JPS62269463A - Informing system for caller information in automatic exchange - Google Patents

Abstract

PURPOSE:To improve service for a subscriber, by sending a bit of caller information to a callee terminal in a period where a call signal is absent, at the time of sending a call signal when a call arrives at the callee terminal. CONSTITUTION:At the incoming time of the call at a callee terminal 16, the bit of caller information is sent out from an information sending circuit 38 in a line circuit 14 in the period where the call signal is absent. A callee subscriber can recognize a caller number displayed on a terminal equipment 16 at the responding time of an incoming call. In a case of denying the call by a callee, a momentary ring trip signal is sent to a subscriber line 18, for example, by performing the momentary off-hook of the handset of the terminal 16. A control circuit 10 for common processing judges the denial of the call by the callee subscriber by the above operation, and connects a busy tone trunk 22 to a caller subscriber terminal 16 by controlling a channel 12. In this way, inconvenience such as a charging on a subscriber whose call is denied by the callee, is eliminated, and the service for the subscriber with more convenience can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a system for notifying calling party information to a called telephone terminal in an automatic switching system, and particularly in a telephone switching system.

(Prior Art) In conventional telephone exchanges, when a call arrives at a called party's telephone terminal and the called party responds to the paging signal, a multi-frequency signal, audio signal, etc. is sent from the calling party notification trunk to the called party's telephone terminal. Some were configured to transmit caller information such as the calling number.

In this type of exchange, the central processing unit that controls the communication path network transfers the stored calling party number to the calling party notification trunk when a call is received at the called terminal. The calling party notification trunk is then connected to the called party terminal through a communication path, and the called party terminal is called from the calling party notification trunk.

When the called party answers, the calling party number is sent from the calling party notification trunk to the called party terminal. During this time, a ring trunk is connected to the calling party terminal via a communication path, and a ring tone is transmitted. If the called party continues to off-footer, the central processing unit controls the call path, disconnects the caller notification trunk and the ringer trunk, and establishes a call path between the calling terminal and the called terminal. do.

(Problems to be Solved by the Invention) In this conventional system, the calling party number arrives at the called party's terminal after the called party answers. Therefore, if the called party knows the calling party's number and wishes to reject the call, -E will restore the answered call. Therefore, in an automatic switching system that starts charge registration after the called party answers, at least one charge is registered even if the call is rejected. This is problematic for subscriber services in that it charges for calls that are not actually made.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a caller information notification system for an automatic switching system that eliminates the drawbacks of the prior art and improves subscriber services.

(Means for Solving the Problems) In order to solve the problems mentioned above, the present invention provides a caller information notification system for an automatic switching system that notifies a called party of information about the calling party. When a call occurs, information about the caller is obtained, and when the call arrives at the called party's terminal and a ringing signal is sent to it, the calling party information is transmitted to the called party during the period when there is no ringing signal. The feature is that it is sent to a terminal.

(Function) According to the present invention, when a call arrives at a called party's terminal and a ringing signal is sent to the terminal, information such as the calling party's number is transmitted immediately before the sending of the ringing signal or during a pause period such as the silent state. For example, it is sent to the called party's line in the form of a multi-frequency (MF) signal.

When the called party rejects the call, a call rejection signal, such as an instantaneous ring trip, may be sent, and this may be detected, for example, by the line circuit of the exchange.

(Embodiment) Next, an embodiment of the caller information notification system for an automatic exchange according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2, there is shown an embodiment of an automatic switching system to which the calling party information notification method according to the present invention is applied. In this embodiment, a plurality of line circuits 14 are accommodated on the line side of a communication path network 12 whose communication connections are controlled by a common processing control circuit 1o. A telephone terminal 16 such as a telephone set is connected to each of the line circuits 14 by a subscriber line 18 . The communication path network 12 is a time division switch in this embodiment.

The line circuit 14 will be described in detail later with reference to FIG.
It accommodates the subscriber line 18, and has functions such as normal line circuit functions such as power supply and monitoring, as well as functions such as sending out a calling signal, sending out information such as calling party information, and detecting communication current, and performs common processing. It is controlled by a control circuit 1o.

The common processing control circuit 10 is a processing system device that controls the entire exchange and performs call processing on the exchange.

The trunk side of the communication path network 12 accommodates various trunk circuits, such as trunk trunks to other stations (not shown) and service trunks such as a ring trunk 20 and a busy trunk 22, for example. . In the same figure,
To avoid complexity, only those trunk circuits that are relevant to the present invention are shown.

In this embodiment, in order to eliminate the drawbacks of the conventional method described above, when calling the called party's terminal 16, the calling party information is sent from the line circuit 14 before the called party responds.

is configured to do so. Calling, calling party 2
For example, a ring tone trunk 20 is connected to the terminal 14 via the communication path 12 (dotted line 24), and if the called party refuses the connection, the busy tone trunk 22 is connected to the calling party terminal 14 via the communication path 12.
(dotted line 26). If you do not refuse,
A call bus is established between the calling party and the called party, as shown at 928 .

Referring to FIG. 1, the line circuit 14 has a communication current supply detection circuit 30 and a communication line 32, to which the LA line and LB line of the subscriber line 18 are connected from the telephone terminal 16 to the relay contacts r and T. connected via the host. The communication current supply detection circuit 30 is a circuit that supplies communication current to the subscriber line 18, detects and monitors the loop current, and notifies the detected line state to the common processing control circuit IO through the control line 34. The detection circuit 30 has a function of detecting a call rejection signal, which will be described later, in addition to detecting a normal ring trip state. Note that the communication path 12 accommodates a large number of line circuits 14 and trunk circuits corresponding to the traffic, but other circuits are not shown in order to avoid complicating the diagram.

The relay contact r is a contact operated by the relay coil R, and the relay R is driven by the common processing control circuit 10, and is used to draw the subscriber line LA in order to send out a paging signal and calling party information. This is a call signal sending relay.

In addition, the relay contact T is a contact that operates in the relay coil RV, and the relay RV is also a common processing control circuit l.
A polarity reversal relay driven by O to reverse subscriber lines LA and LB. In the figure, relay contacts are represented by lowercase letters of the alphabet, and the coils that operate the relay contacts are represented by corresponding uppercase letters.

The secondary side of the communication line ring 32 is connected to the line side of the communication path network 12 via the codec circuit 3B. The codec circuit 36 encodes the two-wire analog signal arriving from the subscriber line 18 into a corresponding digital signal and sends it to the communication path 12, and also converts the digital signal received from the communication path 12 into a corresponding two-wire signal. This is an encoding/decoding circuit for decoding.

The subscriber line LA drawn in at the relay contact r is connected to the ringing signal device OR and the information sending circuit 38 via the relay contact ir. The relay contact ir is a contact operated by the relay coil IR, and the relay IR is driven by the common processing control circuit IO, and receives both the calling signal from the calling signal device CR and the caller information from the information sending circuit 38. This is a call signal device switching relay that selectively sends a signal to the subscriber line LA. The ring signal device CR is a ring signal source that generates a normal ring signal in which an AC signal of, for example, 18 Hz is intermittent with a meter period of 1 second and a break period of 2 seconds.

The information sending circuit 38 transmits various information to be sent to the subscriber terminal 16, for example, in this embodiment, when the subscriber terminal 1B is the called party terminal, information regarding the calling party such as the calling subscriber number. This is a signal sending circuit that sends out a multi-frequency signal. The information to be sent is generally obtained by the common processing control circuit 10 on various occasions in the form of the accommodation location information of the calling party's terminal, information received from the calling station, etc.; Transferred to 38. The information sending circuit 38 sends this as a multi-frequency signal to the LA line.

Explain the operation. When a call is received at, for example, a subscriber terminal 16 in normal call processing, the common processing control circuit 10 transmits the obtained calling party information, for example, the number of the calling terminal 16 to the called terminal through the data line 40. Corresponding line circuit 1
The information is transferred to the information sending circuit 38 of No. 4, and its relay R is driven.

In the line circuit 14, the subscriber line LA is drawn to the signal line 42 side by the contact r due to the operation of the relay R. The information sending circuit 38 then sends out the calling party information set therein, which is sent to the called party terminal IB through the contacts ir, ir, and the LA line. This state is the third
Shown in the left half of Figure (A). The called party terminal 1B decodes the incoming multi-frequency signal and visually or audibly displays the calling party information.

When the sending of the calling party information is finished, the common processing control circuit 10
drives the relay IR of the line circuit 14 at a predetermined cycle for a predetermined period (FIG. 3(B)). This operates contact ir, draws the signal line 42 into the call signal device CR, and sends a call signal to the LA line. The bell circuit of the called party's terminal 1B then rings and calls the called party. This state is shown in the right half of FIG.

Instead of doing this, as shown in FIGS. 3(G) and (B), the relay IR which is sending out the calling signal from the calling signal device OR is restored to the silent state, and the information sending circuit 38 is attached during this time. Alternatively, the calling party information may be transmitted over the LA line.

In any case, in this embodiment, when a call arrives at the called party's terminal 16, the calling party information is sent from the information sending circuit 38 of the line circuit 14 during a period when there is no calling signal. In this embodiment, for example, a ring trunk 20 is connected to the calling terminal 1B via the communication path 12 (path 24, FIG. 2).
, a ringtone will now be sent.

The called party at the called party terminal 16 can know the calling party number displayed on the terminal device 16 when answering the incoming call. When a call is desired, a normal off-hook operation is performed. This causes line circuit 14 of called terminal 16 to
Then, the call current supply detection circuit 30 detects the ring trip due to this off-hook, and notifies the common processing control circuit 10 of this through the control line 34. Common processing control circuit 1
0 restores the connection path 24 between the calling terminal 1B and the ring trunk 20, and restores the connection path 24 between the calling terminal 1B and the called terminal 16.
A call path 28 is set between the two.

When the called party rejects the call, for example, the handset of the terminal 18 is momentarily off-hook, as shown in FIG. 4(A).
- An instantaneous ring trip signal as shown in subscriber line 18
Send to. In the line circuit 14 of the called terminal 16, the instantaneous ring trip caused by this instantaneous off-hook is detected by the communication current supply detection circuit 30, and the common processing control circuit 10 is notified of this through the control line 34. As a result, the control circuit IO determines that the called subscriber has rejected the call, controls the communication path 12, and connects the busy tone trunk 22 to the calling subscriber terminal 16 in this embodiment. The calling subscriber then knows that he cannot reach the called subscriber and abandons the call.

Furthermore, as shown in Figure 4 (B), when a call is rejected, the subscriber loop is closed for a short time in a state where the loop resistance is higher than usual, and a half-ring trip signal with a lower radio wave level than usual is sent out. When the terminal device is housed in the line circuit 14, the communication current supply detection circuit 30 may be provided with a half-ring trip signal detection function. As a result, the line circuit 14 notifies the common processing control circuit 10 of the detection of the half-ring trip signal, and the control circuit 10 can perform the connection rejection processing described above.

The embodiments described here are for illustrating the present invention, and the invention is not necessarily limited thereto, and modifications and variations that can be made by those skilled in the art without departing from the spirit of the present invention. Modifications are within the scope of this invention. For example, the information sending circuit 38 may send out not only the calling party information but also any other information to be sent to the called party, and the sending method is not limited to the multi-frequency signal as in the same embodiment. , may take the form of other analog signals. Of course, this method is not limited to telephone exchanges that accommodate analog lines;
For example, it can also be advantageously applied to automatic exchanges which transmit information directly in the form of digital signals to terminals.

(Effects of the Invention) As described above, according to the present invention, the called subscriber can obtain caller information before answering the incoming call, and can refuse the call connection as desired. Therefore, there is no inconvenience such as charges to the subscriber even though the call is rejected, and the called party can respond after knowing who the caller is, providing more convenient subscriber service. provided.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an example of the configuration of a line circuit in the embodiment of the present invention shown in FIG. 2, and FIG. The relay system diagrams, FIGS. 3 and 4 are signal waveform diagrams for explaining the operation of the line circuit shown in FIG.
FIG. 3 shows a normal response to an incoming call, and FIG. 4 shows a case of a call rejection response to an incoming call. Explanation of symbols of main parts 10, Common processing control circuit 12, Call path network 14, Line circuit 22, Busy tone trunk 30, Call current supply detection circuit 3B, Information sending Circuit OR, Calling signal device IR, Calling signal device switching relay R90, Calling signal sending relay Patent applicant Oki Electric Industry Co., Ltd. Representative Takao Katori Maruyama

Claims (1)

[Scope of Claims] 1. In a caller information notification method of an automatic exchange that notifies a called party of information about the calling party, the method includes: When a call occurs, information about the calling party of the call is sent to the called party. characterized in that when the call arrives at the called party's terminal and a paging signal is sent to the terminal, the calling party information is sent to the called party's terminal during a period in which there is no paging signal. Caller information notification method for automatic exchanges. 2. The method according to claim 1, wherein the method detects a call rejection signal sent from the called party terminal after sending the calling party information. Information notification method. 3. The calling party information notification method according to claim 2, wherein the calling party information notification method is characterized in that when the call rejection signal is detected, a busy tone is sent to the calling party terminal.