KR100265856B1 - Method for providing virtual tunnel using outgoing trunk call control procedures at NNI - Google Patents

Abstract

PURPOSE: A method for supplying a virtual tunnel using an outgoing call control process in an NNI(Network-Node Interface) is provided to supply a virtual tunnel(i.e. network-network virtual path) between two exchanges using an outgoing call control process of a BISUP(B-ISDN(Broadband-Integrated Services Digital Network) User Part) in an NNI, so as to improve the efficiency of network resources. CONSTITUTION: A main processor of a TCCF(Trunk Connection Control Function)(TCCF-main) generates an outgoing trunk virtual path connection control child process(TCCF-vpogt), and an IAM(Initial Address Message) for the establishment of a virtual tunnel, according to a virtual tunnel setup request from am originating exchange manager. The TCCF-vpogt receiving a main-to-child IAM(IAM-mc) for setting up a virtual tunnel from the TCCF-main translates a dialing code of an incoming exchange number, and receives the notification of an outgoing path. The TCCF-vpogt pages a system library of an NLRHF(Network Link Resource Handling Function) to allocate an outgoing band and a virtual channel ID, and extracts internal switch link path information from an SLRHF(Switch Link Resource Handling Function) to deliver the IAM to a relaying exchange or the incoming exchange, then an initial address acknowledge message awaiting state(Await-IAA(IAM Acknowledge)) is returned. If the IAA is received from the relaying exchange or the incoming exchange, a point-to-point connection establishment request message(PtP-ConnEstabRQ) is delivered to a TIMC(Trunk Interface Module Controller), to register VPI(Virtual Path Identifier), VCI(Virtual Channel Identifier), network control parameter information and an internal switch link path information, and a virtual tunnel establishment completion answer message awaiting state(Await-ANM(Answer Message)) is returned. If the ANM is received from the relaying exchange or the incoming exchange, a message(VP-EstabSigAck) informing the completion of virtual channel establishment between the originating and incoming exchanges to the originating exchange manager, to transfer the state of the virtual tunnel to a conversation state. Virtual channel connection is released, according to a virtual channel release request of the manager of the originating/incoming exchange.

Description

Method for providing virtual tunnel using outgoing trunk call control procedures at NNI}

The present invention relates to a method for providing a virtual path using an outgoing call control procedure at a network-network interface of an Asynchronous Transfer Mode (ATM) switching system, and in particular, a broadband integrated information network (B-ISDN). In the case of the Digital Network, the administrator of the local exchange requests the establishment of a virtual tunnel (ie, network-network virtual path) between the originating exchange and the destination exchange. In the Network-Node Interface, the BISIS User Part (BISUP), which is a trunk line signaling protocol, is used to set the virtual path (network-network virtual path) that is relayed between the source and destination exchanges. It is about a method to provide.

The transparency connection that the ATM layer provides to the upper layer is called an asynchronous transfer mode connection, which is connected between endpoints by a chain of connection elements.

There are two types of ATM connections: Virtual Channel (VC) and Virtual Path (VP).

The virtual channel VC refers to a logical unidirectional coupling between link ends carrying an ATM cell, and the virtual path VP refers to a logical combination of virtual channels VC.

One virtual channel identifier (VCI) is assigned to the virtual channel VC, and one virtual path identifier (VPI) is assigned to the virtual path VP.

Within the virtual path VP there may be different virtual channel (VC) links, which are distinguished from each other by the virtual channel identification number (VCI) assigned to each of them.

Meanwhile, among the virtual channels VC belonging to different virtual paths VP, virtual channel identification numbers VCI may be the same. Therefore, one virtual channel VC can be fully identified only by combining the corresponding virtual path identification number VPI and the virtual channel identification number VCI.

Virtual path (VP) is a general term for a bundle of virtual channel links (VCLs), where all virtual channel links (VCLs) in the bundle have the same endpoint.

An ATM cell is explicitly assigned a virtual path identification number (VPI) for a virtual path (VP), which identifies a group of virtual channel (VC) links that share the same virtual path (VP).

Each time a virtual path (VP) is exchanged in an ATM network, a specific virtual path identification number (VPI) is assigned. Virtual Path Link (VPL) refers to the unidirectional ability to transport an ATM cell between two ATM entities whose value is translated into a Virtual Path Identification Number (VPI). Is generated by assigning a virtual path identification number (VPI) value and terminates when the virtual path identification number (VPI) is removed.

In the virtual path (VP) level, a virtual path (VP) is provided to transfer information between user-user, user-network, and network-network.

When the virtual channel VC is exchanged, the virtual path VP supporting the input virtual channel link is terminated first, and a virtual path VP supporting the output virtual channel link is newly created. The application of the virtual path (VP) is as follows.

First, the user-to-user virtual path (VP) is set between the T _B or S _B reference points and provides the user with the virtual path (VP). ATM network elements transport all cells related to this virtual path (VP) through the same route. Corresponding virtual path identification numbers (VPIs) are translated in ATM network elements that provide cross linking or switching functions.

Second, the user-network virtual path (VP) is established between the T _B or S _B reference point and the network node, and is used to collectively connect user devices to the network element.

Third, a network-to-network virtual path (VP) is established between two network nodes, which is applied to network traffic management or route assignment. In the network node where the virtual path VP is terminated, the virtual channels VC in the virtual path VP are exchanged or cross-connected with the virtual channels VC in the other virtual path VP.

The trunk line signaling protocol (BISUP) originally defined a call control procedure for establishing a virtual channel at the network-to-network interface (NNI). Since the virtual channel (VC) needs to establish a connection whenever the calling user requests, it must repeatedly perform connection control such as network resource allocation and internal switch path.

Therefore, there is an overhead of repeating the same operation when it is necessary to set up a virtual channel (VC) using the same path. In addition, since the quality of service (QoS) of the required virtual channel (VC) is different from the QoS of the virtual channel (VC) already set in the transmission link, the quality of service of the existing virtual channel connection is reduced. In order to satisfy the QoS of the new virtual channel (VC) while maintaining it, it is necessary to calculate network resources that can be allocated in consideration of all virtual channels (VC) in the transport link, which requires a lot of time and effort required for network resource allocation.

In order to solve this problem, in case of using the virtual path, the virtual path (VP) bundles the virtual channels of the same route into a bundle so that only ATM cell switching can be performed with the virtual path identification number (VPI). No connection control is required for the virtual channel (VC) that requires.

In addition, since a network resource necessary for the virtual path VP is reserved in advance, when the virtual channel VC is set through the virtual path VP, network resource allocation required for setting the virtual channel VC is performed within a short time. can do.

Currently, the application of the virtual path (VP) that can be set using the signaling protocol is limited to the user-user virtual path, and the user-network and network-network virtual paths can be set only by the exchange administrator.

Conventionally, since the setting of the virtual path (VP) can be set only in the form of a semi-permanent or permanent virtual path (PVP) by the exchange manager without a signaling procedure, a subscriber for the virtual path (VP) setting is required. Much information, time, and effort were required on information, topology and configuration.

Therefore, there was a problem that a new virtual path (pe) could not be created immediately when the exchange manager or user wanted.

To address this, the International Organization for Standardization added signaling capabilities for establishing virtual paths (VPs) in subscriber signaling protocols (DSS2) and trunk line signaling protocols (BISUP). Add Virtual Path (VP) bearer class (BC) to Broadband Bearer Capability (BBC) which is an information element, and ignore virtual channel identification number (VCI) in connection identification number information element and virtual path identification number (VPI) only performs connection control.

This signaling protocol performs the virtual path setup procedure only if the transmission class is virtual path (VP), and the transmission class is not the virtual path, and is connected with BCOB-ABroadband Connection Oriented Bearer-A and broadband. In case of the connection type forwarding service type-C (BCOB-C) and the connection type forwarding service type-X (BCOB-X: Broadband Connection Oriented Bearer-X), the existing virtual channel setup procedure is performed. do.

However, the application of virtual paths (VPs) that can be established using this signaling protocol is limited to user-user virtual paths. To extend the user-user virtual path setting function, the virtual path forwarding class is expanded into three types: user-user virtual path (same as the existing virtual path forwarding class), user-network virtual path, and network-network virtual path. It was.

The biggest difference between the user-user virtual path and the network-network virtual path is shown in Table 1 below.

By the way, a semi-permanent or permanent virtual path (PVC) that is set up between two exchanges (incoming and outgoing exchanges) or between two exchanges via one or more relay exchanges is specifically called a virtual tunnel. As described above, a lot of information is required for setting, and the allocated network resources (bands) are fixed, so when a band is to be changed, the virtual path must be released and then reset.

Therefore, by establishing a network-network virtual path (VP), which is a virtual path between two exchanges, using a relay line signaling protocol (BISUP), a method for providing a virtual path (network-network virtual path) between two switching periods is provided. It is required.

Accordingly, the present invention has been made to solve the problems described above, using the outgoing call control procedure of the relay line signaling protocol (BISUP) in the network-network connection (virtual path of the two exchange periods (network-network virtual) It is an object of the present invention to provide a method for providing a virtual path for improving the efficiency of network resources.

1 is an explanatory diagram comparing a network-manganese virtual path and a user-user virtual path to which the present invention is applied.

Figure 2 is a block diagram schematically showing the configuration of an asynchronous delivery mode switching system to which the present invention is applied.

3 is a processing block diagram for providing a virtual path using an outgoing call control procedure of the asynchronous delivery mode switching system according to an embodiment of the present invention.

4 is an explanatory diagram showing a relay line signal protocol message processing procedure for setting up a virtual path using an outgoing call control procedure according to an embodiment of the present invention;

5A to 5G are flowcharts illustrating a method for providing a virtual passage using an outgoing call control procedure according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

300 to 302: switch link resource management processing block

310 to 312: station number translation block

320 to 322: network link resource management processing block

330 to 332: broadband signal connection processing block

340, 341: subscriber service designated coordination processing block

350, 351: subscriber connection block

360, 361: subscriber connection control block

370: trunk line service specified adjustment processing block

380: MTP signaling message processing block

381 relay connection connection block 382 relay connection control block

390: number translation block 391: routing control block

In order to achieve the above object, the present invention provides a method for providing a virtual path (network-network virtual path) using an outgoing control procedure between originating and switching exchanges in an asynchronous delivery mode (ATM) switching system. The main processor TCCF_main of the trunk line control block generates an outgoing virtual path connection control child process TCCF_vpogt and generates an initial address message IAM for setting up the virtual path according to a virtual path setting request from the terminal. Stage 1; The outgoing virtual path connection control child processor TCCF_vpogt having received the virtual path establishment initial address message IAM_mc from the main processor TCCF_main of the relay line control block performs translation of the station number of the destination exchange number according to a request for setting up the virtual path. Perform an outgoing route notification, call a system library of a network link resource management processing block (NLRHF) to assign an outgoing band and virtual channel identification number, and switch the internal switch link from the switch link resource management processing block (SLRHF). A second step of extracting path information and transferring the initial address message IAM to the relay switch or the destination switch and transitioning to the initial address response message wait state Await_IAA; When the initial address response message (IAA) is received from the relay switch or the destination switch, the point-to-point connection setup request message (PtP_ConnEstabRQ) is transmitted to the relay line connection module controller (TIMC), and the virtual path identification number (VPI) and the virtual channel are transmitted. A third step of registering an identification number (VCI), network control parameter information, and internal switch link path information, and transitioning to a virtual path establishment complete response message waiting state (Await_ANM); When receiving the virtual path establishment complete response message (ANM) from the relay exchange or the destination exchange, a message (VP_EstabSigAck) is transmitted to the originating exchange manager informing that the establishment of the virtual path is completed between the originating exchange and the destination exchange. A fourth step of transitioning the state to the busy state; And a fifth step of releasing the virtual passage connection in the busy state according to the call release request of the originating exchange exchange manager.

In the ATM switching system, when the originating exchange manager of the B-ISDN of the local station requests the establishment of the virtual path at the network-network interface (NNI), the network that is broadcast from the network-network interface by extending the BIPATH virtual path setting function By providing the network virtual path (virtual path), the ATM virtual channel connection service can be provided through the established virtual path without performing additional connection control procedure between the source and destination exchanges, thereby reducing the call setup processing time. In addition, it is possible to easily set and release the virtual path using the relay line signal protocol, and to change and delete the band according to the bandwidth utilization rate of the virtual path, thereby increasing network resource efficiency.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an explanatory diagram comparing the concept of a network-network virtual path and a user-user virtual path to which the present invention is applied.

As shown in FIG. 1, the user-user virtual path refers to a virtual path (VP) between the broadband general information network terminal and the broadband comprehensive information network terminal, and the network-network virtual path is a relay exchange period or relay period. Period of exchange and incoming exchange, or outgoing exchange and incoming exchange.

A virtual path (VP) is a network manager that establishes a virtual path (network-network virtual path) for a subscriber of a broadband integrated telecommunication network using a relay line signaling protocol when a subscriber of the broadband integrated telecommunication network requests setting up a virtual channel (VC). It is an object of the present invention to easily set a virtual channel (VP) setting between the calling subscriber and the called subscriber by setting in advance.

The virtual path (VP) can be set up between user-user, user-network, and network-network. The present invention provides network-network virtual paths which are relayed using relay line signaling protocol, especially at network-network interface (NNI). By providing a between the originating exchange and the destination exchange, it is intended to replace a permanent virtual path that is purely set up by the exchange manager without using signaling protocols.

The use of a preset virtual path (network-network virtual path) between the originating and destination exchanges eliminates the need for additional connection control for the virtual channels using this virtual path.

Figure 2 is a block diagram schematically showing the configuration of an asynchronous transfer mode (ATM) switching system to which the present invention is applied.

As shown in FIG. 2, an ATM switching system basically includes an ATM Local Switching Subsystem (ALS) 210, 220, and 230 and an ATM Central Switching Subsystem (ACS) 200. .

The ATM local switching sub-systems 210, 220, and 230 operate together with the ATM central switching sub-system 200 as a concentrating device having a constant collecting ratio. Accordingly, the ATM central switching subsystem system 200 acts as a distribution device that performs the interconnection function between the ATM local switching subsystem systems 210, 220, and 230. In addition, the ATM local switching sub-system (210, 220, 230) is the ATM local switching sub-system / broadband integrated information network subscriber (ALS / S: ALS / BISDN Subscriber) 220 for user registration of the broadband integrated telecommunication network users, for network matching ATM Local Switching System / Wideband Telecommunications Network Trunk Line (ALS / T: ALS / BISDN Trunk) 210, and ATM Local Switching System / Wideband Integrated Telecommunication Network Subscriber and Relay Line (ALS / T) ST: ALS / BISDN Subscriber and Trunk) 230.

As a concentrator, the ATM local switching sub-system / broadband integrated information network subscriber (ALS / S) 220 sets the number of user-side links to n (155 Mbps), and switches (side the ATM central switching sub-system 200) side links. It can have a collection ratio of n * m in which the number m.

Accordingly, the ATM central switching unit system 200 translates the called number in case of own station and incoming call / connection in call / connection control, and routes for each relay line in case of outgoing call / connection. Perform control.

In addition, the ATM central exchange system 200 has an operation and maintenance processor (OMP) 201 for operation and maintenance of the entire system, as well as system-wide maintenance, testing, measurement and statistical functions. Perform various input / output control functions with the operator.

3 is a processing block diagram for providing a virtual path using an incoming call control procedure of an asynchronous transfer mode (ATM) switching system according to an embodiment of the present invention.

As shown in FIG. 3, a system library block includes a switch link resource handling function (SLRHF) 300, 301, 302 and a number translation in ALS function (NTLF). 310, 311, 312, and a Network Link Resource Handling Function (NLRHF) (320, 321, 322).

The switch link resource management processing block (300,301,302) is a block for generating internal switch link path setting and route information of ATM cell header (VPI, VCI), and the station number translation block (310,311,312) is called A block for performing a station number translation of a number, and the network link resource management processing blocks 320, 321, and 322 are blocks for processing VPI, VCI, band allocation, and band management of a relay line link at a network-network interface.

In addition, the Broadband Signaling Interface Function (BSIF) 330, 331 and 332 functions to control and manage a signaling connection for reliable transmission of ATM call / connection control messages.

A subscriber service specific coordination function (SSCF) 340, 341 may be configured to transmit a subscriber signal message with a BSIF (330, 331, 332) and a user connection access block (UCIF: User Connection). Interface Function (350, 351) performs an adjustment function.

In addition, the subscriber connection access blocks (UCIFs) 350 and 351 perform access functions of subscriber signal messages.

In addition, a user connection control function (UCCF) 360,361 performs subscriber call / connection control.

Also, trunk service specific coordination function (TSCF) 370 is used to transmit the trunk line signal message to BSBS 330, 331, 332 and MTP signal message processing block (SMHF: MTP). -3 performs an adjustment function between signaling message handling functions (380).

In addition, the MTP signal message processing block (SMHF) 380 performs an MTP-3 function among No. 7 signaling methods.

In addition, a trunk line connection connection block (TCIF) 381 is an MTP signal between the MTP signal message processing block (SMHF) 380 and a trunk line connection control block (TCCF) 382. Perform message passing.

In addition, the trunk line connection control block (TCCF) 382 performs the BISUP call / connection control.

There are a number translation block (NTCF) for receiving called number translation (NTCF) 390 and a routing control block (RTCF) 391 that performs routing control.

4 is an explanatory diagram illustrating a relay line signal protocol message processing procedure for setting a virtual path using an outgoing call control procedure according to an embodiment of the present invention.

As shown in Fig. 4, the establishment of the virtual passage begins by the originating exchange manager sending a VP_EstabRQ message requesting the establishment of the virtual passage. Trunk Connection Control Function (TCCF) that receives VP_EstabRQ message creates outgoing Trunk Virtual Path Connection Control Process (TCCF_vpogt) that performs network-network virtual path setup -Information necessary for network virtual path setting is transferred to TCCF_vpogt by loading in initial address message (IAM). TCCF_vpogt analyzes the destination number information of the IAM_mc message and transmits an initial address message requesting the establishment of the network-network virtual path to the relay or destination exchange.

Receiving a response to the request for establishing a virtual path from the relay or terminating exchange, TCCF_vpogt transfers cell header information for delivery of a user cell to a trunk interface module controller (TIMC) to convert the cell header. When assigned to a table and receiving an answer message (ANM: Answer Message) at the power exchange, the setup of the virtual path (network-network virtual path) between the originating and destination exchange is completed and the status of the virtual path is conversation. Transition to

The release of the virtual path is initiated by delivering a VP_RelRQ message to TCCF_vpogt or TCCF_vpict at the request of the originating or terminating exchange manager. The release of the virtual paths includes the bands of the virtual paths where TCCF_vpogt or TCCF_vpict is busy, the virtual path connection number (VPCI), the virtual path number (VPI), and the return of internal switch link path information and cell headers. Delete the conversion table and exit.

5A to 5G are flowcharts illustrating a method for providing a virtual passage using an outgoing call control procedure according to an embodiment of the present invention.

As shown in Fig. 5A, TCCF_main, which is the main process of the trunk line connection control block located in the outgoing asynchronous delivery mode local switching unit at the network-network interface (NNI), is determined by the manager of the originating exchange. The procedure of creating TCCF_vpogt for the VP_EstabRQ message delivered to request configuration and generating and forwarding the initial address message is performed by the administrator of the originating exchange with the primary process of the relay line connection control block idle (500). Upon receiving the required VP_EstabRQ message (501), it is determined whether the delivery class is a virtual path (502), and if the delivery class is not a virtual path, an outgoing virtual channel connection control child process is created (507), and the delivery class is virtual. If it is a path, an outgoing virtual path connection control child process is created (503).

After the relay line connection control main process generates an initial address message (504), sends an initial address message to TCCF_vpogt (505) and remains idle (506).

Hereinafter, the trunk connection control main process is TCCF_main, the incoming trunk virtual path connection control child process is TCCF_vpict (Incoming Trunk Virtual Path Connection Control Child Process), and the outgoing trunk virtual path connection control child process. ) Is denoted TCCF_vpogt.

When the generated TCCF_vpogt receives an initial address message (Main-to-Child IAM, IAM_mc) requesting the establishment of a virtual path from the TCCF_main in idle state (510), it calls the station number translation block and translates the station number (511). 512), the relay line resource management processing block is allocated a band and a virtual channel number for outgoing transmission (513), and after the outbound path is specified by calling the routing control block (514), the switch link resource management processing The block is called to establish an internal switch link path (515).

If all of the above procedures are performed successfully, TCCF_vpogt forwards the initial address message to the relay or destination exchange (516) and transitions to the initial address response message wait state (Await_IAA) (517).

When TCCF_vpogt receives the initial address message from the relay or terminating switch in the Await_IAA state (517) (518), the TCCF_vpogt passes the connection identifier and information message for network parameter control to the relay line connection module controller (519). After the process is created (520), the state transitions to the response message waiting state (Await_ANM) (521).

When TCCF_vpogt receives a response message (Answer, ANM) from the destination exchange (521) in the Await_ANM state (521), after delivering a VP_EstabRP message (524) to inform the administrator of the originating exchange that the establishment of the requested virtual path has been completed (524), Transition to conversation (525).

At this point, a call control procedure may be performed for a request for setting a virtual channel passing through the set virtual passage.

The release procedure of the virtual channel may be performed by an administrator request of the originating or terminating exchange. First, the release procedure of the request of the originating exchange manager may be performed when the administrator TCCF_vpogt receives a VP_RelRP message (531), before the virtual channel is released. In operation 532, the virtual channel exists in the path, and if the virtual channel exists, the virtual channel is released first, and then the release procedure of the virtual path is started (533).

If there is no virtual channel in the virtual path, TCCF_vpogt calls the system library of the switch link resource management processing block to release the internal switch path corresponding to the virtual path (534) and requests the relay line connection module controller to release the connection identifier. (536).

In addition, the outgoing route (route) and the band to the destination exchange to which the message is sent to the routing control block is released (536), and the relay line resource management processing block is called to allocate the outgoing link band and virtual The path number is released (537).

In order to request the release of the virtual passage to the relay or destination exchange, the virtual passage release request message REL is transmitted (538), and the virtual passage release complete (Release Complete, RLC) is transferred to the wait state (Await_RLC) (539). ).

When the TCCF_vpogt receives a virtual path release completion message notifying the completion of the release of the virtual path from the relay or destination exchange (540), the TCCF_vpogt transfers the VP_RelRP to the originating exchange manager (550) and terminates (560).

When performing the procedure for releasing the virtual channel at the request of the destination exchange manager, when TCCF_vpogt receives the virtual path release request message from the relay or destination exchange in the busy state 571 (572), before the virtual channel is released. It is checked whether the virtual channel exists in the virtual passage (573), and as a result, if the virtual channel exists, the virtual channel is first released, and then the release procedure of the virtual passage is started (574).

TCCF_vpogt calls the system library of the switch link resource management processing block to release the internal switch link path corresponding to the virtual path (575), and requests the release of the connection identifier to the trunk line connection module controller (576).

After releasing the outgoing route and the band allocated to the routing control block (577), the relay line link resource management processing block is called to release the band and the virtual path number assigned to the outgoing link (578). In step 579, the VP-RelSigAck is transmitted to the originating exchange manager, the virtual path release completion message is notified to the relay or destination exchange that the release of the virtual path is completed (580), and the TCCF_vpogt ends (581).

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 to the drawing.

The present invention as described above, by using the relay line signal protocol to set the virtual path (network-network virtual path) for the broadband integrated information network network subscriber in advance, it is easy to establish a virtual channel between the calling party and the called party, The use of a pre-configured virtual path between the originating and destination exchanges eliminates the need for additional connection control for virtual channels using this virtual path, and is simpler to connect and disconnect than the existing virtual connection type of permanent path. Since the destination number of the destination exchange only needs to be known, the same effect can be obtained by using relatively little information.

In addition, since the band of the virtual path can be easily changed using the band change function of the relay line signal protocol (BISUP), the procedure is greatly simplified compared to the conventional method of releasing and resetting the virtual path.

Claims (4)

A method for providing a virtual path (network-network virtual path) using an outgoing control procedure between an originating and receiving exchange in an asynchronous delivery mode (ATM) switching system, In response to a request for establishing a virtual path from the originating exchange manager, the main processor TCCF_main of the trunk line control block generates an outgoing virtual path connection control child process TCCF_vpogt and generates an initial address message IAM for setting up the virtual path. Generating a first step; The outgoing virtual path connection control child processor TCCF_vpogt having received the virtual path establishment initial address message IAM_mc from the main processor TCCF_main of the relay line control block performs translation of the station number of the destination exchange number according to a request for setting up the virtual path. Perform an outgoing route notification, call a system library of a network link resource management processing block (NLRHF) to assign an outgoing band and virtual channel identification number, and switch the internal switch link from the switch link resource management processing block (SLRHF). A second step of extracting path information and transferring the initial address message IAM to the relay switch or the destination switch and transitioning to the initial address response message wait state Await_IAA; When the initial address response message (IAA) is received from the relay switch or the destination switch, the point-to-point connection setup request message (PtP_ConnEstabRQ) is transmitted to the relay line connection module controller (TIMC), and the virtual path identification number (VPI) and the virtual channel are transmitted. A third step of registering an identification number (VCI), network control parameter information, and internal switch link path information, and transitioning to a virtual path establishment complete response message waiting state (Await_ANM); When receiving the virtual path establishment complete response message (ANM) from the relay exchange or the destination exchange, a message (VP_EstabSigAck) is transmitted to the originating exchange manager informing that the establishment of the virtual path is completed between the originating exchange and the destination exchange. A fourth step of transitioning the state to the busy state; And A fifth step of releasing a virtual aisle connection that is in a busy state according to a request for releasing a virtual aisle by an originating exchange manager; Method of providing a virtual passage using the outgoing call control procedure in the network-network interface comprising a. The method of claim 1, The second step, A sixth step of the outgoing virtual path connection control child processor TCCF_vpogt receiving an initial address message IAM_mc requesting the establishment of a virtual path from the main processor TCCF_main of the relay line control block; The outgoing virtual path connection control child processor calls a station number translation block (NTLF) to translate the station number, and calls a network link resource management processing block (NLRHF) to receive a band and a virtual channel number for outgoing transmission. A seventh step of calling an assignment control block (RTCF) to designate an outgoing route, and then calling a switch link resource management processing block (SLRHF) to set an internal switch link path; And An eighth step in which the originating virtual path connection control child process delivers an initial address message (IAM) to the relay or destination exchange and transitions to an initial address response message wait state (Await_IAA). Method of providing a virtual passage using the outgoing call control procedure in the network-network interface comprising a. The method according to claim 1 or 2, The process of releasing the virtual passage of the busy state at the request of the originating exchange manager of the fifth step, A ninth step of the outgoing virtual path connection control child processor TCCF_vpogt receiving a virtual path release message VP_RelSig from an originating exchange manager; Point-to-point connection establishment request message for calling the system library of the switch link resource management processing block (SLRHF) to release the internal switch link path in use and requesting the relay line connection module controller (TIMC) to delete the cell header conversion table. PtP_ConnEstabRQ) Send and Point-to-Point Connection Setup Response Message (PtP_ConnEstabRP) Receive Procedure and Routing Control Block (RTCF) Require Outgoing Route and Release of Band; Call Network Link Resource Management Processing Block (NLRHF) A tenth step of releasing a band allocated to the outgoing link and the virtual channel identification number (VCI); An eleventh step of transmitting a virtual path release request message (REL) requesting the release of a virtual path to the relay or originating exchange and transitioning to a virtual path release completion wait state (Await_RLC); And In the virtual channel release completion (RLC) wait state (Await_RLC), upon receiving a virtual path release completion message (RLC) from the relay exchange or the originating exchange, a message (VP_RelSigAck) notifying the manager of the originating exchange to complete the virtual passage release. 12th step to deliver and exit Method of providing a virtual passage using the outgoing call control procedure in the network-network interface comprising a. The method according to claim 1 or 2, The process of releasing the virtual passage in the busy state according to the request of the destination exchange manager of the fifth step, A ninth step of the outgoing virtual path connection control child processor (TCCF_vpogt) receiving a virtual path release request message (REL) requesting the release of the virtual path from the relay switch or the originating switch; Point-to-point connection establishment request message for calling the system library of the switch link resource management processing block (SLRHF) to release the internal switch link path in use and requesting the relay line connection module controller (TIMC) to delete the cell header conversion table. PtP_ConnEstabRQ) Send and Point-to-Point Connection Setup Response Message (PtP_ConnEstabRP) Receive Procedure and Routing Control Block (RTCF) Require Outgoing Route (Route) and Band Release and Call Network Link Resource Management Processing Block (NLRHF) A tenth step of releasing a band allocated to the outgoing link and the virtual channel identification number (VCI); And An eleventh for transmitting the virtual path release completion message (RLC) to the relay exchange or the originating exchange and sending a message (VP_RelSigAck) to notify the originating exchange manager of the completion of the virtual path release completion and ending the release of the virtual path; step Method of providing a virtual passage using the outgoing call control procedure in the network-network interface comprising a.

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