What system are these installed on? is your tftp server up? If these are new phones, they will no doubt need to be updated....and if the tftp server IP isnt set, they wont know where to get the files from.
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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.
To answer your question: Your phone has lost connection to the VOIP network. These types of phones use DHCP to assign an IP address to themselves from your VOIP network, usually by means of a switch or router. When they lose connection to this switch or router, they cannot communicate with the VOIP network and load their network environment, called PXE. This in turn loads the phone. Try replacing the patch cable on the phone between the phone and the wall. If that doesn't resolve your issue call your Telcom Specialist who installed the VOIP Network. He will need to test the phone, switch, Firewall, and VLAN to make sure the phone hasn't died or his configuration hasn't been hosed in the router or VLAN. He may also need to reset his VOIP box.
It means that your DHCP server on your network is missing the options to allow your phone to boot up. After a month (time on this message), I hope you've managed to get the issue resolved. If not, I hope you've fired your IT support team - they should be able to get this resolved quickly.
If both phones are showing the same symptoms then it probably means that your DHCP server is down or not configured properly. If the phones are on a separate VLAN and you have recently upgraded or replaced your network switch then it could be misconfigured as well - specifically it may require you to configure a DHCP helper address.
You didn't provide any information about your network which is ALWAYS required to provide any type of help, not to mention a solution.
"Failed to get boot parameters via DHCP, xxx seconds until reboot" simply means that the computer isn't getting an IP address from your router. Setting up your router is another entirely separate topic.
This is pretty simple though, one of three things is happening:
1. Your router is not properly configured to provide DHCP to the phone.
2. Your network cable is bad.
3. Your phone is bad (most likely the RJ45 port since the phone seems to work otherwise).
You can check for bad ports or cables by checking the port status within the router. If the port is lit up, most likely the cable and phone port are fine. This is not 100% though, replacing the cable should always be a consideration even with a lit port.
Try to manually reset the phone - **#"Settings" (this will unlock the configuration) + Network + menu under number "33" - erase the configuration. Then the phone configuration will be erased. Also you can manually set IP address and TFTP server