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Your phone needs an IP address in order to communicate. Normally, it asks a "host" for that IP. You need to be connected to the internet for it to connect to the normal host, and your router should be willing to give it that IP address. "DHCP" is how devices ask for and get an IP address.
when you plug it in, and the Nortel logo appears on the screen, swipe the three buttons that are under the display, with your finger, and that will get you into programming.
you will select following
Manual DHCP config? yes
enter the IP address of your system
for port #: enter: 7000
retries: enter 5
for the rest of the programming select "0" till the end
there are many different problems that can cause the IP phone re-booting on a network, apart static.
Check if there are errors being reported by the pbx.
A common cause is an IP conflict due to a DHCP problem.
Check if the rebooting phone is connecting to data VLAN and then rebooting in voice VLAN, that means that is getting the right IP, and therefore is no DHCP problem.
If the rebooting phone is booting into vlan correctly, it can still be a different phone, with a bad MAC address, getting the wrong IP , and causing a different phone to reboot. In that case you try isolating the problem by disconnecting switches one by one, and if problem stops, find the bad unit on the specific switch.
Talk to your system admin. You have a Definity system, which is too complicated for online help. The phone isnt seeing either the license server or the Phone system. There is more than likely an incorrect IP address somewhere.