We are trying to configure a port on a 4400 for a Nortel IP Phone, when we set the port to untagged it works fne but as soon as we set the port to tagged it doesn't work. We've tried all sorts of different combinations but can't get it to work. We've checked all the uplinks and made sure they're all tagged with VLAN 2 but no joy.
It's not a DHCP issue as the phone works fine in a tagged vlan on a Cisco 2960.
Any help would be much appreciated.