KR100494330B1 - System and method for ring back tone service using service switching point - Google Patents

Abstract

The present invention relates to a ringback tone service system and method using a service switching point (SSP), wherein a home location register registers subscription information on a ringback tone service and routing information to a ringback tone service exchange, and is determined from an originating exchange. When requesting the location inquiry of the called party, after receiving the incoming routing information through communication with the destination exchange, checking whether the called party subscribes to the ringback tone service and transmitting a message for call connection to the ringback tone service exchange to the calling exchange. Process; When a call connection is requested from an originating exchange, the ringback tone service exchange establishing a call with the destination exchange and monitoring whether a basic ringback tone is transmitted from the destination exchange; When the basic ringback tone is transmitted, the ringback tone service exchange requests the provision of the sound source to the sound source providing apparatus, and then transfers the sound source provided from the sound source providing apparatus to the call exchanger. According to the present invention, by changing only the operation profile for the home location register on the mobile communication network has the advantage that it is possible to reduce the cost of changing the operation profile for the components of the mobile communication network for the ringback tone service.

Description

System and method for ring back tone service using service switching point

The present invention relates to a ringback tone service system and method, and more particularly, a sound source set by a called subscriber who subscribes to a ring back tone (RBT: Ring Back Tone) service using a service switching point (SSP). The present invention relates to a ringback tone service system and a method using an SSP provided as a substitute sound.

In general, when a predetermined caller attempts to make a telephone call to a called party, in the existing mobile communication network, the called party causes the end-registered exchange (called exchange) to provide the caller with a uniform sound source (hereinafter referred to as a basic ringback tone). The system is adopted. As such, the existing mobile communication network only provides a uniform basic ringback tone, and does not provide a specific sound source reflecting the intention of the called party as the ringback tone. As a result, various ringback tone service methods have been proposed to solve the basic ringback tone providing method in the existing mobile communication network.

Hereinafter, an example of a method of providing a specific sound source set by a called party as a ringback tone (hereinafter, referred to as a ringback tone service method) will be described with reference to FIG. 1.

First, a home location register (HLR) 11 receives ringback tone service subscription information and ringback tone for a mobile subscriber from a ringback tone service provider terminal device (not shown) connected through the Internet (not shown). Receives routing information (i.e., Routing Digits) that can be routed to the sound source providing device 14, to the corresponding mobile communication subscriber profile of the provided subscriber database (not shown). Register (s10).

When the location registration of the mobile communication subscriber is requested from the destination exchange 12 (s11), the home location register 11 confirms the subscription of the ringback tone service based on the profile of the mobile communication subscriber stored in the subscriber database. (s12), As a result, when it is confirmed that the subscriber is a ringback tone service (hereinafter referred to as a called subscriber), the ringback tone service setting information and the routing information of the sound source providing device 14 for the corresponding called party respond according to step s11. Included in the message and delivered to the destination exchange 12 (s13).

At this time, the destination exchange 12 stores / manages the ringback tone service setting information for the called subscriber received from the home location register 11 and routing information to the sound source providing device 14 (s14). In general, the processes s10, s11, s12, s13, and s14 described above are performed before the caller attempts a telephone call.

Next, when the caller attempts to make a phone call, a process in which the sound source set by the called subscriber is provided to the caller as an alternative sound of the basic ringback tone is described as follows. When the caller attempts to make a telephone call to the called party subscribed to the ringback tone service, the calling exchange 10 sends a message (i.e., a location query request message) to the home location register 11 requesting a location inquiry for the called party. Transmit (s15).

At this time, the home location register 11 responds to the location query request message with the destination routing information (TLDN: Temporary Local Directory Number) provided as a request for incoming routing information to the destination exchange 12 (that is, location query). A response message) is transmitted to the originating exchange 10 (s16, s17, s18).

The originating exchange 10 requests an ISUP call connection to the destination exchange 12 based on the received location query response message to form a mutual call path (s19).

On the other hand, when the terminating exchange 12 is requested to access the ISUP call from the originating exchange 10, it checks the service setting information of the corresponding called party stored in advance, and the ring subscriber is a ringback tone service and the ringback tone service is activated. If it is confirmed that (s20), on the basis of the routing information to the pre-stored sound source providing device 14 to request the ISUP call connection to the sound source providing device 14 to form a mutual communication path (s21). At this time, the incoming call number and the outgoing call number are also provided.

The sound source providing device 14 stores various sound sources, and requests a sound source code from the sound source providing control server 13 based on the incoming call number and the outgoing call number provided from the incoming exchange 12. It extracts the sound source corresponding to the sound source code and provides it to the caller as a substitute sound of ringback tone (s22, s23, s24). Here, the sound source providing control server 13 manages the code information for the sound source set by the called party in advance and the caller information (for example, the outgoing call number) to receive the sound source as a substitute sound of the basic ringback tone for each called party. Doing.

Then, the destination exchange 12, while providing the sound source to the caller, if it is recognized that the incoming subscriber received the call, requests the release of the ISUP call to the sound source providing device 14 to release the call with the sound source providing device 14 After that (s25), through the communication path formed mutually with the calling exchange 10 connects the call between the caller and the called subscriber (s26).

As described above, the existing ringback tone service method has an advantage that it is possible to provide the callers with the sound source set by the called subscriber. However, when the mobile communication network is provided with a plurality of home location registers and exchanges by changing the operation profile of the exchange as well as the home location register which is a component on the existing mobile communication network, the home location register And a change in the operating profile for the exchange can cause huge expense.

The present invention has been made to solve the conventional problems as described above, by minimizing the change of the operation profile for the components (ie home location register, switch, etc.) located on the existing mobile communication network by the called party An object of the present invention is to provide a ringback tone service system and method using an SSP to provide a set sound source as a substitute for a basic ringback tone.

The ringback tone service system using the SSP according to the present invention for achieving the above object, the subscriber registration information and the routing information to the ringback tone service exchange for the ringback tone service of the mobile communication subscriber to the subscriber database provided, When a message for requesting the location of a predetermined called party is transmitted from an originating exchange, after receiving incoming routing information through communication with a destination exchange corresponding to the called party, the called party checks whether the called party subscribes to a ringback tone service. If the subscriber subscribes to the ringback tone service and the ringback tone service is set to the active state, a response message including routing information, called party information, and incoming routing information to the ringback tone service exchange for a call connection to the ringback tone service exchange is provided. A home location register for transmitting to the calling exchange; If the routing information for the call connection to the ringback tone service exchange is recognized by analyzing the response message received from the home location register, requesting the call connection to the ringback tone service exchange includes caller information, called party information, and incoming routing information. An originating exchange that carries a message; When the call is established with the destination exchange based on the message received from the originating exchange, if the base ringback tone is recognized from the destination exchange and the base ringback tone is recognized, the sound source providing device determines the A ringback tone service exchanger for requesting provision, transmitting a message for setting up a call with a sound source providing apparatus to an originating exchange, and providing the sound source delivered from the sound source providing apparatus to a corresponding originating exchange as a substitute sound of a basic ringback tone; And register / manage information about subscribers who have subscribed to the sound source providing service, information about the type of sound source set by the subscriber, and information on the caller who will receive the set sound source as a substitute for the basic ringback tone, and a specific called party from the ringback tone service exchanger. When the provision of the sound source set by the request is requested, it comprises a sound source providing apparatus for extracting and transmitting a sound source set to be provided to a predetermined caller by the called party.

In addition, the ringback tone service method using the SSP according to the present invention for achieving the above object, in the method for providing a sound source set by the called subscriber using a ringback tone service exchanger as a substitute sound of the basic ringback tone, ( a) registering, by the home location register, with or without subscription information on the ringback tone service of the mobile communication subscriber and routing information to the ringback tone service exchanger in the subscriber database; (b) When a message for requesting the inquiry of a predetermined called party is transmitted from the calling exchange, the home location register receives the incoming routing information through communication with the called exchange corresponding to the called party, and then based on the subscriber database. As a result of confirming whether a ringback tone service is subscribed to the called party, if the called party is a subscriber to the ringback tone service and the ringback tone service is set to an active state, a ringback tone service exchanger for a call connection to the ringback tone service exchange Sending a response message including routing information, called party information, and incoming routing information to the calling exchange; (c) When a call connection is requested from the originating exchange, the ringback tone service exchange recognizes the called exchange based on the incoming routing information received in the call connection request, and transmits the calling party information and the incoming routing information to the called exchange. Setting up a call with a destination exchange corresponding to the call, and monitoring whether a basic ringback tone is transmitted from the destination exchange; And (d) when a basic ringback tone is sent from the destination exchange, the ringback tone service exchange requests the sound source providing device to provide a sound source set by the called party, and sets up a call setup with the sound source providing device to the originating exchange. After transmitting the message for, the sound source transmitted from the sound source providing device comprises the step of providing to the originating exchange as a substitute sound of the basic ringback tone, characterized in that it comprises.

Hereinafter, a preferred embodiment of a ringback tone service system and method using an SSP according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic configuration diagram of a ringback tone service system using an SSP according to the present invention. As shown in FIG. 2, the ringback tone service system 100 according to the present invention has a service switching point (SSP), hereinafter, Ringback tone service switch) 110, IP (Intelligent Peripheral, hereinafter referred to as sound source providing device) 120, GS (Gateway Switch, hereinafter referred to as gateway) 130, O_MSC (Originating Mobile Switching Center, (Hereinafter referred to as an outgoing exchange) 141, Terminating Mobile Switching Center (T_MSC) 142, No. 7 network 150, HLR (Home Location Register) ) 160, a communication network (eg, the Internet) 170, and a ringback tone service subscriber management device 180.

Here, the home location register 160 is connected based on the originating exchange 141 and the destination exchange 142 and No. 7 network 150, the originating exchange 141, the destination exchange 142 and the gateway 130 Are interconnected through ISUP signaling based on No. 7 network 150. Then, the gateway 130 and the ringback tone service exchanger 110, the ringback tone service exchanger 110, and the sound source providing device 120 are connected through ISUP signaling, and the sound source providing device 120 and the ringback tone service subscriber management device are provided. 180, the home location register 160 and the ringback tone service subscriber management device 180 are interconnected through the Internet 170.

In general, there are ISUP, R2, ISDN-PRI, etc. relay signaling between stations (i.e. exchange and exchange period). In the present invention, a ringback tone service system and a ringback tone service method using an ISUP signaling method will be described.

In addition, hereinafter, the ring back tone service method according to the present invention will be described with reference to FIGS. 3 to 5, but will be described in parallel with the operation of each component of the ring back tone service system 100 shown in FIG. 2. .

First, prior to explaining the ringback tone service method based on the operation between the components of the ringback tone service system 100 according to the present invention, the ringback tone service subscriber management device 180 and the sound source providing device 120, Referring to the operation between the ringback tone subscriber management device 180 and the home location register 160 as follows.

A mobile subscriber provides a service (e.g., a ringback tone service according to the present invention) for providing a specific sound source as a substitute for a basic ringback tone to a provider (e.g., an offline mobile communication agency or an online web server). Upon request, the ringback tone service subscriber management device 180 interworking with the operator receives information (eg, name, social security number, telephone number, etc.) about the subscriber who has subscribed to the ringback tone service according to the present invention, and the sound source set by the subscriber. Register / manage information (eg, a phone number) for a caller to be provided with the type of the sound source and its set sound source as a substitute for the basic ringback tone. In addition, according to a request of a subscriber who subscribes to a ringback tone service according to the present invention, the sound source set by the subscriber may be classified and registered / managed by caller group, caller age, caller gender, and call access request time zone.

Subsequently, the ringback tone service subscriber management device 180 provides subscriber information for subscribing to the ringback tone service according to the present invention, the type of sound source set by the subscriber, and caller information to be provided as a substitute sound of the basic ringback tone. 170 to the sound source providing apparatus 120, and also, for the mobile communication subscriber to the ringback tone service subscription information according to the present invention and information for routing to the ringback tone service switch 110 (that is, routing information) ) Is transmitted to the home location register 160 via the Internet 170.

The sound source providing apparatus 120 stores various sound sources, and stores subscriber information, sound source type, and caller information subscribed to the ringback tone service according to the present invention received from the ringback tone service subscriber management device 180 for each subscriber. Manage.

On the other hand, the home location register 160 has all the functions as a component of the existing mobile communication network, from the ringback tone service subscriber management device 180, the presence information and the subscription information of the mobile communication subscriber to the ringback tone service according to the present invention The router receives the routing information to the backtone service exchanger 110 and registers / manages the corresponding subscriber profile of the mobile subscriber database (not shown).

Next, a ring back tone service method using an SSP according to the present invention will be described with reference to FIGS. 3 to 5.

First, referring to FIG. 3, as described above, the home location register 160 pre-registers ringback tone service subscription information of the mobile communication subscriber and the ringback tone service exchanger 110 from the ringback tone service subscriber management device 180 in advance. Receive the routing information to the) to register / manage (s100).

When a predetermined caller attempts to make a telephone call to a called party (hereinafter referred to as a called subscriber) who has subscribed to a ringback tone service according to the present invention, the calling exchange 141 recognizes it through a base station (not shown) and then calls the called party. A location request invoke message is transmitted to the home location register 160 (S101). In this case, the message requesting the location inquiry for the called party includes caller information (ie, calling MDN: Mobile Directory Number) (eg, a telephone number) and information of called party (ie, called MDN) (eg, a phone number, etc.). ) Are included.

When the home location register 160 requests a location query for a predetermined called party from the calling exchange 141, a message for requesting incoming routing information to the called exchange 142 where the called party finally registers the location [MIN of the called party] (Mobile Identity Number) (e.g., phone number, etc.)] and the routing routing information (TLDN: Temporary Local Directory Number, TLDN) is a routing prefix and destination exchange that allows the originating exchange to route the call to the destination exchange. It consists of a Temporary Number to distinguish the incoming call in (s102, s103). Here, the destination exchange 142 performs a function in the existing mobile communication network.

And, the home location register 160 retrieves the profile of the called subscriber registered in the pre-registered subscriber database, if the called subscriber is a subscriber of the ringback tone service according to the present invention and the ringback tone service is set to an active state ( s104), including routing information (CRBT Prefix: Customized Ring Back Tone Prefix) to the ringback tone service exchanger 110, and destination subscriber information (called MDN) and incoming routing information (TLDN) received from the destination exchange 142. The message is transmitted to the originating exchange 141 in response to the request in step s101 (s105).

On the other hand, if the called party is confirmed not to be a subscriber of the ringback tone service according to the present invention, or if the called subscriber is identified as a subscriber of the ringback tone service according to the present invention, the ringback tone service is set to inactive state, The location register 160 performs a general operation of providing a message including only incoming routing information received from the destination exchange 142 to the originating exchange 141.

The originating exchange 141 analyzes the response message according to the location inquiry request and recognizes the information to route to the ringback tone service exchange 110 (that is, routing information to the ringback tone service exchange 110). It sends a caller information (originating MDN), routing information to the ringback tone service exchanger 110, called subscriber information (called MDN), and incoming routing information (TLDN) to request a call connection (IAM: Initial Address). Message) (s106).

Here, the message IAM requesting the call connection transmitted from the originating exchange 141 is transmitted to the ringback tone service exchange 110 through the gateway (130 of FIG. 1). At this time, the gateway 130 recognizes the routing information to the ringback tone service exchanger 110 included in the message relayed from the originating exchange 141 to relay the call to the ringback tone service exchange 110. .

The ringback tone service exchanger 110 recognizes the destination exchange 142 based on the incoming routing information (TLDN) included in the message (IAM) for the call connection received through the gateway 130, and then includes the message in the message. The routing information to the ring back tone service exchanger 110 is deleted, and a message (IAM) requesting a call connection including only caller information (originating MDN) and incoming routing information (TLDN) is transmitted to the called exchange 142 ( s107).

Here, a message IAM requesting for a call connection transmitted from the ringback tone service exchange 110 is transmitted to the destination exchange 142 through the gateway 130. At this time, the gateway 130 recognizes the incoming routing information (TLDN) included in the message relayed from the ringback tone service exchange 110 to relay the call to the destination exchange 142. The gateway 130 performs the same function as in the existing mobile communication network.

In addition, when the ring back tone service exchanger 110 transmits a call setup response message (ACM: Address Complete Message) for step s107 from the destination exchange 142 (s108), whether the basic ringback tone is transmitted from the destination exchange 142. Monitor (s109).

At this time, when transmission of the basic ringback tone is recognized from the destination exchange 142 within a preset time (s110), a message including caller information (calling MDN) and called subscriber information (called MDN) is transmitted to the sound source providing apparatus 120. (IAM) transmits a request for providing a sound source set by the called subscriber (s111). At this time, the sound source providing device 120 based on the caller information (calling MDN) and the called subscriber information (called MDN) included in the message (IAM) received from the ringback tone service exchange 110, the called subscriber to the caller After extracting the sound source set to be provided, the call setup response message (ACM) is transmitted to the ringback tone service exchanger 110 to set the call and then provide the corresponding sound source (s112).

Subsequently, the ringback tone service exchanger 110 transmits a message (ACM) for establishing a call with the sound source providing apparatus 120 to the originating exchange 141 in response to step s106 to transmit the call exchanger 141 and the sound source providing apparatus ( After setting the call between 120, the sound source transmitted from the sound source providing apparatus 120 is provided to the originating exchange 141 (s113, s114). At this time, the caller listens to the sound source set by the called subscriber in ringback tone.

On the other hand, while the ringback tone service exchanger 110 is providing a sound source to the caller, if a message (ANM: Answer Message) (hereinafter referred to as a called party response message) that the called subscriber has been sent from the called exchange 142 is transmitted. (s115), by releasing the call set to the sound source providing device 120 (REL: Release) (s116), by providing a sound source to the call exchanger 141 by cutting off the connection between the source exchange 141 and the sound source providing device 120 Stop and transmit the called party response message to the calling exchange 141 to support the call between the calling party and the called party (s117, s118).

Next, the operation process for the case that the basic ringback tone is not sent from the destination exchange 142 in the ringback tone service method according to the present invention will be described with reference to FIG. Since the operation of steps s200 to s209 shown in FIG. 4 is the same as the operation of steps s100 to s109 shown in FIG. 3, redundant descriptions thereof will be omitted.

As shown in FIG. 4, in the state of monitoring whether the basic ringback tone is transmitted from the destination exchange 142 in step s209, if it is recognized that the transmission of the basic ringback tone does not occur within a preset time (s210). In response to step S206, a message (ACM) for establishing a call with the destination exchange 142 is transmitted to the source exchange 141 to support a call between the source exchange 141 and the destination exchange 142 (s211, s212). . Here, when the basic ringback tone is not transmitted from the destination exchange 142, it is generally connected directly to the voice mailbox of the called subscriber.

Finally, in the ringback tone service method according to the present invention, a call release request message (REL: Release message) is received from the destination exchange 142 while providing a sound source to the source exchange 141 (strictly speaking, the caller). The operation of the case will be described with reference to FIG. 5 as follows. Since the operation of steps S300 to S314 shown in FIG. 5 is the same as the operation of steps S100 to S114 shown in FIG. 3, redundant descriptions thereof will be omitted.

As shown in FIG. 5, if a call release request message REL is received from the destination exchange 142 while providing a sound source to the originating exchange 141 in step s314 (s315), the sound source providing apparatus 120 and The call set to the originating exchange 141 is released (REL) to release all calls (s316 and s317). In this case, when a call release request message is received from the destination exchange 142, generally, when the called party's mobile communication terminal rings, the power is turned off due to lack of power of the terminal or There is a case where the mobile terminal is moved to a shaded area (frequency not reached area) while ringing a telephone.

As described above, it is natural that the ringback tone service system according to the present invention can use not only ISUP signaling but also inter-station relay signaling such as R2 and ISDN-PRI.

So far I looked at the center of the preferred embodiment for the present invention. However, it will be understood by those skilled in the art that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

According to the present invention, an SSP (i.e., ringback tone service exchange) component is added to an existing mobile communication network to change an operation profile of an exchange which is a component of the mobile communication network, and an operation profile of the exchange and home location registration period. Without changing the operation profile for the home location register only, there is an effect that it is possible to reduce the cost of changing the operation profile for the components of the mobile communication network for the ringback tone service.

1 is an exemplary view showing a procedure for a conventional ringback tone service method;

2 is a schematic configuration diagram of a ringback tone service system using an SSP according to the present invention;

3 is a first exemplary view showing a procedure for a ringback tone service method using an SSP according to the present invention;

4 is a second exemplary view showing a procedure for a ringback tone service method using an SSP according to the present invention;

5 is a third exemplary view showing a procedure for a ringback tone service method using an SSP according to the present invention.

Claims (11)

delete delete A method for providing a sound source set by a called subscriber as a substitute for a basic ringback tone using a ringback tone service exchanger, (a) registering, by a home location register, with or without subscription information on a ringback tone service of a mobile communication subscriber and routing information to a ringback tone service exchanger in an already provided subscriber database; (b) When a message for requesting the inquiry of a predetermined called party is transmitted from the calling exchange, the home location register receives the incoming routing information through communication with the called exchange corresponding to the called party, and then based on the subscriber database. As a result of confirming whether a ringback tone service is subscribed to the called party, if the called party is a subscriber to the ringback tone service and the ringback tone service is set to an active state, a ringback tone service exchanger for a call connection to the ringback tone service exchange Sending a response message including routing information, called party information, and incoming routing information to the calling exchange; (c) When a call connection is requested from the originating exchange, the ringback tone service exchange recognizes the called exchange based on the incoming routing information received in the call connection request, and transmits the calling party information and the incoming routing information to the called exchange. Setting up a call with a destination exchange corresponding to the call, and monitoring whether a basic ringback tone is transmitted from the destination exchange; And (d) When a basic ringback tone is sent from the destination exchange, the ringback tone service exchanger requests the sound source providing device to provide a sound source set by the called party, and sets the call exchange device with the sound source providing device. And after transmitting the message, providing the sound source transmitted from the sound source providing device to the originating exchange as a substitute for the basic ringback tone. The method of claim 3, wherein step (d) If the basic ringback tone is not sent from the destination exchange, the ringback tone service exchange transmits a message for establishing a call with the destination exchange to the originating exchange to support the call between the originating exchange and the incoming exchange period. Ringback tone service method using. The method of claim 3, (e) While providing the sound source transmitted from the sound source providing device to the caller, if a message indicating the response of the called party is transmitted from the called exchange, the ringback tone service exchange releases the call set as the sound source providing device to provide the sound source to the calling exchange. After stopping, the ringback tone service switch using a ringback tone service exchange, characterized in that further comprising the step of supporting the call of the call exchanger and the incoming exchange period by transmitting a message informing the response of the called party to the calling exchange. The method of claim 3, (e) If a message requesting call release from the destination exchange is transmitted to the caller while providing a sound source delivered from the sound source providing device, the ringback tone service exchange releases the call set as the sound source providing device and the originating exchange to the originating exchange. Ringback tone service method using a ringback tone service exchange, characterized in that further comprising the step of stopping the provision of the sound source. delete delete If the subscriber registers the presence information on the ringback tone service of the mobile communication subscriber and the routing information to the ringback tone service exchanger in the pre-registered subscriber database, and receives a message for requesting the location of a predetermined called party from the originating exchange, After receiving the incoming routing information through communication with the corresponding destination exchange, if the called party subscribes to the ringback tone service and the called party subscribes to the ringback tone service and the ringback tone service is set to the active state, A home location register for sending a response message including routing information, called party information, and incoming routing information to a ringback tone service exchange for a call connection to a ringback tone service exchange; If the routing information for the call connection to the ringback tone service exchange is recognized by analyzing the response message received from the home location register, requesting the call connection to the ringback tone service exchange includes caller information, called party information, and incoming routing information. An originating exchange that carries a message; When the call is established with the destination exchange based on the message received from the originating exchange, if the base ringback tone is recognized from the destination exchange and the base ringback tone is recognized, the sound source providing device determines the A ringback tone service exchanger for requesting provision, transmitting a message for setting up a call with a sound source providing apparatus to an originating exchange, and providing the sound source delivered from the sound source providing apparatus to a corresponding originating exchange as a substitute sound of a basic ringback tone; And Register / manage information about subscribers who have subscribed to the music service, type of sound source set by the subscriber, and information about the caller who will receive the set sound as a substitute for the basic ringback tone. And a sound source providing device for extracting and transmitting a sound source set to be provided to a predetermined caller by the called party when the provision of the sound source is set by the called party. 10. The system of claim 9, wherein the ringback tone service exchanger While providing sound source to originating exchange, When a message notifying the called party's response is sent from the called exchange, the call is set to the sound source providing device to stop providing the sound source to the calling exchange, and then the sending exchange sends a message notifying the called party's response to the calling exchange. Support currency during the exchange period, When a message requesting a call release from the destination exchange is transmitted, the ringback tone service system using the ringback tone service exchange, characterized in that the sound source providing device and the source exchange to release the call to stop providing the source to the source exchange. 10. The system of claim 9, wherein the ringback tone service exchanger If the basic ringback tone is not sent from the destination exchange, the ringback tone service using the ringback tone service exchange, by transmitting a message for setting up a call with the destination exchange to the originating exchange, supports the call between the originating exchange and the incoming exchange period. system.