LAn/Bridge not working

Hello,

I have a bit of a curious problem, LAN/Bridge is not working. At least in some circumstances.

I plug in LAN at the "Internet" port and the PC at the "PC" port.

1) PC behind the phone gets IP address from DHCP: This works on one PC and does not on three others

2) PC behind the phone has a fixed IP address: PC has network access, while phone says no network connection.

I tried this on multiple PCs (4) with multiple phones (3, all T48G).

Any ideas?

thanks
Daniel