JPS62120767A - Selection signal returning system - Google Patents

Abstract

PURPOSE:To expand the service range by returning a hooking sent from an incoming subscriber from an incoming exchange to an outgoing exchange in a signal form identified from a cut-off signal and returning a selection signal sent from the incoming subscriber from the incoming exchange to the outgoing exchange succeedingly. CONSTITUTION:When a station subscriber 4 finished for the talking with an extension subscriber 6 desires a talking with an extension subscriber 7 accommodated in a private branch of automatic exchange 1, after the extension subscriber 6 hooks off, a telephone number of the extension subscriber 7 is selected. When a central controller 26 in a private branch of automatic exchange 2 detects the hooking of the extension subscriber 6, a hook signal return device 261 sends a hook signal (h) to a relay line 31. When the central controller 26 receives a telephone number of the extension subscriber 7 from the extension subscriber 6, a selection signal transmission means 262 sends the telephone number to the relay line 31 as a selection signal. When the exchange 1 receives the hook signal (h) and the selection signal, a selection signal reception device 162 is started to attain talking between the extension subscribers 6, 7 based on the transmitted selection signal.

Description

[Detailed Description of the Invention] [Summary] Between automatic exchanges connected by a trunk line, a hook sent from a terminating subscriber is returned from the terminating exchange to the originating exchange in a signal format that can be identified as disconnection number 18. ,
Subsequently, the selection signal sent by the terminating subscriber can be returned from the terminating exchange to the originating exchange, thereby expanding the service range.

[Industrial application field]

The present invention relates to a selection signal return system between automatic exchanges connected by trunk lines.

In an automatic switching network in which two sets of automatic exchanges are connected by an inter-office trunk line, the telephone number, etc. of the terminating δ subscriber is selected (transmitted as No. 8) from the originating automatic exchange to the terminating automatic exchange. , the terminating IS subscriber's response signal or call clearing signal is sent back as a monitoring signal from the terminating automatic exchange to the originating automatic exchange, but the selection signal sent by the terminating subscriber is Previously, the message was not sent back to the originating automatic exchange.

Therefore, various services, such as incoming call forwarding service in automatic private branch exchanges, which are controlled by selection signals sent by the terminating subscriber during a call, are all limited to the terminating automatic branch exchange. There was a strong desire to expand the service to include d-side automatic exchanges.

[Conventional technology]

FIG. 4 is a diagram showing an example of a conventional transfer method.

In Figure 4, automatic private branch exchanges 1 and 2 relay
It is assumed that the automatic private branch exchange 1 accommodates the central office line 5.
゛Subscribers currently accommodated in the public communication network (hereinafter referred to as station subscribers 4)
When a call is received on the central office line 5 from a branch office line 5 and a connection is requested to an extension subscriber 6 accommodated in the automatic private branch exchange 2, a call is sent to the trunk line 5 from a trunk trunk (PVT) 13 set in the outgoing state. 31, the telephone number of extension subscriber 6 is selected 1 to trunk trunk (PVT) 21 which is set to receive calls.
8, and is transmitted from the office line 5 to the office line trunk (C0T
) 11, communication path p11 in communication network (NW) 12, trunk line trunk 13, middle m! 31, a connection route is set to the extension subscriber 6 via the trunk line trunk 21, the communication path p21 in the communication path 1ii (NW) 22, and the subscriber circuit (SLC) 23, and the connection path between the central office subscriber 4 and the extension subscriber is established. 6 becomes available for conversation.

When the station subscriber 4 who has finished the call with the extension subscriber 6 wishes to make a call with the extension subscriber 7 accommodated in the automatic private branch exchange a1, the extension subscriber 6 hooks up and then connects the extension subscriber. Select phone number 7.

When the central controller (CC") 26 in the automatic private branch exchange 2 detects the hooking of the extension subscriber 6, the central controller (CC") 26 in the automatic private branch exchange 2
2, hold the communication path p21 and set the communication path p22,
The hold music transmitted from the hold music trunk 25 is transmitted to the station subscriber 4.
In addition to sending it back to A trunk trunk (PVT) 24 that connects another trunk line 32 to Aircraft A
is selected and put into a calling state, and the telephone number of the extension subscriber 7 is transmitted to the automatic private branch exchange 1 as a selection signal to the trunk line 32 via the trunk trunk 24, and a telephone line p23 is established in the telephone line network 22. The subscriber circuit 23 and the trunk line trunk 24 are connected by setting.

In the automatic private branch exchange 1, a central control unit (CC)
16 receives the selection signal arriving from the relay vA 32 via the trunk trunk (PVT) 14 in the incoming state, calls the extension subscriber 7, and when the extension subscriber 7 answers, the call path! A communication path p12 is set within 1i12 to connect the middle line trunk 14 and the subscriber circuit (SLC) 15, thereby enabling communication between extension subscribers 6 and 7.

When the extension subscriber 6 notifies the extension subscriber 7 of the incoming call from the central office subscriber 4 and the call is restored, the central control unit 26 releases the communication paths p21 to 23 in the communication path network 22 and sets the communication path p24, A telephone call is enabled between a station subscriber 4 and an extension subscriber 7.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in a conventional transfer system, the selection signal (telephone number of extension subscriber 7) sent by extension subscriber 6 during a call is transmitted from central office subscriber 4 to extension subscriber 6.
A trunk line 31 for incoming calls is transmitted to the automatic private branch exchange 1 via a separate trunk line 32, and calls between the central office subscriber 4 and the extension subscriber 7 are transmitted within the automatic private branch exchange 2. The communication is carried out via the trunk lines 31 and 32 which are connected back by the communication path p24, which poses problems such as the trunk lines being occupied excessively and call losses increasing.

The above problem is caused by the trunk trunk 21 in the destination (g state)
From there, for the trunk trunk 13 in the outgoing state,
This is due to the fact that the selection signal cannot be sent back.

[Means for solving problems]

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

In FIG. 1, a hook sent from a terminating subscriber 300 is detected to the terminating (G-side automatic exchange 500), and a hook that can be identified as an existing supervisory signal is sent to the originating automatic exchange 200 via a trunk line 400. A hook signal return means 501 for returning a signal, and a selection signal sending means 502 for returning a selection signal sent by the called subscriber 300 to the calling side automatic exchange 200 via the trunk line 400 are provided. The automatic exchange 200 has a hook (J identification means 201) that identifies the hook signal returned from the terminating automatic exchange 500 via the trunk line 400, and a hook signal that is returned from the terminating side automatic exchange 500 via the trunk line 400. A selection signal receiving means 202 for receiving a selection signal to be selected is provided.

[Effect]

That is, according to the present invention, the selection signal sent by the terminating subscriber 3°O during a call is transmitted from the terminating side automatic exchange 5°O to the trunk line 4.
00 to the originating automatic exchange 200, various services such as transfer services by the originating automatic exchange 200 are possible, and the serviceability of the automatic switching network is improved.

〔Example〕

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

FIG. 2 is a diagram illustrating a transfer method according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a hook signal according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, within the central controller 26, a hook signal return mechanism 261 and a selection signal transmitter 262 are provided as a hook signal return means 501 and a selection signal transmitter 502, respectively. A hook signal identifying mechanism 161 and a selection signal receiving mechanism 162 are provided as hook signal identifying means 201 and selection signal receiving means 202, respectively.

In FIG. 2, when a call from a central office subscriber 4 to an extension subscriber 6 accommodated in an automatic private branch exchange 2 arrives on a central office line 5, a central office line trunk 11 and a telephone line within a telephone line network 12 are connected as described above. 1) 11, Medium! ! Line human rank 3, relay line 31,
Trunk line trunk 21, communication path p21 within communication path network 22,
The station subscriber 4 and the extension subscriber 6 are connected via the subscriber circuit 23 and a call is started.

In such a state, when the station subscriber 4 who has finished the call with the extension subscriber 6 wishes to talk to the extension subscriber 7 who is accommodated in the automatic local communication file, the extension subscriber 6 performs a call after completing the call. , select the telephone number of extension subscriber 7.

When the central controller 26 in the automatic private branch exchange 2 detects the hooking of the extension subscriber 6, the central controller 26 in the automatic private branch exchange 2 transmits the hook signal return mechanism 2.
61.

The hook signal return mechanism 261 transmits the disconnection signal C to the trunk line 31 for a duration Tl (for example, 32±1) as shown in FIG.
milliseconds) and a sufficiently distinguishable duration T2 (e.g. 16±
1 millisecond) and sets the trunk trunk 21 in the incoming state to the outgoing state.

In the automatic private branch exchange 1, the central control value = 16 is
The medium line 31 is transmitted via the trunk line trunk 13 which is in the outgoing state.
When receiving a hook signal arriving from the server, the hook signal identification mechanism 161 is activated to transmit the hook signal.

The hook signal identification mechanism 161 identifies the transmitted hook signal h.
Apart from IEA, it is in the outgoing state! ! Lineman rank 3
In addition to setting the incoming call state, the call route! The communication path pH in 1i12 is put on hold, a communication path p13 is set, the holding tone sent from the holding tone trunk 18 is returned to the subscriber 4, and the selection signal receiving mechanism 162 is activated.

On the other hand, in the automatic private branch exchange 2, the central controller 26
．． When receiving the telephone number of the extension subscriber 7 sent from the extension subscriber 6 following the search, it activates the selection signal sending means 262 and transmits the telephone number of the extension subscriber 7.

The selection signal sending means 262 sends the transmitted telephone number of the extension subscriber 7 as a selection signal from the trunk trunk 21 in the outgoing state to the intermediate @lA line 31.

In the automatic private branch exchange 1, when the central controller 16 receives a selection signal arriving from the trunk line 31 via the trunk trunk 13 in an incoming state, the selection signal receiving mechanism 1
62 and transmits the received selection signal.

The selection signal receiving mechanism 162 calls the extension subscriber 7 from the subscriber circuit 15 based on the transmitted selection signal, and when the extension subscriber 7 responds, sets up a communication path p14 in the communication path network 12 and connects the trunk line. A trunk 13 and a subscriber circuit 15 are connected to enable communication between extension subscribers 6 and 7.

When the extension subscriber 6 notifies the extension subscriber 7 of the incoming call from the central office subscriber 4 and the call is restored, the central control bag W26 sends a disconnection signal C to the trunk line 31 via the trunk line trunk 21, and at the same time disconnects the call path! The communication path p21 in 1i22 is released.

In the automatic private branch exchange 1, when the central controller 16 receives the disconnection signal C arriving from the trunk line 31 via the trunk line trunk 13, it restores the middle line trunk 13, releases the trunk line 31, and Channel pH in channel network 12
, p13 and p14 are released, and a communication path p15 is set to connect the office line trunk 11 and the subscriber circuit 15, thereby enabling the office subscriber 4 and the extension subscriber 7 to communicate.

As is clear from the above explanation, according to the present embodiment, when the extension subscriber 6 who is on a call selects the phone number of the extension subscriber 7 following the function call, the middle mwA 31 is sent to the automatic private branch exchange 2 from the automatic private branch exchange 2. The private branch exchange 1 can now transmit the link signal and selection signal (phone number of extension subscriber 7).
The automatic private branch exchange 1 selects the extension subscriber 7 based on the transmitted selection signal, and transfers the call from the central office subscriber 4 to the central mWA 3.
1 and 32 (FIG. 4) and the automatic private branch exchange a2, the load on the relays 131 and 32 is reduced, and the loss of transferred calls is reduced.

Note that FIGS. 2 and 3 are merely examples of the present invention; for example, the hook signal is not limited to a single pulse having mVt time T2, but mVt duration T3.
Numerous other variations are contemplated, such as a complex pulse form h' having a duration of 8.+-.1 milliseconds (for example, 8.+-.1 milliseconds), but in each case the effectiveness of the invention remains the same.

Further, the configurations of the automatic private branch exchanges 1 and 2 are not limited to those shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case. Furthermore, the service targeted by the present invention is not limited to transferring an incoming call from the central office line 5 from the extension subscriber 6 to the extension subscriber 7, and many other variations may be considered. In either case, the effects of the present invention remain the same.

〔Effect of the invention〕

As described above, according to the present invention, in the automatic switching network, the selection signal sent by the terminating subscriber during a call can be returned from the terminating side automatic exchange to the originating side automatic exchange via the trunk line in use, Various services such as transfer services can be provided by the automatic switching equipment on the originating side, thereby improving the serviceability of the automatic switching network.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a transfer method according to an embodiment of the present invention, FIG. 3 is a diagram showing a hook signal according to an embodiment of the Song invention, and FIG. 1 is a diagram showing an example of a conventional transfer method. In the figure, 1 and 2 are automatic private branch exchanges, 4 is a central office subscriber, 5 is a central office line, 6 and 7 are extension subscribers, 11 is a central office trunk (COT), and 12 and 22 are telephone network (N
W), 13.14.21 and 24 are trunk trunks (PVT), 15 and 23 are subscriber circuits (SLC)
, 16 and 26 are the central controller (CC), 17 and 27 are the main memory (MM), 18 and 25 are music-on-hold trunks, 31.32 and 400 are trunk lines, 100 is the originating subscriber, and 161 is the hook signal. identification mechanism, 162 a selection signal receiving mechanism, 200 an originating automatic exchange, 201 a hook signal identification means, 202 a selection signal reception means, 26
1 is a hook signal return mechanism, 262 is a selection signal sending mechanism,
300 is the called subscriber, 500 is the called side automatic exchange, 50
1 is a hook signal returning means; 502 is a selection signal sending means;
C is the cutting signal, 2ρθ
rθO book Kasugazuki door Kamisatozuya 1 concave

Claims (1)

[Claims] A calling side automatic switchboard (2) accommodating a calling subscriber (100).
00) and a terminating subscriber (300), the trunk line (4
In an automatic switching network having a terminating automatic exchange (500) connected to the originating automatic exchange (200) via a terminating automatic exchange (500), the terminating automatic exchange (500) is connected to the terminating subscriber (300). hook signal return means (501) for detecting hooking transmitted from the relay line (400) and returning a hook signal distinguishable from the existing monitoring signal to the originating automatic exchange (200) via the trunk line (400); The selection signal sent by the terminating subscriber (300) is sent to the originating automatic exchange (2) via the trunk line (400).
a selection signal sending means (502) for sending a return signal to the originating automatic switch (200);
hook signal identification means (2) for identifying the hook signal returned from the called-side automatic exchange (500) via the terminating automatic exchange (500);
01) and a selection signal receiving means (202) for receiving a selection signal returned from the terminating automatic exchange (500) via the trunk line (400). .