Flying Voice Technology IP542N - Trouble Shooting; No Operation after Power On; No Dial Tone; Can not Make a Call

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8 Trouble Shooting
This section provides solutions to problems that can occur during the installation and operation of the IP phone. Read the following
descriptions if you are having problems.
8.1 No Operation after Power On
Solution:
Check if the power adapter is properly connected.
If applicable, check if the PoE (Power over Ethernet) switch behind the IP phone is set correctly.
8.2 No Dial Tone
Solution:
Check if the handset cord is properly connected.
8.3 Can not Make a Call
Solution:
Check the status of your SIP registration status or contact your administrator, supplier, or ITSP for more information or assistance.
8.4 Can not Receive Any Phone Call
Solution:
Check the status of your SIP registration status, or contact your administrator, supplier, or ITSP for more information or assistance.
8.5 No Voice during an Active Call
Solution:
Check if the servers support the current audio codec type, or contact your administrator, supplier, or ITSP for more information or