# SIP Plugin Optimization - Implementation Summary

## Quick Reference

| Aspect | Current (v1.0) | Optimized (v2.0) |
|--------|---------------|------------------|
| Architecture | Service-oriented | Layered + Repository |
| Files | 17 files | 25+ files (better organized) |
| Security | Weak encryption | Proper secrets + rate limiting |
| Performance | No pooling | Connection pooling + caching |
| Scalability | Mixed concerns | Event-driven + stateless |
| Error Handling | Inconsistent | Centralized |

## Key Files Created

```
plugins/free-pbx/
├── README.md                    # Full architecture plan
├── IMPLEMENTATION.md            # This file
├── migrations/
│   ├── 002_sip_tables_v2.sql   # Optimized database schema
│   └── 001_sip_tables.sql       # Original (kept for reference)
├── core/
│   ├── event-bus.ts            # Domain event system
│   ├── call-manager.ts         # Call orchestration
│   ├── audio-processor.ts      # Codec conversion (TODO)
│   └── sip-manager.ts          # SIP registration (TODO)
├── repositories/
│   ├── base.repository.ts      # Base repository with CRUD
│   ├── extension.repository.ts (TODO)
│   ├── call.repository.ts      (TODO)
│   └── connection.repository.ts (TODO)
└── services/ (refactor existing)
```

## Installation Steps

### 1. Apply Optimized Database Migration
```bash
psql -U postgres -d halavoice -f plugins/free-pbx/migrations/002_sip_tables_v2.sql
```

### 2. Install Additional Dependencies
```bash
npm install node-cache ws ioredit
npm install -D @types/ws
```

### 3. Register Plugin in Server
Add to `server/index.ts`:
```typescript
import { registerFreePBXSIPRoutes } from './plugins/free-pbx';

// In app setup
registerFreePBXSIPRoutes(app, {
  sessionAuthMiddleware: sessionAuth,
  adminAuthMiddleware: requireAdmin,
  httpServer: server
});
```

## API Endpoint Summary

### Admin (`/api/admin/sip`)
| Method | Endpoint | Description |
|--------|----------|-------------|
| GET | `/connections` | List connections |
| POST | `/connections` | Create connection |
| PUT | `/connections/:id` | Update connection |
| DELETE | `/connections/:id` | Delete connection |
| POST | `/connections/:id/test` | Test connection |
| POST | `/connections/:id/sync` | Sync extensions |
| GET | `/extensions` | List extensions |
| GET | `/assignments` | List assignments |
| POST | `/assignments` | Create assignment |
| DELETE | `/assignments/:id` | Remove assignment |
| GET | `/calls` | List all calls |
| GET | `/analytics` | Dashboard stats |

### User (`/api/sip`)
| Method | Endpoint | Description |
|--------|----------|-------------|
| GET | `/extensions` | Browse available |
| POST | `/requests` | Request extension |
| GET | `/my-extensions` | My extensions |
| GET | `/calls` | My call history |
| POST | `/calls/initiate` | Start call |

### Webhooks (`/api/webhooks/sip`)
| Method | Endpoint | Description |
|--------|----------|-------------|
| POST | `/call/start` | Call initiated |
| POST | `/call/answer` | Call answered |
| POST | `/call/end` | Call ended |
| POST | `/recording` | Recording ready |

### WebSocket (`/ws/sip`)
Real-time audio streaming for active calls.

## Environment Variables

```bash
# Required
SIP_ENCRYPTION_KEY=<32-byte-hex-key>

# Optional
FREEPBX_DEFAULT_PORT=5038
FREEPBX_DEFAULT_TIMEOUT=5000
WS_PING_INTERVAL=30000
RATE_LIMIT_WINDOW=60000
RATE_LIMIT_MAX=100
```

## Event Bus Usage

```typescript
import { emitSIPEvent, onSIPEvent } from './plugins/free-pbx/core/event-bus';

// Emit event
await emitSIPEvent('call:initiated', {
  callId: 'xxx',
  extension: '1001',
  destination: '+1234567890'
});

// Subscribe to event
onSIPEvent('call:ended', async ({ callId, duration }) => {
  console.log(`Call ${callId} ended after ${duration}s`);
});
```

## Repository Usage

```typescript
import { ExtensionRepository } from './plugins/free-pbx/repositories';

const repo = new ExtensionRepository();

// Find available extensions
const available = await repo.findAvailable({
  groupId: 'default-group',
  status: 'available'
});

// Paginated results
const result = await repo.findPaginated({
  page: 1,
  limit: 20,
  where: eq(sip_extensions.status, 'available'),
  orderBy: desc(sip_extensions.createdAt)
});
```

## Migration from v1.0

1. **Backup database**
2. **Run v2.0 migration**
3. **Update imports** in existing code
4. **Test thoroughly**

## Implementation Priority

### Phase 1: Critical (Week 1)
- [x] Create optimized database schema
- [x] Create base repository
- [x] Create event bus
- [ ] Create call manager
- [ ] Add security middleware

### Phase 2: Core (Week 2)
- [ ] Refactor extension service
- [ ] Refactor connection service
- [ ] Create repositories
- [ ] Add audio processor

### Phase 3: Integration (Week 3)
- [ ] Refactor routes
- [ ] WebSocket handler
- [ ] Webhook verification
- [ ] OpenAI integration

### Phase 4: Polish (Week 4)
- [ ] Testing
- [ ] Documentation
- [ ] Performance tuning
- [ ] Security audit

## Support

For issues or questions:
1. Check README.md for full documentation
2. Review event types in core/event-bus.ts
3. See base.repository.ts for data access patterns