with the called terminal 30. The possible status notification message is transmitted (S30).

In the process S30, the call availability status notification message transmitted to the called terminal 30 includes identification information (MIN) of the calling terminal 10, and the called subscriber who confirms the call availability status notification message is included in the call availability status notification message. It is preferable to be able to immediately perform a call connection by using the identification information MIN of the calling terminal 10 included.

3 is a flowchart illustrating a call availability status notification method in a mobile communication network according to another embodiment of the present invention.

First, when the calling terminal 10 attempts to make a call connection with the called terminal 30 (S40), the calling MSC 25 sends an HLR 50 to which the called terminal 30 is registered. The location information request message for requesting location information is transmitted (S42).

The HLR 50, which has received the location information request message from the calling MSC 25 through the process S42, establishes a call connection between the calling terminal 10 and the called terminal 30. Determine the state (S44).

As a result of the determination in step S44, when the power of the called terminal 30 is turned off or the call connection with the called terminal 30 is not possible because the called terminal 30 is busy, it is received from the calling MSC 25. On the basis of the additional service information of the calling terminal 10 included in the location information request message, the HLR 50, which recognizes that the calling terminal 10 is a subscriber of a call availability status notification service, calls the call availability status notification server 70. The terminal 30 transmits a call availability status notification request message including information indicating that the terminal 30 is in a power off state or a busy state (S46 and S48).

On the other hand, the HLR 50 confirms that the call connection with the called terminal 30 is impossible in step S48 described above, in response to the location information request message, the HLR 50 sends a response message including the announcement code information according to the state of the called terminal. The MSC 25 transmits the announcement message corresponding to the announcement message code information included in the response message received from the HLR 50 to the calling terminal 10.

As described above, after transmitting the announcement according to the state of the called terminal 30, the call is terminated according to the call termination request received from the calling terminal 10.

Thereafter, the HLR 50 monitors whether the called terminal 30 is restored to a callable state (S50), and when the called terminal 30 is restored to a callable state (S52), the call available state notification server 70 The terminating terminal 30 reports that the call has been restored to the available state (S54).

The call availability status notification server 70 that has been reported from the HLR 50 that the called terminal 30 has been restored to the available call state through the process S54 may call the calling terminal 10 retrieved from the database as identification information of the called terminal 30. On the basis of the identification information (MIN) of the call through the SMSC 60 to the calling terminal 10 transmits a call availability status notification message indicating that the called terminal 30 has been restored to the available state (S56).

The calling terminal 10 receiving the call availability status notification message through the process S56 may notify the subscriber that the call availability status notification message has been received through an alarm or vibration, and the subscriber who has confirmed the call availability status notification message may call. The call connection is immediately performed by using the identification information MIN of the called terminal 30 included in the status notification message.

As described above, when the calling terminal 10 requests a call connection with the called terminal 30 according to the key operation of the calling subscriber, the calling MSC 25 sends the HLR 50 to which the called terminal 30 is registered. The location information request message for the destination terminal 30 is transmitted to the destination terminal 30, and the HLR 50 that receives the location information request message for the destination terminal 30 from the originating MSC 25 receives a call availability status notification server ( 70) reports that the calling terminal 10 has requested a call connection to the called terminal 30.

On the other hand, the call availability status notification server 70 that transmits the call availability status notification message to the calling terminal 10 through the above-described process S56, the calling terminal 10 from the HLR 50 within the preset time, the called terminal 30 In step S58, it is determined whether a report for requesting a call connection is received.

As a result of the determination in step S58, when a report is received from the HLR 50 that the calling terminal 10 requests the call connection to the called terminal 30 within a predetermined time, a call possibility status notification message is sent to the called terminal 30. Since there is no need to transfer, the call availability status notification service ends.

On the other hand, when the determination result of the above-described process S58 does not receive a report that the calling terminal 10 has requested a call connection from the HLR 50 to the called terminal 30 within a predetermined time, the called terminal 30 is also received. The terminal 30 transmits a call possibility status notification message indicating that the call is available with the calling terminal 10 which has attempted to connect the call (S60).

The call availability status notification system and method in the mobile communication network of the present invention are not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

According to the system and method for notifying of a call availability state in a mobile communication network of the present invention as described above, when the called terminal recovers to a call state, when a call possibility status notification message is transmitted to the calling terminal and the called terminal, the calling terminal is called. By transmitting a call availability status notification message to the called terminal with a time difference, the calling terminal and the called terminal do not simultaneously perform a call connection request, thereby preventing the collision of the call with each other.

Accordingly, it is possible to provide a better mobile communication service to a mobile communication subscriber.

Claims (8)

When one calling terminal attempts to connect a call to one called terminal, when the called terminal is identified as one of a power off state and a busy state, and a call connection is impossible, the calling state notification server is sent. Requesting a call availability report service, monitoring the state of the called terminal through the called MSC, and when the called terminal recovers to a callable state, the called terminal returns to a callable state notification server. A home location register for reporting that a license has been reported; If the called terminal receives a report from the home location register that the called terminal has been restored to a callable state, it is determined whether the calling terminal has requested a call connection to the called terminal within a preset time after transmitting a call possibility status notification message to the calling terminal. A call availability status notification server that determines, and if not, transmits a call availability status notification message to the called terminal; And a short message center for converting a call availability status notification message received from the call availability status notification server into a short message and transmitting the message to the calling terminal and the called terminal. delete According to claim 1, The call availability status notification server, When the called terminal receives a report from the home location register that the called terminal has been restored to a callable state, a call possibility status notification message is transmitted to the calling terminal, and the calling terminal is connected to the called terminal from the home location register within a preset time. If it is not received a report that the request, the call availability status notification system in the mobile communication network, characterized in that for transmitting the call availability status notification message to the called terminal. The method of claim 3, wherein the home location register, After reporting that the called terminal has been restored to the available call state to the call availability status notification server, if the calling terminal requests a call connection to the called terminal and requests a location information for the called terminal from the calling exchange, The call availability status notification system of the mobile communication network, characterized in that the calling terminal notification that the calling terminal has requested the call connection to the called terminal. Requesting location information of the called terminal from a calling terminal to a home location register in which the called terminal is registered; As a result of determining the current state of the called terminal by the home location register, if the called terminal is unable to connect to either of the power off state and the busy state, the call availability state notification service is provided to the call availability state notification server. Requesting process; Monitoring, by the home location register, whether the called terminal is restored to a callable state and reporting that the called terminal is restored to a callable state when the called terminal is restored to a callable state; and; Transmitting, from the home location register, a call availability status notification message to the calling terminal by the call availability status notification server that has been reported that the called terminal has been restored to a call availability state; After sending the call availability status notification message to the calling terminal, it is determined whether the calling terminal has requested a call connection to the called terminal within a preset time, and if not, the call possibility status notification message is sent to the called terminal. A method of notifying of a call availability in a mobile communication network, comprising the step of transmitting. delete The method of claim 5, wherein the transmitting of the call availability status notification message to the calling terminal and the called terminal is performed. Transmitting, from the home location register, a call availability status notification message to the calling terminal by the call availability status notification server that has been reported that the called terminal has been restored to a call availability state; Determining whether the calling terminal requests a call connection to the called terminal within a preset time; And when the calling terminal does not request a call connection to the called terminal within a preset time, the method comprising the step of transmitting a call possibility status notification message to the called terminal. Possible status notification method. The method of claim 7, wherein the transmitting of the call availability status notification message to the calling terminal and the called terminal comprises: When the calling terminal requests a call connection with the called terminal according to a key operation of the calling subscriber confirming the call availability status notification message, requesting location information of the called terminal from the calling exchange to the home location register; ; And reporting from the home location register to the call availability state notification server that the calling terminal has requested a call connection to the called terminal.
KR1020060074570A 2006-08-08 2006-08-08 System and method for notifying possibility of call in mobile communication network KR101288344B1 (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
KR20020089628A (en) * 2001-05-23 2002-11-30 주식회사 케이티프리텔 Improved short message broadcasting service system and method thereof
KR20040009734A (en) * 2002-07-25 2004-01-31 (주) 엘지텔레콤 Method of informing a sender the end of a call in a mobile communicator system
KR20040102954A (en) * 2003-05-30 2004-12-08 유티스타콤코리아 유한회사 Method for call completion service

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020089628A (en) * 2001-05-23 2002-11-30 주식회사 케이티프리텔 Improved short message broadcasting service system and method thereof
KR20040009734A (en) * 2002-07-25 2004-01-31 (주) 엘지텔레콤 Method of informing a sender the end of a call in a mobile communicator system
KR20040102954A (en) * 2003-05-30 2004-12-08 유티스타콤코리아 유한회사 Method for call completion service

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