equipment connected to the unit, nor with allservices provided by telecommunicationsproviders over networks connected to the unit.For Best Performance• Use the unit in a quiet room. Ambient noise of lessthan 50 dBA is recommended.• Use the unit in a room with minimal echoing. Do notplace the unit near walls, windows, partitions, etc.• During the first 30 seconds of a TEL call, the unitadjusts itself for optimal sound quality. Speak inturns with the other party at the beginning of aconversation. (The time required varies dependingon the condition of the telephone line and the audiocharacteristics of the room.) During this time, soundmay cut out or fade in and out. This is normal.• Do not obstruct the unit during calls. Keep yourhands, as well as common objects such as folders,cups, and coffee pots away from the unit duringcalls.Data SecurityWe recommend observing the security precautionsdescribed in this section, in order to prevent thefollowing:– loss, disclosure, falsification, or theft of userinformation– unauthorized use of the unit– interference or suspension of use caused by anunauthorized partyWe cannot be responsible for damages resultingfrom the misuse of this product.Note• This product can be used to store and log userinformation. User information is defined as thefollowing:– phonebook entry names, phone numbers,IP addresses, SIP extension numbers andSIP URIs– call history (redial list)– recordings stored on the SD memory cardPreventing Data Loss• Use a computer to make periodic backups ofrecordings stored on the SD memory card.• Keep a separate record of all information stored inthe phonebook.Preventing Data Disclosure• Do not leave the unit or SD memory card in alocation where it can be accessed or removedwithout authorization.• Store backups in a secure location.• Do not store sensitive personal information in theunit.• In the following situations, make a record ofinformation stored in the phonebook, initialize theunit (see page 65), and remove the SD memorycard from the unit.– Before disposing of the unit– Before handing the unit over to a third party– Before having the unit serviced• Make sure the unit is serviced by only a certifiedtechnician.Document Version 2011/06 Operating Instructions 13Introduction