This Recommendation contains a set of detailed tests of Signalling System No. 7, MTP level 3 protocol. These tests intend to validate the protocol specified in ITU-T Recs. Q.704 and Q.707. The level 3 performance aspects specified in ITU-T Rec. Q.706 are also partly checked whenever possible. This Recommendation conforms to ITU-T Rec. Q.780. However, in addition to the objectives and guidelines of the latter Recommendation, other general principles specific to level 3 tests are presented.