JP2902854B2 - Digital Private Branch Exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital private branch exchange capable of accommodating office lines of a digital network and office lines of an analog public telephone network.

[0002]

2. Description of the Related Art In recent years, for example, ISDN (Integrated Services Digital Network) has been developed as a digital network, and an ISDN for making a call using this ISDN has been developed.
Terminal devices for DN have also been gradually put into practical use.

[0003] This ISDN will replace the analog public telephone network (PSTN) in the future, but both the ISDN and the PSTN will be used until the replacement is completely completed. Therefore, in this period, a private branch exchange which is capable of accommodating both the ISDN office line and the PSTN office line (hereinafter referred to as an analog office line) is desired.

[0004] In an ISDN-compatible private branch exchange which can accommodate the ISDN office line and the analog office line,
Due to its economical efficiency, the number of lines accommodated is limited.
When it is necessary to use the service provided by the SDN, it is desirable to selectively use both so that the call is transmitted to the ISDN office line, and in other cases, the call is sent to the analog office line.

[0005] In general, a private branch exchange which is compatible with ISDN uses both of them when transmitting an office line. A method to have a special number such as special number '0' for analog station line and '9' for ISDN station line.

[0006] 2. According to the type of telephone, a method of transmitting a signal from a digital telephone to an ISDN office line and a method from an analog telephone to an analog office line.

[0007] 3. A method of making a call to an analog office line when only a calling special number and a partner line number are dialed from an analog telephone, and an ISDN office line when a separator code and a subaddress are dialed after the partner line number. Etc.

The present invention relates to the above item 3, and this method will be described in detail below.

Using a subaddress notification used for designation of an extension number of a digital private branch exchange, designation of a terminal at the time of multipoint connection, etc., when dialing into an ISDN office line, a subaddress is designated after the line number of the other party.

Referring to FIG. 5, an example of a local line dial number specifying a subaddress from an analog telephone of a digital private branch exchange and an example of a central line dial number not specifying a subaddress from an analog telephone of a digital private branch exchange will be described. explain.

When using an analog telephone capable of designating a delimiter code that can be distinguished from a numeral by using the '*', '#' buttons or function buttons, etc., and performing ISDN central office line dialing with a subaddress specified, Outgoing special number '0', other party's line number, delimiter code ('
* 'Button), sub address number, end code ('#'
A button (although it may be omitted) is dialed (FIG. 5A).

[0012] Further, when an analog telephone line is dialed without specifying a sub-address from the analog telephone, the telephone line transmission special number '0' and the other party's line number are dialed (Fig. 5 (b) ) .

In a digital private branch exchange which provides a local line transmission with a sub-address designated by an analog telephone using the latter method, whether or not a sub-address is designated is determined by the presence or absence of a delimiter code (usually a delimiter). After dialing the other party's line number,
Judgment is made based on the time interval between digits of the dialed number). ISDN generally uses a so-called batch calling procedure in which a call setup message is not accepted unless the call setup message includes all digits of the destination subscriber's line number and subaddress in the called terminal. I have.

Therefore, the ISD to which the delimiter code is input
As shown in FIG. 6 (b), a call to the N office line is stored in the ISDN after storing all digits of the other party's line number and subaddress.
This is accomplished by capturing the office line and forming a call setup message after the delimiter code has been entered.

On the other hand, as shown in FIG. 6 (a), when an outgoing call is made to an analog office line to which no delimiter code is input, the analog office line is dialed when the other party's line number is dialed in and the time for the delimiter code is over. It is supplemented and then performed. In this transmission, until the delimiter code is input, it is not possible to distinguish between transmission to the ISDN office line and transmission to the analog office line, so that the office line cannot be captured.

In the case of a private branch exchange (analog exchange) that does not support ISDN, a local line transmission special number is dialed for the purpose of shortening the transmission time because there is no need to select a local line. At that time, the office line is supplemented, and thereafter, each time the destination subscriber line number is input by one digit, that number is transmitted to the office line.

[0017]

As described above, the time required to complete a call from an analog telephone housed in a digital-capable private branch exchange to an analog office line is completed by the analog telephone housed in the analog exchange. There is a problem that it is extremely long compared to that of.

The present invention has been made in view of the above problems, and has as its object to reduce the time required for an ISDN-compatible private branch exchange to complete a call from an analog telephone to an analog office line.

[0019]

SUMMARY OF THE INVENTION The present invention relates to an analog telephone.
In the private branch exchange accommodating the telephone, the analog telephone
Switching between communication with a digital or analog station line
Channel switch and input from the analog telephone
Storage device for storing the dialed number information,
Based on the dial number information stored in the device, the analog
Call to the local office line and add the sub-address
When information is included, the call to the analog line
Abandon the sub-address information stored in the storage device
Send dial number information including the above digital office line
And a control device for controlling the
It is.

[0020]

According to the present invention, the dial number is transmitted to the analog office line until the sub-address is input. Therefore, the same time as the transmission to the analog office line in the private branch exchange which does not support digital is used. Can complete the call.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram of an ISDN (digital) private branch exchange. 1 is a communication path switch, 2 is an analog telephone, 3 is an ISDN office line (digital office line), 4 is an analog office line, 5 is a control unit, and 6 is a storage unit.

The analog telephone 2 can select the ISDN office line 3 or the analog office line 4 depending on whether or not a subaddress is designated. In this embodiment, for the sake of simplicity, a case is shown in which only the analog telephone 2 is accommodated in the ISDN private branch exchange, but an appropriate number of analog telephones and digital telephones are accommodated in accordance with the accommodation capacity of the exchange. It goes without saying that you can do it.

The ISDN office line 3 is an office line for utilizing services provided by ISDN.

The analog office line 4 is an office line for utilizing a public telephone line network.

The communication path switch 1 switches communication between the ISDN office line 3 or the analog office line 4 and the analog telephone 2.

The storage device 6 stores dial numbers and the like input from the analog telephone 2.

The control device 5 controls the communication path switch 1 and the storage device 6.

FIG. 2 shows an example of the configuration of the reception number storage area provided in the storage device 6, and as shown in FIG. 2, numbers dialed from the analog telephone 2 are sequentially stored digit by digit.

In accordance with the dial number stored in the reception number storage area of the storage device 6, the control device 5 determines whether the first digit is a local line transmission special number (usually '0'). If it is determined whether the call is to be transmitted to the analog office line, the dial number is transmitted in order from the second digit, that is, the first digit of the other party's line number. Further, the control device 5
When transmitting a call setup message to the DN office line, the second and subsequent numbers are similarly stored in the storage device 6 to form a call setup message.

FIG. 3 is a state transition diagram of one embodiment of the present invention. The upper left numeral of each state is a state number used for explanation. Here, DT indicates a dial tone, CDT indicates a second dial tone, ICOT indicates an ISDN office line, and ACOT indicates an analog office line. FIG. 4A is a timing chart of receiving a dial number from the analog telephone 2 and transmitting the call to the analog office line, and FIG. 4B is a timing chart of transmitting a call setting message to the ISDN office line. is there. The numbers on the left side of the figure are the numbers dialed by the analog telephone in order from the top, and the numbers on the right are the signals and I
Fig. 7 shows a call setup message sent to an SDN office line.

When the analog telephone 2 makes a call (state 1) and dials the local line transmission special number "0", the control device 5 stores the dial number in the reception number storage area of the storage device 6. At the same time, it is determined that the signal is originating from an office line, and an analog office line and an ISDN office line are captured (state 2). Note that the capture of the ISDN office line may be performed after the time of capturing the analog office line.

The control device 5 sequentially stores the dial numbers dialed from the analog telephone 2 in the reception number storage area of the storage device 6 and transmits the analog subscriber line to the analog telephone line to transmit the other party's line number. At the same time that the loop is closed and the station is notified, the timer (for example,
4 seconds), and if the next dial input is made within 4 seconds thereafter, the storage device 6 will be started 4 seconds after the timer starts.
Is transmitted to the analog office line (state 3).

The control device 5, hereinafter to a predetermined number of digits are dialed, and transmits the dialed number to an analog station line 4 seconds after dialed from the analog telephone 2.

When the control device 5 receives the delimiter code after the dial number, it determines that the dial number dialed after this delimiter code is designated as a subaddress, and abandons and releases the analog office line transmitting the number. And the dialed number is stored in the received number storage area (state 4).

The control device 5 forms a call setup message based on the number stored in the reception number storage area,
This message is sent to the ISDN office line (state 5).
From this state 5 onward, a normal ISDN message transmission / reception sequence is followed.

If the control unit 5 does not receive the delimiter code after the dial number until the time expires, the control unit 5 determines that the dial reception has ended, releases the ISDN office line, and continues the connection with the analog office line ( State 6). From the state 6 onward, the other party's call is made via the analog office line. If the ISDN office line has not been captured, there is no need to be involved in the ISDN office line.

4 (a) and 4 (b), the timing of 4 seconds is taken. This is the time required for the station to normally receive a signal after closing the loop of the analog office line.
The selection signal corresponding to the last dialed number is provided so as to secure the seconds and to allow the analog office line to abandon the entire number of digits of the dialed number before completing the transmission to the office line. It is possible to determine the delimiter code before sending.

[0039]

According to the present invention, the dial number is transmitted to the analog office line until the subaddress is input, so that the operator of the analog telephone can use the analog office without any unnecessary waiting time. It is possible to send a signal to the line. It should be noted that when transmitting to the ISDN office line, the same procedure and time as in the related art can be used.

[Brief description of the drawings]

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

FIG. 2 is a configuration example of a reception number storage area according to an embodiment of the present invention.

FIG. 3 is a state transition diagram of one embodiment of the present invention.

FIG. 4 is a timing chart of one embodiment of the present invention.

FIG. 5 is an example of a dial number according to an embodiment of the present invention.

FIG. 6 is an example of a conventional dial number.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Communication path switch 2 Analog telephone 3 ISDN office line 4 Analog office line 5 Control device 6 Storage device

Claims (1)

(57) [Claims] 1. A private branch exchange accommodating an analog telephone.
In the above, the analog telephone and digital office line or analog office line
A communication path switch for switching communication between the analog telephone and a storage device for storing dial number information input from the analog telephone; and a storage device for storing dial number information stored in the storage device.
Make a call to the analog office line, and
When dress information is included, send to the above analog office line
In the middle, and the sub-address stored in the storage device
Send dial number information including information to the above digital office line.
And characterized by comprising a control device for controlling to Shin
Digital compatible private branch exchange.