User Manual

18
When I make
Internet calls, the
sound quality is
poor.
1. There is too much simultaneous
data traffic on your broadband
connection.
1. Reduce the amount of traffic on
your broadband connection.
2. Sign up for a Quality of Service
agreement with your broadband
provider.
3. Order a connection with higher
speed from your broadband
provider.
Router Problem Possible causes Things to check
I cannot make
Internet calls, the
VoIP indicator on
the gateway is not
lit, and the right
status indicator in
the upper left corner
of the display is
black.
1. The configuration of the
DUALphone is not complete.
2. The gateway has not been reset
after you saved the configuration.
3. The router or modem has not
assigned an IP address to the
DUALphone.
4. The router blocks Internet
telephony.
5. The router firmware needs
updating.
1. Check that you have configured
your DUALphone properly. Go
to www.dualphone.net/lan and
then click Configuration. For
more information, see, How to
Configure the DUALphone in
this guide or in the User Manual
or contact your Internet
Telephony Service Provider.
2. Reset the gateway and allow the
gateway 2 minutes to login at
your Internet Telephony Service
Provider.
3. Check that your router or modem
is working properly. Check the IP
address by pressing the volume
up key on the handset. The
handset must be in the status
window status mode to do this.
4. a) Change the configuration to
disable STUN. For more
information, see the User Manual
or contact your Internet
Telephony Service Provider.
b) Use port forwarding. The
default SIP port is 5060, and the
default RTP port is 5004. If you
use Port Forwarding, you must
use static IP mode. For more
information, check your router’s
user manual.
5. Check your router’s user manual
to see how to update the
firmware.
I cannot make
Internet calls, but it
1. The gateway is not logged in at
the Int
ernet Telephony Service
1. Check that all cables are
connected properly, and then