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MBU 400 Installation Guide 33
1) The MBU is
not logged in
at the Internet
Telephony
Service Provider.
2) The router is
turned off.
3) The SIP server is
down.
4) The Internet
connection is
down.
1) I need to know the
software version
currently installed
on my MBU 400.
1) Check that all cables
are connected properly,
and check that power
is turned on, and then
reset the MBU.
2) Turn on the router.
3) Contact your Internet
Telephony Service
Provider.
4) Contact your broadband
provider.
1) a) Press the + (UP)
button on the side of the
handset to connect to
the base.
b) Scroll down to see
the Version SW: xx.xx
eld.
For more information
about viewing the
MBU 400 software
version, see “Viewing
the MBU 400 IP
Address and Status
Information” on
page 21.
Issue Causes Solutions
I cannot make
Internet calls,
but it worked
yesterday.
How do I
determine the
software version
of my Handset?
Troubleshooting