What is Programmable Voice API?

Programmable Voice allows developers to easily implement advanced voice and calling features without managing PSTN infrastructure or carrier compliance. With an easy-to-use API, businesses can embed voice calling directly into their app, enabling them to make, receive, manage, monitor and stream audio from live calls. The API supports all major programming languages including PHP, Java, Python, Ruby, and Node.js.

How does Voice Streaming connect to my AI agent?

EnableX Voice Streaming exposes a real-time bidirectional WebSocket audio pipe. Plug any STT, LLM, and TTS — Pipecat, LiveKit, Deepgram, ElevenLabs, OpenAI Realtime, or your own model. EnableX handles the carrier interconnect, latency, and compliance. Sub-200ms round-trip is typical.

What is the cost of using EnableX Voice API?

EnableX Voice APIs follow a pay-as-you-go model — you are charged based on call duration and the destination country. Volume discounts apply at standard tier breaks. Free trial credits let you build and test before committing. See the Voice API pricing page for current per-minute rates.

Programmable Voice API Carrier-grade voice that powers AI agents.

Name: EnableX Voice API
Brand: EnableX

PSTN, SIP, and WebRTC voice with programmable call flows, server-side recording, and a real-time WebSocket pipe ready for STT, LLM, and TTS. The same Voice stack runs your bank’s collections dialer and your AI agent’s audio, in 100+ countries, sub-200ms latency.

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Carrier-grade · 100+ countries · WebRTC + SIP + PSTN · A2P / P2A / P2P · Real-time streaming · 99.95% SLA

EnableX Voice API telephony anatomy: PSTN, SIP, WebRTC carrier reach with codecs, IVR, and PCI-compliant recording

100+ countries

<200ms round-trip

3 channels PSTN · SIP · WebRTC

99.95% uptime SLA

Everything a production voice app needs

Place a call. Receive a call. Build an IVR. Record. Stream to AI. Pay-as-you-use, no platform fee.

Inbound & outbound

Programmable call flows

Place outbound calls and answer inbound numbers with one REST API. Branch on DTMF, speech, or webhook response. No XML dialect to learn.

IVR & routing

Smart IVR + ASR

Build menu-driven or speech-driven IVRs in minutes. Built-in speech recognition for natural-language intent capture. Skill-based routing to agents.

Realtime AI

Voice Streaming for AI

Bidirectional WebSocket audio pipe. Plug Pipecat, LiveKit, Deepgram, ElevenLabs, OpenAI Realtime. Sub-200ms round-trip end-to-end.

Recording

Server-side recording

Mono, dual-channel, and composite recording. Auto-upload to your S3-compatible storage via signed URLs. Encryption at rest. Retention you control.

Conferencing

Conference & bridging

Multi-party voice rooms. Mute, hold, transfer, whisper, barge. Mix human agents with bot participants. Carrier-grade media servers.

Numbers & SIP

Numbers, SIP trunks, masking

Local, mobile, toll-free, and short-code numbers across 100+ countries. SIP trunk BYOC option. Number masking and click-to-call ready.

Built for the voice workloads that move money

BFSI, insurance, healthcare, telco: the verticals where voice is still the channel of record.

BFSI

Collections & reminders

Outbound dialer with answering machine detection, retry logic, and DTMF capture for promise-to-pay flows.

Insurance

Claim status IVR

Self-service IVR for claim updates, premium reminders, and policy lookup. Skill-based handoff to a live agent.

Healthcare

Appointment confirmation

Two-way voice OTP, appointment reminders, and tele-bridging between patients and clinicians on PSTN or app.

Voice AI

AI voice agents

Voice Streaming pipe for STT → LLM → TTS. Connect Pipecat, LiveKit, or your own orchestrator. Sub-200ms.

Telco / SI

White-label voice CPaaS

Run EnableX under your brand. Bill on your invoice. Operator-grade scale across APAC and Middle East.

Logistics

Click-to-call & masking

Connect drivers and customers with masked numbers. Privacy preserved on both sides, recording for dispute resolution.

Spotlight · Voice Streaming

From a phone number to a Voice AI agent, in one stack.

Most CPaaS makes you bolt a voice agent onto someone else’s telephony. We give you both: a carrier-grade Voice API and a real-time WebSocket audio pipe ready for any STT, LLM, and TTS.

Bidirectional WebSocket audio: raw PCM or Opus, your choice.
Drop-in compatibility with Pipecat, LiveKit Agents, Deepgram, ElevenLabs, Cartesia, and OpenAI Realtime.
Sub-200ms round-trip on tier-1 routes: the difference between “feels human” and “feels like a bot.”
Carrier interconnect, DTMF, recording, and CDR handled by EnableX. You focus on the agent.
On-premise deployment for sovereign AI and regulated voice workloads.

Voice Streaming docs → Or: managed Voice AI

Why EnableX Voice API vs Twilio, Vonage, or Plivo

Three things the messaging-first CPaaS players cannot match for voice.

Full-stack: Voice + Video + Messaging

One platform, one bill. Most messaging-first CPaaS never built carrier-grade voice or real video. EnableX runs all three.

On-prem & hybrid voice

The only CPaaS that ships voice behind your firewall. Required under DPDPA, RBI, IRDAI, HIPAA-grade, and sovereign-AI mandates.

White-label for telcos & SIs

Run EnableX Voice under your brand. Bill on your invoice. EnableX is the engine: invisible. Operator-grade across APAC and Middle East.

Built for voice in

BFSI · Collections, IVR, OTP Insurance · Renewals & verification Healthcare · Telehealth platforms Telco · White-label CPaaS Voice AI · Production agents

Pricing

Pay-as-you-use voice. No platform fee.

Per-minute on PSTN, SIP, and WebRTC. Real-time streaming priced separately. Volume discounts kick in automatically. Free trial, no credit card required.

Start free trial See full Voice pricing →

Voice / minuteFrom $0.0085

Voice StreamingFrom $0.012/min

RecordingFrom $0.0008/min

Local DID numberFrom $1/month

Voice API FAQs

Programmable Voice lets developers add advanced calling features to their app without managing PSTN infrastructure or carrier compliance. With one easy-to-use REST API and SDKs in PHP, Java, Python, Ruby, and Node.js, you can make calls, receive calls, route them, record them, and stream live audio for AI processing.

WebRTC is the open real-time communication standard browsers and mobile apps use to stream audio and video peer-to-peer with sub-second latency. The EnableX Voice API is built on WebRTC, delivering high-quality, low-latency calls across web, mobile, and PSTN endpoints with no plug-ins required.

Voice Streaming exposes a real-time bidirectional WebSocket audio pipe. Plug any STT, LLM, and TTS: Pipecat, LiveKit, Deepgram, ElevenLabs, Cartesia, OpenAI Realtime, or your own model. EnableX handles the carrier interconnect, latency, and compliance. Sub-200ms round-trip is typical on tier-1 routes.

Pay-as-you-go on per-minute rates that vary by destination country and call type. Volume discounts apply at standard tier breaks. Recording, streaming, and number rental are priced as add-ons. Free trial credits are included. See the Voice API pricing page for current rates.

EnableX is full-stack: Voice, Video, and Messaging on one platform with one bill. Unlike Twilio and Vonage, EnableX ships an on-premise deployment for regulated buyers (banks, insurers, healthcare, government) and offers white-label for telcos and system integrators. For APAC and Middle East buyers, EnableX is typically the stronger choice on price, support, and compliance posture.

Yes. EnableX is one of the only CPaaS platforms that ships a true on-premise voice deployment: full stack inside your data centre. Critical under DPDPA, RBI, IRDAI, HIPAA-grade, and sovereign-AI requirements. Cloud, hybrid, and air-gapped options are also available.

It is built for collections, IVR, OTP voice fallback, and outbound campaigns in banking and insurance; appointment confirmation and telehealth bridging in healthcare; white-label telephony for telcos and SIs; and Voice Streaming for production voice agents.

Self-serve developers get API keys in 2 minutes and ship a working call flow in a day. Enterprise voice deployments with number provisioning and IVR go live in 2-4 weeks. On-premise deployments take 6-12 weeks depending on the security review.

Build it: developer docs

Voice API overview → Voice API → Media Streaming API → Broadcast API →

See EnableX in action.

Talk to sales, or start a free trial. No credit card required.

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Free trial credits · No credit card · API keys in 2 minutes