The seller delivers the goods to the carrier nominated by him but the seller additionally must pay the cost of carriage required to bring the goods to a named destination. The buyer bears risks of loss of and damage to the goods in addition to any costs incurred after the goods have been delivered.
If more than one carrier is used then the risk passes to the buyer once the goods have been delivered by the first carrier.
CPT requires the seller to obtain clearance of the goods for export.
As you can see, the obligations of the seller are greater than with CFR and CIF. Now check out CIP!