Advanced Features

Unlock the full potential of VEXYL with advanced capabilities like VAD tuning, Barge-in, and HITL transfers.

Voice Activity Detection (VAD)

VEXYL uses Silero VAD v5. You can tune sensitivity for noisy environments or slow speakers.

VAD_POSITIVE_THRESHOLD=0.5
VAD_NEGATIVE_THRESHOLD=0.35
VAD_REDEMPTION_FRAMES=8  # 768ms pause tolerance

Allow users to interrupt the AI while it's speaking. The system stops audio playback immediately upon detecting speech.

ENABLE_BARGE_IN=true
BARGE_IN_THRESHOLD=500

Enable the LLM to transfer calls to human agents or other queues.

TRANSFER_ENABLED=true
TRANSFER_ENDPOINT=http://your-server/transfer.php

Store custom data (Caller ID, Account Number) with the session to be used by the LLM context.

curl -X POST .../session/{id}/metadata -d "name=John&account=123"