METHOD FOR DETECTING A CHARGE-FREE ANNOUNCEMENT BY THE TRANSIT TRUNK SYSTEM AND RING-BACK TONE SERVICE METHOD USING THE SAME

摘要

The present invention is clearly distinguished, and use it for a range of the relay line service detects the boundary between the different ring back tone and a non-charging instructions transmitted from the receiver-side switching center at the relay line system of the telecommunication provider of the relay circuit to the carrier the present invention relates to a method and a virtual number ring back tone service method using the same that separates the non-charging instructions sent from the receiver-side switching center in a relay line system for providing certain value-added services. A procedure for dividing the non charging instructions sent from the receiver-side switching center from a variety of ring back tone from the relay circuit system according to the invention (a) installing a relay circuit system wavy pattern comparison means for detecting a non-charging guide in, each communication further comprising: pre-storing a waveform pattern for the non-charging instructions operator, (b) obtain information about the called-party service provider from the call (call) which is connected through a relay circuit required information, of the corresponding non-charging guide pattern predetermined Loading step in a memory device, (c) detecting the non-charging guide in the signal from the transmission after the receiver-side switching center connected through a waveform pattern comparing means, and (d) tracking the starting point of the non-charging instructions detected by the waveform pattern comparison It characterized by comprising the step of recording.