as far as I know, Tunisia doesn't belong to the CEPT-Countries, but
everybody who wants can work from the clubstation, 3V8BB, even those who
don't have a license.
But for an eventual guest-license you should apply at:
Ministere des Transports et Communications
3 bis rue d'Angleterre
Don't think you'll get one, never heard or saw any other call on the bands
just, the club-stations operated by hams from Germany and Italy.