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README.md
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README.md
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# node-sbc
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# NexusVoice SBC - Drachtio Migration
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Cyanet VoIP system. It handles all telephony communications, UA registers, presences, invites and media. Nexusvoice links users to Cyanet internal system with an API enabling provisionning, billing and charging.
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This directory contains the Drachtio-based implementation of the NexusVoice SIP Border Controller, migrated from the original Kamailio configuration.
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## Overview
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The Drachtio implementation provides equivalent functionality to the Kamailio SBC configuration:
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- **SIP Proxy and Registrar**: User registration and location management
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- **Security Features**: User-Agent filtering, SIP validation, request sanitization
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- **Call Routing**: Local user lookup, special number routing, external trunk integration
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- **Media Handling**: RTP proxy integration for media relay
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- **Logging**: Comprehensive SIP traffic logging
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## Directory Structure
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```
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drachtio-migration/
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├── config/
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│ └── default.json # Main configuration file
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├── middleware/
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│ ├── validation.js # Request validation middleware
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│ ├── userAgentFilter.js # User-Agent filtering middleware
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│ └── requestProcessor.js # Main request processing pipeline
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├── routes/
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│ ├── registration.js # SIP REGISTER handling
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│ ├── invite.js # SIP INVITE handling
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│ └── indialog.js # In-dialog request handling
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├── utils/
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│ └── logger.js # Logging utility
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├── server.js # Main server application
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├── package.json # Node.js dependencies
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└── README.md # This file
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```
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## Installation and Setup
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### Prerequisites
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- Node.js 14.0 or higher
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- Drachtio server installed and running
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- RTP proxy server (optional, for media handling)
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### Installation
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1. Navigate to the migration directory:
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```bash
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cd drachtio-migration
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```
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2. Install dependencies:
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```bash
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npm install
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```
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3. Configure your settings in `config/default.json`:
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- SIP listening parameters
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- RTP proxy configuration
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- Asterisk server addresses
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- Security settings
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### Configuration
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Key configuration sections:
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```json
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{
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"sip": {
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"host": "0.0.0.0",
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"port": 5060,
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"transport": "udp"
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},
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"rtpProxy": {
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"enabled": true,
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"host": "rtpproxy",
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"port": 7722
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},
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"security": {
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"enableUAFilter": true,
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"blockedUserAgents": [...],
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"allowedUserAgents": [...]
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}
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}
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```
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### Running the Server
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**Development mode:**
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```bash
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npm run dev
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```
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**Production mode:**
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```bash
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npm start
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```
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## Migration Mapping
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### Kamailio to Drachtio Equivalents
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| Kamailio Component | Drachtio Implementation |
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|-------------------|------------------------|
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| `request_route` | `RequestProcessor.middleware()` |
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| `route[REQINIT]` | `RequestValidator.middleware()` |
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| `route[UA_FILTER]` | `UserAgentFilter.middleware()` |
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| `route[REGISTRAR]` | `RegistrationHandler.handleRegister()` |
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| `route[INCOMING_INVITE]` | `InviteHandler.handleInvite()` |
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| `route[WITHINDLG]` | `InDialogHandler.handleInDialog()` |
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| `usrloc` module | `RegistrationHandler.registry` (in-memory Map) |
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| `rtpproxy` module | RTP proxy integration (placeholder) |
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| `dispatcher` module | Round-robin Asterisk server selection |
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### Key Differences
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1. **Configuration**: JSON-based instead of Kamailio script syntax
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2. **Language**: JavaScript/Node.js instead of Kamailio configuration language
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3. **Architecture**: Middleware pattern instead of procedural routes
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4. **Persistence**: In-memory registry instead of database-backed usrloc
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5. **Logging**: Winston-based logging instead of xlog
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## Features Implemented
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### ✅ Request Processing Pipeline
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- [x] Max-Forwards validation
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- [x] SIP message sanity checks
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- [x] Method-specific routing
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- [x] Enhanced logging
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- [x] Retransmission handling
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### ✅ Security Features
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- [x] User-Agent filtering with allow/block lists
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- [x] Empty User-Agent blocking
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- [x] Attack tool pattern detection
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- [x] Request validation and sanitization
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### ✅ Registration System
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- [x] SIP REGISTER handling
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- [x] In-memory user registry
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- [x] Registration expiry management
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- [x] Automatic cleanup of expired registrations
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### ✅ Call Routing
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- [x] Local user lookup
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- [x] Special number routing (3179, 8000, *600, 888)
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- [x] Asterisk server integration
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- [x] Round-robin load balancing
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### ✅ In-Dialog Handling
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- [x] BYE request processing
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- [x] ACK handling
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- [x] Route header processing
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- [x] Media teardown handling
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## Testing
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The migration is ready for functional testing. Key test scenarios:
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1. **Registration Tests**
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- User registration and authentication
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- Registration expiry and cleanup
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- Unregistration handling
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2. **Call Routing Tests**
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- Local user calls
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- Special number calls
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- External trunk routing
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3. **Security Tests**
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- User-Agent filtering
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- Request validation
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- Attack prevention
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4. **Media Tests**
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- RTP proxy integration
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- SDP processing
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## Next Steps
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### 🔄 In Progress
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- RTP proxy integration for media handling
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- SDP processing and modification
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- Media relay configuration
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### ⏳ Planned Features
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- Redis integration for multi-instance support
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- Enhanced logging and monitoring
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- API endpoints for management
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- Performance optimization
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- Load testing and validation
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## Troubleshooting
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### Common Issues
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1. **Port already in use**: Ensure no other SIP server is running on port 5060
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2. **Drachtio connection failed**: Verify drachtio server is running and accessible
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3. **Registration fails**: Check From header format and contact headers
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4. **Call routing fails**: Verify user registration and Asterisk server connectivity
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### Logs
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Check the logs directory for detailed information:
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```bash
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tail -f logs/sbc.log
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```
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## Contributing
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This migration maintains the same functionality as the original Kamailio configuration while leveraging Drachtio's modern JavaScript-based architecture. All existing features should work equivalently.
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