KR20070028770A - System and method for interfacing networks - Google Patents

Abstract

A network interworking system and a method thereof are provided to process 480 traffic channels by implementing an "nB + D" system, using one D channel resource for 16 traffic E1 lines, in ISDN PRI(SL1) signaling. A communication system comprises a PSTN exchange(100), a PBX(Private Branch Exchange)(200), and a network interworking part(300). The PSTN exchange(100) provides a voice information switching service through a circuit-switched method, and uses SS7 signaling. The PBX(200) controls calls received/transmitted to/from the PSTN exchange(100), provides a voice information switching service with an external subscriber, and uses ISDN PRI(SL1) signaling. The interworking part(300), installed in the PBX(200), converts signals of SS7 signaling and signals of ISDN PRI(SL1) signaling. If a fault occurs in a D channel(421) in operation, the network interworking part(300) automatically switches the D channel(421) into a backup channel(422). Two SS7 signaling channels(411,412) connect the PSTN exchange(100) with the interworking part(300). Two ISDN PRI(SL1) signaling channels(421,422) connect the PBX(200) with the interworking part(300). The D channel(421) processes 16 traffic E1 lines, or a maximum of 480 traffic channels.

Description

Network interworking system and method {SYSTEM AND METHOD FOR INTERFACING NETWORKS}

1 is a block diagram showing the configuration of a conventional communication system.

2 is a block diagram showing a configuration of a communication system according to an embodiment of the present invention.

Figure 3 is a block diagram showing the hardware configuration of the network interlocking unit according to an embodiment of the present invention.

Figure 4 is a block diagram showing a network linkage software configuration according to an embodiment of the present invention.

5 is a flowchart showing a procedure of processing a call control message according to an embodiment of the present invention.

6 is a flowchart illustrating a procedure for processing a message for requesting block and unblock for each channel according to an embodiment of the present invention.

7 is a flowchart illustrating a procedure of processing a message for requesting block and unblock for a channel in a trunk group according to an embodiment of the present invention.

8 is a flowchart illustrating a procedure of processing a message for requesting a reset for each channel and a channel of a trunk group according to an embodiment of the present invention.

<Explanation of Signs of Major Parts of Drawings>

100: public switched telephone network (PSTN) exchange 200: private exchange (PBX)

300: network linking unit 310: main control unit

320: Ethernet interface unit 330: E1 matching unit

411, 412: SS7 signal channel 421, 422: ISDN PRI signal channel

510: signal conversion unit 520: SS7 signal processing unit

530: ISDN PRI signal processing unit 540: OMC

The present invention relates to a communication system, and more particularly, to a system and method for interworking a network using different signaling methods (eg, SS7 signaling and ISDN PRI (SL1) signaling).

1 is a block diagram showing the configuration of a conventional communication system.

As shown, the conventional communication system includes a public switched telephone network (PSTN) switch 10, a private branch exchange (PBX) 20, and a network interworking unit 30.

The PSTN switch 10 provides a voice information exchange service through a circuit switching method, and uses a signaling system No. 7 (SS7) signaling method.

The PBX 20 is installed in a building or a certain area and controls external subscribers, such as analog phones or digital phones, by controlling internal calls, incoming calls from the PSTN, and outgoing calls to the PSTN switch 10. It provides voice information exchange service with ISDN PRI (ETSI / QSIG, SL1) signaling system.

The network interworking server 30 interlocks the PSTN switch 10 and the PBX 20, and more specifically, the SS7 signaling method used in the PSTN switch 10 and the ISDN PRI (ETSI / QSIG) signal used in the PBX 20. Link the method. Here, the SS7 signaling method refers to a signaling method for transmitting and receiving signal information by using an E1 line 42 for an SS7 signal channel separately from an E1 line 41 for a call channel for transmitting and receiving voice information. Control two call channels. The ISDN PRI (ETSI / QSIG) signaling method, unlike the SS7 signaling method, constitutes a signal channel (30B channel + D channel) in the same E1 line 51, and transmits 1 signal through 1 signal channel (D channel). It controls 30 communication channels (B channels), which are E1 lines, and is applied to a dedicated line between the PSTN switch 10 and the PBX 20 or between the PBXs 20. The network interworking unit 30 includes an SS7 interface unit 31, an E1 interface unit 32, an ISDN PRI (Integrated Services Digital Network Primary Rate Interface) interface unit 33, and a controller 34. In addition, the network interworking server 30 may be made of a commercial server PC server or SUN server.

The SS7 interface unit 31 processes signals of the SS7 signaling transmitted / received through the E1 line for the SS7 signaling channel between the PSTN switch 10 and the network interworking unit 30, and supports the SS7 signaling.

The E1 interface unit 32 is connected to a call line between the PSTN switch 10 and the network interworking unit 30, more specifically, an E1 class call line and provides a call channel.

The ISDN PRI interface unit 33 processes ISDN PRI (ETSI / QSIG) signaling signals transmitted and received through the ISDN PRI line between the PBX 20 and the network interworking unit 30, and simultaneously provides a call channel.

The control unit 34 plays a role of a processor unit that performs a conversion function of the SS7 signaling system and the ISDN PRI (ETSI / QSIG) signaling system.

However, since the conventional network interworking server 30 must be provided as a separate device in order to interwork the network between the PSTN exchanger 10 and the PBX 20 using different signaling methods, the installation space is secured and maintained. There is such a problem.

In addition, according to the conventional network interworking server 30 increases the number of lines connected to the network interworking server 30, SS7 interface unit 31, E1 interface unit 32 installed in the network interworking server 30 And the ISDN PRI interface unit 33 should be increased, and when converting the SS7 signaling signal to the ISDN PRI signaling signal, a signal channel (D channel) in charge of signal processing is required for each E1 line. There is a problem that there is a limit in constructing a complex and large-capacity circuit.

In addition, the conventional network interworking server 30 configures a signal channel (D channel) in the E1 line 51 connected to the PBX 20, and does not constitute a separate backup channel, so that a failure occurs in the D channel. There is a problem that can not use the failed E1 line.

The present invention is to solve the above problems, the structure and installation is simple, is provided in the private exchange, the network using different signaling methods (for example, SS7 signaling and ISDN PRI (SL1) signaling) An object of the present invention is to provide a network interworking system and method for interworking.

Another object of the present invention is to provide a network interworking system and method for directly receiving an E1 line, which is an SS7 signaling channel of a PSTN exchanger, in a private exchange.

In addition, an object of the present invention is to provide a network interworking system and method for configuring a separate backup channel to automatically switch to a backup channel when the current signal channel failure occurs.

In order to achieve this object, a network interworking system for interworking a public switched telephone network (PSTN) and a private branch eXchange (PBX) of the present invention is a signal of the SS7 signaling supported by the PSTN. Signal conversion means for converting an ISDN PRI signaling signal supported by a PBX and converting the ISDN PRI signaling signal into the SS7 signaling signal; SS7 signal processing means for processing the signal of the SS7 signaling by supporting the SS7 signaling between the PSTN and the signal conversion means; ISDN PRI signal processing means for processing the ISDN PRI signaling by supporting the ISDN PRI signaling between the PBX and the signal conversion means; Operation and maintenance means for providing a function of signal management and maintenance between the signal conversion means, the SS7 signal processing means and the ISDN PRI signal processing means; A first signal channel connected to the PSTN and the network interworking system to transmit a signal of the SS7 signaling method; A second signal channel connected to the PBX and the network interworking system to transmit a signal of the ISDN PRI signaling scheme; And a call channel directly connected between the PSTN and the PBX to transmit voice between the PSTN and the PBX.

In addition, the network interworking system for interworking the public switched telephone network (PSTN) and private branch eXchange (PBX) of the present invention is SS7 signaling supported by the PSTN and ISDN PRI signal supported by the PBX Control means for interchanging the scheme; Ethernet interface means for a console interface for operation and maintenance (O & M) of the network interworking system; E1 matching means for providing a function of receiving the PSTN signal channel and the PBX signal channel; A first signal channel connected to the PSTN and the network interworking system to transmit a signal of the SS7 signaling method; A second signal channel connected to the PBX and the network interworking system to transmit a signal of the ISDN PRI signaling scheme; And a communication channel directly connected between the PSTN and the PBX to transmit voice between the PSTN and the PBX.

In addition, a network interworking method using a network interworking system for interworking a public switched telephone network (PSTN) and a private branch exchange (PBX) of the present invention is a) the signal transmitted from the PSTN and / or the PBX Receiving and analyzing the received signal; b) if it is determined that the received signal is an ISDN PRI signal, converting the received signal into an SS7 signal and transmitting the signal to the PSTN; c) if it is determined that the received signal is a signal of the SS7 signaling method and a signal supported by the SS7 signaling method and the ISDN PRI signaling method, the received signal is converted into the ISDN PRI signaling method to the PBX; Transmitting; And d) generating a response signal to the received signal and transmitting the response signal to the PSTN if it is determined that the received signal is a signal of the SS7 signaling method and a signal supported only by the SS7 signaling method. do.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 2 to 8.

2 is a block diagram showing a configuration of a communication system according to an embodiment of the present invention.

As shown, the communication system according to the present invention includes a PSTN switch 100, a private switch (PBX) 200, and a network interworking unit 300.

The PSTN switch 100 provides a voice information exchange service through a circuit switching method, and uses an SS7 signaling method.

PBX (200) is installed in a building or a certain area, the subscriber terminal, such as an analog phone or a digital phone, mutual internal calls, calls coming from the PSTN switch (100) and calls sent to the PSTN switch (100) It provides voice information exchange service with external subscriber by controlling and uses ISDN PRI (ETSI / QSIG, SL1) signaling method.

The network interworking unit 300 is accommodated in the PBX 200, and provides a function of converting an SS7 signaling signal and an ISDN PRI (SL1) signaling signal, and if a failure occurs in the currently operating D-channel 421. Switch to backup channel 422 automatically. The network linkage unit 300 will be described in more detail below with reference to FIGS. 3 to 8.

The two SS7 signal channels 411 and 412 connect the network interworking unit 300 and the PSTN switch 100, and both signal channels transmit signals of SS7 signaling.

Two ISDN PRI (SL1) signal channels 421 and 422, that is, two D channels, connect the network interworking unit 300 and the PBX 200. The D channel 421 transmits a signal of an ISDN PRI (SL1) signaling method to a primary D-channel. At this time, the D channel 421 processes 16 call E1 lines, that is, up to 480 call channels (16 E1 (30 channels)), and the D channel 422 transmits the current signal to the backup D channel. If a failure occurs in the channel 421, it is used to transmit a signal instead of the failed D channel 421.

The call channel 430 is directly connected between the PSTN exchanger 100 and the PBX 200 without passing through the network interworking unit 300 to transmit voice information between the PSTN exchanger 100 and the PBX 200.

Hereinafter, the network linkage unit 300 will be described in more detail with reference to FIGS. 3 to 8.

3 is a block diagram illustrating a hardware configuration of a network interworking unit according to an embodiment of the present invention.

As shown, the network interworking unit 300 according to the present invention includes a main control unit 310, an Ethernet interface unit 320, and an E1 matching unit 330.

The main control unit 310 controls the overall operation of the network interworking unit 300 and converts the SS7 signaling system and the ISDN PRI (SL1) signaling system. The flash memory unit 311, the RAM memory unit 312, and the controller 313. The flash memory 311 and the RAM memory 312 may be implemented as one memory.

The flash memory unit 311 stores an application program for converting a system operation program and an SS7 signaling system and an ISDN PRI (SL1) signaling system.

The RAM memory unit 312 stores an application program for operating the system.

The controller 313 controls the overall operation of the network interworking unit 300.

The Ethernet interface 320 is for a console interface (Osolation Interface) for the operation and maintenance (O & M) of the network interworking unit 300, the Ethernet controller 321 for controlling the Ethernet port and the physical interface of the Ethernet port A transformer 322 is provided for providing the port.

The E1 matching unit 330 interworks with the E1 line of the PSTN 100, more specifically, accepts the signal channels 411 and 412 for the SS7 and the ISDN PRI (SL1) signal channels 421 and 422 for the PBX 200. For the sake of brevity, a line interface 331 and an E1 framer 332 are included.

The line interface 331 provides the physical E1 line interface of the signal channels 411 and 412 for SS7 and the ISDN PRI (SL1) signal channels 421 and 422 for the PBX 200 provided at the PSTN exchange 100. .

The E1 framer 332 provides error monitoring and timing matching for the physical E1 line of the signal channels 411 and 412 for SS7 and the ISDN PRI (SL1) signal channels 421 and 422 for the PBX 200.

4 is a block diagram showing a software configuration of a network interworking unit according to an embodiment of the present invention.

As shown, the network interworking unit 300 according to the present invention includes a signal converter 510, an SS7 signal processor 520, an ISDN PRI (SL1) signal processor 530, and an operation and maintenance center (OMC) 540. ).

The signal converter 510 converts an SS7 signal signal output from the SS7 signal processor 520 into an ISDN PRI (SL1) signal signal and transmits the signal to the ISDN PRI (SL1) signal processor 530, and sends the ISDN PRI signal. (SL1) The signal of the ISDN PRI (SL1) signal type output from the signal processing unit 530 is converted into an SS7 signal type signal and transmitted to the SS7 signal processing unit 520. In addition, the signal converter 510 does not support the ISDN PRI (SL1) signal method and processes the signal itself supported only by the SS7 signal method. For example, since a call management message supported only by the SS7 signaling is not supported by the ISDN PRI signaling, the signal conversion unit 510 may own a call management message transmitted from the SS7 signal processing unit 520. To be processed.

The SS7 signal processor 520 processes the signals of the SS7 signaling by supporting the SS7 signaling between the PSTN switch 100 and the signal converter 510, and includes the MTP (Message Transfer Part) 521 and the ISUP (ISDN User). Part) 522 and ISUPCA 523.

The MTP 521 transfers the message of the upper SS7 signaling, and consists of MTP1, MTP2, and MTP3. MTP1 is a physical layer that carries a signal message electrically in a transmission path. The MTP1 defines physical conditions, electrical conditions, and mechanical characteristics (signal transmission speed, transmission scheme, and transmission code) of a signal data link. MTP2 is a data link layer that provides reliable transmission to the PSTN exchange 100 or PBX 200 via a signal data link, and is a signal unit to the PSTN exchange 100 or PBX 200 via a signal line. Perform an error check or resend function to correctly transmit). Here, the signal unit means a packet used to transmit a signal of the SS7 signaling. MTP3 is a network layer that combines signaling channels and delivers signaling messages to the exchanges of destinations. In case of failure of a signaling channel, MTP3 performs a network function that bypasses other signaling channels and distributes signals to the ISUP 522. do.

The ISUP 522 defines a message for setting up the SS7 signaling line of the PSTN exchange 100 that carries voice and data calls, and other messages related to call processing and status management. The message defined in ISUP 522 is as follows.

IAM (Initial Address Message): IAM is used to request the network connection to the destination exchange by the call establishment request from the originator. The IAM contains basic information necessary for circuit connection, that is, a called number for routing, required call channel information, and the like.

ACM (Address Complete Message): ACM is used to indicate that the information required to set up a call to the called terminal has been received. It is transmitted from the called terminal station to the calling terminal station. When the circuit connection is incomplete and the user wants to transmit channel information such as return from the switch to the sender, the relevant information is included and transmitted.

ANM (Answer Message): ANM is used to notify the calling party that the called party has answered the call and is sent from the called station to the calling station. In the network, the connection of the call line is completed at the same time as the transmission of the ANM.

REL (Release Message): REL is used to request the restoration of a call line when the call becomes incomplete or when communication is completed.

-RLC (Release Complete Message): RLC is used to recover the line when receiving the REL and to notify the originating station that sent the REL that it is in a state that can be used for another call.

The ISUPCA 530 processes call control and call management messages.

The ISDN PRI (SL1) signal processor 530 supports ISDN PRI (SL1) signaling between the PBX 200 and the signal converter 510, and includes a Link Access Protocol-D channel (LAPD) 531 and a PRI ( Primary Rate Interface) 532.

The LAPD 531 configures a data link between the PBX 200 and the signal converter 410, and performs flow control such as frame transmission and error check through the data link, and performs the following functions.

 Connection Establishment (Data Link Connection): A logical connection is established using SABME (Set Asynchronous Balanced Mode Extended) and UA (Unnumbered Acknowledgement).

-Data Transfer: Sends and receives messages in the form of frames, and frames are discarded when FCS (Frame Check Sequence) occurs.

Connection Termination: Terminate the connection by using DISC (Disconnect) and UA (Unnumbered Acknowledgement).

The PRI 532 processes a Call Control Message in a signaling manner executed above the LAPD 531. The PRI 532 is configured to initialize a Calling Terminal, call progress to send or not to process the received setup, alert notification to send Ring Backtone, and call Call setup is performed through a procedure such as Connected.

The OMC 540 is to provide a function of data management and maintenance between the signal converter 510, the SS7 signal processor 520, and the ISDN PRI (SL1) signal processor 530, and includes a command line interface (CLI) ( 541 and OMC agent 542.

CLI 541 provides settings for data management (eg, addition, deletion, change, etc.) and debugging of signal converter 510, SS7 signal processor 520, and ISDN PRI (SL1) signal processor 530. do.

The OMC agent 542 maintains a connection between the signal converter 510, the SS7 signal processor 520, and the ISDN PRI (SL1) signal processor 530, and provides an operation and maintenance function.

Hereinafter, a procedure of processing a call control message in the network interworking unit 300 will be described in detail with reference to FIG. 5.

5 is a flowchart showing a procedure of processing a call control message according to an embodiment of the present invention.

As shown, when a caller executes a call request using a terminal device (not shown) connected to the PBX 200, the PBX 200 generates a setup message and calls the generated setup message. A trunk value and a channel field are included as key values for distinguishing the data and transmitted to the ISDN PRI (SL1) signal processor 530 of the network matching unit 300 (S110).

Upon receiving the setup message, the ISDN PRI (SL1) signal processor 530 generates an ISDN_SETUP message and includes the trunk field, channel field, and Call_ID field in the generated ISDN_SETUP message and transmits it to the signal converter 510 (S120). .

The signal converter 510 receiving the ISDN_SETUP message generates an ISDN_PROCEED message, includes the trunk field, the channel field, and the Call_ID field in the ISDN_PROCEED, and transmits it to the ISDN PRI (SL1) signal processor 530 (S130). The ISDN PRI (SL1) signal processor 530 generates a PROCEED message and includes the trunk field and the channel field in the PROCEED message and transmits the message to the PBX 200 (S140).

Meanwhile, upon receiving the ISDN_SETUP message, the signal conversion unit 510 generates an SS7_SETUP message corresponding to the ISDN_SETUP message, and as a key value for distinguishing a call, SID (System ID), BID (Base ID), and TID (Transaction ID). In addition, the CID (Communication ID) is included in the SS7_SETUP message and transmitted to the ISUPCA 523 of the SS7 signal processor 520 (S150).

The ISUPCA 523 includes an Origin Point Code (OPC), Destination Point Code (DPC), and Circuit Identification Code (CIC) in the received SS7_SETUP message as a key value for distinguishing a call, and transmits it to the ISUP 522 (S160). .

The ISUP 522 generates an IAM message for call establishment, includes the OPC, DPC, and CIC in the IAM message and transmits it to the PSTN exchange 100 (S170), and the PSTN exchange 100 transmits the received IAM message to the received IAM message. An ACM message is generated as a response message, and the generated ACM message is transmitted to the ISUP 522 (S180).

The ISUP 522 generates the SS7_ALERT message and transmits the generated SS7_ALERT message to the ISUPCA 523 and the signal converter 510 (S190 and S200).

The signal converter 510 generates an ISDN_ALERTING message corresponding to the received SS7_ALRET message, and transmits the generated ISDN_ALERTING message to the ISDN PRI (SL1) signal processor 530 (S210).

The ISDN PRI (SL1) signal processor 530 generates an ALERTING message and transmits the generated ALERTING message to the PBX 200 (S220).

Meanwhile, the PSTN exchange 100 generates an ANM message indicating that the receiver has responded, and transmits the generated ANM message to the ISUP 522 (S230).

The ISUP 522 generates the SS7_ANSWER message and transmits the generated SS7_ANSWER message to the ISUPCA 523 and the signal converter 510 (S240 and S250).

The signal converter 510 generates an ISDN_CONNECT message corresponding to the received SS7_ANSWER message, transmits the generated ISDN_CONNECT message to the ISDN PRI (SL1) signal processor 530 (S260), and the ISDN PRI (SL1) signal processor (S1). 530 transmits a CONNECT message to the PBX 200 (S270), thereby completing call setup between the PBX 200 and the PSTN exchange 100.

When the caller ends the call, the PBX 200 generates a DISCONNECT message requesting the release of the call line and transmits the generated DISCONNECT message to the ISDN PRI (SL1) signal processor 530 (S280).

The ISDN PRI (SL1) signal processor 530 generates an ISDN_DISCONNECT message and transmits the generated ISDN_DISCONNECT message to the signal converter 510 (S290).

The signal converter 510 generates an SS7_RELEASE message corresponding to the received ISDN_DISCONNECT message, and transmits the generated SS7_RELEASE message to the ISUPCA 523 and the ISUP 522 (S300 and S310).

The ISUP 522 generates a REL message requesting the release of the call line, and transmits the generated REL message to the PSTN exchange 100 (S320), and the PSTN exchange 100 is a response message to the received REL message. The RLC message is generated and the generated RLC message is transmitted to the ISUP 522 (S320).

The ISUP 522 generates the SS7_RELCOMP message and transmits the generated SS7_RELCOMP message to the ISUPCA 523 and the signal converter 510 (S340 and S350).

The signal converter 510 generates an ISDN_RELCOMP message corresponding to the received SS7_RELCOMP message, and transmits the generated ISDN_RELCOMP message to the ISDN PRI (SL1) signal processor 530 (S360).

The ISDN PRI (SL1) signal processor 530 generates a RELEASE message requesting call release, transmits the generated RELEASE message to the PBX 200 (S370), and the PBX 200 generates a RELCOMP message and generates the generated RELEASE message. By transmitting the received RELCOMP message to the ISDN PRI (SL1) signal processor 530 (S380), call release between the PBX 200 and the PSTN exchange 100 is completed.

Hereinafter, a procedure of processing a message for requesting block and unblock for each channel in the network interworking unit 300 will be described in detail with reference to FIG. 6. Here, the block request message is a message requesting not to use the corresponding communication channel, and the unblock request message is a message requesting to release the convex to use the communication channel.

6 is a flowchart illustrating a procedure of processing a message for requesting block and unblock for each channel according to an embodiment of the present invention.

As shown, when the PSTN exchange 100 transmits a BLO message requesting a block for each channel to the ISUP 522 (S410), the ISUP 522 generates an SS7_MAINT_BLOCK message, and generates the generated SS7_MAINT_BLOCK message to ISUPCA. 523 and the signal converter 510 (S420 and S430).

The signal conversion unit 510 checks the received SS7_MAINT_BLOCK message to confirm that the message is not supported by the ISDN PRI (SL1) signaling method, generates an SS7_MAINT_BLOCK_ACK message as a response message to the received SS7_MAINT_BLOCK message, and generates the generated SS7_MAINT_BLOCK_ACK message. The data is transmitted to the ISUPCA 523 and the ISUP 522 (S440 and S450).

The ISUP 522 generates a BLA message as a response message to the BLO message, and transmits the generated BLA message to the PSTN exchange 100 (S460), thereby blocking the corresponding channel.

On the other hand, if the PSTN exchange 100 transmits a UBL message requesting an unblock for the channel to the ISUP 522 (S470), the ISUP 522 generates an SS7_MAINT_UNBLOCK message and sends the generated SS7_MAINT_UNBLOCK message to the ISUPCA 523. And it transmits to the signal converter 510 (S480 and S490).

The signal converter 510 inquires the received SS7_MAINT_UNBLOCK message to confirm that the message is not supported by the ISDN PRI (SL1) signaling method, generates an SS7_MAINT_UNBLOCK_ACK message as a response message to the received SS7_MAINT_UNBLOCK message, and generates the generated SS7_MAINT_UNBLOCK_ACK message. The data is transmitted to the ISUPCA 523 and the ISUP 522 (S500 and S510).

The ISUP 522 generates a UBA message as a response message to the UBL message, and transmits the generated UBA message to the PSTN exchange 100 (S520), thereby unblocking the corresponding channel.

Hereinafter, a procedure of processing a message for requesting a block and unblock for a channel in a trunk group unit in the network interworking unit 300 will be described in detail with reference to FIG. 7.

7 is a flowchart illustrating a procedure of processing a message for requesting block and unblock for a channel in a trunk group according to an embodiment of the present invention.

As shown, when the operator requests a block for a channel of a trunk group through the OMC 540, the signal converter 510 generates and generates an SS7_MAINT_GRPBLOCK message requesting a block for a channel of a trunk group. The SS7_MAINT_GRPBLOCK message is transmitted to the ISUPCA 523 and the ISUP 522 (S610 and S620).

The ISUP 522 generates a CGB message, transmits the generated CGB message to the PSTN exchange 100 (S630), and the PSTN exchange 100 generates a CGBA message as a response message to the received CGB message. The generated CGBA message is transmitted to the ISUP 522 (S640).

The ISUP 522 generates the SS7_MAINT_GRPBLOCK_ACK message, and transmits the generated SS7_MAINT_GRPBLOCK_ACK message to the ISUPCA 523 and the signal converter 510 (S650 and S660), thereby blocking the channel of the corresponding trunk group.

On the other hand, when the operator requests an unblock for the channel in the trunk group unit through the OMC 540, the signal converter 510 generates an SS7_MAINT_GRPUNBLOCK message requesting the unblock for the channel in the trunk group unit, and generated The SS7_MAINT_GRPUNBLOCK message is transmitted to the ISUPCA 523 and the ISUP 522 (S670 and S680).

The ISUP 522 generates a CGU message, transmits the generated CGU message to the PSTN exchange 100 (S690), and the PSTN exchange 100 generates a CGUA message as a response message to the received CGU message, and generates the CGU message. The CGUA message is transmitted to the ISUP 522 (S700).

The ISUP 522 generates the SS7_MAINT_GRPUNBLOCK_ACK message and transmits the generated SS7_MAINT_GRPUNBLOCK_ACK message to the ISUPCA 523 and the signal converter 510 (S710 and S720), thereby unblocking the channel in the corresponding trunk group unit.

Hereinafter, a procedure of processing a message for requesting a reset for each channel and a channel of a trunk group unit in the network interworking unit 300 will be described in detail with reference to FIG. 8. Here, the reset request message is a message for initializing the channel and requesting normal use when the call channel is not normal.

8 is a flowchart illustrating a procedure of processing a message for requesting a reset for each channel and a channel of a trunk group according to an embodiment of the present invention.

As shown, when the PSTN exchange 100 generates an RSC message requesting a reset for the channel, and transmits the generated RSC message to the ISUP 522 (S810), the ISUP 522 generates an SS7_RESET message. In operation S820 and S830, the generated SS7_RESET message is transmitted to the ISUPCA 523 and the signal converter 510.

The signal converter 510 checks the received SS7_RESET message to confirm that the message is not supported by the ISDN PRI (SL1) signaling method, generates an SS7_RESET_ACK message as a response message to the received SS7_RESET message, and generates the generated SS7_RESET_ACK message. The data is transmitted to the ISUPCA 523 and the ISUP 522 (S840 and S850).

The ISUP 522 generates an RLC message as a response message to the RSC message and transmits the generated RLC message to the PSTN exchange 100 (S860), thereby resetting the corresponding channel.

On the other hand, if the PSTN exchange 100 generates a GRS message requesting the reset of the channel in the trunk group unit and transmits the generated GRS message to the ISUP 522 (S870), the ISUP 522 generates an SS7_GRPRESET message. Then, the generated SS7_GRPRESET message is transmitted to the ISUPCA 523 and the signal converter 510 (S880 and S890).

The signal converter 510 inquires the received SS7_GRPRESET message to confirm that the message is not supported by the ISDN PRI (SL1) signaling method, generates an SS7_GRPRESET_ACK message as a response message to the received SS7_GRPRESET message, and generates the generated SS7_GRPRESET_ACK message. The data is transmitted to the ISUPCA 523 and the ISUP 522 (S900 and S910).

The ISUP 522 generates a GRA message as a response message to the GRS message and transmits the generated GRA message to the PSTN exchange 100 (S920), thereby resetting the channel of the corresponding trunk group unit.

While the present invention has been described and illustrated by way of preferred embodiments, those skilled in the art will recognize that various modifications and changes can be made without departing from the spirit and scope of the appended claims.

As described above, according to the present invention, up to 480 (16 E1 x 30 channels) are implemented by implementing the nB + D method by using one D channel resource on 16 E1 lines for ISDN PRI (SL1) signal processing. Can handle call channel

Further, according to the present invention, not only the configuration of the network interlocking part can be simplified, but also the network interlocking part can be easily maintained and repaired by accommodating the network interlocking part in the private exchange.

In addition, according to the present invention, a separate backup channel may be configured to automatically switch to the backup channel when a failure occurs in the currently operating signal channel.

Claims (13)

As a network interworking system for interworking a public switched telephone network (PSTN) and a private branch eXchange (PBX), Signal conversion means for converting an SS7 signaling signal supported by the PSTN into an ISDN PRI signaling signal supported by the PBX, and converting the ISDN PRI signaling signal into the SS7 signaling signal; SS7 signal processing means for processing the signal of the SS7 signaling by supporting the SS7 signaling between the PSTN and the signal conversion means; ISDN PRI signal processing means for processing the ISDN PRI signaling by supporting the ISDN PRI signaling between the PBX and the signal conversion means; Operation and maintenance means for providing a function of signal management and maintenance between the signal conversion means, the SS7 signal processing means and the ISDN PRI signal processing means; A first signal channel connected to the PSTN and the network interworking system to transmit a signal of the SS7 signaling method; A second signal channel connected to the PBX and the network interworking system to transmit a signal of the ISDN PRI signaling scheme; And A communication channel directly connected between the PSTN and the PBX to transmit voice between the PSTN and the PBX Network interlocking system comprising a. The network interworking system of claim 1, wherein the network interworking system is mounted to the PBX. The network interworking system of claim 1, wherein the second signal channel includes a backup channel for transmitting an ISDN PRI signaling signal instead of the second signal channel when a failure occurs in the second signal channel. The method of claim 1, wherein the SS7 signal processing means Means for electrically carrying the SS7 signaling signal and providing reliable transmission between the PSTN and the network interworking system; Means for processing a call related message and a status management message between the PSTN and the network interworking system; And Means for processing a call control and call management message between the PSTN and the network interworking system; Network interlocking system comprising a. The method of claim 1, wherein the ISDN PRI signal processing means Means for establishing a data link between the PBX and the network interworking system and controlling the flow of frames over the data link; And Means for processing a call related message between the PBX and the network interworking system Network interlocking system comprising a. The method of claim 1, wherein the operation and maintenance means Means for managing signals transmitted between said signal conversion means, said SS7 signal processing means and said ISDN PRI signal processing means; And Means for maintaining a connection between the signal conversion means, the SS7 signal processing means and the ISDN PRI signal processing means, and providing an operation and maintenance function; Network interlocking system comprising a. As a network interworking system for interworking a public switched telephone network (PSTN) and a private branch eXchange (PBX), Control means for converting between SS7 signaling supported by the PSTN and ISDN PRI signaling supported by the PBX; Ethernet interface means for a console interface for operation and maintenance (O & M) of the network interworking system; E1 matching means for providing a function of receiving the PSTN signal channel and the PBX signal channel; A first signal channel connected to the PSTN and the network interworking system to transmit a signal of the SS7 signaling method; A second signal channel connected to the PBX and the network interworking system to transmit a signal of the ISDN PRI signaling scheme; And A communication channel directly connected between the PSTN and the PBX to transmit voice between the PSTN and the PBX Network interlocking system comprising a. The network interworking system of claim 7, wherein the network interworking system is mounted to the PBX. 8. The network interworking system of claim 7, wherein the second signal channel includes a backup channel for transmitting an ISDN PRI signaling signal instead of the second signal channel when the second signal channel fails. The method of claim 6, wherein the control means Means for storing an operating program for operating said network interworking system and an application program for converting between SS7 signaling and said ISDN PRI signaling; And Means for controlling the operation of the network interworking system Network interlocking system comprising a. The method of claim 7, wherein the Ethernet interface means An Ethernet controller for controlling the Ethernet port; And Transformer to provide physical interface port of the Ethernet port Network interworking system comprising a. The method of claim 7, wherein the E1 matching means A line interface unit for providing a physical E1 line interface between the SS7 signal channel and the ISDN PRI signal channel provided from the PSTN; And E1 framer to provide error monitoring and timing matching for the physical E1 circuit Network interworking system comprising a. A network interworking method using a network interworking system that links a public switched telephone network (PSTN) and a private branch eXchange (PBX), a) receiving a signal transmitted from the PSTN and / or the PBX and analyzing the received signal; b) if it is determined that the received signal is an ISDN PRI signal, converting the received signal into an SS7 signal and transmitting the signal to the PSTN; c) if it is determined that the received signal is a signal of the SS7 signaling method and a signal supported by the SS7 signaling method and the ISDN PRI signaling method, the received signal is converted into the ISDN PRI signaling method to the PBX; Transmitting; And d) generating a response signal to the received signal and transmitting the response signal to the PSTN if it is determined that the received signal is a signal of the SS7 signaling method and a signal supported only by the SS7 signaling method; Network interworking method comprising a.

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