AI Voice Agents
An AI voice agent answers your phone 24/7, books appointments straight into your diary, answers routine questions and passes anything else to a person. BigBerri builds them for UK businesses that run on the phone, live in one to two weeks, with a fixed price quoted after a free discovery call.
- Live in 1–2 weeks
- Fixed price, never a day rate
- Books into your existing diary or CRM
- Hands over to a person by your rules
Incoming call — 02:47 AM
Outside business hours
Agent response
“Hello, thanks for calling. I can book your appointment right now — what day works best for you?”
Every
Call answered
0s
Hold time
What the Agent Does
24/7 Inbound Answering
Never miss a call. The AI answers every call instantly — nights, weekends, and bank holidays.
Appointment Booking
Checks your calendar in real-time and books, confirms, and reschedules appointments automatically.
Outbound Calling
Follow-up calls, appointment reminders, lead qualification — the AI calls your list on a schedule.
Call Routing & Escalation
Routes complex queries to the right person, takes messages, or triggers email alerts for urgent calls.
Built for Phone-Heavy Businesses
What a Project Looks Like
Every project is scoped and quoted after a free discovery call, so you get a fixed price for your situation rather than a number that assumes someone else’s. These are the shapes most engagements take.
Call Answering
Businesses missing calls while the team is busy, on site, or closed.
Typical timeline: 1–2 weeks
- 24/7 inbound answering
- FAQs, opening hours, directions
- Message taking and email summaries
- Transfer to a human on request
Booking & CRM Agent
Practices and agencies where the call needs to end in an appointment.
Typical timeline: 2–4 weeks
- Everything in call answering
- Live calendar and CRM booking
- Caller identification from your records
- Appointment reminders by SMS
Multi-Site & Outbound
Several branches or departments, or teams that also need outbound calling.
Typical timeline: 4–8 weeks
- Several locations or departments
- Outbound follow-ups and reminders
- Payment collection and verification
- Call analytics dashboard
Timelines are typical and depend on how many systems are involved and how ready your data is. Tell us what you need and we will give you a fixed price and a date.
Live in 1–4 Weeks
Call Audit
We review your most common call types, questions, and current call handling to design the right agent.
Script & Train
Write the agent script, set up the AI model, configure integrations (calendar, CRM, booking system).
Test & Refine
Run test calls, adjust responses, fine-tune edge cases until the agent handles your real call scenarios perfectly.
Go Live
Forward your number (or add a new one). The agent goes live. We monitor and improve in the first few weeks.
Frequently Asked Questions
What can an AI voice agent handle?
Inbound call answering, FAQ responses, appointment booking and rescheduling, call routing, lead qualification, after-hours answering, and outbound follow-up calls. It handles most routine calls without human involvement.
How natural does it sound?
Modern AI voice agents use ElevenLabs or similar TTS that sounds very natural — no robotic voice. Most callers cannot tell the difference in routine conversations. You can customise the name, accent, and personality.
What happens when the AI cannot help?
The agent can transfer the call to a human, take a message, book a callback, or send an email alert — depending on your preference. You define the escalation rules.
Can it integrate with our calendar or booking system?
Yes. We integrate with Google Calendar, Microsoft Outlook, Calendly, Cliniko, Acuity, and most booking systems. The agent checks availability in real-time and books appointments directly.
What industries do you build voice agents for?
Dental practices, GP surgeries, law firms, estate agents, restaurants, trades (plumbers, electricians), gyms, beauty salons, and any business that receives repetitive phone enquiries.
How long does setup take?
A basic voice agent with FAQ and call routing typically takes 1–2 weeks. Fully integrated agents with calendar booking, CRM logging, and custom call flows take 2–4 weeks.
Why not just use a self-serve AI answering app?
Self-serve AI answering apps are a fair option if you mainly need missed calls covered with a generic script. What we build is different: an agent trained on your actual services, prices and team, integrated with your real calendar or CRM, with a fixed price for the build and ongoing tuning as real callers reveal edge cases. If a low-cost app is genuinely enough for your business, we will tell you that on the discovery call rather than sell you a project you do not need.
Read before you buy ai voice agents
- AI Services
AI Receptionist Subscription or Custom Build? The Honest UK Comparison
A subscription needs nothing up front; a custom build is engineered around your systems. Where each one wins, what actually sits underneath both, and how to decide without guessing.
- AI Services
AI Answering Service for UK Small Businesses: What to Look For in 2026
A straight guide to choosing an AI answering service in the UK — what the templated subscription apps actually give you, what a custom-built voice agent adds, and the questions to ask before you sign.
- AI Services
AI Voice Agent Cost UK: What Drives the Price in 2026
A straight guide to AI voice agent and AI phone answering costs for UK businesses in 2026 — what actually drives the price up or down, hidden extras to ask about, and how it compares to a part-time receptionist.
- AI Services
AI Receptionist for GP Surgeries in the UK: What It Can Safely Do in 2026
A practical guide for UK GP practices and PCNs weighing up an AI receptionist — the tasks it can safely handle, the lines it must never cross, governance to confirm with your ICB, what drives the cost and how to run a four-week pilot.
Stop Missing Calls. Start with AI.
Book a free discovery call — we'll show you how an AI voice agent can work for your specific business.
Book a Free Discovery Call