How does wireshark parse MMS protocol

problem description

Ladies and Gentlemen, I would like to ask how Wireshark recognizes the MMS protocol.

the platform version of the problem and what methods you have tried

for example, in this packet, there is no relevant field indicating the upper layer protocol in the TPKT protocol.
how does Wireshark do it?

Thank you!

Wireshark
Apr.15,2022

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b981f5-2f0f3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b981f5-2f0f3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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