This ITU-T Recommendation defines the operation of the Digital Subscriber Signalling System No. 2 (DSS2) for the handling of the Connection characteristics modification feature that may be supported, as a network option, at the TB or at the coincident SB and TB reference point of the User-to-Network Interface of the Broadband Integrated Services Digital Network (B-ISDN). This edition of ITU-T Recommendation Q.2963.1 has been prepared to align the inconsistencies in ITU-T Recommendation Q.2963.1 (07/96), and to be consistent with ITU-T Recommendation Q.2931 by which the encoding of the Broadband report type information element is aligned in conjunction with Amendment 4/Q.2931.