Asterisk Realtime PBX with WebRTC Softphone
Cloud-based multi-tenant PBX system with MySQL Realtime architecture and browser-based WebRTC calling. Zero-downtime provisioning, 500+ concurrent calls, 99.9% uptime.
<div class="space-y-6">
<div class="prose prose-invert max-w-none">
<h2>🎯 Project Overview</h2>
<p>
Designed and deployed a <strong>production-grade, cloud-based PBX system</strong> using Asterisk with MySQL Realtime architecture,
enabling dynamic configuration without service restarts. The system features browser-based WebRTC softphones with secure WSS signaling,
making it accessible from anywhere without installing client software.
</p>
<h3>💼 Business Impact</h3>
<ul>
<li><strong>Zero-downtime provisioning:</strong> Add/modify extensions instantly without PBX reload</li>
<li><strong>Reduced client costs:</strong> Eliminated need for physical desk phones and software licenses</li>
<li><strong>Multi-tenant ready:</strong> Single infrastructure serving multiple organizations securely</li>
<li><strong>Global accessibility:</strong> Employees can make/receive calls from any device with a browser</li>
<li><strong>99.9% uptime:</strong> High-availability configuration with automated failover</li>
</ul>
<h2>🛠️ Technical Architecture</h2>
<h3>Core Technologies</h3>
<ul>
<li><strong>Asterisk 20.x</strong> - Core PBX engine with PJSIP stack</li>
<li><strong>MySQL 8.0</strong> - Realtime configuration database</li>
<li><strong>WebRTC</strong> - Browser-based calling (DTLS-SRTP encryption)</li>
<li><strong>WSS (Secure WebSockets)</strong> - Encrypted signaling on port 8089</li>
<li><strong>Laravel 11</strong> - Admin portal for provisioning and management</li>
<li><strong>Let's Encrypt</strong> - Automated SSL certificate management</li>
<li><strong>Kamailio</strong> - SIP proxy for load balancing (multi-server setup)</li>
</ul>
<h3>Key Features Implemented</h3>
<div class="bg-gray-800 p-4 rounded-lg my-4">
<h4 class="text-green-400 mb-2">✅ Real-Time Configuration</h4>
<p>All SIP endpoints, authentication, and routing stored in MySQL. Changes reflect instantly—no asterisk reloads needed.</p>
</div>
<div class="bg-gray-800 p-4 rounded-lg my-4">
<h4 class="text-blue-400 mb-2">✅ WebRTC Softphone Integration</h4>
<p>Browser-based calling using JsSIP library. Users log in to web portal and make calls directly—no downloads required.</p>
</div>
<div class="bg-gray-800 p-4 rounded-lg my-4">
<h4 class="text-purple-400 mb-2">✅ Multi-Tenant Architecture</h4>
<p>Isolated contexts per client with dedicated DIDs, extensions, and routing rules. Single server infrastructure, multiple organizations.</p>
</div>
<div class="bg-gray-800 p-4 rounded-lg my-4">
<h4 class="text-yellow-400 mb-2">✅ Advanced Call Routing</h4>
<p>Time-based routing, IVR menus, queue management, voicemail-to-email, and automatic call distribution.</p>
</div>
<h2>🔧 Technical Challenges Solved</h2>
<div class="border-l-4 border-yellow-500 pl-4 my-4">
<h4 class="font-bold">NAT Traversal for WebRTC</h4>
<p><strong>Challenge:</strong> WebRTC clients behind different NAT types couldn't establish media connections.</p>
<p><strong>Solution:</strong> Configured STUN/TURN servers (coturn), implemented ICE candidate gathering, and properly set external_media_address in Asterisk.</p>
</div>
<div class="border-l-4 border-yellow-500 pl-4 my-4">
<h4 class="font-bold">SSL Certificate Management</h4>
<p><strong>Challenge:</strong> WebRTC requires HTTPS/WSS. Managing certificates for multiple client domains was complex.</p>
<p><strong>Solution:</strong> Automated Let's Encrypt integration with wildcard certificates and cron-based auto-renewal. Built certificate deployment system in Laravel.</p>
</div>
<div class="border-l-4 border-yellow-500 pl-4 my-4">
<h4 class="font-bold">Database Connection Pooling</h4>
<p><strong>Challenge:</strong> High call volume caused MySQL connection exhaustion.</p>
<p><strong>Solution:</strong> Implemented connection pooling in Asterisk res_odbc, optimized queries with proper indexes, and added read replicas for scalability.</p>
</div>
<h2>📊 Performance Metrics</h2>
<div class="grid grid-cols-2 md:grid-cols-4 gap-4 my-4">
<div class="bg-gray-800 p-4 rounded text-center">
<div class="text-3xl font-bold text-green-400">500+</div>
<div class="text-sm">Concurrent Calls</div>
</div>
<div class="bg-gray-800 p-4 rounded text-center">
<div class="text-3xl font-bold text-blue-400"><100ms</div>
<div class="text-sm">Call Setup Time</div>
</div>
<div class="bg-gray-800 p-4 rounded text-center">
<div class="text-3xl font-bold text-purple-400">99.9%</div>
<div class="text-sm">Uptime SLA</div>
</div>
<div class="bg-gray-800 p-4 rounded text-center">
<div class="text-3xl font-bold text-yellow-400">2000+</div>
<div class="text-sm">Registered Users</div>
</div>
</div>
<h2>💡 Innovations</h2>
<ul>
<li><strong>API-First Design:</strong> RESTful API for programmatic provisioning—integrated with CRM systems</li>
<li><strong>Real-Time Dashboard:</strong> Live call monitoring via AMI + WebSockets showing active calls, queue stats, agent status</li>
<li><strong>Automated Backup:</strong> Hourly database snapshots with point-in-time recovery capability</li>
<li><strong>CDR Analytics:</strong> Call detail records processed into business intelligence dashboards</li>
<li><strong>Emergency Failover:</strong> Automated detection and routing to backup server in <30 seconds</li>
</ul>
<h2>🚀 Results</h2>
<ul>
<li>✅ Deployed to <strong>15+ organizations</strong> across healthcare, finance, and e-commerce</li>
<li>✅ Handling <strong>50,000+ calls/month</strong> with zero-downtime maintenance</li>
<li>✅ Reduced client telecommunications costs by <strong>60-70%</strong> vs traditional PBX</li>
<li>✅ Enabled <strong>remote work</strong> during pandemic with browser-based calling</li>
<li>✅ Integrated with <strong>CRM systems</strong> (Salesforce, HubSpot) for click-to-dial</li>
</ul>
<h2>🔗 Related Content</h2>
<p>Read the full technical deep-dive: <a href="/blog/building-realtime-asterisk-pbx-mysql-webrtc" class="text-blue-400 hover:underline">Building Realtime Asterisk PBX with MySQL and WebRTC</a></p>
</div>
</div>
<div class="prose prose-invert max-w-none">
<h2>🎯 Project Overview</h2>
<p>
Designed and deployed a <strong>production-grade, cloud-based PBX system</strong> using Asterisk with MySQL Realtime architecture,
enabling dynamic configuration without service restarts. The system features browser-based WebRTC softphones with secure WSS signaling,
making it accessible from anywhere without installing client software.
</p>
<h3>💼 Business Impact</h3>
<ul>
<li><strong>Zero-downtime provisioning:</strong> Add/modify extensions instantly without PBX reload</li>
<li><strong>Reduced client costs:</strong> Eliminated need for physical desk phones and software licenses</li>
<li><strong>Multi-tenant ready:</strong> Single infrastructure serving multiple organizations securely</li>
<li><strong>Global accessibility:</strong> Employees can make/receive calls from any device with a browser</li>
<li><strong>99.9% uptime:</strong> High-availability configuration with automated failover</li>
</ul>
<h2>🛠️ Technical Architecture</h2>
<h3>Core Technologies</h3>
<ul>
<li><strong>Asterisk 20.x</strong> - Core PBX engine with PJSIP stack</li>
<li><strong>MySQL 8.0</strong> - Realtime configuration database</li>
<li><strong>WebRTC</strong> - Browser-based calling (DTLS-SRTP encryption)</li>
<li><strong>WSS (Secure WebSockets)</strong> - Encrypted signaling on port 8089</li>
<li><strong>Laravel 11</strong> - Admin portal for provisioning and management</li>
<li><strong>Let's Encrypt</strong> - Automated SSL certificate management</li>
<li><strong>Kamailio</strong> - SIP proxy for load balancing (multi-server setup)</li>
</ul>
<h3>Key Features Implemented</h3>
<div class="bg-gray-800 p-4 rounded-lg my-4">
<h4 class="text-green-400 mb-2">✅ Real-Time Configuration</h4>
<p>All SIP endpoints, authentication, and routing stored in MySQL. Changes reflect instantly—no asterisk reloads needed.</p>
</div>
<div class="bg-gray-800 p-4 rounded-lg my-4">
<h4 class="text-blue-400 mb-2">✅ WebRTC Softphone Integration</h4>
<p>Browser-based calling using JsSIP library. Users log in to web portal and make calls directly—no downloads required.</p>
</div>
<div class="bg-gray-800 p-4 rounded-lg my-4">
<h4 class="text-purple-400 mb-2">✅ Multi-Tenant Architecture</h4>
<p>Isolated contexts per client with dedicated DIDs, extensions, and routing rules. Single server infrastructure, multiple organizations.</p>
</div>
<div class="bg-gray-800 p-4 rounded-lg my-4">
<h4 class="text-yellow-400 mb-2">✅ Advanced Call Routing</h4>
<p>Time-based routing, IVR menus, queue management, voicemail-to-email, and automatic call distribution.</p>
</div>
<h2>🔧 Technical Challenges Solved</h2>
<div class="border-l-4 border-yellow-500 pl-4 my-4">
<h4 class="font-bold">NAT Traversal for WebRTC</h4>
<p><strong>Challenge:</strong> WebRTC clients behind different NAT types couldn't establish media connections.</p>
<p><strong>Solution:</strong> Configured STUN/TURN servers (coturn), implemented ICE candidate gathering, and properly set external_media_address in Asterisk.</p>
</div>
<div class="border-l-4 border-yellow-500 pl-4 my-4">
<h4 class="font-bold">SSL Certificate Management</h4>
<p><strong>Challenge:</strong> WebRTC requires HTTPS/WSS. Managing certificates for multiple client domains was complex.</p>
<p><strong>Solution:</strong> Automated Let's Encrypt integration with wildcard certificates and cron-based auto-renewal. Built certificate deployment system in Laravel.</p>
</div>
<div class="border-l-4 border-yellow-500 pl-4 my-4">
<h4 class="font-bold">Database Connection Pooling</h4>
<p><strong>Challenge:</strong> High call volume caused MySQL connection exhaustion.</p>
<p><strong>Solution:</strong> Implemented connection pooling in Asterisk res_odbc, optimized queries with proper indexes, and added read replicas for scalability.</p>
</div>
<h2>📊 Performance Metrics</h2>
<div class="grid grid-cols-2 md:grid-cols-4 gap-4 my-4">
<div class="bg-gray-800 p-4 rounded text-center">
<div class="text-3xl font-bold text-green-400">500+</div>
<div class="text-sm">Concurrent Calls</div>
</div>
<div class="bg-gray-800 p-4 rounded text-center">
<div class="text-3xl font-bold text-blue-400"><100ms</div>
<div class="text-sm">Call Setup Time</div>
</div>
<div class="bg-gray-800 p-4 rounded text-center">
<div class="text-3xl font-bold text-purple-400">99.9%</div>
<div class="text-sm">Uptime SLA</div>
</div>
<div class="bg-gray-800 p-4 rounded text-center">
<div class="text-3xl font-bold text-yellow-400">2000+</div>
<div class="text-sm">Registered Users</div>
</div>
</div>
<h2>💡 Innovations</h2>
<ul>
<li><strong>API-First Design:</strong> RESTful API for programmatic provisioning—integrated with CRM systems</li>
<li><strong>Real-Time Dashboard:</strong> Live call monitoring via AMI + WebSockets showing active calls, queue stats, agent status</li>
<li><strong>Automated Backup:</strong> Hourly database snapshots with point-in-time recovery capability</li>
<li><strong>CDR Analytics:</strong> Call detail records processed into business intelligence dashboards</li>
<li><strong>Emergency Failover:</strong> Automated detection and routing to backup server in <30 seconds</li>
</ul>
<h2>🚀 Results</h2>
<ul>
<li>✅ Deployed to <strong>15+ organizations</strong> across healthcare, finance, and e-commerce</li>
<li>✅ Handling <strong>50,000+ calls/month</strong> with zero-downtime maintenance</li>
<li>✅ Reduced client telecommunications costs by <strong>60-70%</strong> vs traditional PBX</li>
<li>✅ Enabled <strong>remote work</strong> during pandemic with browser-based calling</li>
<li>✅ Integrated with <strong>CRM systems</strong> (Salesforce, HubSpot) for click-to-dial</li>
</ul>
<h2>🔗 Related Content</h2>
<p>Read the full technical deep-dive: <a href="/blog/building-realtime-asterisk-pbx-mysql-webrtc" class="text-blue-400 hover:underline">Building Realtime Asterisk PBX with MySQL and WebRTC</a></p>
</div>
</div>