Which protocol is used for control and session establishment for streaming media?

RTP (Real-time Transport Protocol) carries the actual audio or video media payload during a streaming session but does not handle session control or establishment - that role belongs to RTSP.

DTLS (Datagram Transport Layer Security) provides encryption and integrity for datagram-based protocols such as UDP and is used to secure RTP streams, but is not a session establishment or control protocol for streaming media.

SMB (Server Message Block) is a network file-sharing protocol used to access files and printers on a network and has no role in streaming media session control or establishment.

RTSP operates similarly to HTTP and is specifically designed to control the delivery of real-time media - it handles session establishment, play, pause, seek, and teardown commands. The actual audio or video payload is transported separately over RTP, making RTSP the dedicated control and session establishment layer for streaming media.