The real cost of a missed call
A missed call outside business hours is often a customer lost to a reachable competitor. Happi Secretary addresses exactly that: a 24/7 AI voice secretary capable of holding a real conversation, not just an answering machine that takes a message.
A stack built for latency
In AI telephony, latency is what gives a bot away. Our stack combines Vapi.ai for call infrastructure (under 500ms latency), Deepgram for speech recognition, and ElevenLabs for natural voice synthesis. Below that 500ms threshold, the conversation stays fluid; above it, the caller can feel they're talking to a machine.
A call's journey, end to end
Concretely, here is what happens between the phone ringing and the call ending:
- The caller is greeted, with immediate recognition if they're a VIP client
- Claude analyses the request in real time and decides the action: booking an appointment, transferring, or taking a message
- For an appointment, the assistant checks real availability via Cal.com and confirms live, during the call
- At the end of the call, Claude generates a summary, detects sentiment (positive, neutral, negative, urgent), and triggers an email + SMS summary
What the assistant can do
- 24/7 inbound call answering
- FAQ powered by your knowledge base (PDF, URL, text)
- Smart routing to the right person with context summary
- Automatic escalation for out-of-scope requests (L1 support)
- Sentiment detection and urgent call prioritisation
- Webhook to your CRM (HubSpot, Pipedrive, Zapier, Make)
- Automatic language detection (FR/EN/ES)
Why Claude for post-call analysis
We tested Claude and GPT-4o on this specific task before deciding (full detail in our complete comparison). For summarising a call against a precise grid — intent, sentiment, outcome, next action — Claude was more consistent call to call, which matters when the summary goes straight to the client by email.
Try it yourself
Rather than a scripted demo, we put a simplified version of this conversation engine online, directly testable in your browser: try the live secretary agent. Type as if you were calling, and watch the analysis card generate itself at the end of the exchange.