以下信息刪除或恢復缺省值：
User configuration settings—Reset to default values
Network configuration settings—Reset to default values
Locale information—Reset to default values
Phone application—Erased (phone recovers by loading the appropriate default load file (term62.default.loads, term61.default.loads, term42.default.loads, or term41.defaults.loads) depending on the phone model)
確保以下前提條件
The phone must be on a DHCP-enabled network.
A valid TFTP server must be set in DHCP option 150 or option 66 on the DHCP server.
The default load file for your phone model and the files specified in that file should be available on the TFTP server that is specified by the DHCP packet.
執行以下步驟
Procedure
Step 1 Unplug the power cable from the phone and then plug it back in.
The phone begins its power-up cycle.
Step 2 While the phone is powering up, and before the Speaker button flashes on and off,
Continue to hold # until each line button flashes on and off in sequence in amber.
Step 3 Release # and press 123456789*0#.
You can press a key twice in a row, but if you press the keys out of sequence, the factory reset will not take place.
After you press these keys, the line buttons on the phone flash red, and the phone goes through the factory reset process.
Do not power down the phone until it completes the factory reset process, and the main screen appears.