Voice AI Solutions
That Answer 24/7
We build AI-powered voice agents that handle inbound calls, qualify leads, book appointments, and resolve customer queries using Twilio, Vapi, ElevenLabs, and OpenAI. Human-like conversations. Zero hold times. Always on.
End-to-End Voice AI Services
From AI inbound agents to outbound campaigns and CRM integrations we build voice automation that handles real customer calls.
AI Inbound Call Handling
Deploy voice AI agents that answer every inbound call instantly greet callers, understand their intent, resolve queries, and escalate to a human only when needed.
Speech-to-Text & NLU
Powered by OpenAI Whisper and advanced NLU models, our agents understand natural speech accents, interruptions, and complex queries not just keyword triggers.
AI Voice Agents
Build human-like voice agents using ElevenLabs TTS and GPT-4o agents that hold full, context-aware conversations, remember prior turns, and adapt in real time.
Outbound Call Automation
Launch automated outbound call campaigns for lead follow-ups, appointment reminders, payment nudges, and re-engagement at scale, without a single rep dialling.
CRM & Tool Integrations
Sync every call, transcript, and outcome bi-directionally with HubSpot, Zoho, Salesforce, or any CRM so your team always has full context without manual logging.
Call Analytics & Reporting
Track call volumes, resolution rates, agent performance, escalation triggers, and conversion rates through real-time dashboards know exactly what's working.
Why Voice AI
Your Calls, Handled Automatically.
Phone is still the highest-trust channel for customers. A Voice AI agent lets you meet them there at any hour, at any scale without growing your support headcount.
Without Voice AI
Missed calls, long hold times, and frustrated customers. Reps buried in repetitive queries — or worse, calls going to voicemail.
With Mind Stack Labs
AI voice agents that answer instantly, qualify leads 24/7, and resolve queries on autopilot — zero hold times, always on.
Why Choose Mind Stack Labs
AI-first voice team since 2019
Twilio, Vapi & ElevenLabs specialists
250+ automation systems delivered globally
Dedicated project manager per engagement
Clean, documented, production-ready systems
NDA & full IP ownership guaranteed
Long-term support & maintenance plans
Free 30-day post-launch support included
Industries We Serve
We've delivered Voice AI solutions across a wide range of industries and business types globally.
Voice AI Flows We Build
From inbound call handling to outbound campaigns and 24/7 support we automate every voice touchpoint in your customer journey.
Inbound Call Handling
Caller dials in → AI greets and identifies intent → resolves query or books appointment → logs outcome to CRM → escalates to human if needed. All instant, all automated.
Appointment Booking
Caller requests a slot → AI checks real-time availability → books the appointment → sends confirmation → reminds 24h before. Zero back-and-forth, zero manual scheduling.
Lead Qualification
Inbound lead calls → AI runs a qualification script → scores the lead → routes hot leads to a rep instantly → logs cold leads for nurturing. No lead slips through.
Order & Payment Status
Customer calls about an order → AI authenticates → pulls real-time data from your system → answers status, ETA, or payment queries no human agent required.
Outbound Follow-up Campaigns
AI dials your lead list → delivers a personalised message → records responses → books meetings or flags hot prospects → syncs all outcomes back to your CRM.
24/7 Customer Support
Resolve FAQs, handle complaints, check account status, and escalate complex cases your AI voice agent works around the clock, reducing support load by up to 70%.
Our Voice AI Tech Stack
We use industry-leading voice and AI tools to build reliable, natural-sounding, and scalable voice agents.
Twilio
OpenAI Whisper
ElevenLabsOpenAI GPT-4o
n8n
Make
Supabase
Firebase
REST APIsFrom Idea to Live Voice Agent
A structured process that ensures every Voice AI agent is built right, tested thoroughly, and delivered on time.
Discovery & Call Mapping
We analyse your current call flows, identify the highest-volume query types, and map out the full conversation architecture before any build begins.
Voice Flow Design
We script every conversation branch greetings, fallback responses, escalation triggers, and AI decision nodes and get sign-off before writing code.
Build & Test
We build the voice agent, integrate your CRM and data sources, and run stress tests across every edge case bad audio, accents, interruptions, and silence.
Launch & Optimise
We go live, monitor live call performance, tune prompts and escalation rules, and continuously improve resolution rates and caller satisfaction scores.
Advanced Voice AI Features
Our voice agents go far beyond basic IVR they hold real conversations, authenticate callers, and generate actionable post-call intelligence.
Human-like Voice Synthesis
ElevenLabs TTS produces natural, expressive voices indistinguishable from a real agent choose from dozens of voices or clone your own brand voice.
Real-time Interruption Handling
Our agents listen while speaking they detect when a caller interrupts, pause immediately, and adjust their response naturally, just like a real human would.
Caller Authentication
Verify callers using account numbers, OTP, or voice biometrics before surfacing sensitive data GDPR-compliant and fully auditable.
Post-call Intelligence
Every call is auto-transcribed, summarised, and tagged with intent and outcome giving your team full context without listening to a single recording.
FAQ
Common Questions
Have more questions? Book a free 30-minute discovery call no commitment required.
Book a free callDoes the voice agent sound robotic?
Not at all. We use ElevenLabs text-to-speech the industry's most natural-sounding voice synthesis. Callers regularly can't tell they're speaking to an AI, especially after we fine-tune the voice to match your brand tone.
Can the agent handle complex or unexpected queries?
Yes. GPT-4o handles natural, open-ended conversations. When the agent encounters something truly outside its scope, it smoothly hands off to a live agent with full context passed over so the caller never has to repeat themselves.
What languages and accents does it support?
Our agents support 30+ languages out of the box via OpenAI Whisper and ElevenLabs. We tune each deployment for regional accents and dialects relevant to your customer base.
Will I own the voice agent after delivery?
Yes. You receive complete ownership of all scripts, prompts, flows, and integrations. Everything is fully documented and handed over with an NDA and IP assignment agreement included.
Let's Build Your Voice AI Agent
Tell us about your call flows and we'll provide a detailed Voice AI proposal within 24 hours.