https://bips.xyz/60
BIP60 - Fixed Length "version" Message (Relay-Transactions Field)
fixed lengthmessage relayversiontransactionsfield
https://3glteinfo.com/messages/5g/nas/relay-key-reject/
5G NAS - Relay Key Reject | NAS Message
Relay Key Reject is the NAS message the network sends when the relay key request cannot be accepted and the relay-related key procedure must stop or take a...
nasrelaykeyrejectmessage