make sure you run the command "ip license-server" on the G450, and then do a "copy running-config startup-config" so it gets saved on the next reboot/powerdown.
Typically you would use the Corporate LAN IP address that the S8800 is on... I would NOT use CN-A, it is usually better to use the Corporate LAN interface, so you can also get to the G450 and the client also needs this capability to use the "VAL Manager" if they want the ability to FTP files to/from the G450. CN-A is usually only used for dedicated IPSI's, gateways belong on the corporate LAN.
Mitch
AVAYA Certified Expert