Custom Browser-Based VoIP System Development

I'm seeking an experienced developer to build a custom browser-based VoIP calling system using WebRTC (JsSIP/SIP.js) and either Asterisk or FreeSWITCH as the backend.

Key Features:

- User login system (Admin & Clients)
- Browser-based dialer for making/receiving calls
- Call logs, recordings, and agent status
- Connect with SIP trunk (Asterisk or FreeSWITCH)
- Responsive web UI (React, Vue, or clean HTML/PHP is acceptable)
- Basic IVR routing and payment/billing system

Ideal Skills and Experience:

- Proficiency in WebRTC, SIP, Asterisk, or FreeSWITCH
- Experience building VoIP dashboards
- Strong frontend development skills for responsive UIs

Please apply only if you’ve worked with WebRTC SIP, Asterisk, or have built VoIP dashboards before. Include past work or a demo if available.