Partition and CSS are calling privileges control elements which are use to block or allow user by making certain calls.
Partition
A partition is group is any dialable patterns with same accessibility.Any dilable entity can be added in partition.By default all numbers get <none> partition.
CSS
Calling Search Space is ordered list of partitions.When calling side CSS contains called side partition then call is connected.All the devices by default get <none> CSS.You can not make changes in <none> CSS.By default at the end of each CSS there is a <none> partition,which is invisible.
