Why does wireshark decode my RTP data as "RTP Events"?

[Nan Xiao <xiaonan830818 () gmail com>]

Hi Community,

Greetings from me!

I have a RTP pcap file, and after decoding it as "RTP" protocol, it
displays as "RTP Events". I guess there should be some values which hint
wireshark to decode it as "RTP Events", but I can't figure it out. Anyone
can give some clues? Thanks very much in advance!

P.S., The pacp file and screenshot on my wireshark are attached.
Best Regards
Nan Xiao

Attachment: rtp.pcap
Description:

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