Interesting to see that it clearly varies greatly from airline to airline! In my airline its not a statement as I said, its a question. One to which unless a reply is forthcoming there will be no take-off!

Its just a warning in mine.

We don't accept the line up clearance unless we have been told cabin secure.

Its a bit cheeky to be waiting for a cabin secure after you have entered an active runway.

It is very interesting to find out that different airlines have different procedures just before take off. When I started with easyJet, I thought they were all the same. But I've gone over to help the ex-GB Airways crews integrate into EZY and found they have very similar practices to BA. Which is good to know, as I've just got a job with BA WW

WOW!! It really does vary in each airline.. I was thinking about leaving my airline for another one, but I dont think I have the room in m head to change all the ding dong meanings! J/k..

In my airline the DING DONG is an audio alert to inform CC that the CSM/Purser whatever u want to call them is making an Interphone call to all crew stations. After taxiing this ding dong is a phone call to insure all doors are armed and cross checked.
The same just after u touch down.. except its to ensure doors are disarmed and cross checked!

In Ryanair its the flight deck asking the CSS if the cabin and galley is secure and ready for take off.