Conferences may include a poll, where the the operator reads a question and lists out choices identified by number.
For example, the operator might ask: "What is the best time to schedule training classes? For morning, press *1. For lunchtime, press *2. For afternoon, press *3. For evenings or weekends, press *4."
To answer the poll, use the telephone keypad. If you want to change your vote, just enter a new vote before the operator announces the poll is closed.