JPH034693A - Telephone system - Google Patents

Abstract

PURPOSE:To prevent the occurrence of malfunction by providing a means storing information on a telephone set to be connected and a control means controlling a holding function by means of a holding means based on information on the telephone set connected to a line wire. CONSTITUTION:When an automatic answering telephone set 17 is set in an off-hook state in response to a call, an off-hook detection circuit 24 detects the off-hook state concerned and the off-hook detection circuit 24 supplies a detection signal to an operation control means 5. It decides an extension telephone set which is off-hooked based on the detection signal. The operation control means 5 only decides whether a DTMF signal supplied from a trunk line agrees with a release code stored in RAM 18. Since the operation control means 5 decides only the input of the release code, a holding action is prevented in the remote control signal (formed by DTMF signal) from the trunk line and the remote control of the automatic answering telephone set 17 is surely realized.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Field of Application The present invention allows a plurality of telephones to be connected to a single central office line, and also connects the telephone to the central office line and an external line side connection that connects the telephone to the central office line. Switch to the connection state of either one of the extension side connections connected to the outside! The present invention relates to a telephone device comprising an I/extension switching means and a holding means, and having a function of holding a call on a local line, a function of talking between the telephones, and a function of talking between the telephone and the central 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 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/Z box circuit (6), and the common contact (q
l) (q2) Connected to detection circuits (4a) and (4b) for detecting off-hook and pulse dial signals.

The detection circuits (4a) and (4b) are configured to include photocouplers, and when off-hook and pulse dial signals are detected, they send a detection signal to the arithmetic control means (5) via a line (12). Note that the arithmetic control means (5) is realized by a microcomputer or the like.

Further, 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 transmitting circuit (8), and a cross point (10) connecting the extension side individual contact (P4) of the relay (3b) with the dial tone transmitting 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 cross points (11) and (12) for connecting 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. ing. (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.

When the internal AT telephones 7a) (7b) are in the on-hook state, the relays (3a) (3b) are connected to the extension side individual contacts (P2) (P4) by the calculation control means (5), and in such a state When the extension telephone (7a) goes off-hook,
The off-hook state is detected by the detection circuit (4a),
The detection signal is transmitted through the line (51) to the arithmetic control means (
5).

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

After that, the dial signal from the extension telephone (7a) is monitored, and an rQJ 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 (PL).
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 al (7a), it is detected by the detection circuit (4a) and input to the arithmetic control means (5). As a result, the calculation control means (5) causes the extension telephone (7b) to make an extension call. When the extension telephone (7b) goes off-hook, the detection circuit (4b) detects this and inputs it to the arithmetic control means (5). The arithmetic control means (5) thereby connects the cross points (II) (12) of the call matrix circuit (6).
Turn on and make an extension call. In addition, when there is an incoming call from the central office line, the incoming call is detected by the ringer detection circuit (1
3) and supplies the detection signal to the arithmetic control means (5). In response to the detection signal, the arithmetic control means (5) first supplies a ringer tone to the extension telephone, and when the extension telephone is off-hook, stops supplying the non-ringer tone and activates the detection circuit (4a).
At (4b), it is detected which extension telephone has gone 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 (15
) 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 achieve calls between telephones, calls between telephones and a central office line, and holding of telephone calls on a central office line.

However, if an answering machine whose operation is controlled by a remote control signal consisting of, for example, a DTM F signal is connected as an extension telephone, the hold relay is closed by the remote control signal and undesired hold tone is transmitted to the central office line. There was a habit of causing malfunctions such as being sent out.

(d) Means for Solving the Problems In view of the above points, the present invention allows a plurality of telephones to be connected to a single central office line, and also connects the telephone to an 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 telephone device having a function of holding a call on a central office line, a function of calling each other between the telephones, and a function of communicating between the telephone and the central office line, the telephone device comprising: a means for storing information regarding the telephone to be connected; and an outside line; The present invention is characterized by comprising a control means for controlling a holding function by the holding means based on information regarding a telephone connected to the telephone.

(E) Effect According to the present invention, when information regarding a telephone connected to an outside line indicates a telephone controlled by a control signal consisting of, for example, a DTMF signal, the control signal is The holding means operates and does not malfunction.

(f) Embodiment FIG. 1 is a diagram showing a telephone device according to the present invention, and the same parts as in FIG. 3 are given the same reference numerals and their explanation will be omitted.

In Figure 1, (17) is an extension telephone connection terminal (6
b) an answering machine connected to (18) a RAM serving as a storage means for storing information regarding the connected telephone;
(19) is a keypad with a numeric keypad and function keys, (20a) and (20b) are detection circuits (4a)
(4h) and inside! Connection terminal for 114 talk machine (6a) (6b)
The relay is connected between the two and is controlled by the arithmetic and control means (5). The relays (20a) (20b) have first contacts (P5) (P7) connected to the output terminals of the detection circuits (4a) (4b), respectively, and second contacts (P6) (P8) connected to the ringer sound generation circuit ( 21) In (22), common contacts (q3) (Q4
) are connected to extension telephone connection terminals (6a) and (6b), respectively. (23) (24) are relays (20a) (2
An off-hook detection circuit connected between the common contacts (q3) (q4) of 0b) and the extension telephone connection terminals (6a) (6b) supplies a detection signal to the calculation control means (5) when off-hook is detected. It is made to be.

In the present invention configured in this way, information is first written to the RAM (18) by pressing the registration/call switch (25).
and set the arithmetic control means (5) to registration mode,
Next, the extension number to which a telephone (in this case, an answering machine) controlled by a control signal consisting of a DTMF signal is connected as an extension telephone is input. 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 calculation i control means (5) responds to this by operating the R corresponding to the extension number. Store 7 lags '1'' in the area A M (18).

By the way, when the answering machine (17) has a call function, it is necessary to perform a hold function like a normal telephone when making a call. Therefore, in the present invention, a release code is input in order to release the control of the pending operation.

To register such a release code, after inputting the release code (for example, 2 digits) using the numeric keypad of the key manual section (19),
This is accomplished by entering the extension number. Also, similar to the above flag, the release code is the R corresponding to the extension number.
It is stored in the AM (18) area.

Next, the operation will be explained with reference to the flowchart shown in FIG.

Now the registration/call switch (25) is opened and the operation ti
It is assumed that the control means (5) is set to the call mode. In such a state, if there is an incoming call from the central office line, the incoming call is detected by the ringer detection circuit (13) and the ringer is activated.
The detection circuit (13) supplies a detection signal to the calculation control means (5).

The arithmetic control means (5) outputs a control signal (S+) (St) in response to the detection signal to activate the relays (20a) (20
b) is switched from the first contact side to the second contact side, and a control signal is output to set the ringer sound generating circuits (21) and (22) to the active state, and call the extension telephone.

When the answering machine (17) is set to an 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) sends a signal to the calculation control means (5). Provides detection signal.

The arithmetic control means (5) determines the off-hook extension telephone based on the detection signal. In addition, the relay (20a
) (20b) to switch from the second contact side to the first contact side by supplying the control signal (''7) (''7) to the relay (3b).
) to switch from the extension line side individual contact (P4) to the outside line side individual contact (P2), 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 (18) is 1'' (step 4), but in this case, the answering machine (17
) [that is, the flag is 1"], it is then determined whether a release code has been input (step 5). At this time, the calculation control means (5) uses the DT supplied from the central office line.
It is determined only whether the MF signal matches the release code stored in the RAM (18). If the release code has not been entered, the process immediately proceeds to step 9, where the call can be made. In addition, as mentioned above, the calculation control means (5
) only determines the input of the release code, so it does not perform a hold operation based on the remote control signal (formed from the DTMF signal) from the central office line, and the answering machine (17)
remote control is also reliably achieved. During such call operation,
It is determined whether on-hook has occurred (step 10);
If it is not on-hook, immediately return to step 2 and repeat the above steps; if it is on-hook,
After performing on-hook processing in step 11, that is, switching the relay (3b) to the extension side individual contact (P3), the process returns to step 2.

On the other hand, since the call function of the answering machine is used, if the release code is input, the arithmetic control means (5) allows input of all DTMF signals and determines whether there is a hold request (step 6). And if there is a hold request,
Proceed to step 7 and execute a hold operation. Such a hold operation is achieved by closing the hold relay (15) in response to a control signal from the arithmetic control means (5) and transmitting the hold tone from the hold circuit (14) to the central office line. This will continue until it is determined that the hold is released. Also, if it is determined in step 6 that there is no pending request, or step 8
When it is determined that the hold has been released, step 9
, and the telephone call operation is performed in the same manner as described above.

Next, when there is no incoming call from an outside line, when the extension telephone is off-hook, the arithmetic and control means (5) determines the off-hook state based on the detection signal from the off-hook detection circuit (step 12).

Next, the arithmetic control means (5) determines whether a telephone number is input from an off-hook extension telephone, for example, the extension telephone (7a), and if there is a "0" at the beginning of the telephone number, it determines that it is an outside call (step 13). ). When making such an outside line call, it is determined whether the other party has answered or not (Step 14); if the other party has responded, the process proceeds to Step 6; and if there is no response, it is determined whether or not the other party has been on-hook (Step 15); If not, the process returns to step 2; if it is on-hook, on-hook processing is executed in step 21, and then the process returns to step 2.

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, the extension call process is executed (step 13, ]6.19.20). If an extension call is in progress or there is no response to an extension call, it is determined whether or not on-hook has occurred (step 21); if on-hook has not occurred, the process proceeds to step 2; if on-hook has occurred, on-hook processing is performed in step 22). After execution, return to step 2.

If a telephone number is not input, the dialtone transmission circuit (8) sends a dial tone to the off-hook extension telephone and waits for the telephone number to be input (steps 13.16.17. 18).

In the above embodiment, the case where an answering machine is connected as an extension telephone is explained, but when a call is received, the password (
Needless to say, the present invention can also be applied to a case where a telephone of a type that requires input of a DTM F signal is connected.

(G) Effects of the Invention According to the present invention, information regarding an extension telephone is stored, and the hold function of the hold means is controlled based on the information regarding the telephone connected to the outside line. When connected as an extension phone, DTM
This prevents an erroneous operation in which a hold operation is executed by a remote control signal consisting of an F signal.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the main part thereof, and FIG. 3 is a diagram showing a conventional example. (2)... Rectifier circuit, (3a) (3b piece... relay,
(4a) (4b)...detection circuit, (5)...arithmetic control means, (6)...call matrix circuit, (8)...
・・Dial tone transmission circuit, (13) ・・Ringer
Detection circuit, (14)... Hold circuit, (15)... Hold relay, (17)... Answering machine, (18)...
・RAM, (19)...Key personnel department, (25)...
Registration, 7 call switch.

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. /Equipped with extension switching means and holding means,
A telephone device having a function of holding a call on a central office line, a function of calling between the telephones, and a function of communicating between the telephone and the central office line, the telephone having a means for storing information regarding a telephone to be connected, and a telephone connected to an outside line. A telephone device comprising: control means for controlling a holding function by the holding means based on information. (2) The control means is configured to detect only the presence or absence of input of a predetermined code when the information in the storage means is related to a telephone controlled by a control signal consisting of a DTMF signal. The telephone device according to claim 1. (3) The telephone device according to claim 2, wherein the control means is configured to enable the holding means to perform a holding function after a predetermined code is input.