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==Protocol classes==
SCCP provides 5 classes of protocol to its applications:
* '''Class 0''': Basic connectionless.
* '''Class 1''': Sequenced connectionless.
* '''Class 2''': Basic connection-oriented.
* '''Class 3''': Flow control connection oriented.
* '''Class 4''': Error recovery and flow control connection oriented.
The connectionless protocol classes provide the capabilities needed to transfer one Network Service Data Unit (NSDU) in the "data" field of an XUDT, LUDT or UDT message. When one connectionless message is not sufficient to convey the user data contained in one NSDU, a segmenting/reassembly function for protocol classes 0 and 1 is provided. In this case, the SCCP at the originating node or in a relay node provides segmentation of the information into multiple segments prior to transfer in the "data" field of XUDT (or as a network option LUDT) messages. At the destination node, the NSDU is reassembled.
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