I remember those rings across a floor. But if it was similar to the environment I remember there were phones everywhere and you just had to pick up the phone and switch the line.
The other thing is that most callers of a mobile number expect the phone to be picked up quickly or hang up as a phone left to ring can be that of someone in a meeting furiously trying to get to his phone after forgetting to turn the ring off.
If the phone is on my desk and I am across the room I usually don’t have time to get to it before the 3rd ring.