Integrated Services Digital Network (ISDN);Subaddressing (SUB) supplementary service;Digital Subscriber Signalling System No. one (DSS1) protocol;Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsed by Asociación Española de Normalización in February of 2022.)
Integrated Services Digital Network (ISDN);Subaddressing (SUB) supplementary service;Digital Subscriber Signalling System No. one (DSS1) protocol;Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsed by Asociación Española de Normalización in February of 2022.)
