1. What is A2P 10DLC?
Let's break down the jargon:
- A2P (Application-to-Person): The industry term for text messages sent from software — like Blueprint Softphone — rather than from a personal phone.
- 10DLC (10-Digit Long Code): Your regular US phone number (the standard 10-digit format), as opposed to short codes like 12345.
US mobile carriers — AT&T, T-Mobile, Verizon — now require businesses to register before sending A2P messages through 10DLC numbers.
This isn't a Twilio thing or a Blueprint thing. It's an industry-wide requirement enforced by the carriers to reduce spam.
2. What Happens Without Registration?
- Receiving texts: Works perfectly. A2P rules only affect outbound messages.
- Sending texts: Messages may still go through, especially at low volumes. But carriers can silently filter or delay unregistered messages without warning.
- The risk increases with volume: If you send just a few texts a day, you may never notice. If you send dozens or hundreds, carriers are more likely to flag your traffic.
Bottom line: Registration ensures your messages reach their destination reliably.
3. What Blueprint Softphone Does For You
The app handles the infrastructure setup automatically:
Messaging Service Created (Automatic)
Blueprint Softphone creates a Messaging Service in your Twilio account and attaches your phone number to it. This is the infrastructure foundation for A2P compliance. You do this with one click in Settings → Phone Lines → "Set Up Now."
Phone Number Added to Sender Pool (Automatic)
Your phone number is added to the Messaging Service's sender pool. Done — no need to log into Twilio for these steps.
4. What You Need to Complete in Twilio
The remaining steps require information only you can provide. You'll complete these directly in your Twilio Console.
Brand Registration
Twilio needs to know who you are as a business. You'll provide:
- Business name
- EIN (tax ID) — or equivalent for non-US businesses
- Business address
- Contact information
- Industry / vertical
Campaign Registration
Twilio needs to know how you'll use SMS. You'll describe:
- Your use case (e.g., "Customer appointment reminders" or "Business communications")
- Sample messages
- How users opt in to receive texts
- Estimated message volume
Opens the Twilio Console in a new tab. You'll need your Twilio login.
5. Frequently Asked Questions
The registration itself takes about 10–15 minutes to fill out. Twilio's review typically completes within a few business days, though it can vary.
Twilio charges a small one-time fee for Brand registration (typically around $4) and a recurring Campaign registration fee (typically $2/month). These are Twilio's fees, not ours.
Your texts may still work, especially at low volumes. But carriers can silently filter messages without warning, and there's no way to predict which messages will be affected. Registration is the only way to guarantee reliable delivery.
A2P 10DLC is specifically a US carrier requirement. If you're sending texts to US phone numbers from a US number (+1), you should register. International numbers have different rules — check Twilio's documentation for your country.
No. A2P 10DLC only applies to SMS. If you only use voice calling, you can safely ignore this.
Once your Brand and Campaign are approved by Twilio and the carriers, your messages are sent through a trusted path with higher throughput limits and reliable delivery. The warning in Blueprint Softphone will disappear automatically.
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