KR100527200B1 - method and apparatus for offer conference service in exchange switch - Google Patents

Abstract

The present invention relates to a multi-party call service providing apparatus and a method of providing the same in an exchange system, which is connected to a plurality of IP terminals and a LAN, and also connected to a plurality of general terminals and other communication networks. When providing a multi-party call service according to a user's request of a terminal, without a separate equipment, the multi-party call using the channel information set between the gateway of the switching system and each IP terminal, and the port information connected to each general terminal To provide services.

Description

Apparatus and method for providing a multi-party call service in an exchange system {method and apparatus for offer conference service in exchange switch}

The present invention relates to a multi-party call service providing apparatus and a method of providing the same in a switching system, and more specifically, the switching system is multi-party to the IP terminal connected through the IP network and the general terminal connected through the other communication network without additional equipment The present invention relates to a multi-party call service providing apparatus of a switching system for providing a call service and a method of providing the same.

FIG. 1 is a block diagram illustrating a configuration of an exchange system that provides a conference call service over a general IP network.

Referring to FIG. 1, a switching system 10, a plurality of IP terminals 20, a gate keeper 21 and a MCU 22 may be included.

And, the exchange system 10 includes a gate way 11.

In this case, the plurality of IP terminals 20, the gatekeeper 21, the MCU 22, and the switching system 10 are connected to a local area network (LAN).

The IP terminal 20 allows a user to receive a voice call service through the IP network.

The IP terminal 20 is to provide a function similar to that of a conventional digital phone through an IP network, by setting up a call with another IP terminal 20 through a LAN and exchanging voice information. Provide voice call service.

In addition, the gatekeeper 21 provides a pre-call and a call control service to the IP terminal 20 so that each IP terminal 20 can receive a voice call service.

That is, the gatekeeper 21 provides an address translation function, an admission control function, a bandwidth control function, and a zone management function.

At this time, the address switching function is to switch an alias address or other address of each IP terminal 20 to an IP address, and the admission control function is an ARQ (Admission ReQuest) message, an ACF (admission ComFirm) message, or an ARJ. (Admission ReJect) message to accept the voice call service for each IP terminal 20.

The bandwidth management function is to manage bandwidth of each IP terminal 20 by using a bandwidth request (BQ) message, a bandwidth confirm (BCF) message, a bandwidth width (BRJ) message, and the like. It manages each IP terminal 20, the gateway 11, the MCU 22, etc. in its own area.

When the call request signal is received from the IP terminal 20 with the terminal of another communication network, the switching system 10 sets up a call between the terminal and the IP terminal 20, or connects the IP terminal 20 with the terminal of the other communication network. When a call request signal is received, a call is established between the corresponding terminal and the IP terminal 20 to provide a voice call service.

In addition, the gateway 11 allows the IP terminal 20 to perform a voice call with a terminal of another communication network. That is, the gateway 11 converts the format of audio, video, and data received from an IP network or another communication network to suit other communication networks or IP networks.

The MCU 22 provides a conference call service between three or more IP terminals 20. The MCU 22 receives audio, video, and data from three or more IP terminals 20, and transmits the multi-point processor (MP) to each IP terminal 20 participating in the conference, and participates in the conference. It is provided with a multi-point controller (MC) for adjusting the configuration and capacity of each IP terminal 20.

A method of providing a conference call service to each IP terminal 20 in the general switching system 10 will be described.

A case where the first IP terminal 20 and the second IP terminal 20 make a conference call with the third IP terminal 20 while the voice call is being performed through the LAN will be described.

First, the gatekeeper 21 registers the IP address of each IP terminal 20, and the first IP terminal 20 sets up a call with the second IP terminal 20 through the gatekeeper 21, Make a call.

The first IP terminal 20, which is the subject of the conference call, transmits a conference call request signal for joining the third IP terminal 20 to the MCU 22, and the MC of the MCU 22 transmits the first IP terminal. When the conference call request signal is received from the terminal 20, it is determined whether there is a channel resource for establishing a conference call between the first IP terminal 20, the second IP terminal 20, and the third IP terminal 20. , If there is a channel resource, establishes a conference call between each IP terminal 20.

When the MC establishes a conference call between each IP terminal 20, the MP of the MCU 22 transmits audio, video, and data received from each IP terminal 20 to each terminal participating in the conference.

However, the method of providing a conference call service may provide conference call service only when a separate device for providing conference call service between each IP terminal 20, that is, MCU 22, is provided.

In addition, when providing a conference call service between each IP terminal 20 connected to the switching system 10 and an IP network and a general terminal to another communication network, the MCU providing conference call service to each IP terminal 20. In addition to (22), there is a problem that a separate equipment for providing a conference call service with a general terminal is required.

Accordingly, the present invention has been made to solve the above problems, and provides a call service between the switching system and at least one IP terminal connected to the IP network without any equipment, and further, the IP terminal connected to the IP network. It is an object of the present invention to provide a multi-party call service providing apparatus and a method of providing the same, which provides a conference call service between general terminals connected to other communication networks without any additional equipment.

The apparatus for providing a conference call service of the switching system according to an aspect of the present invention for achieving the above object is, when a channel setting request signal for a conference call is received from the terminal, a plurality of terminals and channels participating in the conference call. Each of the terminals is configured by connecting the ports corresponding to the channel set in each terminal by using a gateway that provides information on the set channel, and channel information of each terminal provided from the gateway. It includes a port management unit for setting up a conference call.

The port manager according to the present invention uses the channel information of each terminal provided from the gateway to identify a port to be connected to each terminal, and uses the identified port information to generate a port control signal. And a port processing unit for connecting ports connected to each terminal according to a port control signal generated from the call processing unit.

In addition, the port management unit according to the present invention, if the terminal participating in the multi-party call is an IP terminal, the port corresponding to the channel information connected to the IP terminal, if the wired terminal, the port is connected to the wired terminal and the wired network It characterized in that to connect.

On the other hand, the multi-party call service providing method of the switching system according to another aspect of the present invention, when receiving a channel setting request signal for setting up a multi-party call from at least one or more terminals, setting each channel with each terminal, and each terminal Providing the channel information set to, and identifying the port corresponding to each terminal and the set channel, and connecting each port corresponding to each terminal and the set channel, and setting up a multi-party call between each terminal.

And, the port connection according to another aspect of the present invention, if the terminal is a wired terminal, and further comprising the step of connecting with the port corresponding to the port and the channel, the call is established through the wired terminal and the wired network, the IP terminal and the established channel It is characterized by.

Hereinafter, a multi-party call service providing apparatus and a method of providing the same according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a configuration of an exchange system for providing a conference call service according to an exemplary embodiment of the present invention.

2, a plurality of single terminals 30, a switching system 10, a plurality of IP terminals 20, and a gate keeper 21 may be included.

The exchange system 10 includes a communication interface 13, a port manager 12, and a gate way 11, and the port manager 12 includes a conference call processor 12a.

In the following description of the present invention will be described a case where a multi-party call between the exchange system 10 and the IP terminal 20 connected by a LAN (Local Area Network) and the single terminal 30 connected by a single line, It can be seen that the same is true when a conference call is performed between the IP system 20 connected to the switching system 10 and the LAN and the terminal connected to the other communication network.

The single terminal 30 is connected to the switching system 10 and a single line in a company or office, and the voice call from the switching system 10 to another single terminal 30 or the IP terminal 20 and Receive conference call services.

The IP terminal 20 is connected to the switching system 10 in a LAN, and receives a voice call and conference call service from the switching system 10 with another IP terminal 20 or a single terminal 30.

The gatekeeper 21 is a pre-call and call control service for each IP terminal 20 connected by a LAN, that is, address translation, admission control, and bandwidth control. By providing a control function and a zone management function, a voice call service between each IP terminal 20 is provided.

The gatekeeper 21 analyzes the call request signal received from the IP terminal 20, grasps the address information of the destination IP terminal 20, and transmits the identified address information to the corresponding IP terminal 20.

Each IP terminal 20 establishes a voice call using the address information received from the gatekeeper 21.

The communication interface unit 13 interfaces so as to establish a voice call between the single terminal 30 and the switching system 10.

When the gateway 11 receives a virtual channel setting request signal from the IP terminal 20, the gateway 11 sets a virtual channel with the corresponding IP terminal 20 and corresponds to the set virtual channel with the corresponding IP terminal 20. Allocates a physical channel.

Then, the allocated physical channel information is transmitted to each IP terminal 20 in which the virtual channel is set.

In addition, the gateway 11 converts the format of audio, video, and data received from each IP terminal 20 to be transmitted in a single line, transmits the data to the single terminal 30, and receives the signal from the single terminal 30. The audio, video, and data formats are converted to be transmitted to the IP network and transmitted to each IP terminal 20.

Then, the conference call processing unit 12a selects the conference call button of the single terminal 30 or the IP terminal 20, and when the conference call request signal is received from the terminal, holds the call between the terminals currently in communication ( hole), and establishes a conference call involving the third terminal.

That is, when the conference call request signal is received, the conference call processing unit 12a grasps port information of each terminal participating in the conference, and generates a port control signal to connect the corresponding ports to provide conference call service. To the port manager 12.

In this case, the user may select a conference call button set in the single terminal 30 or the IP terminal 20 to request a conference call. The conference call button may be the single terminal 30 or the IP terminal 20. When manufacturing or designing, a specific button may be set as a conference call button, or a conference call button may be set by a button combination of the terminal.

If the terminal participating in the conference call is the IP terminal 20, the conference call processing unit 12a generates a port control signal using the channel information set through the LAN 11 and the IP terminal 20 and the LAN. If the terminal participating in the conference call is a single terminal 30 connected by a single line or a trunk line terminal (not shown) connected by a trunk line, a port control signal is generated by using port information connected through the corresponding single line or trunk line. .

In addition, when the exchange system 10 provides an Infomobile service, the conference call processor 12a generates a port control signal by using port information set through a mobile station and an Infomobile server. .

Such an info mobile service is a next-generation wireless solution (Solution) incorporating CDMA-RF technology into the switching system 10, and provides SMS (voice communication and data short service) free of charge in an in-building office environment. It provides Short Message Service and supports hand-off with the public wireless network when it leaves the zone.

The port manager 12 connects the corresponding ports in accordance with the port control signal received from the conference call processor 12a to provide conference call service.

That is, the port manager 12 connects the ports corresponding to the channel set in the IP terminal 30 participating in the conference call according to the received port control signal, and the ports connected to the single terminal or the trunk line terminal to establish a multi-party conference. Set it.

3 is a flowchart illustrating a method of providing a conference call service between IP terminals by an exchange system according to an embodiment of the present invention.

Referring to FIG. 3, first, each IP terminal 20 registers its own IP address information with the gatekeeper 21, and the gatekeeper 21 manages address information, bandwidth, etc. of each IP terminal 20. .

In addition, the second IP terminal 20 establishes a voice call with the third IP terminal 20 through the gatekeeper 21 (S 1), and the user of the second IP terminal 20 receives the first IP terminal ( In order to make a conference call involving 20), the conference call button is selected (S 2).

When the user selects the conference call button, the second IP terminal 20 generates a conference call start signal, transmits the signal to the first IP terminal 20 (S 3), and further sends to the third IP terminal 20. Transmit (S 4).

At this time, the second IP terminal 20 queries the gatekeeper 21 for the address information of the first IP terminal 20 participating in the conference call, and receives the address information of the first IP terminal 20 received accordingly. Can be used to send a conference call start signal.

The second IP terminal 20 holds a voice call established with the third IP terminal 20 and requests the gateway 11 to establish a virtual channel (S5).

In addition, when the third IP terminal 20 receives a conference call start signal from the second IP terminal 20, the third IP terminal 20 holds a voice call established with the second IP terminal 20 and sets a virtual channel to the gateway 11. Request (S 6).

When the first IP terminal 20 participating in the conference call receives the conference call start signal from the second IP terminal 20, the first IP terminal 20 requests the gateway 11 to establish a virtual channel (S7).

When the virtual channel setting is requested from each IP terminal 20, the gateway 11 checks whether there is a margin of channel resource to be set in each IP terminal 20, and if there is a margin of channel resource, Set the virtual channel with the terminal 20.

In addition, the gateway 11 allocates a physical channel corresponding to each IP terminal 20 and a set virtual channel, and transmits information on the allocated physical channel to each IP terminal 20 (S 8 and S 9). , S 10).

When the first IP terminal 20 receives the information of the physical channel from the gateway 11, the first IP terminal 20 transmits the information of the corresponding physical channel to the second IP terminal 20, which is the subject of the conference call (S 11). When the third IP terminal 20 receives the information of the physical channel from the gateway 11, the third IP terminal 20 transmits the information of the corresponding physical channel to the second IP terminal 20 that is the subject of the conference call (S 12).

Then, the second IP terminal 20 receives information on the physical channel allocated from the gateway 11, information on the physical channel received from the first IP terminal 20, and the third IP terminal 20. The call is transferred to the conference call processing unit 12a (S 13).

The conference call processor 12a generates a port control signal using the physical channel information of each IP terminal 20 received from the second IP terminal 20.

In addition, the port manager 12 connects ports corresponding to the physical channels assigned to each IP terminal 20 from the gateway 11 in response to a port control signal received from the conference call processor 12a. 20, the conference call is set (S 14).

That is, when the port control signal is received from the conference call processor 12a, the port manager 12 connects the gateway 11 to a port corresponding to the physical channel assigned to each IP terminal 20, and each IP terminal. By tying up the ports connected to the (20) to one and establishes a voice call between each IP terminal (20).

4 is a flowchart illustrating a method of providing a conference call service between an IP terminal and a single terminal by a switching system according to another embodiment of the present invention.

Referring to FIG. 4, first, each IP terminal 20 registers its IP address information with the gatekeeper 21, and the gatekeeper 21 manages address information, bandwidth, and the like of each IP terminal 20. .

Then, the second IP terminal 20 establishes a call with the third IP terminal 20 through the gatekeeper 21 (S20), and the user of the second IP terminal 20 makes a single terminal 30. In order to make a conference call to join, a conference call button is selected (S 21).

When the user selects the conference call button, the second IP terminal 20 generates a conference call start signal and transmits the generated conference call signal to the third IP terminal 20 (S22).

Then, the second IP terminal 20 holds a voice call established with the third IP terminal 20 and requests the gateway 11 to establish a virtual channel (S 23).

In addition, when the third IP terminal 20 receives a conference call start signal from the second IP terminal 20, the third IP terminal 20 holds a voice call with the second IP terminal 20 and sets up a virtual channel with the gateway 11. Request (S 24).

When the virtual channel setting is requested from the second IP terminal 20 and the third IP terminal 20, the gateway 11 checks whether or not there is a margin of channel resources to be set in each IP terminal 20. If there is a margin of channel resources, each IP terminal 20 and a virtual channel are set.

In addition, the gateway 11 allocates a physical channel corresponding to each IP terminal 20 and a set virtual channel, and transmits information on the allocated physical channel to each IP terminal 20 (S 25 and S 26). ).

The third IP terminal 20 transmits the physical channel information received from the gateway 11 to the second IP terminal 20 that is the subject of the conference call (S 27).

The second IP terminal 20 transmits the physical channel information allocated by the second IP terminal 20 and the physical channel information received from the third IP terminal 20 to the conference call processing unit 12a of the switching system 10 ( S 28).

In addition, when the conference call processing unit 12a receives a conference call start signal in which the single terminal 30 participates from the second IP terminal 20, the conference call processing unit 12a receives a voice call through the corresponding single terminal 30 and the communication interface unit 13. Set, and grasp the port information used for the set voice call (S 29).

Then, the conference call processing unit 12a uses the information on the physical channel allocated to each IP terminal 20 received from the second IP terminal 20 and port information on which a voice call is established with the single terminal 30. A port control signal is generated, and the generated port control signal is provided to the port manager 12.

The port manager 12 includes a port corresponding to a physical channel assigned to each IP terminal 20 from the gateway 11 according to a port control signal received from the conference call processing unit 12a, and a voice of the single terminal 30. By connecting a port set up a call, a conference call is established between each IP terminal 20 and a single terminal 30 (S30).

That is, when the port control signal is received from the conference call processor 12a, the port manager 12 corresponds to a physical channel assigned to each IP terminal 20, and a port in which a voice call is established with the single terminal 30. Are interconnected to establish a voice call between each IP terminal 20 and a single terminal 30.

5 is a flowchart illustrating a method of providing a conference call service between an IP terminal and a single terminal by a switching system according to another embodiment of the present invention.

Referring to FIG. 5, first, each IP terminal 20 registers its IP address information with the gatekeeper 21, and the gatekeeper 21 manages address information, bandwidth, and the like of each IP terminal 20. .

The second IP terminal 20 establishes a voice call with the single terminal 30 through the switching system 10 (S40), and the user of the second IP terminal 20 joins the third IP terminal 20. Select the conference call button to make a conference call to (S 41).

At this time, the voice call setting of the second IP terminal 20 and the single terminal 30 is performed by the second IP terminal 20 as a control unit 14 of the switching system 10 with the single terminal 30. Send the request signal.

Then, the second IP terminal 20 requests the virtual channel setting to the gateway 11, and the gateway 11 sets up the virtual channel with the second IP terminal 20 and allocates a physical channel accordingly. . The gateway 11 transmits the information of the physical channel to the second IP terminal 20.

In addition, the controller 14 analyzes the call request signal received from the second IP terminal 20, grasps the called telephone number, and the single terminal 30 corresponding to the called telephone number 30 and the communication interface unit 13. Set up your voice call via.

The controller 14 generates a port control signal using the port information of the voice call set up with the single terminal 30 and the information of the physical channel received from the second IP terminal 20, and generates the port control signal. To the port manager 12.

The port manager 12 connects a port connected to the single terminal 30 with a port corresponding to a physical channel allocated by the second IP terminal 20 according to a port control signal received from the controller 14. 2 Set up a voice call between the IP terminal 20 and the single terminal 30.

Meanwhile, when the user selects the conference call button, the second IP terminal 20 holds a voice call with the single terminal 30, generates a conference call start signal, and participates in the conference call. 20) (S 42).

At this time, the second IP terminal 20 queries the gatekeeper 21 for the address information of the third IP terminal 20 participating in the conference call, and receives the address information of the third IP terminal 20 received accordingly. Can be used to send a conference call start signal.

When the conference call start signal is received from the second IP terminal 20, the third IP terminal 20 requests the gateway 11 to establish a virtual channel (S 43).

When the virtual channel setup is requested from the third IP terminal 20, the gateway 11 sets up a virtual channel with the third IP terminal 20 and allocates a physical channel corresponding to the virtual channel.

The gateway 11 transmits the information of the allocated physical channel to the third IP terminal 20 (S44).

In addition, the second IP terminal 20 transmits the information of the physical channel received from the gateway 11 to the second IP terminal 20 that is the subject of the conference call (S45), and the second IP terminal 20 ) Transmits the physical channel information of the third IP terminal 20 to the conference call processing unit 12a (S46).

The conference call processor 12a may include the physical channel information of the third IP terminal 20, the physical channel information of the second IP terminal 20, and the port of the single terminal 30 received from the second IP terminal 20. Using the information, a port control signal is generated.

The port manager 12 is connected to a single terminal 30 and a port corresponding to a physical channel allocated to each IP terminal 20 from the gateway 11 according to a port control signal received from the conference call processor 12a. By connecting the port, a conference call between each IP terminal 20 and a single terminal 30 is set (S 47).

That is, when the port control signal is received from the conference call processor 12a, the port manager 12 corresponds to the port, the single terminal 30 and the second IP terminal corresponding to the physical channel assigned to the third IP terminal 20. A voice call is established between the IP terminals 20 and the single terminals 30 by interconnecting the ports where the voice calls are set.

On the other hand, when the user of each IP terminal 20 selects a predetermined interrupt button, that is, the conference call processing unit 12a is provided between the first IP terminal 20 and the second IP terminal 20. When the interrupt request signal for making a voice call with the first IP terminal 20 is received from the third IP terminal 20 while the voice call is set, the first IP terminal 20 and the second IP are received. The terminal 20 and the third IP terminal 20 generate a port control signal using the information of the physical channel allocated from the gateway 11, and transmit the generated port control signal to the port manager 12. do.

The port manager 12 assigns a port corresponding to the physical channel assigned by the third IP terminal 30 and the second IP terminal 20 according to the port control signal received from the conference call processor 12a. A port corresponding to the received physical channel is connected to establish an interrupted voice call between the second IP terminal 20 and the third IP terminal 20.

Meanwhile, when the user of the first IP terminal 20 selects a preset recording button while the conference call processing unit is in a voice call between the first IP terminal 20 and the second IP terminal 20, that is, When a recording request signal is received from the first IP terminal 10, a recording server connected to the switching system 10 and a port corresponding to a physical channel allocated by the first IP terminal 20 and the second IP terminal 20. The port control signal is generated using the port information (not shown), and the generated port control signal is transmitted to the port manager 12.

The port manager 12 may include a port corresponding to a physical channel allocated to the first IP terminal 20 and the second IP terminal 20 according to a port control signal received from the conference call processor 12a, and the recording server. By connecting the ports, the recording server can record the voice call contents between the first IP terminal 20 and the second IP terminal 20.

In addition, when the user of the IP terminal 20 selects a preset dispatch button, that is, the conference call processing unit 12a analyzes the simultaneous command request signal received from the IP terminal 20, and the called terminal. The multi-party call start signal is generated by the plurality of IP terminals 20 or the single terminal 30, and the generated multi-party call start signal is transmitted to each terminal 20, 30.

Then, the conference call processing unit 12a receives a multi-party call start signal, generates a port control signal using port information of each terminal 20 and 30 that transmits a response signal thereto, and generates the port control signal. The signal is transmitted to the port manager 12.

The port manager 12 connects the ports of the terminals 20 and 30 according to the port control signal received from the conference call processor 12a to establish a multi-party voice call.

That is, the conference call processing unit 12a establishes a channel with the gateway 11 by each IP terminal 20 having received the multi-party call start signal, and connects the information of the physical channel transmitted with each single terminal 30. The port control signal is generated using the port information.

At this time, the conference call processor 12a may receive a multi-party call start signal and generate a port control signal for joining each terminal 20 and 30 to the multi-party call in the order of transmitting the response signal.

The port manager 12 connects the ports of the terminals 20 and 30 participating in the conference call according to the conference call start signal in the order of the port control signal received from the conference call processor 12a.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims.

As described above, according to the present invention, it is possible to provide a multi-party call service between at least one or more IP terminals connected to an exchange system through an IP network without any additional equipment.

In addition, there is an effect that can provide a multi-party call service between the IP terminal connected to the switching system and the IP network, and the general terminal connected to another communication network without any additional equipment.

1 is a block diagram illustrating a configuration of an exchange system that provides a conference call function over a general IP network.

FIG. 2 is an overall block diagram illustrating a configuration of an exchange system providing a conference call function according to a preferred embodiment of the present invention. FIG.

3 is a flowchart illustrating a method of providing a conference call service between IP terminals by an exchange system according to an embodiment of the present invention.

4 is a flowchart illustrating a method of providing a conference call service between an IP terminal and a single terminal by a switching system according to another embodiment of the present invention.

5 is a flowchart illustrating a method of providing a conference call service between an IP terminal and a single terminal by a switching system according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: exchange system 11: gate way

12: port management unit 12a: conference call processing unit

13: communication interface 20: IP terminal

21: gate keeper 22: MCU (Multi-point Control Unit)

Claims (7)

In the switching system connected to at least one terminal, A gateway for setting a channel with a plurality of terminals participating in the conference and providing information on the set channel when a channel setting request signal for a conference call is received from the terminal; Multi-party call service of a switching system including a port management unit for connecting the ports corresponding to the channel set in each terminal by using the channel information of each terminal provided from the gateway, to establish a multi-party call of each terminal Provision device. The method of claim 1, wherein the port management unit, A call processor for identifying a port to be connected to each terminal by using channel information of each terminal provided from the gateway, and generating a port control signal using the identified port information; And a port processing unit for connecting ports connected to each terminal according to a port control signal generated from the call processing unit. The method of claim 1, wherein the terminal, And at least one terminal of an IP terminal connected to the switching system and an IP (Internet Protocol) network or a wired terminal connected to a wired network. The method of claim 1 or 3, wherein the port management unit, If the terminal participating in the conference call is the IP terminal, the port corresponding to the channel information connected to the IP terminal, and if the wired terminal, characterized in that for connecting the wired terminal and the port connected via a wire. Multi-party call service providing device of the switching system. In the call processing method of the switching system connected to a plurality of IP terminals, Setting a channel with each terminal when receiving a channel setting request signal for establishing a conference call from at least one terminal; Providing the set channel information to each terminal, and identifying a port corresponding to the set channel with each terminal; And connecting each of the ports corresponding to the set channel with each terminal to establish a conference call between the respective terminals. The method of claim 5, wherein the terminal, And at least one terminal of an IP terminal connected to the switching system and an IP (Internet Protocol) network or a wired terminal connected to a wired network. The method of claim 5 or 6, wherein the port connection, If the terminal is the wired terminal, the multi-party call of the switching system, characterized in that further comprising the step of connecting to the port and the port corresponding to the established channel and the IP terminal and the wired network via the wired network. How we deliver the service.