KR100509103B1 - Method and system for providing call waiting service - Google Patents

Abstract

The present invention relates to a system and a method for providing a call waiting service, and in particular, the present invention transmits a call waiting tone to a called party when a call request is received from a third party during a call, indicating that there is a call request from the outside. In the call waiting service providing system, it is connected to a plurality of MSCs and local exchanges, and database related information of subscribers registered in various types of guide sounds and whisper services, and at the request of the MSC or the local exchange, It includes a TCID server that provides a whisper service. Therefore, according to the present invention, when a subscriber receives a call from a third party while the service subscriber is in a call, the service subscriber receives a specific guide sound (eg, announcement, melody, natural sound, etc.) applied by the service subscriber instead of a mechanical waiting sound. By providing the subscriber, the service subscriber has the effect of enjoying the quality of the call waiting service without obstacles and discomfort to the call.

Description

System and method for providing call waiting service {Method and system for providing call waiting service}

The present invention relates to a system and method for providing a call waiting service, and more particularly, when a call is received from a third party to a subscriber while a subscriber of the call waiting service is busy, a conventional simple standby sound (that is, two seconds) The present invention relates to a call waiting service providing system and method for providing a subscriber with guide sounds in various forms (for example, announcements, melodies, natural sounds, etc.).

In general, call waiting service is a service that allows a subscriber to wait for a while and receive an incoming call when another call is received during a call.

Conventional call waiting service in a private branch exchange (PBX) uses subscriber & man machine communication (MMC) in an input output processor (IOP) to handle subscriber data in a private exchange. Subscriber data handling (SDH) is used to register the call waiting service. After the call waiting service is registered, the calling party registered in the service dials the called party for the call connection, and the call connection is made so that the calling party and the called party become available for the call.

If the calling party and the called party are busy, when a call is received from the third calling party, the call waiting service is registered and the third calling party hears a ring back tone and makes a call. The calling subscriber who is doing the call hears a waiting sound according to the call waiting service, and the calling subscriber registered in the service can call the desired called subscriber by selecting the hook flash.

However, the conventional call waiting service transmits a waiting sound corresponding to a 'dutou' sound simply for 2 seconds to a registered calling subscriber, but such mechanical waiting sound causes an interruption in the call and causes discomfort. In addition, it can be seen that the call request is received from the outside by the waiting sound transmitted during the call, but there is a problem in that the call request counterpart cannot be identified.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a service subscriber instead of a mechanical waiting sound when a call is received from a third party while a service subscriber is in a call. The present invention provides a call waiting service providing system and method for providing a specific guide sound (eg, announcement, melody, natural sound, etc.) applied to a service subscriber.

Another object of the present invention is to set the service subscriber to send a call waiting tone to the announcement, and if the call from the third party to the subscriber while the service subscriber is on the phone, to inform the identity of the third party The present invention provides a system and a method for providing a call waiting service, which enables a service subscriber to recognize who is a call request counterpart.

In the present invention for achieving the above object, in a call waiting service providing system for informing a call request from the outside by sending a call waiting tone to the called party when there is a call request from a third party during a call, A plurality of BTSs connected to each mobile terminal and transmitting / receiving call processing data to perform transmission / reception of radio signals and conversion and encryption / decryption of communication protocols for each mobile terminal; A plurality of BSCs, each connected to a plurality of BTSs, for managing and controlling the BTSs so as to perform a function of allocating a communication channel to a mobile terminal, a function of determining handover, and a function of maintaining call continuity while moving; It is connected to a plurality of BSCs, and performs circuit switching between subscribers, I / O relay processing, handoff, and roaming functions to provide mobile communication services to mobile subscribers, and receives incoming call request signals from third parties. A plurality of MSCs for switching channels to query whisper service registration on the side and to provide the whisper service to the called party; Connected to a number of MSCs, each of which is required to provide a variety of mobile phone services, ranging from mobile terminals that have jurisdiction over a given area and located in that area to their subscriber numbers, terminal unique numbers, and additional service selection information. An HLR for storing / managing information, retrieving whether a whisper service is queried from the MSC, and transmitting the result to the MSC; It is connected to each landline telephone and performs circuit switching between subscribers and I / O relay processing functions to provide wired communication services to landline telephone subscribers, and receives call request signals from third parties. A plurality of national exchanges for switching whether a channel is switched to provide a whisper service to a called party by inquiring whether a whisper service is registered; A gateway which is connected to a plurality of MSCs and local exchanges, and which matches a communication protocol between a general telephone network and a mobile communication network; It is connected to a number of national exchanges, and stores / manages all the information necessary to provide various landline telephone services, including subscriber numbers, terminal identification numbers, and additional service selection information of wireline subscribers, and prompts prompting from the national exchange. An additional service providing server for searching for service registration and transmitting the result to the local exchange; And a TCID server connected to a plurality of MSCs and local exchanges, which database related information of subscribers registered in various types of guide sounds and whispering services, and provide whispering services to the subscribers at the request of the MSC or the local exchange. Characterized in that it comprises a.

In addition, the present invention provides a call waiting service for transmitting a call waiting sound to the called party when there is a call request from a third party during a call to notify that there is a call request from the outside, through the ARS or the Internet Performing a series of procedures for providing a whisper service, and databaseing related information of subscribers registered to the whisper service through the Internet; If there is a call request from a third party, inquiring whether the called party's whisper service is registered with the call request of the third party; If the called party is registered with the whispering service, transmitting the third party's telephone information to the TCID server; Retrieving guide sound information corresponding to the third party's telephone information and transmitting the guide sound to a specified channel; And in response to a call request from a third party, connecting the third party to the call path and switching to return to the existing call path when the third party and the called party are terminated. .

Hereinafter, preferred embodiments of a call waiting service system and method according to the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of a call waiting service system 100 according to the present invention, the service providing system 100 is a mobile terminal (11, 12, 13), the base station radio (BTS: Base Transceive System) (20, 25), Base Station Controller (BSC) (30, 35), Mobile Switching Center (MSC) (40, 45), Home Location Register (HLR) ( 50), the gateway 60, the local exchanges 70 and 75, the supplementary service providing server 80, the landline telephones 81 and 82, and the TCID server (Talking Caller ID Server) 90.

The BTSs 20 and 25 are connected to the respective mobile terminals 11, 12, and 13, and transmit / receive call processing data to transmit / receive radio signals for the mobile terminals 11, 12, and 13 and a communication protocol. Performs conversion and encryption / decryption. Here, the calling party BTS 20 is defined as the first BTS and the called party BTS 25 is defined as the second BTS.

The BSCs 30 and 35 are connected to each of the BTSs 20 and 25, which allocates the communication channel to the mobile terminals 11, 12 and 13, determines the handover function, and maintains the continuity of the call while moving. Manage and control the BTS (20, 25) to perform a function or the like. Here, the calling party BSC 30 is defined as the first BSC, and the called party BSC 35 is defined as the second BSC.

The MSCs 40 and 45 are connected to the respective BSCs 30 and 35, and perform functions such as circuit switching, input / output relay processing, handoff, and roaming between subscribers in order to provide mobile communication services to mobile subscribers. Here, the calling MSC 40 is defined as the first MSC, and the called MSC 45 is defined as the second MSC.

The HLR 50 is connected to each of the MSCs 40 and 45, and the subscriber number and terminal unique number and additional services (e.g., caller ID service, Store all information necessary to provide various mobile phone services up to optional information.

The gateway 60 is connected to each of the MSCs 40 and 45 and the local exchanges 70 and 75, and serves to match the communication protocol between the general telephone network and the mobile communication network.

The national exchanges 70 and 75 are connected to the gateway 60 and the respective landline telephones 81, 82 and 83, and provide wireline communication services to the landline telephone subscribers through the landline telephones 81, 82 and 83. It performs functions such as circuit switching between subscribers and I / O relay processing. Here, the calling party's local exchange 70 is defined as the first local exchange and the called party's local exchange 75 is defined as the second local exchange.

The supplementary service providing server 80 is connected to each of the local exchanges 70 and 75, and has all the information necessary to provide various fixed line telephone services up to the subscriber number, the terminal unique number, and the supplementary service selection information of the landline telephone subscribers. Save / manage

TCID server 90 is connected to each MSC (40, 45) and local exchange (70, 75), and various types of guide sounds (for example, announcements, melodies, natural sounds, etc.) and busy during the present invention Database of relevant information (e.g., setup ring tone information, phone number registration information, etc.) of subscribers registered in the standby service (hereafter referred to as 'whisper service') to distinguish it from the existing call waiting service. (40, 45) or at the request of the national exchange (70, 75) serves to provide a whisper service to the subscriber. In order to provide the whisper service, E1 / T1 relay lines should be added to each MSC (40, 45) and the local exchange (70, 75), and related modules for communication in accordance with the common line signaling method (CCS No. 7) should be installed. do. In addition, the TCID server 90 should be equipped with a conference call circuit that supports multi-party calls.

2 is a block diagram showing the configuration of a TCID server 90 according to the present invention. The TCID server 90 includes an ARS server 91, a web server 92, a management server 93, and a DB 94. It is configured to include.

The ARS server 91 is connected to a general telephone or a mobile terminal through a PSTN, and provides information related to the procedure and guide tone selection required for registration with a general telephone or a mobile terminal (for example, a guide sound type, a charge information, and the like). It performs overall control to database various types of information (for example, selected guide tone information, etc.) applied from a telephone or a mobile terminal. The ARS server 91 includes an EEPROM or an EPROM, which is a memory chip that can be electrically erased and rewritten, and is preferably implemented to easily input or modify desired voice data. It is preferable to use MPEG-2 or Dolby AC-3 as the compression method of the audio data.

The web server 92 is connected to the user's web browser through the Internet, the server name is registered in the domain name server, and the general Internet user can search the information in the form of URL (Uniform Resource Locator). The web server program is installed and executed to smoothly operate online sites. The web server 92 includes a server program executed to process an information retrieval request in the form of an URL authorized by the information user, and a server-client interaction to process the information request of the information user (e.g., registration, guide tone selection, etc.). Contains a processing program that supports the action. Server programs include NCSA, CERN, Apache, JIGSAW, a server for Unix, IIS, a server for Windows NT, and WebSite, a server for Windows NT and Windows 95/98. The processing program is generally standardized as a common gateway interface (CGI). Use a method of communicating information. The information transmitted to the web server 92 in conformity with the CGI format is processed by the CGI program installed in the web server 92 by appropriately interpreting the information request of the information user according to the CGI standard format. That is, the web server 92 performs a member registration procedure of the information user and manages information on the type of guide sound selected by the user of the information, phone book registration, and guide sound setting for each registrant registered in the phone book. Perform.

The management server 93 is connected to the MSCs 40 and 45 and the local exchanges 70 and 75, and receives information requests (eg, TTS (Text) from the MSCs 40 and 45 and the local exchanges 70 and 75. -To-Speech) request], retrieves relevant information and outputs a TTS message. Therefore, the management server 93 includes a TTS engine that outputs a text message as a voice, and preferably operates to output a TTS message through a designated channel. In addition, the management server 93 is preferably operated to meet the needs of the user, including the function of periodically upgrading the type and content of the guide sound in conjunction with the external device. Although FIG. 2 illustrates that the web server 92 and the management server 93 are separated from each other, this is to distinguish the servers by functions, and the web server 92 may be implemented to include the functions of the management server 93 in the web server 92. Of course.

The DB 94 is interconnected with the ARS server 91, the web server 92, and the management server 93, stores various information for providing a whisper service, and extracts the corresponding information upon request of specific information. It plays the role of sending to the designated path. The DB 94 includes subscriber information registered to the whisper service, all guide sound information handled by the whisper service, phone book registration information for each subscriber, guide sound setting information for each subscriber, usage status and billing information for each subscriber, and the like.

Hereinafter, the operation relationship of the call waiting service system and method according to the present invention will be described in more detail with reference to the accompanying drawings.

In operating the whispering service of the present invention, the whispering service using the ARS server and the whispering service using the web server can be mixed, the whispering service using the ARS server is received from the outside during the call regardless of the registration of the specific telephone requester This is useful when you want to apply a specific tone to inform the fact uniformly, whisper service using a web server is useful when you want to set the tone separately for each registrant registered in the phone book selection and phone book. The application procedure of the whisper service using the ARS server is similar to the application procedure of the '700' service, which is a general ringtone download service, and thus will not be described in detail.

3 is a table showing an application result of a whisper service using a web server according to the present invention. Those who wish to use the whisper service according to the present invention should apply for call waiting service, and in order to receive various whisper services, it is preferable to apply for caller ID service.

First, a person who wants to use a whisper service accesses a site that provides a whisper service and then performs a membership registration procedure. The whisper service subscriber then selects the desired tone and creates a phone book. As illustrated in FIG. 3, it is preferable to implement the phone book and the whisper service history prepared by the subscriber freely modified according to the subscriber's selection, and separately set the guide sound for each individual registered in the phone book. The guide sound in the whispering service is provided with various kinds of announcements (ie, TTS messages), melodies (eg, songs, pop songs, classics, etc.), and natural sounds (eg, birds sounds, water sounds, etc.) to satisfy subscribers' needs. It is desirable to implement this. In addition, announcements can be entered directly, as well as designated announcements, according to the subscriber's choice to create their own unique announcements (eg, "Call from XX", "Call from friend XX", etc.). Operate to produce. In addition, when a subscriber sets a plurality of guide sounds, the guide sounds may be set differently for each group (for example, a family may be set as a TTS message and a coworker may be set as a melody). Each information entered by the subscriber is stored in the DB and used later.

4 is a flow chart illustrating the overall operation of a whisper service according to the present invention. Prior to the detailed description of the present invention, for convenience of description, the first mobile terminal during a call between the calling mobile terminal, the first mobile terminal, the called mobile terminal, the second mobile terminal, the first mobile terminal and the second mobile terminal period. The mobile terminal that attempted to make a call request to the third mobile terminal, the sender's landline telephone to the first landline telephone, and the called party's mobile terminal to the first landline telephone during the call of the second landline telephone, the first landline telephone and the second landline telephone. The landline that attempted the call request is defined as a third landline. When a call is received from a third party during a call, it is assumed that the called party is registered in the call waiting service, the caller ID service, and the whisper service according to the present invention.

The whispering service of the present invention is applied to both a call using a mobile communication network and a call using a PSTN, and a call type (for example, a mobile terminal and a mobile terminal period call, a landline and a wireline period call, a mobile terminal and a wireline period call) According to the whisper service provider and the format is somewhat different, but the first mobile terminal and the second mobile terminal during the call during the call when the call request from the third mobile terminal to the first mobile terminal will be described mainly, Cases (ie landline and landline phone calls, mobile terminals and landline phone calls) are described in more detail.

First, the MSC determines whether there is a call request from the outside (that is, the third mobile terminal) to the first mobile terminal during a call between the first mobile terminal and the second mobile terminal period (S410). Here, the presence or absence of the call request from the landline is determined by the national exchange. As a result of the determination, if there is no call request from the outside, the current path is maintained, and if there is a call request from the outside, the MSC queries the HLR whether the whisper service is registered in the first mobile terminal (S420). Since the various additional service registration information for the mobile terminal is stored in the HLR, and the various additional service registration information for the landline phone are stored in the additional service providing server, the MSC or the local exchange can query the additional service registration information for the called party. Can be.

If the called party (that is, the first mobile terminal) is registered with the whisper service (S430), the MSC transmits the calling information of the calling party (ie, the third mobile terminal) to the TCID server (S440), and the TCID server receives the incoming call. The guide sound information of the side is searched through the DB, and the set sound is transmitted to the corresponding channel using the TTS engine (S450). Here, the TCID server searches the called party's phone book (shown in FIG. 3) through the DB, and if the calling party is registered in the phone book, transmits a guide tone set to the registered calling party, and sends the phone book to the phone book. If not registered, the set tone is normally transmitted. As shown in Fig. 3, the whisper service subscriber may register a phone book and set different guide tones according to the individual or group of the registered phone book, and the unregistered phone number is uniformly assigned to a specific guide tone (e.g., By setting a specific melody), a person who is registered in the phone book and one who is not registered can hear and identify only the guide sound. For example, when there is a call request from a person registered in the phone book, a guide tone may be transmitted in a TTS message, and when a call request is received from a person not registered in the phone book, a specific melody (for example, a song or a pop song) may be transmitted. .

Next, the MSC switches the channel to the called party (ie, the first mobile terminal) to provide the set whisper service (S460). The called party listens to the whisper service during a call to determine whether to answer. The MSC determines whether the called party answers (S470), and if there is no answer from the called party, the MSC outputs a general busy guide message to the calling party (that is, the third mobile terminal) (S480). (Ie, the third mobile terminal) and connects the call path between the called party (ie, the first mobile terminal) (S490). Even when the called party is not registered in the whisper service in step S430, the process proceeds to step S480 and outputs a general busy guide message to the calling party.

In a call between a landline phone and a mobile terminal, when the mobile terminal makes a call request to a wired telephone that is in a call or when the landline phone requests a call to a mobile terminal that is busy, mutual support must be provided during the MSC and the local exchange period. These functions are handled by the gateway that matches the communication protocol between the general telephone network and the mobile communication network.

FIG. 5 is a conceptual diagram schematically illustrating a channel switching processing method between an MSC or a local exchange and a TCID server for a whisper service according to the present invention, and a call request from a third mobile terminal during a call between a first mobile terminal and a second mobile terminal period. Illustrates a method of handling channel switching when present.

First, when the communication path between the first mobile terminal and the second mobile terminal is connected, the MSC or the local exchange connects the TX terminal of the first mobile terminal and the RX terminal of the second mobile terminal (①), Connect the TX terminal and the RX terminal of the first mobile terminal (②).

Next, when there is a call request from the third mobile terminal to the first mobile terminal, the TCID server connects the TX terminal of the ringback tone or sound tone to the RX terminal of the third mobile terminal (③), and the TX terminal of the second mobile terminal. And the TX terminal of the guide sound to the input terminal of the conference call circuit (④, ⑤), and the output terminal of the conference call circuit is connected to the RX terminal of the first mobile terminal (⑥). Here, the TCID server must be provided with a separate conference call circuit to provide a whisper service, since the conference call circuit in the exchange is implemented to support only general conference calls and cannot support a separate whisper service during a call. . Accordingly, the TCID server routes the first mobile terminal and the second mobile terminal in a call to a relay line (eg, an extended E1 trunk) to provide a whisper service.

Next, when the first mobile terminal responds to the call request of the third mobile terminal, the MSC or the local exchange connects the TX terminal of the third mobile terminal and the RX terminal of the first mobile terminal (⑦), and the first mobile terminal. Connect TX terminal of and RX terminal of third mobile terminal (⑧). At this time, the second mobile terminal is in a standby state, and when the call between the first mobile terminal and the third mobile terminal is completed, the MSC or the local exchange again disconnects the TX terminal of the first mobile terminal and the RX terminal of the second mobile terminal. (①), the TX terminal of the second mobile terminal and the RX terminal of the first mobile terminal (②) by switching (1) and the first mobile terminal and the second mobile terminal is switched to the call state.

The above description is only for explaining one embodiment, and the present invention is not limited to the above-described embodiment and can be variously changed within the scope of the appended claims. For example, the shape and structure of each component specifically shown in the embodiments of the present invention may be modified.

As described above, according to the system and method for providing a call waiting service according to the present invention, when a subscriber receives a call from a third party while the service subscriber is talking, a specific guide tone applied by the service subscriber instead of a mechanical waiting sound By providing the service subscriber (eg, announcement, melody, natural sound, etc.) to the service subscriber, the service subscriber can enjoy high quality call waiting service without obstacles and discomfort to the call.

In addition, the present invention is to set the service subscriber to send a waiting tone to the announcement, and when the call from the third party to the subscriber while the service subscriber is talking, by telling the identity of the third party, The service subscriber can recognize the call request counterpart and determine the priority of the call.

1 is an overall configuration diagram of a call waiting service system according to the present invention,

2 is a block diagram showing the configuration of a TCID server according to the present invention;

3 is a table showing an application result of a whisper service using a web server according to the present invention by way of example,

4 is a flowchart illustrating the overall operation of a whisper service according to the present invention;

5 is a conceptual diagram schematically illustrating a channel switching processing method between an MSC or a local exchange and a TCID server for a whisper service according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

11, 12, 13: Mobile terminal 20, 25: BTS

30, 35: BSC 40, 45: MSC

50: HLR 60: gateway

70, 75: local exchange 80: additional service providing server

81, 82, 83: Landline Phone 90: TCID Server

91: ARS Server 92: Web Server

93: management server 94: DB

Claims (7)

delete In the call waiting service providing system for notifying a call request from the outside by sending a call waiting tone to the called party when there is a call request from a third party during a call, A plurality of BTSs connected to each mobile terminal and transmitting / receiving call processing data to perform transmission / reception of radio signals and conversion / encryption / decryption of communication protocols for each mobile terminal; A plurality of BSCs, each connected to the plurality of BTSs, for managing and controlling the BTSs so as to perform a function of allocating a communication channel to the mobile terminal, a function of determining handover, and maintaining a continuity of a call while moving; Each of which is connected to the plurality of BSCs and performs circuit switching between subscribers, input / output relay processing, handoff, and roaming functions to provide mobile communication services to mobile subscribers, and receives call request signals from third parties. A plurality of MSCs that switch whether a channel is provided to provide the whisper service to the called party by inquiring whether a called party is registered for the whisper service; It is connected to the plurality of MSCs, and is required to provide various mobile phone services ranging from mobile terminals which have jurisdiction over a predetermined region and located in the region, to subscriber numbers, terminal unique numbers, and additional service selection information of the subscribers. An HLR that stores / manages all the information, retrieves whether the whisper service is registered from the MSC, and transmits the result to the MSC; It is connected to each landline telephone and performs circuit switching between subscribers and input / output relay processing functions to provide wireline communication service to wireline telephone subscribers, and receives call request signals from third parties. A plurality of exchanges for switching a channel to query whether a whisper service is registered and to switch the channel to provide the whisper service to the called party; A gateway connected to the plurality of MSCs and the local exchanges, the gateway matching the communication protocol between the general telephone network and the mobile communication network; It is connected to the plurality of national exchanges, and stores / manages all the information necessary to provide various landline telephone services, including subscriber numbers, terminal unique numbers, and additional service selection information of landline telephone subscribers, and queries from the local exchange. An additional service providing server for searching whether the whisper service is registered and transmitting the result to the local exchange; And Connected to the plurality of MSCs and the local exchange, the database of the various types of guide sound and the subscriber information registered in the whisper service to provide a whisper service to the subscriber at the request of the MSC or the national exchange TCID Server It includes; The TCID server An ARS server that provides information related to a procedure and a selection of a guide sound necessary for registration of the whisper service and controls the database so as to database various types of information authorized from a subscriber; It is connected to the user's web browser through the Internet, performs the user registration procedure, and manages the information on the type of guide sound selected by the user, the phone book registration, and the setting of the guide sound for each registrant registered in the phone book. A web server; A management server connected to the MSC and the local exchange, and collectively controlling to receive a whisper service request signal from the MSC and the local exchange, retrieve related information, and provide a set whisper service; And Interconnected with the ARS server, web server, and management server, subscriber information registered in the whisper service, all the guide sound information handled by the whisper service, the phone book registration information and registrant tone information for each subscriber, subscribers Call waiting service service system, characterized in that it comprises a database for storing the use status and billing information for each star, and extracts the information and sends it to a specified path when a specific information request. The method of claim 2, Add E1 / T1 relay lines to the plurality of MSCs and local exchanges, The plurality of MSCs and the local exchanges and the TCID server communicate according to a common line signaling method (CCS No. 7), The TCID server includes a TTS engine for outputting a text message as a voice, and a call waiting service providing system, characterized in that it has a conference call function to support a multi-party call. The method of claim 2, The guide sound provided by the whisper service includes a guide comment, a melody, and a natural sound, and the guide sound is set in a different manner for each person or group registered in the phone book and listened to the guide sound. Call waiting service providing system, characterized in that to identify. delete In the call waiting service providing method for sending a call waiting sound to the called party when the call request from the third party during the call to notify the caller from the outside, (a) performing a series of procedures for providing a whisper service through ARS or the Internet, and databaseing related information of subscribers registered with the whisper service through the Internet; (b) if a call request is received from a third party, inquiring whether the called party's whisper service is registered with the third party's call request; (c) if the called party is registered with the whisper service, transmitting the third party's telephone information to a TCID server; (d) searching for guide tone information corresponding to the third party's telephone information and transmitting the set guide tone to a designated channel; And (e) connecting a call path between the third party and the called party in response to the call request of the third party, and switching to return to the existing call path when the call between the third party and the called party is terminated; Including, Step (d) (d1) routing an existing communication path in a call to an arbitrary relay line and performing a conference call using the conference call function with the third party; (d2) when the multiparty call is made, transmitting a ringback tone or sound tone to the third party and switching a communication channel to a called party requested by the third party; And and (d3) transmitting the guide sound retrieved through the switched channel to the called party. The method of claim 6, The guide sound provided by the whisper service includes a guide comment, a melody, and a natural sound, and the guide sound is set in a different manner for each person or group registered in the phone book and listened to the guide sound. Call waiting service providing method characterized in that it can identify.