ringing period

同义词释义

1)ringing period,振铃时间，呼叫时间2)duration of call,呼叫时间3)ringing time,ring time,振铃时间4)call release time,呼叫释放时间5)duration of call,呼叫通信时间6)MTBC (mean time between calls),平均呼叫时间