I have an implementation of both PAP2T ATA's and SPA504G's on the same network. The PAP2T's are working absolutely fine, whereas the SPA504G's hang at "checking DNS" screen on boot. I have traced this problem to the fact that my default gateway is on a different subnet than the IP of the phone... yet the PAP2T's are working fine. My PBX box is located offsite.
My phone network config is:-
(IP's changed for security)
Any ideas? Could this be a firmware issue as DHCP is issuing the IP information and the PAP2Ts are working fine, and if I plug a computer into that connection, it also works fine so the problem seems to be just with the SPA504Gs.