This standard defines the stage one of the Call Hold (HOLD) supplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators. Stage one is an overall service description from the user's point of view (see CCITT Recommendation I.130 [1]), but does not deal with the details of the human interface itself. This standard defines the interworking requirements of private ISDNs with the public ISDN.
PUBLISHED
SSH ETS 300 139:1992 ed.1
60.60
Standard published
18 qer 2024