#Pre-Release information
Message type 2.1 F 1
Message compatibility information 3.33 O 3-?
Parameter compatibility information 3.41 O 4-?
Optional forward call indicators (Note 1) 3.38 O 3
Optional backward call indicators (Note 1) 3.37 O 3
Application transport parameter (Note 2) 3.82 O 5-?
End of optional parameters 3.20 O 1