.......ML centre & all stations 126.8 in the xxxxxx area IFR Beech Super KIngair VH-XXX 45 mls SSW passing 7500' (or vacated a particular FLVL or height/alt) on visual (insert vis or in cld) decent inbound, circuit for ldg 06.
This is an Eg. of what I say when changing to a freq that is available to ALL pilots in & around the intended ldg aerodrome. That sums it up in one simple TX.
CW