JPH0795296A - Automatic private branch exchange - Google Patents

Abstract

PURPOSE:To provide an automatic private branch exchange with improved operability and economicity capable of performing redialing without releasing a DISA part for a fixed period of time even when an extension line communication state is attained at the time of call termination by additional number direct inward dialing connection. CONSTITUTION:This automatic private branch exchange 1' is provided with the DISA part 14 for automatically answering to a caller at the time of trunk line call termination, dialing an extension line by an additional number or the like by the caller and performing call termination connection or the like to the pertinent extension line 3 and a main controller part 21' provided with a timer monitoring part 22 for maintaining a state where the DISA part 14 is accessible from the caller for a preset fixed period of time after the call termination connection to the extension line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private automatic branch exchange, and in particular, when a call is received from a station line, it automatically responds to the caller by a voice response, etc., and the caller dials the extension by an additional number or the like to connect to the corresponding extension. The present invention relates to a private automatic branch exchange having a direct inward system access (hereinafter abbreviated as DISA) function.

[0002]

2. Description of the Related Art In recent years, there have been remarkable developments in private automatic branch exchanges, and even in the method of receiving incoming calls from a central line,
An operator handles all incoming calls, a dial-in system that allows specific extension telephones to receive calls depending on the central office line, a distributed termination system that allows multiple telephones to correspond to the central office line, and a station from a central office switch. A PBX dial-in system in which a number that was decided in advance at the time of the contract corresponding to the line number is sent to receive a call at a specific extension telephone, etc., when the call is received, the private automatic switch automatically responds by voice response, etc. There is an additional number dial-in system that uses the DISA function to dial an extension number or the like while listening to guidance or the like and receive the call at the corresponding extension telephone or the like.

A conventional private branch exchange will be described below. FIG. 3 is a block diagram showing the configuration of a conventional private automatic branch exchange. Reference numeral 1 is a conventional private branch exchange, 2 is a central office line connected from the private branch exchange 1 to a central office switch (not shown),
Reference numeral 3 is an extension connected from the private branch exchange 1 to an extension telephone or the like (not shown). Reference numeral 4 is a call path switch unit for controlling a call path between the extensions 3 and between the extension 3 and the office line 2. Bell detector for detecting a bell signal at the time, 6 is an end-of-talk detecting section for detecting an end-of-call signal (direct current interruption signal) on the station line 2, and 7 is a station-line 2
A call path control section for transmitting voices from the call path to the call path switch section 4, 8 a dial sending section for sending a dial signal to the office line 2 at the time of calling, 9 a bell detecting section 5, an end-of-call detecting section 6, a call path A station line interface unit comprising a control unit 7 and a dial transmission unit 8 for accommodating a station line 2, 10 is a message transmission unit for transmitting a dial-in guidance message or the like to the station line 2 when an incoming call is received, and 11 is a communication line 2 through the station line 2. Dial receiving unit that receives a DTMF (PB; push button) signal that is an additional number (extension number, etc.) from the caller, 12 is an intermittent tone,
An end-of-call tone detection unit that detects an end of call by continuous sound or silence, 13 is a call path control unit that determines a signal from the office line 2 and controls the call path setting, and 14 is a message sending unit 1
0, a dial receiving unit 11, an end-of-call tone detecting unit 12, a call path control unit 13, etc. for realizing an additional number dial-in connection by the DISA function, and 15 is an extension telephone (not shown) connected to the extension 3. ) A hook detection unit for detecting off-hook or on-hook from 16), a dial reception unit 16 for detecting a dial signal sent from an extension telephone (not shown), and 17 a bell signal to extension 3 when an extension is received. A bell sending unit for sending a call, a call path control unit 18 for setting a call path between the extension 3 and the office line 2 via the call path switch unit 4, and 19 a bell sending unit 17, a call path control An extension interface unit for accommodating the extension 3 which is composed of the unit 18, the dial receiving unit 16 and the hook detecting unit 15;
Reference numeral 20 is a main storage unit that stores the ID number of the extension 3 and management data for control, and 21 is a main control unit that controls exchange processing of the private automatic branch exchange 1.

The operation of the additional number dial-in system of the private automatic branch exchange constructed as described above will be described below. FIG. 4 is a state transition diagram of a conventional additional number dial-in system of a private branch exchange. Normally, when there is no incoming call on the office line 2, the main control unit 21 waits in an unused state of the office line to wait for an incoming call from the caller (S1). now,
When an incoming call is received on the station line 2, the main control unit 21 detects a bell signal via the bell detector 5 of the station line interface 9,
It is checked whether the DISA unit 14 is empty (S2).
If the DISA unit 14 is empty, the system waits for the DISA unit 14 to become free, and transitions to S3 if the DISA unit 14 becomes available, and transitions to the station line unused state S1 when the disappearance of the bell is detected (S
7). If the DISA unit 14 has a free space, the message sending unit 10 is instructed to send a dial-in guidance message (S3). When the caller goes on-hook or the like while sending the dial-in guidance message, the call termination signal is detected through the call termination tone detection unit 12, and the state transitions to the station line unused state (S1). Next, when the transmission of the dial-in guidance message is completed, the process proceeds to the reception of the extension number and the like from the caller (S4). When the end call is detected while receiving the extension number, a transition to the station line unused (S1) is made, and a code indicating redialing, for example, "*" or "#"
Etc., the extension number or the like being received is canceled, and the process proceeds to the transmission of a dial-in guidance message (S3). DTM such as extension number from sender
When the F signal is correctly received by the dial receiving unit 11 and the extension number or the like can be determined, the corresponding extension is called via the bell sending unit 17 of the extension interface unit 19 (S5). When the end call is detected during the extension call, the extension call is stopped and the DISA unit 14 is released to transit to the station unused state (S1), and a redial code such as "*" or "#" When it is received, the extension call is stopped and the process proceeds to the sending of the dial-in guidance message (S3) so that the extension number and the like can be received again. Next, the extension call is normally made and the corresponding extension telephone, etc. (not shown)
Is responded, the main controller unit 21 detects it by the hook detector 15 of the extension interface unit 19, and the DISA unit 1
4 is released and the call path switch unit 4 is controlled to transit to the extension call (S6) via the call path control units 18 and 7. When the call between the extension 3 and the office line 2 is completed, the end-of-speech detection unit 6 of the office line interface unit 9 detects the end-of-speech signal and transits to the unused state of the station line (S1), and the station line is again used. Wait for an incoming call from.

[0005]

However, in the above-mentioned conventional configuration, the DISA section is released once the extension telephone call state is reached, so that the extension of the called party is the answering machine or the FA.
In the case of X, answering machine, etc., if you want to cancel the connection and call back to another extension, especially if you need an emergency, you have to disconnect the line once and call back again, which is troublesome. There was a problem that the call charge would be extra.

The present invention solves the above-mentioned problems of the prior art, and has an operability and an economical efficiency that can be redialed without releasing the DISA section for a certain period of time even if an extension call state occurs when a call is received by an additional number dial-in connection. The purpose is to provide an excellent private automatic branch exchange.

[0007]

In order to achieve this object, the private automatic branch exchange of the present invention automatically responds to a caller when an incoming call is made to the station line, and the caller dials an extension by an additional number or the like. A private automatic branch exchange having a DISA section for making an incoming call connection and the like, and a main control having a timer monitoring section for maintaining a state in which a caller can access the DISA section for a preset period of time after an extension incoming connection is made. It is provided with a configuration having a device section.

Here, for the release control of the DISA unit, a predetermined time value is set in advance in the main memory unit in the private automatic branch exchange, and when the extension is connected, the timer monitoring unit monitors the time based on this set value. The timer monitoring unit notifies the main control unit that the set time has elapsed and the main control unit D
It is configured to release the ISA part. Further, it is convenient that the set time can be arbitrarily changed in consideration of the number of station lines accommodated, the type of exchange service, and the like.

[0009]

With this configuration, when an incoming call is received by the additional number dial-in connection, even if the extension call state is established, the DISA is kept for a certain period of time.
Since the copy is not released, the caller can make a redial by using a specific dial.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a private automatic branch exchange according to an embodiment of the present invention. Reference numeral 2 is a station line, 3 is an extension line, 4 is a speech path switch section, 5 is a bell detection section, 6 is an end call detection section, 7 is a speech path control section, 8 is a dial sending section, 9 is a station line interface section, and 10 is a station line interface section. Is a message sending unit, 11 is a dial receiving unit, 12 is an end tone detecting unit, 13 is a communication path control unit, 14 is a DISA unit, 15 is a hook detecting unit, 16 is a dial receiving unit, 17 is a bell sending unit, 18 Is a communication path control unit, 19 is an extension interface unit, and 20 is a main storage unit. Since these are the same as those in the conventional example, the same reference numerals are given and description thereof is omitted. Reference numeral 1'denotes a private automatic branch exchange of the present invention, and 21 'includes a timer monitoring unit 22 for maintaining a state in which the DISA unit can be accessed for a certain period of time until the timer monitoring unit 22 times out after receiving an extension in addition to the conventional function. It is a main controller unit that has.

The operation of the additional number dial-in system of the private automatic branch exchange 1'having the above-mentioned structure will be described below. FIG. 2 is a state transition diagram of the additional number dial-in system of the private branch exchange 1'in one embodiment of the present invention. Normally, when there is no incoming call from the station line 2, the station line is unused and waiting for an incoming call from the caller (S8). When an incoming call arrives at the station line 2 in this state, the main controller 21 'detects a bell signal via the bell detector 5 of the station line interface 9 to check whether the DISA section 14 is empty (S9). If there is no free space in the DISA unit 14, wait for the DISA unit 14 to become free (S15), and then D
When the ISA unit 14 becomes empty, the process proceeds to S10, and the DISA unit 1
When the disappearance of the bell is detected while waiting for 4 to become vacant, a transition is made to the station line unused state (S8). If the DISA unit 14 is available, the message sending unit 10 is instructed to send the dial-in guidance message to the caller (S10). When the caller disconnects the line due to on-hook or the like during the transmission of the dial-in guidance message, the call-end tone detecting unit 12 detects the call-ending signal, and the line is not used (S8). Next, when the transmission of the dial-in guidance message is completed, the process proceeds to the reception of numbers such as extension numbers from the caller (S11). When the end call is detected while receiving the extension number from the caller (S11), it transits to the unused state of the station line (S8) and receives a code indicating redial, for example, "*" or "#". In this case, the extension number being received is canceled, the message transits to S10 so that the extension number can be received again, and the dial-in guidance message is sent again.
When the extension number from the caller is correctly received, the extension 3 is called via the bell sending unit 17 of the extension interface unit 19 (S12). When the end call is detected during the extension call, the extension call is stopped, the DISA unit 14 is released to transit to the station unused state (S8), and when the redial code is received, the extension call is stopped. The process proceeds to S10 so that the extension number can be received again, and the dial-in guidance message is sent from the message sending unit 10. When the extension call is normally made and the corresponding extension telephone (not shown) answers, the main control unit 2
1'detects this via the hook detection unit 15 of the extension interface unit 19, instructs the timer monitoring unit 22 to monitor the timer for a fixed time set in advance in the main storage unit 20, and until the time-out occurs. DISA section 14 between
Is not released (S13). Therefore, if a redial code is received during this period, A is disconnected during extension call and extension 3
Then, the process proceeds to the transmission of the dial-in guidance message (S10) so that the redial can be performed again. Further, when the call end signal is detected, the DISA unit 14 is released, and the station line is not used (S8). Next, main controller unit 21 '
When the timeout is detected after the elapse of a certain time instructed by the timer monitoring unit 22, the state transitions to B (S14) during extension call, the DISA unit 14 is released, and the call path switch unit 4 and the call path control units 18 and 7 are released. A call path is set between the extension line 3 and the office line 2 via the line, and when the call end is detected, the state transitions to the station line unused state (S8), and the incoming call from the station line 2 is waited again.

As described above, according to the present embodiment, in the additional number dial-in connection, the DISA unit 14 is not released for a certain period of time even after the extension response, so that the extension 3 of the destination is reached.
Even if the answering machine, fax, answering machine, or other automatic answering machine is called, the caller redials within a certain period of time, so that the extension 3 can be called again without disconnecting the line. This is especially convenient when you need an emergency.

[0013]

As described above, according to the present invention, since the main controller unit is provided with the timer monitoring unit, the extension line is not disconnected within a fixed time even if the extension call state is established in the additional dial-in connection. You can access the DISA section as before connecting, so you can save the call charge and D
Operability that can support advanced service functions of ISA,
It is possible to realize an automatic private branch exchange with excellent convenience and economy.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a private automatic branch exchange according to an embodiment of the present invention.

FIG. 2 is a state transition diagram of an additional number dial-in system of a private automatic branch exchange according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional private automatic branch exchange.

FIG. 4 is a state transition diagram of an additional number dial-in system of a conventional private branch exchange.

[Explanation of symbols]

 1,1 'Private branch exchange 2 Station line 3 Extension 4 Call path switch section 5 Bell detection section 6 End call detection section 7, 13, 18 Call path control section 8 Dial sending section 9 Station line interface section 10 Message sending section 11, 16 dial receiving section 12 end-call tone detecting section 14 DISA section 15 hook detecting section 17 bell sending section 19 extension interface section 20 main storage section 21, 21 'main control section 22 timer monitoring section

Claims (1)

[Claims] 1. A direct inward system access (DISA) in which a caller automatically responds to an incoming call to a station line and the caller dials an extension by an additional number to make an incoming call connection to the corresponding extension. A private branch exchange equipped with a section, and a timer monitoring for maintaining a state in which the caller can access the direct inward system access (DISA) section for a preset time after the extension incoming call connection. An automatic private branch exchange having a main control unit having a unit.