KR20180132304A - Method and system for converting call in multi device environment - Google Patents

Abstract

The present invention relates to a call transfer method and system for performing call transfer between devices in a call multi-device environment. According to an embodiment of the present invention, the call transfer system comprises: a call control module for performing a call connection between an external terminal and a device in the group; and a conference room management module for allowing the external terminal connected with a call and the device through call conversion to join the conference room and other devices in the group to join the conference room, and granting a floor to one device of the devices based on media intensity received from each device and performing communication between the device to which the floor is granted and the external terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-

The present invention relates to a call transfer technique, and more particularly, to a call transfer method and system for performing call transfer between devices in a multi-device environment.

As diverse and specialized devices are developed and released, users often own multiple devices. For example, a user may use a smart phone, a tablet PC, an IPTV, a wall pad, or an Internet telephone. In such a multi-device environment, users can perform a video call or a voice call of another user using a specific device.

Also, in a multi-device environment, when a call is connected from another terminal, the user can perform call transfer to a specific device. The following patent document relates to a call button call forwarding method, and it is disclosed that a call is transferred to another terminal through a button operation of a user.

However, requesting the user for a specific operation to switch a call between a plurality of devices has a problem of not only deteriorating the call convergence power but also causing inconvenience to the user.

Korean Patent Publication No. 10-2012-0048933

SUMMARY OF THE INVENTION It is an object of the present invention to provide a call switching method and system for switching a call to another device in a multi-device environment without any manual operation.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a call transfer system including: a call control module for performing call connection between an external terminal and a device in a group; And joining the external terminal connected to the call with the device and joining the device to the conference room and joining the other devices in the group to the conference room and granting a voice to any one of the devices based on the media strength received from each device And a conference room management module for performing a communication between the device to which the floor is granted and the external terminal.

The conference room management module transmits the media received from the device to which the voice is given to the external terminal and blocks the transmission of the media received from the device to which the voice is not given.

In addition, the conference room management module analyzes the media received from the device to which the voice is not granted, and when the intensity of the voice signal collected from the device to which the voice is not granted remains below a predetermined value for a predetermined time, Can be closed. In this case, the call control module switches the call between the talked party device and the external terminal from the conference room-based call to the general call.

According to another aspect of the present invention, there is provided a method for performing call transfer in a multi-device environment, the method comprising: joining a plurality of devices belonging to a group and an external terminal into a conference room; Providing a talk right to a first device among a plurality of devices to advance a call between an external terminal and a first device to which voice is given; Monitoring voice signal strength based on media received from each device; And if the second device has a voice signal strength higher than a threshold value of the voice signal strength of the first device to which the voice is given as a result of the monitoring, And advancing a call between the external terminal and the second device.

The present invention has an advantage of performing call transfer between devices by performing a call transfer to a device located near the user by analyzing the strength of a voice signal obtained from the device in the group to estimate the position of the user .

In addition, the present invention provides only a specific device to a specific device among the devices participating in a conference room, and transmits the media received from the specific device to the counterpart terminal, whereby media of a plurality of devices participating in the conference are all transmitted to the counterpart terminal Noise, and echo.

In addition, when the voice signal is not received within a predetermined time from the devices having no voice, the present invention closes the conference room and switches the other party's terminal and device in the call to a general call, thereby saving resources have.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and form a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention. And shall not be construed as limited to such matters.
1 is a diagram illustrating a call transfer system applied to a multi-device environment according to an embodiment of the present invention.
2 is a flowchart illustrating a method for performing an external call transfer based on keyword recognition in a call transfer system according to an embodiment of the present invention.
3 is a flowchart illustrating a method for performing an external call transfer according to call connection in a call transfer system, according to another embodiment of the present invention.
4 is a flowchart illustrating a method for performing call transfer according to a user's voice signal in a call transfer system according to an embodiment of the present invention.
5 is an exemplary diagram for illustrating an internal call transfer between devices.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a call transfer system applied to a multi-device environment according to an embodiment of the present invention.

As shown in FIG. 1, the call transfer system 300 is connected to an IMS (IP Multimedia Subsystem) network 200 to perform call transfer between the devices 110, 120, and 130 belonging to the same group.

The IMS network 200 includes a CSCF 210 as a network for performing IP-based communication.

A CSCF (Call Session Control Function) 210 is a node that performs service processing in the IMS network 200 and is a basic infrastructure node for SIP (Session Initiation Protocol) based message processing and media processing. CSCF 210 performs subscriber registration, authentication, billing, service triggering, message routing, recipient location lookup, compression and decompression of SIP messages, and connection to other networks. The CSCF 210 may be classified into an S-CSCF (Serving-CSCF), a P-CSCF (Proxy-CSCF), and an I-CSCF (Interogating-CSCF) according to its functions.

The IMS network 200 may interwork with a Terrestrial Radio Access Network (UTRAN) or an Evolved Terrestrial Radio Access Network (EUTRAN) to communicate with a communication device. The IMS network 200 includes a home subscriber server (HSS) in which subscriber profile information is recorded.

The counterpart terminal 400 can communicate with any one of the devices 110, 120, and 130 in the group as a communicable external terminal not included in the group. Also, the counter party terminal 400 can be transferred and participated in the conference room under the control of the call transfer system 300. [

Each of the devices 110, 120, and 130 is a communicable and talkable communication device. The devices 110, 120, and 130 are IPTV, a wall pad, an Internet phone, a tablet PC, a smart watch, , An Internet of Things (IoT) device, and the like. The one or more devices 110, 120, 130 may be grouped. For example, a plurality of devices 110, 120, and 130 installed in a user's home network may be set as a group. Identification information of each device 110, 120, 130 set as a group is registered in the call transfer system 300.

Each of the devices 110, 120, and 130 may participate in a conference room to perform a group call. In this case, each of the devices 110, 120, and 130 transmits the peripheral audio obtained through the microphone to the call transfer system 300 send. Each device 110, 120, and 130 is controlled by the call control system 300 to control the call. In addition, any one of the devices 110, 120, and 130 participating in the conference room can receive a voice and perform a call with the other party's terminal 400. [

The devices 110, 120 and 130 in the group are loaded with an application for call transfer, and can report to the call transfer system 300 when the keyword is voice recognized. In addition, each of the devices 110, 120, and 130 participates in a conference room under the control of the call transfer system 300, collects peripheral audio, and reports it to the call transfer system 300.

The call transfer system 300 is a system for performing internal call transfer or external call transfer, and is connected to the IMS network 200 to perform IP-based media processing, and controls calls such as call termination, call transfer, and the like . Although the call transfer system 300 is shown as being external to the IMS network 200 in FIG. 1, the call transfer system 300 may be installed in the IMS network 200.

The call transfer system 300 includes a call control module 310 and a conference room management module 320. Each of the modules 310 and 320 may be implemented as an independent server and includes a call control module 310, The conference room management module 320 may be implemented in a logical form within a server. In addition, the call control module 310 and the conference room management module 320 may be implemented in software or hardware, or may be implemented in a system through a combination of software and hardware. The call transfer system 300 may include one or more processors and memory and the call control module 310 and the conference room management module 320 may be implemented by a processor May be stored in the memory.

The call control module 310 controls general calls between communication devices. That is, call control module 310 controls one-to-one communication between communication devices. The call control module 310 may form a call session between both terminals to perform a call based on a telephone number, and may form a call session between both terminals so that a non-telephone number based call is performed. The call control module 310 controls the call to be connected to the other party's terminal 400 in a call with a specific device in the group under the control of the conference room management module 320, (400) is set as a normal call session.

The conference room management module 320 stores and manages the identification information of the devices belonging to the group, opens and manages conference rooms, and controls media such as audio, moving pictures and the like generated in the conference room. In particular, when a call switching event occurs, the conference room management module 320 controls all the devices 110, 120, and 130 in the group and the communication counterpart terminal 400 to participate in the conference room. At this time, the conference room management module 320 controls the media of the device having the voice right among the devices in the group participating in the conference room to be transmitted to the counterpart terminal 400, and blocks the media delivery received from the remaining devices, The call is allowed to proceed only between the granted device and the other party's terminal. The media of the device to which the voice is given is transmitted to the counterpart terminal 400 and the media of the device to which the voice is not given is transmitted to the conference room management module 320 The transmission to the counterpart terminal 400 is canceled. Here, the media includes multimedia data such as audio, dext, video, and the like.

Also, the conference room management module 320 monitors the voice signal strength of each of the participating devices 110, 120, and 130 participating in the conference room, and determines that another device that has collected the voice signal strength higher than the threshold value If so, proceed with the internal transfer. That is, the conference room management module 320 grants the voice of the device that collected the greater voice strength, permits the media transmission, withdraws the voice of the existing device on the call, and cancels the media transmission. Accordingly, the counterpart terminal 400 receives the media from the new devices 110, 120, and 130.

In the state where the call transfer is completed, if the voice signals of a predetermined intensity or more are not collected from the devices 110, 120, and 130 that have no voice for a preset time, the conference room management module 320 proceeds to call external change And closes the conference room and controls the devices 110, 120, 130 and the counterpart terminal 400 to have a general call connection (that is, a call connection through the call control module).

2 to 5, it is assumed that a corresponding communication device 400 is a terminal performing a communication with a device in a group, and the first device 110 is referred to as 110, the second device 110 is referred to as a second The device 120 is denoted by reference numeral 120, and the third device 130 is denoted by reference numeral 130. FIG.

2 is a flowchart illustrating a method for performing an external call transfer based on keyword recognition in a call transfer system according to an embodiment of the present invention.

Here, the external call transfer means a change from a conference call to a general call or a general call to a conference call, and an internal call transfer means that a call device is changed according to a change in talk do.

2, the call control module 310 of the call transfer system 300 connects a call between the counterpart terminal 400 and the first device 110 in the group, and performs a video call or a voice call between the two devices (S201).

The third device 130 belonging to the same group as the first device 110 performs a call transfer event through voice keyword recognition in the middle of the communication between the other party's terminal 400 and the first device 110 (S203). That is, the third device 130 can recognize a voice corresponding to a call transfer event (for example, "Hello" Then, the third device 130 transmits a notification message to the conference room management module 320 to notify the call transfer event according to the keyword recognition (S205).

The conference room management module 320 then initiates an out-of-call conversion (i. E., Converting a general call made in the call control module 310 into a conference room-based call). That is, the conference room management module 320 identifies the group mapped with the identification information of the third device 130 (S207), checks all the devices 110, 120, and 130 belonging to the group, (S209). ≪ / RTI >

Then, the conference room management module 320 transmits a call reset request message including the device list belonging to the group and the established conference room identification information to the call control module 310 (S211).

Then, the call control module 310 confirms the device list included in the call reset request message, identifies the device (i.e., the first device) in which the current call is performed from the device list, (I.e., the other party's terminal) that is in communication with the communication terminal 110. Then, the call control module 310 transmits the identification information of the first device 110 in communication with the counter party terminal 400 to the conference room management module 320 (S213). Then, the call control module 310 transmits a Reinvite message requesting call reconnection to the identified counterpart terminal 400 (S215). At this time, the call control module 310 records the conference room identification information in the Reinvite message.

Next, the conference room management module 320 determines whether the device in communication with the counterpart terminal 400 among the devices in the group is the first device 110 based on the communication device identification information received from the call control module 310 And gives a voice to the first device 110 (S217). The media generated in the device in which the voice is set is transmitted to the counterpart terminal 400 and the media generated in the device to which the voice is not assigned is transmitted to the counterpart terminal 400 And is not forwarded and is blocked by the conference room management module 320.

Next, the call control module 310 transmits conference room identification information to each of the devices 110, 120, and 130 belonging to the group, and guides each of the devices 110, 120, and 130 to access the conference room (S219 , S221, and S223).

Next, the counterpart terminal 400 accesses the conference room established in the conference room management module 320 based on the conference room identification information included in the Reinvite message, and participates in the conference room, Or a voice call is performed (S225). In other words, the counterpart terminal 400 transfers the call from the general call (that is, call through the call control module) to the call through the conference room.

Each of the first device 110, the second device 120 and the third device 130 is connected to the conference room established in the conference room management module 320 based on the received conference room identification information And participate in the conference room (S227, S229, S231). At this time, the first device 110 in communication with the counterpart terminal 400 transfers the call to the call through the conference room in a normal call (i.e., call through the call control module).

Next, the conference room management module 320 controls the media of the first device 110 to which the floor is set to be transmitted to the counterpart terminal 400, and controls the second device 120 and the third device 130, To prevent the media acquired by the devices 110, 120, and 130 other than the first device 110 from being transmitted to the counterpart terminal 400, And controls the media (S233). In addition, the conference room management module 320 transmits the media received from the counterpart terminal 400 to only the first device 110 to which the voice is set, and not to be transmitted to the second device 120 and the third device 130 Control.

According to the above-described procedure, when the call transfer event occurs, the counterpart terminal 400, the first device 110, the second device 120, and the third device 130 participate in the conference. The first device 110 in the first call has priority to speak and thus the media is transmitted and received between the first device 110 and the counterpart terminal 400 even if a plurality of devices participate in the conference, The media delivery of the mobile terminals 110, 120, and 130 is blocked. As a result, the outgoing call transfer proceeds without changing the originating device and the destination device. Each of the second device 120 and the third device 130, to which the voice is not given, transmits the peripheral audio obtained through the microphone to the call control module 310 and waits for the voice setting.

3 is a flowchart illustrating a method for performing an external call transfer according to call connection in a call transfer system, according to another embodiment of the present invention.

In the description with reference to FIG. 3, the parts overlapping with the description with reference to FIG. 2 will be described by compressing and summarizing the differences.

Referring to FIG. 3, the call control module 310 of the call transfer system 300 connects a call between the counterpart terminal 400 and the first device 110 in the group (S301). Then, the call control module 310 recognizes that a device in the group is in a call connection state and transmits a call transfer event including the identification information of the first device 110 to the conference room management module 320 (S303) . The call control module 310 stores a device list of each group, and can determine whether the first device 110 belongs to a group based on the device list.

The conference room management module 320 identifies the identification information of the first device 110 included in the call transfer event, and identifies the group mapped with the identification information (S305). Then, the conference room management module 320 identifies all the devices belonging to the identified group, and opens a conference room in which the devices in the group can participate (S307). Next, the conference room management module 320 gives a voice to the first device 110 (S309).

Then, the conference room management module 320 transmits a call reestablishment request message including the established conference room identification information to the call control module 310 in order to join the counterpart terminal 400 to the conference room (S311) .

Then, the call control module 310 transmits a Reinvite message requesting a call connection to the counterpart terminal 400 (S313). At this time, the call control module 310 records the established conference room identification information in the Reinvite message. In addition, the conference room management module 320 transmits the conference room identification information to each of the devices 110, 120, and 130 belonging to the group to guide each of the devices 110, 120, and 130 to access the conference room S315, S317, S319).

Next, the counterpart terminal 400 accesses the conference room based on the conference room identification information included in the Reinvite message (S321). Each of the first device 110, the second device 120 and the third device 130 accesses the conference room established in the conference room management module 320 based on the received conference room identification information (S323, S325, S327).

Next, the conference room management module 320 allows the media of the first device 110 to which the floor is granted to be transmitted to the counterpart terminal 400, and allows the second device 120 and the third device 130, To prevent the media acquired by the devices 110, 120, and 130 other than the first device 110 from being transmitted to the counterpart terminal 400, And controls the media (S329). In addition, the conference room management module 320 transmits the media received from the counterpart terminal 400 to only the first device 110 to which the voice is set, and not to be transmitted to the second device 120 and the third device 130 Control.

4 is a flowchart illustrating a method for performing call transfer according to a user's voice signal in a call transfer system according to an embodiment of the present invention.

5 is an exemplary diagram for illustrating an internal call transfer between devices.

Fig. 4 is a subsequent method of Fig. 2 or Fig.

4 and 5, the first device 110, the second device 120, the third device 120, and the third device 110 are connected to each other in a state in which communication is performed between the first device 110 and the counterpart terminal 400, Each of the devices 130 transmits the media obtained through the input means such as a microphone, a camera, etc. to the conference room management module 320 in real time.

Then, the conference room management module 320 transmits the media received from the first device 110 to which the voice is given to the counterpart terminal 400, and the second device 120 and the third device 130 and the third device 130 to prevent the media received from the first device 110, the second device 120 and the third device 130 from being transmitted to the counterpart terminal 400, And monitors the signal (S401).

The conference room management module 320 extracts the user's voice signal from the media received from the first device 110 to which the current voice is given and transmits the voice signal received from the second device 120 and the third device 130 The user's voice signal strength of the first device 110 is compared with the user voice signal strength of the second device 120 and the user voice signal strength of the third device 130 after extracting the voice signal of the user from the media do. At this time, the conference room management module 320 filters the frequency band corresponding to the voice signal from the media received from the first device 110 to which the voice is granted (i.e., in the call) to obtain the frequency pattern of the voice signal of the user Extract the user voice signal from the media of the second device 120 based on the frequency pattern, and extract the user voice signal from the media of the third device 130. [

Next, the conference room management module 320 determines whether or not a user voice signal having a strength higher than a threshold value than the user voice signal of the first device 110 is received from the other devices 110, 120, and 130. If it is determined that the user's voice signal having a strength higher than the threshold value is received through the other devices 110, 120, and 130 than the user voice signal of the first device 110 as a result of the determination, It is determined that the user has moved from the location of the first device 110 to the location of the other device 130 and the internal call transfer to the other device 130 is determined (S403). 4, it is explained that the conference room management module 320 has decided to transfer the call from the first device 110 to the third device 130. [

Next, the conference room management module 320 gives a voice to the third device 130 to which the call is determined, and changes the voice by releasing the voice of the first device 110 (S405). Subsequently, the conference room management module 320 controls the media of the third device 130 to which the voice is given to be transmitted to the counterpart terminal 400, and controls the first device 110 and the second device 120, The communication from the first device 110 to the third device 130 is internally switched (S407).

5, when the user is performing a call around the first device 110 while the first device 110 is fixed at a specific position, the user moves to the periphery of the third device 130 The strength of the user's voice signal of the first device 110 is gradually weakened and the strength of the user's voice signal of the third device 130 becomes stronger so that the user's voice of the third device 130 The signal strength becomes larger than a threshold value of the user's voice signal strength of the first device 110. In this case, the conference room management module 320 determines an internal call transfer from the first device 110 to the third device 130, gives a voice to the determined third device 130, 1 device 110 and controls the user to make a call with the counter party terminal 400 through the third device 130. [

Upon completion of call internal switching, the conference room management module 320 receives the voice included in the media signal received from each of the first device 110, the second device 120, and the third device 130 as in step S401 And analyzes the strength of the user's voice signal obtained at each of the devices 110, 120, and 130 by analyzing the signal strength. The conference room management module 320 may receive the user voice signal having the strength higher than the threshold value than the user voice signal strength of the third device 130 having the current voice through the other devices 110 and 120, 110, and 120, resumes the voice of the third device 130, and gives the voice to the other devices 110 and 120 that have decided to transfer the call.

On the other hand, the conference room management module 320 may detect that all of the user's voice is not detected for a predetermined time (for example, two minutes) on the media received from the first device 110 and the second device 120 that do not have a voice, When the strength of the user's voice signal of the first device 110 and the strength of the user's voice signal of the second device 120 are maintained to be equal to or less than a predetermined value during the period of time (S409, S411)

The conference room management module 320 causes the call between the third device 130 and the counterpart terminal 400 of the current voice to be switched from the conference call to the general call when the external call is determined to be switched. In detail, the conference room management module 320 transmits a call merge requesting call transfer to the general call to the call control module 310 (S413). At this time, the conference room management module 320 records the identification information of the counterpart terminal 400 and the identification information of the third device 130 to which the voice is given in the call merging message.

Then, the call control module 310 checks the identification information of the counterpart terminal 400 and the third device 130 in the call merging message, and then transmits a Reinvite message requesting reconnection to the general call to the counterpart terminal 400 To the third device 130 (S415, S417).

Then, the counterpart terminal 400 forms a call path with the third device 130 through the call control module 310 to perform a general 1: 1 call (S419).

When the normal call transfer between the counterpart terminal 400 and the third device is completed, the call control module 310 informs the conference call management module 320 that the call has been normally performed, And closes the opened conference room (S421).

As described above, the call transfer system 300 according to the present invention analyzes a user's voice signal strength obtained from the devices 110, 120, and 130 in the group to estimate the location of the user, So that the call can be performed between the devices without any special operation. In addition, the call transfer system 300 may grant a voice only to a specific device among the devices 110, 120, and 130 participating in the conference room, and transmit the media received from the specific device to the opposite terminal, Echo, etc., which are generated when the media of the media is transmitted to the counterpart terminal.

While the specification contains many features, such features should not be construed as limiting the scope of the invention or the scope of the claims. In addition, the features described in the individual embodiments herein may be combined and implemented in a single embodiment. Conversely, various features described in the singular < Desc / Clms Page number 5 > embodiments herein may be implemented in various embodiments individually or in combination as appropriate.

Although the operations have been described in a particular order in the figures, it should be understood that such operations are performed in a particular order as shown, or that all described operations are performed to obtain a sequence of sequential orders, or a desired result . In certain circumstances, multitasking and parallel processing may be advantageous. It should also be understood that the division of various system components in the above embodiments does not require such distinction in all embodiments. The above-described program components and systems can generally be implemented as a single software product or as a package in multiple software products.

The method of the present invention as described above can be implemented by a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto optical disk, etc.). Such a process can be easily carried out by those skilled in the art and will not be described in detail.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

110, 120, 130: Device 200: IMS network
300: Call transfer system 310: Call control module
320: conference room management module 400:

Claims (11)

A call control module for performing a call connection between an external terminal and a device in a group; And
A call is made to one of the devices on the basis of the media intensity received from each of the devices, and the other device in the group is allowed to participate in the conference, And a conference room management module for making a communication between the device to which the voice is given and the external terminal. The method according to claim 1,
Wherein the conference room management module comprises:
And when the call transfer event occurs, establishing the conference room to join the external terminal and the devices in the group to the conference room. 3. The method of claim 2,
Wherein the call transfer event is generated when any one of the plurality of devices voice-recognizes an event keyword. 3. The method of claim 2,
And the call transfer event is generated when a call is connected between the external terminal and a device in the group by the call control module. 5. The method according to any one of claims 1 to 4,
Wherein the conference room management module comprises:
And transfers the media received from the device to which the voice is given to the external terminal, and blocks the transmission of the media received from the device to which the voice is not granted. 5. The method according to any one of claims 1 to 4,
The conference room management module analyzes the media received from the device to which the voice is not granted and closes the conference room if the strength of the voice signal collected by the device to which the voice is not granted remains below a predetermined value for a predetermined time ,
Wherein the call control module switches the call between the talked party device and the external terminal from the conference room-based call to the general call. 5. The method according to any one of claims 1 to 4,
Wherein the conference room management module comprises:
Analyzes the media received from each device to check the strength of the user voice signal collected by each device, and gives a voice to the device whose user voice signal strength is equal to or higher than the threshold value. A method for a call transfer system to perform a call transfer in a multi-device environment,
Joining a plurality of devices belonging to a group and an external terminal into a conference room;
Providing a talk right to a first device among a plurality of devices to advance a call between an external terminal and a first device to which voice is given;
Monitoring voice signal strength based on media received from each device; And
And if the second device has a voice signal strength higher than a threshold value of the voice signal strength of the first device to which the voice is given as a result of the monitoring, the voice of the first device is recovered and the voice is given to the second device, And advancing a call between the external terminal and the second device. 9. The method of claim 8,
Further comprising connecting a general call between the external terminal and the first device prior to joining the conference room,
Wherein engaging in the conference room comprises:
Establishing the conference room and participating in the conference room with a plurality of devices belonging to the group; And
And switching the call of the external terminal to join the external terminal to the conference room. 10. The method according to claim 8 or 9,
Analyzing the media received from the device to which the voice is not granted, and closing the conference room if the strength of the user voice signal acquired from the device to which the voice is not granted is maintained below a predetermined value for a predetermined time; And
And converting the call formed between the voice-granted device and the external terminal into the common call from the conference room-based call. 10. The method according to claim 8 or 9,
Advancing the call comprises:
To the external terminal, the media received from the device to which the voice is given, and interrupts the transmission of the media received from the device to which the voice is not granted.

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