The Australian Communications and Media Authority (ACMA) has issued a discussion paper on VoIP services, iTWire reports. The ACMA is seeking feedback on issues including clarification of the rules regarding the use of geographical numbers and improved transparency when numbers are switched between operators. The move comes after research by the authority into the provision of VoIP services, following which it claimed that some operators were not complying with regulatory requirements such as the provision of number portability and an emergency call service. The ACMA has suggested that it could withdraw phone numbers for those operators that continue to breach the rules regarding geographical numbers. The closing date for comments is 28 February 2009.