PART XII
Procedure in criminal cases in international relations
Chapter 62
Judicial assistance and service of documents in criminal cases
Article 585. The actions necessary in criminal proceedings may be conducted by way of judicial assistance, particularly the following :
(4) summoning of persons staying abroad to make a personal voluntary appearance before the court or state prosecutor, in order to be examined as a witness or to be submitted to confrontation, and the bringing of persons under detention, for the same purposes, and
Facilitating voluntary appearance of persons
EDIT.