| Troubleshooting | 224Situation Cause SolutionEnsure that static images arenot displayed for long periods.Be aware that meetings that lastmore than an hour without muchmovement can have the sameeffect as a static image.Configure the automatic sleep timeor the screen saver.How to prevent monitor burn-in?Unsuitable monitor parameters. Consider decreasing the monitor’ssharpness, brightness, and contrastsettings if they are set to theirmaximum values.Call IssuesSituation Reason SolutionThe network is unavailable. Connect the network administrator.Your system cannot receivecalls when the far site dials youraccount.Check whether your account isregistered.You cannot receive calls.DND (Do Not Disturb) mode isenabled.Disable DND.The far site enables DND (Do NotDisturb) mode.Contact the far site to disableDND.The account is not registered Check whether the call partiesregister the accounts.At least one call protocol(SIP/H.323) is enabled.Fail to dial the IP address of the farsite.Ping the IP address of the far site.If it fails, contact the networkadministrator. Connect the networkadministrator.The far site system is powered off. Contact the far site to power on thesystem.The call protocol(SIP/H.323) thatfar site uses is different from yours.Both sites use the same callprotocol (SIP/H.323).Encryption negotiation (SRTP/H.235) fails.If one site uses encryption, ensurethat the other site enables theencryption too.You fail to call far site.The firewall blocks the traffics. Open necessary ports on thefirewall.
