A Cisco IP phone fails to register with the Cisco CallManager. Which choice should be checked first to isolate the issue

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answerhappygod
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A Cisco IP phone fails to register with the Cisco CallManager. Which choice should be checked first to isolate the issue

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A Cisco IP phone fails to register with the Cisco CallManager. Which choice should be checked first to isolate the issue?

A. Cisco Discovery Protocol is enabled on the switch.
B. The phone generates dhcp request packets.
C. The phone generates TFTP request packets.
D. Delete and re-create the phone.
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