I tried SMS over IMS on my smartphones with docker_open5gs (using Kamailio and Open5GS), and the multibyte message (Japanese) was garbled at the recipient smartphone.

docker_open5gs URL: https://github.com/herlesupreeth/docker_open5gs

Also, docker_open5gs uses Kamailio v5.3.

I would be very glad if you could tell me about Kamailio's support for multi-byte SMS.

Best regards,

--Shigeru