JPH0322789A - Telephone system - Google Patents

Abstract

PURPOSE:To prevent the generation of a malfunction by inhibiting a holding operation based on the detection of a DTMF signal detecting circuit, in the case a telephone set connected to line wire is a telephone set controlled by a control signal consisting of a DTMF signal, for instance, an automatic answering telephone set. CONSTITUTION:In accordance with a telephone set brought to off-hook in response to a call of an extension telephone set, whether a flag stored in a RAM 18 is '1' or not is decided. In this case, when an automatic answering telephone set 17, that is, a flag '1' is concerned, the detection of a signal supplied from a DTMF signal detecting circuit 16 is inhibited, and thereafter, a speech processing is executed. Accordingly, it does not occur that a holding operation is executed by a remote control signal (formed from a DTMF signal) from a trunk line, and also, a remote control of the automatic answering telephone set 17 is also attained surely. In such a way, a malfunction can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a telephone device, and more particularly to a telephone device capable of connecting a plurality of telephones to a single office line.

(b) Prior Art A conventional telephone device of this type will be explained with reference to FIG.

In the figure, (1) is a telephone line connection terminal, which is connected to a central office line via this connection terminal (1).

(2) is a rectifier circuit, (3a) and (3b) are external line/internal line switching relays, and the output terminals of the rectifying circuit (2) are connected to the external line side individual contacts (PI) and (P3) of the switching relay, respectively. .

In addition, the extension side individual contacts (P2) of relays (3a) (3b)
) (P4) is connected to the call matrix circuit (6), and the common contact (ql) of the relays (3a) (3b)
) (Q2) is connected to detection circuits (4a) (4b) for detecting off-hook and pulse dial signals. The detection circuits (4a) and (4b) are configured to include a 7-year-old toggler, and when off-hook and pulse dial signals are detected, the detection circuits (4a) and (4b) are sent to the calculation control means (5) via lines (11) and (12). Derive the signal. Note that the arithmetic control means (5) is realized by a microcomputer or the like.

In addition, the detection circuits (4a) (4b) are connected to the extension telephones (7a) (7b) via the extension telephone connection terminals (6a) (6b).
) are connected to each other.

Said call matrix circuit (6) is connected to a dial tone generating circuit (8). The call matrix circuit (6) also includes individual contacts on the extension side of the relay (3a) (
P2) with the dial tone transmission circuit (8), and a cross point (10) that connects the extension side individual contact (P4> of the relay (3b) with the dial tone transmission circuit (8). , the extension side individual contact (P2) of the relay (3a) and the extension side individual contact (P2) of the relay (3b>
4) and a cross point (o) (12) that connects the two. These cross points (9) (10) (
11) (12) and other call matrix circuits (6)
) is controlled by an arithmetic control means. Further, the calculation control means (5) also controls switching of the relays (3a) and (3b). (
13) is a ringer detection circuit connected between the telephone line connection terminal (1) and the rectifier circuit (2), which supplies a detection signal to the arithmetic control means (5) when a ringer is detected. . (14) is a hold circuit that emits a hold tone, and is a hold relay (15) controlled by the arithmetic control means (5).
) to the output terminal of the rectifier circuit (2). (16) is the common contact (ql) of relays (3a) (3b)
) (q2).

Next, its operation will be briefly explained.

Of these, one machine (7a) (7b) is in a hooked state, and the relays (3a) (3b) are operated by the calculation control means (
5) is connected to the extension side individual contacts (P2) (P4), and when the inner telephone (7a) goes off-hook in such a state, the off-hook state is detected by the detection circuit (4a). , the detection signal is input to the calculation control means (5) via the line (t1).

In response to the detection signal, the arithmetic control means (5) turns on the cross point (9) of the call matrix circuit (6), and transmits the dial tone from the dial tone transmission circuit (8) to the extension telephone m ( 7a).

After that, the dial signal from the extension telephone (7a) is monitored, and "0" indicating an outside call request is placed at the beginning of the dial signal.
is detected, the relay (3a) is connected to the outside contact (PI).
and connect the extension telephone (7a) to the central office line.

On the other hand, when the extension telephone number is sent from the extension telephone (7a), it is detected by the detection circuit (4a) and inputted to the arithmetic control means (5). This allows the calculation control means (
5) makes an extension call using the extension telephone (7b). and,
When the extension telephone loss (7b) goes off-hook, the detection circuit (4
b) detects this and inputs it to the arithmetic control means (5).The arithmetic control means (5) thereby turns on the cross points (11) and (12) of the call matrix circuit (6) and performs an extension call. .

Further, when there is an incoming call from the central office line, the incoming call is detected by the ringer detection circuit (13) and a detection signal is supplied to the arithmetic control means (5). In response to the detection signal, the arithmetic control means (5) first supplies a ringer sound to the extension telephone, and when the extension telephone is off-hook, stops supplying the ringer sound, and the detection circuit <4a) (4b) Detect which extension went off-hook. Next, the relay on the off-hook extension telephone side is switched to the contact on the outside line side, making it possible to make an outside line call. Furthermore, when the hold button is operated,
The hold relay (l5) is closed and the hold tone is sent to the central office line.

(C) Problems to be Solved by the Invention According to the above-mentioned conventional technology, it is possible to reliably accomplish calls between telephones, calls between telephones and a central office line, and calls on a central office line.

However, when an answering machine whose operation is controlled by a remote control signal consisting of a DTMF signal is connected as an extension telephone, for example, the remote control signal closes the hold relay and undesirably sends hold tone to the central office line. I have a habit of getting irritated and causing malfunctions when I put it away.

Additionally, if the telephones connected via the central office line are of the same type, a DTM F signal for placing one telephone system on hold is supplied to the other telephone system via the central office line. However, there is a problem in that the other telephone device is placed on hold.

(2) Means for Solving the Problems In view of the above points, the present invention enables a plurality of telephones to be connected to a single central office line, and also connects the external line side connection that connects the telephone to the central office line and the telephone. external line/extension line switching means for switching to one of the connection states of the extension side connection connected to the external line/extension line side connection;
a holding means, a DTMF signal detection means for detecting a DTMF signal, a means for storing information about a connected telephone, and information about a telephone connected to an outside line controlled by a control signal consisting of a DTMF signal. When this is the case, the apparatus is characterized by comprising a control means for prohibiting the operation of the suspension means based on the detection by the DTMF signal detection means.

In addition, it is possible to connect a plurality of telephones to a single central office line, and to switch between an external line connection that connects the telephone to the central office line and an extension side connection that connects the telephones to each other. Extension switching means, holding means, and DTM
DTMF signal detection means for detecting the F signal;
D T indicating a hold command when connecting the external line side of the extension switching means
control means for switching the outside line/extension line switching means to the one-extension side connection state in response to the detection of the MF signal, and detecting the presence or absence of the DTMF signal;
The present invention is characterized in that the holding means is driven in response to the presence of the DTMF signal when the extension line is connected after the MF signal is detected.

Furthermore, a plurality of telephones can be connected to a single central office line, and the external line can be switched to either an external line connection that connects the telephone to the central office line or an extension side connection that connects the telephones to each other. /extension switching means, hold means, DT
DTMF signal detection means for detecting an MF signal, means for storing information regarding a connected telephone, and when an outside line is connected;
When the information in the storage means is information regarding the first telephone to be Mlipped by a control signal consisting of a DTMF signal, the operation of the suspension means based on the detection by the DTMF signal detection means is prohibited, and the information in the storage means is is information regarding the second telephone, DT indicating a hold command
Control means for switching the outside line/extension line switching means to an extension side connection state in response to detection of an MF signal, detecting the presence or absence of a DTMF signal, and driving the holding means in response to the presence of the DTMF signal. It is characterized by

(E) Function According to the present invention, the telephone connected to an outside line can use DTMF
Telephones controlled by control signals consisting of signals (e.g.
In the case of a telephone answering machine), the operation of the holding means based on the detection by the DTMF signal detecting means is prohibited.

Furthermore, when a normal telephone is connected to an outside line, in response to the detection of a DTMF signal indicating a hold command, the outside line/extension line switching means is first switched to the extension side connection state, and then the presence or absence of a DTMF signal is detected. do.

Then, if the DTMF signal is present, the holding means is driven.

(F) Embodiment FIG. 1 is a diagram showing a telephone device according to the present invention, and the same parts as in FIG.

In Figure 1, (17) is inside! II An answering machine connected to the telephone connection terminal (6b), (18) an RA serving as a storage means for storing information regarding the connected telephone.
M, (19) is a key manual section having a numeric keypad and function keys, (20a) and (20b) are detection circuits (4a
) (4b) and the extension telephone connection terminals (6a) and (6b), and is controlled by the arithmetic control means (5). The relays (20a) (20b) have a first contact (
P5) (P7) are respectively connected to the output terminals of the detection circuits (4a) (4b), the second contacts (P6) (P8) are respectively connected to the chirping sound generation circuits (21) (22), and the common contact (Q3) (Q4)
are connected to extension telephone connection terminals (6a) and (6b), respectively. (23) (24) are relays (20a) (20
In the off-hook detection circuit connected between the common contacts (q3) (q4) of b) and the technical connection terminals (6a) (6b) for extension telephones, when off-hook is detected, the detection signal is sent to the calculation control means (
5).

The RAM (18
) To write information to ), first press the registration/'call switch (
25) and set the arithmetic control means (5) to the registration mode, and then the extension to which the telephone Ia (in this case, an answering machine) controlled by a control signal consisting of a DTMF signal is connected as an extension telephone. Enter the number. Thereafter, when a key not used for inputting an extension number, etc., such as a flash key for interrupt service, is operated in the registration mode, the arithmetic control means (5) responds to this by operating the RAM ( 18) The flag ``''l'' is stored in the area.

Next, the operation will be explained with reference to the flowcharts shown in FIGS. 2(A) and 2(B).

It is now assumed that the registration/call switch (25) is opened and the calculation control means (5) is set to the call mode.

In such a state, when there is an incoming call from the central office line, the incoming call is detected by the ringer detection circuit (13), and the ringer detection circuit (13) supplies a detection signal to the arithmetic I1 control means (5). The control means (5) outputs a control signal (St) (S2) in response to the detection signal, and controls the relays (20a) (20
b) is switched from the first contact side to the second contact side, outputs a control signal, sets the ringing sound generating circuits (21) and (22) to the active state, and calls the extension telephone.

When the answering machine (17) is set to the off-hook state in response to such a call, the off-hook state is detected by the off-hook detection circuit (24), and the off-hook detection circuit (24) ). The arithmetic control means (5) determines the off-hook extension telephone based on the detection signal. Also, relay (20
a) Supply a control signal (!T) (!T) to (20b) to switch from the second back point side to the first contact side, and also supply a control signal to the relay (3b) to switch the extension side separate contact (P
4) to the outside line side individual contact (P3), and connect the central office line and answering machine (17).

RAM is then loaded in response to the off-hook phone.
It is determined whether the flag stored in (1B) is "1" (step 4), but in this case, the answering machine (▲7
) [that is, the flag l''], then after prohibiting the detection of the signal supplied from the DTMF signal detection circuit (l6), the call processing is performed (steps 5 and 6). A hold operation is not performed using a remote control signal (formed by a DTMF signal), and remote control of the answering machine (I7) is also reliably achieved.

During such a call operation, it is determined whether or not the call is on-hook (step 7). If the call is not on-hook, the process immediately returns to step 2 and the above procedure is repeated; if the call is on-hook, the on-hook process is performed in step 8. After switching the relay (3b) to the extension side individual contact (P4),
In step 9, detection of the signal supplied from the DTMF signal detection circuit (l6>) is restarted, and the process returns to step 2.

On the other hand, when the extension telephone (7a) is off-hook in response to an incoming external call, the off-hook state is detected by the off-hook detection circuit (23), and the off-hook detection circuit (23) is detected by the arithmetic control means (5). The arithmetic control means (5) determines the off-hook extension telephone based on the detection signal.
) is supplied with a control signal (1T) (IT) to switch from the second contact side to the first contact side, and a control signal is supplied to the relay (3a) to switch from the internal line side individual contact (P2) to the external line side individual contact (
P1) to connect the office line and extension telephone (7a).

RAM is then loaded in response to the off-hook phone.
It is determined whether or not the flag stored in (18) is "1" (step 4), but in this case, since the flag is "O", the process immediately proceeds to step 10 to perform call processing.

During such a call operation, a DTMF signal indicating a hold command is detected (step 11), and if the DTMF signal is not detected, it is then determined whether or not the call is on-hook (step 18), and if the call is not on-hook, Immediately return to step 2 and repeat the above procedure, and if it is on-hook, go to step 19 and go on-hook 9l!
: After switching the relay (3a) to the extension side individual contact (P2), return to step 2.

By the way, when a DTMF signal indicating a hold command is detected in step 11, the calculation control means (5) first activates the relay (
3a) and supply the control signal to the external line side 3q contact (P1).
Then, the hold relay (15) is closed and the hold tone from the hold circuit (14) is sent to the central office line (step 12).

In such a state, the arithmetic control means (5) detects a signal from the DTMF signal detection circuit (16), and when the DTMF signal indicating the hold command is detected, the extension telephone (7a)
It is determined that the status is on hold, and the hold flag "l" is set to continue the hold state (steps 13 and 14). This holding operation continues until a release command is issued, and when the release command is issued, the calculation control means (5) first operates the relay (3a).
A control signal is supplied to the inner A side individual contact (P2) to the outer S
Switch to side individual contact (P1), then hold relay (15
> is opened (steps 15, 16).

On the other hand, if no DTMF signal is detected in step l3, the relay (3a) is immediately switched to the extension side individual support point (P2).
) to the outside line side individual contact (PI), and then the hold relay (15) is opened (step 17).

Next, if there is no incoming call from an outside line, call the extension phone (7a).
When the hook goes off-hook, the arithmetic control means (5) determines the off-hook state based on the detection signal from the hook detection circuit (step 20).

Next, the arithmetic control means (5) determines whether a telephone number has been input from the off-hook extension telephone (7a), and if there is a "0" at the beginning of the telephone number, it determines that it is an outside line call (step 21). When making such an outside call, it is determined whether or not the other party has responded (step 25), and if the other party has responded, step lO
If there is no response, it is determined whether or not it is on-hook (step 26), and if it is not on-hook, it returns to step 2. If it is on-hook, on-hook processing is executed in step 30, and then step 2 Return to

On the other hand, if there is no "0" at the beginning of the telephone number, it is determined that the call is an extension call, and if the other party answers, an extension call process is executed (steps 22 to 24). If an extension call is in progress or there is no response to an extension call, it is determined whether or not it is on-hook (step 29), and if it is not on-hook, the process goes to step 2, and if it is on-hook, it goes to step 30, where on-hook processing is performed. After executing, return to step 2.

If no telephone number is entered, the dial tone transmission circuit (8) sends a dial tone to the off-hook extension telephone and waits for the telephone number to be entered (
Steps 21, 22, 27, 28).

In the above embodiment, the RAM (18) is used as the storage means, but the switch provided corresponding to each extension telephone may be closed or the arithmetic control means (
Information may be stored by, for example, grounding the terminal of 5) via a diode.

(G) Effects of the Invention According to the present invention described in claim 1, it is possible to reliably control a telephone set (for example, an answering machine In) that is controlled by a control signal consisting of a DTMF signal, and to control the It is possible to prevent a malfunction in which a suspension operation is performed based on a signal.

According to the present invention as set forth in claim 2, even if the other party uses the same type of telephone device, it is possible to prevent malfunctions such as a hold operation being performed in response to a hold command from the other party. It is possible to reliably respond to a hold command.

According to the present invention as set forth in claim 3, the holding means does not malfunction due to the control signal and the holding command from the other party, which is practical.

[Brief Description of the Drawings] Figure 1 shows an embodiment of the present invention, Figures 2 (A) and (B)
) is a flowchart showing the operation of the main part thereof, and FIG. 3 is a diagram showing a conventional example. (2) - Rectifier circuit, (3a) (3b) - Relay, (
4a) (4b)...Detection circuit, (5)...Calculation control means, (6)...Telephone matrix circuit, (8)...
・Dial tone transmission circuit, (l3)...Register detection circuit, (14)...Holding circuit, (15)...Holding relay, (17)...Answering machine, (18)...・
RAM, (19)...Key human resources department.

Claims (3)

[Claims] (1) Multiple telephones can be connected to a single central office line, and the external line can be switched to either an external line connection that connects the telephone to the central office line or an extension side connection that connects the telephones to each other. /Extension switching means, hold means, DTM
DTMF signal detection means for detecting the F signal; means for storing information about the connected telephone; and when the information about the telephone connected to the outside line is information about a telephone controlled by a control signal consisting of a DTMF signal; Said D
A telephone device comprising: control means for inhibiting operation of the holding means based on detection by the TMF signal detection means. (2) Multiple telephones can be connected to a single central office line, and the external line can be switched to either an external line connection that connects the telephone to the central office line or an extension side connection that connects the telephones to each other. /Extension switching means, hold means, DTM
When the DTMF signal detection means for detecting a signal and the outside line/extension line switching means are connected to the outside line side, the outside line/extension line switching means is switched to the extension side connected state in response to the detection of the DTMF signal indicating a hold command, and the DTMF signal and a control means for detecting the presence or absence of the DTMF signal, and the control means is configured to drive the holding means in response to the presence of the DTMF signal when the extension line is connected after the DTMF signal is detected. telephone equipment. (3) A plurality of telephones can be connected to a single central office line, and the connection state can be switched to either an external line connection that connects the telephone to the central office line or an extension side connection that connects the telephones to each other. External line/extension line switching means, hold means, and DT
DTMF signal detection means for detecting an MF signal; means for storing information regarding a connected telephone; and when connecting an outside line;
When the information in the storage means is information regarding a first telephone controlled by a control signal consisting of a DTMF signal, the operation of the holding means based on the detection by the DTMF signal detection means is prohibited, and the information in the storage means is is information regarding the second telephone, DTMF indicating a hold command.
The control means is further provided for switching the outside line/extension line switching means to an extension side connected state in response to the detection of a signal, detecting the presence or absence of a DTMF signal, and driving the holding means in response to the presence of the DTMF signal. Telephone device featuring features.