MTP Level 1 is described in ITU-T Recommendation Q.702, and provides the Signalling Data Link functional level for narrowband signalling links. The part of layer 3 of the OSI model that MTP does not provide, is provided by SCCP or other Level 4 parts (MTP users). Instead, MTP provides the functionality of layers 1, 2 and part of layer 3 in the OSI model. There is no one-to-one mapping of MTP Levels 1 through 3 onto the OSI model. MTP and SCCP are together referred to as the Network Service Part (NSP). MTP Level 3 is sometimes abbreviated MTP3 MTP Level 2, MTP2. Level 1 through Level 3 comprise the MTP, and Level 4 the MTP user. The SS7 stack can be separated into four functional levels: 1.3 Signalling Network Functional Level.1.1 Signalling Data Link Functional Level.
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