The MTP Level 2 working with MTP Level 1, the data link layer, is responsible for the reliable error-free point-to point transport of signaling messages between two network signaling points (SPs).

• mtp第2级同mtp第1级，数据链路层一起发挥作用，负责在两个网络信令点(sp)之间进行可靠的、无错的点到点的信令消息传输。