KR19990048001A - Dual tone complex frequency signal transmission method - Google Patents

Abstract

The present invention relates to a method for transmitting a dual tone complex frequency signal from a calling station to a called station. According to the present invention, when a called party number is pressed by a predetermined caller, the calling station generates a DTMF signal corresponding to the pressed called party number and transmits the DTMF signal corresponding to the called party's information. Suggest a way to send together. At this time, the sender information transmitted includes at least the caller grade and the caller ID. According to the present invention, since the called party can receive the caller information from the calling party, there is an effect that the service can be provided by the caller class and also the malicious call can be tracked.

Description

Dual tone complex frequency signal transmission method

The present invention relates to a method for transmitting a dual tone complex frequency signal, and more particularly, to a method for transmitting a caller's information together with a called party's number at the calling party.

In general, in an exchange system such as a private exchange or a key phone system, the calling party and the called party enter the numbers requested by the calling party and the called party and transmit them to the other party. At this time, the signal between the calling station and the called station may be transmitted according to a dual tone multi frequency (DTMF) signaling method or an R2 signaling method.

According to the R2 signaling system, when the called party number is pressed by the calling party, the calling party's information is transmitted to the called station together with the called party number. Here, the calling party information includes information on the calling party grade, calling party number, called party status, and the like, and the calling party information is transmitted in response to the request from the called party. Therefore, the called party can provide the service according to the caller class by using the information provided from the calling party, and can also track the call of the malicious (caller number inquiry).

On the other hand, according to the DTMF signaling method as shown in FIG. 1, when the called party number is pressed by the calling party, only the called party number is transmitted to the called station. That is, the DTMF signaling method uses only a forward signal, and provides only the called party number pressed by the sender when transmitting a signal to the called party. Therefore, there is a disadvantage in that a terminating country that supports DTMF signaling cannot perform services according to the calling party class, and cannot perform malicious call tracking.

On the other hand, in recent years, more and more recipient countries require caller information. For example, it can be said that PC communication corresponds to such a case, that is, a case where the destination station requires the caller's information. Considering this trend, it is desirable to make the called station and the calling station comply with R2 signaling. However, if the called station does not follow the R2 signaling method, even if the calling station transmits the caller's information, it cannot be provided, and as a result, the quality of service may be degraded.

Accordingly, an object of the present invention is to provide a method for receiving caller information from a calling station even in a called station according to DTMF signaling.

Another object of the present invention is to provide a method for allowing a terminating station according to DTMF signaling to provide a service according to a calling party class.

It is still another object of the present invention to provide a method for allowing a called station to track a malicious call by calling a calling party number based on DTMF signaling.

According to the present invention for achieving the above objects, when a called party number is pressed by a predetermined caller, the calling station generates a DTMF signal corresponding to the pressed called party number and transmits it to the called station. We propose a method of generating and transmitting DTMF signals together. At this time, the sender information transmitted includes at least the caller grade and the caller ID.

1 is a view showing a processing flow for transmitting a dual tone complex frequency signal according to the prior art.

2 is a view showing the format of a dual tone complex frequency signal transmitted in accordance with the present invention.

3 is a flowchart illustrating a process of transmitting a dual tone complex frequency signal according to the present invention;

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or chip designer, and the definitions should be made based on the contents throughout the present specification.

2 is a diagram illustrating a format of a signal transmitted when DTMF signals are transmitted according to the present invention, and FIG. 3 is a diagram illustrating a processing flow of DTMF signal transmission according to the present invention.

Now, assuming that the predetermined caller has pressed the called party number (step S31 in Fig. 3), the calling station receives a DTMF signal corresponding to the pressed called party number (step S32). When the DTMF signal corresponding to the called party number is received, the calling station transmits a series of caller information having a structure as shown in FIG. 2 to the called station. The calling station generates a DTMF signal corresponding to the calling party class and transmits it to the called station (step S33), generates a DTMF signal corresponding to the discriminator (0), and sends it to the called station (step S34). Generate a DTMF signal corresponding to the receiver (step S35), generate a DTMF signal corresponding to the identifier (*), and transmit the DTMF signal to the called station (step S36), and transmit a DTMF signal corresponding to the called party number. It generates and transmits to the destination station (step S37).

Referring to FIG. 2, the calling party grade 21 and the calling party number 23 are first transmitted to the called party and then the called party number 25 is transmitted in front of the called party number that the caller presses during DTMF call. The sender class initially transmitted consists of two digits representing the class of the sender. After the sender class 21 is transmitted, a distinguisher "0" is transmitted, which distinguishes the caller class 21 and the caller ID 23. The caller ID 23 usually includes the area code and indicates the caller's telephone number. After the caller number 23 is transmitted, the called party number 25 is transmitted. The distinguisher 24 for distinguishing the calling party number 23 and the called party number 25 is called party number 25 is transmitted. Is sent before.

According to the prior art, only the called party number 25 of the DTMF signal format shown in FIG. 2 is transmitted. However, in the present invention, caller information (caller rating, calling party number) is transmitted together with the called party number 25. When the DTMF signal as shown in FIG. 2 is sequentially transmitted, the called station checks the called party by using the called party number 25 after receiving the DTMF signal according to the transmission. Thereafter, the called party creates a ring and sends it to the identified called party.

As described above, according to the present invention, even when the called station receives a signal from the calling station according to the DTMF signal system, the called party receives the caller information as well as the called party number. Accordingly, the receiving station can provide services according to the calling party class, and also has the advantage of tracking the call by looking up the calling party number.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (6)

In the method for transmitting a dual tone complex frequency signal, When the called party number is pressed by a predetermined caller, the calling station generates a double tone complex frequency signal corresponding to the pressed called party number and transmits it to the called station. Generating and transmitting together. 2. The method of claim 1, wherein the caller information includes at least a caller class and a caller number. In a method for transmitting a dual tone complex frequency signal from a calling party having subscriber information to a called station, (A) the receiving station receiving a duplex tone frequency signal corresponding to the called party number when the called party number is pressed by a predetermined caller; (B) generating, by the calling station, a duplex tone frequency signal corresponding to the calling party class in response to receiving the duplex tone frequency signal corresponding to the called party number and transmitting the signal to the called station; (C) after the step (b), the calling station generates a dual tone complex frequency signal corresponding to the calling party number and transmits it to the called station; And (d) after the step (c), the calling station generates a dual tone complex frequency signal corresponding to the called party number and transmits it to the called station. 4. The dual tone complex frequency signal of claim 3, wherein the calling station generates and transmits a dual tone complex frequency signal corresponding to the calling party class and then transmits a duplex tone frequency signal corresponding to a first discriminator for distinguishing the calling party class from the calling party number. Generating and transmitting the; Generating and transmitting a duplex tone frequency signal corresponding to the calling party number and generating and transmitting a duplex tone frequency signal corresponding to a second discriminator for distinguishing the caller number and the called party number. Characterized in that the process. 5. The method of claim 4, wherein the first discriminator and the second discriminator are different. 6. The method of claim 5, wherein the first discriminator is "0" and the second discriminator is "*".