ADK Voice Agent – Test Console
Call Target
Phone Number (E.164)
Provider
Twilio
Telnyx
Model & Voice
Model
Default (from env)
gemini-live-2.5-flash-native-audio (GA)
gemini-2.5-flash-native-audio-preview-09-2025
Voice
Default (from env)
Zephyr
Puck
Charon
Kore
Fenrir
Aoede
Leda
Orus
Perseus
Welcome Message (TTS greeting – leave blank for agent-generated)
Pre-synthesised via Google TTS and played instantly before the agent starts
Thinking
Enable Thinking (dynamic thinking is on by default)
Thinking Budget
1024
Include Thought Summaries
Voice Activity Detection (VAD)
Enable Automatic VAD
Start-of-Speech Sensitivity
HIGH
LOW
End-of-Speech Sensitivity
HIGH
LOW
Prefix Padding (ms)
20
Silence Duration (ms)
100
Native Audio Features
Affective Dialog (emotion-aware responses)
Proactive Audio (model decides when to respond)
Transcription
Input Audio Transcription (user speech)
Output Audio Transcription (agent speech)
Context Window Compression
Enable Context Compression
Trigger Tokens
Compression kicks in at this token count
Target Tokens (sliding window)
Tokens to keep after compression
Trigger Outbound Call