Go back to 642-445 - Cisco IP Telephony for Release 5.x

Question :-

What is the purpose of using device pools?
to provide all the IP phone parameters required for auto-registration
to consolidate the dial plan for a set of IP phones in the same location
to provide an easily modified set of system parameters for the Cisco Unified CallManager server and endpoints
to provide a convenient way to define a set of common characteristics that can be assigned to devices

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