INE CCIE Voice Rack R2 HWIC-4ESW vs Cisco 3550 POE

I was wondering in the case of the building my own CCIE voice rack for R2 it says that a HWIC-4ESW and an ILMP-4 is needed. Instead of these can I just get a 3550 switch to do the switching instead. Or is there a special use needed for this HWIC-4ESW?




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