All VMR/CG stations will direct you away from channel 16 to their 'working channel'. The idea is to keep channel 16 free for emergency use.
I am a member of VMR Brisbane (Sandgate), who use channel 67 as a 'working channel' for logging on/off. I dont call in on 16, only 67.
Recently I was in lucinda, the Coast Guard there used a different working channel to where I am used to. If Ihad gone offshore or needed assistance I would have called in on 16 then moved to their preferred channel. IF everyone in brisbane used the same channel it would get quite busy on the particular channel.