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30 MBU 400 Installation Guide
Issue Causes Solutions
The POWER
indicator on the
MBU is not lit.
The I-NET
indicator on the
MBU is not lit.
There is no audio
when I make
Internet calls.
I cannot make
landline calls.
1) MBU is not
powered.
1) The Ethernet
cable is not
connected.
2) The router or
modem is not
powered.
3) The MBU cannot
retrieve an IP
address.
1) The router blocks
audio.
1) The landline
cable is not
connected.
2) The landline is
out of order.
1) Check that the MBU
power cord is connected
properly, and that the
adapter is plugged
into a power outlet. (If
possible, a continuous
power outlet.)
1) Check that the Ethernet
cable between the WAN
port on the MBU and
the LAN port on your
modem or router is
connected properly.
2) Turn on the power to the
modem or router.
3) In Internet settings,
check that the IP mode
corresponds to the IP
mode of your Internet
connection.
1) Use port forwarding.
Check your router’s
user manual to see
how to congure port
forwarding.
1) Check that the landline
cable between the Line
port on the MBU and
the telephone wall outlet
is connected properly.
2) Contact your landline
provider.
Troubleshooting