Doro IP880 DECT Owner's Manual page 41

Problem
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.
I cannot make Internet
calls, but it worked
yesterday.
When I make Internet
calls, the sound quality
is poor.
Index
Possible Causes
1) The configuration
of the phone is not
complete.
2)
The gateway has
not been reset
after you saved the
configuration.
3) The router uses port
forwarding.
4) The router blocks
Internet telephony.
5) The router firmware
needs updating.
1) The gateway is not
connected to the
Internet.
2) The router is turned
off.
3) The SIP server is
down.
4)
The Internet
connection is down.
1) There is too much
simultaneous data
traffic on your
connection.
2) Your Internet
Telephony Service
Provider's Quality of
Service is based on a
"best efforts" rather
than a guaranteed
voice priority
method.
www.doro.com
Possible Solutions
1) Check that you have configured
your phone properly.
2) Reset the gateway and allow the
gateway 2 minutes to log in at your
Internet Telephony Service Provider.
3) Check that you have configured
your router so that it always assigns
the same IP address to your phone's
MAC address when using port
forwarding. Otherwise incoming
traffic is probably not forwarded to
your phone. For more information,
check your router's manual.
4)
a) Try disabling STUN. Open the
Internet settings menu, choose
STUN mode, and select Disabled.
Reset the gateway.
b) 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
forwarding. For more information,
check your router's manual.
5) Check your router's user manual
to see how to update the
firmware.
1) Check that all cables are
connected properly, and check
that power is turned on, and then
reset the gateway.
2) Turn on the router.
3) Contact your Internet Telephony
Service Provider.
4)
Contact your broadband
provider.
1) a) Reduce the amount of traffic
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.
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