This European Telecommunication Standard (ETS) specifies the Message Transfer Part (MTP) protocol Tester (MT) to be used as an aid when testing the MTP of Signalling System No.7. This tester applies to all MTP implementations conforming with ETS 300 008-1 [1] regardless of its date of issue, as long as they provide the equivalent of the MTP primitives, and the Service Indicator (SI) of the MT is supported.