The short version
Quick answer
Preserve the original voicemail audio, date and time, displayed caller information, callback details and the words identifying the business. Note what you actually heard and whether you interacted with a live person. The TCPA separately addresses artificial or prerecorded voice and automated dialing; an audio message should not be reduced to an autodialer question.
Save the original before relying on a transcript
If your voicemail app offers export, keep the original audio and capture the message details separately. Preserve the whole message, including identification and opt-out instructions, rather than only a promotional excerpt. Write down any interaction you remember without filling gaps.
Treat a transcript as a navigation aid. Mark uncertain words and retain the audio for comparison. These are editorial preservation suggestions, not a promise of admissibility or a test that reliably identifies the caller’s technology.
The voice restriction is a separate statutory route
Section 227(b)(1)(A) addresses specified calls made using an automatic telephone dialing system or an artificial or prerecorded voice, subject to its scope and exceptions. The word or matters: the artificial/prerecorded-voice issue is not limited to calls proven to use an autodialer.
Residential-line restrictions and exceptions are separately addressed in §227(b)(1)(B) and the FCC rules. Under §64.1200(a), message purpose and line type affect consent and exemption analysis. A recording alone does not establish every element, lack of consent or the identity of the responsible entity.
Source basis: 47 U.S.C. § 227 · 47 C.F.R. § 64.1200
What the FCC says about ringless voicemail
In FCC 22-85, released November 21, 2022, the Commission concluded that ringless voicemail using a consumer’s wireless number to route a prerecorded message to the associated mailbox is a call subject to the TCPA. The ruling addresses that technology, not an exemption merely because a handset did not audibly ring.
Do not infer the delivery method solely from the absence of a ring. Record that observation as an observation; establish the actual method separately. The ruling is an FCC interpretation, not a case-specific finding that a particular voicemail violated the law.
Source basis: FCC 22-85 (Nov. 21, 2022)
What to listen for in the message
Section 64.1200(b) requires artificial or prerecorded messages to identify the responsible entity at the beginning and provide specified contact information during or after the message. Covered advertising/telemarketing messages and certain exempt residential messages also have automated opt-out requirements; voicemail delivery has an associated callback mechanism requirement.
Preserve the full wording before assessing those conditions. Record whether the message offers a product, concerns an account or addresses another purpose, and whether it includes a way to stop further contact. Do not conclude an omission from a clipped recording proves an omission from the original.
Source basis: 47 C.F.R. § 64.1200
Fictional example: audio, display and uncertainty
A fictional voicemail promotes a service package, names a company and gives opt-out instructions. The recipient did not hear the phone ring. The display shows a local caller identifier.
The record should contain the original audio, timestamp, full displayed information, what was offered and the exact instructions. Annotate no ring heard rather than proven ringless delivery. The FTC warns that caller ID can be spoofed, so the display is not conclusive identification.
Source basis: FTC Consumer Advice
A safe next step
Use the preservation checklist and the unwanted-call reporting guide. For an illegal sales robocall, the FTC advises hanging up rather than pressing buttons to engage or remove yourself from the list. Do not call back an unverified voicemail solely to test its technology.
If you already made an opt-out, preserve its wording, method and time, then keep any later messages. This is an educational federal overview, not a determination of liability, available damages or the legality of recording a live conversation.
Source basis: FTC Consumer Advice