| Troubleshooting |
224
Situation
Cause
Solution
Ensure that static images are
not displayed for long periods.
Be aware that meetings that last
more than an hour without much
movement can have the same
effect as a static image.
Configure the automatic sleep time
or the screen saver.
How to prevent monitor burn-in?
Unsuitable monitor parameters.
Consider decreasing the monitor’s
sharpness, brightness, and contrast
settings if they are set to their
maximum values.
Call Issues
Situation
Reason
Solution
The network is unavailable.
Connect the network administrator.
Your system cannot receive
calls when the far site dials your
account.
Check whether your account is
registered.
You cannot receive calls.
DND (Do Not Disturb) mode is
enabled.
Disable DND.
The far site enables DND (Do Not
Disturb) mode.
Contact the far site to disable
DND.
The account is not registered
Check whether the call parties
register the accounts.
At least one call protocol(SIP/
H.323) is enabled.
Fail to dial the IP address of the far
site.
Ping the IP address of the far site.
If it fails, contact the network
administrator. Connect the network
administrator.
The far site system is powered off. Contact the far site to power on the
system.
The call protocol(SIP/H.323) that
far site uses is different from yours.
Both sites use the same call
protocol (SIP/H.323).
Encryption negotiation (SRTP/
H.235) fails.
If one site uses encryption, ensure
that the other site enables the
encryption too.
You fail to call far site.
The firewall blocks the traffics.
Open necessary ports on the
firewall.