CALL STREAMS

Stream live call audio to your AI system

Access the Next Generation Voice API with Sinch Call Streams. Seamlessly stream audio to your backend systems, allowing you to integrate your preferred AI models and engines to power real-time voice assistants, live transcription, voice biometrics, sentiment detection, speech analytics, and bidirectional language translation with sub-100ms responsiveness. 

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AT A GLANCE 

Give your AI sub-100ms access to every caller’s voice

Call Streams removes media barriers between telephony and AI. With real-time call audio streaming via WebSockets, you can send and receive raw audio in real time, respect caller interruptions automatically, and plug any speech or analytics engine into the flow.

Real-time AI responses

Connect calls to LLMs in sub-100 ms so conversations flow naturally with no awkward delays or clipped turn-taking.

Unrestricted audio control 

Stream audio continuously in and out, giving your system full control to detect speech and trigger instant playback interruptions. 

Flexible bring-your-own stack

Pipe raw audio to any STT, TTS, biometrics, or analytics service so you can mix and match the best tools for every task.

REAL-TIME AI INTEGRATION 

Connect voice calls directly to LLMs with sub-100ms latency

Call Streams delivers full-duplex audio over WebSockets so your AI hears and speaks almost instantly. Callers experience human-like pacing instead of multi-second pauses, creating natural conversations that keep them engaged.

  • Sub-100 ms latency for audio delivery to your backend

  • Full-duplex audio for continuous bidirectional streaming

  • Vendor-agnostic

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BARGE-IN HANDLING

Let callers interrupt while the AI listens without delay

Sinch constantly captures and listens to the customer’s audio, and will only terminate or discard the played audio when an interrupt command is received from your system. This means users can speak freely without being talked over, creating a more natural conversational flow.

  • Discards played audio on interruption command from your system

  • Powerful but easy-to-use foundation

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EXPLORE USE CASES

What teams build with Call Streams

Voice AI agent  

Build low-latency, human-like conversations between callers and AI systems that can handle support, routing, or sales tasks live.

Real-time sentiment 

Analyze caller emotions and intent as they speak to trigger dynamic routing, escalation, or post-call actions instantly.

Fraud detection  

Monitor risk signals and voice biometrics in real time to spot fraud patterns and stop threats before they escalate. 

Live QA & compliance  

Stream audio to monitoring tools for immediate quality assurance and regulatory compliance checks while the call is in progress. 

GREAT FEATURES

Everything you need to bridge telephony and AI

Bidirectional audio

Full-duplex streaming over WebSockets lets the caller and your AI talk and listen at the same time.

Low-latency control

Sub-100 ms responsiveness keeps dialog fluid and delivers near-instant conversational turns. 

Multi-stream support  

Handle multiple concurrent audio streams to power large-scale voice applications. 

Vendor-agnostic design 

Integrate your preferred STT, TTS, sentiment, or fraud engines with no proprietary constraints. 

Real-time call intelligence 

Trigger insights, routing, or agent assist actions while the caller is still on the line. 

FAQ

Frequently asked questions

Streams sends live call audio to your system over WebSockets so you can connect voice calls to AI agents or real-time analytics. With Streams, open a direct, two-way telephone line between the caller and your AI system to reduce response delay.

It’s a bidirectional media connection that lets audio flow to and from your AI in real time, enabling instant responses, live transcription, and analytics while the call is in progress.

Streams continuously captures audio and performs barge-in only when it receives an interrupt command from your system.

Stream delivers raw audio as it’s spoken, creating low-latency, real-time control so AI can respond naturally without waiting for a full utterance or post-call processing.

Common use cases include connecting voice-powered AI agents to calls and running real-time call analysis such as sentiment detection and other live monitoring or automation.

You need a Sinch Build account with Voice API and a secure WebSocket endpoint where your AI or analytics service will receive and send audio.

Yes. Streams is vendor-agnostic, so you can integrate your preferred services for speech-to-text, text-to-speech, sentiment, biometrics, and fraud detection.

Yes. Streams is delivered as part of the Sinch Programmable Voice platform, inheriting its reliability and compliance.