https://app.knowbase.one/vault/rfc/docid/5089
RFC4666: Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA)
Network Working Group K. Morneault, Ed. Request for Comments: 4666 Cisco Systems Obsoletes: 3332 J. Pastor-Balbas, Ed. Category: Standards Track Ericsson ...