Troubleshooting - D-Link DPH-400S User Manual

Appendix A - Troubleshooting
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.
Problem
No operation
No dial tone
LAN connection lost status
message
I cannot make a call
My IP Phone cannot receive any
phone calls
I cannot connect to the
configuration website of the IP
phone
D-Link DPH-400S(SE) User Manual

TROUBLESHOOTING

Check if the power adapter is properly connected.
Check if the Ethernet cable is properly connected.
If applicable, check if the PoE (Power over Ethernet) switch behind the IP phone is set correctly.
Check if the handset cord is properly connected.
Check if the power adapter is properly connected.
Check if the Ethernet cable is properly connected.
Check the status of your SIP registration status or contact your administrator, supplier, or ITSP for
more information or assistance.
Check if the Ethernet cable is properly connected.
Check the status of your SIP registration status, or contact your administrator, supplier, or ITSP for
more information or assistance.
Check if the Ethernet cable is properly connected.
Check the IP address of the IP phone.
Check if your firewall/NAT settings are correct.
Solution
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