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Dev.to
7/10/2026
The original title is "How I Built an AI Voicemail System in 118 Lines (And What Surprised Me)"

The original title is "How I Built an AI Voicemail System in 118 Lines (And What Surprised Me)"

Original: How I Built an AI Voicemail System in 118 Lines (And What Surprised Me)

Short summary

A developer shares a detailed build of an AI voicemail system using Telnyx's voice, SMS, and AI inference APIs, uncovering twelve bugs in Telnyx's official 'production-ready' code examples. Key lessons include SDK method name mismatches, unexpected webhook timing for transcription delivery, and reasoning-token budget issues with Kimi-K2.6 truncating JSON output. The post is a practical reminder to treat even authoritative example code skeptically.

  • •Built AI voicemail system with Telnyx voice/SMS/AI inference APIs
  • •Found 12 bugs in Telnyx's official production-ready examples
  • •Reasoning tokens in Kimi-K2.6 silently truncated JSON output under tight max_tokens

Generated with AI, which can make mistakes.

#ai-tools#ai-agents#open-source
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