KR100654376B1 - IP Base Communication System between PBX and Its Communication Method - Google Patents

Abstract

The present invention relates to a method of constructing an IP-based virtual private network (VPN) using tunneling technology in an ALL-IP (Internet Protocol) -based mobile communication network. Claims [1] A communication method for providing communication between private branch eXchanges (PBXs) using a local wireless network, comprising: a first step in which a call flows through a calling PBX connected to a calling party wireless network; A second step of determining whether the incoming call is a call for in-premises reception of the in-house wireless network or a call to be transmitted to a remote in-premises wireless network; A third step of establishing a PPTP tunneling session with the called party's wireless network by identifying routing information of the corresponding remote premises wireless network when the call is to be transmitted to the remote premises wireless network; A fourth step of allocating the resources for the incoming call processing in the called party's wireless network by transmitting the incoming call information to the called party's wireless network using the set PPTP tunneling session; And a fifth step of performing a call connection by receiving a call using a resource allocated in the fourth step to a called terminal in a called party PBX in the called party's wireless network.

IP, VPN, on-premises wireless network, PBX

Description

IP-based communication system between PCs and its communication method {IP Base Communication System between PBX and Its Communication Method}             

1 is a block diagram of an embodiment of a mobile communication system when a corporate subscriber uses a call service between remote PBXs according to the related art.

2 is a block diagram of an embodiment of an inter-PBX communication system for providing communication between PBXs through a virtual private network using an IP-based wireless network in accordance with an embodiment of the present invention.

3 is a timing diagram of a method of communication between PBXs in a system for providing communication between PBXs through a virtual private network using an IP-based campus wireless network according to an embodiment of the present invention.

4 is a timing diagram of a method of releasing communication between PBXs in a system for providing communication between PBXs through a virtual private network using an IP-based campus wireless network according to an embodiment of the present invention.

The present invention uses a tunneling technology in an ALL-IP (Internet Protocol) based mobile communication network between remote Public Switched Telephone Network (PSTN) networks linked to different trunk / media gateways. The present invention relates to a method of constructing an IP-based virtual private network (VPN).

1 is a configuration diagram of an embodiment of a mobile communication system when a corporate subscriber uses a call service between remote PBXs according to the related art.

Referring to FIG. 1, the mobile communication system according to the related art is in charge of interworking with the IP-based wireless network 100, the PSTN 170, the wireless network 100, and the private telephones 161 and 162. Private Branch eXchange (PBX) 141, 142, and PSTN 170, which provides normal wireline telephone service, and a wired switch 151, 152 for interworking the PBN 141, 142.

In this case, the premises wireless network 100 may transmit a signal and media traffic between a call agent 110 and a remote PSTN 170 for call processing in the premises wireless network. Gateway 130 for transmitting and receiving through the network and configuration information of the corporate wireless network of the corporate subscriber, IP address information of the call processing server 110 in the wireless network, and other operation information necessary for operation Corporate management information database (DB) 120.

In addition, the PBX (141, 142) is a telephone exchange system for all employees to share a certain number of external telephone lines used in the company, and to automatically connect the phone between the internal users connected to the extension, PBX (141) 142), the main goal is to reduce the cost of assigning a regular telephone line to all employees of a company. Therefore, the PBXs 141 and 142 are operated under their own responsibilities and are owned by the general corporation, not the telephone company.

Through the above configuration, in the past, a corporate operator uses a portion of a wired telephone network provided by a wired telephone network service provider to pay a certain rent and rents the PBXs 141 and 142 linked to the PSTN 170 for inter-branch call service. Intercommunication was used.

However, such a conventional system causes the irrationality of using a wired telephone network provided by a wired telephone network service provider for inter-branch call service even when an on-premises wireless network is established, and expenses by renting an expensive wired telephone network. There is a problem that causes a great burden on.

The present invention has been proposed to solve the above problems, using an existing wireless network based on the all-IP already configured without using the existing wired network for communication between the conventional branch office or remote PSTN network The purpose of the present invention is to provide a cheaper PBX communication system and a call processing method in the communication system by configuring a virtual private network through a public Internet network.

In addition, an object of the present invention is to propose a method using a tunneling protocol PPTP (Point-to-Point Tunneling Protocol) to configure a virtual private network using an ALL-IP-based wireless network.

In order to achieve the above object, the present invention provides a communication system for providing communication between PBXs (Private Branch eXchanges) in remote locations using an Internet Protocol (IP) -based wireless network. On-premises wireless network device that is linked to the other wireless network and at the same time interlocked with the PBX; A PBX connected to the premises wireless network device and interworking with a premises private wired network and for interfacing with a wired subscriber of the premises private wired network; And an IP switching device that connects to the wireless network in the other premises using a Point-to-Point Tunneling Protocol (PPTP), which is a tunneling protocol, for connection between remote PBXs through the wireless network device in the premises .

Meanwhile, the present invention provides a communication method for providing communication between remote branch eXchanges (PBXs) using an Internet Protocol (IP) -based wireless network. A first step in which a call is introduced; A second step of determining whether the incoming call is a call for in-premises reception of the in-house wireless network or a call to be transmitted to a remote in-premises wireless network; A third step of establishing a PPTP tunneling session with the called party's wireless network by identifying routing information of the corresponding remote premises wireless network when the call is to be transmitted to the remote premises wireless network; A fourth step of allocating the resources for the incoming call processing in the called party's wireless network by transmitting the incoming call information to the called party's wireless network using the set PPTP tunneling session; And a fifth step of performing a call connection by making a call using a resource allocated in the fourth step to a called terminal in a called party PBX in the called party premises wireless network.

The present invention may also include a sixth step of releasing the connected call when detecting a call release message while the PPTP session is connected; And a seventh step of terminating the PPTP session and releasing the resources allocated in the fourth step after the connected call is released.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the same components in the drawings are represented by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a configuration diagram of an inter-PBX communication system for providing communication between PBXs through a virtual private network using an IP-based wireless network in accordance with an embodiment of the present invention.

As shown in FIG. 2, an inter-PBX communication system that provides communication between PBXs through a virtual private network using an IP-based wireless network in accordance with an embodiment of the present invention is configured as an IP-based network and includes PBXs 241 and 242. And interworking with premises wireless networks 210-1 and 210-2, premises wireless networks 210-1 and 210-2 and premises private wired networks connected to other premises wireless networks 210-1 and 210-2. PBXs 241 and 242 for interfacing with wired subscribers 261 and 262, and IP-based switches 251 and 252 that are in charge of connection between respective wireless networks 210-1 and 210-2. And wired subscribers 261 and 262 subscribed to the premises private wired network.

In particular, when the configuration of the wireless network (210-1, 210-2) in more detail, the wireless network (210-1, 210-2) is composed of an IP network, by controlling the gateway (231, 232) Call Agency 211 and 212, which handles incoming calls from wired subscribers 261 and 262 through PBXs 241 and 242, and manages channel resources of gateways 231 and 232, for service operation. Call signal and data traffic coming from the wired subscribers 261 and 262 through the corporate operation information database (DB) 220 and the PBXs 241 and 242 having necessary management information. Gateways 231 and 232 for transmitting and receiving are included. In particular, the premises wireless network (210-1, 210-2) is connected through the session according to the PPTP, PBX (241, 242) connected to each of the premises wireless network (210-1, 210-2) is also the PPTP session It will be linked through.

In addition, the corporate operation information database 220 is the configuration information of the corporate wireless network (210-1, 210-2) of the corporate subscriber, the IP address of the call processing server in the wireless network (210-1, 210-2) Stores information, dial policy information for inter-branch calls, and other information required for service operations.

In this configuration, the IP-based virtual private network can reduce the burden of internal call processing by providing RASP (Remote Access Server Process) devices in the call processing servers 211 and 212.

In this case, the RASP device performs a function related to call processing from a point in time at which it is determined that a call introduced from the call processing servers 211 and 212 should be delivered to a premises wireless network at a remote location, and performs a PPTP session between the premises wireless networks. It performs a function of setting / release / managing, allocating / releasing resources of gateways 231 and 232 necessary for call setup, and converting information required for transferring call setting information between wireless networks in a remote area.

3 is a timing diagram of a method of communication between PBXs in a system for providing communication between PBXs through a virtual private network using an IP-based campus wireless network according to an embodiment of the present invention.

As shown in FIG. 3, according to an embodiment of the present invention, a communication method between PBXs in a system for providing communication between PBXs through a virtual private network using an IP-based campus wireless network may include firstly, a calling party wired subscriber ( 261 is initiated by calling a called party wired subscriber 262 located at a remote location.

That is, when the calling wired subscriber 261 dials to call the called subscriber 262 located at a remote location via the premises wireless network, the call flows into the calling call processing server 211 (301). At this time, the dial information used for dialing is previously set as a dial policy by the corporate subscriber and stored in the corporate management information database (DB) 220. For example, it may be in the form of "remote routing number + called party number", and the remote routing number may use the same remote routing number used when using a wired VPN network.

The originating call processing server 211, which detects the call inflow by the originating wired subscriber 261, examines the number of dialed digits (302) and manages the corresponding calling party processing server 211. It is determined whether to reach the subscriber in the premises or to the subscriber located at a remote location not managed by the corresponding caller server 211.

That is, if the number of dialed digits is larger than the length for the incoming call to the subscriber in the premises, the call processing server 211 is a remote routing number in the corporate management information database (DB) 220 that has the network subscriber information of the corporate subscriber. Check whether there exists (303). At this time, if the call processing server (211, 212) is provided with a RASP (Remote Access Server Process) device, the call processing server may be replaced with a RASP device in the following process.

And verify the validity of the remote routing number in the corporate management information database (DB) (220) (304), and if the remote routing number is valid, the calling party's call processing server 211 is a corporate management information database (DB) ( In step 305, information of a remote wireless communication network required for call processing is received.

The calling party processing server 211 requests a PPTP session connection from the called party's call processing server 212 to transfer call information between remote wireless communication networks (306).

The called party's call processing server 212 receiving the PPTP session connection request transmits the PPTP session connection's acceptance to the calling party's call processing server 211 (307).

The call originating server 211 allocates channel resources in the gateway 231 to be used for the corresponding call service (308).

The channel information, together with the call processing information, is transmitted to the called party's call processing server 212 through the PPTP session already established (309).

The called party's call processing server 212 allocates the channel resources in the gateway 232 to be used for the call service (310) and transmits the allocated channel information to the calling party's call processing server 211 through the PPTP session (311). ). After the above processing is completed, the called party's call processing server 212 attempts to receive the corresponding call to the called wired subscriber 262 (312).

Through the above process, a media traffic path (eg, an RTP session) between the gateways 231 and 232 located in the remote wireless communication network is generated (313). Then, communication between the PBXs established through the virtual private network is performed using the IP-based wireless network (314).

Then, call processing information generated between the calling party PBX 241 and the called party PBX 242 is transmitted through the PPTP session established between the local wireless networks 210-1 and 210-2.

4 is a timing diagram of a method for releasing communication between PBXs in a system for providing communication between PBXs through a virtual private network using an IP-based campus wireless network according to an embodiment of the present invention.

Referring to FIG. 4, a method of releasing communication between PBXs in a system for providing communication between PBXs through a virtual private network using an IP-based campus wireless network according to an embodiment of the present invention, first, the call of FIG. In the connected state 401, the calling wired subscriber 261 requests the call release for the called wired subscriber 262 (402). Although the call release request may be made by the called party wired subscriber 262, the following description exemplifies that the call release is made by the calling party wired subscriber 261.

The called wired subscriber 262 transmits the call release confirmation message to the calling wired subscriber 261 according to the call release request (403). The called wired subscriber 261 sends the call release completion message to the called wire. The call release operation is completed by forwarding to the subscriber 262 (404). At this time, the call release operation is performed while the PPTP session is connected.

The call processing servers 211 and 212 detect a call release request by detecting a call release completion message, which is a final call release message (405). The PPTP sessions set at the calling party and the called party are released (406, 407, 408, and 409).

That is, if a request for release is made with respect to the PPTP session established at the call processing server 211 or 212 detecting the call release request (406), and the call processing server 212 or 211 accepts it (407), By releasing channel resources allocated to the respective gateways 241 and 242 (408 and 409), a media traffic path (e.g., an RTP session) between the gateways 231 and 232 located in the remote wireless communication network is released. .

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited by the drawings.

As described above, the present invention is a virtual private network that is significantly cheaper than the wired virtual private network of the prior art, which leases and builds a wired network by providing an IP-based virtual private network (VPN) by using an Internet network that is already widely used. There is an effect that can be built.

In addition, since the IP-based virtual private network according to the present invention can use the scalability of the Internet as it is, the flexibility of network construction that can overcome the scalability and the complexity of network construction, which is a disadvantage when the existing wired virtual private network is built. There is an effect that can be provided.

In addition, the present invention has the effect of absorbing corporate subscribers using a wired virtual private network to a mobile communication network providing an on-premises wireless network using the prior art to induce a switch to a mobile communication network based on ALL-IP.                     

In addition, according to the present invention, as IP security technology is gradually developed, communication between remote PSTN networks using IP-based virtual private networks can be established with enhanced security technology.

Claims (9)

In a communication system for providing communication between private branch eXchange (PBX) using a wireless network based on the Internet Protocol (IP), An on-premises wireless network device configured as an IP-type network and linked with a PBX and connected to another on-premises wireless network; A PBX connected to the premises wireless network device and interworking with a premises private wired network and for interfacing with a wired subscriber of the premises private wired network; And IP-based, characterized in that it comprises an IP switching device for connecting to the other wireless network using the Point-to-Point Tunneling Protocol (PPTP), a tunneling protocol for the connection between the remote PBX through the wireless network device in the premises Communication system between PBXs. The wireless network device of claim 1, A corporate operation information database (DB) having operation information necessary for service operation; A gateway for transmitting and receiving a call signal and a data traffic signal flowing from the wired subscriber through the PBX; And And a call processing server that controls the gateway and the corporation operation information database to process the call signal and data traffic flowing from the wired subscriber through the PBX and to manage channel resources of the gateway. IP-based PBX communication system. The method of claim 2, wherein the operation information required for operating the service is: IP-based, characterized in that it comprises configuration information of the corporate wireless network of the corporate subscriber, IP address information of the call processing server in the premises wireless network device and dial policy information for the inter-branch call of the corporate Communication system between PBXs. delete The method of claim 2, wherein the call processing server, A function for performing a function related to call processing from a time point at which it is determined that a call introduced from the call processing server should be transmitted to the other premises wireless network, and setting / release / managing a PPTP session between remote premises wireless network devices; Allocating / releasing resources of the gateway required for call establishment; And A communication system between IP-based PBXs further comprising a RASP (Remote Access Server Process) device for performing information conversion function required for transferring call setup information between remote campus wireless networks. In the communication method for providing communication between a private branch eXchange (PBX) of a remote location using an Internet Protocol (IP) -based wireless network, A first step of introducing a call through a calling party PBX connected to a calling party premises wireless network; A second step of determining whether the incoming call is a call for in-premises reception of the in-house wireless network or a call to be transmitted to a remote in-premises wireless network; A third step of establishing a PPTP tunneling session with the called party's wireless network by identifying routing information of the corresponding remote premises wireless network when the call is to be transmitted to the remote premises wireless network; A fourth step of allocating the resources for the incoming call processing in the called party's wireless network by transmitting the incoming call information to the called party's wireless network using the set PPTP tunneling session; And And a fifth step of performing a call connection by making a call using a resource allocated in the fourth step to a called terminal in a called party's PBX in the called party's wireless network. The method of claim 6, wherein the second step, Based on the number of digits of the incoming number of the incoming call based on the number of digits (digits) between the IP-based PBX characterized in that it is determined whether the call for the premises in the premises wireless network or the call to be delivered to the remote premises wireless network Communication method. delete The method of claim 6, A sixth step of releasing the connected call when detecting a call release message while the PPTP session is connected; And And a seventh step of terminating the PPTP session and releasing the resources allocated in the fourth step after the connected call is released.

Images