This manuscript describes the I4U submission to the 2020 NIST Speaker
Recognition Evaluation (SRE'20) Conversational Telephone Speech (CTS)
Challenge. The I4U's submission was resulted from active collaboration among
researchers across eight research teams - I2R (Singapore), UEF (Finland),
VALPT (Italy, Spain), NEC (Japan), THUEE (China), LIA (France), NUS
(Singapore), INRIA (France) and TJU (China). The submission was based on the
fusion of top performing sub-systems and sub-fusion systems contributed by
individual teams. Efforts have been spent on the use of common development and
validation sets, submission schedule and milestone, minimizing inconsistency in
trial list and score file format across sites.Comment: SRE 2021, NIST Speaker Recognition Evaluation Workshop, CTS Speaker
Recognition Challenge, 14-12 December 202