ISDN Q.921-User Adaptation LayerISDN Q.921用户适配层 Instituto Universitario AeronÁutico (Argentina Air Force University)Instituto Universitario AeronÁutico (Argentina Air Force University) International Underwriting Association of London (formerly London International Insurance and Reinsurance Market Association; UK)伦敦的国际承销协会(原伦敦国际保险、再保险市场协会;英国) Individual User Authentication (Cisco)个人用户认证(思科) International Union of Architects国际建筑师协会 International Union of Academies国际联盟的院校 Image Understanding Architecture理解建筑形象 International University of Africa (Sudan)国际大学的非洲(苏丹) International Underwriting Association国际承销的协会 ISSE User AgentISSE用户代理 Institut Universitari de l'AudivisualUniversitari Institut de fixation 'Audivisual ISDN Q-921-User Adaptation LayerISDN Q-921-User适配 Izquierda Unida de AragÓn IU-Izquierda Unida de AragÓn IU