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PowerPack is a software key that adds extension and auto attendant capacity and voicemail broadcast to systems:

8 IP extensions
6 remote extensions
11 auto attendants
10 voicemail broadcast groups

Multi-unit systems: Adding a PowerPack to a multi-unit system gives every unit on the network the extra extensions. However, the maximum local extensions on a 4-unit system remains 64. The 11 auto attendants and 10 voicemail broadcasts groups apply to the entire networked system.