I just tested with uac_req_send() and the Via is the advertised address. Internally, it uses the same function exposed by tm module to send requests like for uac remote registrations, respectively the tmb.t_request(). So it could be something specific for your config. Run kamailio with debug=3 in configuration file and grab all the log/debug messages printed from start till registrations are sent (do it for 1-2 uac registration records). Along with them, grab the pcap file of the sip traffic on the network. Attach the two files here for troubleshooting.

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