PART V - CO-OPERATION AND JUDICIAL ASSISTANCE
28. Securing attendance of witnesses
(3) The Magistrate shall, if satisfied that the summons was issued by the International Criminal Court, endorse it for service upon such person, and the endorsed summons may be served as if it were a summons issued by the Magistrate.
(4) A return of service indicating that the summons was properly served on the person concerned, together with a certificate by the Magistrate to the effect that such person failed to appear at the time and place specified in the summons, shall be prima facie proof that the said person failed to appear before the International Criminal Court.
Direct execution of requests on State territory
Execution of requests for assistance (under Articles 93 and 96) in accordance with national law
Cooperation under procedures of national law
EDIT.