KR20030000472A - Method for Voice service using ATM Adaption Layer 2 based Voice over ATM in ATM - Google Patents

Abstract

PURPOSE: A voice service method using a VTOA(Voice and Telephony Over ATM(Asynchronous Transfer Mode)) based on an AAL(ATM Adaption Layer) in an ATM network is provided to perform interworking of AAL2 functions between PSTN/N-ISDN(Public Switched Telephone Network/narrowband aspects of Integrated Service Digital Network) and the ATM network. CONSTITUTION: An originating VTOA gateway(100a) receives a call requesting a VTOA service including a VTOA ID for a service from an originating user terminal(46a). The originating VTOA gateway(100a) transmits a call requesting an incoming number to the originating user terminal(46a). The originating VTOA gateway(100a) receives the incoming number of an incoming party from the originating party. The originating VTOA gateway(100a) selects an incoming VTOA gateway(100b) through the incoming number and transmits the incoming number to the incoming VTOA gateway(100b) through an ATM network(60). The incoming VTOA gateway(100b) sets up connection with an incoming user terminal(46c) corresponding to the incoming number. The originating VTOA gateway(100a) receives signals including voice signals from the originating user terminal(46a). The originating VTOA gateway(100a) converts the voice signals into ATM AAL2 cells for the transmission to the incoming VTOA gateway(100b). And the incoming VTOA gateway(100b) restores the received ATM AAL2 cells to original voice signals for the transmission to the incoming user terminal(46c) through an incoming channel.

Description

Method for Voice service using ATM Adaption Layer 2 based Voice over ATM in ATM}

The present invention relates to a method of providing a voice service by interworking a voice reception technology of an asynchronous transfer mode (hereinafter referred to as ATM) network with a time division multiplexing (hereinafter referred to as TDM) network. More specifically, the present invention relates to a voice service method using an asynchronous transmission mode adaptive layer-based voice reception technology of an asynchronous transmission mode (ATM) network for packetizing and transmitting voice signals in a telephone service.

Conventional telephony service is a circuit linking service by circuit switching, which establishes a physical communication channel before transmitting voice data by assigning a call unit line and establishes a channel having a fixed data rate between a receiver and a sender. Service to send and receive voice data.

This telephone service method is to monopolize a specific channel so that other users cannot use the line between the callers during a call, while both the transmitting and receiving parties are not transmitting voice signals (while the callers do not talk to each other). ) Also occupies the circuit and has a serious disadvantage of wasting resources at the network level.

Therefore, in order to increase the efficiency of network resources through the use of idle lines, a method of providing a telephone service by applying a packet switching method that packetizes a voice signal and sets a circuit in packet units has been studied.

In the conventional ATM technology, a voice receiving method has a disadvantage in that efficiency of network resources is not achieved by converting voice data of an existing TDM network into an ATM cell without compression and providing functions such as idle line or silence cancellation. In addition, the situation is not activated because the service that can provide economically to the subscriber is not made.

Therefore, in view of the above-described problems, the present invention provides a system for voice and telephony over ATM (VTOA) utilizing ATM adaptation layer 2 (hereinafter referred to as AAL2). Interworking AAL2 function between Public Switched Telephone Network (hereinafter referred to as PSTN) / Narrowband aspects of Integrated Service Digital Network (hereinafter referred to as N-ISDN) and ATM network, Accordingly, an object of the present invention is to provide a voice service method using an asynchronous transmission mode adaptation layer based voice reception technology of an asynchronous transmission mode (ATM) network providing a voice service.

1 is a diagram illustrating a telephone network using a VTOA system applied to the present invention.

2 is a block diagram of the VTOA system shown in FIG.

3 is a diagram illustrating a multiplexing method of a speech signal in the VTOA system of FIG.

4 is a flowchart illustrating a process of transmitting a voice signal according to FIG. 1.

5 is a diagram illustrating the construction of a domestic ATM network using a VTOA gateway including the VTOA system shown in FIG. 1.

FIG. 6 is a flowchart illustrating a process of providing a VTOA service illustrated in FIG. 5.

7 is an international ATM network configuration using a VTOA gateway including the VTOA system shown in FIG.

FIG. 8 is a flowchart illustrating a VTOA service providing process by the international VTOA gateway shown in FIG. 7.

9 is a diagram illustrating the construction of a domestic ATM network using VTOA trunking including the VTOA system shown in FIG. 2.

10 is an international ATM network configuration using VTOA trunking including the VTOA system shown in FIG.

<Description of Symbols for Major Parts of Drawings>

6a to 6c, 10: VTOA system 12: mux / demux

14: channel identifier management unit 5: ATM network

18a, 18b: codec / echo canceller 20a, 20b: SSCS

22a, 22b: AAL2 CPS 30: ATM AAL2 cell

32a to 32i: audio signal 34a to 34d: silent signal

36a to 36e: voice data packet

20a ~ 20c, 46a ~ 46d, 50a ~ 50g, 72a ~ 72h, 76a ~ 76g: user terminal

4a ~ 4c: TDM System 40a ~ 40d: User Network

44a ~ 44d: PSTN / ISDN 48a ~ 48d: Private Exchange

60, 62a ~ 62b: Domestic ATM network 64a ~ 64b: International ATM gateway

70: International ATM Network 75: No.7 Signaling Network

100a to 100b: VTOA Gateway 100c to 100d: International VTOA Gateway

200a ~ 200b: VTOA Trunking 200c ~ 200d: International VTOA Trunking

In the method for providing a telephone service using a VTOA gateway providing a VTOA service based on AAL 2 in an asynchronous transmission mode (ATM) network for achieving the above object,

A first step of receiving, by the calling VTOA gateway, a VTOA service request call including a VTOA identification number which is a service identification number from the caller's user terminal;

A second step of sending, by the originating VTOA gateway, a called party request call to the caller's terminal;

A third step of receiving a called number, which is a called party's telephone number, from the caller;

Selecting a destination VTOA gateway through the received destination number and transmitting the destination number to the destination VTOA gateway through an ATM network;

A fifth step of establishing a connection with the called party's user terminal corresponding to the called number;

A sixth step of receiving, by the calling gateway, a signal including a voice signal from the caller's user terminal;

A seventh step of the calling VTOA gateway converting the voice signal into an ATM AAL2 cell and transmitting the converted voice signal to a called party VTOA gateway;

And an eighth process of recovering the ATM AAL2 cell received by the called party's VTOA gateway to the original voice signal and transmitting the received ATO to the called party's terminal through the called party's channel.

In addition, in the method for providing a telephone service using VTOA trunking that provides a VTOA service based on AAL 2 in an asynchronous transmission mode (ATM) network for achieving the above object,

An eleventh step of the originating VTOA trunking receiving an incoming number which is the called party's telephone number from the calling user's user terminal;

The originating side VTOA trunking establishes a connection with the terminating side VTOA trunking through the terminating number, and transmits the terminating number to the terminating side VTOA trunking through an ATM network;

A thirteenth step of establishing, by the called-side VTOA trunking, a connection with the called user's user terminal corresponding to the called number;

A fourteenth step of receiving, by the calling side VTOA trunking, a signal including a voice signal from the caller's user terminal;

A fifteenth step in which the calling party VTOA trunking generates an ATM AAL2 cell through a voice signal and transmits it to the called party VTOA trunking;

And a sixteenth process of recovering the ATM AAL2 cell received by the called party VTOA trunking to the original voice signal, and transmitting the restored voice signal to the called party terminal through the called party channel.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a phone network configuration using the VTOA system (6a ~ 6c) applied to the present invention, provides a telephone service to the user by using the VTOA system (6a ~ 6c), user terminals (2a ~ 2c) (for example, a telephone , A wireless terminal, and the like), a TDM system 4a to 4c, and a VTOA system 6a to 6c.

The user terminals 2a to 2c transmit a terminal number and a voice signal of a receiver to which a user (sender) wants to talk to the TDM system 4a to 4c, and receive a voice signal from the TDM system 4a to 4c. Output

In addition, the TDM system 4a to 4c sequentially multiplexes the receiver terminal number and voice signals generated in multiple voice channels through a 24 channel method (Telephone set 1: T1) or a 30 channel method (E1). To send.

The VTOA systems 6a to 6c of FIG. 1 receive multiplexed voice signals from the originating TDM systems 4a to 4c, allocate appropriate CID values, and generate voice data packets. Then, the connection is established such that the called user's user terminals 2a to 2c are called through the received terminal number. Also, the compressed voice data packet is recovered and the transmission channel is recognized according to the CID value, and the voice signal is transmitted to the called channel.

FIG. 2 is a block diagram of the VTOA system 6a to 6c shown in FIG. 1, which is a block diagram of a VTOA system 10 that provides a plain old telephone service (POST) such as conventional telephone-grade voice and fax through an ATM network. Indicates.

FIG. 2 illustrates a multiplexer (mux) / demux (Depmultiplexer: Demux) 12, a channel identifier management unit 14, and an AAL5 CPS 16 codec / echo control. 18a, 18b, SSCS 20, 20b, and AAL2 CPS 22a, 22b.

The mux / demux 12 of FIG. 2 multiplexes and demultiplexes a voice signal transmitted and received.

The channel identifier manager 14 allocates a channel identifier (hereinafter referred to as a CID), which is an identifier for distinguishing a channel received through the voice trunk (T1, E1, etc.), according to the voice signal.

The AAL5 CPS 16 receives a TDM signal, which is a voice signal, and transmits the TDM signal to the ATM 5 network through ATM Adaption Layer 5 (AAL5), which is one of the ATM adaptation layers.

The codec / eco controllers 18a and 18b compress a voice signal and perform echo cancellation on a call between a transmitter and a receiver.

The SSCSs 20a and 20b and the AAL2 CPSs 22a and 22b receive a compressed signal to generate an ATM AAL2 cell.

The VTOA system 10 shown in FIG. 2 is basically based on an ATM technology that guarantees quality of service, and provides end-to-end connection service using AAL2. In particular, by using AAL2 which can efficiently use resources through statistical multiplexing, allocate bandwidth as many as the number of users, and flexibly cope with the network situation, it is possible to effectively process variable data such as voice and video.

FIG. 3 is a diagram illustrating a multiplexing method of a voice signal in the VTOA system 10 of FIG. 2. The ATM signal is compressed by compressing the voice signal input for each channel ch 1 to ch 5. It shows how to generate.

In the method of generating the ATM AAL2 cell 30 in FIG. 3, a short variable length voice data packet is allocated to the compressed voice signals 32a to 32i by assigning an appropriate CID value to the compressed voice signals 32a to 32i. Produces (36a-36e).

However, in the case of the silent signals 34a to 34e in which both the transmitter and the receiver do not transmit voice, they are removed without generating voice data packets 36a to 36e.

The ATM AAL2 cell 30 is generated through the generated packets 36a to 36e, and one ATM ALL2 cell 30 is formed by collecting a plurality of voice data packets 36a to 36e. It is formed of a proper number of packets to fit the size of).

4 is a flowchart illustrating a process of transmitting the voice signals 32a to 32i according to FIG. 1. The VTOA system 6a to 6c generates an ATM AAL2 cell 30 through the voice signal received from the caller and then sends it to the called party. Indicates the process of transmission.

First, the source VTOA system 6a to 6c receives a voice signal from the caller's user terminals 2a to 2c through the TDM systems 4a to 4c (S2). The received voice signals 32a to 32i are compressed (S4), and CID values for the compressed voice signals 32a to 32i are allocated (S6).

Using these voice signals, short variable length voice data packets 36a to 36e are generated (S8), and an ATM AAL2 cell 30 composed of one or more generated voice data packets 36a to 36e is generated (S10). ). Then, the generated ATM AAL2 cell 30 is transmitted to the receiving side VTOA systems 6a to 6c through the ATM network 5 (S12), and the receiving side VTOA system 6a to receiving the ATM AAL2 cell 30 is received. 6c) restores the voice data packets 36a to 36e in the compressed ATM AAL2 cell 30 again to generate the original voice signals 32a to 32i (S14).

Subsequently, the destination channel is selected through the CID value of the restored voice signal (S16), and the voice signals 32a to 32i are transmitted to the destination TDM system 4a to 4c through the selected destination channel (S18).

Finally, the called party TDM system 4a to 4c transmits the received voice signals 32a to 32i to the called party's terminals 2a to 2c (S20).

FIG. 5 is a configuration diagram of a domestic ATM network 60 using the VTOA gateways 100a and 100b including the VTOA system 1 shown in FIG. 2, and uses the VTOA gateways 100a and 100b in the domestic ATM network 74. Shows a network diagram for providing a call connection service between a transmitter and a receiver.

5 is connected to the user network (40a, 40b) using the VTOA service and the PSNT / ISDN (44a, 44b) for providing telephone service and the domestic ATM network 60 and PSNT / ISDN (44a, 44b) It is composed of VTOA gateways (100a ~ 100b) for providing a VTOA service through the network (60).

The user networks 40a and 40b of FIG. 5 share a certain number of external telephone lines used by a user terminal 46a to 46d of a user who uses a VTOA service and a general company, and an internal user to whom an extension is connected. It consists of a Private Branch eXchange (PBX) 48a, 48b, which is a telephone exchange system for automatically connecting telephones.

The VTOA service providing method through the VTOA gateways 100a and 100b of FIG. 5 is a configuration of a so - called PSTN-ATM-PSTN service , and a new identification number is required for this purpose.

That is, when the VTOA gateway 100a, 100b receives the VTOA identification number, which is the service identification number, from the user terminals 46a to 46d through the PSTN / ISDN 44a and 44b to provide the VTOA service, the VTOA service procedure guide broadcaster. The voice announcement is sent to the user terminals 46a to 46d.

Then, the user transmits the called number (the recipient's terminal telephone number) to the VTOA gateways 100a and 100b according to the announcement broadcast from the VTOA gateways 100a and 100b through the PSTN / ISDN 44a and 44b.

The VTOA gateways 100a and 100b select the VTOA gateways 100a and 100b of the user terminal corresponding to the called number through the domestic ATM network 60, and provide telephone service by the process shown in FIG. .

FIG. 6 is a flowchart illustrating a process of providing a VTOA service illustrated in FIG. 5, and illustrates a process of establishing a connection between a caller and a called party through the VTOA gateways 100a and 100b.

First, since the calling party VTOA gateway 100a linked to the calling network of the calling party PSTN / ISDN 44a is recognized by the VTOA identification number, which is a service identification number, the calling party VTOA gateway 100a is called by the caller's user terminal ( 46a) receives the VTOA service request call VTOA identification number through the PSTN / ISDN 44a (S20).

Subsequently, the calling party's VTOA gateway 100a receiving the VTOA identification number transmits a guide broadcast requesting the called party's number transmission to the caller's user terminal 46a via the PSTN / ISDN 44a (S22). Then, the caller transmits the called number (phone number of the receiver terminal) to the VTOA gateway 100a through the PSTN / ISDN 44a according to the announcement broadcast (S24).

The calling party VTOA gateway 100a receiving the called party number retrieves the called party VTOA gateway 100b through the called party number and establishes a connection to the selected called party VTOA gateway 100b through the domestic ATM network 60 ( S26).

Through the set connection, the calling party VTOA gateway 100a transmits the called number to the called party VTOA gateway 100b (S28). Then, the destination VTOA gateway 100b establishes a connection with the called party's user terminal 46c corresponding to the called number through the PSTN / ISDN 44b (S30).

The sender and the receiver send and receive voice signals 32a through 32i through the connection established by the above process, and the process of transmitting and receiving voice signals 32a through 32i is performed through the VTOA gateways 100a and 100b. Follow the steps to send.

Referring to the voice signal transmission process using the VTOA gateways 100a and 100b according to FIG. 4, first, the calling VTOA gateway 100a transmits the voice signals 32a to 32i that the caller wants to transmit to the called party. Received through). The ATM AAL2 cell 30 is generated through the received voice signals 32a to 32i and transmitted to the receiving VTOA gateway 100b through the domestic ATM network 60. As such, the destination VTOA gateway 100b receiving the ATM AAL2 cell 30 restores the ATM AAL2 cell 30 to the original voice signals 32a to 32i to correspond to the called party's user terminal ( 46c).

FIG. 7 is a configuration diagram of the international ATM network 70 using the international VTOA gateways 100c and 100d including the VTOA system 1 shown in FIG. 2, and the method for providing a VTOA service is similar to that of FIG. 5.

The international VTOA gateways 100c and 100d of FIG. 7 are located between the PSTN / ISDNs 44c and 44d and the international ATM gateways 64a and 64b, and the voice signals from the user terminals 50a to 50g are transmitted to the PSTN / ISDN. Received through 44c, 44d) generates ATM AAL2 cell 30, restores the ATM AAL 2 cell 30 to the original voice signal to the user terminal (50a ~ 50g) through the PSTN / ISDN (44c, 44d) send.

The international ATM gateways 64a and 64b receive the ATM AAL2 cell 30 from the international VTOA gateways 100c and 100d, transmit and receive the ATM AAL 2 cell 30 through the international ATM network 70, and the called party. The international ATM gateways 64a and 64b transmit the ATM AAL 2 cells 30 received from the originating international ATM gateways 64a and 64b to the corresponding destination international VTOA gateways 64a and 64b.

FIG. 8 is a flowchart illustrating a VTOA service providing process by the international VTOA gateways 100c and 100d shown in FIG. 7.

First, the destination international VTOA gateway (100c, 100d) receives the VTOA identification number from the caller's user terminal (50a) through the PSTN / ISDN (44c) (S40). Subsequently, a guide broadcast requesting an input of a called number is sent to the caller terminal 50a (S42), and a called number is received from the caller terminal 50a (S44).

Then, the received destination number is transmitted to the calling party international ATM gateway 64a (S46), and the calling party international ATM gateway 64a sends the called party number through the international ATM network 70 to the international ATM gateway of the called country. Transfer to 64b (S48).

The called party's international ATM gateway 64b transmits the called number to the called party's international VTOA gateway 100d (S50), and the international VTOA gateway 100d transmits the called party's number corresponding to the called number through the PSTN / ISDN 44d. The connection with the user terminal is established (S52).

By the above process, the voice signal 32a to 32i is transmitted / received between the sender and the receiver through the connection established between the caller and the called party, and the process of transmitting and receiving voice signals 32a to 32i by the international VTOA gateways 100c and 100d is performed. It is transmitted and received by the process shown in FIG.

When the VTOA service is applied to the international ATM network 70 as shown in FIG. 7, the user provides the VTOA service without applying the VTOA system 10 to the gateway of the domestic ATM networks 62a to 62b as shown in FIG. I can receive it.

5 to 8 illustrate a VTOA service method for receiving a VTOA service request, which is a VTOA identification number, from a user at a VTOA gateway and providing a VTOA service by announcement broadcast. On the contrary, the VTOA service method of FIGS. 9 to 10 described below relates to a VTOA service method in which VTOA trunking immediately receives a recipient number from a user and immediately provides a VTOA service without recognizing a VTOA identification number. same.

FIG. 9 is a configuration diagram of a domestic ATM network 60 using VTOA trunking 200a and 200b including the VTOA system 10 shown in FIG. 2. The VTOA system 1 may be used for trunking in a domestic ATM network 60. ) And the VTOA service is provided through interworking with the No. 7 signal network 75.

The VTOA trunking 200a and 200b shown in FIG. 9 establishes a connection between a caller and a called party, compresses a voice signal to generate a voice packet, and restores the compressed voice data packet to an original voice signal.

The VTOA trunking 200a, 200b receives the called number and voice signal from the caller's user terminals 72a through 72h through trunks such as E1 or T1.

Then, the VTOA trunking 200a, 200b compresses the voice signal of each channel, generates the ATMAAL2 cell 30, and uses the called number to communicate with the No. 7 signal network 75 or the domestic ATM network 60. It establishes a connection with the VTOA trunking 200a, 200b of the called party through interworking.

In addition, the VTOA trunking 200a, 200b transmits the generated ATM AAL2 cell 30 to the destination VTOA trunking 200a, 200b through the established connection.

Then, the called-side VTOA trunking 200a, 200b establishes a connection to the called party's user terminals 72a to 72h corresponding to the called number, and restores the received ATM AAL2 cell 30 to the original voice signal.

The called-side VTOA trunking 200a, 200b transmits the restored voice signal to the called party's user terminals 72a to 72h through the corresponding TDM exchange, thereby establishing a call connection between the calling party and the called party.

As shown in FIG. 9, a method of providing a VTOA service by VTOA trunking in a domestic ATM network 60 includes static trunking and switched trunking.

First, fixed trunking is a method of applying a VTOA service to a trunking section in which a connection is already established, such as trunking in a toll exchange period.

That is, the VTOA trunking 200a, 200b of the transmitting and receiving side is directly connected, and each VTOA trunking 200a, 200b receives VTOA channel data which is a fixed channel number for other VTOA trunking 200a, 200b other than its own. Built.

Accordingly, the calling party's VTOA trunking 200a refers to the channel number in the VTOA channel data and communicates with the called party's VTOA trunking 200a through the channel number of the called party's VTOA trunking 200a corresponding to the called number. You can now establish a connection.

On the other hand, dynamic trunking is not a connection is set up, such as replacement of the Toll exchange, and a method for establishing a proper connection during the call, a separate system for interworking with the existing signal network 75 is required.

That is, each VTOA trunking 200a, 200b does not embed a fixed channel number for other VTOA trunking 200a, 200b other than its own, but is assigned a channel number each time a connection is attempted. Therefore, the VTOA trunking 200a of the calling party is assigned an arbitrary channel number for the VTOA trunking 200b of the called party, and attempts to connect through the assigned channel number.

In the fixed trunking, signals are terminated and processed at the TDM side exchange, whereas dynamic trunking requires a system for signal interworking between the TDM side exchange and the ATM side VTOA system for signal processing.

FIG. 10 is a block diagram of an international ATM network 70 using the international VTOA trunk systems 200c and 200d including the VTOA system 10 shown in FIG. 2, illustrating an international ATM network 70 trunk interface of an international TDM gateway exchange. A method of accommodating international VTOA trunking systems 200c and 200d to provide VTOA services is described.

Looking at the VTOA service providing method using the international VTOA trunking (200c, 200d) of Figure 10, first, the calling party international VTOA trunking (200c) receives the voice signal (32a ~ 32i) from the caller terminal (76a ~ 76g).

Then, the received voice signals 32a to 32i are compressed to generate an ATM AAL2 cell 30, and the generated ATM AAL2 cell 30 is transferred through the international ATM gateways 200c and 200d and the international ATM network 70. Send to the called party's international VTOA trunking (200d).

The receiving party's international VTOA trunking 200d receiving the ATM AAL2 cell 30 restores the ATM AAL2 cell 30 to the original voice signals 32a to 32i and transmits it to the called user's user terminal 76a to 76g. do.

As described above, according to the present invention, by providing a VTOA service through a gateway including a VTOA system, there is an advantage of providing circuit-saving effect due to bandwidth reduction due to voice compression and providing high quality of a conventional voice telephone grade. have. In addition, it can be used for voice calls of general or corporate with a lot of international calls.

In addition, by providing a VTOA service through the trunking including the VTOA system, it is possible to efficiently use the trunk by reducing the bandwidth of the trunk between the TDM switch by voice compression. In addition, there is an advantage of increasing circuit efficiency, reducing new investment, and replacing the existing voice leased line by reducing bandwidth of trunking of the STM exchange period. In addition, it is a service that can be considered in terms of activation and utilization of an existing ATM network.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and changes should be considered to belong to the following claims. something to do.

Claims (10)

A method for providing telephone service using a VTOA gateway providing a VTOA service based on AAL 2 in an asynchronous transmission mode (ATM) network, A first step of receiving, by the calling VTOA gateway, a VTOA service request call including a VTOA identification number which is a service identification number from the caller's user terminal; A second step of sending, by the originating VTOA gateway, a called party request call to the caller's terminal; A third step of receiving a called number, which is a called party's telephone number, from the caller; Selecting a destination VTOA gateway through the received destination number and transmitting the destination number to the destination VTOA gateway through an ATM network; A fifth step of establishing a connection with the called party's user terminal corresponding to the called number; A sixth step of receiving, by the calling gateway, a signal including a voice signal from the caller's user terminal; A seventh step of the calling VTOA gateway converting the voice signal into an ATM AAL2 cell and transmitting the converted voice signal to a called party VTOA gateway; And an eighth process of recovering the ATM AAL2 cell received by the called party's VTOA gateway to the original voice signal and transmitting the received ATO signal to the called party's terminal through the called party's channel. Voice service method based on voice acceptance technology (VTOA). The method of claim 1, Converting to the ATM AAL2 cell of the seventh process, Determining whether a signal received from the caller terminal is a silent signal rather than a voice signal; If the received signal is a silent signal, removing the silent signal; If the received signal is a voice signal instead of a silent signal, generating a variable length voice data packet through the voice signal; And And generating an ATM AAL2 cell composed of the one or more voice data packets. 16. A voice service method using a voice receiving technology (VTOA) based on an asynchronous transmission mode adaptation layer of an asynchronous transmission mode network. The method of claim 2, The process of generating the voice data packet, Compressing a voice signal received from the caller terminal; Assigning a channel identifier to each compressed voice signal; And Generating a voice data packet by packetizing the voice signal; and a voice service method using a voice receiving technology (VTOA) based on an asynchronous transmission mode adaptation layer of an asynchronous transmission mode network. The method of claim 1. The process of transmitting the voice signal of the eighth process to the called party terminal, Restoring a voice data packet in the compressed ATM AAL2 cell to an original voice signal; And Voice service using a voice adaptation technology (VTOA) based on the asynchronous transmission mode adaptation layer of the asynchronous transmission mode network, characterized in that it comprises the step of transmitting the voice signal to the receiver terminal through the channel identifier value of the restored speech signal. Way. A method for providing telephone service using VTOA trunking that provides a VTOA service based on AAL 2 in an asynchronous transmission mode (ATM) network, An eleventh step of the originating VTOA trunking receiving an incoming number which is the called party's telephone number from the calling user's user terminal; The originating side VTOA trunking establishes a connection with the terminating side VTOA trunking through the terminating number, and transmits the terminating number to the terminating side VTOA trunking through an ATM network; A thirteenth step of establishing, by the called-side VTOA trunking, a connection with the called user's user terminal corresponding to the called number; A fourteenth step of receiving, by the calling side VTOA trunking, a signal including a voice signal from the caller's user terminal; A fifteenth step in which the calling party VTOA trunking generates an ATM AAL2 cell through a voice signal and transmits it to the called party VTOA trunking; And a sixteenth process of recovering the ATM AAL2 cell received by the called party VTOA trunking to the original voice signal and transmitting the restored voice signal to the called party terminal through the called party channel. A voice service method using VTOA based on the asynchronous transmission mode adaptation layer. The method of claim 5, In the step 12 of establishing a connection with the called-side VTOA trunking, Referencing VTOA channel data, which is a fixed channel number for each embedded VTOA trunking; Retrieving a channel number of a called-side VTOA trunking of the VTOA channel data through the called number; And Establishing a connection with the called party's VTOA through a channel number selected through the channel number search step; and using a voice adaptation technology (VTOA) based on an asynchronous transmission mode adaptation layer of the asynchronous transmission mode network. Service method. The method of claim 5, In the step 12 of establishing a connection with the called-side VTOA trunking, Receiving an arbitrary channel number for the called party's VTOA trunking through interworking with an existing signaling network; And And establishing a connection with the called-side VTOA trunking through the channel number. The voice service method using a voice receiving technology (VTOA) based on the asynchronous transmission mode adaptation layer of the asynchronous transmission mode network. The method of claim 5, Generating the ATM AAL2 cell of the fifteenth process, Determining whether a signal received from the caller terminal is a silent signal rather than a voice signal; If the received signal is a silent signal, removing the silent signal; If the received signal is a voice signal, generating the voice signal as a variable length voice data packet; And And generating an ATM AAL2 cell composed of the one or more voice data packets. 16. A voice service method using a voice receiving technology (VTOA) based on an asynchronous transmission mode adaptation layer of an asynchronous transmission mode network. The method of claim 8, The process of generating the voice data packet, Compressing a voice signal received from the caller terminal; Assigning a channel identifier which is a transmission channel number to each of the compressed voice signals; And Generating a voice data packet by packetizing the voice signal; and a voice service method using a voice receiving technology (VTOA) based on an asynchronous transmission mode adaptation layer of an asynchronous transmission mode network. The method of claim 5, In the process of transmitting the voice signal to the called party terminal of the 16th step, Restoring a voice data packet in the compressed ATM AAL2 cell to an original voice signal; And Voice service using a voice adaptation technology (VTOA) based on the asynchronous transmission mode adaptation layer of the asynchronous transmission mode network, characterized in that it comprises the step of transmitting the voice signal to the receiver terminal through the channel identifier value of the restored speech signal. Way.