It's the "ITF Team Championship for Men"
[DOC] [TLE] ITF - 2016 Davis Cup Regulations (English) [PAR] TITLE The Competition, the ITF Team Championship for men, shall be called the 
... to have the ability to compete in its own right, when the future participation of... [DOC] [TLE] Contemporary Memo - CopaDavis.com [PAR] 1.