Which of the following statements is correct when discussing how the Cisco CallManager works with IP Phone registration? (Choose all that apply.)

A.
On initial configuration, an IP phone is assigned a DSNP listing, which it loses when moved.

B.
On initial configuration, an IP phone is assigned a directory number (DN), which it loses when moved

C.
On initial configuration, an IP phone is assigned a DSNP, which it maintains wherever it resides

D.
On initial configuration, an IP phone is assigned a directory number (DN)k, which it maintains wherever it resides.