Integrated Services Digital Network (ISDN);Closed User Group (CUG) supplementary service;Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specification (Endorsed by Asociación Española de Normalización in March of 2022.)
| AENOR | |
|---|---|
| Product Category | Standards and Technical Documents |
| Product Name | UNE-ETS 300138-1 Ed1 |
