JPS63141496A - Private branch of automatic telephone exchange with night direct call transfer function - Google Patents

Abstract

PURPOSE:To transfer a night direct trunk line connected to a night subscriber's equipment to any extension telephone set by providing a trunk line transfer circuit to the night subscriber's equipment. CONSTITUTION:When a call comes to a night direct trunk line 1 and a bell of the night subscriber's equipment 2 rings via a night subscriber's switching circuit 3. In making a call in response to the incoming call, if a desired called party is directed to other party, the desired called party dials a special number given to a trunk line transfer circuit 6 by using an extension telephone set 8 located nearby. Thus, a call signal is sent from a line circuit 7 to the trunk line transfer circuit 6 to connect the switching circuit 3 and the line circuit 7. Thus, the talking with the trunk line 1 is attained to the extension telephone set 8.

Description

DETAILED DESCRIPTION OF THE INVENTION 1/1-1 - (Industrial Field of Application) The present invention relates to a private automatic telephone exchange, and more particularly to a private automatic telephone exchange having a switching function for main telephones at night.

[Conventional technology]

Conventionally, in this type of private automatic telephone exchange, the night direct office line and the night main telephone are directly connected one-to-one by a night telephone switching circuit (relay), etc., and then disconnected from the telephone line network of the private automatic telephone exchange. was.

[Problem that the invention seeks to solve]

In the conventional private automatic telephone exchange described above, the main telephone at night is separated from the telephone line network of the private automatic telephone exchange, so it is not possible to transfer night direct central office line calls received at night to other telephones. There are drawbacks.

[Means for solving problems]

The in-house automatic telephone exchange with night direct line call transfer function of the present invention connects a line circuit and a night main telephone switching circuit to the night main telephone when the line circuit is empty, and when a call is received on the night direct office line. , when the telephone number of the line circuit is dialed from a nearby extension telephone after the night telephone answers, a ringing signal from the line circuit is detected and the telephone answer is automatically answered;
It has a central office line transfer circuit that switches the connection of the night direct office line to the line circuit, automatically restores the connection when a restoration signal from the line circuit is detected, and restores the connection of the night direct office line.

[Effect]

Therefore, where can I receive nighttime direct central office line calls that arrive at the main telephone at night? It can also be transferred to two telephones.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of embodiments of a private automatic telephone exchange with night direct central line call transfer function according to the present invention.

At night, the night direct telephone line 1 and the night main telephone 2 are connected to the central office line 1 through the night main telephone switching circuit 3 in a known manner.
N1 is disconnected from rank 4 and line circuit 5, and the night direct communication station I! 1 and night main telephone 2 are connected one-to-one. The office line transfer circuit 6 is connected to the night main telephone 2, the night main telephone switching circuit 3, and the line circuit 7, and when the line circuit 7 is empty, it connects the night main telephone 2 and the night main telephone switching circuit 3, and the line When the circuit 7 is busy, the line circuit 7 is connected to the telephone switching circuit 3 at night.

When a call is received on the night direct telephone line 1, the night direct telephone line 1 - night main telephone switching circuit 3 - central office line transfer circuit 6 - night main telephone 2
During the night, the bell of telephone 2 rang, indicating that there was an incoming call. Then, a person near the telephone 2 at night answers the incoming call and makes a conversation.

X If the other party on the night direct call layer Fi11 is someone else, call.

The person who has been found out dials a specific extension telephone number given to the office line transfer circuit 6 from a nearby extension telephone 8. A calling signal is sent from the line circuit 7 to the office line transfer circuit 6 by a known extension line interconnection operation. The office line transfer circuit 6 detects the ringing signal and automatically responds, disconnects the night main telephone 2 from the night main telephone switching circuit 3, and connects the night main telephone switching circuit 3 to the line circuit≠M7. As a result, the night direct communication office line 1 - night main telephone switching circuit 3 - office line transfer circuit 6 - line circuit 7 - call route network 9 - line circuit 10 - extension telephone 8 is routed between the night direct communication office line 1 and the extension telephone 8. can make calls. At the end of the call, when the extension telephone 8 is turned on-hook, the connection between the extension telephone 8 and the central line transfer circuit 6 is disconnected by a known method, and a busy tone is sent to the central telephone transfer circuit 6.

The office line transfer circuit 6 automatically recovers by detecting the busy tone and becomes empty, disconnects the nighttime telephone switchover circuit 3 from the line circuit 7, and switches between the nighttime main telephone 2 and the nighttime main telephone switching circuit 3. will be connected and return to the original state.

〔Effect of the invention〕

As explained above, the present invention allows nighttime direct central office line calls that arrive at the main telephone at night to be answered within 1i! By having a central office line transfer circuit that can also transfer data to a telephone, if the content of the call requires you to bring a document, such as a drawing, at your seat, etc., or if the person called has gone elsewhere. ,
This has a very useful effect on work efficiency, such as when there is an incoming call from a person in another department, or when there is no one near the telephone at night and you have to answer from a far seat.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a private automatic telephone exchange with a function of automatically transferring calls to a central office during nighttime according to the present invention. 1...Night direct telephone line, 2...Night main telephone, 3
...Night main telephone switching circuit, 4.. Office line trunk, 5.7.10.. Line circuit, 6.. Office line transfer circuit, 8.. Extension telephone, 9..
...Call network. −〇 −

Claims (1)

[Scope of Claims] A private automatic telephone exchange having a nighttime main phone and a nighttime main phone switching circuit, and connecting the night direct office line and the night main phone at night by the nighttime main phone switching circuit, comprising: a line circuit; When the circuit is empty, the night main telephone switching circuit is connected to the night main telephone, a call is received on the night direct central office line, and after the night telephone answers, the telephone number of the line circuit is dialed from a nearby extension telephone. , detects a calling signal from the line circuit, automatically answers, switches the connection of the night direct office line to the line circuit, and automatically restores when a recovery signal from the line circuit is detected, and the night direct office line What is claimed is: 1. A private automatic telephone exchange with a nighttime direct central line call transfer function, characterized by having a central central line transfer circuit for restoring the connection.