Glossary / AI and Machine Learning
AI Voice Agent
An AI system that handles phone calls autonomously. Answers, books, routes, and follows up without human intervention.
Definition
An AI voice agent is an artificial intelligence system that handles phone calls autonomously, using speech recognition, natural language understanding, and text-to-speech to have natural conversations. It answers questions, books appointments, routes calls to the right department, and follows up, all without a human picking up the phone.
AI voice agent vs human receptionist
| Factor | Human receptionist | AI voice agent |
|---|---|---|
| Availability | Business hours only | 24/7/365 |
| Concurrent calls | 1 at a time | Unlimited simultaneous |
| Annual cost | £22,000 to £28,000 salary plus NI, pension, holiday | £1,800 to £7,000 one-off plus £50 to £150/month running |
| Consistency | Varies by mood, training, experience | Same quality every call |
| Languages | Usually 1 to 2 | 30+ languages |
| Complex empathy | Excellent | Limited, escalates to human |
| Setup time | Weeks to recruit and train | 2 to 4 weeks to deploy |
What can an AI voice agent do?
- Answer inbound calls: Greet callers, understand their request, provide information from your knowledge base
- Book appointments: Check calendar availability and schedule meetings in real time
- Route calls: Identify the right department or person and transfer intelligently
- Take messages: Record caller details and send structured summaries by email or to your CRM
- Follow up: Send confirmation texts or emails after the call
- Qualify leads: Ask screening questions and score leads before connecting to sales
What does an AI voice agent cost?
| Component | Cost range | Notes |
|---|---|---|
| Setup and configuration | £1,800 to £7,000 | One-off. Includes voice design, knowledge base setup, integrations |
| Monthly running costs | £50 to £150 | Telephony, AI API calls, hosting |
| Per-minute call costs | 3 to 8 pence per minute | Varies by provider and call volume |
| Calendar integration | Included or £200 to £500 | Google Calendar, Outlook, Calendly |
| CRM integration | £500 to £2,000 | HubSpot, Salesforce, Pipedrive |
A typical small business handling 30 to 50 calls per day would spend around £2,500 to £4,000 to set up and £100 to £200 per month to run. Compare that to £35,000 per year fully loaded cost for a receptionist.
AI receptionist vs AI voice agent
These terms are often used interchangeably. An AI receptionist is a specific type of AI voice agent focused on reception duties: answering calls, greeting visitors, booking appointments, and routing enquiries. An AI voice agent is the broader category that includes sales calling, surveys, appointment reminders, and outbound follow-ups.
When NOT to use an AI voice agent
- Complaints and escalations: Angry customers need human empathy. Use the AI to handle routine calls and escalate complaints immediately
- Complex negotiations: Sales calls requiring relationship building and nuanced discussion are not suitable
- Very low call volume: If you get fewer than 10 calls a day, a simpler solution like a chatbot or call answering service may be more cost-effective
- Heavily regulated industries: Medical or legal consultations where AI errors could have serious consequences need human oversight
Our Experience with AI Voice Agents
We build custom AI voice agents that handle calls for UK businesses. Our voice solutions have answered over 10,000 calls across multiple deployments. Original Objective has been building intelligent systems since 2013, and our CTO Matt Perry brings over 15 years of software engineering experience to every voice agent project.
Related Terms
- AI Agent - Software that acts on your behalf, making decisions and completing multi-step tasks without constant human oversight.
- AI Chatbot - An AI-powered conversational interface that handles customer questions and qualifies leads around the clock.
- AI Automation - Using artificial intelligence to perform tasks that would otherwise require human effort.
- Prompt Engineering - The practice of writing instructions that get reliable, useful outputs from AI systems.
Definition
An AI voice agent is an artificial intelligence system that handles phone calls autonomously, using speech recognition, natural language understanding, and text-to-speech to have natural conversations. It answers questions, books appointments, routes calls to the right department, and follows up, all without a human picking up the phone.
AI voice agent vs human receptionist
| Factor | Human receptionist | AI voice agent |
|---|---|---|
| Availability | Business hours only | 24/7/365 |
| Concurrent calls | 1 at a time | Unlimited simultaneous |
| Annual cost | £22,000 to £28,000 salary plus NI, pension, holiday | £1,800 to £7,000 one-off plus £50 to £150/month running |
| Consistency | Varies by mood, training, experience | Same quality every call |
| Languages | Usually 1 to 2 | 30+ languages |
| Complex empathy | Excellent | Limited, escalates to human |
| Setup time | Weeks to recruit and train | 2 to 4 weeks to deploy |
What can an AI voice agent do?
- Answer inbound calls: Greet callers, understand their request, provide information from your knowledge base
- Book appointments: Check calendar availability and schedule meetings in real time
- Route calls: Identify the right department or person and transfer intelligently
- Take messages: Record caller details and send structured summaries by email or to your CRM
- Follow up: Send confirmation texts or emails after the call
- Qualify leads: Ask screening questions and score leads before connecting to sales
What does an AI voice agent cost?
| Component | Cost range | Notes |
|---|---|---|
| Setup and configuration | £1,800 to £7,000 | One-off. Includes voice design, knowledge base setup, integrations |
| Monthly running costs | £50 to £150 | Telephony, AI API calls, hosting |
| Per-minute call costs | 3 to 8 pence per minute | Varies by provider and call volume |
| Calendar integration | Included or £200 to £500 | Google Calendar, Outlook, Calendly |
| CRM integration | £500 to £2,000 | HubSpot, Salesforce, Pipedrive |
A typical small business handling 30 to 50 calls per day would spend around £2,500 to £4,000 to set up and £100 to £200 per month to run. Compare that to £35,000 per year fully loaded cost for a receptionist.
AI receptionist vs AI voice agent
These terms are often used interchangeably. An AI receptionist is a specific type of AI voice agent focused on reception duties: answering calls, greeting visitors, booking appointments, and routing enquiries. An AI voice agent is the broader category that includes sales calling, surveys, appointment reminders, and outbound follow-ups.
When NOT to use an AI voice agent
- Complaints and escalations: Angry customers need human empathy. Use the AI to handle routine calls and escalate complaints immediately
- Complex negotiations: Sales calls requiring relationship building and nuanced discussion are not suitable
- Very low call volume: If you get fewer than 10 calls a day, a simpler solution like a chatbot or call answering service may be more cost-effective
- Heavily regulated industries: Medical or legal consultations where AI errors could have serious consequences need human oversight
Our Experience with AI Voice Agents
We build custom AI voice agents that handle calls for UK businesses. Our voice solutions have answered over 10,000 calls across multiple deployments. Original Objective has been building intelligent systems since 2013, and our CTO Matt Perry brings over 15 years of software engineering experience to every voice agent project.
Related Terms
- AI Agent - Software that acts on your behalf, making decisions and completing multi-step tasks without constant human oversight.
- AI Chatbot - An AI-powered conversational interface that handles customer questions and qualifies leads around the clock.
- AI Automation - Using artificial intelligence to perform tasks that would otherwise require human effort.
- Prompt Engineering - The practice of writing instructions that get reliable, useful outputs from AI systems.
Frequently Asked Questions
Common questions about AI voice agents for business.
Do AI voice agents sound robotic?
Modern AI voice agents use neural text-to-speech that sounds natural and conversational. Most callers cannot tell they are speaking to an AI. You can choose the voice, accent, and speaking style to match your brand. The technology has improved dramatically since early robotic-sounding systems.
How much does an AI receptionist cost per month?
After the initial setup (£1,800 to £7,000), monthly running costs are typically £50 to £200 depending on call volume. This covers telephony charges, AI API costs, and hosting. A business handling 30 calls per day would spend roughly £100 to £150 per month. Basic SaaS platforms like Bland AI start from around £30 per month but offer less customisation.
Can an AI voice agent book appointments in my calendar?
Yes. AI voice agents integrate with Google Calendar, Outlook, Calendly, and most scheduling platforms. They check real-time availability, suggest slots to the caller, and create the booking instantly. They can also send confirmation texts or emails to both parties after booking.
What happens when the AI cannot handle a call?
Well-designed AI voice agents have escalation rules. When they detect a question outside their knowledge base, an angry caller, or a request that requires human judgement, they transfer the call to a human or take a detailed message. The key is configuring clear escalation triggers during setup so nothing falls through the cracks.