The CUG index is a parameter used by the calling
user to select a particular CUG when originating
a call. The index is also used by the network to
indicate to the called user the CUG from which
an incoming call has originated. This index has
only local significance.
Each 'cwaCugIndex' assigned to an ATM address must be
unique for this ATM address. For each 'cwaCugIndex'
must have one corresponding cwaInterLockCode
assigned.