PART V - CO-OPERATION AND JUDICIAL ASSISTANCE
28. Securing attendance of witnesses
(1) Every summons issued by a Judge or the Prosecutor of the International Criminal Court for the attendance of a person in any proceedings before the International Criminal Court shall be transmitted to the Attorney-General.
(2) On receipt of a summons, the Attorney-General shall immediately transmit it to the Magistrate within whose area of jurisdiction the person resides or is present.
(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.
National procedures for execution of cooperation request
Other forms of cooperation
National procedures for execution of requests for other forms of cooperation
Request for other forms of cooperation
Facilitating voluntary appearance of persons - national procedures for ICC proceedings
Assistance of States in the attendance and testimony of witnesses and production of documents
EDIT.