KR19980034666A - Sender information provision method at exchange - Google Patents

Abstract

The present invention relates to a method for providing sender information at an exchange. Conventionally, an extension receiving a call ring is provided with only information on which leased line there is a call, and cannot know in advance which extension of the calling system is called. In case of a call received through another system through the leased line bypass function, there is a problem in which the system is not called. Therefore, the present invention provides a first step in which a caller transmits an ID transmission ready signal after transmitting a call signal from a transmitting system to a receiving system when the caller occupies the leased line and the trunk line; A second step of recognizing the call signal sent in the first step and transmitting an ID reception ready signal to the call system when the ID transmission ready signal arrives from the call side; In the second step, the calling system receiving the ID reception ready signal is performed in the third step of opening a call path that transmits a transmission completion signal that transmits caller ID. When the called station is busy, it can be called back by using the caller ID provided.

Description

Sender information provision method at exchange

The present invention relates to a method for providing sender information in an exchange using a DTMF transmitter and a DTMF receiver of an exchange. Particularly, a call system transmits information about a caller to a system receiving a call using a DTMF transmitter in a call through an analog dedicated line. The present invention relates to a method for providing sender information at an exchange where a called system analyzes caller information using a DTMF receiver and provides the called station with the incoming ring so as to know who the caller is.

A method for providing sender information in a conventional exchange includes: a first step of transmitting a call signal to a system where a call system is called when a caller occupies a dedicated line; The calling system recognizes a call signal and provides a dial tone to a calling system and prepares to receive a DTMF tone regarding a called extension number; A third step of determining an extension to be called by analyzing a call number transmitted from the call system; Providing a call ring to the extension determined in the above manner and displaying a line number on which the call is entered on the character display of the corresponding station; The called extension has a fifth step of answering the call ring and making a call with the caller.

When the caller occupies the leased line, the calling system sends the call signal to the called system by using the call signal transmission function.

Then, the called system recognizes the call signal transmitted from the call system by using the call signal receiving function.

The called system which recognizes the calling signal thus provides a dial tone to the calling system and prepares to receive a DTMF tone regarding the called extension.

When the called system prepares to receive a DTMF tone, the calling system sends the calling number dialed by the calling extension to the called system.

The types of DTMF tones that can be transmitted are '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' and '* There are 16 such as', '#', 'A', 'B', 'C' and 'D'.

The called system analyzes the call number to determine the extension to be called, provides the call ring to the corresponding station determined by the call, and displays the line number where the call came in on the letter indicator of the corresponding station.

The called extension answers the call ring and establishes a call with the caller.

However, in the conventional technology as described above, the station receiving the call ring is provided with only the information on which dedicated line the call was made, and it is not possible to know in advance which station of the calling system is called, and the other system through the leased line bypass function. In the case of a call received via, there is a problem in which system the call was made.

Accordingly, an object of the present invention for solving the conventional problems as described above is to use the sender information (Caller-ID) provided when the called extension is busy while also knowing who the caller is at the same time as the incoming ring The present invention provides a method for providing sender information at an exchange so that the call can be recalled.

1 is a DTMF code table of the sender information transmission of the present invention.

In order to achieve the above object, the present invention provides a method for providing sender information, comprising: a first step in which a caller transmits an ID transmission ready signal after transmitting a call signal from a transmitting system to a receiving system when a private line and a trunk line are occupied; A second step of recognizing the call signal sent in the first step and transmitting an ID reception ready signal to the call system when the ID transmission ready signal arrives from the call side; In the second step, the call system receiving the ID reception preparation signal opens a call path in which a transmission completion signal for transmitting call information (Caller ID) is opened.

Referring to the operation and effect of the present invention made of each step in detail as follows.

When the caller occupies the leased line, the calling system sends a call signal to the called system, sends an ID ready signal following the call signal transmission, and waits for an ID reception ready signal using a DTMF receiver.

At this time, the ID transmission ready signal is continuously transmitted until the DTms code 'D' 1000ms or ID reception ready recognition as shown in FIG.

At this time, the called system recognizes the call signal and checks whether the DTMF code 'D', which is an ID transmission ready signal, comes by using a DTMF receiver until a duration of 1000 ms or ID data is recognized.

When 'D', which is an ID transmission ready signal, arrives within the duration, an DTMF code 'C', which is an ID reception ready signal, is sent to the calling system for the duration and an ID is received which recognizes sender information (Callet-ID) using a DTMF receiver. Activate the function.

When the calling system receives the code 'C' which is the ID reception ready signal, the calling system transmits the caller information (Caller-ID), and the DTMF code 'D' corresponding to the ID transmission completion of the sender information transmission is 100ms. After a period of time, open the channel on the calling extension.

At this time, the called system receives all caller-IDs, and then the calling system provides a dial tone and prepares to receive a DTMF tone regarding the extension number to be called.

The calling system provided with the dial tone from the called system transmits the calling number dialed by the calling extension to the called system.

Then, the system to be called determines the extension to be called by analyzing the call number, and provides the call ring to the corresponding station. In addition, the line number and caller ID are displayed on the station's character display.

At this point, the called extension answers the call ring and establishes a call with the caller.

The sender information is transmitted in DTMF codes 'A' + x, 'B' + x, 'C' + X, and 'D' + x, where x is '0'-'9', '*', It consists of 12 codes such as '#', and all are sent in 48 combinations.

The duration of sending the sender information is 50ms and is distinguished from the ID transmission preparation code, the ID reception preparation code and the ID transmission completion code.

In addition, the duration can be divided into 50ms, 70ms, 90ms, etc., and all codes can be configured as a single code.

The above operation can be applied to a DID line in addition to a dedicated line.

The present invention allows the caller information provided only in the same system environment to be provided and used in different system environments when several systems are connected and used by an analog dedicated line network.

As described above, the present invention can know who the caller is at the same time as the incoming ring, it is effective to be called back by using the caller information (Caller-ID) provided when the called extension is busy.

Claims (3)

A first step of, when the caller occupies the leased line and the trunk line, transmits a call signal from the transmitting system to the receiving system and sends an ID transmission ready signal; A second step of recognizing the call signal sent in the first step and transmitting an ID reception ready signal to the call system when the ID transmission ready signal arrives from the call side; And a third step in which the call system receiving the ID reception ready signal in the second step sends a transmission completion signal for transmitting call information (Caller ID) to open a communication path. The method according to claim 1, wherein the ID transmission / reception ready signal and the transmission completion signal are encoded and transmitted by DTMF single code. The method of claim 1, wherein the call information and the sender information transmitted to the receiving side system are transmitted to the corresponding station and the caller is provided through the station display device at the same time. Sender information providing method in the exchange.