Plain-English definitions of the terms that show up in A2P 10DLC registration, brand vetting and carrier rejection notices.
STOP and HELP are the text replies people use to opt out of or get help with your SMS program. Learn the keyword rules from CTIA, TCR, and the FCC.
Read it → Opt-inSMS opt-in consent is a person's clear permission to get your texts. Learn CTIA's three consent levels and what a compliant web opt-in form includes.
Read it → A2PA2P means application-to-person: texts a business sends through software. Learn how CTIA now calls it Non-Consumer messaging and what consent it needs...
Read it → 10DLC10DLC means 10-digit long code: a normal-looking business phone number approved by US carriers for A2P texting. Here is how it works and what it needs...
Read it → TCRThe Campaign Registry (TCR) is the hub where 10DLC brands and campaigns are registered. Learn who uses it, what it checks, and what it does not do.
Read it → Campaign use caseA 10DLC campaign use case is the category you pick for your texts, like Marketing or Account Notifications. See TCR's standard and special use cases.
Read it → CSPA CSP (Campaign Service Provider) registers 10DLC brands and campaigns with The Campaign Registry for businesses. Learn what that means for you.
Read it → Sole proprietor brandA 10DLC sole proprietor brand is for US or Canadian individuals and small businesses with no EIN. See TCR and Twilio limits and what to watch out for.
Read it → EINAn EIN is the IRS's 9-digit business tax ID. Standard 10DLC brands use it, and the legal name must match your IRS letter exactly. Here is what to know...
Read it → Short codeAn SMS short code is a 5 or 6 digit number leased from the US Short Code Registry. See lease costs and how short codes compare to 10DLC and toll-free.
Read it → Brand vettingBrand vetting is an optional third-party review that gives your 10DLC brand a 0 to 100 score. Learn standard vs enhanced vetting and Authentication+.
Read it → Toll-free verificationToll-free verification is the review a business completes before texting from a toll-free number. See how it differs from 10DLC and the 2026 EIN rule.
Read it →A new .com with hosting, SSL, a privacy policy that covers SMS, SMS terms and a compliant opt-in form, live in about 15 minutes. You submit your own 10DLC registration.
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