BEGIN:VCALENDAR
PRODID:-//ABC Corporation//NONSGML My Product//EN
VERSION:2.0
BEGIN:VTODO
DTSTAMP:19980130T134500Z
SEQUENCE:2
UID:uid4@example.com
ORGANIZER:mailto:unclesam@example.com
ATTENDEE;PARTSTAT=ACCEPTED:mailto:jqpublic@example.com
DUE:19980415T000000
STATUS:NEEDS-ACTION
SUMMARY:Submit Income Taxes
BEGIN:VALARM
ACTION:AUDIO
TRIGGER:19980403T120000Z
ATTACH;FMTTYPE=audio/basic:http://example.com/pub/audio-
 files/ssbanner.aud
REPEAT:4
DURATION:PT1H
END:VALARM
END:VTODO
END:VCALENDAR