I have a strange problem.
I have Nortel IP Phones, the 1120E Model, and I have configured DHCP to provide Voice VLAN information, and the switches have this configuration on the ports:
switchport access vlan 11
switchport mode access
switchport voice vlan 450
This works fine on C2960's, C3560's and even C2950's, but not on my C3550 switches.
I have upgraded the C3550's to the latest firmware, but no.
Are there som tricks to get this working on C3550. I am completely out of ideas right now.