About 15 years ago, some of the POs don't give you all the information in advance. They want you to to stay on the phone, and they feed you instructions one turn at a time. I had to sometimes and felt stupid. Most of the time, I told them I had bad signal in the area and will probably get cut off. Getting room numbers were easy once I was a repeat customer.
However, there were a couple ridiculous times when I closely followed someone receiving turn-by-turn instructions. And, intentional or not, they always seemed oblivious to my presence.