KR100501329B1 - VoIP NETWORK SYSTEM AND CALL CONNECTION THE METHOD OF THIS SYSTEM - Google Patents

Abstract

The present invention relates to a VoIP network system and a call connection method of the system. The call connection method of the VoIP network system according to the present invention provides a PSTN backup port of a gateway when a subscriber needs PSTN backup according to a service class of a plurality of subscribers. PSTN backup port designation step of designating private exchange or PSTN network, and VoIP call connection step of attempting to make VoIP call connection through IP network when detecting a VoIP call connection attempt signal from the plurality of subscribers. And a VoIP call connection step of performing a VoIP call connection through the IP network if the gateway succeeds in the VoIP call connection attempt, and designates the PSTN backup port designation step if the gateway fails to attempt the VoIP call connection. Perform PSTN backup that performs PSTN backup through PSTN backup port It is characterized by including a system.

Therefore, according to the VoIP network system and the call connection method of the present invention, it is possible to provide subscribers with differentiated services according to service levels and to reduce waste of resources of the VoIP network system.

Description

VOIP NETWORK SYSTEM AND CALL CONNECTION THE METHOD OF THIS SYSTEM}

The present invention relates to a call connection method of a VoIP network system, and more particularly, to a call connection method of a VoIP network system that provides a differentiated service to a subscriber by designating a PSTN backup port in advance when a VoIP call connection is impossible. will be.

VoIP is a term that refers to IP telephony technology for a series of facilities that deliver voice information using an IP network. In general, this means that voice information is sent in digital form in discrete packets, rather than a traditional protocol based on a circuit, such as a public switched network (PSTN).

The main advantage of VoIP and Internet telephony technology is that it integrates telephone service by utilizing existing IP network network so that telephone users can receive long distance and international phone service in internet and intranet environment with only local call charge.

VoIP calls can be used by VoIP call users to locate other users to encourage the use of ITU-T, H.323, a standard for transporting voice and video over IP over the public Internet or intra-company intranets. It enables the use of touch phone signals for automatic telephone distribution and voice mail.

In addition to the original IP functionality, VoIP uses Real Time Protocol (RTP) to support packets arriving in a timely manner. Using public network networks, it is currently difficult to guarantee quality of service (QoS). Better service can be achieved by using a private network managed by an independent company or an Internet telephony service provider (ITSP).

1 is a block diagram of a conventional VoIP network system.

Referring to FIG. 1, in a VoIP network, one PBX 2a and a router 3a are connected to one gateway 1a, and a PSTN network 4a is connected to the PBX 2a and the router 3a. Is configured to be connected to the IP network 5.

When the gateway 1a receives the VoIP call connection attempt signal of each of the plurality of subscribers through the PBX 2a, the gateway 1a converts the VoIP call connection attempt signal into packet information and transmits the packet to the router 3a to transmit the IP network network ( 5) If the VoIP call connection attempt is made and it is determined that the VoIP call connection through the IP network 5 is possible, the call service through the IP network 5 is provided (VoIP service). If it is determined that the VoIP call connection through the IP network 5 is impossible, the PSTN backup is unconditionally performed to the PBX 2a linked to the corresponding gateway 1a without selecting the subscriber's grade or the PSTN network.

When the PBX 2a is connected to the plurality of subscriber stations and receives the VoIP call connection attempt signal from each of the plurality of subscriber stations, the PBX 2a transmits the VoIP call connection attempt signal to the gateway 1a, and the PSTN backup call from the gateway 1a. Upon receiving the attempt, the call connection signal is transmitted to the PSTN network 4a interworking with the PBX 2a.

Digital interfaces include T1 or E1 interfaces or PRI (Primary Rate Interface), and analog interfaces include Loop SLC (FXS, FXO) interfaces.

PRI is an ISDN interface, and PRI consists of one 64Kbps D-channel and 23 B-channels (T1) or 30 B-channels (E1) to be used for voice or data.

 Loop SL has an FXO card and an FXS card that provide the same channel to each of the gateway (1a) and the RBX (2a) .The FXO card is dedicated to outgoing, where the signal is sent. It is used exclusively for incoming incoming and requires as many channels as the number of channels to support multiple channels.

 The router 3a is a device connecting the gateway 1a and the IP network 5 to connect the network layers.

The router 3a determines a node in another network or its own network according to the routing table in addition to the function of the bridge. The packet is selected by selecting the most efficient path among several paths.

When the PSTN network 4a receives the call connection signal from the PBX 1a, the PSTN network 4a performs the call connection.

The PSTN network 4a actually provides most of the call connections of long distance infrastructure with respect to the Internet. Internet service providers, called Internet Service Providers (ISPs), pay long distance companies and lease high-speed leased lines, and then use packet-switched schemes to allow many users to share the line. Even if you access a remote server, you do not have to pay extra long distance charges, and many ISPs operate the service for only a monthly fee.

The IP network 5 serves to receive the packet from the router 3a and transmit and receive the packet to the destination of the packet.

2 is a flowchart illustrating a call connection method of a conventional VoIP network system.

The first gateway 1a determines whether a VoIP call connection attempt signal from the first PBX 2a to the subscriber of the second PBX 2b is detected (step S11).

When the VoIP call connection attempt signal is detected from the first PBX 2a to the subscriber of the second PBX 2b by step S11, the first gateway 1a determines whether the VoIP call connection through the IP network 5 is possible. (Step S12).

If it is determined in step S12 that the VoIP call connection through the IP network 5 is impossible, an unconditional PSTN backup is performed to the first PBX 2a interworking with the first gateway 1a (step S13).

At this time, if the interface of the PBX and the gateway is a digital interface such as T1, E1 or PRI, unconditional PSTN backup is performed through one line, but if an analog interface such as loop SL is used, random among multiple circuits. PSTN backup is performed via one circuit selected.

Upon receiving the PSTN backup call attempt in step S13, the first PBX 2a performs a call connection through the first PSTN network 4a interworking with the first PBX 2a and terminates the call connection method of the VoIP network system. (Step S14).

If it is determined in step S12 that the VoIP call connection through the IP network 5 is possible, the VoIP call connection is performed through the IP network 5 and the call connection method of the VoIP network system is terminated (step S15).

Such a conventional VoIP network performs unconditional PSTN backup to the PBX connected to the gateway regardless of the service class of the subscriber or the configuration of the PSTN backup line, and thus cannot provide differentiated services according to the subscriber class.

For reference, the service provider grades the subscriber as follows.

For subscribers using the Internet, VoIP call quality is poor and PSTN backup is not guaranteed.

In case of subscriber using private network system, VoIP call quality is good, VoIP call connection is impossible and PSTN backup is performed to provide continuous VoIP service.

Subscribers who use private network system that guarantees quality of service (QoS) are provided with continuous and stable VoIP service by connecting calls to specific PSTN backup port when VoIP call connection is not possible and even when voice quality is degraded. .

In addition, the conventional VoIP network has a problem that even if the subscriber does not need the PSTN backup unnecessarily waste the unnecessary resources by performing the PSTN backup unconditionally.

Accordingly, an object of the present invention is to pre-specify the PSTN backup port according to the service class of the subscriber, and to perform a PSTN backup through the designated PSTN backup port to provide differentiated services according to the service class of the subscriber and to reduce waste of resources. To provide a VoIP network system and a call connection method of the system.

In order to realize the above object, the VoIP network system of the present invention is connected to a plurality of subscriber stations, receives and transmits a VoIP call connection attempt signal of each of the plurality of subscriber stations, and receives a PSTN backup call attempt signal. At least one private exchange performing a call connection through a PSTN network connected to the private exchange, and a subscriber who needs PSTN backup according to the service class of each of the plurality of subscriber stations, to the PSTN backup port of the gateway. After designating a PSTN network, perform VoIP call connection of each of the plurality of subscriber stations, and if the VoIP call connection of the subscriber fails, a gateway for performing PSTN backup through the designated PSTN backup port and transmitting from the gateway; When receiving a VoIP call connection signal, the IP network It is characterized in that it comprises a router for transferring the packet to the corresponding destination of the VoIP call connection signal.

In order to realize the above object, the call connection method of the VoIP network system of the present invention provides a PSTN backup that designates a private exchange or a PSTN network as a PSTN backup port of a gateway when a subscriber needs PSTN backup according to a service class of a plurality of subscribers. A port assignment step, a VoIP call connection step in which the gateway attempts to connect the VoIP call through an IP network when detecting a VoIP call connection attempt signal from the plurality of subscribers, and the gateway attempts to connect the VoIP call If successful, the VoIP call connection step of performing a VoIP call connection through the IP network network, and if the gateway fails to attempt the VoIP call connection, the PSTN backup is performed through the PSTN backup port designated in the PSTN backup port designation step. And performing a PSTN backup step.

Hereinafter, a VoIP network system of the present invention and a call connection method of the system will be described with reference to the accompanying drawings.

3 is a diagram showing an example of the configuration of the VoIP network system of the present invention.

Referring to FIG. 3, in the VoIP network system of the present invention, a plurality of PBXs 20a and 20b, a router 30a, and a PSTN network 40a are connected to one gateway 10a, and a plurality of PBXs 20a are connected. 20b) PSTN network 40a is connected to each other, and router 30a is configured to be connected to IP network 50.

The gateway 10a designates a private switch 20a, 20b or a PSTN network 40a as a PSTN backup port of the gateway 10a in the case of a subscriber requiring a PSTN backup for each service class of a plurality of subscriber stations. After performing this process, if the VoIP call connection attempt signal of each of the plurality of subscriber stations is detected through the PBX 20a connected to each of the plurality of subscriber stations, the VoIP call connection attempt signal is converted into packet information and the router Attempt to connect to the VoIP call through the IP network 50 by transmitting to (30a).

If the VoIP call connection through the IP network 50 is successful, the VoIP call service through the IP network 50 is provided, and if it is impossible to connect the VoIP call through the IP network 50, each of the subscribers services. The PSTN backup call attempt is performed by sending the PSTN backup call attempt through the designated PSTN backup port.

When the PBX 20a is connected to a plurality of subscriber stations and transmits a VoIP call connection attempt signal transmitted from each of the plurality of subscriber stations, the PBX 20a receives the PSTN backup call attempt signal from the gateway 10a. The call connection attempt signal is transmitted to the PSTN network 40a connected to the PBX 20a.

The router 30a is a device that connects the gateway 10a and the IP network 50 and connects the network layers to each other, selects the most efficient path among several paths, and transmits and receives packets.

When the PSTN network 40a receives the call connection signal, the PSTN network 40a performs the call connection.

The IP network 50 receives the packet from the router 30a and transmits and receives the packet.

4 is a flowchart illustrating a call connection method of the VoIP network system of the present invention.

 The first gateway 10a determines whether a PSTN backup port designation process is necessary according to the subscriber service level of each of the plurality of subscribers connected to the plurality of PBXs 20a and 20b connected to the first gateway 10a (step S21).

If the subscriber service class does not require a PSTN backup, the subscriber does not designate a PSTN backup port, and if the subscriber service class requires a PSTN backup, the process proceeds to step S22.

If there is a subscriber in need of the PSTN backup port designation process of the first gateway 10a in step S21, the PSTN backup port designation process is performed to designate the PSTN backup port (step S22).

PSTN backup port designation process according to subscriber service level is performed as follows.

If the subscriber service class requires a PSTN backup but needs a PSTN backup via the PBX, the gateway designates a specific PSTN backup port as PBX.

In the case of a subscriber that requires a PSTN backup and a PSTN backup through a PSTN network directly connected to the gateway, a specific PSTN backup port of the gateway is designated as a PSTN network.

When a PSTN backup port of a gateway exists, a command for designating a PSTN backup port has the following format.

Setrerouteport a, b

In the present invention, when the first subscriber wants to designate the PSTN backup port to perform the PSTN backup via the second PBX 20b when the VoIP call connection through the IP network is impossible, a process for designating the PSTN backup port is performed. The command is:

In this case, it is assumed that the second PBX 20b is connected to the second port of the first slot of the first gateway 10a.

Setrerouteport 1,2

The first gateway 10a determines whether a VoIP call connection attempt signal is detected (step S23).

When the VoIP call connection attempt signal is detected from the first subscriber in step S23, the first gateway 10a determines whether the VoIP call connection through the IP network 50 is possible (step S24).

If it is determined in step S24 that the VoIP call connection through the IP network 50 is impossible, it is determined whether the PSTN backup is necessary by checking the service level of the first subscriber (step S25).

In step S25, when the first subscriber needs the PSTN backup, it is determined whether the PSTN backup port for performing the PSTN backup is designated (step S26).

The PSTN backup call attempt signal is transmitted to the PSTN backup port designated in step S26 to perform PSTN backup (step S27).

Upon receiving the PSTN backup call attempt signal in step S27, the second PBX 20b transmits a call connection attempt signal to the first PSTN network 40a interworking with the second PBX 20b and transmits the signal through the PSTN network 40a. The call connection is performed and the call connection method of the VoIP network system is terminated (step S28).

If it is determined in step S24 that the VoIP call connection through the IP network 50 is possible, the VoIP call connection of the first subscriber via the IP network 50 is performed and the call connection method of the VoIP network system is terminated (step S29).

If the specific PSTN backup port to perform the backup is not designated by step S26, the PSTN backup port is selected for the PBX 20a or 20b or the PSTN network 40a and the PSTN backup is performed through the selected PSTN backup port ( Step S210).

5 is a flowchart illustrating a call connection method of a VoIP network system when the PSTN backup port of the present invention is overloaded.

5 is a step S21 to step S27 of the call connection method of the VoIP network system of FIG. 4 when the PSTN backup port of the present invention is overloaded, and thus description thereof will be omitted.

If the subscriber wants to designate another PSTN backup port when the PSTN backup port is overloaded, a PSTN backup port designation process is performed to designate a plurality of PSTN backup ports (step S31).

Step S22 of FIG. 4 is replaced with step S31 of FIG.

If there is more than one PSTN backup port in the gateway, the command to specify the PSTN backup port has the following format.

Setrerouteport a, b <-first PSTN backup port

Setrerouteport a, c <-2nd PSTN backup port

In this case, when the PSTN backup port is designated, the subscriber first attempts to perform the PSTN backup through the first PSTN backup port when the subscriber cannot connect to the VoIP call over the IP network, and if the first PSTN backup port is busy, ), Automatically executes PSTN backup through the second PSTN backup port.

This configuration is basically required when there is more than one PSTN backup port, and this is used in case of problems or busyness of the PSTN backup port. It is used when there are multiple PSTN backup ports.

It is checked whether the first PSTN backup port is busy (step S32).

If the first PSTN backup port is busy, it is determined whether the second PSTN backup port is designated, and if the second PSTN backup port is designated, the process proceeds to step S34, otherwise the call connection method of the VoIP network system is terminated (step S33).

The PSTN backup is performed through the second PSTN backup port and the call connection method of the VoIP network system is terminated (step S34).

If PSTN backup is successfully performed through the first PSTN backup port designated by step S32, call connection is performed through the PSTN network, and the call connection method of the VoIP network system is terminated (step S35).

The VoIP call connection method is applicable to various PSTN backup line configurations in addition to the case where a plurality of PBXs and a PSTN network are connected to one gateway of FIG. 4.

For reference, a method of configuring a PSTN backup line includes a case where a plurality of PBXs are connected to one gateway, one or more PBXs and a PSTN network, and a case where the PBXs and one or more PSTN networks are connected.

When applied to a PSTN backup line configuration using an analog interface (Loop SL), it is utilized as follows:

Loop SL uses as many circuits as multiple channels.

Among these multiple circuits, a specific circuit that performs PSTN backup can be designated, so that a PBX using an analog interface can be connected to the gateway using only two circuits, and the other circuits can be used for other purposes. In addition, the PBX using the analog interface can be connected to the gateway using only two lines so that a plurality of PBXs using the analog interface can be connected to one gateway.

As described above, in the VoIP network system and the VoIP call connection method of the VoIP network system according to the present invention, the PSTN backup port is designated in advance according to the service class of the subscriber, and the PSTN backup is performed through the designated PSTN backup port. Differentiated services can be provided according to service class.

In addition, the VoIP call connection method of the VoIP network system and the VoIP network system can reduce the waste of resources of the VoIP network system by selecting whether to perform the PSTN backup according to the necessity of the PSTN backup.

1 is a block diagram of a conventional VoIP network system.

2 is a flowchart illustrating a call connection method of a conventional VoIP network system.

3 is an example of configuration of a VoIP network system of the present invention.

4 is a flowchart illustrating a call connection method of the VoIP network system of the present invention.

5 is a flowchart illustrating a call connection method of a VoIP network system when the PSTN backup port of the present invention is overloaded.

<Name of symbols for main parts of drawing>

10a, 10b: gateways 20a to 20c: private exchanges

30a, 30b: Router 40a, 40b: PSTN Network

50: IP network

Claims (5)

Connected to a plurality of subscriber stations and receives and transmits a VoIP call connection attempt signal of each of the plurality of subscriber stations, and when receiving a PSTN backup call attempt signal, performs a call connection attempt through a PSTN network connected to a corresponding private exchange. At least one private exchange; In case of a subscriber who needs PSTN backup according to the service class of each of the plurality of subscriber stations, after designating a private switch and / or a PSTN network as a PSTN backup port of the gateway, the VoIP call connection of each of the plurality of subscriber stations is performed. A gateway for performing a PSTN backup through the designated PSTN backup port if the subscriber's VoIP call connection fails; And And receiving a VoIP call connection signal transmitted from the gateway, wherein the router transmits a packet to a corresponding destination of the VoIP call connection signal through an IP network. The method of claim 1, wherein the gateway is After the PSTN backup port is designated as a predetermined number, if the first PSTN backup port is overloaded when performing PSTN backup through the first PSTN backup port, PSTN backup is performed through the second PSTN backup port. VoIP network system. A PSTN backup port designation step of designating a private switch and / or a PSTN network as a PSTN backup port of a gateway in case of a subscriber who needs PSTN backup according to a service class of a plurality of subscribers; A VoIP call connection attempt step, wherein the gateway attempts to connect the VoIP call through an IP network when detecting a VoIP call connection attempt signal from the plurality of subscribers; A VoIP call connection step of performing a VoIP call connection through the IP network when the gateway succeeds in attempting the VoIP call connection; And And performing a PSTN backup step of performing a PSTN backup through the PSTN backup port designated in the step of designating the PSTN backup port if the gateway fails to connect the VoIP call. The method of claim 3, wherein performing the PSTN backup A first step of checking, by the gateway, the class of the subscriber if the VoIP call connection attempt fails; And And if the PSTN backup port is specified in the first step, the gateway further comprises a second step of performing a PSTN backup through the PSTN backup port designated in the PSTN backup port designation step. How to connect. The method of claim 4, wherein the second step A third step of determining whether another PSTN backup port is designated when performing a PSTN backup through the designated PSTN backup port fails; And a fourth step of performing a PSTN backup through the other PSTN backup port if the other PSTN backup port exists by the PSTN backup port checking step.