Part VI
Mutual legal assistance in criminal matters
CHAPTER I
Provisions common to different forms of assistance
Article 145
Principle and scope
2. Assistance shall include in particular the following :
d) the service of writs to and hearing of suspects, accused persons, witnesses or experts ;
Questioning of persons - authority - ICC proceedings
Examination of witnesses - authority - ICC proceedings
Facilitating voluntary appearance of persons - authority - ICC proceedings
EDIT.