signalling tone (ST)

基本解释信令音

网络释义

1)signalling tone (ST),信令音2)"Two Points Modulation",亚音信令3)acoustical signaling,声信令,音响信令4)signaling and channel,信令语音信道5)speech digit signaling,语音数字信令6)VFSS Voice Frequency Signaling System,音频信令系统