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。