Hey everyone, I wanted to share a technical issue that VAPI support confirmed exists in their platform — in case others are hitting the same wall and don't know why. The bug: VAPI's native Telnyx integration hardcodes mu-law (PCMU) decoding for all calls. But European telephony networks (Spain, France, Germany, etc.) use A-law (PCMA) encoding. Result: every inbound audio stream from a European caller is decoded with the wrong codec → heavy static → the AI transcriber (ASR) can't understand anything → silence timeout → call drops. What makes it hard to diagnose: - The outbound audio (AI → user) sounds perfect - Telnyx network metrics are clean (MOS 4.50, jitter 0ms, 0% packet loss) - The problem only shows in the VAPI call recording on the user's voice track What I've already ruled out: - Telnyx codec settings (tested G711A only, G711A + OPUS) - Noise suppression (tested all combinations) - Network / WiFi / SIP ALG - Media region (separately flagged to VAPI — all our EU calls route through AWS us-west-2 Oregon) VAPI support confirmed the bug on March 25. No fix or workaround provided yet (as of March 26). If anyone has found a workaround — SIP trunk config, alternative Telnyx setup, different carrier — I'd genuinely appreciate it.