I specialize in VoIP, SIP, and PBX calling solutions for Web, Desktop, and Mobile platforms, with hands-on experience in Asterisk, FreePBX and Ozeki etc... I can help you build, integrate, customize, and troubleshoot reliable calling systems, whether you need a complete VoIP solution or integration with your existing infrastructure. My expertise includes: -VoIP & SIP Calling Development -Asterisk PBX Setup & Customization -Ozeki VoIP/SIP Solutions -SIP Trunk & Extension Configuration -WebRTC Browser-Based Calling -Web, Desktop & Mobile Softphone Development -Inbound & Outbound Calling -IVR, Call Queues & Call Routing -Call Recording & Call History -DTMF, Call Transfer, Hold & Conference Calling -Click-to-Call & Call Center Solutions SIP/WebSocket/WebRTC Integration -VoIP API & Third-Party Integrations -Custom VoIP Dashboards and Admin Panels Tech Stack: ASP.NET | .NET Core | REST API | C# | React.js | Angular | SQL Server | PostgreSQL | MySQL | MongoDB | Asterisk | Ozeki | SIP | WebRTC Whether you're building a call center, business phone system, CRM calling feature, softphone, customer-support platform, or custom VoIP application, I can help turn your requirements into a working solution