<p></p>
<p>According to <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/kamailio/kamailio/commit/116daef9b55d82a016d1fd3e3d877a2468c55d1a/hovercard" href="https://github.com/kamailio/kamailio/commit/116daef9b55d82a016d1fd3e3d877a2468c55d1a"><tt>116daef</tt></a> commit description</p>
<blockquote>
<p>modules/msrp: Use "msrps://" URIs for the server when TLS is<br>
loaded. TLS is mandatory for MSRP relays.</p>
</blockquote>
<p>According <a href="https://datatracker.ietf.org/doc/html/rfc4976#section-9.2" rel="nofollow">rfc4976#section-9.2</a></p>
<blockquote>
<p>9.2.  Using TLS<br>
TLS is used to authenticate relays to senders and to provide<br>
integrity and confidentiality for the headers being transported.<br>
MSRP clients and relays MUST implement TLS.</p>
</blockquote>
<p>Yes, according to RTF proxy must support TLS, but this does not dictate the TLS usage on the client side.<br>
I think the client a free to use TCP only.<br>
I will check RFC restrictions for the client.</p>

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