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MBU 400 Installation Guide 31
Issue Causes Solutions
I cannot receive
landline calls.
I cannot make
Internet calls, the
VoIP indicator on
the MBU is not
lit, and the right
status indicator in
the upper left cor-
ner of the display
is black.
1) The country
setting is wrong.
1) The conguration
of the phone is
not complete.
2) The MBU has not
been reset after
you saved the
conguration.
3) The router uses
port forwarding.
1) Check that you have
chosen the country
that you are in. Open
the System settings
menu, choose Country
selection, and then
choose the country that
you are in.
1) Check that you have
congured your phone
properly. Go to
www.aastratelecom.
com and then click
Conguration. For more
information, contact
your Internet Telephony
Service Provider or your
System Administrator.
2) Reset the MBU and
allow the MBU 2
minutes to log in at
your Internet Telephony
Service Provider.
3) Check that you have
congured your router
so that it always assigns
the same IP address
to your phone’s MAC
address when using port
forwarding. Otherwise
incoming trafc is
probably not forwarded
to your phone. For more
information, check your
router’s manual.
Troubleshooting