KR20050002267A - An IP telephony service system for providing ring-back tone selected by terminated call user and a method thereof - Google Patents

Abstract

PURPOSE: An Internet telephone service system and a method for supplying a call connection sound designated by a receiver are provided to transmit originator speech channel information and receiver speech channel information to a receiver terminal and an originator terminal, respectively, if a call accept message of a receiver and the receiver speech channel information are transmitted, thereby making a call. CONSTITUTION: A call connection sound service subscriber DB(21) stores a call connection sound designated by a receiver and registration information on the receiver. A call connection sound control server(200) receives originator speech channel information and the receiver registration information from an originator terminal, sends a call request to a receiver terminal by using a virtual speech channel, and receives a call accept message and receiver speech channel information. A call connection sound generator(220) receives the originator speech channel information and the call connection sound information, and transmits the designated call connection sound to an originator.

Description

An IP telephony service system for providing ring-back tone selected by terminated call user and a method

The present invention relates to an Internet telephony service system and method for giving a caller a ring back tone (call waiting tone or ringback tone) designated by a receiver. More specifically, the present invention relates to a system and method for preventing a collision between a call ring tone designated by a receiver and a call ring tone of a receiver terminal, and preventing a call interruption due to the call ring tone designated by the caller.

Voice over IP (VoIP) is a term that refers to IP telephony technology for a set of facilities that deliver voice information using the Internet Protocol (IP). In general, this means that voice information is sent in digital form within discrete packets, rather than traditional protocols based on circuit switching, such as PSTN, a public switched telephone network. The main advantage of VoIP and Internet telephony technology is that it integrates telephone service by utilizing existing IP network so that telephone users can receive long distance and international phone service in internet and intranet environment with only local call charge.

VoIP encourages the use of ITU-T H.323, a standard for transporting voice and video over IP over the public Internet or on an intranet within an enterprise. Through VoIP forums, Cisco, Vocaltech, 3Com, and NetSpeak It was done by the equipment manufacturers.

1 is a schematic diagram illustrating various examples in which a VoIP telephony service is implemented.

The VoIP service may be equipped with a VoIP application program and an interface in a typical computer terminal 10, 11, or may be used by using an Internet phone made exclusively for using the VoIP service. The VoIP service may be configured in the form of packet communication on the Internet to perform voice communication with a counterpart terminal, and other types of communication devices 14 and 16 through the PSTN 13 or the mobile communication network using the gateways 12 and 15. It can also communicate with.

On the other hand, when a caller requests a call from a wired telephone network using CDMA mobile communication or a PSTN, so-called two-ring and coloring service, in which music or a comment specified by a receiver's setting, in addition to a normal call connection sound, is commercially successful. Such a coloring service is configured to check whether the incoming telephone number is subscribed to the ring back tone service and, when subscribed, transmits music registered to the server of the IP company.

In such a normal wired / wireless ring back tone service, since the portion for managing the voice channel is the central switch, the voice channel is formed between the terminal and the central switch. In the case of the ring back tone, a voice channel is initially formed between the caller terminal and the ring back tone server in the central switch, and when the receiver accepts the call, the ring back tone can be easily provided by modifying the channel to the receiver terminal.

However, in the case of VoIP, voice channel information is exchanged between terminals, and a voice channel is directly formed between the terminals. In this case, the formation of the voice channel means that the information of the voice channel has been exchanged, and there is no physical connection as in the case of ordinary wired or wireless service. This is due to the fact that VoIP uses data networks. In addition, since the configuration of receiving and processing all voices in the central server places an excessive load on the server side, the processing of voice packets in the VoIP is preferably performed directly between the terminals.

Therefore, the Internet telephony ring tone service provided in the prior art has a ring tone server having a separate sound source, and the calling terminal forms a call channel in both the ring tone server and the receiver terminal.

However, when the caller's voice channel is exchanged in advance, both the RBT server and the receiver terminal may transmit the RBT. The voice data from these two different sources may collide with each other, causing strange sounds or no sound at all. This is because voice data in VoIP processes data based on the sequence number using the RTP protocol. Thus, without the mixing process, the voice data transmitted from various sources may not be implemented as a proper voice.

In order to solve this problem, a call channel is first formed with a ring back tone server, and the call channel information of the caller terminal may be transmitted to the receiver terminal with a delay. However, in this prior art, the receiver terminal has a problem in that a call delay is increased compared to a general call connection without a third device.

The present invention to solve the above problems, a system for providing a variety of ring tones to suit the user's taste and personality without the collision of voice data from the receiver terminal and the ring tone specified by the receiver in the Internet phone without a call delay And methods.

1 is a schematic diagram illustrating various examples in which a VoIP telephony service is implemented.

2 is a schematic diagram illustrating a ring back tone service system according to an embodiment of the present invention.

3 is a block diagram illustrating a configuration of a system for providing a ring back tone according to an embodiment of the present invention.

4 is a signal flow diagram illustrating a signal flow in the ring back tone service method according to an embodiment of the present invention.

In order to achieve the above object of the present invention, a system for providing a ring back tone according to an aspect of the present invention includes a ring back tone service subscriber database storing a ring back tone designated by a receiver and registration information of the receiver; A ring back tone control server that receives the caller channel information and the receiver registration information from the caller terminal, performs a call request to the receiver terminal using a virtual call channel, and receives a call acceptance message and receiver call channel information from the receiver terminal; And a call ring tone generator configured to receive caller call channel information and call ring tone information from the call ring tone control server and transmit a call ring tone designated by the receiver to the caller.

Here, when the call acceptance message of the receiver arrives, the call connection sound control server transmits the receiver call channel information to the caller terminal and transmits the caller call channel information to the receiver terminal.

In addition, the method for providing a ring back tone according to an aspect of the present invention includes the steps of: transmitting, by a caller terminal, receiver information and caller call channel information to a ring back tone control server; Requesting, by the ring back tone control server, a call connection to a receiver corresponding to the receiver information by using a meaningless virtual call channel; Retrieving the ring back tone service information corresponding to the receiver information into a service subscriber database by the ring back tone control server and transmitting the ring back tone service information to the ring back tone generator together with the caller call channel information; And transmitting, by the call ring tone generator, the call ring tone designated by the receiver to the caller using the caller call channel information and the call ring tone service information.

The method for providing a ring back tone includes: transmitting, by a receiver terminal, a call acceptance message including receiver call channel information to the ring back tone control server in response to a call request from the ring back tone control server; And when the call connection sound control server receives the call acceptance message, transmitting the receiver call channel information to the caller terminal and transmitting the caller call channel information to the receiver terminal.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

Now, a method for providing a ring back tone service according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic diagram illustrating a ring back tone service system according to an embodiment of the present invention.

The ring back tone service system according to the embodiment of the present invention includes a caller terminal 100, a receiver terminal 300, a call back tone control server 200, a service subscriber DB 210, and a ring back tone generator 220.

The caller terminal 100 receives the registration information of the receiver from the user and performs a call connection. The receiver terminal 300 receives a request for connection of the call and informs the receiver of the request by using a ringtone. Call connection control server 300 mediates the connection of the call between the caller terminal 100 and the receiver terminal (300).

Here, the caller terminal 100 or the receiver terminal 300, as well as a simple terminal device, as shown in Figure 1, a personal terminal directly connected to the caller or the receiver and a conventional public switched telephone network (PSTN) or mobile The concept includes a gateway that is connected to a caller or a receiver through a telephone network.

In order to add the ring back tone service according to the embodiment of the present invention, in addition to the above components, the ring back tone generator 220 includes a separate device. The ring back tone generator 220 operates in conjunction with the caller terminal 100, the receiver terminal 300, and the call connection control server 200, and has a function of making and transmitting a ring back tone to the caller terminal.

The service subscriber DB 210 stores a receiver number, subscription information of the ring back tone supplementary service, and information on a sound source.

The two-way call channel is logically the caller terminal 100 once the call channel information of the receiver terminal 300 ('call channel information' in the Internet telephony service is composed of the Internet address, port information, and codec type and setting values). The receiver terminal 300 is formed when the call channel information of the caller terminal 100 is known.

That is, when both the caller terminal and the receiver terminal know a pair of call channel information consisting of the call channel information of the caller terminal 100 and the call channel information of the receiver terminal 300, both parties can make a call between two parties The call channel is said to be established. If this condition is not satisfied, no call channel is formed, or a one-way call channel in a receive only state or a send only state is formed. For example, if the caller terminal does not know the call channel information of the receiver terminal, but the receiver terminal knows the call channel information of the caller terminal, there is no other party to send from the caller terminal but can receive a message from an unspecified party It has a one-way call channel in a dedicated state, and the receiver terminal has a one-way call channel in a transmission only state that can transmit a message to the caller terminal but cannot receive any message from the receiver terminal.

3 is a block diagram illustrating a configuration of a system for providing a ring back tone according to an embodiment of the present invention.

The call connection control server 200 includes a caller message processing interface 201, a receiver message processing interface 202, a service subscriber 204, a call connection sound generator control unit 205, and a control unit 203. In addition, the ring back tone generator 220 includes a message processing interface 221, a sound source database 222, and a voice codec converter 223.

The service subscriber management unit 204 performs a function of generating, storing, changing, acquiring, and deleting information necessary for the use of the ring back tone service and the sound source type of the ring back tone or other ring back tone service in response to the subscriber's request. The information and the ring back tone information are retrieved from the service subscriber database 210. In addition, it determines whether the ring back tone service according to the recipient number received through the caller message processing interface 201, retrieves the sound source information corresponding to the ring back tone specified by the receiver from the service subscriber database 210, and the sound source to the ring back tone generator Send the information.

The call connection sound generator 220 obtains a sound source designated by the receiver from the sound source DB in which the sound source is stored using the sound source information message and the receiver registration information of the call connection sound generator control unit 205 and sends the caller through the voice codec converter 223. Send to the terminal. Here, the call channel information of the caller terminal is obtained through the caller message processing interface 201.

Herein, the control unit 203 uses the caller terminal call channel information obtained through the caller message processing interface 201 and the caller call channel information obtained through the receiver message processing interface 202. It will control the operation of.

In more detail, when the subscription to the ring back tone service is confirmed from the service subscriber database 210, the control unit 203 requests the call connection using a meaningless virtual call channel to the receiver terminal. At the same time, the RBT generator control unit 205 transmits caller information and sound source information to the RBT generator 220 to transmit the RBT.

Subsequently, when the control unit 203 obtains the receiver call channel information from the receiver terminal and receives the call acceptance message, the controller 203 transmits the receiver call channel information included therein to the caller terminal and at the same time the call including the caller call channel information to the receiver. Send a channel change message. At this time, the ring back tone generator control unit 205 controls the ring back tone generator to stop the ring back tone generation.

Hereinafter, the signal flow will be described in detail in the embodiment of the present invention.

4 is a signal flow diagram illustrating a signal flow in the ring back tone service method according to an embodiment of the present invention.

In step S100, the caller terminal 100 transmits a call connection request message including information of the caller call channel and the receiver registration information to the server 200 for call connection sound control. Here, the server 200 for call connection sound control using the information of the caller call channel forms a reception-only one-way call channel.

In step S110, the ring back tone control server 200 determines who the receiver is from the recipient registration information received from the caller terminal 100, and contacts the database 210 with the subscriber information to subscribe to the ring back tone service. Check whether or not.

In step S120, when the receiver subscribes to the RBT service, the service subscriber database 210 is connected to the RBT subscription information of the receiver (type of the RBT sound source and other information necessary for the RBT service and the RBT generator 220 call. The message including the channel information is transmitted to the ring back tone control server 200.

In step S131, the ring back tone control server 200 transmits a message in which the caller channel information is changed from the caller terminal message to the virtual call channel information that is not actually made of the call. In this case, the virtual call channel information is information of a call channel which is meaningless, and the caller terminal 100 is not in a state capable of receiving voice data from the receiver terminal.

In step S132, the ring back tone control server 200 transmits the call ring tone generator 220 including the caller call channel information and the information required for the ring back tone service, and the ring back tone generator 220 in step 140. By using the information to establish a transmission channel to the caller terminal transmits the ring back tone.

In step 150, the receiver's terminal rings, and the receiver terminal 300 receiving the call request by step 131 includes a call connection information to the ring back tone control server 200 including its call channel information. By transmitting, the receiver terminal informs that the call is in progress, and in step S160, the call connection progress message is transmitted to the caller terminal. Here, the steps S150 and S160 may be omitted, and in step S160, the call connection sound control server 200 may notify the caller terminal of the call progress through a one-way transmission dedicated channel.

In step S170, the call connection acceptance message including the information on the receiver call channel is transmitted to the call connection sound control server 200.

The ring back tone control server 200 receiving the call connection acceptance message transmits the received call channel information to the caller terminal 100 at the same time (S182) and at the same time the call channel change message including the caller call channel information to the receiver terminal ( 300). In addition, the call connection sound generator 220 is instructed to stop transmitting the call connection sound (S181).

By the above-described steps, the caller terminal 100 obtains the receiver call channel information, and the receiver terminal 300 obtains the caller call channel information to perform a voice call (S190).

By the above-described configuration, while transmitting the call ring tone designated by the receiver to the caller terminal 100, the call ring tone control server 200 obtains the call channel information of the receiver terminal by using the virtual call channel information, and the receiver terminal. When the phone 300 accepts the call, the caller terminal 100 and the receiver terminal 300 transmit caller call channel information and callee terminal call channel information, respectively, to enable a voice call.

Therefore, a collision does not occur between the voice data of the receiver terminal and the voice data of the ring back tone control server. In addition, if there is a call transfer acceptance, one process of transmitting a call transfer acceptance message including the receiver call channel information to the caller terminal and a call channel change message including the caller call channel information to the receiver terminal are already transmitted. Since only one process can form a bidirectional call channel, the problem of call delay is significantly reduced.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

According to the above-described configuration of the present invention, it is possible to solve the problem of the ring back tone service that occurs in the Internet telephone according to the characteristics of data communication, and to implement the ring back tone service suitable for the taste and personality of the individual to the Internet telephone service while maintaining the call quality. have.

In addition, the present invention is not only a technology that can be applied to the actual configuration of the Internet phone service, but also can be applied to the data-driven next-generation network that appears instead of the conventional PSTN without changing the content. In addition, it is possible to immediately provide ringtone service to subscribers of Internet telephone service to be developed in the future.

Claims (7)

For systems that provide a ringback tone specified by the recipient on an Internet phone: A ring back tone service subscriber database storing a ring back tone designated by the receiver and registration information of the receiver; A ring back tone control server that receives caller call channel information and callee registration information from a caller terminal, performs a call request to the callee terminal using a virtual call channel, and receives a call acceptance message and callee call channel information from the callee terminal; A system for providing a ring back tone comprising a ring back tone generator for receiving a caller call channel information and a ring back tone information from the ring back tone control server and transmitting a ring back tone designated by a receiver to a caller. The method of claim 1 wherein: The call ring tone control server, when the call acceptance message of the receiver arrives, the call ring tone providing system to the caller terminal, and transmits the caller call channel to the receiver terminal. The method of claim 2 wherein: The ring back tone control server includes: a caller message processing interface unit for receiving an information message from a caller; A receiver message processing interface for receiving an information message from the receiver; And a service subscriber management unit for calling the RBT service information from the RBT service subscriber database using the caller message and a RBT generator control unit for controlling the RBT generator using the RBT information and the caller information. System for providing ring back tone. The method of claim 2, The ring back tone generator includes a message processing interface for receiving a message from a ring back tone control server; A sound source database in which sound sources are stored; Method for providing a ring back tone comprising a voice codec converter. A method for providing a ring back tone specified by a recipient in an internet telephone: Transmitting, by the caller terminal, the receiver information and the caller channel information to the call connection tone control server; Requesting, by the ring back tone control server, a call connection to a receiver corresponding to the receiver information by using a meaningless virtual call channel; Retrieving the ring back tone service information corresponding to the receiver information into a service subscriber database by the ring back tone control server and transmitting the ring back tone service information to the ring back tone generator together with the caller call channel information; And And the call ring tone generator transmitting the ring back tone designated by the receiver to a caller using the caller call channel information and the call back tone service information. The method of claim 5, wherein In response to a call request from the ring back tone control server, a receiver terminal transmitting a call acceptance message including receiver call channel information to the ring back tone control server; And And when the call connection tone control server receives the call acceptance message, transmitting the caller call channel information to the caller terminal and transmitting the caller call channel information to the callee terminal. The method of claim 6, And receiving the call acceptance message, wherein the ring back tone control server transmits a ring back tone stop message to the call ring tone generator.