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| Author | ITU |
|---|---|
| Editor | ITU |
| Document type | Standard |
| Format | File |
| ICS | 33.040.30 : Switching and signalling systems
|
| Number of pages | 5 |
| Replace | ITU-T M.21 (1988) |
| Year | 1990 |
| Document history | ITU-T M.21 (1992-10) |
| Country | Switzerland |
| Keyword | CCITT M.21;ITU-T 21;21;ITU-T M.21 |