# 02 - Milestone 2.1 Revision & Verification

## Key Takeaways

1. **Dual WebSocket Design:** `WS /ws/session/{sessionId}` handles visitor presence & incoming agent messages; `WS /ws/agent` streams real-time events to all active agent dashboards.
2. **Presence State Store:** In-memory registry (`active_sessions`) tracks connection state, IP address, resolved country, user info, session status (`RINGING`, `IN_CHAT`, `ENDED`), and `endedBy` role.
3. **Automated Ringing Chime:** Agent dashboard plays Web Audio chime synthesized via Web Audio API whenever a visitor session status is `RINGING`.

---

## Verification & Test Results

Run the full pytest suite:
```bash
cd backend
.\venv\Scripts\python.exe -m pytest
```

Result:
```text
======================= 22 passed, 4 warnings in 0.42s ========================
```