JPH01109894A - Central office line transmitting connection control system - Google Patents

Abstract

PURPOSE:To mutually listen to the transmitting signal of a remote side immediately by an extension caller and a called central office line when the central office line responds by constantly connecting an extension to the central office line after a PB signal is transmitted in a private branch exchange for storing the central office line for transmitting a selected numeric character by the PB signal. CONSTITUTION:When the extension 2 automatically transmits to the central office line 3, a central controller(CC) 16 sets speech paths p1 and p2 in a network 13 (state ST3). In the state ST3, when the caller transmits the selected numeric character in a dial pulse form from a telephone set 21, an extension circuit 11 transfers it to the central controller 16 through the network 13. The central controller 16 releases the speech path p2, sets a speech path p3 for connecting a PB signal generating circuit 14 to the central office line 3 and thereafter, activates a numeric character transmitting timer for counting a period for transmitting the one digit of the selected numeric character to the central office line 3. (state ST2) In the state ST2, the numeric character transmitting timer completes to count numeric character transmitting period, and then, the speech path p3 is released to set the p2. Namely, the central controller 16 transmits the respective digits of the selected numeric character to the central office line 3, thereafter, immediately shifts to the state ST3.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a private branch exchange with a common control system, and in particular to a central office line origination connection control system in a private branch exchange that accommodates a central office line that transmits each digit of a selected number by a push button dial signal. Even if a response signal cannot be received from the central line and the number of digits in the selection digits sent to the central office line is less than the number of valid digits, the extension calling party and the central office line called party can each receive the other party's transmitted signal. In a private branch exchange using a common control system that accommodates a central office line that sends a selection signal by a push-button dial signal, the push-button dial signal is transmitted to the network that accommodates the extension line and the central office line. Contains a button dial signal generation circuit, and connects the push button dial signal generation circuit to the central office line at the time when each digit of the selected number starts to be sent to the central office line when making an automatic call from the extension to the central office line. Set in the network, when each digit of the selected number is sent to the central office line, the communication path connecting the push button dial signal generation circuit and the central office line is released, and the communication path connecting the extension line and the central office line is released. The configuration is such that a communication path control means is provided to set the communication path within the network.

[Industrial application field]

The present invention relates to a private branch exchange using a common control system, and more particularly to a central office line origination connection control system in a private branch exchange that accommodates a central office line that transmits each digit of a selected number by a push button dial signal.

In a private branch exchange that accommodates a push-button dial signal type central office line, it receives the dial pulse format sent from the extension that automatically calls the central office line, or the selected digits in the push-button dial signal format, and then retransmits the push-button dial signal format. Measures have been taken to send the information to the central office line. (Hereinafter, the back button dial signal will be referred to as the PB double signal.) If a means for transmitting this type of PB double signal is provided for each office line,
For example, in common control type private branch exchanges such as electronic private branch exchanges,
Attempts have been made to provide a circuit that generates a PB double signal in common to each office line, and to connect it to the office line that transmits the selected number.

[Conventional technology]

FIG. 4 is a diagram showing an example of a conventional private branch exchange of this type, and FIG. 5 is a diagram showing an example of the selected digit sending process in FIG. 4.

In FIG. 4, extension 2 is accommodated in network (NW) 13 via extension circuit (LC) 11, and PB
A digital private branch exchange 1 is shown in which a central office line 3 for transmitting each digit of a selected number from a double signal is accommodated in a network 13 via a central office circuit (COT) 12.

Furthermore, the network 13 includes a PB signal generation circuit (PBS
) 14 and a silence generation circuit (NT) 15 that generates a silence signal indicating a silence state.

The central controller (CC) 16 also controls the setting and release of each communication path p1 to p4 within the network 13.

In FIGS. 4 and 5, when extension 2 makes an automatic call to central office line 3, central controller 16
(Status 5T in Figure 5)
I).

In this state STI, the silence signal generated by the silence generation circuit 15 is sent to the office line 3 via the communication path p4 and the office line circuit 12, and the tone and other signals arriving from the office line 3 are transmitted to the office line 3. It is sent to extension 2 via line circuit 12, communication path pl, and extension circuit 11.

In the state gs'rt, the caller enters a selected digit (e.g. "2") from the telephone 621, e.g. in the form of a dial pulse.
, the extension circuit 11 receives the selection digit '2'' and transmits it to the central control unit 16 via the network 13.

The central control device 16 determines that no response signal has been returned from the central office line 3 (step S1) and that the inter-digit timer has reached a predetermined value H1.
The timing period has not been completed (step S2), and the number to be sent to the central office line 3 has been received (step S3).
), release the communication path p4 set in the network 13, and open the PB signal generation circuit (PBS) 1.
After setting the communication path p3 that connects the accommodation position where the PB multiplied signal corresponding to the selected number "2" from 4 to the selected number "2" is generated to the office line 3 (step S4), a period for transmitting one digit of the selected number to the office line 3 (step S4) is set. For example, a numeric sending timer that counts 100 milliseconds is activated (step S5).

As a result of the above, the state cQST1 transitions to the state 6s'r2 where the PB double signal corresponding to the selected digit °2' generated by the PB signal generation circuit 14 is sent to the central office line 3 via the communication path p3 and the central office line circuit 12. do.

In this state ST2, when the numeric sending timer completes the timing of the numeric sending period (step S6), the central control unit 16 confirms that all the significant digits of the selected digits to be sent to the central office line have not been sent yet. (Step S7), the communication path p3 set in the network 13 is released, the communication path p4 connecting the silence generation circuit 15 and the office line circuit 12 is set (step S8), and the above-mentioned interdigit The timer is started (step S9), and the state changes to STI.

Similarly, each time the central controller 16 receives each digit of the selection number sent from the telephone 21, the central controller 16 transitions between the state STI and the state gsT2, and selects the PB signal format for the central office line 3. Send numbers.

In step S7, if the central control unit 16 determines that all the effective digits have been transmitted, it releases the communication path p3 set within the network 13 and connects the extension circuit 11 and central office line circuit 12. In step 510), the communication path p2 to connect the communication path p2 is set, and the state transitions to state ST3.

In addition, if the number of digits of the selected digits sent from the telephone set 21 is less than the number of effective digits, in the state STI when the last digit of the selected digits has been sent, the telephone 21 indicates that a response signal has been returned from the central office line 3. If detected via the line circuit 12 (step S1), the central control unit 16 releases the communication path p4 set within the network 13 and establishes a communication path connecting the extension circuit 11 and the central office line circuit 12. p2 is set (step 510), and the state transitions to state ST3.

However, the response signal from central office line 3 is not necessarily sent to private branch exchange a1.
For example, in a so-called slave private branch exchange where the 10 branch line circuits 12 of a private branch exchange are connected to the extension circuits of other private branch exchanges, even if the called party answers, the call will not be answered. It is assumed that the signal is not returned.

In such a case, if the number of digits of the selected digits sent from the telephone 21 is less than the number of effective digits, the inter-digit timer starts the predetermined inter-digit period in the STI state after sending the last digit of the selected digits. When the timing has been completed (step S2), and the digits to be sent to the central office line 3 have not been received (step S3), the central control unit (CC) 16 sets the digit reception timer to the selected digits sent from the extension 2. After finishing timing the period (for example, several seconds) that is allowed for the reception of
ll), the communication path p set within the network 13
4 and set the communication path p2 that connects the extension circuit 11 and the office line circuit 12 (step knob 510), state ST3.
Transition to.

In such a case, even if the called party responds promptly, the numeric reception timer indicates that i! Until the time period allowed for the reception of tR digits has not been counted, a transition from state STI to state ST3 is not possible, and even if the called party's voice is heard by the caller at extension 2, the caller at extension 2 cannot The outgoing call is not sent to station 'a3, and is not communicated to the called party.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in conventional private branch exchanges, when the central office line circuit 12 cannot receive a response signal and the number of digits of the selected number sent from the telephone 21 is less than the number of effective digits, The problem is that even if the called party answers before the digit reception timer completes the digit reception period, the calling party cannot be heard. there were.

The present invention enables the extension calling party and the called party to communicate with each other even when a response signal cannot be received from the central office line and the number of digits of the selected digits sent to the central office line is less than the number of valid digits. The purpose is to make it possible to listen to the signal sent by the other party.

[Means for solving problems]

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

In FIG. 1, l is a private branch exchange with a common control system, 2 is an extension, 3 is a central office line that sends selected numbers by push button dialing signals, 13 is a network that accommodates extension 2 and central office line 3, and 100 is a push button. This is a push button dial signal generation circuit that generates a dial signal.

Reference numeral 200 represents a communication path control means provided according to the present invention.

[Effect]

The push button dial signal generation circuit 100 is housed in the network 13.

When the call route control means 200 automatically makes a call from the extension 2 to the central office line 3, at the time when each digit of the selected number starts to be sent to the central office line 3,
A communication path connecting the push-button dial signal generation circuit 100 and the office line 3 is set up in the network 13, and when each digit of the selected number is finished being sent to the office line 3, the push-button dial signal generation circuit 100 and the office line are connected. 'ft! The communication path connecting wA3 is released, and the communication path connecting inner wA2 and office line 3 is set within the network 13.

Therefore, after sending the push button dialing signal, the extension and the central office line 3 are always connected, and when the central office line answers, the extension calling party and the central office line called party immediately communicate with each other. The signal can be heard.

〔Example〕

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

FIG. 2 is a diagram showing a private branch exchange according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of the selected digit sending process in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, the PB signal generation circuit (PBS) 14 is replaced by the push button dial signal generation circuit 100 in FIG.
A central control unit (CC) 16 which is housed in the network (NW) 13 as shown in FIG. is provided as the communication path control means 200 in FIG.

In FIGS. 2 and 3, when extension 2 makes an automatic call to central office line 3, central controller 16
(Third diagram gsT
3).

In this state ST3, various signals sent from the telephone 21 are sent to the office line 3 via the extension line 2, the extension circuit (LC) 11, the communication path p2 and the office line circuit (COT) 12, and the office line The dial tone and other signals arriving from 3 are sent to extension 2 via central office line circuit 12, communication path p1, and extension circuit 11.

In case 1sT3, when the caller sends a selection digit (for example, "2") from the telephone 21, for example in the form of a dial pulse, the extension circuit 11 receives the selection digit "2" and sends it to the central controller 16 via the network 13. to communicate.

After confirming that the inter-digit timer has completed timing the predetermined inter-digit period (step 521) and that the digits to be sent to the central office line 3 have been received (step 522), the central control device 16 The storage position of extension 2 for network 13 is evacuated to the area corresponding to central office line 3 in extension storage position storage 171 (step 523), the communication path p2 set in network 13 is released, and the PB signal is After setting the communication path p3 that connects the accommodation position where the generating circuit 14 generates the PB signal corresponding to the selected number "2" to the office line 3 (step 524), one digit of the selected number is sent to the office line 3. A numeric sending timer is started that counts a period of time (eg, 100 milliseconds) (step 525).

As a result of the above, a transition is made to state ST2 in which the PB signal corresponding to the selected number '2' generated by the PB signal generating circuit 14 is sent to the central office line 3 via the communication path p3 and the central office line circuit 12.

In this state ST2, when the numeric sending timer completes the timing of the numeric sending period (step 526), the central controller 16 stores the extension 2 which had been evacuated to the area corresponding to the central office line 3 in the extension storage position storage section 171. The position is restored (step 527), the communication path p3 set in the network 13 is released, the communication path p2 connecting the extension circuit 11 and the central office line circuit 12 is set (step S8), and the above-mentioned inter-digit Step S9) to start the timer, state ST+
Transition to −.

Thereafter, in the same manner, the selected digits Φ are sent from the telephone 21.
As each digit is received, the central controller 16
While making a transition between and state aST3, a selected number in the PB signal format is sent to the central office line 3.

In addition, if the selected digits to be sent have not been received,
The central controller 16 maintains state ST3, and various signals sent from the telephone 21 are sent to the office line 3 via the extension 2, extension circuit 11, communication path p2, and office line circuit (C0T) 12, and Various signals arriving from the office line 3 are sent to the extension 2 via the office line circuit 12, communication path p1 and extension circuit 11.
This allows both parties to hear the signals sent by the other party.

Therefore, even if the called party answers but no response signal is returned, for example when the central office line circuit 12 of the private branch exchange 1 is connected to the extension circuit of another private branch exchange, the central office line circuit 12 of the private branch exchange 1 may The signal sent from the caller can be transmitted to the telephone 21 via the office line 3, the office line circuit 12, the communication path p1, the extension circuit 11, and the internal vA2 immediately after sending the selected digit, and the signal sent from the extension caller becomes able to listen to the signal sent by the called party on the central office line.

Of course, the signal sent by the extension caller is also transmitted to the office line called party via the telephone 21, the extension line 2, the extension circuit 11, the communication path p2, the office line circuit 12, and the office line 3.

As is clear from the above explanation (according to this embodiment, after the central control unit 16 sends each digit of the selected number to the central office line 3, it immediately transitions to the state ST3, so that the extension caller Both the called party and the called party can receive the signals sent by the other party.

It should be noted that FIGS. 2 and 3 are only one embodiment of the present invention, and for example, the central control unit 16 is limited to evacuating or restoring the accommodation position of the extension 2 using the extension accommodation position storage section 171. There are many other variations that can be considered, such as using call setting information provided in the main storage device 17 when a call is made from extension 2 to central office line 3, but in any case, the main The effect of the invention remains the same. It goes without saying that the private branch exchange 1 to which the present invention is applied is not limited to that shown in the drawings.

〔Effect of the invention〕

As described above, according to the present invention, in the private branch exchange, after the push button dial (No. This allows both the called party and the called party to listen to each other's transmission signals.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a private branch exchange according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of the selected digit sending process in FIG. 2, and FIG. 5 is a diagram showing an example of a conventional private branch exchange, and FIG. 5 is a diagram showing an example of the selected digit sending process in FIG. 4. In the figure, 1 is a private branch exchange, 2 is an extension line, 3 is a central office line, 1
1 is the extension circuit (LC), 12 is the office line circuit (COT),
13 is a network (NW), 14 is a PB signal generation circuit (PBS), 15 is a silence generation circuit (NT), 16
is the central controller (CG), 17 is the main memory (MM)
, 21 is a telephone, 100 is a push-button dialing signal generation circuit, 171 is an extension accommodation storage unit, and 200 is a communication path control means. Yoki-Kaya 4 Mouth 40

Claims (1)

[Scope of Claims] A private branch exchange (1) of a common control system that accommodates a central office line (3) that transmits selected digits by push-button dialing signals, which accommodates an extension line (2) and the central office line (3). A push-button dial signal generation circuit (100) for generating a push-button dial signal is housed in the network (13), and when an automatic call is made from the extension (2) to the central office line (3), At the time when each digit of the selected number is to be transmitted, a communication path connecting the push button dial signal generation circuit (100) and the office line (3) is set in the network (13), (3) When each digit of the selected number is finished being transmitted, the communication path connecting the push-button dialing signal generating circuit (100) and the office line (3) is released, and the telephone line connecting the extension line (2) is opened. A central office line origination connection control system, characterized in that a telephone call path control means (200) is provided for setting a telephone call path within the network (13) to connect the central office line (3).