whatever his or her nationality, shall not be prosecuted, detained, punished or subjected to any other restriction of his or her personal liberty in the territory of the State to which that person is transferred in respect of acts, omissions or convictions prior to his or her departure from the territory of the State from which he or she was transferred. 13. Each State Party shall designate a central authority that shall have the responsibility and power to receive requests for mutual legal assistance and either to execute them or to transmit them to the competent authorities for execution. Where a State Party has a special region or territory with a separate system of mutual legal assistance, it may designate a distinct central authority that shall have the same function for that region or territory. Central authorities shall ensure the speedy and proper execution or transmission of the requests received. Where the central authority transmits the request to a competent authority for execution, it shall encourage the speedy and proper execution of the request by the competent authority. The Secretary-General of the United Nations shall be notified of the central authority designated for this purpose at the time each State Party deposits its instrument of ratification, acceptance or approval of or accession to this Convention. Requests for mutual legal assistance and any communication related thereto shall be transmitted to the central authorities designated by the States Parties. This requirement shall be without prejudice to the right of a State Party to require that such requests and communications be addressed to it through diplomatic channels and, in urgent circumstances, where the States Parties agree, through the International Criminal Police Organization, if possible. 14. Requests shall be made in writing or, where possible, by any means capable of producing a written record, in a language acceptable to the requested State Party, under conditions allowing that State Party to establish authenticity. The Secretary-General of the United Nations shall be notified of the language or languages acceptable to each State Party at the time it deposits its instrument of ratification, acceptance or approval of or accession to this Convention. In urgent circumstances and where agreed by the States Parties, requests may be made orally, but shall be confirmed in writing forthwith. 15. A request for mutual legal assistance shall contain: (a) The identity of the authority making the request; (b) The subject matter and nature of the investigation, prosecution or judicial proceeding to which the request relates and the name and functions of the authority conducting the investigation, prosecution or judicial proceeding; (c) A summary of the relevant facts, except in relation to requests for the purpose of service of judicial documents; 22