This Recommendation contains the informal text descriptions of the functions MRVT (MTP Routing Verification Test), SRVT (SCCP Routing Verification Test) and CVT (Circuit Validation Test), as well as the definition of the OMASE-User process containing the logic of these functions at a node. The MRVT is a function started at a node by management action (defined in the MRVT managed object of Recommendation Q.751.1), which uses the SS No. 7 network to perform an MTP routing audit. The SRVT is an analogous function for the SCCP. The CVT ensures consistency of data and physical connection for the signalling points at each end of an ISDN User Part or Telephony User Part trunk circuit. The main revisions to the 1993 version of this Recommendation are: a) enhancement of the compatibility rules and definition of a mechanism to transfer unrecognized parameters transparently; b) an extension to the MRVT to provide route priority information; c) addition of an explicit check on the maximum allowed number of MRV Tests, and SRV Tests, at a node at any time; d) revision of the MRVT text; e) addition of an ASN.1 module and mapping of primitives to allow management control.