Which statement is true for an ephone-dn that has no COR applied?

Which statement is true for an ephone-dn that has no COR applied?

A.
Calls can be made from this ephone-dn to all possible numbers from the local router.

B.
Calls cannot be made from this ephone-dn.

C.
Calls can be made from this ephone-dn only to another ephone-dn on the local router.

D.
Calls can be made from this ephone-dn only to external numbers.