0001047469-98-015399 S-4 6 19980416 NASD IDT CORP 0001005731 7373 223415036 DE 0731 S-4 33 333-50307 98595786 190 MAIN ST HACKENSACK NJ 07601 2019281000 294 STATE STREET HACKENSACK NJ 07601 S-4 1 000104746998015399-001-seq1-s-4.txt FORM S-4 EX-5.01 2 000104746998015399-002-seq2-ex-5-01.txt OPINION (MORRISON & FOERSTER LLP) EX-23.1 3 000104746998015399-003-seq3-ex-23-1.txt CONSENT (ERNST & YOUNG LLP) EX-25.1 4 000104746998015399-004-seq4-ex-25-1.txt FORM T-1 EX-99.1 5 000104746998015399-005-seq5-ex-99-1.txt LETTER OF TRANSMITTAL EX-99.2 6 000104746998015399-006-seq6-ex-99-2.txt NOTICE OF GUARANTEED DELIVERY