I'm a student of CCVP track and in the process of checking lab requirements for setting up Call Manager over the LAN. I've got all things setup, but ive this question that do I need a 3550 switches for POE. I think I can just use a normal 2950 switch and get external power adapter for my phone. It should work but what are the feature I may miss ? Does 2950 switch support auxiliary VLAN or switchport voice vlan feature ?