Definition: CSP (Campaign Service Provider) is a company that uses The Campaign Registry to register brands and messaging campaigns on behalf of businesses.

You fill out forms with your provider. Your provider, acting as the CSP, turns those forms into brand and campaign records in TCR. From there, the records move toward the carriers through connectivity partners.

Where does the CSP fit in the chain?

Based on TCR's October 2025 guide, the path looks like this:

1. Brand (your business) gives details to the CSP.
2. CSP registers the brand and campaign in TCR.
3. CNP or DCA (connectivity partners) connect the CSP to carrier networks.
4. MNO (the carrier, such as AT&T or T-Mobile) handles the traffic.

Why do CSPs have different rules?

Each provider adds its own checks and fees on top of TCR. A few examples from provider docs:

• Twilio made privacy policy and terms URLs required for new API campaign submissions from June 30, 2026.
• Vonage requires external vetting for most campaign types, except Low Volume Mixed and Sole Proprietor.
• Twilio says an ISV (a software platform) should register the actual sender, not its own details.

Why it matters for your website

Your CSP submits your website, privacy policy, and terms URLs for review. Twilio flags an ISV using its own platform site instead of the customer's site (error 30907). Your site should belong to the business sending the texts. See our guide for any provider.

Related terms: TCR, Brand vetting, Campaign use case

Sources

• The Campaign Registry: CSP User Guide (October 2025)
• Twilio Error 30894: Invalid brand information
• Twilio changelog: campaign registration will require privacy policy and terms URLs
• Twilio Error 30922: Website does not meet campaign verification requirements
• Twilio Error 30907: Website URL validation issue
• Telnyx: 10DLC Campaign Compliance Guide
• Vonage: 10DLC Pricing and Fees

Whatever provider you use, you can check your site for free with our compare your site with the checklist.