KR20010065933A - Apparatus and method for processing trunk call by using No.7 in exchange - Google Patents

Abstract

PURPOSE: An apparatus and a method for processing transit calls using a No.7 signaling method in a digital exchange is provided to substitute a No.7 common channel signaling method for a channel associated signaling method. CONSTITUTION: An apparatus for processing transit calls using a No.7 signaling method in a digital exchange consists of a TCS-T TCP(10), a TCS-7 TCP(20), and a TCS-7 SSHP(Signaling Subsystem Handling Processor)(30). The TCS-T TCP(10) is provided with a TCAP(Transaction Capabilities Application Part)(11) and an ISUP(ISDN User Part)(12). The TCAP(11) transmits and receives information with a service controller and a database using an SCCP(Signaling Connection Control Part)(31) in the TCS-7 SSHP(30). The ISUP(12) provides ISDN services to subscribers. The TCS-7 TCP(20), connected with the TCS-T TCP(10), executes internal network management, SCCP management and MTP(Message Transfer Part) management. The TCS-7 SSHP(30), connected with the TCS-T TCP(10) and the TCS-7 TCP(20), contains the SCCP(31) executing a routing function to make a line non-associated signal transmitted between exchanges and controlling the flow and order of messages.

Description

Apparatus and method for processing trunk call by using No. 7 in exchange}

The present invention relates to a relay call processing apparatus using the No. 7 of a digital switch and a method thereof, and in particular, the individual line signaling method used as the existing inter-station signaling method for supporting multimedia services as a common line signaling method using No. 7. The present invention relates to a relay call processing apparatus using No. 7 of a digital switch and a method thereof suitable for replacement.

In general, high-speed multimedia digital communication systems have started to require changes in existing analog telephone networks. As a first step, the necessity of digital switching for digital subscribers has been highlighted. To this end, we began to develop digital switchboards, and through the change of PSTN (Public Switched Telephone Network) by changing the individual line signaling method used in the existing analog telephone network as inter-station signaling method to common line signaling method using No.7 It will provide multimedia services.

R2, which has been used as an inter-station signal method in the conventional analog exchange, is a method of transmitting and receiving signals in response to individual voice communication lines as an individual line signal method. Therefore, a signal function is required for each communication line.

The conventional individual line signaling method is largely divided into a selection signal and a monitoring signal, and the selection signal is classified into a dial pulse signal method (Dial Pulse, DP) and a multi-frequency signal method (Multi Frequency, MF). In the separate line signal system, there are a plurality of signal systems based on a combination of the monitoring signal and the selection signal. The operation of the signal system using the frequency signal as the monitoring signal band and the MF signal as the selection signal will be described.

First, the 3,850Hz signal flows in both directions.

The stopping exchange is started by stopping the 3,850 Hz signal from the changing exchange.

This stops the 3850 Hz signal from the landing exchange to inform the issuing exchange that it is ready to receive a selection.

It sends a KP (Key Pulsing) signal prior to sending the selected number from the issuing exchange.

The 3,850 Hz signal is sent again from the landing exchange to inform the issuing exchange of the completion of the selection signal receiving register.

The issuing exchange sends numeric information as an MF signal and finally sends an ST code.

When the called terminal responds, it stops the 3,850 Hz signal from the called exchange to notify the called exchange of the called terminal's response. During the call, the 3,850 Hz signal is stopped in both directions.

When the receiver makes a handset, the 3,850 Hz signal is sent from the exchange to the issuing exchange and is used as a termination signal.

In addition, when the calling party hangs the handset, a 3,850 Hz signal is sent from the exchange to the landing exchange as a disconnection signal.

A 3,850 Hz signal is temporarily stopped from the exchanger to make a completion signal.

The above is a schematic description of the individual line signal system which is a conventional inter-station signal system.

However, this conventional technology has a problem of stability of a telephone call, and has a disadvantage in that only an analog telephone call is serviced and a digital telephone call cannot be serviced.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is a common line signaling method using a No. 7 individual line signaling method used as an existing inter-station signaling method for supporting multimedia services. The present invention provides a relay call processing apparatus using the No. 7 of a digital switch and a method thereof.

In order to achieve the above object, a relay call processing apparatus using No. 7 of a digital switchboard according to an embodiment of the present invention,

A TCP of a TCS-T having a TACP for transmitting and receiving information between a service control station and a database using an SCCP in an SSHP, and an ISUP providing an ISDN service to a subscriber; TCP of TSC-7 connected to TCP of TSC-T and managing internal network management, SCCP management, and MTP; The TSC-7 is connected to the TCP of the TSC-T and the TCP of the TCS-7, and performs a routing function to transmit a line non-corresponding signal in an arbitrary exchange period, and has a SCCP that controls a message flow rate and sequence. It consists of SSHP and its technical configuration features.

In order to achieve the above object, a relay call processing method using No. 7 of a digital switchboard according to an embodiment of the present invention,

The calling subscriber establishes a call by calling the called subscriber through the digital switch to perform information transmission; If the calling subscriber requests the disconnection after performing the information transmission, the calling subscriber immediately disconnects, and the called subscriber gives a predetermined timing and performs the step of disconnecting after the completion of the calling subscriber. .

1 is a block diagram of a relay call processing apparatus using No. 7 of a digital switchboard according to an embodiment of the present invention;

2 is a configuration diagram of an ISUP signal format used in FIG.

3 is a configuration diagram of a trunk rack in which FIG. 1 is mounted;

4 is a DCI block diagram of FIG. 3;

5 is a flow diagram of message relay between digital subscribers in a relay call processing method using No. 7 of a digital exchange according to an embodiment of the present invention;

6 is a flowchart showing digital analog linkage in a relay call processing method using No. 7 of a digital switchboard according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: TCS-T TCP 11: TCAP

12: ISUP 20: TSC-7 TCP

30: TCS-7 SSHP 31: SCCP

Hereinafter, an embodiment according to the technical concept of the relay call processing apparatus and the method using No. 7 of the present invention digital exchange will be described.

First, the present invention uses a specific channel (D channel) as a signal channel, as well as a data call as well as a telephone call via a narrowband integrated services digital network (N-ISDN), which can support three communication services at the same time. Overcoming the service limitations of the existing telephone call only with the multimedia service that can be serviced, and solving the call stability problem through the duplication of the signal channel by using specific channels on each physical link as the signal channel.

1 is a block diagram of a relay call processing apparatus using No. 7 of a digital switchboard according to an embodiment of the present invention.

As shown therein, a TACP (Signal Connection Control Part) (SCCP) in a Signaling Subsystem Handling Processor (SSCP) 30 performs a TACP (transmission / reception) between a service control station and a database. A TCP (10) of the TCS-T having a Transaction Capabilities Application Part (11) and an ISDN User Part (ISP) 12 for providing ISDN services to subscribers; A TCP 20 of the TSC-7 connected to the TCP 10 of the TSC-T to manage internal network management, SCCP management, and MTP (Message Transfer Part); SCCP is connected to the TCP 10 of the TSC-T and the TCP 20 of the TCS-7, performs a routing function so as to transmit a line non-compliant signal in an arbitrary exchange period, and controls the flow rate and sequence of messages. 31) and the SSHP 30 of the TSC-7.

5 is a flow diagram of message relay between digital subscribers in a relay call processing method using No. 7 of a digital exchange according to an embodiment of the present invention.

As shown therein, the calling subscriber sets up a call by calling the called subscriber through the digital exchange (ST10); If the calling subscriber requests the disconnection after performing the information transmission, the calling subscriber immediately disconnects, and the called subscriber gives a predetermined timing and then disconnects after completing the disconnection of the calling subscriber (ST20) (ST30).

6 is a flowchart showing digital analog linkage in a relay call processing method using No. 7 of a digital switchboard according to an embodiment of the present invention.

As shown, when the calling subscriber makes a setup request, the digital exchange sends an IAM (Initial Address Message) to the analog exchange so that the called party rings. (ST40); If the analog exchange transmits an audible sound of InChannel from the analog exchange to the digital exchange, the digital exchange makes a ringing tone to the calling subscriber (ST50); When the called subscriber responds, the response is sent to the calling subscriber through the analog exchange and the digital exchange to perform communication (ST60) (ST70).

Operation of the relay call processing apparatus and method thereof using No. 7 of the digital switch according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the No.7 signaling method is an ISDN protocol reference model (ISDN-PRM) proposed by the Integrated Services Digital Network (ISDN) structure of Recommendation I.320 of the International Telegraph and Telephone Consultative Committee (CCITT). Among three orthogonal planes (User Plane, Control Plane, and Management Plane) of (Protocol Reference Model), it is the control plane, and from the end-user's point of view, network layer service (Layer 1 ~ 3) It serves to provide. No.7 signaling is divided into two functions, namely, network service part (NSP) and user part (User part, UP). NSP transmits a signal message reliably, and UP is provided by NSP. It refers to a functional entity that utilizes its transmission capacity. No.7 signaling is developed for use in digital communication networks and ISDN, is hierarchically modularized, common line signaling, and can be used in intelligent networks such as communication networks that contribute to special services. Compared to the existing signaling system, it is easier to provide reliability and other new services (CUG, closed subscriber group, credit call, wide area incoming service, etc.) with rich signal capacity, high speed transmission, error detection and correction.

Therefore, No.7 signaling method is one of the internationally standardized common line signaling method (a method of using one common signal path by distinguishing a path through which data is transmitted and a path of a signal used for transmitting the data). In this way, information can be transmitted without duplication in the order of the messages, and each of them is distinguished from each other by a unique recognition symbol in an internationalized format called a signal point.

As such, in order to interoperate with other systems using the No.7 protocol, the No.7 protocol hierarchy must be provided.

In the No.7 protocol hierarchy, Signaling Data Link (SDL) is used for the actual transmission of signaling messages and means a physical path composed of digital or analog transmission media. It is a bidirectional transmission channel consisting of two data channels running in opposite directions at the same speed.

A signaling terminal (ST) is a device that performs a reliable transmission of a message using a signal data link, and performs all the functions defined in level 2. This is an actual hardware connection point connected to other signal points as a signal terminal, and one ST is used for one signal link. Signaling link (SL) is a link connected between signal points for the purpose of transmitting a signal message, and is composed of a signal data link and a signal terminal.

Meanwhile, the processing procedure of the ISUP will be described with reference to FIG. 3, which is a mounting diagram of the trunk rack of the digital switchboard. The main processor (MP) for the ISUP call processing is mounted on the bottom shelf of the rack to handle the overall relay call processing. In addition, E1 links, which are physical connections to external exchanges, can connect up to 64 E1 to the fourth shelf below, and their directors are Digital CEPT Interface Processors (DIP), the Peripheral Processor (PP), to the second shelf below. Redundancy is managed through the CEPT interface processor.

4 is a DCI block diagram of FIG.

Figure 4 shows the relationship between MP and PP and other state related processors.

On the other hand, the ISUP 11 in the TCP 10 of the TSC-T performs information transmission and reception with the service control station and the database using the SCCP 31, and the ISUP 12 provides the ISDN service to the subscriber. The TCP 20 of the TCS-7 manages the internal network management, the SCCP management, and the MTP. The SCCP 31 in the SSHP 30 performs a routing function to transmit a line non-corresponding signal in an arbitrary exchange period. Control message flow rate and order.

If the ISUP 12 turns out to be a relay call as a result of number translation, the D channel call control information is processed by the originating exchange to the ISUP, and is transmitted to the destination exchange by the common line signaling network, and the destination exchange again uses the D channel to call the called party. Prior to transmitting the control information, the ISUP message format will be described with reference to FIG.

That is, the format of the ISUP signal is a routing label, a line signal, a signal type, a mandatory fixed length parameter that is the content of a parameter, a mandatory fixed length parameter, a pointer that is a location of each mandatory variable length parameter, a pointer that is a location of each mandatory variable length parameter, A pointer that is the head of the option parameter group, a mandatory variable length parameter having the length and content of the parameter, a mandatory variable length parameter, an option parameter having the type and length of the parameter and the content of the parameter, an option parameter, an option parameter termination Are separated by a mark. Here, the optional parameter may be unnecessary depending on the service condition.

Meanwhile, the features of the ISUP seen in the ISUP connection sequence are as follows.

1. Employing symmetrical cutting sequence: TUP (Telephone User Part) cuts the call immediately, and the incoming call has a certain timing and waits for the call. In ISUP, cutting is performed as soon as the cutting request is received from the user, regardless of foot / sitting.

2. Notification of call progress indication: Since the TUP is a control for telephone calls, the sound transmission during the call is transmitted from the destination exchange to the calling subscriber as an audible sound of In Channel, and the out channel using the common line signal ( A channel separate from the communication channel) is not transmitted. Since ISUP is intended for phone calls, faxes, and data calls, the out channel signal is used to send out the status of the call as an elapsed indication signal.In case of handling the phone call with ISUP, the in-channel audible sound (ringback tone, etc.) is also out channel signal TUP transmits a busy tone from the destination exchange to the in-channel when the call is in progress.However, ISUP sends a busy tone from the destination exchange to the calling exchange with the reason indication parameter included in the cutoff signal. Notify the cause of call incompleteness.

3. Return of address complete signal: The address complete signal (Address Complete Message, ACM) is a signal for notifying the originating exchange that all information necessary for selecting a called party has been received.

As such, the present invention is to replace the individual line signaling method used as the signaling method between the existing stations to the common line signaling method using No. 7 to support the multimedia service.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the relay call processing apparatus using the No. 7 of the digital exchange according to the present invention and its method are the basic according to the development of the fragrance network concept when the analog exchange of the existing PSTN is replaced by the digital exchange for multimedia services. There is an effect that can be usefully used as a relay call signaling method.

Claims (3)

A TCP of a TCS-T having a TACP for transmitting and receiving information between a service control station and a database using an SCCP in an SSHP, and an ISUP providing an ISDN service to a subscriber; TCP of TSC-7 connected to TCP of TSC-T and managing internal network management, SCCP management, and MTP; The TSC-7 is connected to the TCP of the TSC-T and the TCP of the TCS-7, and performs a routing function to transmit a line non-corresponding signal in an arbitrary exchange period, and has a SCCP that controls a message flow rate and sequence. Relay call processing apparatus using the No.7 of the digital switchboard, characterized in that consisting of SSHP. The calling subscriber establishes a call by calling the called subscriber through the digital switch to perform information transmission; When the calling subscriber requests the disconnection after performing the information transmission, the calling subscriber immediately disconnects, and the called subscriber gives a predetermined timing and then disconnects after completing the disconnection of the calling subscriber. Relay call processing method using No.7. When the calling subscriber makes a setup request, the digital exchange sends an IAM to an analog exchange to ring the called subscriber, and indicates the progress to the calling subscriber; When the analog exchange transmits an audible sound of an in channel from the analog exchange to the digital exchange, the digital exchange ringing a calling tone to the calling subscriber; When the called subscriber responds, the response content transmits the response content to the calling subscriber through the analog exchange and the digital exchange so that communication is performed. How to handle relay call.