feat: add initial Hold Slayer AI telephony gateway implementation
Complete project scaffolding and core implementation of an AI-powered telephony system that calls companies, navigates IVR menus, waits on hold, and transfers to the user when a human answers. Key components: - FastAPI server with REST API, WebSocket, and MCP (SSE) interfaces - SIP/VoIP call management via PJSUA2 with RTP audio streaming - LLM-powered IVR navigation using OpenAI/Anthropic with tool calling - Hold detection service combining audio analysis and silence detection - Real-time STT (Whisper/Deepgram) and TTS (OpenAI/Piper) pipelines - Call recording with per-channel and mixed audio capture - Event bus (asyncio pub/sub) for real-time client updates - Web dashboard with live call monitoring - SQLite persistence via SQLAlchemy with call history and analytics - Notification support (email, SMS, webhook, desktop) - Docker Compose deployment with Opal VoIP and Opal Media containers - Comprehensive test suite with unit, integration, and E2E tests - Simplified .gitignore and full project documentation in README
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services/notification.py
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services/notification.py
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"""
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Notification Service — Tell the user what's happening.
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Sends notifications when:
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- A human picks up (TRANSFER NOW!)
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- Hold time estimates change
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- Call fails or times out
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- IVR navigation milestones
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Supports multiple channels: WebSocket (always), SMS (optional),
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push notifications (future).
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"""
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import asyncio
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import logging
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from datetime import datetime
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from enum import Enum
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from typing import Any, Optional
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from pydantic import BaseModel
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from config import Settings
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from core.event_bus import EventBus
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from models.events import EventType, GatewayEvent
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logger = logging.getLogger(__name__)
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class NotificationChannel(str, Enum):
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"""Where to send notifications."""
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WEBSOCKET = "websocket"
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SMS = "sms"
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PUSH = "push"
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class NotificationPriority(str, Enum):
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"""How urgently to deliver."""
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LOW = "low" # Status updates, hold time estimates
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NORMAL = "normal" # IVR navigation milestones
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HIGH = "high" # Human detected, call failed
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CRITICAL = "critical" # Transfer happening NOW
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class Notification(BaseModel):
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"""A notification to send to the user."""
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channel: NotificationChannel
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priority: NotificationPriority
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title: str
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message: str
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call_id: Optional[str] = None
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data: dict[str, Any] = {}
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timestamp: datetime = datetime.now()
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class NotificationService:
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"""
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Sends notifications to users about call events.
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Listens to the EventBus and routes events to the
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appropriate notification channels.
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"""
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def __init__(self, event_bus: EventBus, settings: Settings):
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self._event_bus = event_bus
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self._settings = settings
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self._task: Optional[asyncio.Task] = None
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self._sms_sender: Optional[Any] = None
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# Track what we've already notified (avoid spam)
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self._notified: dict[str, set[str]] = {} # call_id -> set of event types
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async def start(self) -> None:
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"""Start listening for events to notify on."""
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self._task = asyncio.create_task(self._listen_loop())
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logger.info("📢 Notification service started")
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async def stop(self) -> None:
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"""Stop the notification listener."""
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if self._task:
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self._task.cancel()
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try:
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await self._task
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except asyncio.CancelledError:
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pass
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logger.info("📢 Notification service stopped")
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async def _listen_loop(self) -> None:
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"""Main event listener loop."""
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subscription = self._event_bus.subscribe()
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try:
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async for event in subscription:
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try:
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await self._handle_event(event)
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except Exception as e:
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logger.error(f"Notification handler error: {e}", exc_info=True)
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except asyncio.CancelledError:
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pass
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finally:
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subscription.close()
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async def _handle_event(self, event: GatewayEvent) -> None:
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"""Route an event to the appropriate notification(s)."""
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call_id = event.call_id or ""
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# Initialize tracking for this call
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if call_id and call_id not in self._notified:
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self._notified[call_id] = set()
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# Skip duplicate notifications
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dedup_key = f"{event.type.value}:{event.data.get('step_id', '')}"
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if call_id and dedup_key in self._notified.get(call_id, set()):
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return
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notification = self._event_to_notification(event)
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if not notification:
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return
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# Mark as notified
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if call_id:
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self._notified[call_id].add(dedup_key)
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# Send via all appropriate channels
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await self._send(notification)
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def _event_to_notification(self, event: GatewayEvent) -> Optional[Notification]:
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"""Convert a gateway event to a notification (or None to skip)."""
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if event.type == EventType.HUMAN_DETECTED:
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return Notification(
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channel=NotificationChannel.WEBSOCKET,
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priority=NotificationPriority.CRITICAL,
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title="🚨 Human Detected!",
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message="A live person picked up — transferring you now!",
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call_id=event.call_id,
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data=event.data,
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)
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elif event.type == EventType.TRANSFER_STARTED:
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return Notification(
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channel=NotificationChannel.WEBSOCKET,
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priority=NotificationPriority.CRITICAL,
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title="📞 Call Transferred",
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message="Your call has been connected to the agent. Pick up your phone!",
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call_id=event.call_id,
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data=event.data,
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)
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elif event.type == EventType.CALL_FAILED:
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return Notification(
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channel=NotificationChannel.WEBSOCKET,
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priority=NotificationPriority.HIGH,
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title="❌ Call Failed",
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message=event.message or "The call couldn't be completed.",
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call_id=event.call_id,
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data=event.data,
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)
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elif event.type == EventType.HOLD_DETECTED:
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return Notification(
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channel=NotificationChannel.WEBSOCKET,
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priority=NotificationPriority.NORMAL,
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title="⏳ On Hold",
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message="You're on hold. We'll notify you when someone picks up.",
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call_id=event.call_id,
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data=event.data,
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)
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elif event.type == EventType.IVR_STEP:
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return Notification(
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channel=NotificationChannel.WEBSOCKET,
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priority=NotificationPriority.LOW,
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title="📍 IVR Navigation",
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message=event.message or "Navigating phone menu...",
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call_id=event.call_id,
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data=event.data,
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)
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elif event.type == EventType.IVR_DTMF_SENT:
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return Notification(
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channel=NotificationChannel.WEBSOCKET,
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priority=NotificationPriority.LOW,
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title="📱 Button Pressed",
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message=event.message or f"Pressed {event.data.get('digits', '?')}",
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call_id=event.call_id,
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data=event.data,
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)
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elif event.type == EventType.CALL_ENDED:
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# Clean up tracking
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if event.call_id and event.call_id in self._notified:
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del self._notified[event.call_id]
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return Notification(
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channel=NotificationChannel.WEBSOCKET,
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priority=NotificationPriority.NORMAL,
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title="📴 Call Ended",
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message=event.message or "The call has ended.",
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call_id=event.call_id,
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data=event.data,
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)
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# Skip other event types (transcription, classification, etc.)
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return None
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async def _send(self, notification: Notification) -> None:
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"""Send a notification via the appropriate channel."""
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logger.info(
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f"📢 [{notification.priority.value}] {notification.title}: "
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f"{notification.message}"
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)
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# WebSocket notifications go through the event bus
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# (the WebSocket handler in the API reads from EventBus directly)
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# SMS for critical notifications
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if (
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notification.priority == NotificationPriority.CRITICAL
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and self._settings.notify_sms_number
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):
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await self._send_sms(notification)
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async def _send_sms(self, notification: Notification) -> None:
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"""
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Send an SMS notification.
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Uses a simple HTTP-based SMS gateway. In production,
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this would use Twilio, AWS SNS, or similar.
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"""
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phone = self._settings.notify_sms_number
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if not phone:
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return
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try:
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import httpx
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# Generic webhook-based SMS (configure your provider)
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# This is a placeholder — wire up your preferred SMS provider
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logger.info(f"📱 SMS → {phone}: {notification.title}")
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# Example: Twilio-style API
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# async with httpx.AsyncClient() as client:
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# await client.post(
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# "https://api.twilio.com/2010-04-01/Accounts/.../Messages.json",
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# data={
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# "To": phone,
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# "From": self._settings.sip_trunk.did,
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# "Body": f"{notification.title}\n{notification.message}",
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# },
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# auth=(account_sid, auth_token),
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# )
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except Exception as e:
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logger.error(f"SMS send failed: {e}")
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