Opt-outs & Quiet Hours
STOP/START handling, the opt-out list, and quiet-hours deferral — compliance that runs automatically.
HUM bakes texting compliance into the platform so your team doesn't have to police it manually.
Carrier keywords
Inbound STOP, STOPALL, UNSUBSCRIBE, CANCEL, END, and QUIT opt the number out automatically. START, YES, and UNSTOP opt it back in. HELP and INFO get the standard help response. No configuration required.
The opt-out list
Once a number opts out, every outbound path — inbox sends, AI replies, campaigns, in-call texts — short-circuits before a message is ever attempted. You can review and manage the opt-out list, and add opt-outs manually when a customer asks by phone.
Quiet hours
Outbound texts outside your organization's business hours are automatically deferred and sent at the start of the next open window. Human senders in the inbox can intentionally override when it's appropriate; automated sends honor quiet hours.
Consent suffix on AI texts
The first text an AI agent sends a caller during a phone call automatically carries a "Reply STOP to opt out." suffix when there's room, and in-call texting is capped at two messages per call — both enforced server-side.
Events for your systems
Subscribe to messaging webhooks (sms.received, sms.sent, sms.delivered, sms.failed, sms.opt_out, sms.opt_in, and conversation lifecycle events) to mirror compliance state into your own systems — see Webhooks.