Voice · Streaming The real-time audio pipe for production voice AI.

Fork live call audio over WebSocket to your STT, LLM, and TTS, with sub-200ms round-trip. Drop-in compatible with Pipecat, LiveKit Agents, Deepgram, ElevenLabs, Cartesia, and OpenAI Realtime. Same telephony format as Twilio Media Streams, but with on-prem deployment, Indian-language ASR, and the EnableX AI Voice Agent ready when you want managed.

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Sub-200ms · WebSocket · Bidirectional · Pipecat / LiveKit / Deepgram / ElevenLabs / OpenAI Realtime · On-prem ready
EnableX Voice Streaming API for real-time audio streaming between telephony, speech-to-text, AI models, and text-to-speech services
<200ms round-trip
Bidirectional WebSocket
11+ Indian languages ASR
On-prem or cloud

Everything a production voice AI agent needs

Stream audio. Plug your STT, LLM, TTS. Or hand off to the managed EnableX AI Voice Agent. Both paths first-class.

Pipe

Bidirectional WebSocket

Receive caller audio. Send synthesised audio back. Both directions, base64-encoded mu-law 8 kHz mono: same format as Twilio Media Streams.

Latency

Sub-200ms round-trip

Tier-1 routes deliver end-to-end round-trip under 200ms. The difference between an agent that "feels human" and one that "feels like a bot."

Stack

Pipecat · LiveKit ready

Drop-in compatible with Pipecat, LiveKit Agents, Deepgram, ElevenLabs, Cartesia, OpenAI Realtime, Google Gemini Live. Plug your stack, we move the audio.

ASR

Indian-language ASR built in

95%+ accuracy across Hindi, Tamil, Telugu, Marathi, Bengali, and Hinglish. Powered by the IIT Madras IndicVoices dataset.

Sources

PSTN, SIP, WebRTC sources

Stream from inbound PSTN calls, SIP trunks, or WebRTC sessions. Same WebSocket endpoint, same payload format.

Deployment

Cloud, hybrid, on-prem

Run inside your datacentre for sovereign AI and BFSI voice biometrics. Required under DPDPA, RBI, IRDAI, and HIPAA-grade workloads.

What teams build with Voice Streaming

From a phone number to a production voice AI agent, in days, not quarters.

Voice AI

AI voice agents

STT → LLM → TTS pipelines that handle inbound and outbound calls end-to-end. Pipecat, LiveKit, or your own orchestrator.

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BFSI

Voice biometrics & auth

Verify caller identity in the first few seconds of a call. On-prem deployment keeps voiceprints inside your data centre.

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Insurance

Real-time call analytics

Live transcription, sentiment, intent, and compliance scoring as the call happens, not hours later from recordings.

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Healthcare

Tele-triage with AI

Stream patient calls to clinical NLP for symptom triage, appointment routing, and structured EHR capture. HIPAA-grade controls.

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Contact centre

Supervisor whisper & coaching

Live listen-in, real-time keyword alerts, AI-suggested next-best-utterance. Reduce escalation rate by surfacing risk in the moment.

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Compliance

Real-time recording & archive

Stream both legs to your archive in real time. Encryption in transit and at rest. Retention rules per region.

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Spotlight · Real-time WebSocket pipe

Sub-200ms. Bidirectional. Production-grade.

Most CPaaS bolts a streaming applet onto a legacy voice stack and calls it a day. We built the pipe for what voice AI actually needs: bidirectional, low-jitter, reconnect-safe, with hooks into the EnableX AI Voice Agent if you want managed instead of DIY.

  • Base64 mu-law 8 kHz mono: the same telephony format your ASR engine already speaks.
  • Bidirectional: receive caller audio, send synthesised audio back. Pipecat, LiveKit Agents, OpenAI Realtime supported out of the box.
  • Sub-200ms round-trip on tier-1 routes: the threshold where conversation feels natural.
  • EnableX handles WebSocket reconnect, sequencing, clock-sync, and DTMF eventing; you focus on the agent.
  • On-prem deployment for sovereign AI, BFSI voice biometrics, and HIPAA-grade workloads.
Voice Streaming docs → Or: managed AI Voice Agent

Why EnableX Voice Streaming vs Twilio, Plivo, or Exotel

Three things the messaging-first CPaaS players cannot match for voice AI in regulated industries.

01

On-prem & sovereign-AI ready

Deploy inside your datacentre or in-region private cloud. Required for BFSI voice biometrics, sovereign AI mandates, and DPDPA / HIPAA workloads. Twilio is cloud-only.

02

Indian-language ASR built in

95%+ on Hindi, Tamil, Telugu, Marathi, Bengali, Hinglish: built on the IIT Madras IndicVoices dataset. Beats global ASR engines on India-language calls.

03

DIY pipe + managed AI Agent

Use the WebSocket directly with your stack, or hand off to the managed EnableX AI Voice Agent: same platform, same billing. Both paths supported.

Built for voice streaming in
Voice AI builders · Production agents BFSI · Voice biometrics Insurance · Real-time analytics Healthcare · Tele-triage Contact centre · Supervisor coaching
Pricing

Pay-as-you-stream. No platform fee.

Per-minute streaming on top of voice minutes. Bidirectional priced once. Volume discounts kick in automatically. Free trial credits included, no credit card required.

See full pricing → Start free trial
Voice StreamingFrom $0.012/min
Bidirectional add-onIncluded
EnableX ASR (Indic)From $0.008/min
On-prem deploymentCustom

Voice Streaming API FAQs

A voice streaming API lets you fork the raw audio of a live phone call and stream it in real time over a WebSocket, to a speech-to-text engine, an AI voice agent, a sentiment-analysis service, or a supervisor dashboard. Unlike call recording (which gives you an audio file after the call ends), voice streaming delivers the audio as it happens, with latency measured in hundreds of milliseconds.

The EnableX Voice Streaming API forks the raw audio of any voice call on the EnableX platform and streams it over a WebSocket to a destination you specify: your transcription engine, AI voice agent, analytics pipeline, or your own application. It integrates directly with the EnableX AI Voice Agent and the Dialogs Conversational AI Platform.

When a call is placed, EnableX opens a WebSocket connection to your URL, streams base64-encoded audio frames as the call progresses, and closes the socket when the call ends. Control messages (call started, ended, DTMF) travel on the same socket. EnableX handles reconnection, sequencing, and clock sync.

Base64-encoded mu-law (ulaw) at 8000 Hz mono: the same telephony-grade format as Twilio Media Streams, compatible with Google Speech-to-Text, Deepgram, AWS Transcribe, Azure Speech, OpenAI Whisper. Both directions use the same format.

Yes. Bidirectional streaming is supported, so your WebSocket application can both receive caller audio and send audio back to be played on the call. This is what enables AI voice agents, conversational IVR, and real-time voice assistants.

Yes. Stream the audio to Google Speech-to-Text, Deepgram, AWS Transcribe, Azure Speech, OpenAI Whisper, ElevenLabs, or any ASR engine, or use EnableX's built-in speech-to-text, which supports 95%+ recognition accuracy across Indian languages using the IIT Madras IndicVoices dataset.

Yes. Raw streamed audio can be fed to a voice-biometrics engine to verify caller identity in the first few seconds of a call, useful for banking IVR, high-value support, and fraud prevention in BFSI. On-premise deployment keeps voiceprints inside your data centre for regulated buyers.

Yes. Fork the audio of an agent call into a supervisor dashboard for live listen-in, live transcription with keyword alerts, or AI-driven whisper coaching. Because EnableX streams both sides of the call, you can surface sentiment, escalation risk, and compliance violations in real time.

The EnableX AI Voice Agent is built on top of the Voice Streaming API. For a managed, turnkey voice AI experience, you configure the AI Voice Agent and EnableX handles the WebSocket, ASR, LLM, and TTS stack end-to-end. Use the streaming API directly when you want your own LLM, ASR, or TTS in the loop.

Both stream raw audio over WebSocket with bidirectional support. Choose EnableX if you need on-premise deployment, Indian-language ASR built in, integrated AI Voice Agent, or a single vendor for Voice + WhatsApp + Video + Conversational AI. Choose Twilio if you need US-centric cloud and a mature developer ecosystem.

Plivo Audio Streaming is a solid WebSocket audio-forking service with bidirectional support and a similar telephony-grade audio format. EnableX offers the same streaming capability plus full-stack CPaaS, on-premise deployment for regulated industries, and built-in Indian-language ASR.

Sign up for an EnableX account, enable Voice Streaming in the console, generate an API key, and point your WebSocket endpoint URL in the call configuration. Working samples are available in the Developer Docs. Most developers have a bidirectional proof-of-concept running in under a day.

Build with Voice Streaming API: Developer Docs

Media Streaming Guide → Voice API Reference → Error Codes →

See EnableX in action.

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