Campaign Service Provider (CSP)
Your CSP is whoever files your 10DLC paperwork with TCR — usually your messaging platform. Campaigns are not portable between CSPs.
The Campaign Registry does not accept registrations directly from most businesses. Instead, CSPs — messaging platforms vetted by TCR — file brands and campaigns for their customers and relay carrier review results.
When you complete an A2P wizard inside Twilio, GoHighLevel (LeadConnector), Klaviyo, or HubSpot, that platform is acting as your CSP (or reselling another CSP's connectivity).
The CSP relationship matters operationally: your campaign lives with your CSP. Switching platforms means re-registering campaigns, and CSPs bear carrier pressure for their customers' behavior, which is why they enforce opt-in evidence requirements strictly.
Frequently asked questions
Related glossary terms
10DLC (10-Digit Long Code) is the US carrier-mandated framework for sending Application-to-Person SMS from local 10-digit numbers, requiring brand and campaign registration with The Campaign Registry.
Campaign registration is the process of submitting a specific SMS use case (Marketing, Customer Care, 2FA, etc.) to The Campaign Registry for carrier approval.
Brand registration is the TCR process of vetting a sending business against its IRS records (legal name + EIN) before any 10DLC campaign can be submitted.