SSH ETS 300 057:1992

Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service; Functional capabilities and information flows

Scope

This standard defines the stage two of the Call Waiting (CW) supplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators. Stage two identifies the functional capabilities and the information flows needed to support the stage 1 service description. The stage two description also identifies user operations not directly associated with a call (see CCITT Recommendation I.130 [1]). This standard is specified according to the methodology specified in CCITT Recommendation Q.65 [2].