JPH05316554A - Main wire dialing system by digital compatible private branch exchange - Google Patents

Abstract

PURPOSE:To reduce the time required for the end of dialing to an analog main wire. CONSTITUTION:The system consists of an analog telephone set 2 able to designate a subaddress, a channel switch 1 changes over the communication among a digital main wire 3, an analog main wire 4 and the analog telephone set 2, a storage device 6 storing a dial number inputted from the analog telephone set 2, and a controller 5 controlling the dialing of a dial number to the analog main wire 4 till the input of the subaddress is received.

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 an office line of a digital line network and an office line of an analog public telephone line network.

[0002]

2. Description of the Related Art In recent years, for example, ISDN (Integrated Services Digital Network) is being prepared as a digital line network, and IS for making a call using this ISDN.
The terminal device for DN has been gradually put into practical use.

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

In an ISDN-supported private branch exchange capable of accommodating the ISDN office line and the analog office line,
Due to its economic efficiency, there is a limit to the number of lines that can be accommodated by both parties.
When the service provided by SDN must be used, it is desirable to use both so as to call to the ISDN station line and to call to the analog station line in other cases.

In general, the use of the ISDN-supported private branch exchange for the transmission of the office line is as follows. There is a special number "0" for calling to the analog station line and a special number "9" for calling to the ISDN station line.

2. Depending on the type of telephone, a method is to call from the digital telephone to the ISDN office line and from the analog telephone to the analog office line.

3. A method of calling to the analog station line when only the dialing special number and the partner contractor line number are dialed from the analog telephone, and to the ISDN office line when the separator code and sub address are dialed after the partner contractor line number. Etc.

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

By utilizing the sub-address notification used for designating the extension number of the digital private branch exchange or the terminal designation at the time of multipoint connection, the sub-address is designated after the partner contractor line number when dialing the ISDN office line.

FIG. 5 shows an example of a station line originating dial number which specifies a sub address from an analog telephone of a digital compatible private branch exchange, and an example of a station line originating dial number which does not specify a sub address from an analog telephone of a digital compatible private branch exchange. explain.

When an ISDN office line originating dial with a subaddress is used using an analog telephone which can specify a delimiter code that can be distinguished from a numeral by using the '*', '#' buttons or function buttons, etc. Outgoing special number '0', partner subscriber's line number, delimiter code ('
* 'Button), sub address number, end code ('#'
A button, which can be omitted, is dialed (FIG. 5 (a)).

When an analog telephone call is made from an analog telephone without specifying a subaddress, the special telephone line call number "0" and the partner subscriber's line number are dialed (FIG. 5 (b)).

[0013] In a digital private branch exchange that uses the latter method to provide office line transmission with a subaddress designated from an analog telephone, whether or not the subaddress is designated is determined by the presence or absence of a delimiter code (usually, the delimiter code is used). For the presence or absence of the code, dial the other party's line number,
Judgment is based on the time interval between dialed digits). In ISDN, a so-called batch calling procedure is generally used in which a call setup message is not accepted unless the caller's subscriber's line number and subaddress number of the called terminal are included in the call setup message. There is.

Therefore, the ISD to which the delimiter code is input
To make a call to the N station line, as shown in FIG. 6 (b), ISDN is used after all digits of the partner subscriber's line number and subaddress have been accumulated.
The call setup message is formed after the station line is added and the delimiter code is input.

On the other hand, when making a call to an analog station line to which a delimiter code is not input, as shown in FIG. 6A, the analog station line is dialed when the other party's subscriber line number is dialed and the delimiter code times out. It will be supplemented and then performed. In this transmission, it is impossible to catch the station line because it is impossible to distinguish between the transmission to the ISDN station line and the transmission to the analog station line until the delimiter code is input.

Since it is not necessary to select a station line when making a call to an analog station line in a private branch exchange (analog exchange) that does not support ISDN, a special number for the station line call was dialed for the purpose of shortening the transmission time. At the time, the station line is supplemented, and thereafter, each time the other party's subscriber's line number is entered, that number is transmitted to the station line.

[0017]

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

The present invention has been made in view of the above problems, and it is an object of the present invention to shorten the time required to complete the transmission from an analog telephone to an analog office line in an ISDN-compatible private branch exchange.

[0019]

According to the present invention, an analog telephone whose subaddress can be designated, a communication line switch for switching between a digital station line and communication between the analog station line and the analog telephone, and an input from the analog telephone. A private branch exchange for digital communications, comprising: a storage device for storing the dial number to be stored, and a control device for controlling the dial number to be transmitted to the analog office line until the subaddress is input. Is.

[0020]

According to the present invention, the dialed number is transmitted to the analog central office line until the sub address is input, so that the same time as the transmission to the analog central office line in the private branch exchange which does not support digital is performed. You can complete the call with.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An 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. Reference numeral 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 device, and 6 is a storage device.

The analog telephone 2 can select the ISDN office line 3 and the analog office line 4 depending on whether or not a subaddress is designated. In the present embodiment, for simplification of description, only the analog telephone 2 is accommodated in the ISDN private branch exchange. However, an appropriate number of analog telephones and digital telephones are accommodated according to the capacity of the exchange. It goes without saying that you can do it.

The ISDN station line 3 is a station line for using services provided by ISDN.

The analog station line 4 is a station line for using 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 structure of the reception number storage area provided in the storage device 6. As shown in the figure, the numbers dialed from the analog telephone 2 are sequentially stored digit by digit.

According to the dial number stored in the reception number storage area of the storage device 6, the control device 5 first determines whether the first line is a local line transmission special number (usually "0") or not. When it is determined whether or not to make a call, the dial number is sent in order from the second digit, that is, the first digit of the partner subscriber's line number when calling to the analog station line. Further, the control device 5 is an IS
When the call setup message is transmitted to the DN office line, the second and subsequent numbers are similarly stored in the storage device 6 to form the call setup message.

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

When the analog telephone 2 originates a call (state 1) and the control line calling special number "0" is dialed in the control device 5, the control device 5 stores this dial number in the reception number storage area of the storage device 6. At the same time, it is determined that the station line is transmitted, and the analog station line and the ISDN station line are captured (state 2). The ISDN station line may be captured after the time when the analog station line is captured.

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 uses the line of the analog station line to transmit the partner subscriber line number to the analog station line. At the same time as notifying that the loop will be closed and the station will be called, a timer (for example,
4 seconds) and if there is another dial input within 4 seconds after this, the storage device 6
The dial number stored in is sent to the analog office line (state 3).

The control device 5 will continue to dial the analog telephone 2 until a predetermined number of digits are dialed.
Send the dialed number to the analog office line after a second.

When the control device 5 receives the delimiter code after the dial number, it judges that the dialed number dialed after this delimiter code is the designation of the sub address, and abandons the analog station line during number transmission and releases it. At the same time, the dial number is stored in the reception 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 transmitted to the ISDN central office line (state 5).
After this state 5, the normal ISDN message transmission / reception sequence is followed.

If the delimiter code after the dial number is not received until the time is over, the control device 5 judges that the dial reception is completed, releases the ISDN station line, and continues the connection with the analog station line ( State 6). From this state 6 onward, the calling party of the other party is called via the analog station line. Note that if the ISDN office line has not been captured, it is not necessary to be involved in the ISDN office line.

The timing of 4 seconds is taken in FIGS. 4A and 4B. This is the time 3 required for the station to receive a signal normally after the loop of the analog station line is closed.
This is for securing the seconds, and allows the analog station line to be abandoned halfway before finishing sending all digits of the dial number to the station line, and it also has a selection signal corresponding to the final dial number. This is so that the delimiter code can be judged before sending.

[0039]

According to the present invention, since the dialed number is transmitted to the analog station line until the sub address is input, the operator of the analog telephone can use the analog station without wasteful waiting time. It is possible to send a signal to the line. When making a call to the ISDN central office line, the same procedure and time as in the past can be used.

[Brief description of 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 an embodiment of the present invention.

FIG. 4 is a timing diagram of an embodiment of the present invention.

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

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

[Explanation of symbols]

 1 communication path switch 2 analog telephone 3 ISDN office line 4 analog office line 5 controller 6 storage device

Claims (1)

[Claims] 1. An analog telephone whose subaddress can be designated, a communication line switch for switching between a digital station line and communication between the analog station line and the analog telephone, and a memory for storing a dial number input from the analog telephone. Until you enter the device and the above subaddress,
A digital-supported private branch exchange comprising: a control device for controlling the dial number to be transmitted to the analog office line.