This object is used to close all existing CDRs, transfer them
to the CG and open new partial CDRs for any existing PDP
contexts.
closeCdr - close all existing CDRs.
canCloseCdr - CDRs can be closed. This object can be set
to 'closeCdr' only when it is in 'canCloseCdr' state.
cannotCloseCdr - CDRs cannot be closed.
closingCdr - CDRs are being closed.