基本释义:

占线信号灯，忙灯

网络释义

1)busy lamp,占线信号灯，忙灯

2)engaged lamp,占线信号灯

3)visual busy-lamp,占线灯信号，占线指示灯

4)busy back,busy back signal,busy signal,占线信号;忙信号

5)Busy signal,忙音;占线信号

6)audible busy signal,busy back,忙音信号(占线信号)