The Q.296 1 -series Recommendations covers the support of additional traffic parameters for the Broadband Integrated Services Digital Network (B-ISDN) at the TB reference point or coincident Sg and TB reference point as defined in Recommendation 1.413 [i] by means of the Digital Subscriber Signalling System No. 2 (DSS2). This Recommendation defines the DSS2 protocol procedures, formats and functions needed to support the identified ATM traffic-related additional capabilities. This Recommendation is part of the DSS2 family of ITU-T Recommendations and specifies extensions to Recommendation 4.293 1. It does not repeat states, information elements, messages and procedures contained therein, but only specifies extensions related to additional traffic parameter indications. This Recommendation defines the signalling capabilities to support the cell delay variation tolerance (CDVT) indications at call/connection establishment time for Peak Cell Rate with CLP = O + 1, for the Sustainable Cell Rate with CLP = O + 1, for the Sustainable Cell Rate with CLP = O and for the Resource Management peak cell rate, consistently with the traffic management features and requirements defined in Recommendation 1.371 [4].