Hello Olle!

Thank you for the hint! I checked my test server where the connection was working before and now I see the same problem. Looks like Microsoft could update certificate on their side. Will try to find appropriate root and intermediate certificates.

Thanks a lot!

чт, 5 трав. 2022 р. о 17:52 Olle E. Johansson <oej@edvina.net> пише:

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

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