ASP:
• RFC3057: ISDN Q.921-User Adaptation Layer.
• RFC3331: Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) - User Adaptation Layer.
• RFC3332: Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA).
• RFC3868: Signalling Connection Control Part User Adaptation Layer (SUA).
• RFC4233: Integrated Services Digital Network (ISDN) Q.921-User Adaptation Layer.
• RFC4666: Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA).