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TCP and UDP protocols are dissected based on port or heuristics. In your case you can do "Decode as" and select RTP to dissect the packet as RTP. You can also activate the heuristic for RTP. Heuristic = guessing the protocol by looking at packet data. The RTP heuristic is weak meaning it often makes mistakes and labels packt as RTP even if they are not. In case of RTP Wireshark also looks at control signaling if present (like SIP and SDP) if present and dissects the traffic on the port and IP combination as RTP.
