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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.30 : Switching and signalling systems
|
| Number of pages | 36 |
| Replace | ITU-T Q.543 (1988) |
| Year | 1990 |
| Document history | ITU-T Q.543 (1993-03) |
| Country | Switzerland |
| Keyword | CCITT Q.543;ITU-T 543;543;ITU-T Q.543 |