SIP and WebRTC Voice Framework.
Built-in AI support.

# Build and run
go build -o voiceblender ./cmd/voiceblender
./voiceblender

# Or run directly
go run ./cmd/voiceblender

# REST API on :8080, SIP on 127.0.0.1:5060

1. Register a webhook        POST /v1/webhooks
2. Receive inbound call      --> webhook: leg.ringing {leg_id, from, to}
3. Answer                    POST /v1/legs/{id}/answer
4. Create a room             POST /v1/rooms
5. Add legs to room          POST /v1/rooms/{id}/legs
6. Attach AI agent           POST /v1/legs/{id}/agent
7. Start recording           POST /v1/legs/{id}/record
8. Hang up                   DELETE /v1/legs/{id}

POST   /v1/legs                    # Originate outbound SIP call
GET    /v1/legs                    # List all legs
POST   /v1/legs/{id}/answer        # Answer ringing inbound leg
POST   /v1/legs/{id}/early-media   # Enable early media (183)
DELETE /v1/legs/{id}               # Hang up
POST   /v1/legs/{id}/dtmf          # Send DTMF digits
POST   /v1/legs/{id}/play          # Play audio or tone
POST   /v1/legs/{id}/tts           # Text-to-speech
POST   /v1/legs/{id}/record        # Start recording
POST   /v1/legs/{id}/stt           # Start speech-to-text
POST   /v1/legs/{id}/agent         # Attach AI agent

POST   /v1/rooms                   # Create room
GET    /v1/rooms                   # List rooms
DELETE /v1/rooms/{id}              # Delete room (hangs up all legs)
POST   /v1/rooms/{id}/legs         # Add leg to room
GET    /v1/rooms/{id}/ws           # Join room via WebSocket
POST   /v1/rooms/{id}/play         # Play audio or tone to room
POST   /v1/rooms/{id}/tts          # TTS to room
POST   /v1/rooms/{id}/record       # Record room mix
POST   /v1/rooms/{id}/agent        # Attach AI agent to room

export HTTP_ADDR=:8080              # REST API listen address
export SIP_BIND_IP=127.0.0.1       # IP for SDP/Contact/Via headers
export SIP_PORT=5060                # SIP listen port
export ICE_SERVERS=stun:stun.l.google.com:19302
export RECORDING_DIR=/tmp/recordings
export LOG_LEVEL=info               # debug, info, warn, error
export WEBHOOK_URL=https://example.com/hooks
export ELEVENLABS_API_KEY=sk-...    # TTS, STT, Agent
export VAPI_API_KEY=...             # VAPI Agent provider
export S3_BUCKET=my-recordings      # Optional S3 upload

# WebRTC
POST   /v1/webrtc/offer                 # SDP offer/answer exchange
POST   /v1/legs/{id}/ice-candidates     # Add trickle ICE candidate
GET    /v1/legs/{id}/ice-candidates     # Get gathered ICE candidates

# Webhooks
POST   /v1/webhooks             # Register webhook
GET    /v1/webhooks             # List webhooks
DELETE /v1/webhooks/{id}        # Unregister webhook