Terms containing call progress

Subject	English	Chinese
el.	call progress	呼叫进行
el.	call progress	呼叫进程
avia.	call progress	呼叫进展
el.	call progress indicator	呼叫进程指示器
el.	call progress message	呼叫进程消息
avia.	call progress message	呼叫进行消息
IT	call progress signal	呼叫进程信号
telecom.	call progress signal	呼叫进行信号
multimed.	call progress signal	呼叫进展信号
telecom.	call progress tone	呼叫进展音拨号音，回铃音，忙音，…
el.	call progress tone detector	呼叫进程音调探测器
IT	call progress tones	呼叫进行音
telecom.	call-in-progress	正在进行的通话数