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The document defines the stage 1 description for the virtual card calling service in the ISDN ad PSTN.
| Author | DIN |
|---|---|
| Editor | DIN |
| Document type | Standard |
| Format | File |
| ICS | 33.040.35 : Telephone networks
33.080 : Integrated Services Digital Network (ISDN) |
| Number of pages | 24 |
| Cross references | ETS 300711 (1997-03), IDT |
| Year | 1990 |
| Document history | |
| Country | Germany |
| Keyword | 300711 |