Browse our Call Protection APIs

This portfolio includes two complementary products:

  • Brand Call Protect API – Protects outbound enterprise calls.
  • Inbound Call Verify API – Protects inbound calls to toll-free numbers.

Together, these products create a holistic defense against spoofing and fraud in voice communications.

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Brand Call Protect API

Safeguard outbound calls with advanced authentication and blocking that reinforces trust and protects your brand. Deliver a secure customer experience by reducing risks of impersonation and fraud.



Outbound Protection: Ensures only authenticated calls reach subscribers.

Spoofing Defense: Prevents unauthorized use of enterprise numbers.

Consumer Confidence: Spoofed calls will be blocked before terminating to customers.

Inbound Call Verify API

Verify inbound calls with real-time network intelligence to prevent spoofing and fraud. Enhance consumer trust by validating call origin and ensuring secure communication across your customer.



Live Call Authentication: 30-second look back to validate active calls.

Recent Call Confirmation: 30-minute look back to verify recent sessions.

Inbound Protection: Validates that customers calling enterprise toll-free lines are legitimate.

Fraud Detection: Identifies consumer impersonation attempts.

Verify and trust every inbound and outbound voice communications.

FAQs

What is T-Mobile's Call Protection and how does it work?
  • T-Mobile Call Protection uses network-level intelligence to authenticate inbound and outbound voice communications before they reach your customers. By verifying call origin at the carrier level—rather than relying on device-side filters—it stops spoofed and fraudulent calls from getting through in the first place, with no additional hardware or software required on the customer's end.
How does T-Mobile Call Protection help prevent call spoofing and fraud?
  • The APIs apply network verification at the carrier layer, so calls that can't be authenticated are flagged or blocked before reaching the recipient. Spoofing defense prevents unauthorized use of enterprise numbers, while fraud detection identifies consumer impersonation attempts in real time. This means bad actors posing as customers can be caught at the start of an interaction rather than discovered after damage is done.
What industries benefit most from Call Protection APIs?
  • Any industry relying heavily on voice as a customer engagement channel benefits, but the impact is especially significant in financial services (preventing account takeover via phone fraud), retail and e-commerce (protecting branded outbound notifications), healthcare (verifying patient-facing calls), and insurance (confirming caller identity during claims intake). Essentially, if your customers receive or place calls with your business, Call Protection adds a layer of trust that improves both security and experience.
What is the difference between Brand Call Protect and Inbound Call Verify?
  • Brand Call Protect focuses on outbound calls. It ensures that only authenticated calls from your enterprise reach customers, protecting your brand from spoofing and impersonation. Inbound Call Verify focuses on inbound traffic to toll-free numbers, verifying the origin of a call in real time so your contact center can trust that the person on the line is who they claim to be. Together, the two APIs provide end-to-end voice call integrity.
What is the difference between Branded Calling and Brand Call Protect?
  • They solve different problems and work best together. Branded Calling is about visibility. It displays your preferred business number, business name, and reason for calling on the recipient's screen so customers immediately know who's reaching out and why. Brand Call Protect is about security. It blocks calls that weren't authorized by your organization, stopping bad actors from impersonating your brand before a call ever rings through.
What is T-Mobile's Call Protection and how does it work?
  • T-Mobile Call Protection uses network-level intelligence to authenticate inbound and outbound voice communications before they reach your customers. By verifying call origin at the carrier level—rather than relying on device-side filters—it stops spoofed and fraudulent calls from getting through in the first place, with no additional hardware or software required on the customer's end.
What is the difference between Brand Call Protect and Inbound Call Verify?
  • Brand Call Protect focuses on outbound calls. It ensures that only authenticated calls from your enterprise reach customers, protecting your brand from spoofing and impersonation. Inbound Call Verify focuses on inbound traffic to toll-free numbers, verifying the origin of a call in real time so your contact center can trust that the person on the line is who they claim to be. Together, the two APIs provide end-to-end voice call integrity.
How does T-Mobile Call Protection help prevent call spoofing and fraud?
  • The APIs apply network verification at the carrier layer, so calls that can't be authenticated are flagged or blocked before reaching the recipient. Spoofing defense prevents unauthorized use of enterprise numbers, while fraud detection identifies consumer impersonation attempts in real time. This means bad actors posing as customers can be caught at the start of an interaction rather than discovered after damage is done.
What is the difference between Branded Calling and Brand Call Protect?
  • They solve different problems and work best together. Branded Calling is about visibility. It displays your preferred business number, business name, and reason for calling on the recipient's screen so customers immediately know who's reaching out and why. Brand Call Protect is about security. It blocks calls that weren't authorized by your organization, stopping bad actors from impersonating your brand before a call ever rings through.
What industries benefit most from Call Protection APIs?
  • Any industry relying heavily on voice as a customer engagement channel benefits, but the impact is especially significant in financial services (preventing account takeover via phone fraud), retail and e-commerce (protecting branded outbound notifications), healthcare (verifying patient-facing calls), and insurance (confirming caller identity during claims intake). Essentially, if your customers receive or place calls with your business, Call Protection adds a layer of trust that improves both security and experience.

How to get started

Submit your interest through the program access lead form.
A member of our Business Development team will review your information and reach out to discuss your goals and next steps.
If there's mutual interest in moving forward, you'll receive an NDA to formalize the engagement.
Once the NDA is signed, you will be granted access to the relevant materials or prompts to proceed.
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Contact us for specific questions, pricing information or for support in getting started.