Issue Possible Cause & Solution ReferenceI cannot call entries in thephonebook.• You are trying to make a TEL line call, but the unit is not setto make TEL calls.→ Make sure the "Line Selection" setting is set to "IP +TEL".page 26• You are trying to make an IP line call, but the "OperationMode" 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.page 29The unit returns to standbymode while adding orediting phonebook entries.• 1 minute has passed since you pressed a button.→ If you pause for over 1 minute while adding or editingphonebook entries, the unit returns to standby mode.—ProgrammingIssue Possible Cause & Solution ReferenceThe unit returns to standbymode while programmingthe unit.• 1 minute has passed since you pressed a button.→ If you pause for over 1 minute while programming the unit,the unit returns to standby mode.—I cannot program the unit. • You are on a call.→ Program the unit once you have finished the call. —• A call is being received.→ The unit exits programming mode automatically when acall is received. Program the unit again once you havefinished the call.—After I changed thesettings, the changes donot take effect.• The unit must be restarted before the new setting becomeseffective.→ Restart the unit.page 47The DTMF tone signalsent from the unit is notdetected by the other partyor PBX.• The DTMF type differs from the type used by the other partyor PBX.→ Make sure that the "DTMF Type" setting matches theother party's or other PBX's setting.page 59Display MessagesMessage Possible Cause & Solution ReferenceBusy • The called party is busy (displayed for IP calls only).→ Try again later. —72 Operating Instructions Document Version 2011/06Troubleshooting