Possible reasons: the host to the extension or to lock the fracture.Processing method: check the host machine to the extension of the main line is broken, the host to lock the L+.L- line is short circuit and fault. Replace the same type of mainframe and extension test.
Date:
2016
-
08
-
12
Views：6
Possible reasons: ringing line fault, such as a ringing bad host.Processing method: check the host's room number line is broken, the replacement of the same type of host test.
Date:
2016
-
08
-
12
Views：6
Possible reasons: the host to the extension of the audio signal line breaks,Processing method: check the host to the extension of the main line of the 1.2. is short circuit and fault.
Date:
2016
-
08
-
12
Views：8