TroubleshootingIf you are experiencing trouble, refer to the information in this section. Before troubleshooting, confirm allconnections (see page 22) and confirm that the AC outlet or PoE device to which the unit is connected to isreceiving power.General UseIssue Possible Cause & Solution ReferenceThe display is blank. • The unit is not receiving power.→ The unit is not designed to function when there is a powerfailure. Make sure that the unit is connected to the ACoutlet and receiving power. If using PoE, confirm that thedevice supplying PoE is receiving power and that the LANcable is properly connected.page 22The unit is not performingproperly.• Cables or cords are not connected properly.→ Check all connections. page 22• An error has occurred.→ Reset the unit. Disconnect the unit from the AC outlet, wait10 seconds, then connect the AC adaptor again. If usingPoE, disconnect the LAN cable, wait 10 seconds, thenconnect the LAN cable again.page 22Making and Receiving CallsIssue Possible Cause & Solution ReferenceI cannot make IP calls. • The IP line is not selected.→ Before dialing, confirm that "IP" is shown in theupper-right corner of the display. Press the center functionbutton ([F2]) to change the line if necessary.page 30• The IP address was entered incorrectly.→ Confirm that you have entered the IP address of the otherparty correctly.page 31• The "Operation Mode" setting is not correct.→ Change the setting to "Peer to Peer" if you want tomake or receive peer to peer IP calls (i.e., calls made byspecifying the called party's IP address).→ Change the setting to "IP-PBX" if you want to make orreceive intercom and outside calls as a SIP extension ofthe connected PBX.→ When the setting is "USB Audio", you cannot make orreceive IP calls. Change the setting to "Peer to Peer"or "IP-PBX".page 26• Consult your system administrator. —60 Operating Instructions Document Version 2010/02TroubleshootingTroubleshooting