Voice AI Telephony — SIP, PSTN, WhatsApp Plug voice AI into your existing telephony.

PSTN, SIP, WebRTC, WhatsApp Voice: one stack, any channel. You don't need to rip out your contact centre. EnableX Voice AI integrates with the carrier, SIP trunk, or PBX you already have, and adds the AI agent layer on top.

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PSTN · SIP · WebRTC · WhatsApp Voice · No PBX rip-and-replace · Carrier-grade
🔗 SIP trunks
Carrier-grade enterprise. Bring your own trunk or use ours. SIP-over-TLS supported.
🌐 WebRTC
In-app voice for mobile and web. No phone number needed.
💬 WhatsApp Voice
Customers tap to call inside the WhatsApp thread. Same agent.
🎤 WebSocket Media StreamingFOR BUILDERS
Bidirectional raw audio over WebSocket. Bring your own STT, LLM, TTS; EnableX handles the call.

Global telephony, strongest where it matters most

Voice AI is only as good as the telephony underneath it. EnableX gives you global virtual numbers, carrier-grade SIP, and regulator-ready compliance on every continent, with the densest infrastructure across APAC and the Middle East, where most US-first voice AI vendors fall short.

Global · 70+ countries

Local-presence virtual numbers, toll-free, mobile, and landline ranges in every major market: North America, Europe, LATAM, Africa, and Asia. Self-service provisioning, number porting, and STIR/SHAKEN where applicable.

Asia-Pacific stronghold

Singapore-headquartered, with direct interconnects across India, Indonesia, Malaysia, Philippines, Vietnam, Thailand, and Singapore. Per-country regulator compliance (TRAI / DND in India, PDPA in Singapore, NPC in the Philippines) handled at the platform level.

Middle East depth

UAE, KSA, Bahrain, Kuwait, Qatar, Oman, Egypt. Carrier-grade interconnects, Arabic-region number ranges, KSA NDMO and UAE TDRA compliance, on-premise deployment available in KSA for sovereign workloads.

What enterprise teams actually get on EnableX telephony

Four things that decide whether a voice agent works in production: quality, regulator-readiness, number authenticity, and flexibility. EnableX ships them on every call, in every market.

Quality

Sub-2-second mouth-to-ear, on every continent.

Regional points-of-presence keep media latency low. Codec-aware transcoding (G.711, G.722, Opus) preserves voice quality across IP, PSTN, and mobile networks. MOS-validated audio paths. Auto-failover between carriers when a route degrades.

  • Sub-2-second response latency, end-to-end
  • Regional POPs across APAC, ME, EU, NA
  • G.711, G.722, Opus, transcoding included
  • Real-time route-quality monitoring + auto-failover
Compliance

Regulator-ready out of the box.

The regional rules that block most voice AI deployments are baked into the platform, not your problem to wire up. Calling-window enforcement, DND list scrubbing, header registration, consent capture, recording retention: all handled before the call leaves our SIP.

  • India: TRAI DND, RBI calling windows, IRDAI POSP rules
  • Middle East: KSA NDMO, UAE TDRA, GDPR-equivalent residency
  • APAC: PDPA Singapore, NPC Philippines, MAS guidance
  • EU + NA: GDPR, TCPA / FCC opt-in, STIR/SHAKEN signing
  • Audit-grade call logging + on-prem retention available
Numbers

Local-presence numbers your customers actually pick up.

A call from a local-format number is 3-5× more likely to be answered than an international one. EnableX provisions virtual numbers in 70+ countries (toll-free, mobile, and landline) straight from the console. Number porting supported when you want to bring your own.

  • 70+ countries with self-service provisioning
  • Toll-free, mobile, and landline ranges per market
  • Local-presence dialling for outbound campaigns
  • Number porting in / porting out supported
  • STIR/SHAKEN signing on US/CA outbound where required
Flexibility

BYO SIP, BYO number, BYO voice AI stack.

Already have a carrier contract? Bring the SIP trunk. Already have a number range? Port it. Building your own STT/LLM/TTS pipeline? Stream raw audio over WebSocket and let EnableX handle only the telephony. The platform meets you where you are.

  • BYO SIP trunk (SIP / SIP-over-TLS, any provider)
  • BYO number range with port-in / port-out
  • WebSocket media streaming for builders (sub-100ms)
  • Cloud, hybrid, or on-premise deployment
  • One contract for telephony + voice AI, no stitching

Connect the way you already work

BYO SIP

Bring your own SIP trunk

Standard SIP / SIP-over-TLS signalling. EnableX terminates the SIP, runs the voice agent, and resolves or warm-transfers to your contact centre. No need to switch carriers.

WhatsApp Voice

WhatsApp Business Voice Calling

Customers tap "Call" inside the WhatsApp thread; the call lands on your voice AI agent, with chat history pre-loaded as context.

Read the walkthrough
WebRTC

In-app voice, no number needed

Embed a voice agent in your app or website. No PSTN cost, no number provisioning. Falls back to PSTN if WebRTC fails.

See Voice API for WebRTC
For builders

WebSocket media streaming

Bidirectional raw audio (PCM / Opus / G.711), sub-100ms one-way latency. Pipe to Deepgram, OpenAI, ElevenLabs, Pipecat, LiveKit, or your own model.

Voice API + WebSocket docs
70+ countries with local-presence virtual numbers
Global reach with deepest interconnects in APAC + ME
4 connection types: PSTN, SIP, WebRTC, WhatsApp Voice

Explore more from EnableX

The EnableX Difference

On-Premise Voice AI

Run voice AI behind your firewall, same platform, on-prem.

On-prem
CPaaS

Voice API

Programmable voice for developers, same telephony backbone.

Voice API
CPaaS

Virtual Numbers

Provision local-presence numbers in 70+ countries from the console.

Numbers
Evaluating alternatives?
vs Twilio → vs Exotel → vs Vapi → All comparisons →

FAQ: Telephony / SIP / PSTN

EnableX Voice AI supports PSTN (the regular phone network), SIP trunks (carrier-grade enterprise telephony), WebRTC (in-app voice), and WhatsApp Business Voice Calling (Meta beta and GA channels). Customers can place or receive calls on any of these without changing the voice agent build.

Jio, Airtel, Vodafone Idea (VI), BSNL/MTNL, plus all major Indian SIP providers. Both inbound and outbound. TRAI compliance built in (DND lists, calling windows, header registration where required).

Middle East: Etisalat, du, STC, Mobily, Zain, Ooredoo, Batelco. Southeast Asia: Telkomsel, Indosat, XL (Indonesia), Singtel, Starhub, M1 (Singapore), Maxis, Celcom, Digi (Malaysia), Globe, Smart (Philippines), Viettel, Vinaphone (Vietnam), AIS, True (Thailand). Local-presence numbers, regulator-compliant where required.

Yes. Bring your own SIP trunk via standard SIP signalling. EnableX terminates the SIP, runs the voice AI conversation, and either resolves or warm-transfers to your contact centre. No need to migrate your carrier.

Provision local-presence numbers in 70+ countries from the EnableX console. Local short codes, toll-free, mobile, and landline ranges. Numbers are routed straight into your voice AI agent, no extra hardware.

EnableX is among the early supporters of WhatsApp Business Voice Calling. Customers tap to call inside the WhatsApp thread; the call lands on your voice AI agent. Same flow logic, no extra build.

Yes for SIP. PSTN connectivity goes through carrier interconnects (which is the carrier's network). The voice AI orchestration, recording, and intelligence sit inside your data centre.

See EnableX in action.

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