Recommendation ITU‑T G.7713/Y.1704 provides the requirements for the distributed call and connection management for both the user network interface (UNI) and the network node interface (NNI). The requirements in this Recommendation specify the communications across interfaces to effect automated call operations and connection operations. Items covered in this Recommendation include: – attribute specifications; – message specifications; – signal flows; – management of DCM. This Recommendation does not cover any aspects related to routing or automatic discovery. This Amendment adds the hybrid call and connection management operation procedures in the SDN and ASON hybrid control architecture.