KR20050027658A - Broadcasting system and method using gatekeeper in voice over internet protocol network - Google Patents

Abstract

A broadcast system and method using a gate keeper in a VoIP network are provided to reduce a cost for installation of a line according to setting a port between switching systems and the amount of operation of a system manager according to setting/expanding/changing of a system. A gate keeper sets a broadcast group with respect to gateways registered for the gate keeper under the control of a broadcast management module(S30). When the gate keeper receives a call setup request from an origination gateway which has been registered for an origination MSC(Mobile Switching Center)(S31), the gate keeper checks whether the corresponding call setup request is an office line call setup request or a broadcast call setup request(S32). If the call setup request is the broadcast call setup request, the gate keeper performs broadcast signaling by using multicast under a control of a multipoint of a multipoint controller(S33).

Description

BROADCASTING SYSTEM AND METHOD USING GATEKEEPER IN VOICE OVER INTERNET PROTOCOL NETWORK}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system. In particular, when a broadcast service is performed between switching systems based on Voice over Internet Protocol (VoIP), a signaling process for a multi-party conference is performed according to the H.323 protocol. By the gatekeeper performing the multipoint control function, even if the switching system without the separate broadcast logic performs only the H.323 standard signaling by using the multicast address assigned by the gatekeeper's broadcast logic function, A broadcast system and method using a gatekeeper in a BIO IP network capable of performing a broadcast service.

1 is a block diagram showing a simplified configuration of a conventional private exchange system. As shown in the drawing, a conventional private exchange system typically uses an originating exchange 10 and a plurality of receiving exchanges 20 to 40. In addition to performing the connection service, the originating exchange 10 may designate all or specific receiving exchanges 20 to 40 to perform a predetermined broadcast service.

That is, the originating exchange 10 manages a plurality of receiving exchangers 20 to 40 as broadcast group data through the broadcast management module 12, and has a main logic for broadcasting when a broadcast command is applied by a system administrator. The originating exchange 10 selects the receiving exchanges 20 to 40 to receive the broadcast according to the broadcast group data, and accordingly the selected receiving exchange using the first broadcasting device 10 of the originating exchange 10. Broadcast signaling with each of the broadcast apparatuses 21, 31, and 41 of 20 to 40 is performed.

Here, the broadcast signaling between the originating exchange 10 and the plurality of receiving exchanges 20 to 40 is a signaling that occupies a channel similarly to a general trunk line call setup, and is selected by the originating exchange 10 when performing broadcast signaling. When the receiving switch 20 to 40 transmits a message requesting a broadcast connection and the receiving switch 20 to 40 transmits an acknowledgment message, a broadcast channel is opened to open the first broadcasting device of the originating switch 10. From (11), the broadcast of a specific content is transmitted to the corresponding receiving switch 20-20.

Therefore, in order for the originating exchange 10 to perform a broadcast service with a specific receiving exchange 20 to 40, each receiving exchange (via ports 1 to port n) is provided through the same number of ports (ports 1 to n). Since 20-40 must be connected, in order to provide a broadcast service using the originating exchange 1, a separate line cost required for installing a plurality of ports is required.

Recently, a communication system using a Voice over Internet Protocol (VoIP) network, which is advantageous in terms of installation cost and line cost, has emerged, especially in a private branch (Private Branch). The eXchange system also provides voice / video / data communication services over the local area network (LAN) using the V.IP standard protocol H.323.

Here, the private exchange system based on the IPP network is connected to the broadcasting devices 11, 21, 31, and 41 of each of the exchanges 10 to 40 to connect the switches 10 to 40 and the IP network (not shown). Since broadcasting signaling is performed through an interworking gateway (not shown), a line extension cost is reduced compared to the case of providing a broadcasting service using a public telephone network, but a codec for implementing a real-time transport protocol (RTP) is implemented. Alternatively, in order to change a transmission mode such as a transmission address of each receiving exchanger 20 to 40, it is troublesome to change the information of all the exchangers 10 to 40 one by one.

In addition, when adding or deleting a gateway (not shown) of the receiving exchanger 20 to 40, the system administrator must separately perform a task of changing the setting of the originating exchanger 10.

Therefore, in the prior art as described above, when providing a broadcasting service to a receiving exchange in a private switching system using a public telephone network, it is necessary to connect a separate port between the calling exchange and each receiving exchange, so that a plurality of ports can be installed. There was a problem in that the cost of the circuit was added, and in the case of the private exchange system using the IP network, the information of the exchange must be changed in order to change the various transmission modes or add / delete the gateway of the receiving exchange. There was a problem that the time wasted and costs increase due to.

Therefore, the present invention has been proposed to solve the above-mentioned problems. When performing a one-way broadcast service between VIO-based switching systems, signaling for a multi-party conference is performed according to the H.323 protocol. It is an object of the present invention to provide a broadcast system and a method for a gatekeeper to perform a multipoint control function.

In order to achieve the above object, the present invention sets up and manages a broadcast group for a registered gateway, checks whether a call is set up for a broadcast call, and uses multicasting according to multipoint control. A gatekeeper for signaling for configuration; And a broadcast management module for forming a data channel with the gatekeeper and controlling the gatekeeper to set and manage the broadcast group.

In addition, the present invention comprises the steps of setting a broadcast group for the registered gateway; When a call setup request is received from the registered originating gateway, determining whether the call setup request is a local line call or a broadcast call by a gatekeeper; As a result of the check, when the received call setup request is a broadcast call, the method may include performing broadcast signaling using multicast according to multipoint control.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a network diagram showing a simplified configuration of a broadcasting system using a gatekeeper in the VIO IP network of the present invention. As shown in FIG. 2, an originating exchange 100, a plurality of receiving exchanges 200 to 400, and an IP ( IP, Internet Protocol) network 500, the gatekeeper (GateKeeper) 600, and broadcast management module 700.

In addition, the present invention is assumed to implement a broadcast system between the switch 100 to 400 using H.323, which is a standard protocol in a Voice over IP (VoIP) network, and in the present invention, the H.323 protocol. The gatekeeper 600 performs a multipoint control function to process signaling for a multi-party conference according to the present invention, thereby using the multicast address generated by the broadcast logic function of the gatekeeper 600. Thus, even if the outgoing exchange 100 and the reception exchanger 200 to 400 without separate broadcast logic perform only H.323 standard signaling, one-way broadcast service can be supported.

In the present invention, the originating exchange 100 and each of the receiving exchanges 200 to 400 and the gateways 110, 210, 310, and 410 are integrally or separately configured and connected by data lines. Typically, the exchanges 100 to 400 are gateways. (110, 210, 310, 410) is used to set up a local line or broadcast call, in particular, in the present invention, any outgoing exchange 100 designated by the system administrator provides a one-way broadcast service of a specific content to a plurality of receiving exchanges (200 to 400). Assume to do

Here, the gateways 110, 210, 310, and 410 support the H.323 protocol and convert the transmission format, call setup process, voice / video / data, etc. so that each exchange 100 to 400 can interwork with the IP network 500. All gateways 110, 210, 310, and 410 present in the same IP network 500 are registered with the gatekeeper 600.

And, the gatekeeper 600 is logically separated from the H.323 terminal, but physically a terminal (not shown), MCU (not shown), gateways (110, 210, 310, 410), MC (Multipoint Controller), or non It is also installed with the H.323 LAN (LAN) device, each exchange (100) through the signaling according to the H.245 protocol (RAS, Registration Admission Status) of the H.225 protocol with the gateway (110, 210, 310, 410) 400 to provide a call control service.

That is, the gatekeeper 600 performs functions such as address translation, call control signaling, call authentication, call management, admission control, bandwidth control and management according to the H.323 protocol, and the terminal registered with the terminal (not shown). City), MC (Multipoint Conference Unit (MCU) (not shown), gateways (110, 210, 310, 410) and the like provides services such as regional management.

In particular, the gatekeeper 600 broadcasts the gateways 110, 210, 310, and 410 registered in the same IP network 500 under the control of the broadcast management module 700, in addition to performing signaling for setting a local call. Set up and manage a group and check whether or not a call setup request for a broadcast call is received from the originating exchange 100. If the call setup request occurs as a result of the check, the designated receiver switch 200-400 and the multipoint controller According to the multipoint control of a multipoint controller (MC), broadcast signaling using multicast is performed to provide a unidirectional broadcast service between the originating switch 100 and the receiving switch 200 to 400.

In general, the H.323 protocol supports multiparty conferences using a multipoint controller (MC) and a multipoint processor (MP), where the multipoint controller is a switch (100-400) participating in the conference. ) And serve as a signaling component for setting common mode by exchanging the functional information of the exchanges (100 to 400), and the multipoint processor is responsible for processing, mixing and switching media streams in a bidirectional multiparty conference.

Therefore, in a one-way multi-party conference in which a specific originating exchange 100 unilaterally announces broadcasting of a specific content from a plurality of receiving exchanges 200 to 400, it is possible to set up a broadcast call using only the multipoint controller. In the present invention, when the gatekeeper 600 receives a broadcast call setup request from the originating exchange 100 by including the function of the multipoint controller in the gatekeeper 600, the originating exchange (using the H.245 multiparty signaling) 100) and a channel for a broadcast call between a plurality of receiving exchangers 200 to 400, and accordingly a calling exchange using a multicast address generated by the broadcasting logic function of the gatekeeper 600. 100 and the reception exchanger 200 to 400 can receive broadcast service support even if they perform only H.323 standard signaling without broadcast logic.

In addition, the broadcast management module 700 may be integrally formed with the gatekeeper 600 or separately located at a system management block (not shown) to form a data channel with the gatekeeper 600, and to the originating exchange 100. By controlling the gatekeeper 600 to provide a broadcast service to the receiving switch (200 to 400) designated by the program to provide a program for managing the receiving switch (200 to 400) in a certain type of broadcast group.

That is, the broadcast management module 700 always opens the data channel with the gatekeeper 600, and provides the system administrator with information about the gateways 110, 210, 310, and 410 registered in the gatekeeper 600, as well as the system. An administrator assigns a unique number to each of the gateways 110, 210, 310, and 410 registered in the gatekeeper 600 through a management program of the broadcast management module 700, and bundles them in predetermined units to form a broadcast group.

Then, even if the gateways 210, 310 and 410 of the receiving exchanger 200 to 400 are added / deleted, the originating exchange 100 is designated for the broadcast connection only by changing the broadcast group through the broadcast management module 700 without changing the system setting. It is possible to provide a one-way broadcast service to the receiving switchboards 200 to 400.

Meanwhile, referring to the flowchart of FIG. 3, the gatekeeper 600 first sets a broadcast group for gateways 110, 210, 310, and 410 registered therein under the control of the broadcast management module 700. (S30).

Then, when a call setup request is received from the registered originating gateway 100 of the originating exchange 100 (S31), the gatekeeper 600 checks whether the call setup request is a local line call or a broadcast call (S32). ).

That is, in the present invention, since only the gatekeeper 600 has broadcast logic capable of setting a broadcast call using H.245 multiparty signaling, the other gateways 110, 210, 310, and 410 do not have broadcast logic, and thus, the originating exchange 100 may use a local line or a call. When requesting a broadcast call setup, a call setup request message, which is a standard signaling conforming to H.323 protocol, is transmitted to the gatekeeper 600 to request call setup.

Here, the call setup request message includes information on a broadcast group designated by the system administrator to provide a broadcast service when the originating exchange 100 requests the setup of a broadcast call, and thus, the gatekeeper 600 at step S31. Analyzes the call setup request message to determine whether the call is a local call or a broadcast call setup request according to whether the message includes the broadcast group information, and as a result, the message includes the broadcast group information. If it is determined that it is a local call setup request, the gatekeeper 600 performs signaling for establishing a local call between the originating exchange 100 and the receiving exchanges 200 to 400 designated as destinations in the call setup request message. Perform one-to-one connection by performing (S34).

If the check result indicates that the message includes the information on the broadcast group and is a broadcast call setup request, the gatekeeper 600 broadcasts the signal using multicast according to the multipoint control of the multipoint controller. Perform (S33).

That is, the gatekeeper 600 transmits a message conforming to the H.225 protocol to the first registered random gateway among the information on the broadcast group included in the call setup request message, thereby H.245 for one-to-one connection with the corresponding gateway. A protocol control channel is formed, and a message conforming to the H.225 protocol is transmitted to other gateways in the corresponding broadcast group to form an H.245 protocol control channel and a logical channel to perform broadcast signaling by unidirectional conference.

In the signal flow diagram of FIG. 4, the gatekeeper 600 forms a control channel for one-to-one connection with the first gateway 210 registered first among information on the corresponding broadcast group, and the originating gateway of the originating exchange 100 ( Assuming that 100 wants to perform a broadcast service with the second gateway 310, the gatekeeper 600 first establishes a control channel with the first gateway 210 in response to a call setup request of the originating gateway 110. After forming a channel that can be expanded to a multi-party conference, and attempts to simultaneously set up a broadcast call for the multi-party conference with another gateway 310 in the broadcast group.

That is, the gatekeeper 600 transmits a broadcast call setup request message conforming to the H.225 protocol to the second gateway 310 and receives a response message to control the H.245 protocol with the second gateway 310. After the channel is formed, when the H.245 protocol logical channel establishment request is received from the second gateway 310, a multicast address is allocated to the response message and transmitted.

Next, when the logical channel is established, the gatekeeper 600 transmits a conference mode change report message (CommunicationModeCommand) to the calling gateway 110 and the second gateway 310 to switch to the current conference mode to provide a broadcast service. By notifying that the initiation, the originating gateway 110 transmits the broadcast information as a multicast Real-time Transport Protocol (RTP) packet to each gateway (110, 210, 310, 410), whereby each gateway (110, 210, 310, 410) is assigned to it The broadcast information is received by extracting a multicast RTP packet having a multicast address.

Here, even if a codec included in each gateway 110, 210, 310, 410, or a transmission address assigned thereto is changed, the gatekeeper 600 does not need to change information of all the gateways 110, 210, 310, 410 as before, and the multi-mode conference mode switch report message does not need to be changed. Including the changed information in the transmission to the originating gateway 110 of the originating exchange 100 and the first gateway 210 registered first of the broadcast group to perform the operation according to the changed codec or the transmission address assigned thereto. do.

As described above, the present invention provides a multipoint control function for processing signaling for a multiparty conference in accordance with the H.323 protocol when performing a broadcast service between VIO-based switching systems. By the keeper, by using the multicast address allocated by the broadcast logic function of the gatekeeper, each switching system without separate broadcasting logic can be supported with one-way broadcasting service even if only H.323 standard signaling is performed. It can reduce the line expansion cost according to the port setting between systems, and reduce the work load of the system administrator due to the setting / expansion / change of the system.

Figure 1 is a block diagram showing a simplified configuration of a conventional private exchange system.

Figure 2 is a network configuration showing a simplified configuration of a broadcast system using a gatekeeper in the VIO IP network of the present invention.

Figure 3 is a flow chart showing the operation of the broadcast method using a gatekeeper in the VIO IP network of the present invention.

Figure 4 is a signal flow diagram showing the flow of signals between the gatekeeper and each gateway in the broadcast method using a gatekeeper in the VIO IP network of the present invention.

*** Description of the symbols for the main parts of the drawings ***

100: outgoing exchange 110,210,310,410: gateway

200 to 400: Receiving exchange 500: Eye bell pepper

600: gatekeeper 700: broadcasting management module

Claims (5)

A gatekeeper for setting and managing a broadcast group for the registered gateway, checking whether a call is set up for a broadcast call, and performing signaling for multicasting or broadcast signaling using multicast according to multipoint control; And a broadcast management module for forming a data channel with the gate keeper and controlling the gate keeper to set and manage the broadcast group. The broadcast system of claim 1, wherein the gatekeeper includes a multipoint controller of an H.323 protocol. Setting up a broadcast group for a registered gateway; When a call setup request is received from the registered originating gateway, determining whether the call setup request is a local line call or a broadcast call by a gatekeeper; And confirming that the received call setup request is a broadcast call, performing broadcast signaling using multicast according to multipoint control. The method of claim 3, wherein the determining whether the call is a call or a broadcast call comprises determining that the call is a broadcast call if the received call setup request message includes information on a broadcast group, and otherwise, checking that the call is a call. Broadcasting method using a gatekeeper in the VIO PIP. 4. The method of claim 3, wherein the performing of the broadcast signaling comprises: forming a control channel for one-to-one connection with a gateway first registered among information on a broadcast group included in a call establishment request message; ; Forming, by the gatekeeper, a control channel and a logical channel simultaneously with another gateway to provide a broadcast service; And a gatekeeper assigning a multicast address to the gateway on which the logical channel is formed, and performing a one-way broadcast service through a multi-party conference.