JP2756487B2 - Conference calling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a private branch exchange (hereinafter simply referred to as a PBX) and a dealing system, and is particularly suitable for convening a regular meeting every day. Related to the call system.

[Conventional technology]

Conventionally, as a conference call including a subscriber of an office line, there has been a limit to a three-way call in which one office line of two extensions or two office lines of one extension participate.

Hereinafter, a conventional recruiting method will be described with reference to FIG.
First, the meeting convener 9 calls a line subscriber, holds the line during a call (FIG. 2 (1)), calls another extension or line by dial operation (second line). (FIG. 2 (2)), and thereafter, the state is shifted to a three-party communication state (FIG. 2 (3)). Japanese Patent Application Laid-Open No. 63-115445 discloses a technique related to this.

[Problems to be solved by the invention]

In the above-mentioned conventional conference call system, the convenor of the conference,
Although this method calls the participants of the conference, it is a regular conference and no consideration is given to the case where the number of conference participants is large.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a conference call system in which any participant can freely participate in a predetermined time period of a conference, not by calling a convener.

[Means for solving the problem]

The above object is achieved as follows. That is, a PBX that accommodates the office line and a behind-the-scene P equipped with a conference trunk.
The BX is composed of a BX, and the extension and the leased line are accommodated in the behind-the-scene PBX through a line and a leased line trunk for a conference.

The PBX has a direct inline function, automatically connects incoming calls from office lines to the line circuit,
Pull into the conference trunk via X's trunk. On the other hand, the extension and leased line accommodated in the behind PBX are
It is drawn into the conference trunk by the special number dial. The conference trunk is composed of a mixing amplifier and a branch amplifier, and can make a conference call between lines connected to the conference trunk.

[Action]

The PBX does not have a means to detect the end-of-line call on a DC basis in the connection between the extension and the office line. Therefore, if the office line subscriber leaves the conference during a conference call, the busy tone (hereinafter referred to as the BT tone) Written as
Is mixed in the conference call. When the line exits from the conference call, press * on the PB dial as the recovery number. The trunk trunk of the behind-the-scenes PBX is identified as being recovered by receiving the * signal and the trunk is released. Will not be mixed.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an exchange according to the present invention. In FIG. 1, block 1 is a PBX, 2 is a central office trunk, and 3 is a line circuit. on the other hand,
Block 4 is a behind PBX, 5 is a conference line trunk, 6 is a conference line circuit, 7 is a conference OD telephone trunk, and 8 is a conference trunk. Reference numeral 9 denotes a 2W general telephone (such as a 601 telephone), and reference numeral 10 denotes a tall dialing device (hereinafter referred to as TDE).

Next, the operation of a conference call according to the present invention will be described with reference to the block diagram shown in FIG. The office line arriving at the office trunk 2 of the PBX 1 is automatically connected to the line circuit 3 by the direct inline function of the PBX 1, and arrives at the office telephone trunk 5 for behind-the-scenes PBX 4. The conference line trunk 5 automatically answers and connects to the conference trunk 8, and the line is accommodated in the conference trunk 8.

Further, the telephone 9 and the TDE 10 are connected to the conference line circuit 6 and the conference OD telephone trunk 7, respectively, and are accommodated in the conference trunk 8 by special dialing of the conference participants. The conference trunk 8 is composed of a mixing amplifier and a branch amplifier, and enables a conference call between a plurality of connected lines.

〔The invention's effect〕

According to the present invention, since it is possible to arbitrarily participate in a conference call by operating from a central office line, it is possible for a business traveler to participate in a conference call from a business trip destination in a conference in which the time zone is determined in advance.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment according to the present invention, and FIG. 2 is a block diagram showing a conventional example. 1 ... PBX, 2 ... Office trunk, 3 ... Line circuit,
4 ... behind PBX, 5 ... conference line trunk, 6 ...
… Conference line circuit, 7… conference OD telephone trunk,
8: Conference trunk, 9: General telephone, 10: TDE

Claims (1)

(57) [Claims] 1. A conference trunk circuit for making a conference call between a plurality of lines, and a conference line circuit for connecting a telephone, wherein the conference line circuit is directly connected to the conference trunk by a first telephone line. A conference line trunk for connecting a line, the conference line trunk being directly connected to the conference trunk by a second telephone line, and receiving a predetermined special number dial from the telephone, First conference call connection means for connecting a telephone to the conference trunk via the first telephone line; and, when there is an incoming call in the conference line trunk, automatically responding to the incoming call and receiving the incoming call A second conference call connection means for connecting a central office line to the conference trunk via the second telephone line; and receiving a specific dial signal from the central office line during the conference call, The conference office line trunk that you want to open,
A conference call restoring means for restoring the office line from the conference call, wherein any participant can connect to the conference trunk using the telephone or the office line.