The SOP is clear on this.
Change to the Talk Group listed on your pager (which in itself created confusion at the crash at Carey Gully / Cudlee Creek)......
You do not need to be told to change, you are just meant to go there.
If there is no station on air then tough luck. If you need something, you change back to 124, and when you have passed your message, you go back to the channel listed on your pager....
The SOP also states that stations are not meant to come up on 124 to advise they are on air...they go straight to the channel listed on the pager, and come up there......
Pip