New York Consolidated Laws, Civil Practice Law and Rules - CVP  Rule 3107. Notice of taking oral questions

A party desiring to take the deposition of any person upon oral examination shall give to each party twenty days' notice, unless the court orders otherwise.  The notice shall be in writing, stating the time and place for taking the deposition, the name and address of each person to be examined, if known, and, if any name is not known, a general description sufficient to identify him or the particular class or group to which he belongs.  The notice need not enumerate the matters upon which the person is to be examined.  A party to be examined pursuant to notice served by another party may serve notice of at least ten days for the examination of any other party, his agent or employee, such examination to be noticed for and to follow at the same time and place.