I have recently had installed a few Siemens Openstage 15 HFA IP phones for our Siemens phone system. They work perfectly with our Netgear GS748T layer 3 switch and basic DLink switch. I cannot however get them to work with our HP1910 8 port POE switch, they will not pick up a DHCP address from our Win2008 server.
The HP1910 is connected via fibre to the Netgear.
I have connected a laptop to the HP switch and can get a DHCP address without a problem.
Does anyone have any ideas why the IP Phones refuse to pick up a DHCP address (or are blocked) by the HP1910?