Log in to a800 with telnet, from quintum> prompt type
config unit 1
ip xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx = ip address).
If you need to change the subnet and def gateway, do the following;
From Config# prompt type
Then restart tenor.
I also suggest that you go to quintum’s web site, go under support and download the CLI command reference guide for the a800 as this command and all others are listed there.