Re: TLS issue

It is confirmed in their specification that they require TLS 1.2.

A hint in all this, is that incoming calls work fine from this provider, until we send a BYE. Then it fails with the same error.

We are running 6.1.2 by the way.

/M
From: Fred Posner <[email protected]>
Date: Monday, 22 June 2026 at 23:32
To: Kamailio (SER) - Users Mailing List <[email protected]>
Cc: Martin Nyström <[email protected]>
Subject: Re: [SR-Users] TLS issue

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Have you made sure they are using TLS 1.2 or higher?


Regards,

Fred Posner





> On Jun 22, 2026, at 4:56 PM, Martin Nyström via sr-users <[email protected]> wrote:
>
> ERROR: tls [tls_util.h:56]: tls_err_ret(): TLS connect:error:0A000413:SSL routines::sslv3 alert unsupported certificate (sni: unknown)
>

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