RTP packets generally carry data, and generally you need to know its carrying link to capture it accurately. For example, if the corresponding control signaling is SIP signaling, then you should find the media port in SIP signaling, so you can capture the RTP packet on this media link by directly setting the "port number" as the filtering condition. If you don't know the port number of the media carrying the link, when using wireshark, don't set the filtering conditions, grab all the packets on this network card, and then filter out the RTP packets. But when the amount of data is very large, this will lead to software jamming. It is recommended to set up wireshark to capture data packets and save them directly as files instead of displaying them.