音频线路 meaning in English

voice band line
voice line
voice-grade line

There seems to be a bug in the i / o setup window that fails to create mono input paths
在输入输出设置里有一个程序错误。无法建立一个单声道的音频线路。
Apparatus for connection to private circuits run by certain public telecommunication operators - specification for apparatus for connection to speechband circuits
英国通信网专用线路的连接设备.第1部分:音频线路连接装置规范
If a device supports , for instance , both gsm and bluetooth , the pcm lines from the gsm chipset might be directly wired to the bluetooth chip s pcm audio lines
例如，如果设备同时支持gsm和bluetooth ， gsm芯片组的pcm线路可以直接与bluetooth芯片的pcm音频线路连接。