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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.
Check if the handset cord is properly connected.
Check the status of your SIP registration status or contact your administrator, supplier, or ITSP for more information or assistance.
Check the status of your SIP registration status, or contact your administrator, supplier, or ITSP for more information or assistance.
Check if the servers support the current audio codec type, or contact your administrator, supplier, or ITSP for more information or assistance.
Check if the Ethernet cable is properly connected.
Check if the URL is right; the format of URL is: http:// the Internet port IP address.
Check if your firewall/NAT settings are correct.
Check if the version of IE is IE8, or use other browsers such as Firefox, or contact your administrator, supplier, or ITSP for more information or assistance.
Default password of website and menu is null.
If user changes the password and then forget it, or you cannot access to the configuration website or the menu items that need a password.
Solution:
Factory default: press the Menu button and choose 16Factory Default and then a notice will appear, choose OK by using the corresponding softkey button.
If you choose factory default, you will return the phone to the original factory settings and will erase ALL current settings, including the directory and call logs.
