Refer to the exhibit.
An administrator is attempting to register a SIP phone to a Cisco UCM but the registration is failing.
The IP address of the SIP Phone is 10.117.34.222 and the IP address of the Cisco UCM is 10.0.101.10
Pings from the SIP phone to the Cisco UCM are successful.
What is the cause of this issue and how should it be resolved?
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A. B. C. D.D.