Tele-Communication (Telecom) Terms Glossary and Dictionary
MTP2: Message Transfer Part Level 2
Message Transfer Part Level 2 (MTP2) is the signalling protocol at the data link layer of SS7/C7 protocol suite. MTP2 provides error detection, sequence checking, and initiates retransmission in case of erroneous reception of messages. MTP Level 2 uses packets called signal units to transmit SS7 messages. There are three types of signal units: Fill-in Signal Unit (FISU), Link Status Signal Unit (LSSU), Message Signal Unit (MSU).