The wider opt-out keyword set is required on some platforms

The requirementstatement

Where the platform publishes a wider standard opt-out set, the declared keywords must cover HALT and STOPALL as well as the universal five.

Severityseverity: BlockingBLOCKINGBreaking this rule gets the submission rejected. There is no partial credit.
When it bitesphase: Gates approvalapprovalGet this wrong and the brand or campaign is refused at registration.
What is checkedobject: campaign.optout_keywords
Where it liveslayer: CampaignCAMPAIGN
How Ekas settles itdetectability: DeterministicDETERMINISTIC; Settled in code from the values you submitted. No model involved, no judgement call, same answer every time.
What the fix involvesfailureClass: Fix the fieldRETRY_FIELD; A better value in the form fixes it. Ekas can rewrite it and re-check.
Who requires itauthorities: Twilio
When it appliesapplicabilityText: Applies to every 10DLC registration.

Why this rule existsrationale

A consumer who texts HALT has opted out as far as they are concerned, and on a platform that treats HALT as a recognised opt-out the message is suppressed whether or not you declared it — so a declaration that omits it puts your suppression list out of step with what the platform has already done. You then keep sending to someone the platform believes unsubscribed, which is the pattern complaint volume is measured on.

How to fix itremediation

Add HALT and STOPALL to the declared opt-out keywords, and confirm your platform suppresses on both. Done when the declared set covers STOP, STOPALL, UNSUBSCRIBE, CANCEL, END, QUIT, HALT, OPTOUT and REVOKE.

A compliant exampleexample

optout_keywords: STOP, STOPALL, UNSUBSCRIBE, CANCEL, END, QUIT, HALT, OPTOUT, REVOKE

Provider rejection codescodes

The code you get back when this rule is what failed, and whether that provider lets you resubmit.

Provider	Code	Resubmit
Twilio	30887	Yes

Notesnotes

Twilio's published set adds HALT and STOPALL to the seven FCC per-se revocation keywords that CON-KW-REVOCATION-SET requires. Kept out of the universal baseline deliberately: neither the FCC nor CTIA lists them, so demanding them everywhere would fail compliant registrations to satisfy one platform. On an unknown submission target the rule passes and names the two additions rather than failing, because we cannot yet know whether they are owed. An incomplete or empty list is OPS-026 and OPS-027's finding, not this one.

Rules you will hit next

5 other rules read campaign.optout_keywords. Fixing one field to satisfy a single rule is how a resubmission trades one rejection for another, so read these before you change anything.

MSG-054Universal opt-out keywords must be supported in copy and configurationBlockingBLOCKING OPS-026The universal opt-out keyword set must be declaredBlockingBLOCKING OPS-027Opt-out keyword handling must be declared, not assumedBlockingBLOCKING CON-KW-REVOCATION-SETDeclared opt-out keywords should cover the FCC per-se setHighHIGH CMP-188A non-standard opt-out keyword is honoured by nobody but youMediumMEDIUM CMP-003Message flow must not begin or end with whitespaceBlockingBLOCKING

All campaign rules

CMP-187 is one of 94 campaign rules in the 915-rule 10DLC registry. Free to cite under CC BY 4.0.