Missed calls are missed revenue. We build custom AI voice agents that answer your business phone 24/7 and work inside your own systems — greeting callers naturally, answering questions, qualifying leads, booking appointments in your calendar, and handing over to your team when it matters. Built on SignalLine, our sister product.
Start a ProjectDon't imagine it — call it. Dial the number below and you'll be speaking with Thalia, the AI receptionist of SignalLine, our sister product. The custom voice agents we build run on the same platform.
📞 Call +44 20 4511 4077Standard UK call rates apply. For a ready-made AI receptionist rather than a custom build, go straight to signalline.io.
Everything you need, nothing you don't.
A natural-sounding AI answers every inbound call — day, night, weekends, and peak hours. No hold music, no voicemail, no missed enquiries.
The agent asks the right questions, captures caller details, and scores enquiries — so your team wakes up to qualified leads, not a list of missed calls.
Callers book, move, or cancel appointments directly with the AI, synced to your calendar. Outbound reminder calls cut no-shows.
Automated outbound campaigns — customer satisfaction surveys, payment reminders, follow-ups — at a scale no human team can match.
Works with your existing numbers and phone system via SIP/VoIP, and writes every call outcome into your CRM automatically.
Every engagement comes with:
A clear process from first call to final delivery.
We map what your callers actually ask for, which calls the AI should handle, and which must reach a human immediately.
We design the agent's voice, tone, and conversation flows around your brand — then you test-call it and refine.
We connect the agent to your numbers via SIP trunking — keeping your existing numbers — and integrate your calendar and CRM.
The agent takes a controlled share of real calls (for example, out-of-hours only) while we measure and tune.
Full rollout with human-handoff rules in place: the AI escalates to your team by transfer, SMS, or email whenever needed.
Call transcripts, outcomes, and analytics reviewed continuously; the agent improves every week.
A custom voice agent is quoted fixed-price after a free consultation, covering conversation design, integration with your systems and testing — you'll know the cost before any work begins. If a ready-made AI receptionist is all you need, SignalLine (signalline.io), our sister product, is pay as you go: £0.15 per minute in English or £0.20 per minute in 15 languages, with no monthly fee and the first 20 minutes free.
Working with a UK business? We deploy on UK phone numbers, follow UK GDPR and PECR rules for call recording and consent, and design escalation to your team within UK business hours.
Want your own numbers first? Work out what missed calls cost your business with our free calculator →
Four ways to handle a ringing phone, side by side.
| Voicemail | In-house receptionist | Human answering service | Custom AI voice agent | |
|---|---|---|---|---|
| Hours covered | 24/7, but nobody answers | About 40 hours a week | Often extended hours, rarely genuinely 24/7 | 24/7, including weekends and bank holidays |
| Knows your business | No | Yes — best of any option | Works from a short script | Trained on your services, prices and FAQs |
| Books appointments | No | Yes | Sometimes, at extra cost | Yes, straight into your calendar |
| Cost as volume grows | n/a | Hire another person | Per-call fees add up quickly | Rises gently, no new hires |
| Biggest weakness | Callers can only leave a message | Off at 5pm, and can only take one call at a time | Message-taking more than problem-solving | Hands over to a human for anything genuinely unusual |
The calculator below works out what missed calls cost you, from your own call volume.
Tell us about your project and we'll get back to you within 24 hours.
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