KR100238435B1 - Service control method for analogue subscriber in atm interworking subsystem - Google Patents

Abstract

The present invention relates to a method for controlling outgoing and incoming services to voice subscribers housed in an ATM interworking subsystem. Through the present invention, a voice call using a plain old telephone service (POTS) line, which is being used, is used as it is in an ATM switching system without any additional equipment, and is connected to an ATM exchanger. By establishing a road, a call is possible, and in this process, by providing various tones, announcements, and rings, it is possible to provide the same level of voice service as a voice subscriber accommodated in an existing PSTN exchange. .

Description

Service Control Method of Voice Subscriber Accepted in AMT Interworking Subsystem

The present invention relates to a method for controlling an outgoing and incoming service to a voice subscriber accommodated in an Asynchronous Transfer Mode (ATM) interworking subsystem, and in particular, a single call by controlling a STM (Synchronous Transfer Mode) switch and an ATM switch to which a voice subscriber is connected. The present invention relates to a control method for constructing a path and providing subscribers with various types of service equipment mounted in an ATM interworking subsystem.

ATM switching systems are being developed for the purpose of broadband multimedia services and have essential functions prior to the evolution into high speed networks. However, in order to accommodate existing voice subscribers and provide voice services, the functions of the PSTN switching system must be absorbed. Therefore, a sub-system for accommodating existing voice subscribers is required in an ATM switching system and software for controlling the same is required.

In the conventional ATM switching system, there is no subsystem and technology for accommodating voice subscribers, and a technique for converting and converting voice signals into ATM cells has been described.

The ATM interworking subsystem has a separate switch for accommodating voice subscribers, which is structurally and functionally distinct from ATM's self-routing switch, and requires a separate control method.

There are some problems to be solved in order to perform outgoing and incoming service of voice subscribers accommodated in ATM interworking system. First, the ATM interworking subsystem has a time switch connected by dividing voice subscribers into time slots, which follows the STM method rather than the ATM method. Therefore, a mapping method between heterogeneous switches is required for the voice subscriber to be connected to an ATM switch through an STM switch and to configure a call through an ATM cell. In addition, depending on whether the originating and terminating subscribers are accommodated in the same subsystem, it is necessary to determine whether the connection is through a ATM cell or a call using an internal channel of a time switch. In addition, a series of control methods for performing announcement service to voice subscribers accommodated in the ATM interworking subsystem, sending out a dial tone to the calling subscriber, connecting signaling equipment, receiving a number necessary for incoming call, and sending a ring to the called subscriber. This is necessary.

One or more ATM interworking subsystems may be connected to the ATM local switching subsystem. It is an object of the present invention to provide outgoing and incoming functions for voice subscribers housed within an ATM interworking subsystem. To this end, it performs subscriber control functions for the connection of tone, announcement, and signaling equipment, including the configuration of calls between calling and receiving subscribers.

1 is a block diagram of an ATM switching interworking subsystem to which the present invention is applied;

2 is a detailed connection configuration diagram between switches of an ATM switching system and an interworking subsystem;

3 is a flowchart for connecting a tone or signaling device to a voice subscriber of an ATM interworking subsystem;

4 is a flowchart for connecting an announcement to a voice subscriber of an ATM interworking subsystem;

5 is a flowchart of a call path configuration for an originating and incoming service of an ATM interworking subsystem;

6 is an information structure diagram transmitted by a calling / receiving subscriber to an interworking subsystem for configuration of a call path;

7 is a flowchart of an originating subscriber service accommodated in an ATM interworking subsystem;

8 is a flowchart of an incoming subscriber service accommodated in an ATM interworking subsystem.

<Explanation of symbols for main parts of drawing>

100: ATM Central Switching Subsystem (ACS)

110: Interconnect Exchange Network Module (ISNM)

200: connection exchange subsystem (ALS)

230: connection exchange network module (ASNM)

240: call connection control processor (CCCP)

300: Interworking Subsystem (IWS)

The service control method of a voice subscriber to the ATM interworking subsystem of the present invention for achieving the above object, the method of each IWS in the CCCP in the ALS to connect various tones and signaling equipment to the voice subscriber accommodated in the interworking subsystem of ATM It obtains channel of tone and signal equipment of corresponding IWS obtained from subscriber's time slot and requests it to be connected to TWS of IWS. In order to receive the announcement service, the voice subscriber accommodated in the interworking subsystem of the ATM checks the presence of the announcement equipment in the relevant IWS, connects to the subscriber's time slot in the same case, and switches the switch information to the announcement broadcasting control processor. It then makes a connection request to the channel it finds. In addition, it obtains information for creating a cell for making a call through an ATM cell between voice subscribers accommodated in the interworking subsystem of ATM, and shares information with the other subscribers. Therefore, the final call setup is performed by connecting the subscriber timeslot and the external channel, which is the information of the ATM cell, to each other. And, when the call is composed of voice subscribers accommodated in the interworking subsystem of ATM, the subscribers in the same IWS avoid the unnecessary generation of the ATM cell and transmit the pair of internal channels fixed to the time switch module of the IWS. Inversely assigned to each other to configure the IWS internal call path. In addition, in order to control the outgoing service of the voice subscriber accommodated in the interworking subsystem of ATM, it receives the call setup request, connects the dial tone and the signaling equipment, and requests translation of the incoming call number information through the signaling equipment to provide the incoming process and mutual information. Exchange and perform subscriber's normal calling service. In addition, in order to control the incoming service of the voice subscriber accommodated in the interworking subsystem of ATM, it checks the status of the line and call immediately after receiving the incoming occupancy notification, informs the occupancy by outgoing, connects the switch by exchanging switch information, and connects to the called subscriber terminal. Connect the ring, connect the ringback tone to the calling subscriber terminal to confirm the setting of the call channel, stop it when the called party responds, and connect the subscriber timeslot to the corresponding channel to finally configure the calling / called party's call path. .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an ATM switching system for accommodating voice subscribers in an ATM system.

Looking at the configuration, the Interconnect Switch Network Module (ATM), in which the ATM Central Switching Subsystem (hereinafter referred to as 'ACS') 100 performs system-wide operational maintenance, ISNM ') and an Operation Maintenance Processor (hereinafter referred to as' OMP') 120 connected to the ISNM 110.

In addition, an ATM Local Switching Subsystem (hereinafter, referred to as 'ALS') 200 is a BSIM (Broadband Subscriber Interface) connected to an ATM UNI (User-to-Network Connection) / NNI (Network to Network Connection). Module 210 and a BTIM (Broadband Trunk Interface Module 220) are connected to an Access Switch Network Module (ASNM) 230 and are connected to the ASNM 230 by a call connection control processor (Call). Connection Control Processor (hereinafter referred to as 'CCCP') 240 is connected.

In addition, the Inter Working Subsystem (hereinafter referred to as 'IWS') 300 is connected to an analog line access module (ALAM; ALAM) 310 to which the PSTN subscriber is connected. Time Switch Module (hereinafter referred to as 'TSWM') 320, and Signaling Service Module (Signaling Service Module, hereinafter referred to as 'SSM') 340 to accommodate the signaling equipment and announcement broadcasting equipment is connected Finally, an ATM Inter-Working Module (hereinafter referred to as AIWM) 330 is connected to the ALS 200 through the ASNM 230 and the IMI 160.

The IWS 300 is connected to one link of the ALS 200 connected to the ACS 100 by the IMI 150. The voice subscriber is accommodated in the IWS 300, the time switch, signal equipment, ring equipment, announcement broadcasting equipment, etc. are mounted and performs a matching function. The CCCP 240 of the ALS is a processor for controlling B-ISDN subscriber calls and relay calls and a voice subscriber control function for controlling call of an IWS voice subscriber to which the present invention is applied (Analog Subscriber Control NF: hereinafter referred to as 'ASCNF'). The processor is accommodated.

2 is a detailed connection configuration diagram between an ATM switching system and an IWS switch.

Interworking Subscriber Interface (Ana) (311), TI (Trunk Interface Processor; Trunk Interface) 312, Time & Local Switch Interface (TLSI) in IWS 300 A signal field matching processor (313) and a global service interface (GSI) integrated processor (314) are processors for matching with subscriber equipment, trunk line equipment, time switch and signaling equipment, and announcement broadcasting equipment, respectively. Perform the service according to the request sent at 240. The main functions of the AIWM 330 are voice data cell assembly / disassembly between the STM switch and ATM switch, and inter-processor communication (IPC) cell assembly / disassembly function between various device matching processors of the IWS and the CCCP 240. . Inter-Working Control Assembly (hereinafter referred to as 'IWCA') 331 is a control processor of the AIWM 330, which matches the global bus with other matching processors of the IWS 300. In the AIWM 330, the lower device is controlled through the VME bus. The IWCA 331 cellizes the IPC messages collected from the global bus using the ATM Adaptation Layer (AAL) for the IPC, and passes them through the ATM Switch Interface Assembly (hereinafter referred to as 'ASIA') 332. The ALS is transmitted to the CCCP 240 of the ALS and, conversely, the IPC cell of the ATM received from the ASIA 332 is reassembled in a message unit and distributed to each matching processor of the IWS 300. The cell assembly disassembly assembly (hereinafter referred to as 'CADA') 333 performs the AAL 1 cell assembly / disassembly function by connection (STM side: timeslot, ATM side: VPI, VCI). All control information necessary for assembly / disassembly of the cell is transmitted by the IWCA 331 through an update of the control memory of the CADA 333. In addition, the CADA 333 supports a multiple bit rate of n x 64 kbps and a partially-filled cell structure per connection, and simultaneously accommodates a maximum of 1,024 connections. The ASIA 332 distributes the user's data to the CADA 333 and the IPC cell to the IWCA 331 according to the cell indicator in the routing tag. Conversely, the user cell from the CADA 333 and the IPC cell from the IWCA 331 are multiplexed and then transmitted to the IMI. In addition, the PCST (PSTN Clock Generation Assembly) 334 receives the clock of the manipulator in the ALS 200 and provides it as a reference clock of the STM switch.

The whole system consists of three switch modules. The first switch module is the TSWM 320 present in the IWS 300, which includes a Time Slot Interchange board Assembly (hereinafter referred to as TSIA) 321, a control memory and a maintenance board assembly. and Maintenance board Assembly (hereinafter referred to as 'CMMA') 322 and Data Link Interface (hereinafter referred to as 'DLI') 323. The TSIA 321 is connected to various telephone devices (hereinafter, referred to as 'TDUs') accommodated in the exchange. TDUs refer to subscriber lines or relay lines. The CMMA 322 is connected to various service equipments in a subsystem and used when providing appropriate services to various TDUs. Of the 32 sub-highways of the CMMA 322, the first 20 sub-highways are allocated a total of 640 channels for constructing a call path using fixed channels therein when connecting subscribers accommodated in the same IWS 300. It is. These channels are called intra-junctor channels. The eight sub-highways are connected to a local service unit (hereinafter referred to as LSU), which supplies various tones and signaling equipment, and the other four sub-highways are connected to announcement and test equipment. It is. The data link connection (DLI) 323 has a total of 32 sub-highways allocated 1024 channels, and is used for establishing a call to the outside. The second switch is the switch in the ALS, which is an ASNM 230 connected to a B-ISDN subscriber, a relay line, or an IWS, and performing an internal exchange function in the form of an ATM cell. The IWS 300 to which the present invention is applied is connected through the DLI 323 of the TSWM 320. The last switch is an ISNM 110, which is embedded in the ACS 100 and is an ATM unit cell switch, connected to one or more ASNMs.

3 shows a flowchart for connecting a tone or signaling device to a subscriber.

Voice subscribers in an ATM interworking subsystem are connected to a time switch and each has an independent timeslot number. In the present invention, a maximum of 8192 subscribers per one IWS are assigned, so a local timeslot number of 0 to 8191 is allocated (1). The subscriber control processor may provide only a tone to a subscriber according to a situation, and in some cases, may simultaneously request a tone and signaling equipment. The reason why two devices can be connected to one voice subscriber at the same time is because the directions of the services are different. In other words, the tone may be connected only one way from the tone channel switch to the subscriber time slot. In the case of the signal equipment, the device receives the number requested by the subscriber. You only need to connect. Therefore, in terms of the time slot of the subscriber, the transmission channel (Tx Channel) and the reception channel (Rx Channel) of the subscriber's time slot are independently connected to receive a tone and transmit a desired number through signaling equipment. In the time switch module described in FIG. 2, since the tone and the signal equipment are provided, the channel number is fixed and assigned according to the type of the tone designated by the subscriber, so that the channel of the tone requested by the subscriber can be obtained. In this way, the channel is managed to obtain the currently available signaling equipment channel (2). Tx and Rx of the subscriber's timeslot are allocated the signaling equipment channel and the tone channel, respectively (3). If the subscriber requests only the tone, a dummy value is assigned to the transmission channel of the subscriber timeslot, and the tone channel is assigned only to the receiving channel. Finally, the connection is completed by requesting connection of the above information to TSI, which is a processor managing the time switch module in the IWS (4).

4 is a flowchart for receiving an announcement service from a voice subscriber accommodated in an ATM system.

In order to receive the announcement service, there must be an announcement device and a processor for controlling the announcement. As described above with reference to FIG. 2, the GSI processor controls the announcement broadcast apparatus. However, if the IBs and processors are installed in all IWSs, the service itself may be good, but it is inefficient in terms of economics and practicality of the system. Accordingly, in the ATM system to which the present invention is applied, a method of transmitting a guide broadcast to a voice subscriber mounted in all IWS connected to the ALS is provided with a guide broadcasting device and a processor in one IWS per ALS. 4 shows a flowchart for setting an announcement channel in terms of a subscriber who is a subject receiving an announcement service. The subscriber compares his / her IWS with his IWS based on the information received from the announcement broadcasting processor while knowing his time slot (5, 6). If it belongs to the same IWS, the route can be easily configured by obtaining the announcement channel number in the same manner as in FIG. 3 and connecting to the Rx channel of the subscriber timeslot (12, 13). However, in case of different IWS, conversion to ATM cell is inevitable because it must go through ASNM which is a switch module of ALS. However, unlike the general call / incoming service, the announcement service only needs to constitute a one-way path from the announcement device to the subscriber, and therefore, the subscriber processor to receive the announcement service provides information for establishing a route (7, 8, 9). If only the subscriber connects to the DLI channel of the time switch in which the path is set, the subscriber can receive the announcement service (10, 11).

5 is a flow chart for the configuration of the call of the calling and receiving subscriber.

First, assuming that the subscriber timeslot 14 and the other party belong to the same location, that is, the other subscriber knows only the ALS and IWS accommodated, regardless of the origination / reception, it is compared whether the subscriber belongs to the same IWS of the same ALS ( 15). If the subscriber belongs to different ALS or IWS, VPI and VCI values are allocated to the call, and a routing tag for routing to the ALS to which the corresponding subscriber belongs is created (16). Next, in order to be connected to the outside of the interlocking subsystem, a valid channel among the DLI channels, which is an external channel of the time switch module, is allocated (17). Since the DLI channel has a total aggregation ratio of 8: 1, it has a total of 1024 channel numbers for one IWS that can accommodate 8192 subscribers. Since all the information related to the switch setting is obtained, the other subscriber's information is received through the IPC (18), and the IWS requests the switch routing in the ATM system (19). In this case, information required by the IWS to generate an ATM cell will be described with reference to FIG. 6. Finally, the DLI channel and the counterpart's DLI channel number are assigned to the Tx and Tx channels of the subscriber timeslot, respectively, to complete the call setup by requesting connection to the TSI processor of the IWS (20, 21). If the subscriber belongs to the same IWS as the other subscriber, the calling subscriber control processor allocates a fixed pair of intra-actor channels (22) and designates the transmission channel and the receiving channel of the timeslot number of the self and the other subscriber in reverse. (23) Since the time switch connection is required, the incoming call does not require a separate switch connection request.

FIG. 6 shows information transmitted from an originating / receiving subscriber to the IWS for configuration of a call path. That is, the information for accessing the call from the IWS to complete the call setup in the ASCNF in the CCCP of the ALS, the processor controlling the subscriber.

The process of controlling the calling party and the called party must know each other's independently assigned VPI and VCI information (24, 25, 26, 27). This is necessary to identify the call at the end of routing through the ATM cell. In addition, since it is connected through the external switch of the time switch module of the IWS, it is necessary to know the channel connected to its own subscriber time slot assigned in the DLI to go out (28), and similarly, the channel in the DLI in the other IWS connected to the other subscriber. Information is needed (29). In fact, the information constituting the ATM cell is as described above, and the routing tag necessary for self-routing of the ATM cell is obtained through a separate library (30). The above information is necessary only when setting up a call between subscribers accommodated in different IWSs, and the call between subscribers accommodated in the same IWS is performed through the intra-channel channel in the IWS as described above. I don't need it.

7 shows a flow chart for a subscriber to an IWS to receive outgoing services.

When an outgoing call setup request is received from an Analog Subscriber Interface (ASI) 311 in the IWS, the ASCNF in the CCCP 240 of the ALS uses the number of the IWS and the logic of the line through the number of the processor requesting the origination. Extract numbers (31, 32). Check the state of the line corresponding to the logical number of the line, if available, to check the state of the call connected to the line (32, 33). If the state of the circuit and call is normal, the dial tone and the signaling equipment are connected to the calling subscriber line in the same manner as in FIG. If not, the announcement is sent to the calling subscriber in the same manner as in FIG. 4. After the status is confirmed, the number received from the subscriber is analyzed through the signaling equipment, and the subscriber's national number translation and the called number translation are performed (34, 35). When the number translation is successfully completed and the incoming occupancy notification comes from the called subscriber processor (36), it establishes the subscriber's call path by the method of FIG. 5 (37) and notifies the called party that the switch connection is completed (38). Then, when the called party answers, the call enters the busy state (39, 40).

8 shows a flowchart for receiving an incoming service by a subscriber accommodated in the IWS.

The incoming control processor is created when the number translation is completed and the occupancy request is received. After checking the state of the incoming line and call (41), the called processor informs the calling processor that the incoming call is occupied (42). Thereafter, a method of configuring a call path with the calling subscriber is performed as shown in FIG. At this time, the called processor transmits the ringback tone through the call path already configured with the calling subscriber to supply the ring to the called terminal through the ring supply device and to confirm the setting of the call path (44). When the called party answers, the supply of ringback tone connected to the called party's DLI channel is immediately stopped and the time slot of the called subscriber is connected with the corresponding DLI channel to configure the incoming call (45). Announce the answer (46) and transition to the busy state (47).

A subscriber accommodated in an ATM switching system may use an existing terminal only if it is an ATM dedicated terminal or has a separate access device. However, the PSTN interworking subsystem was configured to accommodate the entry-level voice telephones using the Plain Old Telephone Service (POTS) line, which is already used, in the ATM switching system without any additional equipment. Therefore, the subscriber receiving voice service is connected to the ATM exchanger by using the terminal and line currently used, and the call is made through the ATM system at the time of origination and reception, and the call is possible. By providing various tones, announcements, and rings, it is possible to provide the same level of voice service as voice subscribers accommodated in existing PSTN exchanges.

Claims (10)

In order to control the originating service of the voice subscriber accommodated in the ATM interworking subsystem (IWS), when a call origination request is received from the interlocking subscriber matching processor (ASI) in the IWS, a call connection control processor (ALS) of the access switching subsystem (ALS) A first step of extracting the IWS number and the logical number of the line through the number of the processor which requested the origination from the ASCNF in CCCP); A second step of checking a state of a line corresponding to the logical number of the line and checking the state of a call connected to the line if it is available; A third step of requesting connection of a dial tone and signaling equipment to the calling subscriber line if the line and call state is normal by confirmation; A fourth step of transmitting an announcement to the calling subscriber in case of abnormality by the confirmation; A fifth process of analyzing the number received from the subscriber through the signal equipment and translating the subscriber's station number and the called number after the status is confirmed; A sixth step of notifying that the switch connection is completed to the called party after constructing the subscriber's channel when the number translation is successfully completed and the called party occupancy notification is received from the called subscriber processor; And The call control method of the voice subscriber accommodated in the ATM interworking subsystem, characterized in that the call includes a seventh step of entering the busy state when the called party responds. The method of claim 1, Tone of the corresponding IWS obtained in the timeslot of the subscriber of each interworking subsystem (IWS) in the call connection control processor (CCCP) in the access exchange subsystem (ALS) in order to connect the tone or signaling equipment to the subscriber in the third step. And obtaining a channel of the signaling equipment and requesting the connection to the TLSI (Time Switch & Signaling Equipment Matching Processor) of the IWS. The method of claim 1, In the fourth process, in order to receive the announcement service, the voice subscriber checks the presence of the announcement broadcast equipment in the corresponding IWS, connects to the subscriber's time slot in the same case, and transfers the switch information to the announcement broadcast control processor in a different case. And requesting a connection on the obtained channel. The method of claim 1, The configuration of the currency in the sixth process, If its subscriber time slot is a subscriber belonging to the IWS of different access switching subsystem (ALS), it obtains information for creating a cell, shares information with the other subscriber, and at the end of the subscriber, A first step of establishing a final call by connecting a subscriber timeslot and an external channel, which is information of an ATM cell, to a time switch module; If the subscriber's own time slots are subscribers in the same IWS, avoid unnecessary generation of ATM cells, and assign a pair of internal channels fixed to the time switch module of the IWS inversely to the time slots of the calling and receiving subscribers. And a second step of constructing a call path. The method of claim 4, wherein The first step is, A first substep of comparing whether the subscriber timeslot is a subscriber belonging to the same IWS of the same ALS, regardless of origination and incoming; As a result of the comparison, if the subscriber belongs to the IWS of different ALS, the virtual path identifier (VPI) and the virtual channel identifier (VCI) value are allocated to the call and the routing tag for routing to the ALS to which the other subscriber belongs. Generating a second sub-step; A third sub-step of allocating a valid channel of a data link connection (DLI) channel, which is an external channel of the time switch module, to be connected to the outside of the interworking subsystem; A fourth sub-step of requesting the switch routing in the ATM system to the IWS after receiving the information of the other subscriber through the inter-processor communication (IPC); And A fifth channel that terminates call setup by requesting connection with ITL TLSI (Time Switch & Signal Equipment Matching Processor) processor by designating its DLI channel and DLI channel number of counterpart in transmission and reception channel of subscriber timeslot, respectively. Including substeps, The second step, A sixth sub-step, in which the timeslot is a subscriber belonging to the same IWS as the other subscriber, an allocated pair of intra-actor channels already fixed by the calling subscriber control processor; And And a seventh sub-step of requesting a time switch connection by specifying a transmission channel and a reception channel of the timeslot number of the self and the other subscriber in reverse with each other. . The method of claim 5, In the fourth sub-step, information transmitted from the originating / receiving subscriber to the IWS in order to generate an ATM cell includes its own VPI number, a destination VPI number, its own VCI number, a destination VCI number, its own time switch channel number, and an incoming call. A service control method for a voice subscriber accommodated in an ATM interworking subsystem, comprising a time switch channel number and a routing tag. A first process of notifying the originating processor that the incoming processor is occupied after checking the state of the incoming line and the call to control the incoming service of the voice subscriber accommodated in the ATM interworking subsystem (IWS); A second process of establishing a call path with the calling subscriber after the incoming occupancy notification; A third step of sending, by the called processor, a ringback tone through a call path already configured with the calling subscriber to supply a ring to the called terminal through the ring supply device and confirm the setting of the call path; A fourth step in which, when the called party answers, the ringback tone connected to the called subscriber's data link access (DLI) channel is immediately stopped, and the time slot of the called subscriber is connected to the corresponding DLI channel to configure the incoming call path; ; And And a fifth step of transitioning to a busy state after notifying that the incoming call has been answered by an originating process. The method of claim 7, wherein Constitution of the currency of the second process, If its subscriber time slot is a subscriber belonging to the IWS of different access switching subsystem (ALS), it obtains information for creating a cell, shares information with the other subscriber, and at the end of the subscriber, A first step of establishing a final call by connecting a subscriber timeslot and an external channel, which is information of an ATM cell, to a time switch module; If the subscriber's own time slots are subscribers in the same IWS, avoid unnecessary generation of ATM cells, and assign a pair of internal channels fixed to the time switch module of the IWS inversely to the time slots of the calling and receiving subscribers. And a second step of constructing a call path. The method of claim 8, The first step is, A first substep of comparing whether the subscriber timeslot is a subscriber belonging to the same IWS of the same ALS, regardless of origination and incoming; As a result of the comparison, if the subscriber belongs to the IWS of different ALS, the virtual path identifier (VPI) and the virtual channel identifier (VCI) value are allocated to the call and the routing tag for routing to the ALS to which the other subscriber belongs. Generating a second sub-step; A third sub-step of allocating a valid channel of a data link connection (DLI) channel, which is an external channel of the time switch module, to be connected to the outside of the interworking subsystem; A fourth sub-step of requesting the switch routing in the ATM system to the IWS after receiving the information of the other subscriber through the inter-processor communication (IPC); And A fifth channel for terminating call setup by requesting connection with ITL TLSI (Time Switch & Signal Equipment Matching Processor) processor by designating DLI channel number and DLI channel number of counterpart in transmission channel and reception channel of subscriber timeslot, respectively. Including substeps, The second step, A sixth sub-step, in which the timeslot is a subscriber belonging to the same IWS as the other subscriber, an allocated pair of intra-actor channels already fixed by the calling subscriber control processor; And And a seventh sub-step of requesting a time switch connection by specifying a transmission channel and a reception channel of the timeslot number of the self and the other subscriber in reverse with each other. . The method of claim 9, In the fourth sub-step, the information transmitted to the IWS by the originating / receiving subscriber to generate the ATM cell includes its own VPI number, the called VPI number, its own VCI number, the called VCI number, its own time switch channel number, and the called party. A service control method for a voice subscriber accommodated in an ATM interworking subsystem, comprising a time switch channel number and a routing tag.

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