JPH03214953A - Three-party talking system - Google Patents

Abstract

PURPOSE:To utilize a transmission line of a relevant exchange network effectively by setting three-party talking with a transmission line of a short distance at all times. CONSTITUTION:While a 1st subscriber 200a and a 2nd subscriber 200b are in talking, when the 1st subscriber 200a executes the operation requesting the 3-party talking including a 3rd subscriber 200c accommodated in a 3rd exchange 100c, a 1st distance between a 1st exchange 100a and the 3rd exchange 100c and a 2nd distance between a 2nd exchange 100b and the 3rd exchange 100c are compared with each other. When a comparison means 110 discriminates it that the 1st distance is smaller than the 2nd distance, a 3-party talking request means 120 requests the setting of a 3-party talking to a 3-party talking function provided to the 1st exchange 100a and when the comparison means 110 discriminates it that the 1st distance is larger than the 2nd distance, the 3-party talking request means 120 requests the setting of a 3-party talking to a 3-party talking function provided to the 2nd exchange 100b.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of the three-party communication system in a switching network consisting of a plurality of exchanges each having a three-party communication function, the three-party communication between subscribers accommodated in different exchanges is proposed. In order to use the transmission path as effectively as possible when making a call, the first subscriber is placed in the first exchange, and the second subscriber is accommodated in the second exchange. If, during a call with a second subscriber, the first subscriber performs an operation that requests a three-party call involving a third subscriber accommodated in the third exchange, the first distance between the three exchanges;
a comparison means for comparing a second distance between the second exchange and the third exchange; and a comparison means for setting a two-party call when the comparison means determines that the first distance is shorter than the second distance. If the comparing means determines that the first distance is longer than the second distance by relying on the two-party call function provided by the first exchange, the setting for the three-party call is dependent on the second exchange. A three-way call requesting means is provided, and when the second exchange is requested to set up a three-way call from the three-way call requesting means, the second exchange is equipped with a three-way call setting. The system is configured to provide a three-party call acceptance means for requesting a function.

[Industrial Field of Application] The present invention relates to an improvement of a three-party call system in a switching network consisting of a plurality of exchanges each having a three-way call function.

As one of the increasingly diversified functions of switching equipment, three-way calls are now in use, allowing a third subscriber to join the call while two subscribers are talking, and allowing the three subscribers to talk to each other. .

When this type of two-party call is performed between subscribers accommodated in different exchanges, it is desirable to make effective use of the transmission path.

[Conventional technology]

FIG. 4 is a diagram showing an example of a conventional three-party telephone call system.
FIG. 5 is a diagram illustrating a three-party call setting situation in FIG. 4.

In FIGS. 4 and 5, two subscribers accommodated in exchange 1 and a subscriber 2b accommodated in exchange 1 constitute one exchange (NW) 1.
The communication path Pea, ? A transmission path 3mb connecting exchanges 1m and 1, and a communication path pu set within the network (NW) llb that constitutes exchange 1b.
When the subscriber 23 performs a predetermined operation, i.e., footing, to request a three-party call in which the subscriber 2c accommodated in the exchange 1c participates while carrying out a two-party call via the exchange 1c, A hooking signal is transmitted from subscriber 23 to exchange l.

In the exchange 1, a central processing unit (CP) 12. When receiving the fu-noking signal transmitted from the subscriber, it activates the three-way communication unit 1218 and
1 1. The communication path p+a set in
ah and the communication path pub to the subscriber 2, and the dial signal sent by the subscriber 28 is sent to the signal transmitting/receiving unit (SSR) 15.ah via the communication path p3a. At the same time, the transmission tone generated by the transmission sound source 143 is supplied to the subscribers via the communication path p4■.

? When subscriber 2c hears the tone and dials the telephone number of subscriber 2c, subscriber 2c is called from subscriber 21 to exchange 1m.
A dial signal indicating the telephone number of c is transmitted.

In one switch, a central processing unit (CP) 12.
When receives the dial signal transmitted from the subscriber 21, the three-way communication unit 1211 analyzes the dial signal, identifies the exchange 1c that accommodates the subscriber 2c, and connects one exchange to the exchange 1e. 3 ac, and transmits the dial signal to the exchange 1c via the common line signal path 4 ac, and also transmits the dialing signal to the exchange 1c via the common line signal path 4 ac, and also transmits the dialing signal to the telephone conference circuit (CFC,) 16.
．． Select and capture the network (NW) 1 1. The communication paths p3m and pan set in the communication path p3m and pan are released to establish the communication paths psa and pya, and the communication paths p6.
subscriber 2 to the conference call circuit (CFC) 16.
The transmission line 38c is connected to the first terminal l613 of the conference call circuit (CFC) 16. Connect to the third terminal 163■.

In this state, the central processing system (CP) 12. ? Connection information storage area (CDB) provided for two-party calls
122. In response to the subscriber information 121 indicating the subscriber 21, a conference call circuit (CFC) 16. the first terminal 16 of
Teleconference circuit terminal information 116 indicating 11 is stored,
Further, corresponding to the subscriber information izb indicating the subscriber 2b, transmission line information 13ab indicating the transmission line 3 mb, and conference call circuit terminal information 116■ indicating the second terminal 1621 of the conference call circuit (CFC) 161. is stored, and further subscriber 2
Transmission line 3 corresponding to subscriber information tzc indicating c. Transmission path information 1 3ac and conference call circuit (CFC) 1
Telephone conference circuit terminal information 1 indicating the second terminal 1631 of 63
+6am is stored.

On the other hand, in switching equipment, the central processing system (CP) 1
2c receives and analyzes the dialing signal transmitted from the exchange 13 via the common line signal path 43c, selectively captures the subscriber 2c, transmits a paging signal, and connects the network (
NW) 1 Set a communication path p1c in 1c, and call sound source 1
The ringing tone generated by 7c is transmitted through communication path p+c and transmission path 3a.
c, communication path pta,? Conference Circuit (CFC) '16. and is supplied to two subscribers via the communication path p5■.

When the subscriber 2c that received the paging signal responds and the response signal is sent back to the exchange 1e, the central processing system (CP) 12c of the exchange 1c uses a known method to control the network (NW) 11. ．． The communication path p, within. , and set up communication path P2C, and connect subscribers 2m and 2c to communication path PSA and conference call circuit (CFC) 16. , communication path 97m, transmission path 3ac, and communication path pzc, and a response signal is returned to the exchange 18 via the common line signal path 4me.

Subscriber 2. After requesting subscriber 2c to participate in a call with subscriber 2b, hooking is performed again, and a hooking signal is transmitted from the two subscribers to exchange 1.

In one switch, a central processing unit (CP) 12.
receives the hooking signal transmitted from the subscriber 2m, the three-way communication unit 1213 calls the network (NW) 1.
1. Release the communication path pzm set in the
transmission lines 3 and 5 connected to subscriber 2b.
Teleconferencing circuit (CFC)16. Connect to the second terminal 1621 of.

As a result of the above, subscriber 2. , 2. and 2e and conference call circuit (CFC) 16. Three-way calls are possible through this.

[Problem to be solved by the invention]

As is clear from the above explanation, in the conventional three-way call system, when subscriber 21 performs an operation to request a three-way call with subscriber 2c participating, subscriber 2
ah, and subscriber 2c via the newly occupied transmission path 3ac to a teleconferencing circuit (CFC) 16. is connected to a conference call circuit (CFC) 16. with subscriber 21.
A three-way call will be set up via .

Therefore, as illustrated in FIG. 5(a), the transmission line 3bc connecting the exchanges 1b and 1e is the transmission line 3. , and if the distance is far compared to 3 mc, as mentioned above? Gotoku transmission line 3 ab, 3■wa and conference call circuit (CFC) 1
6. It is determined that the three-way call set up by In the case of a short distance, the three-party call set up as described above is not necessarily judged to be effectively utilizing the transmission path, and in particular, as shown in FIG. If subscriber 2c is accommodated in the same exchange 1b as subscriber 2, then subscriber 2c is accommodated in the same exchange 1b. Transmission line 3 between and 15. However, there was a problem in that the transmission path was being used redundantly for subscribers 2b and 2c, and the transmission path was clearly being used ineffectively.

An object of the present invention is to utilize transmission paths as effectively as possible when a three-way call is made between subscribers accommodated in different exchanges.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 100-, 100b and 100c are first, second and third exchanges each having a three-way call function, 200. , 200. and 200c represent the first, second and third exchanges 100. and 200c, respectively. , 100.
and subscribers accommodated in 100c.

Reference numeral 110 denotes comparison means provided in the first exchange 100m according to the present invention.

120 is a three-party call requesting means provided in the first exchange 1001 according to the present invention.

130 is a three-party call acceptance means provided in the second exchange 100b according to the present invention.

[Effect]

The comparison means 110 performs an operation of requesting a three-party call including a third subscriber 200C accommodated in the third exchange 100c during a call between the first subscriber 200 and the second subscriber 200b. The first distance between the first exchange 100a and the third exchange 100c and the distance between the second exchange 100b and the third exchange 10 when executed by the first subscriber 2008.
0C and the second distance between them.

The three-way call requesting means 120 sets the three-way call setting to the three-way call function provided in the first exchange 100 when the comparing means 110 determines that the first distance is shorter than the second distance. If the comparing means 110 determines that the first distance is longer than the second distance, the setting of the three-way call is dependent on the second exchange 100.

When the three-way call requesting means 120 requests the three-way call setting, the three-way call acceptance means 130 requests the three-way call function provided in the second exchange 100b to set up the three-way call.

Therefore, a three-party call is always set up using a short-distance transmission path, and the transmission path of the exchange network is effectively utilized.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a three-way communication system according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of the signal transmission and reception process in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, the first, second and third exchanges 100 . , 100. and as 100c,
Switches 1-, lb and 1e are shown, respectively, and the first, second and third subscribers 200. in FIG. ,
Subscriber 2-, as 200b and 200C, respectively.
2b and 20 are shown, and a comparison section 1233 as the comparison means 110 in FIG.
12, and a requesting unit l24, which serves as the three-party call requesting means 120 in FIG.
P)12. Also, as the three-party call acceptance means 130 in FIG. 1, an acceptance section 125b is provided within the central processing system (CP) 12b.

In FIGS. 2 and 3, there are a subscriber 21 accommodated in the exchange 18, a subscriber 2 accommodated in the exchange 1b, and a communication path p set in the network (NW) 11a.
ra, transmission line 3ab, and network (NW) 1
A communication path set within lb? Two-party call via UB
While executing k (2.-2b), when subscriber 2 performs a predetermined operation, i.e., hooking, to request a three-way call in which subscriber 2c accommodated in exchange 1c participates; A hooking signal hk is transmitted from subscriber 2 to exchange 1.

In the exchange 1, a central processing unit (CP) 12.
When it receives the hooking signal hk transmitted from the subscriber 2ll, it activates the three-way communication unit 121m, releases the communication path P+a set in the network (NW) IL, and connects the communication paths pza, pig and P4a. is set, and the waiting sound wt generated by the waiting sound source 131 is transmitted to the communication path pza.
, the dial signal dc sent by the subscriber 2 is supplied to the subscriber 2 via the transmission path 3 ab and the communication path plb, and is sent to the signal transmitting/receiving unit (SSR) via the communication path p3.
) 153, and the transmission sound source 14.
The dial tone dt generated by the subscriber 2 is supplied to the subscriber 2 via the communication path p4m.

The subscriber 28 who heard the dial tone dt is the subscriber 2c? When the telephone number is dialed, subscriber 2, to exchange 1. A dial signal dc indicating the telephone number of the subscriber 2c is transmitted to the subscriber 2c.

Switchboard 1. In the central processing system (CP) 12.
When receiving the dial signal dc transmitted from the subscriber 21, the three-way communication section 121m analyzes the dial signal dc, identifies the exchange 1c in which the subscriber 2c is accommodated, starts the comparison section 1233, and Compare the distance dme between ■ and 1c and the distance dbc between exchange Lb and 1c.

As a result of the comparison, the distance d,. If it is determined that is shorter than the distance dbc, the central processing system IE (CP) 121 uses the three-way communication section 121m to transmit the telephone conference circuit ( CFC)
16. , subscriber 2, and transmission line 3. subscriber 2, and transmission line 3 via b.

The subscriber 2c is connected to each subscriber 2c via the terminal 2c, and a desired three-way call is set up.

On the other hand, if it is determined that the distance dme is longer than the distance dbc, the central processing system (CP) 12. is the requesting department 124. and enter the phone number of subscriber 2c and the two-party call tk (2m
2,), a special address signal dcs' containing request information for a three-party call in which subscriber 2c participates is transmitted to exchange 1 via common signal path 4mb.

In this state, the central processing system (CP) 12. Connection information storage area (CDB) provided for three-way calls within
122. , transmission line 3 corresponding to subscriber information tza indicating subscriber 2m. Transmission path information 1 3MB indicating subscriber 2 is stored, transmission path information 1 3ml+ indicating transmission path 3 MB is stored corresponding to subscriber information izb indicating subscriber 2, and subscriber information 1 3ml+ indicating subscriber 2c is stored. Transmission path information 13mb indicating transmission path 3ro is stored corresponding to 1tC.

In the exchange 1, a central processing unit (CP) 12b
is the exchange 1. When receiving the special address signal dcs' transmitted via the common line signal path 4mb from Conference circuit (CF)
C) 16b and sends a special address confirmation signal acks' indicating that the setting of the three-party call requested by the special address signal dcs' is accepted to the common line signal path 4, .
It is sent back to the exchange 1m via the network (N
W) Release the communication path P+b currently set within 1 lb, set up the communication path pzb, and transmit the waiting sound wt generated by the waiting sound source 13, to the subscriber 2, via the communication path pzb. It also transmits a dial signal dc' indicating the telephone number of the subscriber 2c to the exchange 1c via the common line signal path 4bc, and also transmits a dial signal dc' indicating the telephone number of the subscriber 2c to the network (NW) 11. communication path p within
sb and Psb, reserve the communication path pab, connect the transmission path 38, to the first terminal 161ゎ of the conference call circuit (CFC) 16b, and connect the transmission path 3bc to the first terminal 161ゎ of the conference call circuit (CFC) t6b. Connect to the third terminal 163b.

In this state, the central processing system (CP) 12. Connection information storage area (CDB) provided for three-way calls within
122b, corresponding to the subscriber information 121 indicating subscriber 2, there is a message indicating a transmission path of 3 mb. channel information 1 3mb and conference call circuit terminal information i'+6+b indicating the first terminal 16lb of the conference call circuit (CFC) 16 are stored. Teleconference circuit terminal information 11 indicating the second terminal 162 of the circuit (CFC) 16b. , is stored, and further subscriber 2c
Corresponding to subscriber information 12C indicating transmission line 3 be, transmission line information 1 3bc indicating transmission line 3 be and conference call circuit (CFC) 1
Telephone conference circuit terminal information i indicating the second terminal 163 of 6k
rhsb is stored.

On the other hand, in a 1 m switch, the central processing unit (CP) 1
2. When receives the special address confirmation signal ack's transmitted from exchange@1b via the common line signal path 4mb, it releases the communication paths pza, 93m and Paa set in the network (NW) 11 and makes a call. Reset the path P+m.

As a result of the above, subscriber 2■ has a communication path P+a and a transmission path 3mb.
and conference call circuit (CFC) via call path p+b.
16b is connected to the first terminal 16lb.

On the other hand, in the exchange 1c, a central processing system (CP) 1
2. receives and analyzes the dial signal 6cf transmitted via the common line signal path 4bc from the exchange 1, and sends it to the subscriber 2.
At the same time, a communication path p+c is set in the network (NW) 11c, and the ringing tone rbt generated by the ringing sound source 17c is transmitted through the communication path pI and the transmission path 3, and the communication path p+c is selectively captured and the ringing signal rg is transmitted. Psb, conference call circuit (CFC) 1
6b, communication path P311, transmission path 3 ab and communication path p
0 to two subscribers.

When the subscriber 2c that received the paging signal responds and a response signal ans is sent back from the subscriber 2c to the exchange 1c, the central processing system (CP) 12c of the exchange IC uses a known method to , communication path p+c is released and communication path pzc is set up, and subscribers 23 and 2c are connected to communication path P+a, transmission path 3. b, two-party call tk (2a-2c
), and returns a response signal ans' to the exchange 1 via the common line signal path 4bc.

In the exchange 1b, a central processing unit (CP) 12b
transfers the response signal ans" transmitted from the exchange 1o via the common line signal path 4bc to the exchange 1 via the common line signal path 4.b.

Switchboard 1. In the central processing system (CP) 12.
When the exchange 1 receives the response signal ans transmitted via the common signal path 4mb, the subscribers 21 and 2
The subscriber 21 starts being billed for the telephone call to and from the subscriber 21.

Subscriber 2. After requesting subscriber 2c to participate in a call with subscriber 2c, subscriber 2c attempts hooking again. From exchange 1. A hooking signal hk is transmitted to.

In the exchange 11, the central processing system f (CP) 12m
When receiving the hooking signal hk transmitted from the subscriber, the requesting unit 1243 transmits the hooking signal hk to the common line signal path 4. The hooking signal hk' is transmitted to the exchange 1b via b.

In the exchange 1b, the central processing system unit (C?) 12b
is the exchange 1. When the hooking signal hk' transmitted from the subscriber 2b via the common line signal path 4 mb is received, the communication path Pzb being set in the network (NW) 1 lb is released, the communication path pab is set up, and the communication path Pzb is set up in the network (NW) 1 lb. The conference call circuit (
CFC) 16b.

As a result, subscribers 2-, 2b, and 2c can make a three-way call t k (2
．． -2b-2c) becomes possible.

When subscriber 2, who has terminated the three-way call tk (2-2b 2e), recovers, a disconnection signal disc is transmitted from subscriber 2 to exchange l.

In the exchange 1, the central processing system (CP) 12
When receiving the disconnection signal disc transmitted from the subscriber 2, the connection information storage area (CDB) 122 and the network (NW) 1 1. At the same time, a disconnection signal "disc" is transmitted to the exchange 1b via the common line signal path 4ab, and the subscriber 2,
and 2c for calls to and from subscriber 2. Terminate billing for.

In the exchange 1, a central processing unit (CP) 12b
is the common line signal path from the exchange 1 to 4. When the disconnection signal disc' is received via the connection information storage area (CDB) 122b and the conference call circuit (CFC) by a known method,
)1 6b, the communication paths T)3b, p4b and p%b currently set in the network (NW) llb are released, and the exchange l. and sends back a recovery completion signal rec' to subscriber 2, and also sends a busy tone b to subscriber 2.
t, and further transmits a disconnection signal disc' to the exchange lc via the common line signal path 4bc.

Also in the exchange lc, the central processing system (CP) 12c
When receiving the disconnection signal "disc" from the exchange 1 via the common line signal path 4bc, it releases the communication path Pgc being set in the network (NW) 11c by a known method, and also disconnects the common line signal path. A restoration completion signal rec° is returned to the exchange 1b via 4bc, and a busy tone bt is transmitted to the subscriber 2e.

Subscribers 2 and 2c who heard the busy tone bt are restored, and all three-party calls are restored.

As is clear from the above explanation, according to this embodiment, when subscriber 2, who is currently talking with subscriber 2, requests a three-way call in which subscriber 2c participates, the comparison unit l23@ The distance dac between 11 and the IC is compared with the distance dbc between the exchanges 1b and 1c, and if it is determined that the distance dac is longer than the distance dbc (the situation shown in Fig. 5(b)), the exchanger When exchange 1 receives the request for setting up a three-way call, transmission line 3. , and 3
In order to connect subscribers 21 and 2b to the conference call circuit (CFC) 16b via be and set up a three-way call with subscriber 2b, transmission line 38 is used as in the conventional three-way call system.
, and 3 ac via conference call circuit (CFC) 1
Compared to the case where subscribers 2 and 2C are connected to 6, and a two-party call is established with subscriber 2m, a shorter transmission path is used, and the transmission path is used more effectively.

Note that FIGS. 2 and 3 are only one embodiment of the present invention, and for example, the subscriber 2t is not limited to that accommodated in the exchange lc, and is illustrated in FIG. 5(C). It is also contemplated that subscriber 2c may be accommodated in exchange 1, as shown in FIG. Only transmission line 3.

Although many other modifications may be considered, such as being accommodated in the conference call circuit (CFC) 16b via the CFC, thereby making more effective use of the transmission path, the effects of the present invention can be achieved in any case. remains unchanged. In addition, the central processing system If (CP) 12
．． is not limited to unconditionally requesting the exchange 1k to set up a three-way call when the distance aI a - c is longer than the distance Md; If the conference call circuit (CFC) 16b fails to capture the special address confirmation signal
The exchange 1, which has received the unconfigurable signal, sends back the unconfigurable signal instead of the unconfigurable signal, and the exchange 1, which has received the unconfigurable signal, calls the three-way communication unit 121, as in the conventional case. transmits subscribers 2k and 2c by . Road 3, and 3
Teleconferencing circuit (CFC) via ac16. Although many other variations may be considered, such as connecting to the subscriber 21 and setting up a two-party call with the subscriber 21, the effects of the present invention remain the same in either case. Furthermore, first, second and third exchanges 100. which are the object of the present invention. , 100k, 100c and the switching network are not limited to those shown in the drawings. [Effects of the Invention] As described above, according to the present invention, a three-party call is always set up through a short-distance transmission path in the switching network, and the transmission path of the switching network is effectively utilized. ．．

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, and FIG. 2 is a diagram showing the principle of the present invention.
FIG. 3 is a diagram showing an example of the signal transmission and reception process in FIG. 2, FIG. 4 is a diagram showing an example of the conventional three-way communication system, and FIG. FIG. 3 is a diagram illustrating a three-party call setting situation in the figure. In the figure, 1-, lb and lc are exchanges; 2. ,
2b, 2c, 200. , 200, and 200c are subscribers, 3o, 3bc, and 3mc are transmission lines, and 4ah
s4bC and 4 ac are common line signal paths, 11. , 11
b and 11c are networks (NW); 12. , 12
b and 12c a central processing unit (CP); 13. and 13b is a waiting sound source; 14. is the transmitting sound source, 15. 16 and 161 are conference call circuits (CFC); 17c is a ringing sound source; 100. , 100
k and 100c are the first, second and third exchanges, 1
10 is a comparison means, 120 is a three-party call requesting means, 1211
and 121b is a three-way communication unit, l22. and 122,
is a connection information storage area (CDB), 123. is the comparison part, 1
24. Figure 1 is the underwriting foil 3.

Claims (1)

[Scope of Claims] In a switching network consisting of a plurality of exchanges having a three-way call function, the first exchange (100_a) is provided with a first exchange (100_a).
During a call between a first subscriber (200_a) accommodated in 00_a) and a second subscriber (200_b) accommodated in a second exchange (100_b), a third subscriber (200_a) accommodated in
said first subscriber (200_c) to request a three-way call involving a third subscriber (200_c) accommodated in said first subscriber (200_c).
When a) is executed, the first exchange (100_a
) and a third exchange (100_c) and a second distance between the second exchange (100_b) and the third exchange (100_c);
110), when the comparison means (110) determines that the first distance is shorter than the second distance, the three-way call setting is set to a If the comparison means (110) determines that the first distance is longer than the second distance, the third-party call function is set to the second exchange (100_b). a three-party call requesting means (120) for making a request, and when the second exchange (100_b) is requested to set up the three-party call from the three-party call requesting means (120), the third-party call requesting means (120) The call settings are set at the second exchange (100
A three-party call system characterized by providing a three-party call acceptance means (130) that requests a three-party call function provided by _b).