Nancy,
If you mean to change the IP address where the A800 sends the call to, this is typically done in the config be area. If you have more than one sroute, you need to go to the index number that identifies the route to change. If you only have the one, you can go to the config be sroute 1# and type print to see the current settings. You can change the ip address by typing “callsig xxx.xxx.xxx.xxx” then do not forget to submit your changes.