The SuperStack 3 NBX Call Processor can support up to 72 auto-attendant ports, 1, 000 voice mailboxes, and 400 hours of message storage, making it ideal for the demands of growing businesses. 3Com SuperStack 3 NBX V5000 Call Processors range from 250-device capacity single-power supply and dual-redundant power supply to a dual-redundant power supply, 750-device unit, all 3 offering resilient 10/100 uplink ports, universal AC power connections, and simple Web browser-based administration.