PART II - REQUESTS
4. Request from Mauritius
(2) A request under subsection (1) may require the foreign State or, as the case may be, the international criminal tribunal, to provide such assistance as may be specified in the request and, in particular to -
(k) facilitate the appearance of witnesses or the attendance of persons in proceedings, subject to such practical and financial arrangements as may be agreed upon ;
Facilitating voluntary appearance of persons - national proceedings
EDIT.