To be requested by international letters rogatory. Contents: - an indication of the authority making the request; - the object of and the reason for the request; - time and place of perpetration of the offence, and a summary of the facts; - where possible, the identity and the nationality of the person concerned; - the identification and address of the suspect, accused person or witness to be heard; - an indication of the criminal conduct under investigation, including the statutory basis and the sanctions attached thereto; - any specific procedure requested by the requesting party, in particular whether the witness is to be heard under oath or not, and whether he is to be informed about any rights in application of the procedure of the requesting State. In case of the hearing of a suspect by the investigating magistrate, obligation to inform of the right to legal counsel in application of article 81 of the Code of Criminal Procedure; appointment of a counsel is mandatory for suspects an accused persons under eighteen years of age. Plaintiffs or victims may assist to the hearing. In principle, at the hearing of a witness, the accused or the victim are not present. Witnesses must present themselves; unwilling witnesses may be compelled to appear by warrant. Audio or video recordings are possible if the witness consents. Audio or video recordings are compulsory in certain cases for the hearing of minors of age who must, in principle, be accompanied by an adult. Hearings are formalised in a report. Execution of the measure in conformity with the procedure applicable in the requesting State : possible as a matter of principle; to be assessed on a case by case basis. Relevant formalities to be expressly indicated.