Message type 2.1 F 1
Cause indicators 3.12 V 3-?
Redirection information (national use) 3.45 O 3-4
Redirection number (national use) (Note) 3.46 O 5-?
Access transport 3.3 O 3-?
Signalling point code (national use) 3.50 O 4
User-to-user information 3.61 O 3-131
Automatic congestion level 3.4 O 3
Network specific facility (national use) 3.36 O 4-?
Access delivery information 3.2 O 3
Parameter compatibility information 3.41 O 4-?
User-to-user indicators 3.60 O 3
Display information 3.77 O 3-?
Remote operations (national use) 3.48 O 8-?
HTR information 3.89 O 4-?
Redirect counter (national use) 3.97 O 3
Redirect backward information (national use) 3.100 O 3-?
End of optional parameters 3.20 O 1