This should apply not only to UDP and SCTP, but also to WebSockets: https://www.rfc-editor.org/rfc/rfc7118.html#section-5
Because the WebSocket transport preserves message boundaries, the use of the Content-Length header in SIP messages is not necessary when they are transported using the WebSocket subprotocol.
This simplifies the parsing of SIP messages for both clients and servers. There is no need to establish message boundaries using Content-Length headers between messages. Other SIP transports, such as UDP and the Stream Control Transmission Protocol (SCTP) [RFC4168], also provide this benefit.
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