| 1976 | CCITT | X.25 Standard Ratified | |
| Nov. 1988 |
CCITT | I.122 | Framework for providing additional packet mode bearer services, Melbourne |
| I.211 | ISDN Bearer Services and Teleservices (I.212) | ||
| I.310 | ISDN Network | ||
| I.320 | ISDN Reference Model | ||
| I.330 | ISDN Numbering and addressing | ||
| Q.921 | ISDN user-network interface - Data link layer specification, Melbourne | ||
| Q.922 | ISDN Data Link for Frame Relay (LAP-F) | ||
| Q.931 | ISDN user-network interface - Layer 3 specification for basic call control, Melbourne | ||
| 1991 | Gang of Four forms "Frame Relay Forum" | ||
| 1993 | RFC1549 | PPP in HDLC framing proposed | |
| 1996 | ITU | H.323 |
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