European digital cellular telecommunications system (Phase 2);Call Waiting (CW) and Call Hold (HOLD) supplementary services;Stage 1 (GSM 02.83) (Endorsed by Asociación Española de Normalización in September of 2022.)
| AENOR | |
|---|---|
| Product Category | Standards and Technical Documents |
| Product Name | UNE-ETS 300516 Ed1 |
