TAKE ACTION TO STOP VISHING 

Smart, multi-layered protection for every call 

Keep your finances, reputation, and services safe. Sinch uses advanced fraud detection, authentication, encryption, and caller ID verification in our voice products, so your business stays ahead of evolving threats. 

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Join over 150,000 businesses, including 8 of the 10 largest tech companies in the world

WHAT SETS US APART 

Security woven into every Sinch voice product 

With Sinch, protection isn’t an add-on—it’s built in. Our fraud detection combines authentication, encryption, and caller ID verification directly within Elastic SIP Trunking and the Programmable Voice API. That means your data, revenue, and customer trust are protected from unauthorized access and fraud. 

Stop expensive toll fraud

Block unauthorized calls with mandatory IP Access Control Lists (ACLs) or Digest Authentication so only trusted endpoints can connect. 

Defeat caller spoofing

No more spoofing scams: digitally signed caller IDs via STIR/SHAKEN let your customers know it’s really you calling. 

Encrypt every conversation

End-to-end SRTP/TLS encryption keeps your voice data private and compliant with global security standards. 
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PROTECT YOUR FINANCES 

Stop toll fraud and keep your budget safe 

Voice fraud can be expensive—and can happen in an instant. Sinch uses IP Access Control Lists and Digest Authentication, so only approved traffic reaches your SIP trunks, stopping fraudulent calls and keeping your business up and running. 

  • Whitelist trusted IP addresses with ACLs 

  • Require credentials through Digest Authentication 

  • Stop budget-draining unauthorized calls 

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BOOST BRAND TRUST 

Build trust with verified calls 

Spoofing can damage your brand and hurt customer confidence. With Sinch’s STIR/SHAKEN compliance, your calls are digitally signed, so customers know it’s really you. They won’t have to worry about vishing scams, which restores trust in your business. 

  • STIR/SHAKEN compliant across participating networks 

  • Restores confidence in answered calls 

  • Meets FCC caller ID verification rules 

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PRIVACY & COMPLIANCE 

Keep conversations private and secure 

Your customers count on you to protect their information, and you need the right fraud detection and privacy controls to make it happen. Sinch supports SRTP for media and TLS for signaling, keeping communications confidential and compliant. 

  • SRTP protects voice media in transit 

  • TLS secures SIP signaling data 

  • Protects against eavesdropping and tampering 

REAL-WORLD USE CASES 

How businesses use Sinch Voice fraud detection 

Securing enterprise communications 

Protect PBXs and contact centers via Elastic SIP Trunking secured by IP ACLs or Digest Authentication to block unauthorized access. 

Safeguarding financial transactions 

Encrypt in-app or support calls with SRTP/TLS and verify caller IDs with STIR/SHAKEN to stop vishing. 

Protecting privacy in on-demand services 

Use Number Masking to anonymize phone numbers in ridesharing, delivery, or healthcare apps to stop off-platform contact and lost revenue. 

Protecting contact center operations 

Combine DDoS protection and real-time monitoring to spot unusual call patterns early and keep high-volume centers online. 

FEATURES THAT JUST WORK 

Layered protection that adapts to new threats 

IP Access Control Lists (ACLs) 

Whitelist trusted IP addresses so only approved networks can connect. 

Digest authentication 

Add a second layer of protection with required credentials for every SIP request. 


SRTP/TLS encryption 

End-to-end encryption keeps your media streams and signaling fully secure, safeguarding confidentiality and integrity. 

STIR/SHAKEN compliance 

Digitally signs caller IDs to prevent spoofing and help customers trust your calls.

 

DDoS protection 

Built-in network safeguards protect your uptime, even during malicious attack attempts. 


Real-time visibility and debugging 

Spot and stop unusual calls before they become a problem with dashboard analytics. 

Call masking (number masking) 

Anonymizes user phone numbers in in-app calls for more private communications.

Network redundancy 

Multiple routes and backups keep voice services running smoothly, no matter what. 


Frequently asked questions about Sinch Voice fraud detection 

Sinch Elastic SIP Trunking blocks unauthorized access with strict controls. You can configure IP Access Control Lists (ACLs) to only allow traffic from your designated IP addresses or use Digest Authentication which requires a username and password for all traffic. This stops unauthorized parties from making expensive calls through your SIP trunk. 

Sinch complies with the STIR/SHAKEN framework, which allows caller ID information to be digitally signed and verified. This makes it significantly harder for fraudsters to impersonate your business, helping consumers trust calls from legitimate numbers on the public telephone network. 

Yes, Sinch supports SRTP (Secure Real-time Transport Protocol) for encrypting voice media and TLS (Transport Layer Security) for encrypting call signaling. 

Multi-layered security is part of everything we build. Sinch combines DDoS protection, STIR/SHAKEN compliance, granular IP ACLs, Digest Authentication, and SRTP/TLS encryption for comprehensive defense. 

Yes. The Programmable Voice API includes Number Masking, to anonymize user numbers. This boosts privacy and helps prevent lost revenue from off-platform contact. 

Yes. Sinch’s network is designed with DDoS protection to resist and absorb malicious traffic spikes, keeping your voice services stable and reliable. 

Talk to an expert about voice fraud detection

Learn how to block toll fraud, stop spoofing, and keep every call secure with built-in authentication, encryption, and real-time monitoring from Sinch.