/usr/share/kamailio/db_berkeley/kamailio/carrierroute is in kamailio-berkeley-modules 4.0.4-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | METADATA_COLUMNS
id(int) carrier(int) domain(int) scan_prefix(str) flags(int) mask(int) prob(double) strip(int) rewrite_host(str) rewrite_prefix(str) rewrite_suffix(str) description(str)
METADATA_KEY
1 2
METADATA_READONLY
0
METADATA_LOGFLAGS
0
METADATA_DEFAULTS
NIL|0|0|''|0|0|0|0|''|''|''|NULL
|