Keep unwanted calls out

Call screening for secure call management

With Sinch Voice API, you can screen every incoming call in real time. Block spam, fast-track VIPs, and automate call flows with over 99.95% availability across five AWS regions.

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

WHAT IS CALL SCREENING?

Smarter call screening to block spam and improve customer experience

Call screening uses real-time webhooks and your rules to filter unwanted calls, prioritize important ones, and route everything automatically—no manual intervention required.

Block spam and fraud calls

Filter suspicious or unwanted calls in real time before they ring, keeping your team and customers free from disruption.

Prioritize VIP customers

Quickly spot high-value customers instantly and connect them with the best agent or IVR flow to boost satisfaction and loyalty.

Automate smart routing

Set up rules to direct each call based on data, time, or capacity, cutting out manual transfers and reducing wait times.
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RULE-BASED CONTROL 

Real-time call interception and control

Get total control over incoming calls with Inbound Call Event (ICE) webhooks. Approve, reject, or reroute calls before the phone even rings. 

  • Decide call flow before connection

  • Instantly block, reroute, or modify calls 

  • Keep caller experience smooth 

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CUSTOM LOGIC FLEXIBILITY 

Apply your own rules and security checks

Use your databases, CRM tags, or time-based rules to create custom call screening flows that match your business needs and compliance requirements. 

  • Query internal systems in milliseconds 

  • Apply dynamic, time-based routing logic 

  • Enforce custom security protocols

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CALL ROUTING EFFICIENCY 

Automate call routing and reduce manual workload

Instantly route callers to the right department or agent, freeing staff from repetitive tasks so customers reach the right person or IVR on the first try.

  • Eliminate manual transfers and hold times 

  • Balance workloads across teams 

  • Improve customer satisfaction scores 

REAL-WORLD USE CASES 

How businesses use call screening 

Spam & fraud filtering 

Limit robocalls, vishing, and other malicious traffic before it reaches employees to keep your brand and resources safe. 

VIP customer routing 

Identify loyal or high-value customers and connect them directly to top agents or personalized IVR flows for premium service. 

Business hours logic 

Automatically route calls based on time and day, sending after-hours traffic to voicemail, on-call staff, or alternative numbers. 

Interactive screening 

Prompt callers with automated challenges to figure out why they’re calling, adding an extra layer of protection against unwanted calls. 

POWERFUL FEATURES

Everything you need for smarter call screening 

Inbound Call Event (ICE) webhook 

Get real-time notifications for every incoming call to trigger instant action. 


SVAML/JSON call control 

Use instructions to control calls by approving, rejecting, forwarding, or modifying them in real time. 

Answering Machine Detection (AMD) 

Detect if a human or machine answers and adjust the call flow instantly. 

Secure webhook authentication 

Only authorized systems can access and act on your call events. 


Rich caller data

Access detailed caller information to create smarter routing and security checks. 



Configurable fallbacks 

Set backup behaviors to keep calls flowing even if primary services go down. 




Real-time decision making

Handle events instantly to reduce delays and keep customers happy. 




Global phone number support 

Screen calls on numbers available in over 70 countries, backed by an enterprise-grade voice network. 

Frequently asked questions about call screening 

When a Sinch number receives a call, the Programmable Voice API sends an Inbound Call Event (ICE) webhook to your URL. Your application responds with SVAML or JSON to control the call’s outcome in real time. 

Configurable fallbacks let you preset backup behaviors. Even during outages, calls are handled gracefully so customers are never left waiting. 

Yes. Your webhook can query any internal or external data source, then use that information to accept, block, or route the call. 

You need a Sinch developer account, a Sinch virtual phone number, and a publicly accessible web server to host your webhook application. 

Yes. Sinch is ISO 27001 certified, GDPR-compliant, and built on a secure, cloud-native foundation. 

Talk to an expert about call screening via our Voice API

Learn how to use our Voice API to screen callers, verify identities, and route every call to the right place—reducing fraud, blocking spam, and delivering better customer experiences.