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Voice AI Services

Conversational AI Voice Services for Business

Deploy production-grade voice AI agents that handle complex conversations with human-like understanding. From 24/7 multilingual customer service and lead nurturing to payment reminders and interview coaching. Built on Vapi, Twilio and Retell. Integrated with your CRM, ticketing system, and business workflows.

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Our Trusted Clients

ICICI
Waterfield
Grip
Armstrong
Elunic
Nortmaq
Xanevo
Ackuity
Benow
Brand Trust
Civiq
Corsano
Desert Recovery Center
Northwell Health
Osteopathic Healing Hands
Sanofi
Street
TBL
Understanding the Service

What is a Voice AI Service for Business?

An AI voice service for business is a production-grade AI system that handles inbound and outbound phone interactions with human-like understanding. It replaces traditional IVR menus with intelligent, conversational voice agents that listen, understand intent, respond naturally, and complete real business tasks.

Unlike scripted voice bots, modern voice AI agents use large language models, natural language understanding, and real-time speech processing to handle complex multi-intent conversations. They connect directly with your CRM, ticketing system and business workflows, enabling automated resolution, seamless human handoff, and continuous performance monitoring.

At Quantal AI, we design, build and deploy custom voice AI agents tailored to your industry, language and tone. Our voice AI development is backed by our full-stack AI engineering services covering everything from architecture and integrations to deployment and ongoing optimization. We use Vapi, Twilio, and Retell as our core voice infrastructure, selecting the right platform based on latency, language requirements, and cost.

Built for Real Business Conversations

Our voice AI agents go beyond scripted responses. They handle complex multi-intent calls, detect sentiment and escalate to human agents when needed, passing full conversation context so nothing gets lost in the handoff.

Integrated With Your Existing Systems

Every voice AI deployment connects with your CRM, ticketing platform, calendar and business workflows. Voice AI works within your existing operations rather than alongside them as a disconnected tool.

Multilingual and Accent-Ready

We design for the languages and accents your callers actually use. We support 50 plus languages including Indic, MENA, LATAM and English variants with real code-switching capability built in from the start.

Enterprise-Grade Voice Infrastructure

Built on Vapi, Twilio and Retell with low-latency real-time speech processing, sentiment detection and enterprise-grade reliability for high-volume deployments that need to perform consistently every day.

Why Voice AI

What Voice AI Can Actually Do for Your Business

Reduce Customer Support Costs

Handle high-volume inbound calls without adding headcount. Voice AI agents resolve routine queries, route complex cases, and operate around the clock at a fraction of the cost of a human support team. Businesses that deploy ai voice services for businesses consistently reduce their cost per interaction while improving first-call resolution rates.

Real Example

Convert More Leads Faster

Automated outbound lead nurturing calls reach prospects immediately after they enquire. Each call qualifies the lead through natural conversation, follows up at the right time and books meetings directly into your sales calendar. Your team receives warm, qualified prospects instead of spending hours on manual outreach.

Real Example

Eliminate Payment Collection Delays

Tone-appropriate payment reminder calls with automated payment plan options reduce days' sales outstanding without straining customer relationships. Every call stays within regulatory boundaries and outcomes are documented automatically, so your collections process runs without requiring constant human oversight.

Real Example

Scale Customer Communication Instantly

Handle call volume spikes during peak periods, product launches or seasonal campaigns without hiring temporary staff or compromising response quality. Voice AI agents scale up or down based on demand, maintaining consistent call quality and response times regardless of volume.

Real Example

Our Services

Our Voice AI Agent Development Services

Our ai voice agent development services are built on top of leading speech and LLM platforms, customized for your industry, language, and tone of voice. 

Voice Lead Nurturing

Automated lead scoring, personalized follow-up sequences, calendar booking, and analytics. Quantal AI builds voice AI agents that reach out to leads at the right time, qualify them through natural conversation and book meetings directly into your calendar. Every interaction is logged, scored and fed back into your CRM, so your sales team always knows where each lead stands.

Payment Reminder Calls

Tone-appropriate reminders, payment plan negotiation, compliance with collection regulations. Our payment reminder voice agents handle outbound calls with the right tone for each situation. They can present payment plan options, answer basic queries, and document outcomes automatically. Our agents document every call outcome automatically and feed results back into your system, giving your team full visibility without manually tracking each interaction

Voice Interview Coaching

Industry-specific questions, real-time feedback on pace and clarity, personalized recommendations. We build voice AI coaching agents that simulate real interview conditions. Candidates receive industry-specific questions, real-time feedback on their pace, clarity and delivery, and personalized recommendations they can act on immediately. Sessions are recorded and reviewed, so progress is tracked over time.

24/7 Multilingual Customer Service

NLU in 50+ languages, real-time sentiment detection, integration with existing CRM and ticketing. Our multilingual customer service agents handle inbound calls around the clock in over 50 languages. They detect sentiment in real time and escalate to a human agent with full context when the situation requires it. Every interaction syncs with your CRM and ticketing system, so resolution data is always where your team needs it.

AI Voice Agent for Sales

Outbound sales call automation, real-time objection handling, lead qualification and CRM updates. We build outbound sales voice agents that prospect, qualify and book meetings at scale. Each agent handles objections naturally, updates your CRM in real time and books confirmed meetings directly into your sales team calendar. Your team focuses on closing while the voice agent handles the top of the funnel.

Custom Voice AI Agent Development

End-to-end design, development and deployment of custom voice AI agents built on Vapi, Twilio or Retell and integrated with your specific business systems, workflows and compliance requirements. When your use case does not fit a standard template, we build from scratch. Our ai engineers scope the full conversation architecture, select the right voice platform, build the integrations, and deploy a production-ready agent designed entirely around your business needs.

Who We Serve

Industries We Serve

Healthcare

  • Patient appointment scheduling and reminders
  • Post-discharge follow-up calls
  • Insurance verification voice automation
  • HIPAA-aware voice AI deployment

Financial Services and Fintech

  • Payment reminder and collections calls
  • Loan application status updates
  • Fraud alert verification calls
  • Regulatory-compliant voice interactions

E-commerce and Retail

  • Order status and delivery update calls
  • Returns and refund processing automation
  • Post-purchase feedback collection
  • Promotional outbound campaigns

Real Estate

  • Lead qualification and follow-up calls
  • Property viewing scheduling automation
  • Tenant support and maintenance request handling
  • Multilingual buyer and seller communication

HR and Recruitment

  • Automated interview scheduling calls
  • Candidate pre-screening and qualification
  • Employee onboarding voice assistance
  • Voice-based interview coaching platforms

SaaS and Technology

  • Customer onboarding call automation
  • Trial-to-paid conversion outbound calls
  • Churn prevention follow-up campaigns
  • Technical support first-line voice triage

Hospitality and Travel

  • Reservation confirmation and reminder calls
  • Guest experience follow-up automation
  • Booking modification and cancellation handling
  • Multilingual concierge voice assistance

Legal and Professional Services

  • Client intake and appointment scheduling
  • Document submission reminder calls
  • Compliance verification voice workflows
  • Multilingual client communication automation

Capabilities

Our voice AI capabilities are built on top of leading speech and LLM platforms, customized for your industry, language, and tone of voice. "They built a fully functional AI voice agent - voice logic, integrations, testing, production rollout - with impressive technical skill and attention to detail." - Thai Nguyen, Desert Recovery Centres

24/7 Multilingual Customer Service

NLU in 50+ languages, real-time sentiment detection, integration with existing CRM and ticketing.

Voice Lead Nurturing

Automated lead scoring, personalized follow-up sequences, calendar booking and analytics.

Payment Reminder Calls

Tone-appropriate reminders, payment plan negotiation, compliance with collection regulations.

Voice Interview Coaching

Industry-specific questions, real-time feedback on pace and clarity, personalized recommendations.

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Why Quantal AI

What Sets Our Voice AI Development Apart

01

Production-Grade Voice Infrastructure

We build on Vapi, Twilio and Retell, selecting the right platform based on latency, language requirements and cost. Your voice AI agents perform reliably at scale from day one without the instability that comes from building on the wrong infrastructure.

02

Sentiment Detection and Human Handoff

When our voice agents detect frustration, an out-of-scope query or a high-value request, they transfer to a live agent with full conversation context. The handoff arrives as a Slack, Salesforce or Zendesk notification, so your human team is ready before they pick up.

03

Multilingual and Accent-Ready Deployment

We design for the languages and accents your callers actually use, not just the standard demo languages. We support Indic, MENA, LATAM and English variants with real code-switching built into the conversation logic.

04

CRM and Workflow Integration

Every voice AI deployment connects with your existing CRM, ticketing system, calendar and business workflows. Voice AI becomes part of your operations, not a separate tool your team has to work around.

05

Fast Deployment, Live in 2 to 8 Weeks

Most deployments are live in 4 to 8 weeks. Simple use cases like payment reminders can launch in 2 weeks. Complex multi-intent agents take 8 to 12 weeks including full QA and a supervised launch period.

06

Ongoing Monitoring and Optimisation

After launch we continue monitoring agent performance, refining conversation flows, updating integrations and optimising for accuracy. Your voice AI keeps improving over time rather than degrading as your business evolves.

How We Work

Our Voice AI Development Process

Our ai voice agent development services follow a structured five-step process from discovery and architecture through to deployment and ongoing optimization, ensuring every voice AI agent performs reliably from the first live call. 

We begin with a deep-dive scoping session to understand your call flows, caller personas, business objectives and existing systems. We map every conversation your voice AI agent needs to handle and define clear success metrics before a single line of code is written.

Requirements Feasibility Architecture Planning

Our engineers design the complete voice AI system. This covers LLM selection, voice platform choice between Vapi, Twilio and Retell, NLU configuration, integration points and sentiment detection logic. You receive a full technical blueprint before development begins.

Model Selection Platform Design Integration Mapping

We develop your voice AI agent through agile sprints with regular demos. Conversation flows are refined, edge cases are tested and response quality is improved based on real call scenarios and your direct feedback throughout the build.

Agile Sprints Weekly Demos Rapid Iteration

Every voice AI agent undergoes rigorous testing across accents, languages, conversation intents and edge cases. We validate accuracy, latency, sentiment detection and integration reliability before any go-live decision is made.

QA Testing Accent Testing Accuracy Benchmarking

Once validated we deploy your voice AI agent, configure monitoring and alerts and provide complete technical documentation. Post-launch we continue optimising conversation flows, updating integrations and improving performance as your call data grows.

Production Deploy Monitoring Setup Documentation and Handover
Ready to Deploy

Ready to Build a Voice AI Agent That Delivers Real Business Results?

Whether you need an ai voice service for business covering customer service, lead nurturing or payment reminders, our team can scope, build and deploy a production-ready solution integrated with your existing systems. 

Case Studies
Leadership Team

Meet Our
Founders

Shailesh Jain

Co-Founder · CMU Alumni

Shailesh Jain

Nirav Shah

Co-Founder · Columbia, Ex UBS

Nirav Shah
Client Stories

What clients say about us.

“Quantal AI and Team are EXPERTS at building ANY AI functionality you’re seeking! We’ve hired them for 2 projects already — each completed ON TIME and UNDER BUDGET. Highly Recommended!”

Melissa C
Melissa C
myhomecarebiz.com

“Working with Quantal AI team has been an absolute pleasure. Their technical aptitude is outstanding — they’re not only highly competent but also creative, thoughtful, and reliable. They built a complex integration for our wine business connecting PhotoRoom, Google Cloud, AWS, and Shopify, and it works beautifully.”

David F
David F
Osteopathic Healing Hands

“It was a pleasure working with Quantal AI team. Communication was smooth, deadlines were respected, and the overall collaboration was professional and efficient. I would definitely consider working together again in the future. Recommended!”

Ivana M
Ivana M
Elunic AG
Our Tech Stack

Voice AI Platforms and Technologies We Work With

Voice Infrastructure
Vapi Twilio Voice Retell
Foundation Models
OpenAI Anthropic Claude Google Gemini
NLU and Speech
Deepgram ElevenLabs AssemblyAI Whisper
AI Agent Frameworks
LangChain LangGraph CrewAI
CRM and Integration
Salesforce HubSpot Zendesk Slack REST APIs
Cloud and Infrastructure
AWS Google Cloud Platform Microsoft Azure
Get in Touch

Talk to an AI Expert

Data Security

Data Security and Compliance 
 

01

Secure Data Handling

All call recordings and conversation data are managed using secure development environments and controlled access practices. We follow strict data handling protocols at every stage of the project, from initial scoping through to post-launch monitoring, so your customer and business data is never exposed or mishandled.

02

Confidential Collaboration

We work under strict confidentiality agreements and safeguard sensitive customer and business information throughout every engagement. Before any project begins, NDAs are in place, and access to your systems and data is limited to only the team members who need it.

03

Regulatory Compliance

Our voice AI systems are built with HIPAA, PCI-DSS, and GDPR compliance in mind. For businesses in healthcare, financial services, and other regulated industries, compliance is not an afterthought. It is built into the conversation architecture, data storage design, and integration layer from day one.

04

Responsible AI Development

Every voice AI agent we build includes human oversight mechanisms, bias testing, and responsible deployment practices. We do not launch agents that have not been validated for accuracy, fairness, and reliability. Your customers interact with a voice AI system that has been rigorously reviewed before it handles a single live call.

Latest Insights

Our Related Blogs

Frequently Asked Questions

Find answers to some of the most common questions about our Voice AI solutions and implementation process.

  • What is a voice AI service for business?
    An ai voice service for business is a production-grade AI system that handles inbound and outbound phone calls using natural language understanding. It replaces traditional IVR menus with intelligent conversational agents that listen, interpret intent and respond naturally, completing real business tasks and integrating with your existing systems.
  • How quickly can a voice agent be deployed?
    Most deployments are live in 4 to 8 weeks. Simple use cases like payment reminders can launch in 2 weeks. Complex multi-intent agents take 8 to 12 weeks including QA and supervised launch.
  • Which voice platforms do you work with?
    We build on top of Vapi, Retell, Twilio Voice, and direct LLM streaming pipelines using OpenAI and Anthropic. We pick the platform based on latency, language, and cost requirements of each specific deployment.
  • How much does it cost to build an AI voice agent?
    Cost depends on the complexity of your conversation flows, integration requirements, languages supported and deployment scale. We provide a detailed scope and cost estimate after an initial discovery session with no commitment required.
  • Can your voice AI agents handle accents and code-switching?
    Yes. We design for the languages and accents your callers actually use, not just the demo languages. We support Indic, MENA, LATAM, and English-variant accents with code-switching.
  • How do handoffs to human agents work?
    When the agent detects frustration, an out-of-scope query, or a high-value request, it can transfer to a live agent with full conversation context as a Slack, Salesforce or Zendesk handoff.
  • What is the difference between a voice AI agent and a traditional IVR?
    Traditional IVR uses scripted menus and keypad inputs. A voice AI agent listens, understands natural speech and responds conversationally, completing tasks rather than routing callers through fixed decision trees.
  • Can a voice AI agent integrate with my existing CRM and ticketing system?
    Yes. Every voice AI deployment we build connects with your existing CRM, ticketing platform, calendar and business workflows through custom API integrations. No ripping out existing systems required.
  • How do I get started with an AI voice agent for my business?
    Start with a discovery session. Share your call volumes, use cases, and existing systems. Our team scopes the right solution, builds to your requirements and deploys a production-ready ai voice agent development service typically within 4 to 8 weeks.
  • What industries benefit most from voice AI services?
    Healthcare, financial services, e-commerce, real estate, HR and recruitment, and SaaS businesses benefit most from voice AI services. Healthcare organisations use it for appointment scheduling and patient follow-up. Financial services businesses deploy it for payment reminders and fraud verification. E-commerce companies use it for order updates and returns processing. Any business handling high volumes of customer calls at scale is a strong candidate for voice AI deployment.
  • Is voice AI secure for handling sensitive customer data?
    Yes. Production-grade voice AI systems are built with data security and regulatory compliance as core requirements. Key security measures include encrypted call recordings, controlled data access, confidentiality agreements and compliance with HIPAA, PCI-DSS and GDPR depending on the industry. When built by an experienced development partner, voice AI systems protect sensitive customer data throughout every stage of the call lifecycle.

Ready to Build AI That Works in Production?

Whether you are deploying your first voice AI agent or scaling an existing system, our team can help you build a production-ready ai voice service for business integrated with your operations and optimised for your callers.

Or email us directly at contact@quantaltech.ai or call +1 315 809 3225.