tls_dump_cert_info(): tls_connect: server certificate issuer:/C=US/O=Microsoft Corporation/CN=Microsoft RSA TLS CA 01

THis is not sectigo signed - is my guess. It’s the other sides cert that Kamailio can’t verify. You need to add that CA cert to the Kamailio CA store.

/O

On 5 May 2022, at 14:09, Володимир Іванець <volodyaivanets@gmail.com> wrote:

tls_dump_cert_info(): tls_connect: server certificate issuer:/C=US/O=Microsoft Corporation/CN=Microsoft RSA TLS CA 01