MTP: Message Transfer Part level 2 and 3
From Network Dictionary Wiki
Message Transfer Part (MTP), a protocol in the SS7/C7 protocol suite, transfers signal messages and performs associated functions, such as error control and signaling link security. Message Transfer Part (MTP) also provides reliable routing within a network. MTP has two parts, MTP level 2 (MTP2) and level 3 (MTP3), that perform functions at the layers 2 and 3 respectively of the OSI 7 layers model.
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