US A2P 10DLC SMS Compliance & Wholesale Voice Peering Guide
Published by AVM Networks NOC Engineering • Category: Compliance & Security • 10 min read
Authoritative guide to US A2P 10DLC campaign registration, CTIA messaging standards, The Campaign Registry (TCR), and wholesale SIP voice CLI compliance across US carriers.
Authoritative guide to US A2P 10DLC campaign registration, CTIA messaging standards, The Campaign Registry (TCR), and wholesale SIP voice CLI compliance across US carriers.
- All commercial A2P messaging terminating in the US (+1 NANP) requires Brand and Campaign registration via The Campaign Registry (TCR).
- CTIA guidelines mandate explicit opt-in consent, automated STOP opt-out handling, and strict prohibition of SHAFT category content.
- Wholesale SIP voice trunks enforce FCC STIR/SHAKEN cryptographic caller identity and non-manipulated E.164 CLI pass-through.
1. What is the US A2P Messaging Regulatory Landscape and 10DLC Mandate?
Enterprise messaging and voice termination into the United States (+1 NANP) are governed by carrier-enforced industry guidelines and federal regulations. Unlike international markets that support dynamic Alphanumeric Sender IDs, major US wireless carriers (Verizon, AT&T, T-Mobile) require all commercial application-to-person (A2P) traffic to originate from registered 10-Digit Long Codes (10DLC), verified Toll-Free numbers (TF-SMS), or dedicated Short Codes.
Under the CTIA (Cellular Telecommunications Industry Association) Messaging Principles and Best Practices and governance by The Campaign Registry (TCR), non-registered long code traffic is subject to severe carrier filtering, spam blocking, and financial penalties.
2. How Does The Campaign Registry (TCR) Brand and Campaign Registration Work?
The Campaign Registry serves as the centralized clearinghouse established by US mobile network operators to vet enterprise senders. Successful A2P 10DLC messaging requires a two-step registration workflow:
- Brand Registration: Establishing legal corporate identity via EIN (Employer Identification Number) or tax registration details, verified against official business registers.
- Campaign Provisioning: Registering specific messaging use cases (e.g., 2FA OTP tokens, transactional order alerts, customer care) with explicit opt-in disclosure, sample message copy, and Privacy Policy URLs.
AVM Networks assists enterprise clients and wholesale aggregators by providing automated TCR campaign provisioning and route mapping to ensure delivery throughput and minimize carrier filtering.
3. What Are CTIA Guidelines Regarding Explicit Consent, Opt-Outs, and SHAFT Restrictions?
To maintain carrier compliance and prevent campaign suspension, all A2P SMS transmitted into the US must strictly comply with CTIA guidelines:
- Explicit Consent: Prior express consent must be obtained from consumers before dispatching any transactional or promotional SMS. Consent cannot be transferred, shared, or sold.
- Mandatory Opt-Out & Support Keywords: Campaigns must support automated handling of standard opt-out keywords (STOP, CANCEL, UNSUBSCRIBE) and customer support info (HELP, INFO).
- SHAFT Content Prohibition: Content involving Sex, Hate, Alcohol, Firearms, or Tobacco/Cannabis (SHAFT) is strictly forbidden unless operating within specific age-gated legal categories.
4. How Does Wholesale SIP Voice Ensure STIR/SHAKEN and E.164 Caller ID Compliance?
For voice termination across the North American Numbering Plan (NANP), AVM Networks delivers high-capacity SIP v2.0 trunking supported by authentic Calling Line Identification (CLI) pass-through.
- STIR/SHAKEN Alignment: In response to FCC robocall mitigation mandates, voice traffic terminating into US networks must preserve legitimate E.164 caller identity. AVM Networks enforces strict anti-spoofing gateway policies.
- Technical Interconnect: Bilateral SIP peering supports G.711u (PCMU) and G.729a codecs over TLS signaling and SRTP payload encryption with low Post Dial Delay (PDD).
AVM USA Wholesale SMS & Voice Interconnect
Deploy compliant US A2P 10DLC SMS termination and carrier-grade wholesale SIP trunking across all 50 US states (+1 NANP).
View USA SMS Network →Authoritative Standards & Regulatory Citations
- CTIA Messaging Principles and Best Practices (CTIA)
- FCC Robocall Mitigation & STIR/SHAKEN Governance (Federal Communications Commission)
- The Campaign Registry (TCR) Official Framework (The Campaign Registry)
Frequently Asked Engineering Questions
Are Alphanumeric Sender IDs permitted for US SMS termination?
No. US wireless carriers do not support Alphanumeric Sender IDs. All A2P SMS must be routed using registered 10DLC numbers, verified Toll-Free numbers, or dedicated Short Codes.
What is required for 10DLC Brand and Campaign registration?
Registration requires official business tax registration details (EIN/CR), verified brand identity, campaign description, sample message templates, and a compliant Privacy Policy URL.
What is SHAFT content in US messaging compliance?
SHAFT stands for Sex, Hate, Alcohol, Firearms, and Tobacco (including Cannabis). Content within these categories is prohibited across US A2P 10DLC messaging channels under CTIA rules.