Integrated Services Digital Network (ISDN);Supplementary service interactions;Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specification (Endorsed by Asociación Española de Normalización in April of 2022.)
Integrated Services Digital Network (ISDN);Supplementary service interactions;Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specification (Endorsed by Asociación Española de Normalización in April of 2022.)
