A.Add four additional park-slots under the existing ephone-dn for extension 102.
B.Add four additional ephone-dns and configure each with number 102 and a park-slot.
C.Add four additional ephone-dns with unique numbers and set call-forward busy to roll to the next available park extension.
D.Add four additional ephone-dns with unique numbers and configure a hunt group to roll to the next available park extension.