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Vapi Made Crystal Clear · chapter 1: The missed call

The three-hop pipeline

2026-08-27

Read that list again with a buyer's eye. You are not buying intelligence. The intelligence is OpenAI's or Anthropic's or Google's, and you pay them for it. You are buying the timing, the plumbing and the phone line. Figure 1.2 is that whole picture, and it is the schema every later diagram in this book zooms into.

Figure 1.2: The three-hop pipeline. Audio becomes text, text becomes a reply, the reply becomes audio, and the loop closes back on the caller. Every architecture diagram in the rest of this book is a zoom into one box on this track.
Figure 1.2: The three-hop pipeline. Audio becomes text, text becomes a reply, the reply becomes audio, and the loop closes back on the caller. Every architecture diagram in the rest of this book is a zoom into one box on this track.

This diagram is one of many in Vapi Made Crystal Clear.

Every chapter opens with the gist, draws the hard ideas, and ends with recipes and sources.

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