KR101303380B1 - System and method for providing chatting service in public switched telephone network - Google Patents

Abstract

The present invention relates to a technology for providing a chat service with a user, such as a telephone, a web, a messenger, or the like, using a wired telephone terminal in a wired telephone network (PSTN) for providing a voice call path.

To this end, the present invention is a system for transmitting and receiving a chat message using a wired telephone network, as the calling terminal requesting a chat service dials a number of a wired short message service center (ISMC), the calling terminal and a wired short message service. An exchange for connecting a voice call path between centers (ISMC); In the state of maintaining the voice call path, the defined message is exchanged with the calling terminal by the FSK signaling method, and the calling terminal designated by the calling terminal is called to perform a chat synchronization control between the calling terminal and the called terminal to perform the calling. And a wired short message service center (ISMC) for mediating a chat message exchange between a terminal and the called terminal.

Description

System and method for providing chat service in wired telephone network {SYSTEM AND METHOD FOR PROVIDING CHATTING SERVICE IN PUBLIC SWITCHED TELEPHONE NETWORK}

1 is an overall configuration of a chat service providing system in a wired telephone network according to the present invention.

2 is a block diagram of a chat service protocol stack according to the present invention;

3 is a block diagram of a message data frame according to the present invention;

4 is a message flow chart illustrating a chat request procedure of a calling terminal for providing a chat service in a wired telephone network according to the present invention.

5 is a block diagram of a chat request message (RCM) according to the present invention.

6 is a chat request timing diagram of a calling terminal for providing a chat service in a wired telephone network according to the present invention;

7 is a message flow chart illustrating a chat request procedure to a called terminal for providing a chat service in a wired telephone network according to the present invention.

8 is a message flow chart illustrating a chat response procedure of a called terminal for providing a chat service in a wired telephone network according to the present invention.

9 is a block diagram of a chat response message (ACM) according to the present invention.

10 is a chat response timing diagram of a called terminal for providing a chat service in a wired telephone network according to the present invention.

11 is a message flow chart for explaining a chat service providing procedure in a wired telephone network according to the present invention.

12 is a block diagram of a chat data message (CDM) in accordance with the present invention.

13 is a block diagram of a chat transmission message (CSM) according to the present invention.

14 is a timing diagram of a chat transmission message in accordance with the present invention.

15 is a terminal grant signal (CPS) and terminal non-response signal (CRS) timing diagram according to the present invention.

16 is a timing diagram of a chat data message (CDM) in accordance with the present invention.

17 is a timing diagram of a short data message (SDM) in accordance with the present invention.

The present invention relates to a system and method for providing a chat service in a wireline telephone network. It relates to a technology for providing a chat service.

Currently, a friend list is registered for users who have installed the same messenger program on the Internet, and text, voice, and video communication between users connected to the network if the user belonging to the friend list is online Various messenger services are provided to make this possible.

When a user inputs a text through a keyboard between the user terminals registered in the friend list, the text may be outputted to his terminal and the other terminal, and a chat service may be used to communicate with each other using text. Currently, such a chat service is provided through a wired internet network or a wireless internet network, and communicates based on IM (Instant Message) protocol for real time data communication.

On the other hand, the operation principle of the instant messenger program including the chat service is to check the IP address of friends registered in the user's list and check the online status from time to time, and secure a foundation to operate various services provided through this. Messages can be delivered in three ways: network, peer-to-peer (P2P), or a combination of both.

Therefore, in order to use the chat service, the instant messenger program must be downloaded and installed in the corresponding terminal. That is, in the case of a wired Internet network, a corresponding messenger program must be downloaded and installed in a computer. In the case of a wireless Internet network, a messenger program must be downloaded and installed in a mobile terminal (eg, a mobile phone or a PDA). When two terminals using the same messenger program are connected to a wired or wireless Internet network and the chat function is activated on the messenger program, each terminal exchanges chat messages with each other based on an IM protocol.

Meanwhile, the wired internet network or the wireless internet network is a different network from the wired telephone network (PSTN). A terminal (eg, a wired telephone terminal, a fax terminal, etc.) connected to a wired telephone network (PSTN) connects or disconnects a voice call path while exchanging analog signals with a local exchange configured in the wired telephone network (PSTN).

In this way, since the local exchange (LE) and the telephone terminal (CPE) configured in the wired telephone network (PSTN) do not support the instant messaging (IM) protocol, the telephone terminal connected to the wired telephone network is another telephone connected to the wired telephone network. It is not possible to send and receive chat messages with a terminal or other terminal connected to a wired or wireless Internet network.

The present invention was created in view of the above circumstances, and an object of the present invention is to propose a protocol for providing a chat service with another telephone terminal or web terminal using a telephone terminal in a wired telephone network providing a voice call path. And to provide a chat service in a wired telephone network based on the protocol.

In order to achieve the above object, a chat service providing system in a wired telephone network according to the present invention, in a system for transmitting and receiving a chat message using a wired telephone network, the calling terminal requesting a chat service is a wired short message service center ( An exchanger for connecting a voice call path between the calling terminal and a wired short message service center (ISMC) by dialing a number of an ISMC; In the state of maintaining the voice call path, the defined terminal and the defined message are exchanged with the FSK signaling method, and the calling terminal designated by the calling terminal is called to perform chat synchronization control between the calling terminal and the called terminal. And a wired short message service center (ISMC) for mediating a chat message exchange between an originating terminal and the called terminal.

In order to achieve the above object, in the method of providing a chat service in a wired telephone network according to the present invention, in a method of transmitting and receiving a chat message using a wired telephone network, (a) the calling terminal requesting a chat service is a wired short message; Connecting a calling voice call path between the calling terminal and the wired short message service center (ISMC) by dialing a number of a service center (ISMC); (b) performing a chat request procedure with the calling terminal through the calling voice channel; (c) the wired short message service center (ISMC) calls the called terminal designated by the calling terminal to connect to the called voice channel and transmits a short data message (SDM) informing the called terminal of the chat request. Disconnecting the called voice channel; (d) when the called side voice call path between the called terminal and the wired short message service center (ISMC) is reconnected as the called terminal dials a number of the wired short message service center (ISMC), the called party voice call is reconnected. Performing a chat response procedure with the called terminal through a path; (e) performing a chat synchronization control between the calling terminal and the called terminal to mediate a chat message exchange between the calling terminal and the called terminal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of a chat service providing system in a wired telephone network according to the present invention.

Public Switched Telephone Network (PSTN), which is a network for voice calls, includes a local switch 11 and a plurality of local switch 11 for providing a voice call path for the wired telephone terminals 1 and 2. Is connected to the Toll exchanger 12 to perform a switching operation for each local exchange 11, a plurality of Toll exchangers 12 are connected to the E1 line, the wired telephone terminal (hereinafter referred to as the terminal) and the voice call is connected Wired Short Message Service Center (ISMC: Interactive Short Message Service Center) for exchanging chat messages with the terminals 1 and 2 to enable chatting between the terminals 1 and 2 or between the terminals 1 and 2 and the web terminal. Gateway) is provided with a local 14, and ISMC gateway (G / W) to enable the ISMC local 14 to work with equipment located in other communication networks.

The ISMC local 14 connected to the Toll exchanger 12 via the E1 line exchanges signals with the Toll exchanger 12 using No.7 signaling or R2 signaling.

Meanwhile, the ISMC G / W 13 includes a MIDC 40 that provides a text message transmission service for a mobile terminal accommodated in the mobile communication network 50, and a chat server that provides a chat service for a web terminal accommodated on the web ( 20) and the ICIS 15 for inputting information on the chat service request customer and providing the information to the ISMC local 14 and performing a function such as billing may be connected.

Although the ISMC local 14 and ISMC G / W 13 shown in FIG. 1 are functionally divided, they may be configured as a single wired short message service center (ISMC).

2 is a diagram illustrating a protocol stack mounted on a terminal 1 and an ISMC local 14 according to the present invention.

The terminal 1 and the ISMC local 14 each have a physical layer, a data link layer, and a transport layer.

The transport layers 1c and 14c define various messages and parameters for transmitting / receiving messenger / chat messages, and the data link layers 1b and 14b define a mark signal for reliable transmission and reception between the terminal 1 and the ISMC local 14. , Checksum, and the like, and the physical layers 1a and 14a define a 1200 FSK modulation scheme. The FSK signal specification of the physical layers 1a and 14a is in accordance with the "Technical Standards for Data Transmission Interfaces in PSTN Subscriber Lines for Displaying Caller Information" (TTAS. KO-01.0014) established by the TTA standard. Table 1 shows the FSK signal specification.

Modulation method Continuous-phase binary frequency-shift-keying Mark (logical 1) 1200 ± 12㎐ Space (logical 0) 2200 ± 22 ㎐ Signal level -13.5 dbm ± 1.5㏈ (termination resistance: 600Ω) Transmission signal characteristic The total power of the external signal in the voice band, including nonlinear or quantized noise, shall be at least 30 kHz below the frequency of each transmitted signal (termination resistance: 600 kHz). Source impedance 600Ω Transmission rate 1200 ± 12 baud Application of the data Serial, Binary, Asychoronous

In the present invention, the physical layer (1a, 14a) is a terminal CPE Alerting Signal (CAS), a CPE Acknowledgment Signal (ACK: DTMF D), FSK Signal, CPE (CPE Permission Signal: DTMF) A), the terminal non-response signal (CRS; CPE not twitter Signal: DTMF B) is defined.

In the data link layers 1b and 14b, the message frame is completed by attaching a mark signal to the message completed in the transport layer and adding a checksum.

3 is a block diagram of the message frame.

The purpose of the mark signal of the message frame is to prepare the receiving side to receive the message frame and to create a suitable environment, and the purpose of the checksum is to detect an error on the received data. In addition, the message frame has a multiple data message format (MDMF) in which several parameters are included in one message.

Looking at the message frame, the message header (MH) is composed of a message type word (MT) defining the message type to be transmitted and a message length word (ML) defining the total message length, the message body (MB) is a number of It is defined as parameters P1, P2, ..., Pn, which consists of a parameter type word PT, a parameter length word PL and a parameter data word PB.

Here, the message length word ML constituting the message header MH is a binary form of the length of the body MB in the message, and the length of each message is a parameter type word PT and a parameter length word PL. , Equal to the total sum of the parameter data words (PB). The parameter length word PL of each parameter represents the sum of the parameter data word PB of the corresponding parameter in binary form. Since the parameter length is at least 1, the parameter of the optional part without contents is excluded from the transmission.

In the present invention, the terminal 1 is connected to the local exchange 11 via a PSTN or ISDN line in the subscriber's home to transmit and receive message frames in the FSK signaling mode in the voice band, the ISMC local 14 and the TOLL switch 12 It is connected with No.2 or R2 signaling and transmits and receives message frames in FSK signaling in the voice band.

Next, a method of providing a chat service in a wired telephone network according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

A chat request procedure of a calling terminal for providing a chat service in a wired telephone network according to an embodiment of the present invention will be described with reference to the message flowchart shown in FIG. 4.

In order to request a chat service from the calling terminal 1, the ISMC local 14 needs to be connected. For this purpose, the calling terminal 1 dials the number of the ISMC local 14 in the same way as a general voice call. ).

That is, when the originating terminal 1 dials the telephone number of the ISMC terminal 14 (S2), the originating local exchange 11 accommodating the originating terminal 1 is configured according to the translation result of the dialing telephone number. 14) and transmits the call setup message (S4) and transmits the ringback tone to the calling terminal (1) (S6).

When the Connect message is transmitted from the IMSC local 14 receiving the Call Setup message (S8), the voice call path is connected between the calling terminal 1 and the ISMC local 14 (S10).

When the voice call path is connected, the ISMC local 14 transmits a CPE Alerting Signal (CAS) to the originating terminal 1 (S12), and receives a terminal response signal (ACK) from the originating terminal 1 receiving the same. Is transmitted (S14), the ISMC local 14 transmits a terminal acknowledgment message (CAM; CPE Alerting Message) indicating the reception standby state to the originating terminal (1) (S16).

 If a terminal response message (ACK-C) including the message type information to be transmitted from the originating terminal 1 receiving the terminal acknowledgment message (CAM) is transmitted (S18), the ISMC local 14 receives the message type information. A terminal acknowledgment message (CAM) is transmitted to the calling terminal 1 (S20).

After the calling terminal 1 transmits a chat request message (RCM) (S22), it becomes a chat maintaining state, and at this time, it is preferable that the state indicating that it is connecting with the chat counterpart via the calling terminal 1 is displayed (S24). ).

On the other hand, while waiting for a connection with the chat partner, ISMC local 14 regularly transmits a transmission permission signal (CPS: CPE Permission Signal: DTMF A) to the calling terminal 1, and the calling terminal 1 permits the sending. The CPE response signal (DTME B) is transmitted to the ISMC local 14 within the prescribed time after receiving the signal CPS to maintain the channel connection state.

Each message mentioned in FIG. 4 will be described in more detail.

The terminal acknowledgment message CAM transmitted to the calling terminal 1 in step S16 includes a service start parameter (Mandatoty Parameter) as shown in [Table 2]. In step S16, Receive Ready "0x06" is coded in the service start parameter of the transmitted terminal acknowledgment message (CAM) and transmitted to the calling terminal 1, and in step S20, the RCM Receive Ready indicating that the chat message is ready to be received in the service start parameter. A terminal acknowledgment message (CAM) coded with "0x07" is transmitted to the originating terminal 1.

Service start parameters 7 6 5 4 3 2 One 0 One 0000 0010 (0x02): Service start parameter type 2 0000 0001 (0x01): Parameter length (1 byte) 3 0000 0001 (0x01): SMS Send
0000 0010 (0x02): E-Mail Send
0000 0011 (0x03): SSM Receive Ready
0000 0100 (0x04): ESM Receive Ready
0000 0101 (0x05): FSM Receive Ready
0000 0110 (0x06): Receive Ready
0000 0111 (0x07): RCM Receive Ready
0000 1000 (0x08): ACM Receive Ready

The terminal response message (ACK-C) transmitted to the ISMC 14 in step S18 includes a terminal response parameter (CPE ACK Parameter) and a version parameter as shown in [Table 3].

Terminal response parameter 7 6 5 4 3 2 One 0 One 0000 0011 (0x03): Terminal response parameter type 2 0000 0001 (0x01): Parameter length (1 byte) 3 0000 0001 (0x01): SMS ACK
0000 0010 (0x02): E-Mail ACK
0000 0011 (0x03): SMS Send
0000 0100 (0x04): E-mail Send
0000 0101 (0x05): FAX Send
0000 0110 (0x06): NACK
0000 0111 (0x07): RCM Send
0000 1000 (0x08): ACM Send

In the terminal response parameter, the RCM Send "0x07" is coded in the terminal response parameter when a Request Chatting Message (RCM) is to be transmitted, and the ACM Send "0x08" receives an Accept Chatting Message (ACM). In case of transmission, it is coded in the terminal response parameter.

The version parameter indicates the version of the short message protocol supported by the calling terminal 1. The short message protocol version has the format "XX.XX" and the parameter contains only numbers except ".", And the version parameter is 4 bytes long. Each byte has an ASCII code value, and the terminal supporting only the existing SMS protocol has a value of the first byte of the version parameter ranging from 0 to 4, and the chatting support terminal has a value of 5 to 9.

Chat request message (RCM) transmitted to ISMC local 14 in step S22 is a message type word (MT), message length word (ML), as shown in FIG. It consists of called number parameter and short message parameter.

Message types defined in connection with the chat service in the present invention are shown in [Table 4].

Message Type Message name Code (Hexadecimal) Code (binary) Transmission direction Chat request message
(Request Chatting Message: RCM) 0Xx9 xxxx 1001 Terminal-> ISMC Local Chat response message
(Accept Chatting Message: ACM) 0xXA xxxx 1010 Terminal-> ISMC Local Chat data messages
(Chatting Data Message: CDM) 0xXB xxxx 1011 ISMC Local-> Terminal Chat outgoing message
(Chatting Send Message: CSM) 0xXC xxxx 1100 Terminal-> ISMC Local

The most significant bit (MSB) of the message type is the connection bit. When this connection bit is "1", it indicates that there is a next message to be connected. The next three bits are used in message order and coded with numbers 1 through 7. The four bits following the code described in Table 7 are coded to indicate the message type.

Called party number parameters are shown in [Table 5].

The called number parameter in the chat request message (RCM) is an essential parameter, and the short message parameter is an optional parameter. In the chat request message (RCM), both numbers and letters are supported to support a phone number and a web ID for designating a chat partner. When the short message parameter is used in the chat request message (RCM), it should not exceed 80 bytes at the destination terminal.

Called party number parameter 7 6 5 4 3 2 One 0 One 0000 1100 (0x0C): Receive Number Parameter Type 2 00 ?? ???? (0x0?): Parameter length ( 25 bytes ) 3 Character 1 4 Character 2 Y + 2 Letter Y

4 is a timing diagram according to the protocol procedure between the originating terminal 1 and the ISMC local 14 after the voice call path is connected as shown in FIG.

6 is a timing diagram of a chat connection request from the originating terminal 1 to the ISMC local 14.

Timing values for each signal or message are shown in [Table 6].

Chat Connection Request Timing Values sign value meaning T1 50 ~ 5000ms Time until ISMC Local sends CAS after acknowledging off-hook of originating terminal T2 Ms80ms Length of CAS sent by ISMC Local T3 ~ 100 ms Time until the calling terminal transmits the ACK signal after acknowledging the CAS T4 ≒ 60 ms Length of ACK signal transmitted by calling terminal T5 ~ 100 ms The time before ISMC Local acknowledges the ACK signal sent by the calling terminal and sends a terminal identification message (CAM) T6 ≒ 117 ms Length of CAM sent by ISMC Local. T7 ~ 200 ms Time before the calling terminal transmits ACK-C after receiving CAM T8 167 ms Length of ACK-C transmitted by calling terminal T9 ~ 200 ms Time before ISMC Local sends CAM after receiving ACK-C T10 ≒ 117 ms Length of CAM sent by ISMC Local. T11 ~ 400 ms The time after the calling terminal receives the CAM and before sending the RCM T12 variable The length of the RCM sent by the calling terminal

The length of each signal or message is the time including the mark signal (80 bits).

If each signal or message is not received even after the prescribed time, retransmission, retransmission request, call disconnection, etc. should be performed according to the protocol proposed by the present invention.

On the other hand, ISMC local 14 receiving the chat request message (RCM) from the originating terminal 1 through the process of Figure 4 analyzes the called number parameters included in the chat request message (RCM) and the destination terminal (2) and A short data message (SDM) for notifying a chat request is transmitted to the called terminal 2 while the voice call path is connected.

A process of requesting a chat from the ISMC local 14 applied in the method of providing a chat service in a wireline telephone network according to the present invention to a called terminal, which is a chat counterpart, will be described with reference to the message flowchart shown in FIG. 7.

The ISMC local 14 requests a call connection to the terminating terminal 2 to the local exchange 11 based on the terminating number analyzed from the terminating number parameter (S30), and the local exchange 11 receives the terminating terminal 2. The ring signal is outputted to the called terminal 2 (S32).

The called terminal 2 receiving the ring signal recognizes that the call is a call transmitted from the ISMC local 14 based on the calling number of the corresponding call and automatically transitions to the hook-off state (S34). As it is hooked off, the local exchange 11 transmits a connection complete message (Connect) to the ISMC terminal 14 (S36).

Thus, the voice call path between the called terminal 2 and the ISMC local 14 is connected.

After the voice call path is connected, the ISMC local 14 transmits a CPE Alerting Signal (CAS) to the called terminal 2 (S40), and receives a terminal response signal (ACK) from the called terminal 2 which received it. Is transmitted (S42), the ISMC local 14 transmits a terminal acknowledgment message (CAM) to the destination terminal 2 indicating that it will transmit a short message message (SDM: SMS Data Message) (S44).

When the terminal response message (ACK-C) is transmitted from the called terminal 2 that has received the terminal acknowledgment message (CAM) (S46), the ISMC local 14 sends a terminal data message (SDM: SMS Data Message) to the called terminal ( 2) (S48). The terminal data message (SDM) is composed of a short message, a time message, a receiver parameter, a password parameter, a reply number parameter, and an SMS message parameter. The terminal data The message (SDM) is used as a chat request message using the beginning of a short message parameter. In addition, a chat requester number is transmitted to the reply number parameter. When a chat request is received from the web or the like, there is no reply number parameter and the requester ID is displayed in the header. #CH (up to 8 digit ISMC access number): 1 digit pop-up time (1 to 9, unit minute) even if a separate ISMC local 14 access number is required or if the pop-up time of the terminal is specified in ISMC local 14 Use up to 40-byte headers in the form of: (maximum 25-digit ID if the chat requester is a web / messenger user).

Preferably, the destination terminal 2 that supports the chat function corresponding to the present invention outputs a chat request message notification screen notifying that a chat request is made through a display screen when the SDM is received. The user of the called terminal 2 may perform a response to the chat request through input of an "OK key" or "confirmation key" based on the bar displayed on the chat request message notification screen.

On the other hand, the ISMC local 14 that transmits the short data message SDM receives the FSK data response message ACK-F from the called terminal 2 (S50), and terminates the message (DCM) to the called terminal 2. Transmit (S52), and transition to the release state (S54).

As a result, the voice call path between the ISMC 14 and the called terminal 2 is disconnected (S56).

A termination information parameter may be coded in the termination message DCM to specify a termination reason. End information parameters are shown in [Table 7].

Exit Information Parameter 7 6 5 4 3 2 One 0 One 0001 0011 (0x13): Termination information parameter type 2 0000 0001 (0x01): Parameter length (1 byte) 3 0000 0001 (0x01): Not ANN subscriber
Any other value: reserved

In the state that the chat request message notification screen is output to the called terminal 2 through the process described with reference to FIG. If so, the called terminal 2 attempts to connect to the ISMC local 14.

8 is a message flow chart illustrating a chat response procedure of a called terminal for providing a chat service in a wired telephone network according to an embodiment of the present invention.

When the user of the called terminal 2 inputs the "OK" or "OK", the called terminal 2 dials the chat response number and attempts to connect to the ISMC local 14 (S60).

The local exchange 11 transmits a call setup message to the ISMC local 14 based on the dialed called number (S62) and transmits a ringback tone to the called terminal 2 (S64).

When the ISMC local 14 transmits a Connect message in response to a Call Setup message (S66), a voice call path between the called terminal 2 and the ISMC terminal 14 is connected (S68).

When the voice call path between the called terminal 2 and the ISMC terminal 14 is connected, the ISMC 14 transmits a CPE Alerting Signal (CAS) to the called terminal 2 (S70). When the terminal response signal ACK is transmitted from the terminating terminal 2 (S72), the ISMC 14 transmits a terminal acknowledgment message CAM indicating the reception standby state to the terminating terminal 2 (S74).

When the terminal response message (ACK-C) including the message type information (0x08: ACM Send) to be transmitted is transmitted from the called terminal 2 receiving the terminal acknowledgment message (CAM) (S76), the ISMC local 14 Transmits a terminal acknowledgment message (CAM) including the message type information (0x08: ACM Receive Ready) to the called terminal 2 (S78).

The called terminal 1 transmits an ACM (Accept Chatting Message), which is a chat response message (S80), thereby entering a chat maintaining state (S82).

The ISMC local 14 regularly transmits a transmission permission signal (CPS: CPE Permission Signal: DTMF A) to the destination terminal 2 during the chat hold state, and the destination terminal 2 receives the transmission permission signal (CPS). After that, a no transmission signal (CRS: CPE Response Signal: DTME B) is transmitted to the ISMC local 14 within a prescribed time.

As shown in FIG. 9, the chat response message ACM is composed of a message type parameter, a message length parameter, and a called party number parameter. The called number parameter of the chat response message (ACM) is a reply number parameter value included in the short data message (SDM) received in step S48 of FIG. CH server number: Pop-up time: If the ID part exists in the header part of ID # in the header of ID #, the value of the ID part is used.

Called party number parameters are as shown in [Table 5].

8 is a timing diagram according to the protocol procedure between the ISMC local 14 and the called terminal 2 after the voice call path is connected.

10 is a timing diagram for a chat response message from the called terminal 2 to the ISMC local 14.

10 is a timing value for each signal or message shown in [Table 8].

Timing Values for Chat Response Messages sign value meaning T1 50 ~ 5000ms Time until ISMC local sends CAS after acknowledging off-hook of terminal T2 Ms80ms Length of CAS sent by ISMC Local T3 ~ 100 ms Time until UE transmits ACK after CAS recognition T4 ≒ 60 ms Length of ACK sent by UE T5 ~ 100 ms Time before ISMC Local acknowledges ACK sent by UE and sends CAM T6 ≒ 117 ms Length of CAM sent by ISMC Local. T7 ~ 200 ms Time before UE transmits ACK-C after receiving CAM T8 167 ms Length of ACK-C that UE transmits T9 ~ 200 ms Time before ISMC Local sends CAM after receiving ACK-C T10 ≒ 117 ms The length of the message whether the ISMC is transmitting or not (CAM). T11 ~ 400 ms Time before UE sends ACM after receiving CAM T12 variable Length of ACM

The length of each signal or message is the time including the mark signal (80 bits).

If each signal or message is not received even after the prescribed time, retransmission, retransmission request, call disconnection, etc. should be performed according to the protocol proposed by the present invention.

A chat service providing procedure in a wireline telephone network according to an embodiment of the present invention will be described with reference to the message flow chart shown in FIG.

When the originating terminal 1 enters the chat maintaining state with the ISMC local 14 (S24), and when the called terminal 2 enters the chat maintaining state with the ISMC local 14 (S82), the ISMC local 14 is the originating terminal. The chat data message (CDM: Chatting Data Message) is transmitted to (1) (S90), and the calling terminal 1 receives the chat data message from the ISMC local 14 so that the chat input window is output.

The chat data message CDM includes a time parameter, a short message parameter, and a known parameter as shown in FIG. 12.

The time parameter is an essential parameter, and the short message parameter and the announcement parameter are optional parameters. The short message parameter and the known parameter cannot be used simultaneously, and at least one must be coded.

The announcement parameter (Information Parameter) can be up to 200 bytes in the case of PSTN subscriber origin, the content of the parameter is coded to the ISMC local 14 to announce to the calling terminal (1) or the called terminal (2) during chat. , And the structure is shown in [Table 9].

Notice Parameters 7 6 5 4 3 2 One 0 One 0001 0010 (0x12): Notification message parameter type 2 ???? ???? (0x ??): Parameter length (maximum 200 bytes) 3 Character 1 4 Character 2 Y + 2 Letter Y

Subsequently, the ISMC local 14 transmits a terminal permission signal (CPS: CPE Permission Signal: DTMF A) to the calling terminal 1 (S92).

The requirements of the terminal permission signal (CPS) are shown in [Table 10].

Termination Permit Signal Requirements Nominal frequency 697 Hz, 1633 Hz Frequency tolerance ± 0.5% of nominal frequency Nominal frequency level -15 dBm / ton (termination resistance: 600 Hz) Level tolerance ± 1 dB per frequency duration 80 to 85 ms

When transmitting the terminal grant signal (CPS), the time difference between the two frequencies should be within 1 ms, and the period should be consistent with 80 to 85 ms.

After receiving the terminal permission signal CPS, the calling terminal 1 determines whether there is chat data input from the user (S94), and if it is input from the user and stored in a buffer (not shown) of the calling terminal 1. If the chat data exists (YES in S94), the chat sending message (CSM: Chatting Send Message) in which the chat data is stored is transmitted to the ISMC local 14.

The chat transmission message (CSM) is configured as shown in FIG.

The short message parameter in the chat transmission message (CSM) is an essential parameter and is shown in [Table 11].

Short message parameter Code (binary) Code (Hexadecimal) meaning One 0000 0101 05 Short message parameter type code 2 ???? ???? ?? Parameter length (up to 200 octets) 3
4
...
Y + 2 Character 1
Character 2
...
Letter Y

The ISMC local 14 transmits a chat data message (CDM: Chatting Data Message) corresponding to the chat transmission message (CSM) transmitted from the calling terminal 1 to the called terminal 2 (S98). The chat data message (CDM) transmitted in step S98 has a short message parameter (see FIG. 12). The called terminal 2 receiving the chat data message CDM outputs a character corresponding to the short message parameter on the display so that the user input of the calling terminal 1 can confirm the input.

If, as a result of the determination in step S94, if there is no chat data in the originating terminal 1 (No in S94), the originating terminal 1 is a terminal non-response signal to the ISMC local 14 (CRS: CPE not twitter Signal; DTMF B) is transmitted (S100). The requirements of the terminal non-response signal (CRS) are shown in [Table 12].

Terminal non-response signal requirement Nominal frequency 770 Hz, 1633 Hz Frequency tolerance ± 0.5% of nominal frequency Nominal frequency level -15 dBm / ton (termination resistance: 600 Hz) Level tolerance ± 1 dB per frequency duration 80 to 85 ms

When transmitting the terminal non-response signal (CRS), the time difference between the two frequencies should be within 1ms, the period should be consistent with 80 ~ 85ms.

The ISMC local 14 transmits the terminal permission signal CPS to the called terminal 2 after receiving the chat data message CDM or receiving the terminal non-responsive signal CRS from the calling terminal 1. The terminal 2 may transmit the content received from the user (S102).

The destination terminal 2, if the chat data exists according to whether or not the chat data input from the user is stored in the buffer (not shown) (Yes in S104), the short message parameter of the chat data transmission message (CSM) It transfers it to ISMC local 14 (S106).

The ISMC local 14 which receives the chat transmission message CSM from the called terminal 2 generates a chat data message CDM using the short message parameter of the chat transmission message CSM, and then the chat data message CSM. The CDM) is transmitted to the calling terminal 1, and the calling terminal 1 outputs a character corresponding to the short message parameter on the display so that the user input of the called terminal 2 can confirm the input.

If there is no chat data stored in the buffer of the called terminal 2 in step S104 (No in S104), the called terminal 2 transmits a terminal non-response signal (CRS) to the ISMC 14 (S110). .

After ISMC local 14 transmits a chat data message (CDM) to originating terminal 1 or when a terminal non-response signal (CRS) is transmitted from terminating terminal 2, ISMC local 14 transmits the originating terminal 1. By transmitting the terminal permission signal (CPS) to the originating terminal 1 to transmit the content received from the user (S112).

The ISMC local 14 continuously repeats the steps S90 to S112 described above while the calling terminal 1 and the called terminal 2 maintain the chat hold state. That is, the transmission permission signal CPS is alternately transmitted to the calling terminal 1 and the called terminal 2, and the chat sending message is sent from the calling terminal 1 or the called terminal 2 which has received the sending permission signal CPS. When the CSM is transmitted, it is converted into a chat data message and transmitted to the counterpart terminal, thereby enabling a chat message exchange between the calling terminal 1 and the called terminal 2.

The calling terminal 1 and the called terminal 2 transmit a chat transmission message (CSM) if the chat data is stored in the buffer while receiving the terminal permission signal (CPS) from the ISMC local 14. If the chat data is not stored, the terminal non-response signal (CRS) is transmitted.

The timing diagram for the chat transmission message (CSM) is shown in FIG. 14, and each timing value is shown in [Table 13].

Timing Values for Chat Outgoing Messages (CSM) sign value meaning T1 Ms80ms Length of CPS sent by ISMC Local T2 ~ 400 ms Time after the UE receives the CPS and before sending the CSM or CRS T3 variable The length of the CSM sent by the terminal

A timing diagram for the terminal non-response signal (CRS) is shown in FIG. 15, and each timing value is shown in [Table 14]. The interval between all two-way tones or messages during a chat must not exceed 1.5 seconds. That is, even when there is no data to be transmitted from the ISMC local 14 to the terminals 1 and 2, the periodic terminal permission signal (CPS) should be transmitted at 1.5 second intervals.

Timing value for terminal non-response signal (CRS) sign value meaning T1 Ms80ms Length of CPS sent by ISMC Local T2 ~ 400 ms Time after the UE receives the CPS and before sending the CSM or CRS T3 Ms80ms Length of CRS transmitted by UE

A timing diagram for the chat data message CDM is shown in FIG. 16, and each timing value is shown in [Table 15].

Timing Values for Chat Data Messages (CDM) sign value meaning T1 variable Length of CDM sent by ISMC Local T2 ~ 400 ms Time until the terminal transmits the FSK data response message (ACK-F) after receiving the chat data message (CDM) T3 variable Length of ACK-F message transmitted by UE

When the calling terminal 1 and the called terminal 2 perform a chat under the intermediation of the ISMC local 14 through the above-described process, when the calling terminal 1 or the called terminal 2 requests the end of the chat, the chat holding state is maintained. The voice call path between the ISMC local 14 and the originating terminal 1 and the ISMC local 14 and the called terminal 1 is disconnected while is released.

Referring to the message flow diagram shown in FIG. 11, the above-described chat end procedure will be described in detail.

When the originating terminal 1 ends the chat (S114), the local exchange 12 accommodated by the originating terminal 1 detects this and transmits a release signal to the ISMC local 14 (S16).

The ISMC local 14 receiving the release signal transmits a chat data message (CDM) in which chat data is stored to inform the terminating terminal 2 that the chat is terminated, and an FSK data response message to the chat data message (CDM). When (ACK-F) is transmitted from the called terminal 2 (S119) and transmits the termination message (DCM) to the called terminal (2) (S120).

The terminating terminal 2 receiving the termination message DCM disconnects the voice communication line connected with the ISMC local 14 and transitions to the idle state.

On the other hand, ISMC local 14 is a short message to the destination terminal 1 or the destination terminal 2 as the destination while the chat service between the calling terminal 1 and the called terminal 2 through the steps S90 to S112 When (Short Message Data) is received, the short message data message (SDM) for the received short message is transmitted to the calling terminal 1 or the called terminal 2 corresponding to the called destination.

ISMC local 14 transmits the short data message (SDM) before transmitting a terminal grant signal (CPS) to the calling terminal 1 or the called terminal 2 corresponding to the destination, and the short data message (SDM) After the transmission is completed, the terminal grant signal (CPS) is transmitted.

If the destination of the short data message SDM is the originating terminal 1, the ISMC local 14 transmits the short data message SDM to the originating terminal 1 while the terminal grant signal CPS is transmitted to the terminating terminal 2. ) And receives the chat data input by the user of the called terminal 2, and then transmits a chat data message (CDM) for the received chat data to the calling terminal (1).

A timing diagram for the short data message SDM is shown in FIG. 17, and each timing value is shown in [Table 16].

Timing Values for Short Message Data Messages (SDM) sign value meaning T1 variable Length of SDM sent by ISMC Local T2 ~ 400 ms Time until UE transmits FSK data response message (ACK-F) after receiving SDM T3 variable Length of ACK-F transmitted by UE

In addition, the ISMC local 14 does not receive a chat transmission message (CSM) or a terminal non-response signal (CRS) within a predetermined time after transmitting the terminal grant signal (CPS) to the calling terminal 1 or the called terminal 2. If not, the terminal permit signal (CPS) is transmitted for a preset maximum count, and in case of a CheckSum error for the chat transmission message (CSM) received from the calling terminal 1 or the called terminal 2, a retransmission request message ( After transmitting the RSM: Request Send Message for a predetermined number of times, if the chat data message CSM transmitted for the resend request message RSM is continuously CheckSum error, the RSM is sent to the calling terminal 1 and the called terminal 2. Send the end message (DCM) to disconnect the voice call.

In addition, if the ISMC local 14 fails to transmit the chat data message (CDM) to the calling terminal 1 or the called terminal 2, the chat data message (CDM) is transmitted for a preset number of times, and the chat data message If the transmission of the (CDM) fails continuously for a preset number of times, a termination message (DCM) is transmitted to the calling terminal 1 and the called terminal 2 to disconnect the voice call.

On the other hand, if the called terminal designated by the calling terminal 1 is a web terminal, the ISMC local 14 checks the connection state of the called terminal to the chat server 20 through the ISMC G / W 13, and the called terminal is If it is in the online state, it is possible to exchange chat messages between the calling terminal and the called terminal on the web by performing a chat synchronization control on the calling terminal 1. At this time, the ISMC local 14 periodically transmits a terminal grant signal (CPS) to the calling terminal 1, and if a chat transmission message (CSM) is received from the called terminal, sends a chat data message (SDM) to the calling terminal. Chat synchronization control is performed by transmitting.

Thus, the ISMC local 14 can provide a chat service between the originating terminal of the wired telephone network and the web terminal of the Internet network.

As described above, according to the system and method for providing a chat service in a wired telephone network according to the present invention, in a wired telephone network (PSTN) that provides a voice call path, a chat terminal is used between telephone terminals or between a telephone terminal and a web terminal. The service will be available.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (34)

An exchanger for connecting a voice call path between the calling terminal and the wired short message service center (ISMC) as the calling terminal requesting a chat service dials a number of the wired short message service center (ISMC); In the state of maintaining the voice call path, the defined message is exchanged with the calling terminal by the FSK signaling method, and the calling terminal designated by the calling terminal is called to perform a chat synchronization control between the calling terminal and the called terminal to perform the calling. Is provided with the wired short message service center (ISMC) for mediating the exchange of chat messages between the terminal and the called terminal, The wired short message service center (ISMC), If the called terminal is a wired telephone terminal accommodated in a wired telephone network, calling the called terminal to transmit a short data message (SDM) informing about a chat request while connecting a called voice channel and disconnecting the called voice channel. Chat service providing system in a wired telephone network, characterized in that. delete The method of claim 1, wherein the called terminal is When accepting a chat, dial the number of the wired short message service center (ISMC) to reconnect the wired short message service center (ISMC) and the called party's voice call path through the wired telephone network, and then the wired short message service center ( Sending and receiving a variety of chat messages according to the chat synchronization control of the ISMC) Chat service provision system in wired telephone network. The method of claim 1, wherein the defined message is A message type word (MT) defining the type of message to be transmitted, a message length word (ML) defining the total message length, and various parameters, The parameter is Assigned parameter type word (PT) according to the characteristics of the parameter content, A parameter length word (PL) indicating the length of the parameter content, and And a parameter data word (PB) defining the parameter content. Chat service provision system in wired telephone network. The method of claim 4, wherein the message type is characterized in that defined by the following [Table 4] Chat service provision system in wired telephone network. [Table 4] Message name Code (Hexadecimal) Code (binary) Transmission direction Chat request message
(Request Chatting Message: RCM) 0Xx9 xxxx 1001 Terminal-> ISMC Chat response message
(Accept Chatting Message: ACM) 0xXA xxxx 1010 Terminal-> ISMC Chat data messages
(Chatting Data Message: CDM) 0xXB xxxx 1011 ISMC-> Terminal Chat outgoing message
(Chatting Send Message: CSM) 0xXC xxxx 1100 Terminal-> ISMC The method of claim 4 wherein the parameter is As a service start parameter, it is defined by the following [Table 2] Chat service provision system in wired telephone network. [Table 2] 7 6 5 4 3 2 One 0 One 0000 0010 (0x02): Service start parameter type 2 0000 0001 (0x01): Parameter length (1 byte) 3 0000 0001 (0x01): SMS Send
0000 0010 (0x02): E-Mail Send
0000 0011 (0x03): SSM Receive Ready
0000 0100 (0x04): ESM Receive Ready
0000 0101 (0x05): FSM Receive Ready
0000 0110 (0x06): Receive Ready
0000 0111 (0x07): RCM Receive Ready
0000 1000 (0x08): ACM Receive Ready The method of claim 4 wherein the parameter is As a terminal response parameter, it is defined by [Table 3] Chat service provision system in wired telephone network. [Table 3] 7 6 5 4 3 2 One 0 One 0000 0011 (0x03): Terminal response parameter type 2 0000 0001 (0x01): Parameter length (1 byte) 3 0000 0001 (0x01): SMS ACK
0000 0010 (0x02): E-Mail ACK
0000 0011 (0x03): SMS Send
0000 0100 (0x04): E-mail Send
0000 0101 (0x05): FAX Send
0000 0110 (0x06): NACK
0000 0111 (0x07): RCM Send
0000 1000 (0x08): ACM Send The method of claim 4 wherein the parameter is Known parameters, characterized in that defined by the following [Table 9] Chat service provision system in wired telephone network. TABLE 9 7 6 5 4 3 2 One 0 One 0001 0010 (0x12): Notification message parameter type 2 ???? ???? (0x ??): Parameter length (maximum 200 bytes) 3 Character 1 4 Character 2 Y + 2 Letter Y 4. The wired short message service center (ISMC) of claim 3, wherein When the called terminal and the called side voice call path are reconnected while the calling terminal and the voice call path are connected, the first terminal transmits a first chat data message to the calling terminal and then permits the terminal to the calling terminal and the called terminal, respectively. Sending a signal (CPS) and the chat synchronization so that the calling terminal or the called terminal can send a chat transmission message (CSM) to the wired short message service center (ISMC) only when the terminal permission signal (CPS) has been received Characterized in that to perform Chat service provision system in wired telephone network. The method of claim 9, wherein the calling terminal is If there is no chat data to be transmitted in the state of receiving the terminal permission signal (CPS), the terminal non-response signal (CRS) is transmitted to the wired short message service center (ISMC). Transmitting the CSM to the wired short message service center (ISMC). Chat service provision system in wired telephone network. 12. The system of claim 10, wherein the wired short message service center (ISMC) comprises: And when the chat transmission message (CSM) is received from the calling terminal, transmitting a second chat data message (CDM) corresponding to the chat transmission message to the called terminal. Chat service provision system in wired telephone network. The method of claim 9, wherein the called terminal is If there is no chat data to be transmitted in the state of receiving the terminal permission signal (CPS), the terminal non-response signal (CRS) is transmitted to the wired short message service center (ISMC). Transmitting the CSM to the wired short message service center (ISMC). Chat service provision system in wired telephone network. 12. The system of claim 10, wherein the wired short message service center (ISMC) comprises: And when the chat transmission message (CSM) is received from the called terminal, transmitting a second chat data message (CDM) corresponding to the chat transmission message to the calling terminal. Chat service provision system in wired telephone network. The method according to any one of claims 9, 10, and 12, wherein the terminal grant signal (CPS) is a Dual Tone Multi-Frequency (DTMF) signal conforming to the requirements of Table 10 below. doing  Chat service provision system in wired telephone network. [Table 10] Nominal frequency 697 Hz, 1633 Hz Frequency tolerance ± 0.5% of nominal frequency Nominal frequency level -15 dBm / ton (termination resistance: 600 Hz) Level tolerance ± 1 dB per frequency duration 80 to 85 ms The terminal non-response signal (CRS) is a dual tone multi frequency (DTMF) signal according to the requirements of the following [Table 12].  Chat service provision system in wired telephone network. [Table 12] Nominal frequency 770 Hz, 1633 Hz Frequency tolerance ± 0.5% of nominal frequency Nominal frequency level -15 dBm / ton (termination resistance: 600 Hz) Level tolerance ± 1 dB per frequency duration 80 to 85 ms 13. The method of any one of claims 9, 10, and 12, wherein the chat send message (CSM) is Message type word (MT), message length word (ML), and short message parameters. Chat service provision system in wired telephone network. 10. The method of claim 9, wherein the first chat data message (CDM) is Message type word (MT), message length word (ML), time parameters, and announcement parameters. Chat service provision system in wired telephone network. The method of claim 11 or 13, wherein the second chat data message (CDM) is Message type word (MT), message length word (ML), time parameter, and short message parameter. Chat service provision system in wired telephone network. 4. The wired short message service center (ISMC) of claim 3, wherein If a short message is received by the calling terminal while performing chat synchronization control between the calling terminal and the called terminal, a short data message (SDM) is transmitted before transmitting a terminal permission signal (CPS) to the calling terminal. When the reception completion of the short data message (SDM) is confirmed, characterized in that for transmitting the terminal permission signal (CPS) to the calling terminal Chat service provision system in wired telephone network. 4. The wired short message service center (ISMC) of claim 3, wherein When a short message is received by the called terminal while performing chat synchronization control between the calling terminal and the called terminal, a short data message (SDM) is transmitted before transmitting a terminal permission signal (CPS) to the called terminal. When the reception completion of the short data message (SDM) is confirmed, characterized in that for transmitting the terminal permission signal (CPS) to the called terminal Chat service provision system in wired telephone network. The method of claim 1, wherein the wired short message service center (ISMC) If the called terminal is a terminal on the web, check the connection state of the called terminal by interworking with the chat server managing the called terminal, and if the called terminal is in the online state, performs a chat synchronization control for the calling terminal to the calling terminal. Mediating the chat message exchange between the called terminal and the called terminal. Chat service provision system in wired telephone network. The method of claim 1, wherein the wired short message service center (ISMC) If a short message is received by the calling terminal during the chat synchronization control between the calling terminal and the called terminal, the short data message (SDM) is transmitted before the terminal grant signal (CPS) is transmitted to the calling terminal. When the reception completion of the short data message (SDM) is confirmed, characterized in that for transmitting the terminal permission signal (CPS) Chat service provision system in wired telephone network. The method of claim 1, wherein the wired short message service center (ISMC) When a chat transmission message (CSM) is transmitted from the called terminal, a chat data message (CDM) corresponding to the chat transmission message (CSM) is transmitted to the calling terminal, and then a terminal permission signal (CPS) is transmitted to the calling terminal. And when a chat transmission message is transmitted from the calling terminal, transmitting a chat data message (CDS) corresponding to the chat transmission message (CSM) to the called terminal. Chat service provision system in wired telephone network. (a) a step in which a calling voice call is connected between the calling terminal and the wired short message service center (ISMC) as the calling terminal requesting a chat service dials a number of a wired short message service center (ISMC); (b) performing a chat request procedure with the calling terminal through the calling voice channel; (c) the wired short message service center (ISMC) calls the called terminal designated by the calling terminal to connect to the called voice channel and transmits a short data message (SDM) informing the called terminal of the chat request. Disconnecting the called voice channel; (d) when the called side voice call path between the called terminal and the wired short message service center (ISMC) is reconnected as the called terminal dials a number of the wired short message service center (ISMC), the called party voice call is reconnected. Performing a chat response procedure with the called terminal through a path; (e) performing a chat synchronization control between the calling terminal and the called terminal to mediate a chat message exchange between the calling terminal and the called terminal; Method of providing chat service in landline network. The method of claim 24, wherein The calling terminal transmits the calling number and the called number when the call is connected to the wired short message service center (ISMC). Method of providing chat service in landline network. 25. The method of claim 24, wherein b (b1) transmitting a terminal recognition signal (CAS) by the wired short message service center (ISMC) to the calling terminal; (b2) if a reception acknowledgment signal (ACK) is received from the originating terminal, transmitting a terminal acknowledgment message (CAM) informing of preparation for reception to the originating terminal; (b3) if a terminal acknowledgment message (ACK-C) indicating a chat transmission is received from the calling terminal, transmitting a terminal acknowledgment message (CAM) indicating the preparation for chatting reception to the calling terminal; (b4) when a chat request message (RCM) is received from the originating terminal informing the transmission of the chat message, the originating terminal and the wired short message service center (ISMC) are provided with a chat maintaining state. Method of providing chat service in landline network. 27. The system of claim 26, wherein the wired short message service center (ISMC) periodically transmits a terminal permission signal (CPS) to the calling terminal when the chatting maintenance state is established, and the calling terminal receives a terminal non-response signal within a preset time. (CRS) characterized in that for transmitting to the wired short message service center (ISMC) Method of providing chat service in landline network. The method of claim 24, wherein the c process is (c1) when the called terminal and the called voice call path are connected, transmitting a terminal recognition signal (CAS) by the wired short message service center (ISMC) to the called terminal; (c2) when the acknowledgment signal (ACK) is received from the called terminal, transmitting a terminal acknowledgment message (CAM) indicating the preparation for transmission of a short data message (SDM) to the called terminal; (c3) when the terminal acknowledgment message (ACK-C) indicating the reception preparation of the short data message (SDM) is received from the called terminal, transmitting the short data message informing the chat request to the called terminal; (c4) when the FSK data response message (ACK-F) indicating completion of reception of the short data message is received from the called terminal, disconnecting the called voice channel by transmitting a termination message (DCM) to the called terminal. Characterized in that it comprises a process Method of providing chat service in landline network. The method of claim 24, wherein the d process (d1) when the called voice call path is reconnected, the wired short message service center (ISMC) transmitting a terminal recognition signal (CAS) to the called terminal; (d2) when a reception acknowledgment signal (ACK) is received from the called terminal, transmitting a terminal acknowledgment message (CAM) informing of the reception preparation to the called terminal; (d3) if a terminal acknowledgment message (ACK-C) indicating that a chatting response message is to be transmitted from the called terminal is received, transmitting a terminal acknowledgment message (CAM) informing that the chatting response message is ready to be received; (d4) when the chat response message (ACM) is received from the called terminal, the called terminal and the wired short message service center (ISMC) is characterized in that it comprises a process of maintaining a chat state; Method of providing chat service in landline network. 30. The method of claim 29, wherein the wired short message service center (ISMC) periodically transmits a terminal permission signal (CPS) to the called terminal when the chat maintains, and the called terminal receives a terminal non-answer signal within a preset time. (CRS) characterized in that for transmitting to the wired short message service center Method of providing chat service in landline network. The method of claim 24, wherein the process e is (e1) the wired short message service center (ISMC) transmitting a chat data message (CDM) for the chat transmission message (CSM) transmitted from the calling terminal to the called terminal; (e2) the wired short message service center transmitting a chat data message (CDM) for the chat transmission message (CSM) transmitted from the called terminal to the calling terminal; (e3) Sending a terminal permission signal (CPS) to the calling terminal or the called terminal, allowing the transmission of the chat transmission message (CSM) so that the wired short message service center does not collide with the transmission of the chat data message (CDM). Characterized in that it comprises a process to Method of providing chat service in landline network. 32. The method of claim 31, wherein The calling terminal or the called terminal transmits a chat transmission message (CSM) including the chat data to the wired short message service center when there is chat data to be transmitted within a preset time after receiving the terminal permission signal (CPS). (ISMC), and if there is no chat data to transmit, the terminal non-response signal (CRS) characterized in that for transmitting to the wired short message service center (ISMC) Method of providing chat service in landline network. 25. The method of claim 24, When the wired short message service center (ISMC) receives a short message to the originating terminal while mediating a chat message between the originating terminal and the called terminal, the ISMC transmits a terminal permission signal (CPS) to the originating terminal. And transmitting a short data message (SDM) to the caller terminal when the reception completion of the short data message (SDM) is confirmed. Method of providing chat service in landline network. 25. The method of claim 24, If the short message service is received by the wired short message service center (ISMC) during the mediation of a chat message exchange between the calling terminal and the called terminal, before the terminal granting signal (CPS) is transmitted to the called terminal. Transmitting a short data message (SDM), and transmitting the terminal permission signal (CPS) to the called terminal when reception of the short message (SDM) is confirmed. Method of providing chat service in landline network.

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