$leaseBegin : \CallFire\Common\Resource\date
$leaseEnd : \CallFire\Common\Resource\date
$autoRenew : boolean
getLeaseBegin()
setLeaseBegin( $leaseBegin)
getLeaseEnd()
setLeaseEnd( $leaseEnd)
getAutoRenew()
setAutoRenew( $autoRenew)
ns()