... 振铃脉冲：ring-down pulse 振铃键，呼叫键：ringing key 振铃继电器，呼叫继电器：ringing relay ...
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短语
通话呼叫振铃键
speaking and ringing key
听唤振铃键
listening and ringing key
振铃电键
[通信]
ringing key
;
challenge switch
;
bell key
;
key ringing
无键振铃
keyless ringing
听话振铃合用键
combined line & ringing key
键振铃
ringing keyless
通话振铃电键
key speaking and ringing
同线电话振铃电键
party line ringing key
-
ringing key
assignment key
-
ringing key
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