Gigaset C450 IP User Manual page 55

Appendix
The display is blank.
1. The handset is not switched on.
¥
Press and hold the end call key
2. The battery is flat.
¥
Charge the battery or replace it
(page 6).
The handset does not respond to a key
press.
The keypad lock is activated.
¥
Press and hold the hash key
Base flashes in the display.
1. The handset is outside the range of the
base station.
¥
Move the handset closer to the base
station.
2. The base station is not switched on.
¥
Check the base station mains adapter
(page 7).
Please Register flashes in the display.
The handset is not registered.
¥
Register the handset (page 31).
Handset does not ring.
The ringtone is switched off.
¥
Activate the ringtone (page 35).
You cannot hear a ringtone/dialling tone.
Base station's phone cord has been replaced.
¥
When purchasing a new cord, ensure that it
has the correct pin connections (page 9).
When making calls from the fixed network,
the caller's phone number is not displayed
although CLIP (page 15) is set.
Phone number identification is not enabled.
¥
The caller should ask his network provider
to enable Calling Line Identification (CLI).
You hear an error tone when keying an
input
(a descending tone sequence).
Action has failed/invalid input.
¥
Repeat the operation.
Watch the display and refer to the user
guide if necessary.
54
a
.
#
(page 16).
You cannot connect to the router and the
phone is assigned a static IP address.
¥
Check on the router whether the IP address
is already being used by another device in
the LAN or belongs to the block of IP
addresses that is reserved on the router for
dynamic address assignment.
¥
If necessary, change the phone's IP address
(page 39).
You have made a call via VoIP but cannot
hear the other participant.
Your phone is connected to a router with NAT/
firewall.
¥
Your STUN server or outbound proxy set-
tings are incomplete or incorrect. Check the
settings (page 48, page 49).
¥
No outbound proxy is entered or the out-
bound proxy mode
(page 48) and your phone is connected to a
router with symmetric NAT or a blocking
firewall.
You cannot make calls via VoIP.
¥
Check whether your phone's Ethernet cable
is correctly connected to the router.
¥
Check your router's cable connection to the
Internet.
¥
Check whether your information for your
VoIP provider's SIP service is correct
(page 46).
You cannot establish a connection to the
phone with your PC's Web browser.
¥
When establishing a connection, check the
local phone IP address that has been
entered. You can check the IP address on
your handset.
¥
Check the LAN connections for the PC and
phone.
¥
Check that your phone can be reached.
Transmit a ping command to your phone,
e.g. from your PC (ping s <phone's local IP
address>).
¥
You have tried to reach the phone via a
secure http (https://...). Try again with
http://....
is activated
Never