JPS62188460A - Private branch of exchange - Google Patents

Abstract

PURPOSE:To automatically send a different busy tone by providing a busy tone sending means extracting information of external/internal line corresponding to an extension during talking stored in a memory and sending a different busy tone to a caller telephone set based on the information. CONSTITUTION:At the time of an extension telephone set 2a is in a talkable state with extension telephone sets 2b, 2c or a truck line, it is detected by a control means 6 and the information that the extension telephone set 2a uses an extension or an external line at present and is bush is stored in a memory 7. In using the extension 2c to make a call to the extensions 2a, 2b or an external line in this state, it is sent to the control means 6 and a busy tone is sent to the extension 2c from the storage information of the memory 7. In using the extension, a busy tone from the 1st busy tone generating circuit 4a, and in using the external line, a bush tone from the 2nd busy tone generating circuit 4b is sent to the calling extension 2c respectively.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is capable of transmitting different busy tones depending on whether the other party is making an internal call or an external call when the other party is busy in an internal call. This invention relates to a private branch telephone exchange configured as follows.

Conventional technologyIn general, when the other party is busy in a private telephone exchange,
Although the system is equipped with means for automatically transmitting a busy tone to the calling party's telephone, all conventional private telephone exchanges of this type have only one type of busy tone.

Problems to be Solved by the Invention Therefore, with this type of device, there is a problem in that it is completely impossible to determine whether the other party is busy using an internal line or an external line.

The present invention solves the above problems, and has the advantage that when the other party is busy, a different busy tone is automatically transmitted depending on whether the other party is using an internal or external line. The purpose of this project is to provide a private telephone exchange with the following features:

Means for Solving the Problems In order to achieve the above object, the present invention determines whether the extension telephone is busy using an extension line or an outside line each time the extension telephone is busy, A memory is used to store this information for each extension telephone, and a different busy tone is sent to the caller's telephone based on the information in this memory.

Therefore, according to the present invention, even if the other party is busy, it is possible to easily determine whether the other party is using an extension or an outside line, and in case of emergency, another extension telephone nearby can be used. It also has the effect of making it possible to make a call to someone else and tell the other party to end the call as soon as possible.

Embodiment The figure shows the configuration of an embodiment of a private branch exchange according to the present invention. In the figure, ■ is the communication path switch, 2a, 2b
, 2c are extension telephones connected to the call path switch 1 via extension circuits 3a, 3b, and 3c, respectively; 4a and 4b are first and second busy tone generating circuits that generate different busy tones; 5; 6 is a central office line circuit that connects the central office line, that is, an outside line, to the communication path switch 1; 6 is an extension circuit 3a, 3b, 3c, and a central office line circuit that inputs information from the central office line circuit 5 to control the communication path switch 1; 3b, 3c, control means equipped with a microcomputer etc. for controlling the office line circuit 5, etc.; 7, extension telephones 2a, 2b, 2c comrades or extension telephones 2a, 2b;
, 2c and an outside line, this is a memory that stores information for each extension telephone 2a, 2b, and 2c as to whether the line in the talking state is an extension line or an outside line. .

In the above embodiment, the current extension telephone 2a is the extension telephone 2
When a call is made to an extension line 3b, 2c or an outside line, the call is transmitted to the control means 6 through the extension telephone circuit 3a, and the control means 6 controls the communication path switch 1 to switch the extension circuit 3a to the extension circuit 3b, 3c or the central office line. Connect it to circuit 5. In this way, extension telephone 2a becomes extension telephone 2b.
, 2c or the central office line, the control means 6 detects this and stores in the memory 7 information that the extension telephone 2a is currently talking using the extension or outside line. The telephones currently talking to extension telephone 2a are extension telephones 2b and 2c.
If so, information is stored in the memory 7 that the extension telephones 2b and 2c are also busy using their extensions.

Now, in this way, the extension telephone 2a is talking to the extension telephone 2b or an outside line, and the memory 7 stores each extension telephone 2.
It is assumed that information is stored that a and 2b are currently talking through an extension line or an outside line. In this state, if you use the extension telephone 2c to make a call to the extension telephones 2a, 2b or an outside line, this will be transmitted to the control means 6, and based on the information stored in the memory 7, a busy tone will be sent to the extension telephone 2c. The communication path switch 1 is controlled so as to send out the following.

In this case, each extension telephone 2a, 2 is stored in the memory 7.
Since information on whether an extension line or an outside line is being used is stored for each line b, if an extension line is currently being used, the busy tone from the first busy tone generation circuit 4a will be emitted. , when an outside line is being used, the call path switch l is controlled so that the busy tone from the second busy tone generating circuit 4b is transmitted to the extension telephone 2c that has respectively made the call. Therefore, the calling side extension telephone 2c can easily determine whether the other party's extension telephones 2a, 2b are talking through the extension or outside line just by listening to the busy tone.

Effects of the Invention As is clear from the above-mentioned embodiments, the present invention stores information such as whether an internal line or an outside line is being used for each extension telephone during a call in a memory, and the information differs depending on the information. The system is configured so that the busy tone is transmitted to the extension telephone of the calling party that made the call to the extension telephone in use, and therefore, if the busy tone is heard on the extension telephone of the calling party, the extension telephone of the other party is heard. This has the advantage that it can be easily determined whether the telephone is busy using an extension line or an outside line, and that it is easy to take measures in case of emergency.

[Brief explanation of drawings]

The figure is a schematic diagram of an embodiment of a private telephone exchange according to the present invention. l...Call path switch, 2a-2c...extension telephone, 33-3c...extension circuit, 4a14b...first,
Second busy sound generation circuit, 5... Office line circuit, 6... Control means, 7... Memory.

Claims (1)

[Claims] It has a memory that determines whether the line in use is an extension or an outside line and stores this information for each extension telephone, and a memory that detects when an operation is performed to call the extension telephone in use from another telephone. A premises comprising a busy tone transmitting means for retrieving the information of the external extension corresponding to the extension telephone in use stored in the memory and transmitting a different busy tone to the calling party telephone based on this information. telephone exchange.