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https://datatracker.ietf.org/doc/html/rfc4666
RFC 4666 - Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA)
Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA) (RFC 4666, )