JPS63196148A - Private branch exchange - Google Patents

Abstract

PURPOSE:To attain automatic connection even at the time of line wire call by repeating redialing to a line wire opposite party after a prescribed time by a redialing means if a calling line wire opposite party is busy, and calling an extension telephone set when the connection of the line to the line wire opposite party is detected. CONSTITUTION:When a line wire request signal is received from an extension control section 5, a line wire 4 and an extension telephone set are connected, a dial signal is sent and a dial number data corresponding to dial signal sent to a RAM is stored. If a line wire opposite party is busy, a 1-minute timer is started, and when the timer time is over, the dial signal of a dial number data stored in the RAM is sent to the line wire 4. Thus, until the busy state of the line wire destination is finished, redialing is applied for each 1-minute. When the busy state of the line wire destination is finished, the line is connected to the destination and a ring-back tone is detected, the extension telephone set called for the line wire is called by the extension control section 5 based on the extension number stored in the RAM.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a private branch exchange that can be connected to an outside line (general public line).

[Prior art]

Conventionally, as this type of device, a private branch exchange that performs circuit switching of an extension network has provided a wide variety of extension services. For example, this type of service includes automatic extension connection, in which when the other party who calls between extensions is busy, the private branch exchange connects the extension telephone that requested the call when the other party ends the call. When the call is made and the operator answers, the caller will call the end of the call.However, if the caller is an outside line, the automatic connection service described above cannot be performed because the private branch exchange cannot constantly monitor the end of the call. There is a problem.

[Means and effects for solving the problems] In the present invention,
If the external line destination that you called is busy, the re-calling means repeatedly calls the external line destination after a predetermined period of time, and when the line connection detection means detects that the line has been connected to the external line destination, the internal line is called again. By calling the telephone, automatic connection is possible even when making an outside call.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment.

In FIG. 1, 1 and 2 are extension telephones, and 3 is a private branch exchange.

4 is a general public line (external line) to which the private branch exchange 3 is connected.

The private branch exchange 3 is composed of an extension control section 5, an outside line control section 6, and a central control section 7.

The extension control section 5 normally controls the lines of the extension network, and outputs an outside line call request signal to the central control section 7 when a "0" is sent from the extension telephone.

The central control unit 7 includes a connection relay for connecting the extension line control unit 5 and the outside line control unit 6, a CPU for controlling the connection relay, the extension line control unit 5, and the outside line control unit 6, and a ROM storing a control program. RAM for storing information such as the telephone number of the other party on an outside line.

It also includes an extension control section 5, an outside line control section 6, and an interface section for transmitting and receiving various signals.

When the central control unit 7 receives the external line connection request signal from the extension control unit 5, it outputs a line capture command signal to the external line control unit 6, causes the external line control unit 6 to capture the line, and then turns on the above-mentioned connection relay. The control unit 5 and the outside line 4 are connected. In this state, the extension telephone and the outside line 4 are connected, and a call can be made from the extension telephone to the outside line. Then, the dial signal issued from the extension telephone is sent to the outside line 4, and the data of the sent dial number is stored in the RAM of the central control unit 7.

At this time, if the other party on the outside line is busy, the operator of the extension telephone specifies automatic connection mode using a key (not shown) provided on the telephone, and the number of the designated extension telephone is sent to the center from the extension control unit 5. When the central control unit 7 inputs the extension telephone number, it determines that it is in automatic connection mode, stores the extension number data in a predetermined area of the RAM, and controls automatic connection as described below.

FIG. 2 is a flowchart showing the control operation of the CPU of the central control unit 7 during automatic connection.

The following description will be made based on the flowchart shown in FIG.

First, in step S1, when an external line connection request signal is received from the extension control unit 5, the process proceeds to step S2, in which the external line 4 is connected to the extension telephone that requested the call by the above-mentioned operation, and the dial signal transmitted from the extension telephone is transmitted to the external line control unit. 6 to the outside line 4, and stores dial number data corresponding to the transmitted dial signal in the RAM.

Then, in step 83.37, it is determined whether the other party on the outside line is busy or ringing based on detection signals from the busy tone detection unit and ringback tone detection unit from the line 4 provided in the outside line control unit 6. If the outside line is busy, the process goes to step S4; if the other party is calling, the process goes to step S8.

If the outside line is busy and the process proceeds to step S4, a busy tone is sent to the extension telephone that made the call, and on condition that the automatic connection mode is specified, a one-minute timer is started in step S5, and step S6 When the one-minute timer times up, the process returns to step S2 and the dial signal of the dial number data stored in the RAM is sent to the outside line 4 by the outside line control unit 6.
send it to In this way, a re-call is made every minute until the other party's line is busy, but this one-minute timer is set to 1.
The calling interval is not limited to minutes and can be set arbitrarily by the operator.

When the outside line is no longer busy, the line is connected to the other party, and a ringback tone is detected in step S7, the process advances to step S8, where the extension telephone that made the outside call is set to the extension number stored in the RAM. Based on this, the extension control unit 5 makes a call.

Then, in step S9, it is determined whether the outside line has answered. If the outside line has answered, the process advances to step S14; if the outside line has not responded, the process advances to step 310, and the extension telephone that called in step S8 has answered. Decide whether or not.

If the extension telephone does not respond in step SIO, it is determined in step 311 whether a predetermined time T1 has elapsed since the ringback tone from the outside line 4 is detected, and if the predetermined time T1 has not elapsed, the process returns to step S9. When the predetermined time T1 has elapsed, the process proceeds to step S13, the outside line 4 is opened, and the automatic connection is reset.

In the loop of steps 89, 810, and 811 described above, if the other party on the outside line responds first, the process advances from step S9 to step S14, and in step S14, a voice message is sent to the other party on the outside line. This voice message is, for example, a message such as "This is OO. We are currently calling the extension you requested in automatic connection mode. Please wait." This is to let you know that you are being called. This voice message is stored as digital data in the RAM of the central control unit 7 using the PCM system, and the voice data in the RAM is reproduced into voice and sent to the outside line 4 via the outside line control unit 6. Step S1
When the voice message is sent in step 4, the process advances to step S15, in step 315 it is determined whether the extension telephone has answered, in step S16 it is determined whether the outside line has gone off-hook, and in step S17 it has been determined whether the outside line has answered or not. It is determined whether a predetermined time T2 has elapsed since then. In this judgment loop of steps S15°316 and S17, if it is determined that the extension telephone has answered before the predetermined time T2 has elapsed, the process proceeds from step S15 to step 811', and if it is determined that the external line has been turned off, step 81
6, the process advances to step S13, and if the extension telephone does not respond even after the predetermined time T2 has elapsed, the process proceeds from steps S17 to 81.
Proceed to step 3.

Meanwhile, steps 89, 810. If the extension telephone answers first in the Sll loop, the process moves from step SIO to step Sl.
1, the connection relay is turned on in step 811' to connect the extension telephone and the outside line 4, and the process waits for the extension telephone connected to the outside line to be turned off in step S12. When it is detected that the extension telephone is turned off, the process proceeds to step S13, where the outside line is opened and the automatic connection is reset, and the process ends.

As described above, according to the present embodiment, when a call is made from an internal line to an outside line and the other party on the outside line is busy, the central control unit 7 calls the other party on the outside line at predetermined intervals, for example, every one minute. Once the line is connected to the outside line destination, automatic connection is possible by calling the extension telephone that made the call.

Incidentally, in the embodiment described above, steps S15° and S16.
During the loop of S17, a holding tone melody may be sent to the other party on the outside line.

Further, the number of external lines connected to the private branch exchange is not limited to one line, but a plurality of lines can be connected, and the control is the same as in the embodiment described above.

〔effect〕

As explained above, according to the present invention, it is possible to automatically connect when a call is made from an extension line to an outside line, and it is possible to diversify the services of a private branch exchange.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of this embodiment, and FIG. 2 is a flowchart showing the operation of this embodiment. 1.2 is an extension telephone, 3 is a private branch exchange, 4 is an outside line, 5 is an extension control section, 6 is an outside line control section, and 7 is a central control section.萬11iJ 蜀2 fig.

Claims (1)

[Scope of Claims] Means for storing a calling number made from an extension to an outside line; means for detecting whether the other end of the outside line is busy; and when the detection means detects that the other party is busy, the number is stored in the storage means. It is characterized by having a re-calling means for calling the calling number of the outside line destination again after a predetermined time, and a means for calling the extension telephone that made the call to the outside line when it detects that the line has been connected to the outside line destination. private branch exchange.