Message type 2.1 F 1
Information indicators (national use) 3.28 F 2
Calling party's category 3.11 O 3
Calling party number (Note) 3.10 O 4-?
Call reference (national use) 3.8 O 7
Connection request 3.17 O 7-9
Parameter compatibility information 3.41 O 4-?
Network specific facility 3.36 O 4-?
End of optional parameters 3.20 O 1
