SMS consent process.

Overflow, a Knova Labs product of Cerberus Capital LLC. Last updated August 6, 2026.

This page is the public evidence for Overflow’s low-volume booking-link SMS program. It has one opt-in method: verbal consent during a connected live call. It sends one requested booking link. It does not send recurring or unsolicited promotional texts under this consent.

Messages for this program are sent from +15185004120.

Booking-form reminders are separate

The Recovery Call booking form and homepage widget are not opt-in paths for this booking-link program. A separate, optional, initially unchecked checkbox authorizes only appointment reminder texts for the Recovery Call the visitor books through Cal.com. It cannot authorize or trigger the booking-link text; the recipient must have already requested that link during a connected live call before opening the form.

Text me Overflow Recovery Call reminders through Cal.com. Message frequency varies. Msg & data rates may apply. Reply STOP to opt out or HELP for help.

Exact verbal opt-in

After a business owner asks for the booking link, the operator reads this disclosure exactly:

Would you like me to text the Overflow booking link to this number? You'll receive one text. Message and data rates may apply. Reply STOP to opt out.

1. The operator reaches the business owner through the connected Twilio dialer call.
2. After the owner asks for the booking link, the operator reads the exact disclosure below.
3. Only an affirmative answer permits a booking-link text.
4. The server verifies the call belongs to the same lead, operator, and destination number.
5. The delivery worker rechecks suppression and quiet hours before sending the one requested text.

Operator consent gate

This PII-free screenshot is generated from the same operator-consent component and versioned contract used in the live dial screen. It shows the default unchecked state; no SMS delivery is created.

Message sent after consent

Consent record retained

Overflow stores an immutable delivery record containing:

• Provider call reference
• Operator user ID
• Consent capture time
• Disclosure version
• Destination number
• Rendered message body
• Twilio message ID when the provider accepts the send, plus delivery or block status

What does not count as consent

• A publicly listed business number
• A cold call without an affirmative request
• A voicemail
• Silence or no response
• Continued conversation without an explicit yes

Overflow does not send a cold follow-up text merely because a business number is public or because an operator left a voicemail.

Frequency, help, and opt-out

The requested booking-link flow sends one text. Message and data rates may apply. Reply STOP to opt out or HELP for help. Read the messaging terms, terms of service, and privacy policy.