An AI agent that runs the phones for front office sales teams. It answers every inbound call, qualifies buyers through structured questions, books inspections into real calendar slots and logs a structured summary of every conversation with the transcript and recording attached.
A Melbourne high ticket sales business was missing inbound sales calls after hours and during peak periods. Every missed call was a lost lead, and staffing the phones around the clock was not viable.
- Telephony: Twilio SIP trunking routes calls to the agent
- Voice runtime: Retell handles speech to text, text to speech and real time inference
- LLM: GPT-5 mini for low latency voice turns
- Automation: N8N workflows log structured call summaries and book inspections through Calendly
- Logs: full transcript and recording stored for every call
prompts/system-prompt.txt is the production system prompt, templated for reuse. If you are building voice agents it is a useful place to start prompting:
- Slot capture, one question at a time, into a strict JSON schema: budget band, parking, timeframe, finance status, suburbs
- Pronunciation rules for prices and phone numbers in Australian English
- Small talk handled with a two turn budget, then a polite steer back to qualification
- Barge-in allowed, four second silence recovery, out of scope requests get a referral instead of an improvised answer
- STOP and opt-out requests logged as compliance flags
- Every call ends with a function call that logs the structured summary before hangup, never read aloud
The agent handles the full flow: greets, qualifies across nine slots, recommends stock against budget bands with an "indicative only" disclaimer, offers real inspection slots, confirms bookings with an ID, and the sales team walks into every conversation pre-briefed.
prompts/system-prompt.txt: templated production system promptconfig/n8n-workflow.json: logging and booking workflow, a simplified export for reference rather than the production graph
Gagan Dasari. I run GTMpro, an agentic GTM engineering practice in Melbourne. Switchboard is one of the systems in the catalogue.