There are two parts to getting an approval to transmit your voice using an aeronautical radio:
Other than in an emergency, it is illegal to make a voice transmission on an aeronautical radio frequency unless you hold a relevant certificate of competency - NZ Radiocommunications Regulations 2001(external link). Most commonly, this certification of operator competency is achieved by obtaining a Part 61 Pilot Licence, or a Part 65 Air Traffic Services Personnel Licence.
However, a bespoke radio training course can be arranged where the requirement to communicate on an aviation radio frequency is a condition of a Part 102 certificate, or authorisation to operate in controlled airspace. The requirements for this course must be discussed with the CAA Part 102 Unmanned Aircraft Certification team or an Emerging Technologies Unit (ETU) Project Advisor before commencing any training and/or booking exams.
To comply with International Telecommunications Union Regulations,(external link) all aircraft radio transmissions worldwide must include an approved callsign. Approval to use an aeronautical radio and the allocation of an appropriate callsign is managed through the Part 102 certification process. Some points to note: