语音对讲呼叫机，被叫端，被动接收呼叫为呼叫端，主动发起呼叫。

Voice intercom call machine, called side, passive side receives the call as a call, to initiate the call.

youdao

语音对讲呼叫机，被叫端，被动接收呼叫为呼叫端，主动发起呼叫。

Voice intercom call machine, called side, passive side receives the call as a call, to initiate the call.

youdao