Signaling System No. 7 (SS7/C7) - Protocol, Architecture and Services (Full Book)
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ISDN User Adaptation (IUA)
In addition to addressing SS7 over IP, the SigTran group also addressed the backhaul of ISDN over an IP network. RFC 3057  defined the IUA, which is supplemented by an Implementer's Guide  that seamlessly supports the Q.921 user (Q.931 and QSIG). It also supports both ISDN Primary Rate Access (PRA) and Basic Rate Access (BRA) as well as Facility Associated Signaling (FAS), Non-Facility Associated Signaling (NFAS), and NFAS with backup D channel. Further, extensions to IUA are defined for DPNSS/DASS2 , V5.2 , and GR 303  that will most likely become RFCs in the future.
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