I have connected a new SPA9000 to a new SPA400. I did this as per Cisco's instructions, i.e. both are connected to a dedicated network switch (i.e. not on the office data network).
The SPA9000 is connected through it's LAN port (though I have now read in this forum that it is actually better to use the WAN port - I will try this tomorrow).
I am accessing the SPA9000 config using a PC on the WAN port, and that works fine for both the WEB UI and the Wizard.
The problem I am having is that the devices connected to the network switch - the SPA400 and the VoIP habdsets - do not receive an IP address even though they are set to DHCP by default.
To test, I connected the handsets and SPA400 to the office data network, and they happliy obtained an IP address from our DHCP server.
So it looks as if the DHCP server on SPA9000 is not giving-out IP leases... even though the DHCP server option on it is set to 'Yes', starting at 192.168.0.2.
We don't recommend putting the phones and spa400 on the lan side of the spa9000 (in order for the spa9000 to give out ip addresses). The recommendation is use another router to give out the ip addresses so that you can keep the phones and the spa400 with the wan side of the spa9000. The lan side of the spa9000 should be used only for a pc to access the spa9000 config.