topoh breaks SIPS with PJSIP if PJMEDIA_SRTP_MANDATORY is set

Hi

I have a question related to topoh. We are running Kamailio in version
6.0.2 with topoh enabled. The PJSIP based softphone is unable to establish
a call with SIPS and SRTP if we use "PJMEDIA_SRTP_MANDATORY" in PJSIP.

PJSIP complains about "Secure dialog requires SIPS scheme in Contact and
Record-Route headers, ending the session". The other side is sending
"Contact: <sips:[email protected]:59686;transport=tls>", but topoh
modifies the contact header to "Contact:
<sip:127.0.0.8;line=sr-avdFaQDvhUxGrqtxhqxThq-ZnUy6nUzGrQDZmqa1rUf6a0JTaLt4aoyV2EGQ>"
without sips scheme and without transport=tls. PJSIP then refuses to
establish the call and sends immediately a BYE.

If topoh is disabled, the call is successfully established.

Is it somehow possible to tell topoh to keep the scheme or transport=tls if
the other side provided it?

Thanks for your help
Best regards
Mathias

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