Compliance
Is Missed Call Text Back TCPA Compliant? The Plain-English Guide
The consent rules, quiet hours, opt-out requirements, and state laws that apply when your business texts customers — and the checklist that keeps you on the right side of them.
This guide is practical education, not legal advice. Texting law changes and varies by state — for decisions specific to your business, talk to an attorney.
The short answer
Texting back a customer who just called you is generally fine. Their inbound call is treated as consent to a reasonable, non-marketing response about why they called. The legal risk in business texting almost never comes from the text-back itself — it comes from what businesses do next: promotional follow-ups without written consent, ignored STOP replies, and messages sent at the wrong hours.
That distinction matters because the penalties are per message. TCPA statutory damages are $500 per violation, up to $1,500 when willful — multiplied across every text in a campaign, which is why settlements routinely reach six and seven figures. Compliance is not a nice-to-have in this category; it is the category.
The two consent tiers, and where a missed call sits
The TCPA (47 U.S.C. § 227) and the FCC's rules around it draw one line that explains almost everything:
- Transactional / informational texts — responding to a customer's call, confirming their appointment, answering their question. These need prior express consent, and a customer voluntarily calling your business and leaving their number is the textbook example of giving it.
- Marketing texts — offers, promotions, campaigns, anything that advertises. These need prior express written consent: a signature or checkbox, tied to disclosure language naming your business, that the customer can refuse without being denied service. A phone call is never written consent.
So the automatic "Sorry we missed your call — how can we help?" is on the safe side of the line, and so is the AI conversation that follows about pricing, hours, and booking, because the customer is asking and you are answering. A "20% off this week only!" blast to that same number three weeks later is on the other side of the line — different message, different consent requirement.
Quiet hours: the calling and texting window
Federal rules prohibit a solicitation before 8 a.m. or after 9 p.m., local time at the called party's location — the recipient's clock, never yours. The rule is 47 CFR § 64.1200(c)(1), and the FTC's Telemarketing Sales Rule sets the same window at 16 CFR § 310.4(c). It applies every day of the year, including Sundays and holidays.
An instant text-back to a live call effectively self-complies — the caller is holding their phone — but three cases need real enforcement in software:
- Scheduled follow-ups and reminders, which must be windowed to local time.
- Stricter state windows. Some states do not let calling start until 9 a.m., some require it to stop at 8 p.m., and a few bar Sunday or holiday calls outright. The stricter rule governs, so the recipient's state decides — not yours. Florida also caps how many times you can contact someone about the same matter in 24 hours.
- The queue itself. The window has to be checked when the message actually sends, not when it was queued: a follow-up queued at 8:45 p.m. that goes out at 9:04 p.m. because the queue backed up is a violation, and a busy evening is exactly when queues back up.
One more trap worth naming: an area code is not proof of where someone is. Numbers keep their area code when people move, so a 305 number can sit in Seattle. Where you have a service address, window against that rather than the area code.
Opt-outs: the part that generates lawsuits
Every recipient has the right to revoke consent, and revocation does not have to use the magic word — courts and the FCC treat any reasonable expression ("stop", "unsubscribe", "don't text me") as valid. Recent FCC rules require honoring revocations promptly, and the safe engineering answer is immediately and automatically:
- STOP, UNSUBSCRIBE, and variants suppress the number without a human in the loop.
- HELP returns your business name and contact info.
- The opt-out is recorded with a timestamp, because in a dispute the record is the defense.
The carrier layer: A2P 10DLC
Separate from the law, US carriers require businesses texting from regular 10-digit numbers to register their brand and use case (A2P 10DLC). Unregistered traffic gets filtered — your texts simply stop arriving — and carriers enforce their own content rules on top. This is why "just use a personal cell" is not a real alternative for business texting at any volume, and why a platform should handle registration for you. One number, one registered use — a number recycled across businesses or campaigns is a deliverability and compliance liability.
State mini-TCPAs
Florida's FTSA, Oklahoma, Washington, and a growing list of states layer their own rules on top of the federal ones — tighter hours, frequency caps, and private rights of action of their own. The practical takeaway for a local business is not to memorize fifty statutes; it is to keep your texting to the transactional side of the line, honor opt-outs instantly, and let your platform enforce the windows.
If an AI is doing the texting, say so
Where the conversation is held by AI — as it is with CompleteLine — the first message should say so plainly, and it should note when conversations are recorded or stored. Several states are legislating in exactly this direction, and disclosure costs nothing: customers do not abandon conversations because an assistant is honest about being one. CompleteLine builds the disclosure into the message pipeline itself rather than offering it as a setting, so it cannot be turned off per client.
The compliance checklist
- Text back only numbers that contacted you first — inbound call or text, never purchased lists or scraped numbers.
- Keep automatic texts transactional — respond, answer, book. No promotions without prior express written consent collected separately.
- Honor STOP instantly and automatically, keep timestamped opt-out records, and support HELP.
- Respect quiet hours on anything scheduled — 8 a.m.–9 p.m. local federally, tighter where states say so.
- Register your number (A2P 10DLC) and never reuse a number across businesses or campaigns.
- Disclose AI in the first message when an AI holds the conversation.
- Keep records — consent, conversations, opt-outs. The paper trail is the protection.
Frequently asked questions
Is it legal to text someone back after they call my business?
Generally yes. When a customer calls your business, that call is treated as consent to a reasonable, non-marketing text response about the reason they called. A single "sorry we missed you — how can we help?" text responding to their inbound call is transactional, not marketing. The risk starts when you go beyond responding: promotional blasts, follow-up campaigns, or texting numbers that never contacted you all require a higher tier of consent.
What is the difference between transactional and marketing texts under the TCPA?
Transactional texts respond to something the customer initiated — answering their missed call, confirming their appointment, sending the invoice they asked for. Marketing texts promote something — offers, discounts, review requests framed as promotions, win-back campaigns. Marketing to a mobile number requires prior express written consent: a signed or checked agreement that names your business and says they agree to receive marketing texts. A caller calling you is not that.
What are TCPA quiet hours?
Quiet hours are the times a telephone solicitation may not be made: before 8 a.m. or after 9 p.m., local time at the called party’s location. The rule is 47 CFR § 64.1200(c)(1), and the FTC’s Telemarketing Sales Rule sets the same window at 16 CFR § 310.4(c). Several states are stricter. An immediate text-back to a live inbound call is responding to someone who is clearly awake and holding their phone, but scheduled follow-ups and campaigns must respect the window.
What hours can you legally call or text a customer?
Under federal law, 8 a.m. to 9 p.m. — and it is the recipient’s clock that counts, not yours. A Colorado business calling someone in New York at 8 p.m. Mountain is calling them at 10 p.m. Eastern, which is a violation. Several states narrow the window further: some do not allow calls to start until 9 a.m., some require them to stop at 8 p.m., and a few bar Sunday or holiday calls entirely. The stricter rule always wins, so a business calling into more than one state should check the rules for each one rather than work from the federal window alone.
What are the TCPA time-of-day restrictions, and whose time zone applies?
The restriction is on telephone solicitations — calls or texts meant to encourage a purchase — and the clock is the called party’s local time, at their location. Where the caller sits is irrelevant. Two practical traps follow from that: an area code is not proof of where someone actually is, since numbers keep their area code when people move, and a queued message has to be checked against the window at the moment it sends, not when it was queued. A campaign queued at 8:45 p.m. that goes out at 9:04 p.m. has violated the rule.
Do quiet hours apply on weekends and holidays?
Under federal law the 8 a.m. to 9 p.m. window is the same every day of the year, including Sundays and holidays — there is no separate federal weekend rule. Some states do add one: a few prohibit solicitation calls on Sundays or on legal holidays, and at least one starts Sunday calling at noon rather than in the morning. If you call into those states, the state rule is the one that governs.
What happens if I ignore a STOP reply?
Every text after a revocation is a separate violation. TCPA statutory damages run $500 per message, up to $1,500 if the violation is willful — and plaintiffs’ firms actively recruit texting cases. Honor STOP (and its variants) immediately and keep a record of when you did.
Does using a platform like CompleteLine make me compliant automatically?
No platform can make your business compliant by itself — compliance is about what you send, to whom, and when. What a well-built platform does is make the mechanical parts impossible to get wrong: automatic STOP/HELP handling, opt-out records, quiet-hours enforcement on scheduled sends, A2P 10DLC registration, and AI disclosure built into every conversation. You stay responsible for using marketing consent correctly.
Text back every missed call — compliantly, by default
CompleteLine texts back every missed call in about 5 seconds and holds the conversation with AI — with STOP/HELP handling, opt-out records, AI disclosure, and A2P registration built in rather than bolted on. See how it works in the complete guide, or grab templates for what to text back.