This document specifies how signaling and selection processes for Pseudowire (PW) Virtual Circuit Connectivity Verification (VCCV) are modified to ensure backward compatibility and allow use of proactive Connectivity Verification (CV)@ Continuity Check (CC)@ and Remote Defect Indication (RDI) over MPLS Transport Profile (MPLS-TP) PWs. This document introduces four new CV types and@ to accommodate them@ a new VCCV Extended CV parameter for PW Interface Parameters Sub-TLV is defined.