Which configuration causes PSTN users to experience a fail tone for every other call when trying to reach a particular number on Cisco Unified CME?

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Which configuration causes PSTN users to experience a fail tone for every other call when trying to reach a particular number on Cisco Unified CME?
A . ephone-dn is not assigned to the ephone.
B . Duplicate ephone-dn is not assigned to the ephone.
C . ephone is not registered.
D . ephone does not exist for the ephone-dn.

Answer: B