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How can I differentiate RTP and SRTP packets?

Hi there,

I have 2 camera's both streaming video. One should be streaming SRTP and the other RTP.

But when I wireshark the packets, both streams (RTP packets) look the same. They both are listed as RTP (in the protocol column)

Though I get RTSP packets from the one camera, it seems to me the RTP packets are not encrypted at all. I can see the RTP fields and even the payload.

How do I know if SRTP is used? Shouldn't I see SRTP in the protocol column? I'm really confused.