Final answer:
Broker-dealers must honor do-not-call requests within 31 days as per FCC regulations, adding the person's number to a do-not-call list and ceasing calls.
Step-by-step explanation:
Broker-dealers are required to honor a person's do-not-call request within a reasonable period, not exceeding 31 days according to Federal Communications Commission (FCC) regulations. If a person asks not to be called, the broker-dealer must add the person's number to their do-not-call list and cease calls to that number within this timeframe.