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32 MBU 400 Installation Guide
Issue Causes Solutions
4) a) Use port forwarding.
The default SIP port is
5060, and the default
RTP port is 5004.
Ensure that your router
always assigns the
same IP address to your
phone when using port
forward ing. For more
information, check your
router’s manual.
5) Check your router’s user
manual to see how to
update the rmware.
1) a) Reduce the amount
of trafc on your
broadband connection.
b) Sign up for a Quality
of Service agreement
with your broadband
provider.
c) Order a connection
with higher speed
from your broadband
provider.
2) Contact your Internet
Telephony Service
Provider regarding
ensured voice
prioritization across the
network.
When I make
Internet calls, the
sound quality is
poor.
4) The router
blocks Internet
telephony.
5) The router
rmware needs
updating.
1) There is too much
simultaneous
data trafc on
your broadband
connection.
2) Your Internet
Telephony
Service
Provider’s
Quality of
Service is based
on a “best
efforts” rather
than a guaranteed
voice priority
method.
Troubleshooting