KR100458195B1 - Method for collect call service based on VoIP technology and System thereof - Google Patents

Abstract

The present invention relates to a collect call service method, in which a receiver does not have to pay a call fee between a caller and a receiver in order to allow a receiver to pay a uniform fee according to the location and / or type of a receiver. The present invention relates to a VoIP-based collect call service method for connecting a VoIP network in a certain section and a communication network in a certain section in which a receiver pays a usage fee. According to a preferred embodiment of the present invention, the first link is generated in response to a collect call call request received through a VoIP network and a collect call exchange period is set up, and when the first link is established, the collect A call exchanger calls a called party's terminal to establish a second link between the collect call exchanger and the called party's terminal, and upon receiving a collect call reception request from the called party's terminal, connects a voice call between the calling party's terminal and the called party's terminal, VoIP for initiating charging for the second link and releasing the voice call between the calling terminal and the called terminal when receiving a normal call termination request from the calling terminal or the called terminal. Provided are a method and a system for providing a collect call service using the system.

Description

Method for collect call service based on VoIP technology and System

The present invention relates to a collect call service method and a system thereof. In more detail, in the present invention, in order for the receiver to pay a uniform usage fee according to the location of the receiving terminal and / or the type of the receiving terminal, a certain period in which the receiver does not have to pay for the call between the sender and the receiver. The present invention relates to a VoIP-based collect call service method and system for connecting a VoIP network and a communication network in which a receiver pays a fee.

In the past, communication services merely provided means as a simple communication medium, but current communication services continue to evolve as a means for providing various high quality services. One of the goals of current telecommunications services is for operators to efficiently provide new phone services at low cost to meet the needs of their subscribers, which is essential to gain a comparative advantage over other providers. The Internet, which enables this service provider's goal, is becoming a part of life as the number of users grows rapidly, and the linkage between PSTN and IP networks has been linked to both fixed-line operators, wireless operators, ISPs, equipment manufacturers, and additional information providers. Provides a variety of opportunities.

Efforts to provide existing telephone services and supplementary services on the Internet, which were provided through the telephone network, are being actively carried out through the IETF, ITU, and ETSI standardization organizations. The IETF proposed standards such as session initiation protocol (SIP), session description protocol (SDP), media gateway control protocol (MEGACO), and signaling transport (SIGTRAN) to provide telephony and supplementary services on the Internet. ITU-T has studied H.323 since the early 1990s. H323 is a standard for transmitting / receiving voice / data / video between terminals in a packet network. H.323 defines four important elements of terminals, gateways, gatekeepers, and multipoint control units (MCUs) to communicate over network-based networks. H.323 currently supports TCP and UDP. It was established until H./323 v3. ETSI (European Telecommunications Standards Institute) meets the needs of a common solution called voice over network (VoN), and develops and standardizes the technology used in consideration of the issues occurring when interworking with a switched circuit network (SCN) and the Internet network. TPHON (Telecommunications and Internet Protocol Harmonization Over Networks) was established. Of the above-mentioned standards for VoIP, H.323 is the most widely used. 1A is a schematic diagram illustrating a VoIP network according to the H.323 standard. The ordinary telephone 10a can request a call to the receiving telephone 13 through the registered calling gateway 11a, and the VoIP stand-alone telephone 10b can receive the calling telephone 13 without going through a separate gateway. You can request a call with). Source / receive gateways (11a, 11b) is a node that acts as a gateway to enter other networks, matching the network and other networks according to the H.323 standard and data signals and control from one network It converts the signal into a format that can be transmitted through the other network and outputs it. The gatekeeper 12 is one of the entities of a network conforming to the H.323 standard, and is an end point of a network conforming to the H.323 standard, for example, a gateway, a user terminal (PC, VoIP stand-alone). Telephone) and MCU (Multipoint Control Unit (not shown)) is a device that controls, manages, and registers by grouping into one control area defined as a certain area (Zone). Although not a necessary component for networks conforming to the H.323 standard, the gatekeeper 12 can perform key functions such as address translation, call admission, bandwidth control, and additional functions such as call control, billing, and statistics.

As the billing method for the voice call service provided by the VoIP system, the most suitable method disclosed so far is a debit method by a prepaid card. Prepaid cards have various forms of exchange value, including cash, points, miles and coupons. Prepaid cards are suitable as a billing method for VoIP systems because billing is not easy due to the variety of users (callers) and equipment (PCs, stand-alone phones, etc.) unlike public telephone networks or mobile communication networks. However, despite the low cost of using the voice call service by the VoIP system, the number of users has not increased due to the fact that the prepaid card can only be used in advance. In addition, there is a method of paying post-pay after contracting with a separate service provider that provides a VoIP voice call system.

Unlike voice call system by VoIP system, the collect call service is increasing in number of users as a service of existing public telephone network. Toll-free services, which have begun to be serviced by public telephone network companies, which are gradually decreasing due to the development of mobile communication, are now being served by mobile operators. 1B is a schematic diagram illustrating a communication system in which toll service is performed. The caller requests a call by inputting a toll-free service identification number and a recipient number together to his or her terminals 20a and 20b, and when the receiver allows the reception, all call charges are charged to the receiver. For example, when the caller 20b makes a call to the receiver 25a, which is a public telephone network subscriber, using the cellular phone, the receiver bears both the wireless network usage fee and the public telephone network usage fee. Therefore, the existing toll-free service has a problem that the fee varies not only in the form of the receiver terminal but also in the form of the caller terminal.

As described above, the voice call service by the existing VoIP system has a problem that can be used only when the caller purchases a prepaid card in advance, and the toll service is not only the type of the receiver terminal, but also the fee varies depending on the type of the caller terminal. There is a problem.

In order to solve this problem, an object of the present invention is to enable a caller to use a voice call service by the VoIP system without having to purchase a prepaid card in advance, thereby reducing the charge of the receiver VoIP based collect call service method And to provide the system.

Another object of the present invention is to allow a receiver to pay a uniform fee only by the location of the receiving terminal and / or the type of the receiving terminal irrespective of the type and location of the originating terminal, thereby reducing the burden of the receiver of the VoIP-based collect The present invention provides a call service method and a system thereof.

1A is a schematic diagram illustrating a VoIP network according to a conventional H.323 standard.

1B is a schematic diagram illustrating a communication system in which a toll free service is performed;

2 is an exemplary view schematically illustrating a VoIP based collect call service method according to the present invention.

3 is a system configuration diagram for providing a VoIP-based collect call service according to the present invention.

4 is a flowchart schematically illustrating a VoIP based collect call service method according to the present invention.

5 is a flowchart schematically illustrating a signal transmission and reception process in a VoIP based collect call service system according to the present invention.

6 is a flowchart schematically illustrating a signal transmission and reception process through a collect call proxy server.

7 is a flowchart schematically illustrating a signal transmission and reception process through a collect call proxy server and a gatekeeper;

In order to achieve the above object, according to a preferred embodiment of the present invention, in the method of providing a collect call service using a VoIP system, formed between the calling gateway coupled to the calling party terminal and the receiving gateway coupled to the collect call exchanger. Generating a first call exchange period with a receiving gateway in response to a collect call call request received through a VoIP network, wherein the caller terminal receives information necessary for access to a known receiving gateway in advance; Direct access to the receiving gateway by using the first link is established, the collect call exchange calling the receiver terminal to establish a second link between the collect call exchange and the receiver terminal; When the collect call reception request is received from the caller terminal, Connecting a voice call between the receiver terminal and initiating charging for the second link; and when a normal call termination request is received from the caller terminal or the receiver terminal, release the voice call between the caller terminal and the receiver terminal. And, the collect call service providing method using a VoIP system comprising the step of terminating the charge for the second link is provided.

According to another preferred embodiment of the present invention, in a method for providing a collect call service using a VoIP system composed of a plurality of gateways, a collect call call received from a caller terminal that knows connection information to a collect call service providing system using VoIP Performing authentication on the caller terminal in response to the request, acquiring a registration / admission / status (RAS) approval for the collect call and obtaining access information to a receiving gateway corresponding to the callee terminal; Acquiring a RAS approval and access information to the receiving gateway, establishing a connection between the calling gateway and the receiving gateway by transmitting a collect call call request to the receiving gateway, and receiving the received call. Call with the receiving gateway in response to a call request Generating a first link during a direct call exchange period; when the first link is established, the collect call exchange calls a receiver terminal to establish a second link between the collect call exchange and the receiver terminal; When a collect call reception request is received from a terminal, connecting a voice call between the caller terminal and the receiver terminal, initiating charging for the second link, and receiving a normal call termination request from the caller terminal or the receiver terminal. When the voice call between the caller terminal and the receiver terminal is released, and the charging for the second link is terminated, a method for providing a collect call service using a VoIP system is provided. According to the VoIP system for providing a collect call service, a call coupled to the caller terminal A receiving gateway coupled to a new gateway and a VoIP network and connecting a voice call with the calling terminal in response to a collect call call request received from the calling terminal through the VoIP network, wherein the calling terminal is known in advance; Direct access to the receiving gateway using information necessary for access to the receiving gateway, and coupled with the called party's terminal through a public telephone network or a mobile communication network, and corresponds to a collect call call request received from the receiving gateway. Establish a first link with the receiving gateway, establish a second link with the called terminal, connect a voice call in response to a collect call reception request received from the receiver terminal, and charge for the second link VoIP based collect call comprising a collect call exchanger that performs A service system is provided. Here, the VoIP-based collect call service system performs authentication on the caller terminal in response to the collect call call request received from the caller terminal, and receives a RAS approval for the collect call and a receiver gateway corresponding to the callee terminal. The apparatus may further include a collect call proxy server that acquires access information of the at least one and transmits the collect call call request to the receiving gateway using the obtained information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the description of the present invention with reference to the embodiments is intended to facilitate understanding of the present invention by those skilled in the art to which the present invention pertains, and it is described in the accompanying drawings and the detailed description of the present invention. It is not limited to the Example. In the present specification, for convenience of description, a description will be given mainly on a case where the VoIP system is implemented according to the H.323 standard among VoIP systems that can be implemented according to various standards. However, this does not limit the system to which the present invention is applied to a system according to the H.323 standard, and those skilled in the art, as well as H.323, session initiation protocol (SIP), It is apparent that a standard such as MGCP (Media Gateway Control Protocol) can be implemented to have the same purpose and effect as the embodiments described herein.

2 is an exemplary view schematically illustrating a VoIP based collect call service method according to the present invention.

Referring to FIG. 2, a collect call according to the present invention is located between a VoIP network located between a calling party terminal and a receiving gateway operating as a PSTN access node, and located between a called party terminal and a receiving gateway operating as a VoIP network access node. Serviced through PSTN network / mobile communication network. The VoIP network is composed of a calling party terminal, a calling gateway, and a receiving gateway, and a gatekeeper and a collect call proxy server may be additionally included. The PSTN network consists of a collect call exchanger and a general exchange, and the mobile communication network consists of a general exchange and a base station.

The difference between the collect call service and the conventional collect call service according to the present invention is that the called party pays only the usage fee for a certain toll-paid call interval according to the type and / or location of the called party's terminal. This is because the caller terminal according to the present invention is capable of transmitting a call request and making a voice call through the VoIP network. For example, in the conventional collect call service, when the caller terminal is a mobile terminal and the receiver terminal is a general telephone connected to a public telephone network, the receiver is not only a public telephone network fee but also a mobile communication network fee and a network access fee. Including collect call charges. In another example, when a caller requests a collect call from a foreign telephone to a public telephone, the called party uses a collect call that includes all telephone charges in the country where the caller is located, inter-national network charges, and telephone charges in the country where the called party is located. You must pay a fee. However, according to the present invention, even if the caller requests a collect call, since the caller and the receiver do not bear separate charges for the VoIP network, the use charges borne by the called party are reduced. For example, if the collect call exchanger is installed in Seoul, if the receiver terminal is a regular telephone located in downtown Seoul, the receiver pays the downtown fee as a toll-free fee. If the phone is located, the receiver pays the toll fee at the toll-free rate. Exceptionally, in the case of a caller terminal connected to a VoIP gateway of an affiliated carrier among wired / wireless telephones connected to a public telephone network, the caller or called party bears the call path connected to the VoIP gateway of the affiliated carrier. Of course, who will be charged depends on the policy of the collect call service provider.

In order to reduce these costs, the caller terminal must be able to access the VoIP network, and the collect call call request received from the caller terminal coupled to the VoIP network can be distinguished from the collect call call request requested through a public telephone network or a mobile communication network. You need a collect call exchanger that can handle it. In the present invention, the type of caller terminal accessible to the VoIP network includes (1) a personal computer (must have a headset for voice call) connected to the IP network, and (2) a gateway module implemented in software / hardware. VoIP stand-alone telephones, and (3) telephones connected to a public telephone network, which can be connected to a VoIP gateway of a predetermined carrier. Hereinafter, a system and method for providing a VoIP based collect call service according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a system configuration diagram for providing a VoIP-based collect call service according to the present invention.

Referring to FIG. 3, the VoIP-based collect call service system according to the present invention includes a calling party terminal, a calling gateway, a receiving gateway, a collect call exchanger, and a called party terminal. Additionally, the VoIP based collect call service system may further include a gatekeeper (not shown) and a collect call proxy server 160. Some caller terminals, calling gateways, and receiving gateways are combined via an IP network that supports the VoIP standard (hereinafter abbreviated to VoIP network for convenience of explanation), and the collect call exchanger and the receiver terminal are public telephone / mobile networks. (Hereinafter referred to collectively as PSTN network for convenience of explanation). In addition, in the present invention, the gateway refers to a gateway, that is, a node for connecting to different networks, and is used to describe an embodiment of the present invention implemented according to the H.323 standard. Therefore, in the case of a VoIP network conforming to the H.323 standard and other standards, it can be easily understood by those skilled in the art that the gateway according to H.323 can be replaced with a corresponding component. will be.

The caller terminal comprises a personal computer 100, a VoIP stand-alone telephone 110, and a regular telephone 150 connected to a VoIP gateway via a public telephone / mobile network. The originating gateway can exist in various forms. In the case of the personal computer 100, a caller may be connected and used through the personal computer 100 by being included in the personal computer 100 in a software / hardware-implemented module form or included in a separate server connected to the VoIP network. . In the case of the VoIP stand-alone telephone 110, a separate module that may be included inside the VoIP stand-alone telephone 110 in a software / hardware implemented module form or a plurality of VoIP stand-alone telephones 110 may be combined. May exist as a gateway 130b. In the case of the general telephone 150 connected to the VoIP gateway via a public telephone network / mobile network, the calling gateway 130c is coupled to the exchange. The collect call request generated by the calling terminal 100, 110, 150 is present. Includes information for identifying the originating gateway 130b or 130c or the receiving gateway 130a as the collect call and the receiver terminal number. The collect call call request may further include connection information of the receiving gateway 130a for allowing the calling gateway 130b and 130c to directly transmit the collect call call request to the receiving gateway 130a. When the VoIP collect call service system according to the present invention includes a gatekeeper for performing call authentication (RAS) and gateway assignment or includes a collect call proxy server, the gateway connection information of the receiving side or the gatekeeper / collect call proxy server connection It may include any one of the information.

The receiving gateway 130a is coupled with the calling gateways 130a and 130b through the VoIP network and is electrically coupled with the collect call exchanger. The receiving gateway 130a establishes a path according to the H.323 standard with the calling gateway in response to the collect call call request received from the calling terminal 100, 110, 150 through the VoIP network, and performs voice communication with the calling terminal. Enable the call. And, it notifies the collect call exchange that the collect call request requested through the VoIP network, so that the collect call exchange can use the charge calculation.

In the preferred embodiment according to the present invention, since the billing is only performed for the PSTN link established between the collect call exchanger and the receiver terminal, the billing gateway is different from the conventional VoIP system operating method. Access information for the public. In a conventional VoIP system, when access information about a calling party or a receiving gateway is disclosed, hacking calls for free calls frequently occur. In order to prevent this, in a conventional VoIP system, access information for a gateway is mainly managed by a gatekeeper, and a user cannot know this explicitly. Therefore, a caller already having a gateway to use another VoIP system can directly connect to the receiving gateway according to the present invention through the disclosed receiving gateway information. In another embodiment, if a receiving gateway is installed in each region and a component for VoIP network management, such as a gatekeeper or a collect call proxy server, is included in the VoIP system, as described above, the gateway to the gatekeeper or collect call proxy server may be used. Access information may also be disclosed.

The collect call exchanger 140 is electrically coupled with the receiving gateway 130a and coupled with the called party terminal 120 through the PSTN network. The collect call exchanger 140 establishes a PSTN link with the receiving gateway and the called party terminal in response to the collect call call request received from the receiving gateway, and corresponds to the collect call receiving request received from the called terminal 120. To connect the voice call between the sender terminal and the receiver terminal. When the voice call is connected between the caller terminal and the receiver terminal, the charge for calculating the usage fee is performed. In a preferred embodiment according to the present invention, only the usage fee by the PSTN link established between the collect call exchanger and the receiver terminal is calculated as the toll fee, and the toll fee is calculated by the product of the hourly rate and the total talk time. It is preferable. However, in addition to the toll fee calculation method described above, various charge calculation methods are possible according to the policy of the communication operator operating the collect call exchanger 140. In this case, the billing target is the collect call exchanger 140 and the receiver terminal 120. Limited to PSTN networks.

Collect call proxy server 160 in the voice call between the caller terminal and the receiver terminal according to the present invention, the business logic according to the present invention in various heterogeneous networks (PSTN network, VoIP network, caller / receiver burden PSTN network) It plays a role to apply. Specifically, the collect call proxy server 160 has a network routing function for relaying connections to toll-free service networks and VoIP networks of various network operators according to the number requested by the caller, call statistics per caller, and caller identification service (CID). It performs call statistics / additional service function for providing additional services, OAM (Operation, Administration, Management) function to manage charging statistics and call processing for each communication network. In addition, when the VoIP-based collect call service according to the present invention is serviced on a membership basis, it is possible to confirm whether the caller is a customer who has subscribed to the service, and to check whether the caller has paid the service fee and grant the service use right. The user authentication function can be further performed.

4 is a flowchart schematically illustrating a VoIP based collect call service method according to the present invention.

Referring to FIG. 4, in step 200, a collect call call request including an identifier capable of identifying a VoIP collect call and a receiver terminal number from a caller terminal is transmitted to a collect call exchange.

In step 210, when a collect call call request is received from the caller terminal, the corresponding receiver terminal number is extracted from the collect call call request, and then the receiver terminal is called.

In step 220, after the called party terminal responds, it is determined whether to connect a collect call from the originator, and if a result is transmitted, it is determined whether the received result is a connection request or a reject request. As a result of the determination, in the case of the connection request, the VoIP-based collect call service proceeds to step 230, and in the case of the rejection request, ends.

In step 230, when a connection request is received from the receiver terminal, a voice call path between the caller terminal and the receiver terminal is connected. Connected voice paths allow callers and receivers to make voice calls. Once the voice call is connected, the total talk time begins to be calculated to calculate the toll free charge.

In step 240, when a call termination request is normally received from the calling terminal or the called terminal, the voice call path connected between the calling terminal and the called terminal is released, and the total call time calculation is also terminated.

In step 250, the calculated total talk time is multiplied by the hourly rate according to the type of the receiver terminal to calculate the toll fee, and the calculated toll fee is charged to the receiver.

5 is a flowchart illustrating a signal transmission and reception process in a VoIP based collect call service system according to the present invention. In particular, the flowchart illustrated in FIG. 5 illustrates a signal transmission / reception process when the gatekeeper is not included in the VoIP-based collect call service system and thus the RAS is not implemented.

Referring to FIG. 5, in step 300, the calling party terminal transmits a collect call call request to the calling gateway. The collect call call request includes an identifier capable of identifying a VoIP collect call and a receiver terminal number. If the calling terminal is a VoIP stand-alone telephone or a personal computer, step 300 may be omitted.

In step 305, if a collect call call request is received from the calling party terminal, the calling gateway performs call signaling to the corresponding receiving gateway by the collect call identifier. Since this embodiment is implemented in a VoIP system conforming to the H.323 standard, call signaling is a message according to the H.225 protocol. Since the gatekeeper is not included in the system, call signaling messages generated at the originating gateway are sent directly to the receiving gateway without going through the gatekeeper. After receiving the call signaling message from the calling gateway, the receiving gateway and the calling gateway are connected through the VoIP network. Control signaling messages for connected paths are exchanged between the calling gateway and the receiving gateway according to the H.245 standard (not shown).

In step 310, the calling gateway and the receiving gateway connected through the VoIP network request the PSTN connection to the collect call exchange. The collect call exchanger requesting the PSTN connection for the collect call through the VoIP network from the receiving gateway establishes the PSTN link.

In step 315, the collect call exchange calls the corresponding called party terminal using the called party terminal number included in the collect call call request. In response to the called party's call, the collect call exchange establishes a PSTN link with the called party's terminal and then, in step 320, outputs a voice message informing the called party's terminal of the collect call request.

In step 325, after the output of the voice message is terminated, the collect call exchange connects the voice call path between the calling party terminal and the called party terminal for a predetermined time, so that the called party can identify the calling party. Step 325 may be omitted according to the operator's policy.

In step 330, after the predetermined time ends to release the voice call path between the calling party terminal and the called party terminal, the collect call exchanger outputs a voice message asking whether to approve the collect call from the calling party to the called party terminal. Then, when a DTMF tone corresponding to a specific button is received from the receiver terminal, it is analyzed to determine whether the receiver has requested a connection. As a result of the determination, when the receiver makes a connection request, in step 340, the collect call exchanger connects the voice call path between the calling party terminal and the called party terminal to enable voice calling, and calculates the total talk time for calculating the toll fee. To start. Thereafter, when a call termination request is normally received from the caller terminal or the receiver terminal, the connected voice call path is released and the total call time calculation ends. The toll fee is then calculated.

6 is a flowchart schematically illustrating a signal transmission and reception process through a collect call proxy server. In particular, the flowchart illustrated in FIG. 6 illustrates a signal transmission / reception process when the call call proxy server further includes a caller's service use approval and billing related information checking procedure. In the description of FIG. 6, the same parts as the description of FIG. 5 will be omitted without departing from the spirit of the invention.

Referring to FIG. 6, in step 400, when a PSTN link connection request is received from a caller terminal by a collect call call request, the calling gateway establishes a PSTN link with the caller terminal. Step 400 may be omitted if the calling terminal is a personal computer comprising a software / hardware implemented gateway module or via a server comprising a gateway module and a VoIP stand-alone telephone comprising a gateway module.

In step 405, when the PSTN link is established with the calling party terminal, the calling gateway transmits the collect call call request and information on the calling terminal to the collect call proxy server and requests the receiving gateway to relay the collect call call request. In addition, if the caller needs to confirm whether the caller is a user authorized to use the VoIP-based collect call service provided by the preferred embodiment of the present invention and any billing processing for the caller, the confirmation may be requested. have.

In steps 410 and 415, when the collect call call request and the information on the calling party terminal are received from the calling gateway, the collect call proxy server checks whether the caller is authorized to use the service, authenticates the authentication, and then sends the authentication result. Transmit to the caller terminal via the gateway. In more detail, the collect call proxy server relays the connection to the toll-free service network and the VoIP network of various network operators according to the caller terminal number requested by the caller, calculates call statistics for each caller, and additional services such as CID. To provide. Then, billing statistics for each communication network are calculated and call processing management is performed. In addition, the collect call proxy server may additionally perform a check on the caller when a certain charging process is required for the use of the service.

In step 420, the collect call proxy server transmits a call signaling message by the collect call call request to the receiving gateway so that the calling gateway and the receiving gateway are connected.

Steps 425 to 455 are the same as those of steps 310 to 340 of FIG. 5, and thus description thereof is omitted.

7 is a flowchart schematically illustrating a signal transmission and reception process through a collect call proxy server and a gatekeeper. In particular, the flowchart shown in FIG. 7 is a VoIP-based collect call service system including a gatekeeper, and illustrates a signal transmission / reception process when RAS is implemented. In the description of FIG. 7, the same parts as the descriptions of FIGS. 5 and 6 will be omitted within the scope of the present invention.

Steps 500 to 505 and 515 are the same as steps 400 to 410 of FIG. 6, and thus description thereof is omitted.

In step 510, the collect call proxy server receiving the collect call call request and the information on the caller terminal from the calling gateway sends a RAS message requesting the calling gateway registration to the gatekeeper managing the components of the VoIP-based collect call service system. send. Upon receiving the RAS message from the collect call proxy server, the gatekeeper performs the caller's collect call with the registration of the originating gateway. The gatekeeper also retrieves the connection information for the receiving gateway suitable for processing the collect call call request requested by the calling terminal.

In step 520, the gatekeeper sends registration to the originating gateway, acknowledgment of the collect call, and access information for the corresponding receiving gateway to the collect call proxy server. After receiving the approval result and the access information to the receiving gateway from the gatekeeper, the collect call proxy server determines whether the caller approves the use of the service together with the confirmation result of step 515.

In step 525, the collect call proxy server transmits the acknowledgment result to the caller terminal through the calling gateway, and then transmits the collect call call request to the gateway corresponding to the receiving gateway access information received from the gatekeeper in step 530. Relay connection setting between gateway and receiving gateway.

In another embodiment, the caller terminal receiving the service approval from the collect call proxy server in step 525 may transmit the caller information stored therein to the gatekeeper through the collect call proxy server. Upon acknowledgment from the gatekeeper, the caller information is sent to the receiving gateway and may be displayed on the recipient terminal via the collect call exchange. Here, the caller information may be a text, an image, or a combination thereof.

Steps 535 to 565 are the same as steps 425 to 455 of FIG. 5, and thus description thereof is omitted.

In the present specification, a part of the connection path between the sender terminal and the receiver terminal is set to a non-billing interval using a VoIP network, and a VoIP based collect call service method and system capable of drastically reducing toll charges will be described with reference to embodiments. Explained. However, the present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention. In addition, the scope of the present invention can be interpreted only by the claims described below.

As described above, according to the present invention, the caller can use the voice call service by the VoIP system without having to purchase a prepaid card in advance, and the receiver is only by the receiving terminal location and type regardless of the type and location of the calling terminal. By paying a flat fee, the fee burden on the recipient is reduced. And, due to this, activation of the toll free service is expected.

Further, since the access information for the VoIP collect call service system provided by the present invention is known to the caller terminal or the gateway coupled to the caller terminal, anyone can easily connect. As a result, anyone can easily access the VoIP collect call service system, but unlike the conventional VoIP voice call service system, hacking of the gateway or gatekeeper for using the VoIP voice call service without permission is completely meaningless.

Claims (12)

In the method of providing a collect call service using a VoIP system, Setting up a first call-to-collect exchange period first link with a receiving gateway corresponding to a collect call call request received through a VoIP network formed between an originating gateway coupled to a caller terminal and a receiving gateway coupled to a collect call exchange; Wherein the sender terminal can directly connect to the receiving gateway using information required for access to a known receiving gateway in advance; When the first link is established, setting up a second link between the collect call exchange and the called party by calling the called terminal by the collect call exchange; When a collect call reception request in the form of DTMF signals is received from the receiver terminal, connecting a voice call between the originator terminal and the receiver terminal and initiating charging for the second link; And When a normal call termination request is received from the caller terminal or the receiver terminal, the voice call between the caller terminal and the receiver terminal is released, and the charge call for the second link is terminated. How we deliver the service. The method of claim 1, The VoIP system is a method of providing a collect call service using a VoIP system, characterized in that the standard of any one of H.323, Session Initiation Protocol (SIP), Media Gateway Control Protocol (MGCP). The method of claim 1, The caller terminal A computer with an outgoing gateway module implemented in software or hardware, a VoIP stand-alone phone equipped with an outgoing gateway module implemented in software or hardware, or a general phone accessible to the calling gateway through a public telephone network. Collect call service providing method using a VoIP system, characterized in that any one. The method of claim 1, When the second link is established between the collect call exchanger and the receiver terminal, the voice call between the caller terminal and the called party terminal is temporarily connected, and when a certain time elapses, the connected voice call is released, and the call request is received from the receiver terminal. Waiting until the received further comprises the collect call service providing method using a VoIP system. The method of claim 1, The billing for the second link, which is a toll charge, is calculated by multiplying a predetermined hourly call rate and total talk time according to the type of the receiver terminal. The method of claim 1, The received collect call call request, Method of providing a collect call service using a VoIP system, characterized in that the relayed by the collect call proxy server for performing the authentication and the corresponding charge for the caller terminal is transmitted to the receiving gateway. In the collect call service providing method using a VoIP system composed of a plurality of gateways, In response to a collect call call request received from a caller terminal that knows access information to a collect call service providing system using VoIP, authentication is performed on the caller terminal and RAS (Registration / Admission / Status) for the collect call. Acquiring authorization and access information to a receiving gateway corresponding to the receiver terminal; Establishing a connection between the originating gateway and the receiving gateway by transmitting a collect call call request to the receiving gateway when acquiring the RAS acknowledgment of the collect call and access information to the receiving gateway; Establishing a first call exchange period with the receiving gateway in response to the received collect call request; When the first link is established, setting up a second link between the collect call exchange and the called party by calling the called terminal by the collect call exchange; If a collect call reception request is received from the receiver terminal, connecting a voice call between the originator terminal and the receiver terminal and initiating charging for the second link; And When a normal call termination request is received from the caller terminal or the receiver terminal, the voice call between the caller terminal and the receiver terminal is released, and the charge call for the second link is terminated. How we deliver the service. The method of claim 7, wherein Authentication for the caller terminal is Method for providing a collect call service using a VoIP system, characterized in that the caller to confirm whether the membership and whether the billing information corresponding thereto. The method of claim 7, wherein Connection information to the receiving gateway is And at least one of a type and a location of the receiver terminal, the connection information of a receiver gateway located in a path through which a minimum toll fee can be calculated. The method of claim 7, wherein When a second link is established between the collect call exchanger and the called party terminal, the voice call between the calling party terminal and the called party terminal is disconnected for a predetermined time and then released, until a collect call reception request is received from the called party terminal. Collect call service providing method using a VoIP system, characterized in that it further comprises the step of waiting. In a VoIP system that provides a collect call service, A receiving gateway coupled to a calling gateway coupled to a calling party through a VoIP network and connecting a voice call with the calling terminal in response to a collect call call request received from the calling terminal through the VoIP network, wherein The sender terminal can directly connect to the receiving gateway using information necessary for access to a known receiving gateway; And Coupled with a called party terminal through a public telephone network or a mobile communication network, establishing a first link with the called gateway, and establishing a second link with the called terminal according to a collect call call request received from the receiving gateway; And a collect call exchanger configured to connect a voice call in response to a collect call reception request received from the receiver terminal, and perform charging for the second link. The method of claim 11, In response to the collect call call request received from the caller terminal, the caller terminal authenticates the caller terminal, obtains RAS approval for the collect call, and access information to a receiving gateway corresponding to the receiver terminal. And a collect call proxy server for transmitting the collect call call request to the receiving gateway using the information.