speaking and ringing key 通话呼叫振铃键
talk-ringing key 呼叫通话两用键 ; 通话振铃键
listening and ringing key 听唤振铃键
combined line & ringing key 听话振铃合用键
talk ringing key 通话振铃键
party line ringing key 同线电话振铃电键
combined line and ringing key 听话振铃合用键
combined ringing and speaking key 通话呼叫合用键
key ringing 振铃电键
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