CCITT (1988) for further study
| X.2 LEVEL 3 PER USER SUBSCRIPTION | X.2 (1984) | UK(a) | UK(b) | interworking | ||
| OPTIONS | REF CLASS | now | now | R5a | R5b | R6 |
| Direct call......................... | 1.23 FS | . | . | . | . | . |
| Direct call.........................| 1.23 FS | . | . | . | . | . | | #
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