I can use text to get audio response and barge in

.env.example

@@ -0,0 +1,30 @@
+# Server Configuration
+HOST=0.0.0.0
+PORT=8000
+
+# Audio Configuration
+SAMPLE_RATE=16000
+CHUNK_SIZE_MS=20
+
+# VAD Configuration
+VAD_THRESHOLD=0.5
+VAD_EOU_THRESHOLD_MS=400
+
+# OpenAI / LLM Configuration (required for duplex voice)
+OPENAI_API_KEY=sk-your-openai-api-key-here
+# OPENAI_API_URL=https://api.openai.com/v1  # Optional: for Azure or compatible APIs
+LLM_MODEL=gpt-4o-mini
+LLM_TEMPERATURE=0.7
+
+# TTS Configuration
+TTS_VOICE=en-US-JennyNeural
+TTS_SPEED=1.0
+
+# Duplex Pipeline Configuration
+DUPLEX_ENABLED=true
+# DUPLEX_GREETING=Hello! How can I help you today?
+DUPLEX_SYSTEM_PROMPT=You are a helpful, friendly voice assistant. Keep your responses concise and conversational.
+
+# Logging
+LOG_LEVEL=INFO
+LOG_FORMAT=text