Subscription Option - Direct Call
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 | . | . | . | . | . | | #