Northrop Grumman Park Air Systems, has added Voice over Internet Protocol (VoIP) capability to its range of air traffic management radios. The VoIP standards which have been specifically developed to meet the demands of the air traffic management (ATM) environment will be available on all of the company's PAE T6 range of VHF and UHF radios with immediate effect. In March 2009, Northrop Grumman Park Air Systems joined 10 other manufacturers of air traffic communication systems to confirm that the specifications, which were developed by the European Organisation for Civil Aviation Equipment (EUROCAE) Working Group 67, provided a robust standard that allowed the interworking of ground radios and voice communication systems. The provision of VoIP is a progression of Northrop Grumman Park Air Systems' already established IP capability.