ITU-T Rec. Q.772 (1988)
1 General
2 Transaction portion
2.1 Message type
2.2 Transaction IDs
2.3 P-Abort Cause
2.4 User abort information
2.5 Component portion
3 Component Portion
3.1 Component type
3.2 Invoke ID
3.3 Linked ID
3.4 Operation code
3.5 Set (of parameters)
3.6 Sequence (of parameters)
3.7 Error code
3.8 Problem code