> On 2 Jan 2025, at 14:54, Benoit Panizzon via sr-users <sr-users@lists.kamailio.org> wrote:
>
> Hi
>
> Quick update...
>
> I switched the CPE from TLS to TCP
>
> Now the CPE registers with sip: and ;transport=tcp
>
> The problem does not occur.
>
> I attemted to reproduce the issue with a CPE using sip: ;transport=tls
>
> The problem does not occur.
>
> I fear, something goes wrong kamailio internally if the sips: scheme is
> being used.

Well, something went wrong internally while writing the SIP RFC so the sips: scheme can’t really be implemented properly. My best defence for the authors is that they got a last minute request to add security like ldaps: and https: and they gave it a try without really implementing it beforehand.

Better to use ";transport=tls” and wait for energy in the IETF SIP wg to really focus on solving the TLS issues.

/O
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