KR950003672B1 - Electronic exchange - Google Patents

Abstract

The device minimizes the program modification when updating the call control function by separately processing the basic service call control flow and the message conversion function. The method includes steps of; (a) processing TUP start address message and proceed to the waiting state to receive the arrival number; (b) processing the next TUP address message, transferring the received number, and proceeding to the waiting state; (c) processing the ISUP address receiving state and proceeding to the waiting state in response to the subscriber's call; and (d) processing the ISUP response message and proceeding to the calling state in response to the subscriber's reply.

Description

Interworking Method of Common Line (No.7) Signaling System of Electronic Switching System

1 is a software configuration diagram of an electronic switching system according to the present invention.

2 is a hardware configuration diagram of an electronic switching system to which the present invention is applied.

3 is a flowchart of a process of converting a TUP message into an ISUP message according to the present invention.

4 is a flowchart of a process of converting an ISUP message into a TUP message according to the present invention.

* Explanation of symbols for main parts of the drawings

1: originating exchange 2: relay exchange

3: incoming exchange 4,5,6: call control

7,8: DSS1 9,11: TUP signal control

10,12,14,16: MTP 13,15: ISUP signal control

21: INS 22: CCS

23,25: ASS-T 24: ASS-7

26: NPT 27: CIN

28: S-SW 29: TU

30: T-SW 31: NTR

32: ASP 33: TPI

34: TPC 35: CSU

36: UPI 37: UPC

38: RCO

The present invention provides an electronic switch that performs the function of a relay switch in an ISDN, wherein the signal information and network management information are separated from subscriber information such as voice and data and transmitted in a separate common signal channel. 7 Signaling Method A method for interworking between a telephone user unit (hereinafter referred to as TUP) and an ISDN user unit (hereinafter referred to as ISUP).

Conventionally, the decimal signaling method and the R2 signaling method are implemented as the inter-station signaling method of all electronic switchboards, so that various services for voice and voice can be provided to telephone users. As new and diverse services are required, it is necessary to establish a comprehensive information and communication network. 7 ISUP (ISDN User Part) is introduced to meet subscriber's new and diverse service needs. No. 7 For the economic and efficient operation of manganese with the introduction of ISUP signal system, 7 It becomes necessary to interwork between TUP (Telephone User Part) signaling method and ISUP signaling method.

Therefore, the present invention separates the ISUP basic service call control flow and the message conversion function when the TUP / ISUP message conversion or the ISUP / TUP message conversion is performed when receiving a TUP or ISUP message from the power station. No. to minimize modification 7 Its purpose is to provide the interworking method of TUP and ISUP.

In order to achieve the above object, the present invention performs an INS (Interconnection Network Subsystem) performing a centralized call processing function, a Central Control Subsystem (CCS) performing a centralized function of operation and maintenance of the system, and a distributed call processing function. No. of electronic switching system composed of ASS (Access Switching Subsystem) 7 A method of interworking a telephone user unit (TUP) and an ISDN user unit (ISUP); In the idle state, the first step of forwarding the incoming call number and the incoming call reception completion state after processing the TUP leading address message (SAM) when the subscriber is occupied in the idle state, and when dialing the subscriber in the incoming call forwarding and incoming call reception completion state. After the TUP subsequent address message (SAM) processing, the second step proceeds to the incoming call forwarding and reception completion wait state, and after processing the incoming subscriber ISUP address completion completion message (ACM) in the called party forwarding and incoming call completion completion state A third step of proceeding to the incoming call waiting state, a fourth step of proceeding to a busy state after processing an ISUP response message (ANM) when the called party responds in the incoming call waiting state, and a TUP to recover the calling party from the busy state In the fifth step of finishing after the recovery message (CLF) processing, in the busy state after the TUP backward multi-message (CBK) processing during the recovery of the called party in the busy state Sixth step proceeding to the state, the seventh step of proceeding to the incoming call forwarding and incoming call reception completion state after processing the ISUP leading address message (IAM) when occupied by the subscriber in the idle state, the incoming call forwarding and the incoming call reception completion wait Eighth step of proceeding to incoming call forwarding and incoming call reception completion state after processing ISUP Subsequent Address Message (SAM) when calling subscriber in state; ringing TUP address of called party subscriber in waiting call forwarding and incoming call completion completion state A ninth step of proceeding to an incoming call waiting state after processing of a reception completion message (ACM); a tenth step of proceeding to a busy state after processing a TUP response message (ANM) when the called party responds in the incoming call waiting state; Step 11 of proceeding to a busy state after processing a TUP post recovery message (CBK) when multiple incoming subscribers are in the busy state and originating from the busy state Particle recovery is characterized in that performed by the first step 12 (390 400 410) that the forward end ISUP Release message (REL) after the treatment.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a software configuration diagram of an electronic switch according to the present invention. 7 When TUP and ISUP interlock, it shows the configuration of exchange.

In the figure, 1 is an originating exchange, 2 is an intermediate exchange, 3 is an incoming exchange, 4, 5, 6 is call control, 7, 8 is DSS1 (Digital Subscriber Signaling System No. 1), 9, 11 is TUP signal control, 10 12, 14, and 16 represent MTP (Message Transfet Part), and 13 and 15 represent ISUP signal control, respectively.

When an originating subscriber attempts to make a call at an electronic switchgear, the call is established through a series of processes as follows. The DSS1 (7) receiving the subscriber information through the access line collects and analyzes the various information in the originating exchange (1) and transmits the information to the TUP signal control (9) when the TUP outgoing call is determined. The control 9 transmits a TUP signal message to a power station via a Signaling Data Link (SDL). The TUP control signal 11 having received the TUP signal message collects and analyzes various kinds of information in the relay switch 2 and transmits the information to the ISUP signal control 13 when the ISUP is determined, and receives the information. ) Transmits the ISUP signal message 13 to the power station via SDL.

Upon receiving the ISUP signal message, the ISUP signal control 15 collects and analyzes various kinds of information in the destination exchange 3 to determine the DSS1 self-signal, transfers the information to the DSS1 8, and receives the information. The call is connected to the called party through the line.

As a result of analyzing the TUP signal message information received by the relay switch 2 as described above, if the ISUP relay call is determined, interworking of the TUP and the ISUP occurs. In the overall configuration of the relay switch 2, a signal data link (SDL) is connected between the switch and the switch to transmit signals to the outside of the switch, and trunks are used to transmit voice and data. ) Are connected and inside the exchange, call control software blocks (5) that collectively control the flow of calls, TUP signal control (11) that controls TUP calls and messages, and ISUP signals that control and message ISUP calls. There is a control 13 and a message transfer part (MTP) 14 for processing functions of signaling messages transmitted and received with the power station.

2 is a hardware configuration diagram of an electronic switching system to which the present invention is applied, 21 is an INS (Interconnection Network Subsystem), 22 is a Central Control Subsystem (CCS), 23 and 25 is an Access Swithcing Subsystem-Trunk (ASS-T), 24 ASS-7 (Access Switching Subsystem-SS7), 26 is NTP (Number Translation Proceessor), 27 is CIN (Control Interworking Network), 28 is S-SW (Space-Switch), 29 is TU (Trunk Unit), 30 Is Time-Switch (T-SW), 31 is Number Translation (NTR), 32 is Access Switching Processor (ASP), 33 is Telephony User Part Interface (TPI), 34 is Telephony User Part Control (TPC), 35 is CSU (Common Channel Signaling Unit), 36 denotes UDN (ISDN User Part Interface), 37 denotes UPC (ISDN User Part Control), and 38 denotes RCO (Route Control).

The electronic switch according to the present invention has an INS 21 for performing centralized call processing as shown in FIG. 2, a CCS 22 for centralizing operation and maintenance of a system, and distributed call processing. It consists of three subsystems of ASS that perform functions.

The ISN (21) is a space switch and NTP (26) consisting of software blocks such as NTR (Number Translation) 31 for performing a number translation function of the call processing function and ROC (Route Control) for performing a route control function. It is composed of a space switch (S-SW) 28, which is a hardware that performs the connection and disconnection function, and a control interworking network (CIN) 27 for transferring messages between processors.

The ASS can accommodate up to 60 ASS-S, ASS-T, ASS-7 and the like, and is connected to the INS 21. The ASS-7 (23) includes a TU (29), a T-SW (30), and various signaling devices to perform call processing and maintenance functions. The ASS-7 (23) is composed of a plurality of processors. When looking at the functions of each processor, the TU (Trunk Unit) performs a function of transmitting and receiving an R2MFC or DC loop signal to match with a relay. (29) and T-SW (30) for connecting, cutting and testing the time switch, and No. 7 It consists of ASP 32 which is a processor that performs user part functions and network maintenance, test and maintenance management functions. The ASP 32 includes a number of software blocks such as the TPC 34, the UPC 37, the TPI 33, and the UPI 36.

Referring to the call control flow, when the relay switch 2 of the electronic switchgear interoperates with the No.7 signaling type TUP / ISUP, the relay switch 2 receives the TUP message to perform internal control and some message flow related to the call to support the ISUP message. It also explains the linkage with other software blocks.

All TUP messages received from the power station are converted into ISUP messages and sent to the power station after performing the following internal control. The TUP message is delivered to the CSU 35 of the ASS-7 via a signal data link (SDL) connected to the power station and the ASS-T and an internal fixed-up path connected to the ASS-T and ASS-7.

The CSU 38 delivers the TUP message to the TPI 33 of the incoming ASP through the internal message path, and the TPI 33 performs a TUP message format conversion function to deliver the TUP message to the TPC originating process. do. Converts TPC messages that have received TUP messages into system internal messages and uses the received message information from the RCO 38 and NTR 31 inherent in the NTP 26 via the internal message path as needed according to the call control flow. After performing the route information and number translation, the internal message is transmitted to the UPC incoming process 37 of the ASP where the outgoing line is accommodated. When the UPC incoming process receiving the internal message converts the internal message into an ISUP message using the message information, performs a call control function and delivers the ISUP message to the corresponding UPI 36, the UPI 36 converts the ISUP message format. After performing the operation, the ISUP message is transmitted to the CSU 35 through the internal message path, and the CSU 35 transmits the ISUP signal message to the power station.

3 is a flowchart illustrating a process of converting a TUP message into an ISUP message according to the present invention. Shows the processing and transmission flow of the message.

The relay exchange performs message conversion for each message received in a certain call state according to the operation of the called subscriber. Referring to FIG. 3 for the correspondence relationship and the conversion process of parameters during message conversion, the following is described.

In the message conversion process, the TPC originating process that receives the TUP message from the large station converts the message into an internal message first, and delivers it to the UPC incoming process. The UPC incoming process converts the internal message into an ISUP message. The parameters of the ISUP message maintain a one-to-one correspondence. The correspondence of the parameters in each message for each call state is described below.

The electronic relay exchange receives the TUP leading address message (IAM) from the originating exchange when it is occupied by the originating subscriber in the idle state (40) and converts it into an internal message first and converts it into an ISUP head address message (IAM). After 50 transfers to the destination exchange (60), the mutual correspondence of parameters during message conversion is shown in Table 1 below.

TABLE 1

The relay exchange of the electronic switching center receives a TUP follow-up address message (SAM) from the originating exchange during dialing of the originating party in the called party forwarding and the called party reception completion state (70), and converts it into an internal message (190). After the secondary conversion to the ISUP subsequent address message (SAM) (200) and to the destination exchange (210), the mutual correspondence of the parameters during the message conversion is shown in Table 2 below.

TABLE 2

The relay exchange of the electronic switching center receives an ISUP address reception complete message (ACM) from the destination exchange (80) at the ringing of the called party in the call forwarding and call reception completion completion state (70). After the secondary conversion, and the secondary conversion to the TUP address reception complete message (ACM) (90), and forwarded to the originating exchange (100), the correlation between the parameters in the message conversion is shown in Table 3 below.

TABLE 3

The relay exchange of the electronic switching center receives an ISUP response message (ANM) from the terminating exchange in response to the incoming subscriber in the incoming response waiting state 110 (120) and first converts it into an internal message and converts it into a TUP response message (ANU). After the secondary conversion (130) and forwarded to the originating exchange (140), the TUP response message (ANU) is a parameter does not exist, only the label and the door portion need to maintain a correspondence.

The relay switch of the electronic switchgear receives the TUP recovery message (CLF) from the calling switch in the busy state 150 and recovers the calling subscriber from the calling switch (160), converts it into an internal message, and converts it into an ISUP recovery message (REL). After conversion (170), the message is transferred to the destination exchange (180). Since the parameter in the TUP omnidirectional recovery message does not exist when the message is converted, only the label and the door keep the corresponding relationship to the ISUP recovery message, and the parameters in the electronic exchange recovery message are exchanged. It is only necessary to use the internal available information.

The relay switch of the switchboard receives the TUP backward recovery message (CBK) from the called switch in the busy state 150 and recovers the 230 message to the internal message. After the second conversion (250) to the originating exchange (250), the TUP backward recovery message (CBK) does not have any parameters and only the label and the door part need to maintain correspondence.

4 is a flowchart of a process of converting an ISUP message into a TUP message according to the present invention. Shows the processing and transmission flow of the message.

The relay exchange performs message conversion for each message that is received in a certain call state according to the operation of the called subscriber. Referring to FIG. 4, the relationship between the parameters and the conversion process during message conversion will be described.

In the message conversion process, the primary message is converted into an internal message between the UPC originating processes that have received the ISUP message, and the TPC receiving process converts the internal message into a TUP message. The parameters of the TUP message maintain a one-to-one correspondence. The correspondence of the parameters in each message for each call state is described below.

The relay switch of the electronic switchgear receives the ISUP head address message (IAM) from the originating switch in the idle state when it is occupied by the idler (270), first converts it into an internal message, and converts it into a TUP head address message (IAM). After the difference is converted (280) to the destination exchange (300).

TABLE 4

The relay exchange of the electronic switching center receives an ISUP follow-up address message (SAM) from the originating exchange during dialing of the originating subscriber in the called party forwarding and the incoming call reception completion wait state 300 (420). After converting the secondary to the TUP subsequent address message (SAM) (430) and forwarding to the destination exchange (440), the correlation between the parameters in the message conversion is shown in Table 5 below.

TABLE 5

The relay exchange of the electronic switching center receives a TUP address reception completion message (ACM) from the terminating exchange at the ringing of the called subscriber in the called party forwarding and the called party reception completion state 300 (310). After the second conversion and secondary conversion to the ISUP Address Receive Complete Message (ACM) (320) and forwarded to the originating exchange (330), the correlation between the parameters in the message conversion is shown in Table 6 below.

TABLE 6

The relay exchange of the electronic switching center receives a TUP response message (ANM) from the terminating exchange in response to the called subscriber in the incoming response waiting state 340 (350), converts it into an internal message, and converts it into an ISUP response message (ANU). After conversion (360) to the originating exchange (370), since there are no parameters in message conversion, only the label and the sentence keep the correspondence to the ISUP response message, and the parameters in the ISUP response message use only the available information inside the exchange. Display.

The relay switch of the electronic switchboard receives the ISUP omnidirectional recovery message (REL) from the calling exchange in the busy state 380 at the time of recovery of the calling subscriber (390), converts it into an internal message, and converts the TUP omnidirectional recovery message (CLF). After the second conversion (400) to the destination exchange (410), the TUP omnidirectional recovery message (CLF) is a parameter does not exist, so only the label and the door portion need to maintain a correspondence.

The relay exchange of the electronic switching center receives a TUP backward recovery message (CBK) from the terminating exchange during the recovery of the called subscriber in the busy state 380 and converts it to an internal message first and converts it into an ISUP abort message (SUS). After the secondary conversion (470), it is transferred to the originating exchange and proceeds to the busy state (480.490). Since the parameter does not exist in the message conversion, only the label and the sentence keep the correspondence to the ISUP abort message, and the parameters in the ISUP abort message are Only available information inside the exchange is displayed.

The present invention operating as described above is a no. 7 Numbering By combining TUP and ISUP by distinguishing call flow control function and message conversion function, it is possible to implement independently without affecting call control of UPC block. It is easy to apply, and the signal system between Decadic Pulse or R2 MFC station that is already implemented in the electronic switching system and No. It can be used as an implementation method when interworking with 7 signaling methods and can be applied as an implementation method when interworking TUP and ISUP in a system.

Claims (13)

Interconnection Network Subsystem (INS) 21 performing centralized call processing, Central Control Subsystem 22 performing centralization of operation and maintenance of the system, and ASS (Distributed Call Processing). Access Switching Subsystem) (23, 24, 25) of the electronic switchboard No. 7 A method of interworking a telephone use unit (TUP) and an ISDN user unit (ISUP); The first step (40, 50, 60, 70), the incoming call forwarding and the forwarding call forwarding after the processing of the TUP head address message (IAM) in the idle state and proceeds to the call completion completion state; A second step (190, 200, 210, 220) of forwarding the incoming call number and receiving completion after processing the TUP follower address message (SAM) when the subscriber dials in the call waiting completion state; A third step (80, 90, 100, 110) proceeds to the incoming call waiting state after processing the ISUP address reception complete message (ACM) at the time of the subscriber's ring, and after the ISUP response message (ANM) is processed during the incoming subscriber's response in the incoming call waiting state The fourth step (120, 130, 140, 150) to proceed to the state, the fifth step (160, 170, 180) to terminate after processing the TUP recovery message (CLF) when the outgoing subscriber recovery in the busy state, the busy state 6th step (230, 240, 250, 260) proceeds to the busy state after processing the TUP backward recovery message (CBK) during the recovery of the called party; In the seventh step (270, 280, 290, 300) proceeding to the reception complete wait state, the incoming call forwarding and the incoming call completion completion state in the waiting state of the calling party after the ISUP subsequent address message (SAM) processing in the incoming call forwarding and the incoming call reception completion wait state Eighth step (420, 430, 440, 450), the ninth step (310, 320, 330, 340) to proceed to the incoming call waiting state after processing the ringing TUP address completion message (ACM) of the called subscriber in the call forwarding and call completion completion state The tenth step (350, 360, 370, 380) to proceed to the busy state after processing the TUP response message (ANM) in response to the incoming subscriber in the call waiting state, the busy 11th step (460, 470, 480, 490) proceeds to the busy state after processing the TUP backward recovery message (CBK) when recovering the incoming subscriber in the state, and terminates after processing the ISUP omnidirectional recovery message (REL) when recovering the outgoing subscriber in the busy state. No. characterized in that performed by the twelfth step (390, 400, 410). 7 Interworking between the telephone user part and the ISDN user part. The method of claim 1, wherein the first step of processing the TUP head address (IAM) comprises receiving 40 a TUP head address message (IAM) when the outgoing subscriber is occupied in an idle state; No. 2, characterized in that the second conversion to the first address message (IAM) (50), and the step 60 of transmitting the ISUP first address message to the destination exchange. 7 Interworking method between telephone user part and ISDN user part. The method of claim 1, wherein the second step of processing the TUP follow-up address message (SAM) comprises receiving 190 a TUP follow-up address message (SAM) upon outgoing subscriber dialing, first converting to an internal message and following the ISUP. Secondary conversion into an address message (SAM) (200), and secondary conversion into an ISUP subsequent address message (SAM) by a destination exchange (200), and sending the ISUP address message (SAM) to a destination exchange No. characterized in that carried out by the step 210. 7 Interworking between the telephone user part and the ISDN user part. The method of claim 1, wherein the third step of processing the ISUP address reception completion message (ACM) comprises the steps of: receiving a length ISUP address reception completion message (ACM) of the called subscriber; Performing a secondary conversion into an address reception complete message (ACM) (90); and transmitting the TUP address completion message (ACM) to an originating exchange (100). 7 Interworking method between telephone user unit and ISDN user unit. The method of claim 1, wherein the fourth step of processing the ISUP response message (ANM) comprises receiving an ISUP response message (ANM) in response to an incoming subscriber (120), converting the message into an internal message, and performing a TUP response message (ANU). And a secondary conversion step (130), and transmitting the TUP response message (ANU) to an outgoing exchange (140). The method of claim 1, wherein the fifth step of processing the TUP recovery message (CLF) comprises the steps of receiving (160) a TUP recovery message (CLF) upon recovery of an originating subscriber, and converting the TUP recovery message (CLF) into an internal message. Performing primary conversion and secondary conversion into an ISUP recovery message (REL) (170), and transmitting the ISUP recovery message (REL) to a destination exchange (180). 7 Interworking method between telephone user unit and ISDN user unit. The method of claim 1, wherein the sixth step of processing the TUP backward recovery message (CBK) comprises: receiving a TUP backward recovery message (CBK) upon recovery of an incoming subscriber (230), and the TUP backward recovery message (CBK). ) Is first converted into an internal message and secondly converted into an ISUP recovery message (REL) (240), and the step (250) of transmitting the ISUP recovery message (REL) to an originating exchange. No. 7 Interworking method between telephone user unit and ISDN user unit. The method of claim 1, wherein the seventh step of processing the ISUP head address message (IAM) comprises: receiving (270) an ISUP head address message (IAM) when an outgoing subscriber is occupied; Primary conversion to message and secondary conversion to TUP head address message (IAM) (280); and sending (290) the TUP head address message (IAM) to a destination exchange. No. 7 Interworking method between telephone user unit and ISDN user unit. The method of claim 1, wherein the eighth step of processing the ISUP follow-up address message (SAM) comprises: receiving (420) an ISUP follow-up address message (SAM) during calling party dialing; Performing primary conversion to message and secondary conversion to TUP subsequent addresser message (SAM) (430), and transmitting (440) the TUP subsequent address message (SAM) to a destination exchange. No. 7 Interworking method between telephone user unit and ISDN user unit. The method of claim 1, wherein the ninth step of processing the TUP address reception completion message (ACM) comprises: performing a TUP address reception completion message (ACM) when the called subscriber rings; ) Is first converted into an internal message and secondly converted to an ISUP address reception complete message (ACM) (320), and a step 330 of receiving the ISUP address reception complete message (ACM) at a destination exchange. No. characterized in that 7 Interworking method between telephone user unit and ISDN user unit. 2. The method of claim 1, further comprising: receiving a TUP response message (ANM) 350 in response to an incoming subscriber response of the tenth step of processing the TUP response message (ANM), and firstly converting the TUP response message (ANM) into an internal message. Converting and performing secondary conversion into an ISUP response message (ANM) (360); and sending the ISUP response message (ANM) to an originating exchange (370). 7 Interworking method between telephone user unit and ISDN user unit. The method of claim 1, wherein the eleventh step of processing the TUP backward recovery ISUP (CBK) comprises: receiving a TUP backward recovery message (CBK) when the called subscriber recovers (460), and the TUP backward recovery message (CBK). ) Is converted by primary conversion and secondary conversion into ISUP abort message (SUS) (470), and forwarding the ISUP abort message (SUS) to an originating exchange (480). 7 Interworking method between telephone user unit and ISDN user unit. The method of claim 1, wherein the twelfth step of processing the ISUP omnidirectional recovery message (REL) comprises receiving (390) an ISUP omnidirectional recovery message (REL) when the subscriber is restored, and the ISUP omnidirectional recovery ISUP (REL). ) Is first transformed into an internal message and secondly converted to a TUP omnidirectional recovery message (CLF) (400), and a step (410) of transmitting the TUP omnidirectional recovery message (CLF) to a destination exchange. No. characterized in that 7 Interworking method between telephone user unit and ISDN user unit.