KR900003629B1 - Arrangements affording interim conversations between either the calling on the called party and a third party - Google Patents

Abstract

The method includes a call process (37,39,40,41) for providing dial tone to a first subscriber when the first subscriber is discriminated to have TWC function, for providing HOLD tone to a second subscriber and for providing RING signal to a third subscriber when the first subscriber dial to the third subscriber, a first conversation process (44,55,57) for constructing communication loop between the first and the third subscriber when the first subscriber is on hook flash state and for transmitting RING signal to the third subscriber, and a first path constructing process (50,61,63) for constructing loop including three subscribers when the third subscriber is answring.

Description

Tri-currency method of electronic exchange

1 (a) (b) (c) or a system connection diagram of a local call and an incoming call and an outgoing call of an electronic exchange.

2 is a system connection diagram of a three-way call according to the present invention.

Third (a) (b) or three-way call control flow chart according to the present invention.

4 is a system connection diagram of another embodiment of the present invention.

5 is a hardware block diagram of a MIOCN exchange system.

* Explanation of symbols for main parts of the drawings

1, 9, 1l: Line circuit

2, 3: Origination Juntor Circuit

4: Digit Receiver

5, 7: Terminating Juntor Circuit

6, 8: Outgoing Trunk Circuit

The present invention relates to a three-way calling method in which a subscriber connected to an electronic exchange allows a third person to make a call at the same time by calling a third party who wants to talk with another subscriber.

In general, the e-Exchanger call method is a method of making a local call between local subscribers, which is a connection of domestic calls, an incoming call from another exchange, which is an intermediary call connection, and a method of connecting from another country to another country. There was a way to make an outgoing call. The call connection in the domestic station and the inter-station relay call connection will be described with an example of an MlOCN exchange system that is configured as shown in FIG. 5 and is currently widely used.

5 is a block diagram of a part of the system hardware of the local electronic exchange which is widely used at present.

The exchange system having the same configuration as that of the fifth diagram is manufactured and tested by ITT series BTM of Belgium in 1967 and is mass-produced and supplied since 1972. The detailed operation thereof is omitted and the operation of hardware to help understanding of the present invention is omitted. (Reference: Electronic Exchanger with History of History, January 7, 1984, Electronic Exchange System issued by Cheongam, published December 15, 1985, Electronic Exchange Engineering, published by Oriental Science, June 30, 1984)

When making a call between local subscribers, the connection of the system is directly connected with a caller (CG) as shown in FIG. 1 (a) and a subscriber line circuit 10 for detecting the occurrence of a call, It is connected to the subscriber line circuit (10) of the CG side and the originating junction circuit (20) for transmitting various signals including talk current and busy tone, and command input for connecting the incoming local call. Terminating Tunnel Circuit 30 which processes and sends call current and Call Waiting from the Called Subscriber, and is directly connected to the Called Subscriber CD to detect call generation. The furnace 40 is comprised.

In addition, the connection of the system for executing a call from another country is as follows. Incoming Trunk Circuit (10 ') and the incoming relay circuit (10') for connecting with a local station when a call originating from another country occurs as in the first (b). 10 ') and the receiving jitter circuit 20' which processes the command input for connection with the incoming local or other station, and sends the call current and the standby signal to the called party CD. It consists of a subscription charity circuit (30 ') that is directly connected to the incoming subscriber (CD).

On the other hand, the connection of the system for making a call from the home country to another station is as shown in Fig. 1 (c). The system is directly connected to the calling party (CG) to detect the occurrence of the call and at the same time the busy state of the COR relay on the called party (busy free) Subscriber line circuit 10 " that detects the < RTI ID = 0.0 >), < / RTI > < Desc / Clms Page number 11 > It consists of an outgoing relay circuit 30 "that tests the use of the relay line according to the signal (Release Guard Signal) and calls out the subscriber from the exchange.

The call connection of the system as shown in FIG. 1 (a) is a state connection when the calling party (calling subscriber) CG calls a subscriber of the own station (accommodating subscriber of the same switching system). Control the call between the subscribers of the local station.

The description of the operation of the system for accessing domestic calls is described in detail in relation to the system of FIG. 5 on pages 152-270 of the reference (an electronic exchange issued by Geunhaksa, 1/7, 1984). In the contents, all operations between the subscriber line circuit 10, the outgoing jitter circuit 20, the incoming jitter circuit 30, and the subscriber line circuit 40 are described in detail.

On the other hand, when a call is received from another telephone company (other country), the incoming transcript circuit (10 ') of Fig. 1 (b) detects the incoming call and reports it to the CPU through TMF (Terminating Multi-Frequency). At this time, as is well known by the control of the CPU, a smooth communication with the other subscriber and the called subscriber (CD) of the local exchange is performed.

The call connection of the system as shown in Fig. 1 (c) is a call connection configuration when calling a local calling subscriber (CG) and a foreign subscriber, and the prefix (normal station number) dialed by the calling subscriber (CG). When dialed, the objection information is received by the digital receiver (DPR: DR) through the subscriber line circuit 10 " and the calling stop circuit 20 ". When the CPU receives the prefix number through the digit receiver (DPR), the CPU analyzes the prefix number and analyzes the information on the call connection such as the destination of the call, routing, and the like through the outgoing relay circuit (30 "). A call connection is sent. The signal through the outgoing relay circuit 30 " at this time is input to an incoming circuit (ITC) of a foreign exchange to form a communication path with a subscriber accommodated in the foreign exchange.

The detailed operation of the FIG. 5 system related to the inter-station relay call connection is also described on pages 271 to 274 of the near history generating electronic switch. However, in the call connection method as described above, the caller and the called party can easily talk to each other, and when they want to talk with a third party other than two people, the call must be disconnected and redialed to the third party. Therefore, the third party could not make a call at the same time. Accordingly, an object of the present invention is to provide a method in which a caller calls a third callee (a callee) during a call between a caller and a callee so that three people can make a conference call.

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

2 is a diagram illustrating a connection configuration of a system in a three-way call according to the present invention, wherein the first subscriber line circuit 1 for detecting the occurrence of a call and whether the detected call is a local call or a foreign call are needed by the calling party. First and second calling and terminating circuits (2) and (3) for monitoring the calling party's call while simultaneously sending out various tones to the calling party so as to perform a function, and the calling party's digits ( Digit) is received through the subscriber line (1) and the second outgoing stop (3) and the digital receiver (4) for processing the digits, and is input through the first and second outgoing stop (2) (3) The first and second destination jitter circuits (5) (7), which classify whether the call is a domestic call or a foreign country and provide the caller current to the incoming subscriber, and search whether the relay line is used according to the recovery monitoring signal, and maintain the openness of the call path. First and second outgoing circuits 6 and 8 for carrying out the first and second outgoing boats; Circuit 5 consists of 7, the second, third subscriber pivoted to 9, 11 to the input signal and outputting it from the complex delivery to the subscriber.

The hardware of FIG. 2 described above is also a known circuit as part of the system diagram of FIG.

On the other hand, Figure 3 (a) (b) is a three-party call control flow chart of the present invention prepared by applying the SIT (Specification and Description Language) of the CCITT.

Hereinafter, an example of the operation according to the present invention will be described in detail with reference to FIGS. 2, 3, and 5.

Now, between the subscriber CGS1 and the called subscriber CDS1 through the first subscriber line circuit 1, the first calling setter circuit 2, the first receiving jitter circuit 5 and the second subscriber line circuit 9, When the calling subscriber CGS1 hooks-flashes to make a three-way call during the call as in the process of FIG. 3 (31), the first subscriber line circuit 1 detects the hook-flash and the first hook-up flashes. The output signal is output to the two output jitter circuits (2) and (3). At this time, the CPU that scans the subscriber CGS1 connected to the subscriber line circuit 1 (the CPU of FIG. 5 has CPU A and CPU B, but this is only redundant and the operation is the same as that of a single CPU. The Peripheral Register (PER) and the Mixed Tester (MTR) receive the hook-flash from the first subscriber line circuit 2 in FIG. 33.

In step 33, the CPU detecting the hook-flash of the subscriber CGS1 searches for the subscriber having the three way conference (TWC) function in step 35. At this time, if the CPU searches for the subscriber having the TWC function, the subscriber class data is analyzed and searched. (Generally, the exchange has the subscriber's class, for example, long distance call permission data and special service permission data, etc.). has exist)

If the search result subscriber (CGS1) in the process of FIG. 3 (35) is a subscriber having a TWC function, the CPU transmits the first outgoing interrupt circuit (2) and the second through the PER and the MC (Marker Circuit) in step (37). The tone supply command is inputted to the transmission jitter circuit (3).

At this time, the first transmission jitter 2 inputting the tone supply command outputs a holding tone (HT), which is a command of the CPU through PER and MC, to the destination jitter 5 and the second transmission jitter circuit 3. The digit receiver DR 4 is connected to the calling party CGS1. In step 37, the CPU that sends the command outputs a dial tone generation command through a POR (Pool Register) and a FAD (Fast Driver), and at this time, the digit receiver 4 sends a command to the CPU command. By the second subscriber line circuit 3 to the subscriber (CGS1) transmits a dial tone.

In addition, the first destination jitter circuit 5, which inputs the holding tone HT output from the first transmission jitter circuit 2, receives the holding tone HT through the subscriber line circuit 9 of the called subscriber. CDS1).

Therefore, when the calling subscriber CGS1 having the TWC function makes a hook flash to conduct a three-way call during the call between the calling subscriber CGS1 having the TWC function and the called subscriber CDS1, the called subscriber CDS1 is the first calling interrupt circuit. The holding tone HT transmitted from (2) is heard, and the calling party CGS1 hears a new dial tone (Dial Tone: DT) in FIG.

When the calling party CGS1 confirming the dial tone DT dials the subscriber number of the third party by the above operation, the signal is digitized through the first subscriber line circuit 1 and the second outgoing interrupt circuit 3. It is input to the receiver 4.

The digit receiver 4 which inputs the digit through the said 2nd transmission stop circuit 3 inputs an input digit to a CPU through PTR (Pool tester) and POR for analysis and processing of a digit. At this time, the CPU inputs a digit in the third process of FIG. 40 through the POR. When the calling party CGS1 finishes dialing to call a third party, the CPU receives all of the digits through the above process, and the CPU which has completed the digit receiving of the second subscriber interrupt circuit 3 through PER and MC. The second receiver jitter circuit 3 and the second receiver jitter circuit 7 are connected to each other. 7) ring back tone is sent out; At this time, between the second transmission jitter circuit 3 and the digit receiver 4 is separated and disconnected by the command of the MC, the second transmission jitter circuit 3 and the second destination jitter circuit 7 and the incoming subscriber line circuit 11 is connected.

Therefore, the receiving subscriber CDS1 continuously listens to the holding tone HT supplied from the first transmission stop circuit 2 as shown in FIG. 3 (41), and the calling subscriber CGS1 having the TWC function is connected to the MC. As a command, the ringer (Ring bhck Tone; RbT) transmitted from the second destination jitter circuit 7 is heard, and the third party called subscriber CDS1 'receives the ring signal (from the second destination jitter circuit 7). Ring Current (RC) is audible through the incoming subscriber line circuit (11).

As described above, the ringtone RC is supplied to the called party CDS1 by the holding tone HT and the called party CDS1 ', which is a third party, so that the calling party CGS1 receives the ringback tone. When hook flash is generated, this signal is sent out to the first transmission stop circuit 2 through the subscriber line circuit 1, which is input to the CPO through the LTR (Lime tester) and PER. The CPU recognizes this in FIG. 43 (43) and the CPU that recognizes the flash marks the first source and stop circuit 2 in 45 through PER and MC. At this time, the first transmission stop circuit 2 which inputs the marking signal by the hook flash signal of the calling subscriber CGS1 stops the transmission of the holding tone HT and simultaneously transmits the ring from the second arrival destination circuit 7. The back tone RbT is inputted through the second transmission stop circuit 3 to be sent to the first destination stop circuit 5.

Therefore, both the calling subscriber CGS1 and the called subscriber CDS1 having the function of TWC hear the ringback tone RBT in the process of FIG. 47, and the third party called subscriber CDS1 'continues to receive the ring signal RC. The signal is received.

On the other hand, as described above, the incoming subscriber (CDS1 '), which is a third party under the condition that the incoming subscriber (CDS1'), in which the TWC calling party (CGS1) and the called party (CDS1) is a ringback tone (RBT) third party, listens to the ring signal (RC). When the user answers the handset (Hnad set), it is recognized by the CPU through the second subscriber line circuit 11, the second terminating circuit 7, MTR, and PER in FIG. At this time, the CPU marks the call establishment instruction in the process 61 with the PER and MC to the second outgoing jitter circuit 3 and the second incoming jitter circuit 7. At this time, the second terminating circuit 7 blocks the ring signal RC supplied to the terminating subscriber CDS1 'of the third party, and at the same time, the second terminating circuit 3 and the terminating subscriber CDS1' of the third party. And a call path so that a call can be made between the called party CDS1.

Therefore, when the TWC-capable calling subscriber CGS1 and the called subscriber CDS1 listen to the ringback tone RBT and the third-party recipient subscriber CDS1 'receives the ring signal RC and receives the ring signal, the third party receives the ring signal. When the subscriber CDS1 'lifts the handset and performs an off-hook to perform the three-party call in FIG. 63.

If the TWC-capable calling subscriber (CGS1) is hook-flashed after performing the three-way call as described above, this signal is immediately sent to the second calling jitter circuit 3 through the subscriber line circuit 1, and the second calling jitter. The signal of the circuit 3 is input to the CPU through LTR and PER. Therefore, the CPU recognizes the hook-flash of the subscriber CGS1 in the process of FIG. 65 through the above-described path. The CPU inputting the hook-flash transfers the call recovery between the subscriber CGS1 'and the subscriber CDS1 through the PER and the MC to the second originating circuit 3 and the second terminating circuit 7 (67). (Command) The second outgoing stop circuit 3 and the second destination settling 7, which input the call retrieval command, are restored to the finally formed call path by restoring the call path.

Therefore, when the TWC function holding subscriber CGS1 inputs the command by the hook-flash signal, the second transmission jitter 3 stops all the signals output to the second destination jitter 7 and thus the TWC function holding transmission. The subscriber CGS1 and the called party CDS1 maintain the first call state as shown in FIG. 3 (53), and the third party called party CDS1 becomes a free state.

On the other hand, as shown in the above-described process of FIG. 3 (41), the called subscriber CDS1 listens to the holding tone HT transmitted from the first transmission stop 2, and the third called subscriber CDS1 'receives the ring signal ( RC3 is supplied to listen to the ring signal, and the third party recipient CDS1 'is in a state where the TWC function-receiving subscriber CGS1 listens to the ringback tone RBT transmitted from the second destination 7. When answering with a hand set, this signaling signal is input to the CPU through the subscriber line 11, LTR and PER. At this time, the CPU recognizes the subscriber signal of the subscriber CDS1 'in the process of FIG. 3 (44). It inputs to the 2nd outgoing jitter circuit 3 and the 2nd incoming jitter circuit 7 through MC. At this time, the second outgoing jitter circuit 3 cuts off the back tone to be transmitted to the subscriber CGS1 and supplies the call current, and the ring signal (SDS) supplied to the called subscriber CDS1 'through the second incoming jitter circuit 7 It blocks the RC and simultaneously supplies the call current so that the call can be made between the subscriber having the TWC function (CGS1) and the third called party (CDS1 ').

Therefore, a call is made between the TWC calling party CGS1 and the third party called party CDS1 'in FIG. 57. At this time, when the TWC caller (CGS1) performs the hook flash, it immediately passes through the MTR and the PER through the PER and the MC in the process of 61 to the first terminating circuit 2 and the first terminating circuit 5. Output the formation command in currency. The first outgoing jitter circuit 2 and the first incoming jitter circuit 5 which have inputted the formation instruction by the call of the above process stop the sending of the holding HT transmitted to the subscriber CDS1 and at the same time the outgoing subscriber having the TWC function. A call is made between (CGS1) and the called party (CDS1) to make a trilateral call.

When the TWC caller (CGS1) hooks on "on" during the three-way call, the CPU recognizes the process through the subscriber line circuit (1), LTR, and PER in step 71. Sends a call recovery command to each jitter circuit in step 73. At this time, the first and second outgoing stop circuits 2 and 3 recover the state before the call to make the state of all callers as Free (75).

If only the incoming subscriber (CDS1) is hooked-on, it is recognized by the CPU through the subscriber line circuit 9 and LTR and PER in step 77. By sending the call recovery command to the first destination jitter circuit 5 in step 79 and restoring to the original state after a predetermined time elapses, only the called party CDS1 is free and the subscriber having the TWC function as shown in step 81 CGS1. ) And only the third called party (CDS1 ') are in a call.

On the other hand, when the third called party (CDS1 ') hooks-on, the CPU detects this in step 83. In step 85, the CPU detects the call recovery command PER and MC through the call recovery command PER. Send it out. At this time, the second destination jitter circuit 7 restores to the original state by the command of the CPD, so that the third destination subscriber CDS1 'is in a free state, and the TWC function retaining subscriber CGS1 and the destination subscriber are free. Only (CDS1) is in a call state as shown in FIG.

4 is a call connection state diagram of a system of the present invention when a called subscriber (CDS2) has a TWC, and the subscriber lines (100-200), 1000, outgoing interrupt circuits (400), (800), and terminating interruption circuits ( 500, 700, incoming circuit 300, outgoing relay 600, and digit receiver 900 perform call connection.

Therefore, between the calling subscriber CGS2 and the receiving subscriber CDS2, the subscriber line circuit 100 of the calling subscriber CDS2, and the receiving jitter circuit 700 of the calling jitter 400 and the receiving subscriber CW2 having the TWC function. When the third party call is made through the subscriber line circuit 1000 and the third party call is made during the call, the 'TWC called subscriber (CDS2) can execute the three-way call by executing the hook flash as described above.

As described above, the present invention receives a new dial tone by the caller who is rich in the function of the TWC to perform a three-way call with a third party subscriber during a call between the subscriber and the subscriber who has the TWC function. The subscriber who has the TWC function sends a digit and listens to the waiting sound and supplies the ring current to the third party subscriber so that the third party can make a three-way call in response to the user.

Claims (1)

In the three-way calling method of the electronic exchange, a subscriber grade determination process (31, 33, 35) of searching for a TWC function possessing subscriber authorization when the first subscriber hooks-flashes during a call between the first subscriber and the second subscriber. In the subscriber class determination process (31, 33, 35), if it is determined that the subscriber possesses the TWC function, the subscriber supplies the dial tone to the first subscriber, grants the holding tone to the second subscriber, and the first subscriber calls the third subscriber. A third party calling process (37,39,40,41) for transmitting a ring signal (RC) to a third party subscriber at the same time and transmitting a ringback tone (RBT) to the first subscriber; Ring (37, 39, 40, 41) in which the first subscriber transmits a ringback tone (RBT) to the first subscriber and the second subscriber upon hook flash and simultaneously transmits a ring signal (RC) to the third called party. A third incoming call in the back tone receiving process (43, 45, 47) and the third party calling process (37, 39, 40, 41). A first conversation process (44,55,57), wherein the particles form a communication path between the first subscriber and the third called subscriber at the time of ensuing, and transmit an air tone (HT) to the second subscriber; A first caller establishes a three-way communication path between the first and second subscribers and the third called party when the third called party is engaged by the ring current RC transmitted in the receiving process 43, 45, and 47. In the process of forming a three-way call (50, 61, 63), and when the first subscriber to the hook flash in the first conversation process (44, 55, 57), the first, second subscriber and third destination subscriber The third party call path forming process (59, 61, 63) and the ringback tone receiving process (43, 45, 47) to make a three-way call to the first subscriber hook flash in the third subscriber's call path Second conversation processes (49, 51, 53) for restoring and forming a call path between the first subscriber and the second subscriber; and forming the first and second trilateral calls. At 50,61.63 (59,61,63), the first subscriber recovers all of the channels on hook-on, and the second and third called party recovers the hook-ons on hook-on. Three-way calling method of the electronic exchange, characterized in that made by the recovery process (71 to 87).

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