Tele-Communication (Telecom) Terms Glossary and Dictionary
IUA: ISDN Q.921-User Adaptation Layer
ISDN Q.921-User Adaptation Layer(IUA), a protocol in the SIGTRAN protocol suite, defines a method for backhauling of ISDN Q.921 User messages over IP using the Stream Control Transmission Protocol (SCTP). IUA is used between a Signaling Gateway (SG) and Media Gateway Controller (MGC). It is assumed that the SG receives ISDN signaling over a standard ISDN interface.