Recommendation Q.2961.5 belongs to the DSS2 family of ITU-T Recommendations and specifies extensions to Recommendations Q.2931, Q.2961.1, Q.2961.2, Q.2961.3, Q.2961.4, Q.2961.6 and Q.2934 to specify the additional DSS2 traffic-related parameters, formats, protocol procedures and functions needed to support the user-to-network and network-to-user indication of Cell Delay Variation Tolerances at call/connection establishment time, consistently with the traffic management requirements and features defined in Recommendation I.371.