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Voice AI Agent Development Services
Phone and voice assistants that answer calls, book appointments, qualify leads and hand over to people when they should.
Stack we work in
- Claude
- Google Gemini
- ElevenLabs
- LangChain
- Python
- FastAPI
- Node.js
- WebRTC
- Projects delivered
- 680+
- Clients served
- 310+
- Client retention
- 98%
- Certified engineers
- 20+
- Building since
- 2018
Figures as of Oct 2026
Trusted by
- Aralia
- Rosa Pistrina
- Lashbo
- Micromunchi
- Payroll Ninja
- POD
- Petdx
- Yokey
- Spin Up
- Starwear
- Udlins
- Vegpal
- Wander Wings
- Wish It
- Wisl
Why phone calls are hard to scale
We build voice AI agents that answer and make phone calls, understand callers in natural speech and complete tasks such as booking appointments, qualifying leads and resolving common support requests.
Read the full overview
Each agent combines speech-to-text, an LLM for reasoning, text-to-speech and your telephony, CRM and helpdesk systems, with clear rules for when a call goes to a person. We tune for low latency and natural turn-taking, and design call recording, consent and data handling in from the start.
Callers expect a quick, natural answer at any hour. Staffing every line for every peak is not realistic.
Missed calls and long hold times
Peaks, lunch breaks and evenings leave callers waiting or hanging up, and those leads and bookings go elsewhere.
Staff tied up with routine calls
Bookings, status checks and simple questions take time that skilled staff could spend on complex cases.
Old IVR menus frustrate callers
Press-one menus cannot understand what callers say and send them round in loops.
Slow, robotic voice bots
Long pauses and agents that cannot be interrupted make callers ask for a person straight away.
Recording and privacy concerns
Calls carry personal data, so recording, consent and retention must be handled correctly from day one.
Outcomes
What you get
- Calls answered at any hour, including peaks and after closing time
- Appointments booked and leads qualified without staff on the phone
- Complex or sensitive calls passed to a person with full context
- Every call transcribed, summarized and logged in your CRM or helpdesk
- Natural conversations with short response times and interruption handling
- Recording, consent and data retention handled by design
What we deliver
What you receive from a voice AI project
Call flow and scope document
The call types the agent handles, escalation rules, compliance wording and voice choice, agreed before the build.
Working voice agent
An agent on your numbers or app that listens, reasons and speaks with low latency and interruption handling.
Telephony and system integrations
Connections to your phone system, CRM, calendar and helpdesk, with warm transfer to people.
Test call set and results
Scripted test calls with expected outcomes, rerun before every change goes live.
Call analytics dashboard
Transcripts, summaries, call outcomes, transfers, latency and cost in one place.
Code, prompts and runbook
Repositories, prompts, configuration and a runbook handed over to your team.
Where voice AI agents help
Appointment booking
Book, move and cancel appointments by phone, checking live availability in your calendar or booking system.
Lead qualification
Answer enquiry calls or call back web leads, ask qualifying questions and pass hot leads to sales.
Customer support line
Answer common questions, check order or account status and open tickets for anything that needs a person.
Front desk and receptionist
Greet callers, answer opening hours and location questions and route calls to the right person or team.
After-hours and overflow
Take calls outside opening hours or when lines are busy, so no caller reaches a dead end.
Outbound reminders and follow-ups
Call customers with reminders, confirmations and surveys, and record their answers in your systems.
Voice Agent Design
- Call Flow and Conversation Design
- Task Scope and Escalation Rules
- Voice, Tone and Persona Selection
- Script Guardrails and Compliance Wording
- Multilingual and Accent Coverage
Speech and Language Pipeline
- Speech-to-Text with Whisper, Deepgram or AssemblyAI
- LLM Reasoning with GPT, Claude or Gemini
- Text-to-Speech with ElevenLabs or Azure AI Speech
- Speech-to-Speech with the OpenAI Realtime API
- Low-Latency Streaming and Barge-In Handling
- Custom Vocabulary for Names and Product Terms
Built with
- Claude
- OpenAI Realtime API
- Whisper
- Deepgram
- AssemblyAI
- ElevenLabs
- Azure AI Speech
Telephony and Channels
- Inbound and Outbound Calls over Twilio or Vonage
- Web and App Voice with WebRTC and LiveKit
- Warm Transfer to Human Agents
- IVR Replacement and Call Routing
- Voicemail Detection and Callbacks
Built with
- Twilio
- Vonage
- LiveKit
- WebRTC
Business System Integration
- CRM Lookups and Lead Updates
- Calendar Booking and Rescheduling
- Helpdesk Ticket Creation
- Order, Account and Status Lookups
- Call Summaries Written Back to Your Systems
Quality, Analytics and Compliance
- Call Recording with Consent Prompts
- Transcripts, Summaries and Call Analytics
- Test Calls and Evaluation Sets
- Latency and Cost Monitoring
- Personal Data Redaction in Transcripts
Why teams choose Equitysoft for voice AI agents
Latency treated as a feature
Streaming speech, barge-in handling and the OpenAI Realtime API keep responses natural, and we measure response time on every test call.
Works with your phone system
Inbound and outbound calls over Twilio, Vonage or SIP, with warm transfer to a human and call summaries written back to your CRM.
Compliance wording and consent built in
Consent prompts, scripted guardrails and personal data redaction in transcripts are part of the call design from the start.
Test calls before go-live
An evaluation set of scripted test calls runs before launch and after each change, and call analytics show what callers actually asked.
Recent work from our team
How we work
Call Review and Scope
We listen to sample calls, map the most common call types and agree which tasks the agent handles and which go to a person.
You receive Call type map and agent scope
Conversation and Voice Design
We design call flows, prompts, escalation rules and compliance wording, and choose the voice, languages and speech providers.
You receive Call flow design and voice selection
Prototype and Test Calls
We build a working agent on a test number and run scripted and real test calls to measure accuracy, latency and caller experience.
You receive Working prototype and test call results
Integration and Telephony
We connect the agent to your phone system, CRM, calendar and helpdesk, and set up transfers, recording and consent prompts.
You receive Integrated voice agent on your numbers
Pilot Launch
We route a share of real calls to the agent, review transcripts daily and tune prompts, vocabulary and transfer rules.
You receive Pilot report with call outcomes
Monitor and Improve
We track containment, transfers, latency and cost, review failed calls and add new call types over time.
You receive Monitoring dashboards and improvement plan
Tech stack
Technologies we use
AI and machine learning
Databases
Backend and APIs
Languages
Messaging and channels
Other tools
Next step
Need an agent for chat, email or back-office tasks too?
The same models and integrations can power text agents that complete multi-step tasks across your systems.
Questions, answered
Cost depends on the number of call types, the systems the agent must connect to, languages, call volume and the level of testing needed. We usually start with a fixed-scope prototype on a test number, then estimate the production build. Running costs for speech, model and telephony usage are estimated per minute and can be capped. As a guide, a focused AI pilot usually costs $10,000 to $50,000, and a full custom AI build $40,000 to $150,000 or more (USD).
A prototype for one or two call types often takes a few weeks. A production agent with telephony, CRM and helpdesk integration typically takes a few weeks to a few months, depending on scope. We agree milestones after the call review.
We recommend that the agent says so at the start of the call, and we design it that way by default. Callers can ask for a person at any time, and the agent transfers them with a summary so they do not repeat themselves.
We stream audio through speech-to-text, the model and text-to-speech at the same time, choose fast models for each step and keep prompts short. Barge-in handling lets callers interrupt the agent, and the agent stops speaking and listens, as a person would.
Yes. We connect through providers such as Twilio or Vonage, SIP trunks or your contact center platform, and can keep your existing numbers. The agent can take all calls, overflow calls only, or calls outside opening hours.
Current speech models handle many languages and a wide range of accents. We test with recordings that match your callers, add custom vocabulary for names and product terms, and can switch language within a call where needed.
Callers hear a consent and recording notice, recordings and transcripts are encrypted and kept for a period you set, and personal data can be redacted from transcripts. We use enterprise speech and model services whose business terms do not use your data for training. Data handling is designed around GDPR and the local data protection rules that apply to you.
You own the code and IP we build for you, including call flows, prompts and integrations. Recordings, transcripts and analytics stay in accounts you control.
Yes. We work with your contact center, CRM and IT teams, use your existing tools and work in your repositories so your developers can maintain the agent.
We review failed and transferred calls, tune prompts and vocabulary, watch latency and cost and add new call types. This runs on a monthly support plan, or we hand over to your team with documentation and training.
Book a call, and we talk through the goal, the systems involved and any constraints under NDA. You then get a short written proposal with scope, timeline and estimate. We need the call types to cover, your phone provider details, a few recorded or transcribed calls, and the systems the agent must look up or update.
Let a voice AI agent answer your calls
Book a free consultation. We will review your call types and suggest where a voice agent can start.