# Segmentation
Message type 2.1 F 1
Access transport 3.3 O 3-?
User-to-user information 3.61 O 3-131
Message compatibility information 3.33 O 3-?
Generic digits (national use) (Note 1) 3.24 O 4-?
Generic notification indicator (Note 1) 3.25 O 3
Generic number (Notes 1 and 2) 3.26 O 5-?
End of optional parameters 3.20 O 1
