Recently,I found some 7912(7912G-A) will lost all of their DHCP config suddenly(include DHCP server & tftp server and gw ip),and change to Fallback mode,after restart the 7912,it will be ok.I think the network is fine since the computer connect to the ip phone is no problem.What's the problem,is in ipphone or DHCP server?
Re: 7912 Lost DHCP config & change to Fallback mode
you capture a sniffer trace off the back of the 7912. You may download a free sniffer pease install it on a laptop or PC that is
connected to the back of the 7912. Start capturing and reset the phone so you can see the process that it follows to request and accept the DHCP packets from the servers to find out if ther is any issues in getting the DHCP ip address
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...