Integrated Services Digital Network (ISDN);Application of the ISDN User Part (ISUP) of CCITT Signalling System No.7 for international ISDN interconnections (ISUP version 1) (Endorsed by Asociación Española de Normalización in March of 2022.)
| AENOR | |
|---|---|
| Product Category | Standards and Technical Documents |
| Product Name | UNE-ETS 300121 Ed1 |
