| 摘要 |
PURPOSE:To easily inform a locating position from a general subscriber telephone set to a line control part. CONSTITUTION:This system is comprised in such a way that a function to output a dual tone multi-frequency signal in a form of sound is attached on a portable telephone terminal 13a, and for example, a signal is introduced to the general subscriber telephone set 15 via a sound coupler 200, and the locating position is informed to the line control part 11a by making a call. |
