Originally Posted by
romeocharlie
At a guess I'm going to say numbers....
Probably worth mentioning that the "numbers" is not a chat frequency and not for swapping s#~*t.
http://www.airservicesaustralia.com/...ip/general.pdf
AIP GEN 3.4-4
3.1.5 Interpilot Air-to-Air Communication. In accordance with regional agreements, 123.45MHZ is designated as the air-to-air VHF communications channel. Use of this channel will enable aircraft engaged in flights over remote and oceanic areas out of range of VHF ground stations to exchange necessary operational information and to facilitate the resolution of operational problems.
http://www.airservicesaustralia.com/...5-Nov-2012.pdf
ERSA NAVIGATION AND COMMUNICATIONS NAV/COMM-1
4. AIR-TO-AIR COMMUNICATIONS - CIVIL
4.1 Interpilot air-to-air communications in Australian FIRs may be conducted on frequency 123.45MHZ. Communications between aircraft on this frequency are restricted to the exchange of information relating to aircraft operations. Communications are to be established by either a directed call to a specific aircraft or a general call, taking into account conditions pertaining to the use of the particular channel. As target aircraft may be guarding more than one frequency, the initial call should include the distinctive channel identification "INTERPILOT" or identification of the air-to-air frequency.
Kaz