Module Expr Str ImportFrom alias Assign NameStore Call NameLoad Str Call NameLoad Str Num Call NameLoad Str Call NameLoad Str
N/A N/A 
ISDN User Part (SS7 protocol stack)
 construct * N/A isup_header N/A Struct isup_header N/A Bytes routing_label 5 N/A UBInt16 cic N/A UBInt8 message_type