Guide: How Enterprises can Block Spoofed Calls Before They Reach Customers

When a scammer spoofs your enterprise’s outbound numbers, your customers face fraud and your brand takes the blame. SENTRY® Call Blocking authenticates each outbound call in real time, so calls without a valid key are blocked before they reach consumers. It works across all major U.S. carriers and matters most for industries often targeted by impersonation fraud, including financial services, healthcare, and insurance.

In this guide, you’ll learn:

  • How SENTRY authenticates calls. First Orion generates a time-limited key for each call and shares it with the carrier network. Calls with a valid key are delivered, and calls without one are blocked.
  • What SENTRY protects. SENTRY helps prevent costly fraud incidents, protect your brand reputation, increase agent productivity, and keep customers safe from bad actors.
  • The three steps to get started. Complete free Business Number Registration, have each number vetted to establish Right of Use, and choose an API or SIP integration.
  • How long activation takes. Implementation takes about 4 to 6 weeks after successful integration with Call Authentication. Each carrier sets its own requirements, including monitoring periods of up to 21 days.
  • What reporting shows. Track authentication requests, blocked calls, and blocked rate, then export the data to CSV or Excel and filter by business unit, program, or date range.
Download the guide
First Orion wins Gold in the 2026 Merit Technology Awards for Regulatory Tech and Fraud Prevention.
November 10, 2026

First Orion Wins Gold in 2026 Merit Technology Awards

First Orion has won Gold in the Regulatory Tech (RegTech) & Fraud Prevention category of the 2026 Merit Technology Awards, recognizing its integrated approach that combines verified business identity, call authentication, and network-based spoof protection.
Read More
First Orion ENRICH Branded Messaging named "Telecommunications Solution of the Year" in the 10th annual Mobile Breakthrough Awards.
October 22, 2026

First Orion ENRICH Wins Mobile Breakthrough Award

First Orion’s ENRICH Branded Messaging has been named “Telecommunications Solution of the Year” in the 10th annual Mobile Breakthrough Awards, recognizing its verified-identity RCS messaging for businesses.
Read More
October 13, 2026

First Orion Launches Free Spam Watchlist

First Orion launched Watchlist within its free Business Number Registration service, letting registered businesses see whether their numbers have been tagged as Potential Spam on the T-Mobile network and view the calling behaviors behind the tag.
Read More