KR100237457B1 - Apparatus and method of for processing telephone service in asynchronous transfer mode network - Google Patents

Abstract

The voice service device of the private ATM switching network includes a phone terminal device having an AMT interface that performs an AMT matching function with a telephone, a phone number, an AMT address, a voice control channel ID, and a voice channel. It is composed of a switch device that is connected to the public network, and has a table connected by ID, etc., and a voice channel and a voice channel for transmitting and receiving pure voice data when transmitting and receiving ATM format voice data between telephone terminal devices and the switch device. Independently configured voice control channel for transmitting and receiving signaling data for control.

Description

Telephone service device and method in asynchronous transmission mode network

The present invention relates to an apparatus and method for telephone service in an asynchronous transmission mode network, and more particularly, to an apparatus and method for providing telephone service in connection with a public telephone network in a private switching network based on an asynchronous transmission mode.

In general, when transmitting and receiving data in an Asynchronous Transfer Mode Network (hereinafter referred to as ATM network), a connection between both ends should be established first. At this time, the connection setting is possible by using the protocol already promised by both devices, and such a protocol is set for each layer according to the corresponding function. In the ATM network, connection establishment is recommended using Q.2931 or ATM UNI.

However, as the above protocols such as ATM UNI and Q.2931 are defined for general connection establishment purposes, in order to be connected with a specific service, a protocol suitable for the service must be additionally created. For example, in a data private network such as a local area network (LAN), an additional network protocol application such as LAN Emulation (LANE) may be additionally used for the network.

In order to provide a telephone service in the ATM network, it is effective to additionally make and use a protocol suitable for the telephone service. In particular, the current public switched telephony network (PSTN) type of telephone service can be used in the ATM network, and the telephone service can be provided in conjunction with the current public telephone network.

In general, when an analog telephone is connected to an ATM network, the analog information is sampled through one virtual channel, and then converted into a PCM (Pulse Code Modulation) format. At this time, during the telephone call service, not only voice information but also signaling information (flash information, DTMF tone information, etc.) generated during a conversation by the user are transmitted through the same virtual channel. Therefore, the ATM switch needed a separate device for detecting signaling information included in the virtual channel. In addition, if a computing device such as a personal computer (PC) intends to provide a voice service through a telephone, a device such as a tone generator has to be used. In particular, when using an analog phone in a private switching network composed of the ATM switch, there is a problem in that a separate device for detecting a signal is added to the ATM switch when transmitting a voice and a signal through one virtual channel.

Accordingly, an object of the present invention is to provide an apparatus and method for integrating a computer network and a telephone network in a private switching network to service a telephone function based on ATM technology.

It is another object of the present invention to provide an apparatus and method for establishing a voice channel and a voice control channel between a switch device and a phone terminal device for a telephone service in an ATM network, and transmitting a signaling related to the voice channel through the voice control channel. have.

In order to achieve the above object, a voice service device of a private ATM switching network according to an embodiment of the present invention includes an ATM interface unit for performing an ATM matching function with a telephone, and a telephone terminal device having a telephone function, and a telephone. A number, ATM address, voice control channel ID, voice channel ID, etc. are provided with a link table, a switch device connected to the public network, and voice data in the ATM format between the telephone terminal devices and the switch device. A voice channel for transmitting and receiving pure voice data and a voice control channel for transmitting and receiving signaling data for controlling the voice channel are independently configured.

1 is a diagram illustrating a channel configuration between a subscriber and a multi-service switching system for telephone service in an asynchronous transmission mode network.

FIG. 2 is a diagram illustrating a configuration of a network interface unit in FIG. 1. FIG.

3 is a diagram illustrating a normal telephone call setup procedure when an external incoming call is generated in the same configuration as in FIG.

4 is a flowchart illustrating a call setup procedure as shown in FIG.

FIG. 5 is a diagram illustrating a call setup procedure for processing when an outgoing signal is generated in the configuration as shown in FIG.

FIG. 6 is a flowchart illustrating a call signal setting procedure as illustrated in FIG. 5.

7 is a diagram illustrating a format of a message communicated in call setup.

8 is a diagram illustrating the structure of a table linking information for a telephone call service in an asynchronous transmission mode network.

The telephone service method according to an embodiment of the present invention can execute a telephone call setup and service without a separate device for generating or detecting analog signal information in a telephone terminal device and an ATM switching network in a private switching network based on ATM. To this end, in the exemplary embodiment of the present invention, two voice channels, such as a voice channel for voice transmission and a voice control channel for transmitting signaling information such as flash and tone information, are used for a telephone call in an ATM network. Of virtual channels. Only voice PCM data is transmitted through the voice channel, and information for controlling the voice channel, such as hook on / off status information, ring information, tone information, and flash information, is transmitted along with the channel ID through the voice control channel. . The voice channel information has a characteristic that the amount is very small while real time and order should be guaranteed. The switch device connected to the telephone terminal provides the required services such as changing the telephone connection, recording to the mailbox while monitoring through the voice control channel at all times.

As shown in FIG. 1, transmitting and receiving voice data between a multi-service switching equipment 20 for providing a telephone service in a private ATM network and a telephone terminal device 10 having an ATM adapter card 11. And a virtual channel such as a voice channel 31 for controlling the voice channel 31 and a voice control channel 32 for controlling the voice channel 31. The telephone 12 is connected to the network interface 11 of the telephone terminal device 10. In this case, the voice control channel 32 transmits a hook on / off status, a dual tone multi-frequency signal, a ring information, a voice stream channel ID, and the like.

In FIG. 1, the switch device 20 is a switch device that can be connected to a switch PSTN, an integrated service digital network (ISDN), the Internet, and the like. The phone terminal device 10 is a terminal having a telephone function and is connected to a telephony hub and a telephone. PCs, PCs containing phone applications, and the like. As shown in FIG. 1, a voice channel 31 and a voice control channel 32 are set between the switch device 20 and the telephone terminal device 10 to provide a telephone service.

Multiple voice channels 31 may be generated between the switch device 20 and the telephone terminal device 10 as necessary. The signaling information for such a plurality of voice channels are all transmitted through one voice control channel 32. The tone information generated by the telephone 12 is interpreted by the network interface unit 11, converted into digital information, and transmitted to the switch device 20 through the voice control channel 32. The tone information is delivered to the switch device 20 as soon as it is generated, and the switch device 20 collects this information to generate meaningful information (eg, destination address, etc.).

The voice channel 31 and the voice control channel 32 may be set to a switched virtual channel (hereinafter referred to as SVC) and a permanent virtual channel (hereinafter referred to as PVC). At this time, the voice control channel is preferably set to PVC because the telephone terminal device 10 should always be operated when the reception device is in a standby state. The switch device 20 operates a database that links ATM addresses, telephone numbers, IP addresses, and the like. The terminal of the ATM address with the telephone number means that a device for telephone service is provided. Such terminal devices include a PC, a PC connected to a telephone, and a telephony hub. Since the IP address is also linked, it is possible to make a telephone call over the Internet.

FIG. 2 is a diagram illustrating a configuration of a network interface card according to an embodiment of the present invention. As shown in FIG. 2, a packet and voice stream is installed in a telephone terminal device 10 to install an ATM cell. ) To send to PC and phone respectively.

Referring to FIG. 2, when data is input from the switch device 20, it is checked whether the information received through the ATM layer is signaling channel setting information, and if the data is stored, the data is stored in a packet memory on a desktop. The controller of the PC handles this. In FIG. 2, a voice channel and a voice control channel are distinguished. The message of FIG. 7 described below is generated and transmitted via the voice control channel or the message of FIG. 7 is received from the switching device 20. When a call request message is received from the switch device 20 through the voice control channel 32, the telephone 12 rings to indicate that an incoming call has been generated. At this time, if the telephone apparatus 12 is not hooked off, it cancels the message reception and ends. However, when the telephone 12 hooks off, voice channel 31 is connected to the telephone 12 to receive voice data. In FIG. 2, the hatched portion is a tel-line interface, and the AAL1 processor 77 performs a function of converting data between the ATM layer and the telephone interface unit.

Referring to the operation of the network interface unit 11 having the above configuration, when the telephone 12 is hooked off and the hook-off state is input to the central processing unit 51 of FIG. 2, the switch device 20 and the voice control channel 32 are set up. 20, the message 200 (Switch_Ready) shown in FIG. 7 is transmitted, and then waits for a response. When the response message 201 (Res_Ready) shown in Fig. 7 is transmitted from the switch device 20, the voice channel 31 is set up, and the message 202 (Vchannel_Setup) shown in Fig. 7 with voice channel information is transmitted to the switch device 20. When the voice channel 31 and the voice control channel 32 are set up between the telephone 12 and the switch device 20 in this procedure, the tone generator 83 of FIG. 2 generates a dial tone and waits for the called party number to be input. The destination telephone number, which the caller inputs, is translated through the DTMF detector 85 of FIG. The central processing unit 51 includes this telephone number information in the message 204 (Digit_Transmit) shown in Fig. 7 and transmits it to the switching device 20 through the voice control channel 32.

An embodiment of the present invention provides a call setup procedure as shown in FIGS. 3 and 5 and a telephone connection setup method as shown in the algorithm of FIGS. 4 and 6 through the voice control channel 32 and the voice channel 31. Here, voice data for the telephone is transmitted through the voice channel 31, and all other signals and control information are transmitted through the voice control channel 32. The messages shown in FIGS. 3 and 5 are transmitted through the voice control channel 32, and the voice channel 31 and the voice control channel 32 are set to SVC or PVC according to a general connection establishment method such as ATM UNI or Q.2931.

In the Voice Telephony Protocol Over ATM (VTPOA) as shown in FIGS. 3 and 4, the telephone service processing is facilitated in the telephone terminal apparatus having the computing processing capability by performing the telephone terminal apparatus 10 verification procedure and the telephone number verification procedure. Make it possible. In addition, by transmitting the tone information generated from the telephone terminal to the switch device 20 one by one as shown in Figure 5 and Figure 6 maintains the usage of the telephone service, such as call forwarding, three-way call, conference call, etc. provided in the general private switching network.

The format of the message exchanged in the call setup procedure performed by the same process as in FIGS. 3 and 5 is shown in FIG. 7, and these messages are communicated through the voice control channel 32. Referring to FIG. 7, a common part (CP) is a part commonly included in the front part of each message, and only some content may be filled according to the type of message. The protocol discriminator of the common part CP is information for distinguishing protocols, and all messages of FIG. 8 have the same code value. The voice channel ID is a part for recording the ID value of the corresponding voice channel when the content of the message is associated with a specific voice channel. The common ID is a part for recording the number of each message. Is shown. The call reference is for distinguishing one complete call from the oscillator to the called party, and such a call is represented through a call state. When a call arrives at the switch device 20, a call reference is given. The message length indicates the effective message length following the common part CP in each message. In FIG. 7, the message formats of reference numerals 100-206 are the same as the message formats of FIGS. 3 and 5.

First, referring to Figures 3 and 4 looks at the process of the telephone service by connecting the incoming call to the telephone apparatus 20 to the telephone terminal device 10. The incoming call to the switch device 20 is a call originating from a telephone terminal device connected to the same switch device 20 or a telephone input through a public telephone network. The processor in charge of the connection setting of the telephone in the switch device 20 is a telephony processor. When the call is received, the telephony processor gives a call reference in step 311 and detects the telephone number of the destination. In the switch device 20, a telephone number, an ATM address, a voice control channel ID, a voice channel ID, and the like are provided in a link table so that the telephony processor can set up a connection using a destination phone number as shown in FIG. Find the address. In FIG. 8, the voice control channel ID item is dynamically generated and destroyed.

The telephony processor, which finds the destination ATM address to which to connect using the destination telephone number, checks whether a voice control channel exists using the table of FIG. 7 in step 313. If the voice control channel exists, the message 100 (Device_Ready) as shown in FIG. 3 is transmitted to the telephone terminal device 10 through the voice control channel. If the voice control channel does not exist in the linked table, the telephony processor sets a voice control channel to the destination ATM address through ATM UNI or Q.2931 in step 315 and transmits a message 100 (Device_Ready). At this time, the type and format of the message are as shown in FIG. In the message 100 (Device-Ready), the service ID indicates the type of service and uses a code that has already been contracted. For example, if the service ID is 1, it means that the telephone or a device capable of performing its function must be prepared since it is a telephone service. In addition, the message 100 (Device-Ready) has a telephone number entry, the telephone terminal device 10 may check the telephone number and determine whether to receive it. In step 317, the telephony processor checks whether the voice control channel is successfully connected, and if the voice control channel is successfully connected, the telephony processor transmits the message 100 (Device_Ready) to the telephone terminal device 10.

The processor of the telephone terminal device 10 receiving the message 100 (Device-Ready) checks the service ID and the telephone number, and outputs a message 101 (Res_Ready) in response to the service result according to the confirmation result. In the case of the telephone terminal device 10 having two or more telephone numbers, if the telephone service is to be provided through a phone number different from the telephone number received through the message 100 (Device-Ready), the message is changed to the message 101 (Res_Ready). Enter the phone number you want to use. The return value of the message 101 (Res-Ready) indicates a value of 0 when the service is acceptable, and a non-probable cause code value promised above.

The telephony processor 20 of the switch device 20 that has received the message 101 (Res-Ready) analyzes the message 101 (Res_Ready) received through the VCC in step 319, and the switch device 20 when the return value indicates a serviceability. The telephony processor in step 321 establishes a voice channel through which voice data can be transmitted. In this case, if the voice channel is already set by searching the table of FIG. 8, the set voice channel may be used. If the voice channel is successfully established, the voice channel ID is linked with the table of FIG. 8 and registered together with the VPI / VCI value of the voice channel.

When the setting of the voice channel is completed, the switch device 20 fills in the message 102 (Call_Request) with the voice channel ID, the VPI / VCI value, the service ID, and the destination telephone number and transmits the message to the phone terminal device 10. Then, the telephone terminal device 10 records a voice channel ID, a VPI / VCI value, and outputs a signal indicating that a call has been made to the device corresponding to the telephone number. For example, when an analog phone is connected, it puts an AC ring voltage and outputs an event to the application processor when the phone application is running on the PC. When the above process ends, the telephone terminal apparatus 10 responds by sending a message 103 (Rsp_Request) to the switch apparatus 20, and the current state of the telephone terminal apparatus 10 is recorded in the response message. For example, if the phone is ringing, the status of the terminal device appears as ringing.

On the other hand, the telephony processor of the switch device 20 performs steps 323 to 325 to notify the phone terminal device of the incoming call and waits for the phone terminal device to be connected. That is, the telephony processor transmits the message 102 (Call_Request) and starts the timer, and waits for the message 103 (Res_Request) to be received before the timer expires. In this case, the telephony processor may check the state of the telephone terminal device 10 by burning a message 109 (Query_State) if necessary. At this time, when the state of the telephone terminal device 10 transitions to the hook-off state, the telephone terminal device 10 sends a message 105 (Call_Connected) to inform that the call is connected. At this time, the voice channel ID of the corresponding telephone number should be recorded in the message 105 (Call_Connected). The telephony processor of the switch device 20 receiving the message 105 (Call_Connected) connects the received telephone voice stream to the virtual channel of the voice channel ID, and transmits the message 106 (Conn_Complete) to the telephone terminal device 10 to completely set up the telephone call. It tells you that

Thereafter, the switch device 20 performs steps 327 and 329 and after the message 106 (Conn_Complete) is generated, all voice data is transmitted to the telephone terminal device 10 through the voice channel. However, if a flash, DTMF tone or the like occurs in the telephone device even during a conversation, these control signals are immediately transmitted to the telephony processor of the switch device 20 through the voice control channel. When the telephony processor does not request the signal, the telephony processor transmits such a signal to the sender, and performs the corresponding signal flame.

When the call is terminated while performing the call function as described above, the hook-on function is performed to perform the cutting operation. The call termination procedure shown in FIG. 3 is an example of ending a call by hooking on the telephone terminal device 10. When the call is disconnected, the telephone terminal device 10 generates a message 107 (Disconnected) and transmits it to the switch device 20. In response, the switch device 20 transmits a message 108 (Res_Disconnected) to the telephone terminal device 10. That is, when the call is disconnected, a message 107 (Disconnected) is immediately transmitted to the switch device 20. The message determines the reason for the disconnection and the mode of disabling the voice channel after the call is disconnected. This is recorded. If the voice channel is not released, the voice channel can be used again later.

5 and 6 illustrate an outgoing call procedure for making a call to the switch device 20 in the telephone terminal device 10. As shown in FIG. Here, the telephone terminal device 10 includes an application of a PC that can set up a telephone call in addition to the telephone.

For the outgoing call, the telephone terminal device 10 should check whether the switch device 20 can support the telephone service in the hook-off state in step 412. To this end, the telephone terminal device 10 transmits a message 200 (Switch_Ready) in step 414, and the service ID indicating the type of service and the telephone number of the telephone terminal device 10 are recorded in the message 200 (Switch_Ready). Then, the telephony processor of the switch device 20 receiving the message 200 (Switch_Ready) determines whether to allow the telephone service to the corresponding telephone number, and then sends a message 201 (Res_Ready) to the telephone terminal device 10 to respond. At this time, whether or not the telephone service can be provided is recorded in the message 201 (Res_Ready) as a return value. At this time, if the return value is 0, telephone service is available, and a non-zero number indicates an error code value.

Upon receiving the message 201 (Rsp_Ready), the telephone terminal device 10 sets up a voice channel for transmitting signaling information. In this case, if the voice channel is already set in step 416, it is detected and not newly set. However, if the voice channel is not set, it is newly set. If the voice channel is successfully connected, it is detected in step 418. If the voice channel is successfully established as described above, the telephone terminal device 10 sends a message 202 (Vchannel_Setup) to the switch device 20 to inform the voice channel of the information. Then, the switch device 20 manages the call by adding the voice channel ID, the VPI / VCI value and the telephone number to the link table as shown in FIG.

The switch device 10 generates a message 203 (Rsp_Setup) as a response message to the message 202 (Vchannel_Setup) and transmits the message to the telephone terminal device 10. At this time, upon receiving the message 203 (Rsp_Setup), the telephone terminal device 10 generates a dial tone in step 420 to inform that it is connected to the switch device 20 and can receive a destination telephone number. Thereafter, when the DTMF tone signal is input in step 422, the telephone terminal device 10 converts the DTMF tone signal into digital data and generates a message 204 (Digit_Transmit) and transmits the message to the switch device 20. In the message 204 (Digit_Transmit), two bytes after the CP indicate the number of valid numbers, and each number is carried in two bytes. The response message of the switch device 20 to the message 204 (Digit_Transmit) becomes the message 205 (Rsp_Receive).

By repeating the above operation, the telephone terminal device 10 converts the DTMF tone signal into digital data and transmits it to the switch device 20. The switch device 20 collects incoming digital data immediately upon arrival and becomes a meaningful telephone number. Start call setup at the destination. Whenever the state is changed in the process of setting up a call, the destination is reported to the source. For example, if the other party's telephone ring is ringing, the status is transmitted to the telephone terminal device 10 through message 206 (State_Report).

In this case, the telephone terminal device 10 transmits DTMF information in step 422 and then waits for a signal received from the switch device 20 in step 424. When the message 206 (state_Report) is received, the telephone terminal device 10 generates a ring back tone in step 426 and waits for reception of a connection signal from the switch device 20.

At this time, when the called party picks up the telephone receiver, the switch device 20 generates a message 105 (Call connected) and transmits the message to the telephone terminal device 10. The telephone terminal device 10 sends a message 106 (Conn_Complete) in step 428. In response, the terminal detects the connection, and performs steps 430 and 432 to finish setting up the phone call and service the phone call.

When the telephone call is terminated in the state of serving the telephone call as described above, the process of releasing the voice channel is performed in the same process as described with reference to FIGS.

As described above, two virtual channels such as a voice channel and a voice channel are created and used for a telephone service in an ATM network, so that signals for call setup and flash, tone, etc. during a call are not mixed with PCM voice data. Therefore, there is no need for equipment for generating, separating and detecting signal information in a telephone terminal device for a telephone application program such as an ATM switch device and a PC. In addition, since a signal is transmitted to the switching equipment separately from the voice stream channel, various services can be easily implemented in a device such as an ATM private switching network.

In addition, the present invention separates the pure voice channel and the voice control channel, thereby facilitating the coupling with a computer, thereby facilitating the processing of telephone information in a PC. Since a plurality of voice channels are made in one voice control channel, multiple phone calls can be made simultaneously with the same phone number.

As described in the telephone call setup protocol, by first negotiating a telephone service, a device such as a voice recorder or a voice application can receive a telephone service even if the telephone service is not necessarily a telephone. Because of the combination of computer and telephone, it can be effectively applied to building a multi-service complex system.

Claims (3)

In a voice service apparatus of a private AT switch network, Telephone terminal apparatuses having an ATM interface unit for performing an ATM matching function with the telephone, and having a telephone function; Phone number, AMT address, voice control channel ID, voice channel ID, etc. is provided with a link table, and a switch device connected to the public network, When the voice data in the AT format is transmitted and received between the telephone terminal device and the switch device, a voice channel for transmitting and receiving pure voice data and a voice control channel for transmitting and receiving signaling data for controlling the voice channel are independently configured. A voice service device of a private AT network. Telephone devices and a switch device connected to the public network, wherein the telephone devices and the switch device transmit signaling data through a voice control channel and transmit voice data through a voice channel. In the voice call service method of the switching network, Determining an ATM destination address using an incoming telephone number when an incoming call is generated, and then connecting the voice control channel; Establishing a voice channel for transmitting a voice stream after confirming the phone terminal device and a phone number through the connected voice control channel; The voice call service method of the private ATM switching network, characterized in that the process of the telephone terminal device hooking off the connection between the telephone devices to the telephone communication service. Telephone devices and a switch device connected to the public network, wherein the telephone devices and the switch device transmit signaling data through a voice control channel and transmit voice data through a voice channel. In the voice call service method of the switching network, Checking whether telephone service is supported by the switch device when an outgoing signal is generated; Connecting a voice control channel and supplying a dial tone to a subscriber when the telephone service is available; When the subscriber side receives the DFM tone signal, converts it into digital data and transmits it through the voice control channel and waits; And a method of connecting a subscriber and a voice channel to service a telephone call when receiving a connection message through the voice control channel in the waiting process.

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