Real-time AI voice agents for inbound and outbound calls — answer, qualify, book, and transfer, in a natural voice, over your phone numbers. Full spoken reply in under 800 ms. First agent in 6–8 weeks, from $8K. Our work powers 600M+ call minutes a month.
If calls are piling up in a queue, going to voicemail after hours, or eating your team’s day with the same questions, an AI call agent answers on the first ring — and knows your systems.
A voicebot platform (Vapi, Retell, Bland) demos in a day but bills per minute and runs on their stack. More human agents means more cost and the same hold queue. A custom AI call agent answers every call, integrates your systems, and the per-call cost drops as you scale.
Keep humans for the hard, high-value calls. Let an AI agent take the repetitive ones — deflection, booking, qualification, after-hours — and warm-transfer the rest with full context. Building a web, video, or multimodal agent instead? See LiveKit AI agent development.
A phone agent has to answer in the rhythm of a real conversation — under a second per turn, with interruptions handled. Here is the loop we build.
Twilio Voice, Telnyx, FreeSWITCH, or LiveKit SIP brings the call in over PSTN or SIP, with your numbers and caller ID — inbound or outbound.
Semantic turn detection decides when the caller has finished, and barge-in lets them interrupt — so the agent never talks over them.
Deepgram Nova-3 (or Voice Agent) transcribes the caller live, robust to phone-line audio and accents.
The LLM (gpt-realtime, Gemini Live, or via Vapi/Retell/Pipecat) decides what to say, books, looks up, and writes to your CRM over tools/MCP.
ElevenLabs or Cartesia Sonic answers in a natural, branded voice, in the caller’s language.
The agent resolves the call, warm-transfers to a human with full context when needed, and logs the outcome to your CRM.
End to end, the agent’s full spoken reply lands in under 800 ms — the rhythm a caller expects from a person, not a robot.
Telephony at the edge, a tuned voice pipeline in the middle, and your systems behind it — that is what turns a voice demo into an agent that takes real calls.
Nucleus runs AI phone agents handling 600M+ call minutes a month for 5,000+ businesses, on WebRTC + SIP, SOC 2 / HIPAA / GDPR.
Lujo pools WhatsApp and phone into one queue, handles inbound calls, and transfers to specialists — 24/7 AI-assisted concierge.
A voice-to-text-to-voice AI assistant (ChatGPT + Azure) with multi-turn, contextual follow-ups.
An inbound agent that answers FAQs, looks up account state, and transfers to a human with context when it cannot resolve.
An outbound agent that qualifies leads, books meetings, and logs the call to your CRM.
An agent that covers nights, weekends, and call spikes so no call goes to voicemail.
A managed voicebot is the fastest way to a phone demo. A custom agent is how calls become a real channel — your telephony, your systems, your data, and a per-call cost that drops as you grow. Here is the split.
Keep humans on the high-value calls; let the agent take the rest. The free MVP planning below proves the latency on a real number first.
A full AI call agent end to end: telephony, voice pipeline, tools, transfer, deployed. You get the product and the code.
Drop an AI agent in front of your existing queue to deflect and qualify before a human picks up.
A voice agent that is slow, talks over callers, or mishandles transfers. We fix turn-taking, latency, and escalation.
Our voice-AI engineers join yours and build alongside you.
Fixed-scope starting points for an AI call agent. Each is a floor you build up from.
Telephony minutes and model/usage (STT, LLM, TTS) are billed at provider rates — no per-minute markup from us. We forecast them in the estimate.
Before the build, we will map the call flows and prove the latency on a real number.
Competitor analysis, core feature definition, monetization modeling, and a full launch blueprint — delivered within a week. Written by engineers who'll build what they plan.
An independent review of your system's technology choices, structural components, and workload fit — with a plain verdict on what's working, what's a liability, and exactly what to change to reach your goal. Delivered within a week.
A full audit of your code with every issue documented, evidenced, and located — exact file, exact line. Plus a system architecture review and a prioritized fix roadmap. Not a consultant's opinion. A case file. Delivered within a week.
A specialist review of your video or streaming product covering latency, media server architecture, WebRTC, playback reliability, real-time chat, and scalability. Every finding is specific, located, and fixable. Delivered within a week.
We have built AI phone agents that run at hundreds of millions of call minutes a month, on a national telecom network — not a demo line.
Two decades of real-time voice and telephony.
Nucleus runs AI phone agents at 600M+ call minutes a month for 5,000+ businesses; Lujo handles concierge calls 24/7.
Telephony, turn-taking, STT, LLM, voice, transfer — Twilio, Telnyx, SIP, Deepgram, gpt-realtime, ElevenLabs — built in-house.
Sub-800 ms full reply with barge-in, so callers do not feel they are talking to a machine.
CRM, booking, and lookups over tools and MCP, with warm transfer to humans.
Your code, your numbers, your call data, SOC 2 / HIPAA patterns. No per-minute platform tax.
The questions teams ask before they put an AI agent on the phone. The same answers power this page’s FAQ schema.
What is an AI call agent?
How fast does it reply?
Can it handle interruptions?
Which telephony does it use?
Can it use our CRM and book appointments?
Can it transfer to a human?
Which models and voices can it use?
How is this different from a LiveKit AI agent?
Is it compliant for healthcare or regulated calls?
What does it cost and how long does it take?
LiveKit AI agent development — voice, video & multimodal
See the pageAgentsAI video agent development
Read the guideGuideLiveKit AI agents: a build guide
Read the articleTell us the calls — inbound, outbound, the tools it needs. We will map the flow, pick the models, and give you a timeline and a number — in one call. Building a web, video, or multimodal agent instead? See LiveKit AI agents.
Specialist software house for video, real-time and AI products. Founded 2005. 50 in-house engineers.
