The changes are not trivial.
You have to change to uint_32 in all the places where int_16 is used (or short int) for
the carrierid, in order to avoid conversion. This implies changes to both pdb client
(kamailio pdb module) and pdb server(see utils/pdbt folder).
Also have a look on the comunication protocol between pdb server<->client (see
utils/pdbt/docs/network_protocol.txt)
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https://github.com/kamailio/kamailio/issues/433#issuecomment-162857599