What prevents a phone number from being contacted too often?

The correct answer is the Do Not Contact (DNC) list because it serves as a safeguard against excessive outreach to individuals who have opted out of being contacted. This list typically includes phone numbers that are either legally protected from being called for marketing purposes or have been specifically requested by the individuals to not receive further communications. By adhering to the DNC list, an outbound campaign ensures compliance with legal regulations and promotes respect towards consumer preferences.

Attempt controls primarily manage the frequency and timing of calls made to a single number, helping to prevent over-contacting by setting limits on how often specific numbers can be dialed within a certain period. Dialing modes dictate the method by which calls are made, impacting efficiency and strategy but not directly managing contacting frequencies. Wrap-up codes are used to categorize and document the outcome of interactions after calls but have no direct influence on the frequency of calls made to the same number.