resources/metadata/256/formats.csv

Id        ; National      ; International ; Comment
fixed_2/7 ; "#XX XXXXXXX" ; "XX XXXXXXX"  ; "2-digit area codes"
fixed_4/5 ; "#XXXX XXXXX" ; "XXXX XXXXX"  ; "4-digit area codes"
fmt_3/6   ; "#XXX XXXXXX" ; "XXX XXXXXX"  ; "Fixed and mobile format."