HTML Generation

\ `html DTMF Hand-Raise System wilio Conference Call Participants 5–7 callers + 1 host System Feasibility ✓ Still Fully Feasible 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 participant are transmitted as audio tones to the conference room — no server-side webhook fires. There is no native event for this. Why the V1 Pattern Fails The original document proposed nesting <Conference> inside <Gather> . This is structurally invalid. The Twilio TwiML schema enforces strict parent-child rules: TwiML Verb Valid Children Notes <