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](https://www.rfc-editor.org/rfc/rfc4168)], also provide this 
> benefit.

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