What we learn building and testing AI receptionists on Retell for small businesses.https://volunteer-ai.com/https://volunteer-ai.com/blog/private-demo-line-caller-id-routing/https://volunteer-ai.com/blog/private-demo-line-caller-id-routing/How I give each prospect a private AI receptionist demo that answers with their own business name, on one shared Retell number, and how those demos clean up after themselves.Mon, 05 Oct 2026 00:00:00 GMThttps://volunteer-ai.com/blog/how-i-built-kate/https://volunteer-ai.com/blog/how-i-built-kate/Kate is an outbound Retell agent I can start from my iPhone. How it tells a person from a phone menu, the three ways I trigger it, and the bugs that only real calls found.Fri, 02 Oct 2026 00:00:00 GMThttps://volunteer-ai.com/blog/teaching-a-voice-agent-to-wait/https://volunteer-ai.com/blog/teaching-a-voice-agent-to-wait/Our outbound Retell assistant talked into hold silence and over the people it called. Here is what fixed it, the API details that nearly bit us, and how playbooks now swap in per call.Thu, 01 Oct 2026 00:00:00 GMThttps://volunteer-ai.com/blog/kanban-user-stories-for-voice-agents/https://volunteer-ai.com/blog/kanban-user-stories-for-voice-agents/How Volunteer AI runs every Retell voice receptionist through a seven-column board and user-story-shaped test cases, so 'sounds good on the phone' isn't the bar for shipping.Fri, 25 Sep 2026 00:00:00 GMThttps://volunteer-ai.com/blog/testing-retell-agents-against-caller-truth/https://volunteer-ai.com/blog/testing-retell-agents-against-caller-truth/Our Retell test suite passed while an agent promised a booking update it never sent. Here is the bug, the fix, and how we rewrote the tests so it can't hide again.Sat, 19 Sep 2026 00:00:00 GMT