Karel NT62I Technical Reference And User's Manual - page 25
Manual is about: IP SIP Telephone set
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NT62I Technical Reference and User Guide
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If server can not get user information correctly, NT62I will send REGISTER
message to server in regular intervals. If server can not identify user, NT62I
shows “Registration Failure” on the screen.
If telephone registers to the server normally, telephone can communicate with
predefined analog and digital telephones and use all services that server
supports.