Outbound Voice Agents

Voice agents that place calls on behalf of a business — lead qualification, review collection, reactivation, surveys. Triggered by an event (form submission, CRM update) and driven by a create-call API that passes runtime variables into the system prompt so each call is personalised.

Key points

• Reference use case: lead qualification after a web form submission — the agent calls the prospect, confirms identity, qualifies intent, budget, timing and past experience, then logs everything to a Google sheet
• Requires phone number normalisation before calling Vapi's create-call endpoint — strip punctuation, enforce 10-digit format, country-code handling
• Vapi's create-call only returns an acknowledgement — you must poll with GET on the call ID until status = ended, then branch on ended_reason to detect voicemail
• Assistant overrides inject dynamic variables (lead name, company, request) into the system prompt via {{variable}} syntax at call time
• Vapi-owned numbers have a daily outbound call limit; importing Twilio numbers removes it

Related entities

• Vapi

Related concepts

• Voice Agents

Source references

• ^[src-007] Nate Herk cluster — Nate Herk — Voice AI agents cluster (4 videos)

– Videos referenced: BO-jFbN4p8Y