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\ `html Twilio Conference Call DTMF Hand-Raise System Corrected technical research: feasibility issues with the original approach, verified working patterns, 5 alternative architectures, and an implementation recommendation matrix for the muted-conference hand-raise use case. Participants 5–7 callers + 1 host Core Correction Gather cannot wrap Conference Recommended Production Path Media Streams + DTMF Detection System Feasibility ✓ Still Fully Feasible Table of Contents 01 The Core TwiML Constraint corrected 02 Verified Working Patterns POC 03 Alternative 1: Media Streams + Goertzel 04 Alternative 2: Twilio Flex / TaskRouter 05 Alternative 3: Twilio Sync State 06 Alternative 4: Conference Hold + Gather 07 Alternative 5: Dual-Channel (Phone + Web) 08 Decision Matrix & Recommendation 01 The Core TwiML Constraint — What V1 Got Wrong ❌ Root Problem Twilio’s TwiML specification does NOT allow DTMF detection while a caller is inside a <Dial><Conference> . Any keypad digits pressed by a part