[Ref Jeppesen, AIP Australia GEN 2.2-6, GEN3.2-10]
Warning – the definition of CTAF is a bit different between Australia and Jeppesen.
Common Traffic Advisory Frequency (CTAF) – in Australia
IMPORTANT – MULTICOM (126.7 MHz) is NOT the CTAF, in Australia!
According to Jeppesen, CTAF in USA, is a frequency designed for the purpose of carrying out airport advisory practices while operating to or from an uncontrolled airport. The CTAF may be a UNICOM, MULTICOM, FSS, or tower frequency.