电话信道 phone channel ; [通信] telephone channel ; speech channel ; voice frequency grade channel

来话信道 ICH Incoming CHannel ; ICH

去话信道 OCH Outgoing CHannels

通话信道 talk channel ; talking path

最低去话信道 lowest outgoing channel ; LOC

会话信道 Sessionful Channel

载波电话信道 carrier telephone channel ; channel carrier telephone

电话信道之等化 equalization of telephone channel

明线载波电话信道 open-wire carrier telephone channel

电话信道等化 telephone channel equalization of