公开(公告)号：US09769322B2

公开(公告)日：2017-09-19

申请号：US15190257

申请日：2016-06-23

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Jae-Hong Ruy ,  Hyo-Chan Bang ,  Byeong-Cheol Choi ,  Hoon Jeong

IPC: H04M11/00 ,  H04M11/06 ,  H04L12/10 ,  H04L29/08 ,  H04M7/12 ,  H04M19/00

CPC classification number: H04M11/06 ,  H04L12/10 ,  H04L67/12 ,  H04M7/1295 ,  H04M11/066 ,  H04M19/001 ,  H04M2203/60

Abstract: Disclosed herein are a telephone, a switchboard, and a method for sending a message between the telephone and the switchboard using a Dual Tone Multiple Frequency (DTMF) signal. The telephone includes a sensor interface unit for collecting sensing signals by being connected to sensors, a transmission unit for generating a message using the sensing signals, converting the message into a DTMF signal, and transmitting the DTMF signal and a telephone signal, and a power distribution unit for being supplied with power from the switchboard and distributing the power to operation units.