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Glossary · Dialing

What is List penetration?

  • Also called: list coverage, penetration rate

Reviewed by Sujan ThapaliyaLast updated

Definition

List penetration is the share of a calling list that has been worked to its defined attempt limit — not the share dialled once. It answers whether a campaign has genuinely been exhausted or has simply been skimmed.
The three STIR/SHAKEN attestation levels, which underpin how list penetration behaves in practice: A asserts both that the carrier knows the customer and that the customer may use the calling number, B asserts the customer only, and C asserts neither. A shared number pool can reach B at best, which is why number ownership keeps recurring in these definitions.
Attestation is the backdrop to most caller-ID and deliverability terms, list penetration included.

In practice

How list penetration actually works

Skimming is the default failure. Reps work the easy records repeatedly and leave the harder ones untouched, so a list can show heavy activity while a third of it has never been dialled.

Measuring penetration properly requires a defined cadence: how many attempts, over how many days, at what times. Without that, every record is either in progress or abandoned depending on who is asked.

It matters commercially because unpenetrated list is unrealised pipeline you have already paid for. Buying more data before penetrating the existing list is the most common wasted spend in outbound.

Penetration also decides whether a campaign's results mean anything. Comparing conversion between two lists worked to different depths compares the lists and the effort at once, and the usual conclusion — that one list was better — is often just that it was worked harder.

Worked example

A 5,000-record list with a six-attempt cadence has been penetrated when each record has had six attempts or an outcome — not when 5,000 dials have been placed.

List penetration: common questions

How many attempts should a cadence have?
Commonly six to eight over two to three weeks, varied by day and time of day. Fewer leaves reachable people uncalled; many more produces complaints without producing conversations.
Why does list penetration matter more than dial count?
Because dial count can be produced by calling the same easy records repeatedly. Penetration tells you what share of the opportunity has actually been touched.
When should a list be retired?
When the defined cadence is complete and the outcomes are recorded. Anything else is either still in progress or was abandoned without being measured.

Sources

  1. Combating Spoofed Robocalls with Caller ID Authentication — Federal Communications CommissionThe STIR/SHAKEN framework, the attestation levels carriers sign calls with, and the mandate requiring providers to authenticate caller ID.
  2. 47 U.S.C. § 227 — Restrictions on the use of telephone equipment — Cornell Legal Information InstituteThe Telephone Consumer Protection Act itself — the consent requirements, calling-hours limits, and private right of action.
  3. ITU-T Recommendation E.164 — The international public telecommunication numbering plan — International Telecommunication UnionThe international number format, the 15-digit maximum, and how country codes and national numbers compose.

See list penetration in the product

An auto dialer is any system that places outbound calls without a person keying digits. There are four modes — power, preview, progressive and predictive — and they differ in how many calls run per rep and who hears the phone ring first. All four are in the base product here, switchable per campaign.

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