The electrical attributes of a
PSTN port does not comply
with the local standard.
The fault occurs on all
subscribers of the device.
The fault occurs on
subscribers of certain ports
on the device.
The fault occurs on
subscribers using certain
numbers.
Start
The subscriber line and the
phone are faulty.
End
The voice board is faulty.
The electrical interference
exists in the device or
subscriber line environment.
The DDF and grounding do
not comply with the local
standard.
The input and output gains
of the DSP chip do not
comply with the local
standard.
Confirm
the fault scope.
Number-related
configurations on the
softswitch and voice
gateway are incorrect.
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