@joelbax: I think RFC3261 mention the deprecation of transport=tls for sips scheme (ie., end to end secure transmission), but it is defined in the grammar (e.g., for hop-by-hop tls usage). See RFC3261 page 223:

transport-param   =  "transport="
                     ( "udp" / "tcp" / "sctp" / "tls"
                     / other-transport)

https://datatracker.ietf.org/doc/html/rfc3261

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