Ringless voicemail drops and the consent rules

A ringless voicemail drop is a prerecorded message that lands in someone's voicemail box without their phone ringing. It works as a low-effort follow-up for people who asked to hear from you. As cold outreach it is risky: the FCC treats ringless voicemail to mobile phones as a call that needs consent, and consumers can sue for each message.

How to do it

1. Start with a consent list. Use people who gave you their mobile number and agreed to marketing messages, for example in a signup form with clear wording. The FTC says a robocall selling something is illegal unless the company got written permission, given directly, to call that way.
2. Write a 20 to 30 second script. Say who you are, why you are calling, and one next step: a callback number or a link you will text them. Name your company and give a number that works.
3. Record it in your own voice. A real voice sounds like a person leaving a message, and it is easier to keep the tone honest.
4. Pick a provider. Slybroadcast and Drop Cowboy are two vendors that sell this service. Ask each how it counts a billable drop (delivered or attempted), what opt-out handling it includes, and whether you can suppress numbers.
5. Send in small batches during normal daytime hours in the recipient's time zone, and honor every "stop" or callback asking to be removed the same day.
6. Count callbacks and conversations, not drops sent. A callback is a signal of interest, but it can also be someone asking you to stop.

What it looks like in practice

Say you sell a scheduling tool and someone filled in a "request a demo" form but never booked a slot. Your form included a checkbox: "Yes, text or call me about my demo request, including prerecorded messages." Two days later you drop a 25 second voicemail: your name, the company, a line that you saw their request, and a number to call or reply to. If you get a callback, a person picks up. If someone says stop, you remove them from the list and every other campaign. This is a walkthrough of one possible setup, not a result.

When it backfires

• It is a regulated call. In a November 2022 ruling, the FCC said ringless voicemail to wireless phones requires prior consent because it is a call made with an artificial or prerecorded voice. The ruling did not ban the practice.
• Damages add up per message. Under the TCPA, a person can recover $500 for each violation, and a court can increase that up to three times for a willful or knowing violation. A large list with no consent is a large liability.
• "Callbacks mean they are interested" is weaker than it sounds. People also call back to ask who you are or to complain. Treat callbacks as leads only after a real conversation.
• Cold lists are the weakest use. Bought lists, scraped numbers and old numbers that changed hands are where most of the legal and reputation trouble starts.
• There is no public data you can rely on for response rates. Vendor blogs quote numbers, but they sell the service. Measure your own list.

If you need cold outreach without this risk, email is the safer channel. See cold email copywriting and how long a cold email should be.

Questions people ask

What is ringless voicemail? It is a voicemail delivered straight to a phone's voicemail box with no ring. The recipient sees a missed-call or new-voicemail notification and can call back.

Is ringless voicemail legal? Yes, with consent. The FCC said in 2022 that it falls under the TCPA, so you need prior consent for mobile numbers, and the FTC requires written permission for sales robocalls.

How does ringless voicemail marketing work? You upload a list and a recording to a provider, which delivers the message to each number's voicemail box. You then handle callbacks and removals yourself.

Sources

• Faegre Drinker: FCC ruling on ringless voicemails, Nov 21, 2022, read Oct 8, 2026
• FTC consumer advice: Robocalls, read Oct 8, 2026
• 47 U.S. Code section 227 (TCPA), Cornell Law School, read Oct 8, 2026
• Drop Cowboy FAQ, read Oct 8, 2026
• Slybroadcast, read Oct 8, 2026