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Voice AI Agents

Inbound and outbound voice agents with sub-second latency, multilingual support, and real-world telephony integration.

Price (USD)
$4K-$20K
Price (INR)
₹3.5L-₹16L
Timeline
2-5 weeks
Tier
Mid-market
studiobuildit · voice-ai-agents.ts
$ sbi voice launch --inbound --lang hi,en,ta
· orchestrator: retell · voice: elevenlabs (cloned)
telephony: twilio · sip trunk verified
audio path: livekit webrtc · 680ms p50 latency
intents: order_status, return, sizing → shopify mcp
escalation: warm transfer with full transcript
80% of inbound calls handled end-to-end · nps +11

A production voice AI agent handles inbound and outbound calls with sub-second latency, books meetings, takes orders, qualifies leads, or triages support calls at scale. For any action the agent cannot reverse, such as confirming a booking or processing an order, a human reviews and approves before the system commits.

Who this is for

D2C and SMB operators handling inbound call volume that outpaces their support team. SaaS sales teams running outbound qualification at scale. India-market businesses serving multilingual callers across Hindi, Tamil, Telugu, Marathi, Bengali, and 11 additional Indian languages via Sarvam’s stack.

What you get

  • A voice AI agent with a custom voice, either cloned from your existing brand voice or selected from a curated library.
  • Telephony integration via Twilio or an in-region equivalent for reliable call handling.
  • CRM hand-off on every call so no context is lost after the conversation ends.
  • Live transcripts and call recordings for quality review and compliance.
  • A per-minute cost dashboard so you can track spend against deflected call volume.

How we work on this

We spend week one designing the call script and conversation flows. We then build the agent, run live testing on staged numbers, and cut over to production once quality thresholds are met.

Tech stack

Retell or Vapi for the orchestration layer. ElevenLabs for English voice. Sarvam for Indian-language voice. LiveKit for sub-second WebRTC when latency is the primary constraint.

When this is the wrong choice

If your callers need genuine empathy in distress scenarios, route them to a human agent. Voice AI agents perform well on structured calls with a defined flow and break down on unscripted emotional conversations.

Pricing

Build fee: $4,000 to $20,000 depending on call flow complexity and integrations. Ongoing per-minute costs of $0.05 to $0.18 per minute depending on the stack, billed directly to you at actual cost.

FAQ

What is the latency? With LiveKit and Retell or Vapi, round-trip latency is typically under 700ms. We measure this during staged testing and will not cut over to production if it exceeds 1 second.

Is voice cloning legal? Voice cloning from a recorded person requires explicit consent. We document the consent process for any cloned voice before recording begins.

What are the call recording compliance requirements? Requirements vary by jurisdiction. We configure compliant disclosure prompts for every market where recordings are made.

What happens if the agent cannot handle a caller’s request? The agent transfers the call to a human agent and passes the full call context as a structured payload. The human does not start the conversation from scratch.

What does the ongoing per-minute cost cover? It covers the voice model inference, telephony routing, and STT/TTS processing. We show the cost breakdown per minute before you commit to the stack.

Ready to build voice ai agents?

Book a 30-minute call. We'll scope the build and quote on the same call.