To make any sort of standard call-out, you need to:
1. Closely observe the operation.
2. Comprehend what you observe.
3. Verbalized when the event happens.
...and be prepared to be vilified if you get it wrong...and castigated if you miss a call.
I find this is all very stress-full, time-consuming and the process interrupts the karma and gentle soothing of my iPod music.
I mean 99 times out of 100 it just doesn't matter, does it?