According to 116daef commit description

modules/msrp: Use "msrps://" URIs for the server when TLS is
loaded. TLS is mandatory for MSRP relays.

According rfc4976#section-9.2

9.2. Using TLS
TLS is used to authenticate relays to senders and to provide
integrity and confidentiality for the headers being transported.
MSRP clients and relays MUST implement TLS.

Yes, according to RTF proxy must support TLS, but this does not dictate the TLS usage on the client side.
I think the client a free to use TCP only.
I will check RFC restrictions for the client.

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