Integrated Services Digital Network (ISDN) - Explicit Call Transfer (ECT) supplementary service - Functional capabilities and information flows; English version ETS 300368:1995
Integrated Services Digital Network (ISDN) - Explicit Call Transfer (ECT) supplementary service - Functional capabilities and information flows (Endorsement of the English version EN 300368 V 1.2.2 (1998-12) as German standard)— 1 стр.
Integrated Services Digital Network (ISDN) - Explicit Call Transfer (ECT) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification
