JPH05219552A - Dial-in connection system - Google Patents

Abstract

PURPOSE:To allow an exchange station to automatically recognize the number of extension transmission digits to the PBX by providing a means receiving a receivable digit number (n) from the PBX and generating an extension number by means of the lower (n) digits of the public number on an incoming exchange station. CONSTITUTION:When recognizing the dial-in incoming from an incoming exchange station 2 to a PBX 3 by means of the primary response from the PBX 3, an incoming exchange station 2 inquires a means 6 inquiring extension number digits of whether or not the extension number digits to be sent to the PBX 3 are the lower digits. At the PBX 3, a means 7 returning extension digit number request response signal returns the receivable digit number (n) to an incoming exchange station 2. The incoming exchange station 2 recognizes the receivable digit number is (n) digits based on the PBX response signal, and the figures of the lower (n) digits are generated and sent from an extension number generation and transmission means 8 to the PBX 3. At the PBX 3, the extension subscriber of the corresponding extension number is called.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention assigns a public number to an extension subscriber of a PBX so that the PBX extension does not pass through a reception desk to the PB.
The present invention relates to a dial-in system for receiving a call to an X extension. Conventional PB
For connection to the X extension, it is normal to connect to the extension subscriber via the PBX reception desk by operating a switch, but recently, due to the dial-in system, the PBX extension does not go through the reception desk. The connection method for incoming calls has been adopted.

The dial-in system assigns a public number to each extension subscriber of the PBX so that the extension subscriber is directly subscribed to the telephone station, and the telephone station sends PB.
This is a method in which a plurality of trunk lines up to X are shared by many extension subscribers. In general, the dial-in system is not an additional number system, but an extension number is assigned to the lower digits of the subscriber number to identify the extension after the incoming call connection to the PBX.

[0003]

2. Description of the Related Art A schematic diagram of a conventional dial-in connection system is shown in FIG. In the figure, 21 is an originating exchange, 22 is an incoming exchange, 23 is a PBX, 24 is an originating subscriber, and 25 is an extension subscriber. Enter the dial-in number of extension subscriber 25 of PBX23 (0
44-777-1234) and the extension number to be identified in the subscriber number 1234 is the last three digits (234).

In this case, a maintenance person intervenes in advance at the incoming exchange 22 and the PBX 23 to set the extension identification number to be three digits. If an extension number that does not match the set 3-digit identification number is received, connection is disabled and dial-in is not performed. The extension identification number varies depending on the scale of the PBX, and may be the last 1 or 2 digits for a small capacity PBX and may be assigned 4 digits for a large capacity PBX.

FIG. 5 shows a connection sequence diagram of a conventional example.
The connection state of the PBX to the extension subscriber will be described with reference to FIGS. 4 and 5. In the figure, (1) 'A public number is assigned to the extension of PBX23, and the last n digits of the public number are set as an extension number. In the case of FIG. 4, it is 3 digits. (2) 'When the originating exchange 21 detects a subscriber call, it sends the public number 044-777-1234 of the originating subscriber 24 to the destination exchange 22 to dial. (3) 'The incoming call exchange 22 recognizes that the public number is accommodated in the PBX and notifies the PBX 23 of the incoming call. (4) When the PBX 23 recognizes the incoming notification, the incoming exchange 22
A primary response signal is sent to. (5) 'When the terminating exchange 22 recognizes the primary response from the PBX 23, it sends out the extension number (234) of 3 digits which is preset in the terminating exchange 22. (6) 'The PBX 23 calls the subscriber with the extension number (234) and sends a response notification (secondary response) to the terminating exchange 22 by the extension response. (7) 'The receiving exchange station 22 sends a response notice to the originating exchange station 21, and the originating subscriber 24 and the extension subscriber 25 of the PBX 23 transit to a busy state.

[0006]

In the above conventional method,
There are the following problems when the extension number is sent to the PBX. 'The called exchange station (public network) needs to set in advance the number of digits for extension transmission to the PBX by a maintenance person. In addition, in the PBX, it is necessary for the maintenance person to set in advance the number of digits received by the extension from the incoming exchange. If there is a setting mismatch between the number of digits sent by the exchange and the number of digits received by the PBX, the call connection cannot be established.
(Time-out or erroneous connection) In the dial-in connection method according to the present invention, when a dial-in call is received from the exchange (public network) to the corresponding PBX, the number of digits of the extension number to be sent to the PBX is automatically set in the exchange. The purpose is to recognize.

[0007]

FIG. 1 is a block diagram showing the principle of a dial-in connection system according to the present invention. In the figure, 1
Is an originating exchange station, 2 is an incoming exchange station, 3 is a PBX, 4 is an originating subscriber, and 5 is an extension subscriber. The incoming exchange 2 is equipped with means 6 for inquiring the number of digits of the extension number to be sent to the PBX 3 when the corresponding PBX 3 is dialed in.
The BX3 side is provided with means 7 for returning the number of receivable digits determined by the extension number plan as an answer to the inquiry from the incoming exchange station 2 and an extension digit number request response signal. It is provided with a means 8 for receiving the number n of receivable digits, and generating and transmitting the extension number by the lower n digits of the public number.

[0008]

When the dial-in connection system according to the present invention recognizes from the PBX 3 side that there is a dial-in call from the incoming exchange 2 (public network) to the corresponding PBX 3, the incoming exchange 2 will receive the PBX 3. The extension number digit number inquiry means 6 inquires about the lower digit of the public number of the extension number digit number to be sent to the side. On the PBX3 side, since the public number is assigned to the extension of the PBX in advance according to the extension number plan, the number of receivable digits is n.
The extension digit number request response signal returning means 7 returns the message to the destination switching center 2. The terminating exchange 2 (public network) recognizes from the response signal from the PBX 3 side that the number of receivable digits is n, and the PB
The extension n number generating and transmitting means 8 generates and transmits the last n digits of the public number to the X3 side, and the PBX 3 side calls the extension subscriber of the corresponding extension number.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A connection schematic diagram of an embodiment of the present invention is shown in FIG.
In the figure, 11 is an originating exchange station, 12 is an incoming exchange station, and 13 is P.
BX, 14 are calling subscribers, and 15 is an extension subscriber. PBX
Dial 13 extension subscribers 15 dial-in numbers (044-777-1234)
The extension number to be identified is the last three digits (234). The maintenance personnel intervene in advance to set the number of digits of the extension number on the PBX 13 side.

A connection sequence diagram of this embodiment is shown in FIG. The dial-in connection state of the PBX to the extension subscriber will be described with reference to FIGS. 2 and 3. In the figure, (1) A public number is assigned to the extension of the PBX 13, and the last n digits of the public number are set as the extension number. In the case of FIG. 2, it is 3 digits. (2) When the originating exchange 11 detects a call originating from the subscriber, it sends the public number 044-777-1234 of the originating subscriber 14 to the destination exchange 12. (3) The incoming call exchange 12 recognizes that the public number is accommodated in the PBX and notifies the PBX 13 of the incoming call. (4) When the PBX 13 recognizes the incoming call notification, the incoming call exchange 12
A primary response signal is sent to. (5) When the terminating exchange 12 recognizes the primary response from the PBX 13, it sends the extension digit number PB by the extension digit number request signal.
Contact X13. (6) The PBX 13 notifies the reception digit number 3 of the preset extension number by the extension digit number request response signal. (7) The incoming exchange 12 has an extension number for the number of digits (lower 3 digits) set by the extension digit number request response signal from the PBX 13.
Send (234). (8) The PBX 13 calls the subscriber with the extension number (234) and sends a response notification (secondary response) to the terminating exchange 12 by the extension response. (9) The terminating exchange 12 sends a response notice to the originating exchange 11, and the originating subscriber 14 and the extension subscriber 15 of the PBX 13 transit to a busy state.

[0011]

Since the switching center (public network) can recognize the number of extension transmission digits to the PBX by inquiring the PBX, the switching center (public network) intervenes the number of extension transmission digits of the PBX in advance by the maintenance person. No need to set. Therefore, for changes in the extension number system on the PBX side (changes in the number of extension receiving digits),
It is possible to flexibly cope with the number of digits sent from the exchange (public network) and the number of digits received in the PBX without mismatch.

[Brief description of drawings]

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

FIG. 2 is a connection schematic diagram of the embodiment.

FIG. 3 is a connection sequence diagram of the embodiment.

FIG. 4 is a connection schematic diagram of a conventional example.

FIG. 5 is a connection sequence diagram of a conventional example.

[Explanation of symbols]

 1,11,21 Originating switching center 2,12,22 Receiving switching center 3,13,23 PBX 4,14,24 Originating subscriber 5,15,25 Extension subscriber 6 Extension number digit number inquiry means 7 Extension digit number request Response signal return means 8 Extension number generation and transmission means

Claims (1)

[Claims] 1. A dial-in system in which a public number is allocated to an extension subscriber of a PBX and an incoming call is made to an extension of the PBX without going through a reception desk, and a dial-in connection to a corresponding PBX (3) is made to an incoming exchange (2). Is provided, the PBX (3) is provided with a means (6) for inquiring the number of digits of the extension number to be sent to the PBX (3).
, The number of receivable digits n determined by the extension number plan,
A means (7) for returning an extension digit number request response signal as a response to the inquiry from the terminating exchange (2),
The incoming exchange (2) is provided with means (8) for receiving the receivable digit number n from the PBX (3) side and generating and transmitting the extension number by the lower n digits of the public number, and the incoming exchange of the public network connection. When there is a dial-in connection to the PBX (3), the station (2) inquires the number of digits of the extension number to be sent to the PBX (3) and can receive it by a response signal from the PBX (3) side. A dial-in connection system characterized in that it recognizes that the number of digits is n and sends the last n digits of the public number to the PBX (3) side.