Saedi, RahimLee, Kong AikKinnunen, TomiHasan, TawfikFauve, BenoitBousquet, Pierre-MichelKhoury, ElieMartinez, Pablo Luis SordoKua, Jia Min KarenYou, ChanghuaiSun, HanwuLarcher, AnthonyRajan, PadmanabhanHautamäki, VilleHanilci, CemalBraithwaite, BillyRosa, Gonzalez-HautamäkiSadjadi, Seyed OmidLiu, GangBoril, HynekShokouhi, NavidMatrouf, DrissEl Shafey, LaurentMowlaee, PejmanEpps, JulienThiruvaran, TharmarajahVan Leeuwen, DavidMa, BinLi, HaizhouHansen, JohnBonastre, Jean-FrançoisMarcel, SébastienMason, JohnAmbikairajah, Eliathamby2013-12-192013-12-192013-12-19201310.21437/Interspeech.2013-472https://infoscience.epfl.ch/handle/20.500.14299/98597I4U is a joint entry of nine research Institutes and Universities across 4 continents to NIST SRE 2012. It started with a brief discussion during the Odyssey 2012 workshop in Singapore. An online discussion group was soon set up, providing a discussion platform for different issues surrounding NIST SRE’12. Noisy test segments, uneven multi-session training, variable enrollment duration, and the issue of open-set identification were actively discussed leading to various solutions integrated to the I4U submission. The joint submission and several of its 17 sub-systems were among top-performing systems. We summarize the lessons learnt from this large-scale effort.text::conference output::conference proceedings::conference paper